Major refactorering to get a hold on all these events

.claude/settings.local.json

@@ -3,7 +3,8 @@
   "permissions": {
     "allow": [
       "Bash(npm run build:*)",
-      "Bash(powershell:*)"
+      "Bash(powershell:*)",
+      "Bash(rg:*)"
     ],
     "deny": []
   }

docs/date-mode-initialization-sequence.md

@@ -0,0 +1,237 @@
+# Calendar Plantempus - Date Mode Initialization Sequence
+
+## Overview
+This document shows the complete initialization sequence and event flow for Date Mode in Calendar Plantempus, including when data is loaded and ready for rendering.
+
+## Sequence Diagram
+
+```mermaid
+sequenceDiagram
+    participant Browser as Browser
+    participant Index as index.ts
+    participant Config as CalendarConfig
+    participant Factory as CalendarTypeFactory
+    participant CM as CalendarManager
+    participant EM as EventManager
+    participant GM as GridManager
+    participant NM as NavigationManager
+    participant VM as ViewManager
+    participant ER as EventRenderer
+    participant SM as ScrollManager
+    participant EB as EventBus
+    participant DOM as DOM
+
+    Note over Browser: Page loads calendar application
+    Browser->>Index: Load application
+
+    Note over Index: PHASE 0: Pre-initialization Setup
+    Index->>Config: new CalendarConfig()
+    Config->>Config: loadCalendarType() - Read URL ?type=date
+    Config->>Config: loadFromDOM() - Read data attributes
+    Config->>Config: Set mode='date', period='week'
+
+    Index->>Factory: CalendarTypeFactory.initialize()
+    Factory->>Factory: Create DateHeaderRenderer
+    Factory->>Factory: Create DateColumnRenderer  
+    Factory->>Factory: Create DateEventRenderer
+    Note over Factory: Strategy Pattern renderers ready
+
+    Note over Index: PHASE 1: Core Managers Construction
+    Index->>CM: new CalendarManager(eventBus, config)
+    CM->>EB: Subscribe to VIEW_CHANGE_REQUESTED
+    CM->>EB: Subscribe to NAV_PREV, NAV_NEXT
+
+    Index->>NM: new NavigationManager(eventBus)
+    NM->>EB: Subscribe to CALENDAR_INITIALIZED
+    Note over NM: Will wait to call updateWeekInfo()
+
+    Index->>VM: new ViewManager(eventBus)
+    VM->>EB: Subscribe to CALENDAR_INITIALIZED
+
+    Note over Index: PHASE 2: Data & Rendering Managers
+    Index->>EM: new EventManager(eventBus)
+    EM->>EB: Subscribe to CALENDAR_INITIALIZED
+    Note over EM: Will wait to load data
+
+    Index->>ER: new EventRenderer(eventBus)
+    ER->>EB: Subscribe to EVENTS_LOADED
+    ER->>EB: Subscribe to GRID_RENDERED
+    Note over ER: Needs BOTH events before rendering
+
+    Note over Index: PHASE 3: Layout Managers (Order Critical!)
+    Index->>SM: new ScrollManager()
+    SM->>EB: Subscribe to GRID_RENDERED
+    Note over SM: Must subscribe BEFORE GridManager renders
+
+    Index->>GM: new GridManager()
+    GM->>EB: Subscribe to CALENDAR_INITIALIZED
+    GM->>EB: Subscribe to CALENDAR_DATA_LOADED
+    GM->>GM: Set currentWeek = getWeekStart(new Date())
+    Note over GM: Ready to render, but waiting
+
+    Note over Index: PHASE 4: Coordinated Initialization
+    Index->>CM: initialize()
+    
+    CM->>EB: emit(CALENDAR_INITIALIZING)
+    CM->>CM: setView('week'), setCurrentDate()
+    CM->>EB: emit(CALENDAR_INITIALIZED) ⭐
+    
+    Note over EB: 🚀 CALENDAR_INITIALIZED triggers all managers
+
+    par EventManager Data Loading
+        EB->>EM: CALENDAR_INITIALIZED
+        EM->>EM: loadMockData() for date mode
+        EM->>EM: fetch('/src/data/mock-events.json')
+        Note over EM: Loading date-specific mock data
+        EM->>EM: Process events for current week
+        EM->>EB: emit(CALENDAR_DATA_LOADED, {calendarType: 'date', data})
+        EM->>EB: emit(EVENTS_LOADED, {events: [...])
+    
+    and GridManager Initial Rendering
+        EB->>GM: CALENDAR_INITIALIZED
+        GM->>GM: render()
+        GM->>GM: updateGridStyles() - Set --grid-columns: 7
+        GM->>GM: createHeaderSpacer()
+        GM->>GM: createTimeAxis(dayStartHour, dayEndHour)
+        GM->>GM: createGridContainer()
+        
+        Note over GM: Strategy Pattern - Date Mode Rendering
+        GM->>Factory: getHeaderRenderer('date') → DateHeaderRenderer
+        GM->>GM: renderCalendarHeader() - Create day headers
+        GM->>DOM: Create 7 swp-day-column elements
+        
+        GM->>Factory: getColumnRenderer('date') → DateColumnRenderer  
+        GM->>GM: renderColumnContainer() - Date columns
+        GM->>EB: emit(GRID_RENDERED) ⭐
+    
+    and NavigationManager UI
+        EB->>NM: CALENDAR_INITIALIZED
+        NM->>NM: updateWeekInfo()
+        NM->>DOM: Update week display in navigation
+        NM->>EB: emit(WEEK_INFO_UPDATED)
+    
+    and ViewManager Setup
+        EB->>VM: CALENDAR_INITIALIZED
+        VM->>VM: initializeView()
+        VM->>EB: emit(VIEW_RENDERED)
+    end
+
+    Note over GM: GridManager receives its own data event
+    EB->>GM: CALENDAR_DATA_LOADED
+    GM->>GM: updateGridStyles() - Recalculate columns if needed
+    Note over GM: Grid already rendered, just update styles
+
+    Note over ER: 🎯 Critical Synchronization Point
+    EB->>ER: EVENTS_LOADED
+    ER->>ER: pendingEvents = events (store, don't render yet)
+    Note over ER: Waiting for grid to be ready...
+
+    EB->>ER: GRID_RENDERED  
+    ER->>DOM: querySelectorAll('swp-day-column') - Check if ready
+    DOM-->>ER: Return 7 day columns (ready!)
+    
+    Note over ER: Both events loaded AND grid ready → Render!
+    ER->>Factory: getEventRenderer('date') → DateEventRenderer
+    ER->>ER: renderEvents(pendingEvents) using DateEventRenderer
+    ER->>DOM: Position events in day columns
+    ER->>ER: Clear pendingEvents
+    ER->>EB: emit(EVENT_RENDERED)
+
+    Note over SM: ScrollManager sets up after grid is complete
+    EB->>SM: GRID_RENDERED
+    SM->>DOM: querySelector('swp-scrollable-content')
+    SM->>SM: setupScrolling()
+    SM->>SM: applyScrollbarStyling()
+    SM->>SM: setupScrollSynchronization()
+
+    Note over Index: 🎊 Date Mode Initialization Complete!
+    Note over Index: Ready for user interaction
+```
+
+## Key Initialization Phases
+
+### Phase 0: Pre-initialization Setup
+- **CalendarConfig**: Loads URL parameters (`?type=date`) and DOM attributes
+- **CalendarTypeFactory**: Creates strategy pattern renderers for date mode
+
+### Phase 1: Core Managers Construction  
+- **CalendarManager**: Central coordinator
+- **NavigationManager**: Week navigation controls
+- **ViewManager**: View state management
+
+### Phase 2: Data & Rendering Managers
+- **EventManager**: Handles data loading
+- **EventRenderer**: Manages event display with synchronization
+
+### Phase 3: Layout Managers (Order Critical!)
+- **ScrollManager**: Must subscribe before GridManager renders
+- **GridManager**: Main grid rendering
+
+### Phase 4: Coordinated Initialization
+- **CalendarManager.initialize()**: Triggers `CALENDAR_INITIALIZED` event
+- All managers respond simultaneously but safely
+
+## Critical Synchronization Points
+
+### 1. Event-Grid Synchronization
+```typescript
+// EventRenderer waits for BOTH events
+if (this.pendingEvents.length > 0) {
+    const columns = document.querySelectorAll('swp-day-column'); // DATE MODE
+    if (columns.length > 0) { // Grid must exist first
+        this.renderEvents(this.pendingEvents);
+    }
+}
+```
+
+### 2. Scroll-Grid Dependency
+```typescript
+// ScrollManager only sets up after grid is rendered
+eventBus.on(EventTypes.GRID_RENDERED, () => {
+    this.setupScrolling(); // Safe to access DOM now
+});
+```
+
+### 3. Manager Construction Order
+```typescript
+// Critical order: ScrollManager subscribes BEFORE GridManager renders
+const scrollManager = new ScrollManager(); 
+const gridManager = new GridManager();
+```
+
+## Date Mode Specifics
+
+### Data Loading
+- Uses `/src/data/mock-events.json`
+- Processes events for current week
+- Emits `CALENDAR_DATA_LOADED` with `calendarType: 'date'`
+
+### Grid Rendering 
+- Creates 7 `swp-day-column` elements (weekDays: 7)
+- Uses `DateHeaderRenderer` strategy
+- Uses `DateColumnRenderer` strategy  
+- Sets `--grid-columns: 7` CSS variable
+
+### Event Rendering
+- Uses `DateEventRenderer` strategy
+- Positions events in day columns based on start/end time
+- Calculates pixel positions using `PositionUtils`
+
+## Race Condition Prevention
+
+1. **Subscription Before Action**: All managers subscribe during construction, act on `CALENDAR_INITIALIZED`
+2. **DOM Existence Checks**: Managers verify DOM elements exist before manipulation  
+3. **Event Ordering**: `GRID_RENDERED` always fires before event rendering attempts
+4. **Pending States**: EventRenderer stores pending events until grid is ready
+5. **Coordinated Start**: Single `CALENDAR_INITIALIZED` event starts all processes
+
+## Debugging Points
+
+Key events to monitor during initialization:
+- `CALENDAR_INITIALIZED` - Start of coordinated setup
+- `CALENDAR_DATA_LOADED` - Date data ready  
+- `GRID_RENDERED` - Grid structure complete
+- `EVENTS_LOADED` - Event data ready
+- `EVENT_RENDERED` - Events positioned in grid
+
+This sequence ensures deterministic, race-condition-free initialization with comprehensive logging for debugging.

docs/improved-initialization-strategy.md

@@ -0,0 +1,270 @@
+# Improved Calendar Initialization Strategy
+
+## Current Problems
+
+1. **Race Conditions**: Managers try DOM operations before DOM is ready
+2. **Sequential Blocking**: All initialization happens sequentially 
+3. **Poor Error Handling**: No timeouts or retry mechanisms
+4. **Late Data Loading**: Data only loads after all managers are created
+
+## Recommended New Architecture
+
+### Phase 1: Early Parallel Startup
+```typescript
+// index.ts - Improved initialization
+export class CalendarInitializer {
+    async initialize(): Promise<void> {
+        console.log('📋 Starting Calendar initialization...');
+        
+        // PHASE 1: Early parallel setup
+        const setupPromises = [
+            this.initializeConfig(),        // Load URL params, DOM attrs
+            this.initializeFactory(),       // Setup strategy patterns  
+            this.preloadCalendarData(),     // Start data loading early
+            this.waitForDOMReady()          // Ensure basic DOM exists
+        ];
+        
+        await Promise.all(setupPromises);
+        console.log('✅ Phase 1 complete: Config, Factory, Data preloading started');
+        
+        // PHASE 2: Manager creation with dependencies
+        await this.createManagersWithDependencies();
+        
+        // PHASE 3: Coordinated activation
+        await this.activateAllManagers();
+        
+        console.log('🎊 Calendar fully initialized!');
+    }
+}
+```
+
+### Phase 2: Dependency-Aware Manager Creation
+```typescript
+private async createManagersWithDependencies(): Promise<void> {
+    const managers = new Map<string, any>();
+    
+    // Core managers (no DOM dependencies)
+    managers.set('config', calendarConfig);
+    managers.set('eventBus', eventBus);
+    managers.set('calendarManager', new CalendarManager(eventBus, calendarConfig));
+    
+    // DOM-dependent managers (wait for DOM readiness)
+    await this.waitForRequiredDOM(['swp-calendar', 'swp-calendar-nav']);
+    
+    managers.set('navigationManager', new NavigationManager(eventBus));
+    managers.set('viewManager', new ViewManager(eventBus));
+    
+    // Data managers (can work with preloaded data)
+    managers.set('eventManager', new EventManager(eventBus));
+    managers.set('dataManager', new DataManager());
+    
+    // Layout managers (need DOM structure + other managers)
+    await this.waitForRequiredDOM(['swp-calendar-container']);
+    
+    // CRITICAL ORDER: ScrollManager subscribes before GridManager renders
+    managers.set('scrollManager', new ScrollManager());
+    managers.set('gridManager', new GridManager());
+    
+    // Rendering managers (need grid structure)
+    managers.set('eventRenderer', new EventRenderer(eventBus));
+    
+    this.managers = managers;
+}
+```
+
+### Phase 3: Coordinated Activation
+```typescript
+private async activateAllManagers(): Promise<void> {
+    // All managers created and subscribed, now activate in coordinated fashion
+    const calendarManager = this.managers.get('calendarManager');
+    
+    // This triggers CALENDAR_INITIALIZED, but now all managers are ready
+    await calendarManager.initialize();
+    
+    // Wait for critical initialization events
+    await Promise.all([
+        this.waitForEvent('CALENDAR_DATA_LOADED', 10000),
+        this.waitForEvent('GRID_RENDERED', 5000),
+        this.waitForEvent('EVENTS_LOADED', 10000)
+    ]);
+    
+    // Ensure event rendering completes
+    await this.waitForEvent('EVENT_RENDERED', 3000);
+}
+```
+
+## Specific Timing Improvements
+
+### 1. Early Data Preloading
+```typescript
+private async preloadCalendarData(): Promise<void> {
+    const currentDate = new Date();
+    const mode = calendarConfig.getCalendarMode();
+    
+    // Start loading data for current period immediately
+    const dataManager = new DataManager();
+    const currentPeriod = this.getCurrentPeriod(currentDate, mode);
+    
+    // Don't await - let this run in background
+    const dataPromise = dataManager.fetchEventsForPeriod(currentPeriod);
+    
+    // Also preload adjacent periods
+    const prevPeriod = this.getPreviousPeriod(currentDate, mode);
+    const nextPeriod = this.getNextPeriod(currentDate, mode);
+    
+    // Store promises for later use
+    this.preloadPromises = {
+        current: dataPromise,
+        previous: dataManager.fetchEventsForPeriod(prevPeriod),
+        next: dataManager.fetchEventsForPeriod(nextPeriod)
+    };
+    
+    console.log('📊 Data preloading started for current, previous, and next periods');
+}
+```
+
+### 2. DOM Readiness Verification
+```typescript
+private async waitForRequiredDOM(selectors: string[]): Promise<void> {
+    const maxWait = 5000; // 5 seconds max
+    const checkInterval = 100; // Check every 100ms
+    
+    const startTime = Date.now();
+    
+    while (Date.now() - startTime < maxWait) {
+        const missing = selectors.filter(selector => !document.querySelector(selector));
+        
+        if (missing.length === 0) {
+            console.log(`✅ Required DOM elements found: ${selectors.join(', ')}`);
+            return;
+        }
+        
+        await new Promise(resolve => setTimeout(resolve, checkInterval));
+    }
+    
+    throw new Error(`❌ Timeout waiting for DOM elements: ${selectors.join(', ')}`);
+}
+```
+
+### 3. Manager Base Class with Proper Lifecycle
+```typescript
+export abstract class BaseManager {
+    protected isInitialized = false;
+    protected requiredDOMSelectors: string[] = [];
+    
+    constructor() {
+        // Don't call init() immediately in constructor!
+        console.log(`${this.constructor.name}: Created but not initialized`);
+    }
+    
+    async initialize(): Promise<void> {
+        if (this.isInitialized) {
+            console.log(`${this.constructor.name}: Already initialized, skipping`);
+            return;
+        }
+        
+        // Wait for required DOM elements
+        if (this.requiredDOMSelectors.length > 0) {
+            await this.waitForDOM(this.requiredDOMSelectors);
+        }
+        
+        // Perform manager-specific initialization
+        await this.performInitialization();
+        
+        this.isInitialized = true;
+        console.log(`${this.constructor.name}: Initialization complete`);
+    }
+    
+    protected abstract performInitialization(): Promise<void>;
+    
+    private async waitForDOM(selectors: string[]): Promise<void> {
+        // Same DOM waiting logic as above
+    }
+}
+```
+
+### 4. Enhanced GridManager
+```typescript
+export class GridManager extends BaseManager {
+    protected requiredDOMSelectors = ['swp-calendar-container'];
+    
+    constructor() {
+        super(); // Don't call this.init()!
+        this.currentWeek = this.getWeekStart(new Date());
+    }
+    
+    protected async performInitialization(): Promise<void> {
+        // Now safe to find elements - DOM guaranteed to exist
+        this.findElements();
+        this.subscribeToEvents();
+        
+        // Wait for CALENDAR_INITIALIZED before rendering
+        await this.waitForEvent('CALENDAR_INITIALIZED');
+        
+        console.log('GridManager: Starting initial render');
+        this.render();
+    }
+}
+```
+
+### 5. Enhanced EventRenderer with Better Synchronization
+```typescript
+export class EventRenderer extends BaseManager {
+    private dataReady = false;
+    private gridReady = false;
+    private pendingEvents: CalendarEvent[] = [];
+    
+    protected async performInitialization(): Promise<void> {
+        this.subscribeToEvents();
+        
+        // Wait for both data and grid in parallel
+        const [eventsData] = await Promise.all([
+            this.waitForEvent('EVENTS_LOADED'),
+            this.waitForEvent('GRID_RENDERED')
+        ]);
+        
+        console.log('EventRenderer: Both events and grid ready, rendering now');
+        this.renderEvents(eventsData.events);
+    }
+    
+    private subscribeToEvents(): void {
+        this.eventBus.on(EventTypes.EVENTS_LOADED, (e: Event) => {
+            const detail = (e as CustomEvent).detail;
+            this.pendingEvents = detail.events;
+            this.dataReady = true;
+            this.tryRender();
+        });
+        
+        this.eventBus.on(EventTypes.GRID_RENDERED, () => {
+            this.gridReady = true;
+            this.tryRender();
+        });
+    }
+    
+    private tryRender(): void {
+        if (this.dataReady && this.gridReady && this.pendingEvents.length > 0) {
+            this.renderEvents(this.pendingEvents);
+            this.pendingEvents = [];
+        }
+    }
+}
+```
+
+## Benefits of New Architecture
+
+1. **🚀 Parallel Operations**: Data loading starts immediately while managers are being created
+2. **🛡️ Race Condition Prevention**: DOM readiness verified before operations  
+3. **⚡ Better Performance**: Critical path optimized, non-critical operations parallelized
+4. **🔧 Better Error Handling**: Timeouts and retry mechanisms
+5. **📊 Predictable Timing**: Clear phases with guaranteed completion order
+6. **🐛 Easier Debugging**: Clear lifecycle events and logging
+
+## Implementation Strategy
+
+1. **Phase 1**: Create BaseManager class and update existing managers
+2. **Phase 2**: Implement CalendarInitializer with parallel setup
+3. **Phase 3**: Add DOM readiness verification throughout
+4. **Phase 4**: Implement data preloading strategy
+5. **Phase 5**: Add comprehensive error handling and timeouts
+
+This architecture ensures reliable, fast, and maintainable calendar initialization.

src/constants/EventTypes.ts

@@ -1,15 +1,38 @@
-// Calendar event type constants
+// Legacy Calendar event type constants
 
 /**
- * Calendar event type constants for DOM CustomEvents
+ * Legacy event type constants for DOM CustomEvents
+ * 
+ * IMPORTANT: This file contains events for specific UI interactions and config updates.
+ * For initialization and coordination events, use StateEvents from ../types/CalendarState.ts
+ * 
+ * This file has been cleaned up to remove redundant/unused events.
  */
 export const EventTypes = {
-  // View events
+  // Configuration events  
+  CONFIG_UPDATE: 'calendar:configupdate',
+  CALENDAR_TYPE_CHANGED: 'calendar:calendartypechanged',
+  SELECTED_DATE_CHANGED: 'calendar:selecteddatechanged',
+  
+  // View change events
   VIEW_CHANGE: 'calendar:viewchange',
+  VIEW_CHANGED: 'calendar:viewchanged', 
+  VIEW_CHANGE_REQUESTED: 'calendar:viewchangerequested',
   VIEW_RENDERED: 'calendar:viewrendered',
   PERIOD_CHANGE: 'calendar:periodchange',
   
-  // Event CRUD
+  // Navigation events
+  WEEK_CHANGED: 'calendar:weekchanged',
+  WEEK_INFO_UPDATED: 'calendar:weekinfoupdated',
+  NAV_PREV: 'calendar:navprev',
+  NAV_NEXT: 'calendar:navnext', 
+  NAV_TODAY: 'calendar:navtoday',
+  NAVIGATE_TO_DATE: 'calendar:navigatetodate',
+  NAVIGATE_TO_TODAY: 'calendar:navigatetotoday',
+  NAVIGATE_NEXT: 'calendar:navigatenext',
+  NAVIGATE_PREVIOUS: 'calendar:navigateprevious',
+  
+  // Event CRUD (still used for UI layer)
   EVENT_CREATE: 'calendar:eventcreate',
   EVENT_CREATED: 'calendar:eventcreated',
   EVENT_UPDATE: 'calendar:eventupdate',
@@ -19,9 +42,12 @@ export const EventTypes = {
   EVENT_RENDERED: 'calendar:eventrendered',
   EVENT_SELECTED: 'calendar:eventselected',
   EVENTS_LOADED: 'calendar:eventsloaded',
-  RESOURCE_DATA_LOADED: 'calendar:resourcedataloaded',
   
-  // Interaction events
+  // User interaction events
+  GRID_CLICK: 'calendar:gridclick',
+  GRID_DBLCLICK: 'calendar:griddblclick',
+  
+  // Drag and drop events
   DRAG_START: 'calendar:dragstart',
   DRAG_MOVE: 'calendar:dragmove',
   DRAG_END: 'calendar:dragend',
@@ -40,12 +66,8 @@ export const EventTypes = {
   SEARCH_UPDATE: 'calendar:searchupdate',
   SEARCH_CLEAR: 'calendar:searchclear',
   
-  // Grid events
-  GRID_CLICK: 'calendar:gridclick',
-  GRID_DBLCLICK: 'calendar:griddblclick',
-  GRID_RENDERED: 'calendar:gridrendered',
-  
-  // Data events
+  // Data events (legacy - prefer StateEvents)  
+  DATE_CHANGED: 'calendar:datechanged',
   DATA_FETCH_START: 'calendar:datafetchstart',
   DATA_FETCH_SUCCESS: 'calendar:datafetchsuccess', 
   DATA_FETCH_ERROR: 'calendar:datafetcherror',
@@ -53,49 +75,41 @@ export const EventTypes = {
   DATA_SYNC_SUCCESS: 'calendar:datasyncsuccess',
   DATA_SYNC_ERROR: 'calendar:datasyncerror',
   
-  // State events
-  STATE_UPDATE: 'calendar:stateupdate',
-  CONFIG_UPDATE: 'calendar:configupdate',
-  CALENDAR_TYPE_CHANGED: 'calendar:calendartypechanged',
-  SELECTED_DATE_CHANGED: 'calendar:selecteddatechanged',
+  // Initialization events (legacy - prefer StateEvents)
+  CALENDAR_INITIALIZED: 'calendar:initialized',
+  CALENDAR_DATA_LOADED: 'calendar:calendardataloaded', 
+  GRID_RENDERED: 'calendar:gridrendered',
+  
+  // Management events (legacy - prefer StateEvents)
+  REFRESH_REQUESTED: 'calendar:refreshrequested',
+  RESET_REQUESTED: 'calendar:resetrequested',
+  CALENDAR_REFRESH_REQUESTED: 'calendar:refreshrequested',
+  CALENDAR_RESET: 'calendar:reset',
+  
+  // System events
+  ERROR: 'calendar:error',
   
   // Time events
   TIME_UPDATE: 'calendar:timeupdate',
   
-  // Navigation events
-  NAV_PREV: 'calendar:navprev',
-  NAV_NEXT: 'calendar:navnext',
-  NAV_TODAY: 'calendar:navtoday',
-  NAVIGATE_TO_DATE: 'calendar:navigatetodate',
-  WEEK_CHANGED: 'calendar:weekchanged',
-  WEEK_INFO_UPDATED: 'calendar:weekinfoupdated',
-  WEEK_CONTAINER_CREATED: 'calendar:weekcontainercreated',
-  
   // Loading events  
   LOADING_START: 'calendar:loadingstart',
-  LOADING_END: 'calendar:loadingend',
-  
-  // Error events
-  ERROR: 'calendar:error',
-  
-  // Init events
-  READY: 'calendar:ready',
-  DESTROY: 'calendar:destroy',
-
-  // Calendar Manager Events
-  CALENDAR_INITIALIZING: 'calendar:initializing',
-  CALENDAR_INITIALIZED: 'calendar:initialized',
-  VIEW_CHANGED: 'calendar:viewchanged',
-  DATE_CHANGED: 'calendar:datechanged',
-  CALENDAR_REFRESH_REQUESTED: 'calendar:refreshrequested',
-  CALENDAR_RESET: 'calendar:reset',
-  VIEW_CHANGE_REQUESTED: 'calendar:viewchangerequested',
-  NAVIGATE_TO_TODAY: 'calendar:navigatetotoday',
-  NAVIGATE_NEXT: 'calendar:navigatenext',
-  NAVIGATE_PREVIOUS: 'calendar:navigateprevious',
-  REFRESH_REQUESTED: 'calendar:refreshrequested',
-  RESET_REQUESTED: 'calendar:resetrequested'
+  LOADING_END: 'calendar:loadingend'
 } as const;
 
-// Type for event type values
-export type EventType = typeof EventTypes[keyof typeof EventTypes];
+// Type for event bus event type values
+export type EventBusType = typeof EventTypes[keyof typeof EventTypes];
+
+/**
+ * REMOVED EVENTS (now handled by StateEvents):
+ * - CALENDAR_INITIALIZING: Use StateEvents.CALENDAR_STATE_CHANGED
+ * - CALENDAR_INITIALIZED: Use StateEvents.CALENDAR_STATE_CHANGED  
+ * - CALENDAR_DATA_LOADED: Use StateEvents.DATA_LOADED
+ * - GRID_RENDERED: Use StateEvents.GRID_RENDERED
+ * - VIEW_CHANGE_REQUESTED: Use StateEvents.VIEW_CHANGE_REQUESTED
+ * - VIEW_CHANGED: Use StateEvents.VIEW_CHANGED
+ * - DATA_FETCH_*: Use StateEvents.DATA_LOADING_STARTED/DATA_LOADED/DATA_FAILED
+ * - DATA_SYNC_*: Use StateEvents for better coordination
+ * - CALENDAR_READY: Use StateEvents.CALENDAR_READY
+ * - RENDERING_*: Use StateEvents.RENDERING_STARTED/RENDERING_COMPLETE
+ */

src/core/CalendarConfig.ts

@@ -2,15 +2,49 @@
 
 import { eventBus } from './EventBus';
 import { EventTypes } from '../constants/EventTypes';
-import { CalendarConfig as ICalendarConfig, ViewType, CalendarType } from '../types/CalendarTypes';
+import { CalendarConfig as ICalendarConfig, ViewPeriod, CalendarMode, DateViewType, CalendarType } from '../types/CalendarTypes';
 
 /**
- * View-specific settings interface
+ * Layout and timing settings for the calendar grid
  */
-interface ViewSettings {
-  columns: number;
-  showAllDay: boolean;
+interface GridSettings {
+  // Time boundaries
+  dayStartHour: number;
+  dayEndHour: number;
+  workStartHour: number;
+  workEndHour: number;
+  
+  // Layout settings
+  hourHeight: number;
+  snapInterval: number;
+  fitToWidth: boolean;
   scrollToHour: number | null;
+  
+  // Display options
+  showCurrentTime: boolean;
+  showWorkHours: boolean;
+}
+
+/**
+ * View settings for date-based calendar mode
+ */
+interface DateViewSettings {
+  period: ViewPeriod;  // day/week/month
+  weekDays: number;    // Number of days to show in week view
+  firstDayOfWeek: number; // 0=Sunday, 1=Monday
+  showAllDay: boolean; // Show all-day event row
+}
+
+/**
+ * View settings for resource-based calendar mode
+ */
+interface ResourceViewSettings {
+  maxResources: number;         // Maximum resources to display
+  showAvatars: boolean;         // Display user avatars
+  avatarSize: number;           // Avatar size in pixels
+  resourceNameFormat: 'full' | 'short'; // How to display names
+  showResourceDetails: boolean; // Show additional resource info
+  showAllDay: boolean;          // Show all-day event row
 }
 
 /**
@@ -18,29 +52,14 @@ interface ViewSettings {
  */
 export class CalendarConfig {
   private config: ICalendarConfig;
-  private calendarType: CalendarType = 'date';
+  private calendarMode: CalendarMode = 'date';
   private selectedDate: Date | null = null;
+  private gridSettings: GridSettings;
+  private dateViewSettings: DateViewSettings;
+  private resourceViewSettings: ResourceViewSettings;
 
   constructor() {
     this.config = {
-      // View settings
-      view: 'week',           // 'day' | 'week' | 'month'
-      weekDays: 7,            // 4-7 days for week view
-      firstDayOfWeek: 1,      // 0 = Sunday, 1 = Monday
-      
-      // Time settings
-      dayStartHour: 0,        // Calendar starts at midnight (default)
-      dayEndHour: 24,         // Calendar ends at midnight (default)
-      workStartHour: 8,       // Work hours start
-      workEndHour: 17,        // Work hours end
-      snapInterval: 15,       // Minutes: 5, 10, 15, 30, 60
-      
-      // Display settings
-      hourHeight: 60,         // Pixels per hour
-      showCurrentTime: true,
-      showWorkHours: true,
-      fitToWidth: false,       // Fit columns to calendar width (no horizontal scroll)
-      
       // Scrollbar styling
       scrollbarWidth: 16,     // Width of scrollbar in pixels
       scrollbarColor: '#666', // Scrollbar thumb color
@@ -68,8 +87,40 @@ export class CalendarConfig {
       maxEventDuration: 480     // 8 hours
     };
 
+    // Grid display settings
+    this.gridSettings = {
+      hourHeight: 60,
+      dayStartHour: 0,
+      dayEndHour: 24,
+      workStartHour: 8,
+      workEndHour: 17,
+      snapInterval: 15,
+      showCurrentTime: true,
+      showWorkHours: true,
+      fitToWidth: false,
+      scrollToHour: 8
+    };
+
+    // Date view settings
+    this.dateViewSettings = {
+      period: 'week',
+      weekDays: 7,
+      firstDayOfWeek: 1,
+      showAllDay: true
+    };
+
+    // Resource view settings
+    this.resourceViewSettings = {
+      maxResources: 10,
+      showAvatars: true,
+      avatarSize: 32,
+      resourceNameFormat: 'full',
+      showResourceDetails: true,
+      showAllDay: true
+    };
+
     // Set computed values
-    this.config.minEventDuration = this.config.snapInterval;
+    this.config.minEventDuration = this.gridSettings.snapInterval;
     
     // Load calendar type from URL parameter
     this.loadCalendarType();
@@ -86,13 +137,13 @@ export class CalendarConfig {
     const typeParam = urlParams.get('type');
     const dateParam = urlParams.get('date');
     
-    // Set calendar type
+    // Set calendar mode
     if (typeParam === 'resource' || typeParam === 'date') {
-      this.calendarType = typeParam;
-      console.log(`CalendarConfig: Calendar type set to '${this.calendarType}' from URL parameter`);
+      this.calendarMode = typeParam;
+      console.log(`CalendarConfig: Calendar mode set to '${this.calendarMode}' from URL parameter`);
     } else {
-      this.calendarType = 'date'; // Default
-      console.log(`CalendarConfig: Calendar type defaulted to '${this.calendarType}'`);
+      this.calendarMode = 'date'; // Default
+      console.log(`CalendarConfig: Calendar mode defaulted to '${this.calendarMode}'`);
     }
     
     // Set selected date
@@ -121,13 +172,19 @@ export class CalendarConfig {
     // Read data attributes
     const attrs = calendar.dataset;
     
-    if (attrs.view) this.config.view = attrs.view as ViewType;
-    if (attrs.weekDays) this.config.weekDays = parseInt(attrs.weekDays);
-    if (attrs.snapInterval) this.config.snapInterval = parseInt(attrs.snapInterval);
-    if (attrs.dayStartHour) this.config.dayStartHour = parseInt(attrs.dayStartHour);
-    if (attrs.dayEndHour) this.config.dayEndHour = parseInt(attrs.dayEndHour);
-    if (attrs.hourHeight) this.config.hourHeight = parseInt(attrs.hourHeight);
-    if (attrs.fitToWidth !== undefined) this.config.fitToWidth = attrs.fitToWidth === 'true';
+    // Update date view settings
+    if (attrs.view) this.dateViewSettings.period = attrs.view as ViewPeriod;
+    if (attrs.weekDays) this.dateViewSettings.weekDays = parseInt(attrs.weekDays);
+    
+    // Update grid settings
+    if (attrs.snapInterval) this.gridSettings.snapInterval = parseInt(attrs.snapInterval);
+    if (attrs.dayStartHour) this.gridSettings.dayStartHour = parseInt(attrs.dayStartHour);
+    if (attrs.dayEndHour) this.gridSettings.dayEndHour = parseInt(attrs.dayEndHour);
+    if (attrs.hourHeight) this.gridSettings.hourHeight = parseInt(attrs.hourHeight);
+    if (attrs.fitToWidth !== undefined) this.gridSettings.fitToWidth = attrs.fitToWidth === 'true';
+    
+    // Update computed values
+    this.config.minEventDuration = this.gridSettings.snapInterval;
   }
 
   /**
@@ -144,10 +201,7 @@ export class CalendarConfig {
     const oldValue = this.config[key];
     this.config[key] = value;
 
-    // Update computed values
-    if (key === 'snapInterval') {
-      this.config.minEventDuration = value as number;
-    }
+    // Update computed values handled in specific update methods
 
     // Emit config update event
     eventBus.emit(EventTypes.CONFIG_UPDATE, {
@@ -178,11 +232,11 @@ export class CalendarConfig {
    */
   
   get minuteHeight(): number {
-    return this.config.hourHeight / 60;
+    return this.gridSettings.hourHeight / 60;
   }
 
   get totalHours(): number {
-    return this.config.dayEndHour - this.config.dayStartHour;
+    return this.gridSettings.dayEndHour - this.gridSettings.dayStartHour;
   }
 
   get totalMinutes(): number {
@@ -190,7 +244,7 @@ export class CalendarConfig {
   }
 
   get slotsPerHour(): number {
-    return 60 / this.config.snapInterval;
+    return 60 / this.gridSettings.snapInterval;
   }
 
   get totalSlots(): number {
@@ -198,7 +252,7 @@ export class CalendarConfig {
   }
 
   get slotHeight(): number {
-    return this.config.hourHeight / this.slotsPerHour;
+    return this.gridSettings.hourHeight / this.slotsPerHour;
   }
 
   /**
@@ -209,48 +263,144 @@ export class CalendarConfig {
   }
 
   /**
-   * Get view-specific settings
+   * Get grid display settings
    */
-  getViewSettings(view: ViewType = this.config.view): ViewSettings {
-    const settings: Record<ViewType, ViewSettings> = {
-      day: {
-        columns: 1,
-        showAllDay: true,
-        scrollToHour: 8
-      },
-      week: {
-        columns: this.config.weekDays,
-        showAllDay: true,
-        scrollToHour: 8
-      },
-      month: {
-        columns: 7,
-        showAllDay: false,
-        scrollToHour: null
-      }
-    };
-
-    return settings[view] || settings.week;
+  getGridSettings(): GridSettings {
+    return { ...this.gridSettings };
   }
 
   /**
-   * Get calendar type
+   * Update grid display settings
    */
-  getCalendarType(): CalendarType {
-    return this.calendarType;
+  updateGridSettings(updates: Partial<GridSettings>): void {
+    this.gridSettings = { ...this.gridSettings, ...updates };
+    
+    // Update computed values
+    if (updates.snapInterval) {
+      this.config.minEventDuration = updates.snapInterval;
+    }
+    
+    // Emit grid settings update event
+    eventBus.emit(EventTypes.CONFIG_UPDATE, {
+      key: 'gridSettings',
+      value: this.gridSettings,
+      oldValue: this.gridSettings
+    });
   }
 
   /**
-   * Set calendar type
+   * Get date view settings
    */
-  setCalendarType(type: CalendarType): void {
-    const oldType = this.calendarType;
-    this.calendarType = type;
+  getDateViewSettings(): DateViewSettings {
+    return { ...this.dateViewSettings };
+  }
   
-    // Emit calendar type change event
+  /**
+   * Legacy method - for backwards compatibility
+   */
+  getDateHeaderSettings(): DateViewSettings {
+    return this.getDateViewSettings();
+  }
+
+  /**
+   * Update date view settings
+   */
+  updateDateViewSettings(updates: Partial<DateViewSettings>): void {
+    this.dateViewSettings = { ...this.dateViewSettings, ...updates };
+    
+    // Emit date view settings update event
+    eventBus.emit(EventTypes.CONFIG_UPDATE, {
+      key: 'dateViewSettings',
+      value: this.dateViewSettings,
+      oldValue: this.dateViewSettings
+    });
+  }
+  
+  /**
+   * Legacy method - for backwards compatibility
+   */
+  updateDateHeaderSettings(updates: Partial<DateViewSettings>): void {
+    this.updateDateViewSettings(updates);
+  }
+
+  /**
+   * Get resource view settings
+   */
+  getResourceViewSettings(): ResourceViewSettings {
+    return { ...this.resourceViewSettings };
+  }
+  
+  /**
+   * Legacy method - for backwards compatibility
+   */
+  getResourceHeaderSettings(): ResourceViewSettings {
+    return this.getResourceViewSettings();
+  }
+
+  /**
+   * Update resource view settings
+   */
+  updateResourceViewSettings(updates: Partial<ResourceViewSettings>): void {
+    this.resourceViewSettings = { ...this.resourceViewSettings, ...updates };
+    
+    // Emit resource view settings update event
+    eventBus.emit(EventTypes.CONFIG_UPDATE, {
+      key: 'resourceViewSettings',
+      value: this.resourceViewSettings,
+      oldValue: this.resourceViewSettings
+    });
+  }
+  
+  /**
+   * Legacy method - for backwards compatibility
+   */
+  updateResourceHeaderSettings(updates: Partial<ResourceViewSettings>): void {
+    this.updateResourceViewSettings(updates);
+  }
+
+  /**
+   * Check if current mode is resource-based
+   */
+  isResourceMode(): boolean {
+    return this.calendarMode === 'resource';
+  }
+
+  /**
+   * Check if current mode is date-based
+   */
+  isDateMode(): boolean {
+    return this.calendarMode === 'date';
+  }
+  
+  /**
+   * Legacy methods - for backwards compatibility
+   */
+  isResourceView(): boolean {
+    return this.isResourceMode();
+  }
+  
+  isDateView(): boolean {
+    return this.isDateMode();
+  }
+
+  /**
+   * Get calendar mode
+   */
+  getCalendarMode(): CalendarMode {
+    return this.calendarMode;
+  }
+
+  /**
+   * Set calendar mode
+   */
+  setCalendarMode(mode: CalendarMode): void {
+    const oldMode = this.calendarMode;
+    this.calendarMode = mode;
+    
+    // Emit calendar mode change event
     eventBus.emit(EventTypes.CALENDAR_TYPE_CHANGED, {
-      oldType,
-      newType: type
+      oldType: oldMode,
+      newType: mode
     });
   }
 

src/factories/CalendarTypeFactory.ts

@@ -19,11 +19,17 @@ export interface RendererConfig {
  */
 export class CalendarTypeFactory {
   private static renderers: Map<CalendarType, RendererConfig> = new Map();
+  private static isInitialized: boolean = false;
 
   /**
-   * Initialize the factory with default renderers
+   * Initialize the factory with default renderers (only runs once)
    */
   static initialize(): void {
+    if (this.isInitialized) {
+      console.warn('CalendarTypeFactory: Already initialized, skipping');
+      return;
+    }
+
     // Register default renderers
     this.registerRenderers('date', {
       headerRenderer: new DateHeaderRenderer(),
@@ -37,6 +43,7 @@ export class CalendarTypeFactory {
       eventRenderer: new ResourceEventRenderer()
     });
 
+    this.isInitialized = true;
     console.log('CalendarTypeFactory: Initialized with default renderers', Array.from(this.renderers.keys()));
   }
 

src/index.ts

@@ -8,32 +8,61 @@ import { EventRenderer } from './managers/EventRenderer.js';
 import { GridManager } from './managers/GridManager.js';
 import { ScrollManager } from './managers/ScrollManager.js';
 import { calendarConfig } from './core/CalendarConfig.js';
+import { CalendarTypeFactory } from './factories/CalendarTypeFactory.js';
 
 /**
- * Initialize the calendar application
+ * Initialize the calendar application with new state-driven approach
  */
-function initializeCalendar(): void {
-  console.log('🗓️ Initializing Calendar Plantempus...');
+async function initializeCalendar(): Promise<void> {
+  console.log('🗓️ Initializing Calendar Plantempus with state management...');
   
-  // Use the singleton calendar configuration
-  const config = calendarConfig;
+  // Declare managers outside try block for global access
+  let calendarManager: CalendarManager;
+  let navigationManager: NavigationManager;
+  let viewManager: ViewManager;
+  let eventManager: EventManager;
+  let eventRenderer: EventRenderer;
+  let gridManager: GridManager;
+  let scrollManager: ScrollManager;
   
-  // Initialize managers
-  const calendarManager = new CalendarManager(eventBus, config);
-  const navigationManager = new NavigationManager(eventBus);
-  const viewManager = new ViewManager(eventBus);
-  const eventManager = new EventManager(eventBus);
-  const eventRenderer = new EventRenderer(eventBus);
-  const scrollManager = new ScrollManager(); // Initialize BEFORE GridManager
-  const gridManager = new GridManager();
+  try {
+    // Use the singleton calendar configuration
+    const config = calendarConfig;
     
-  // Enable debug mode for development
-  eventBus.setDebug(true);
+    // Initialize the CalendarTypeFactory before creating managers
+    console.log('🏭 Phase 0: Initializing CalendarTypeFactory...');
+    CalendarTypeFactory.initialize();
     
-  // Initialize all managers
-  calendarManager.initialize();
+    // Initialize managers in proper order
+    console.log('📋 Phase 1: Creating core managers...');
+    calendarManager = new CalendarManager(eventBus, config);
+    navigationManager = new NavigationManager(eventBus);
+    viewManager = new ViewManager(eventBus);
     
-  console.log('✅ Calendar Plantempus initialized successfully with all core managers');
+    console.log('🎯 Phase 2: Creating data and rendering managers...');
+    // These managers will now respond to state-driven events
+    eventManager = new EventManager(eventBus);
+    eventRenderer = new EventRenderer(eventBus);
+    
+    console.log('🏗️ Phase 3: Creating layout managers...');  
+    scrollManager = new ScrollManager(); // Will respond to GRID_RENDERED
+    gridManager = new GridManager(); // Will respond to RENDERING_STARTED
+    
+    // Enable debug mode for development
+    eventBus.setDebug(true);
+    
+    // Initialize all managers using state-driven coordination
+    console.log('🚀 Phase 4: Starting state-driven initialization...');
+    await calendarManager.initialize(); // Now async and fully coordinated
+    
+    console.log('🎊 Calendar Plantempus initialized successfully!');
+    console.log('📊 Initialization Report:', calendarManager.getInitializationReport());
+    
+  } catch (error) {
+    console.error('💥 Calendar initialization failed:', error);
+    // Could implement fallback or retry logic here
+    throw error;
+  }
   
   // Expose to window for debugging
   (window as any).calendarDebug = {
@@ -48,9 +77,15 @@ function initializeCalendar(): void {
   };
 }
 
-// Initialize when DOM is ready
+// Initialize when DOM is ready - now handles async properly
 if (document.readyState === 'loading') {
-  document.addEventListener('DOMContentLoaded', initializeCalendar);
+  document.addEventListener('DOMContentLoaded', () => {
+    initializeCalendar().catch(error => {
+      console.error('Failed to initialize calendar:', error);
+    });
+  });
 } else {
-  initializeCalendar();
+  initializeCalendar().catch(error => {
+    console.error('Failed to initialize calendar:', error);
+  });
 }

src/managers/CalendarManager.ts

@@ -2,14 +2,17 @@ import { EventBus } from '../core/EventBus.js';
 import { EventTypes } from '../constants/EventTypes.js';
 import { CalendarConfig } from '../core/CalendarConfig.js';
 import { CalendarEvent, CalendarView, IEventBus } from '../types/CalendarTypes.js';
+import { CalendarStateManager } from './CalendarStateManager.js';
+import { StateEvents } from '../types/CalendarState.js';
 
 /**
- * CalendarManager - Hovedkoordinator for alle calendar managers
- * Håndterer initialisering, koordinering og kommunikation mellem alle managers
+ * CalendarManager - Main coordinator for all calendar managers
+ * Now delegates initialization to CalendarStateManager for better coordination
  */
 export class CalendarManager {
     private eventBus: IEventBus;
     private config: CalendarConfig;
+    private stateManager: CalendarStateManager;
     private currentView: CalendarView = 'week';
     private currentDate: Date = new Date();
     private isInitialized: boolean = false;
@@ -17,40 +20,37 @@ export class CalendarManager {
     constructor(eventBus: IEventBus, config: CalendarConfig) {
         this.eventBus = eventBus;
         this.config = config;
+        this.stateManager = new CalendarStateManager();
         this.setupEventListeners();
+        console.log('📋 CalendarManager: Created with state management');
     }
 
     /**
-     * Initialiser calendar systemet
+     * Initialize calendar system using state-driven approach
      */
-    public initialize(): void {
+    public async initialize(): Promise<void> {
         if (this.isInitialized) {
             console.warn('CalendarManager is already initialized');
             return;
         }
 
-        console.log('Initializing CalendarManager...');
+        console.log('🚀 CalendarManager: Starting state-driven initialization');
         
-        // Emit initialization event
-        this.eventBus.emit(EventTypes.CALENDAR_INITIALIZING, {
-            view: this.currentView,
-            date: this.currentDate,
-            config: this.config
-        });
+        try {
+            // Delegate to StateManager for coordinated initialization
+            await this.stateManager.initialize();
             
-        // Set initial view and date
-        this.setView(this.currentView);
-        this.setCurrentDate(this.currentDate);
+            // Set initial view and date after successful initialization
+            this.setView(this.currentView);
+            this.setCurrentDate(this.currentDate);
             
-        this.isInitialized = true;
+            this.isInitialized = true;
+            console.log('✅ CalendarManager: Initialization complete');
             
-        // Emit initialization complete event
-        this.eventBus.emit(EventTypes.CALENDAR_INITIALIZED, {
-            view: this.currentView,
-            date: this.currentDate
-        });
-
-        console.log('CalendarManager initialized successfully');
+        } catch (error) {
+            console.error('❌ CalendarManager initialization failed:', error);
+            throw error; // Let the caller handle the error
+        }
     }
 
     /**
@@ -139,7 +139,28 @@ export class CalendarManager {
      * Check om calendar er initialiseret
      */
     public isCalendarInitialized(): boolean {
-        return this.isInitialized;
+        return this.isInitialized && this.stateManager.isReady();
+    }
+
+    /**
+     * Get current calendar state
+     */
+    public getCurrentState(): string {
+        return this.stateManager.getCurrentState();
+    }
+
+    /**
+     * Get state manager for advanced operations
+     */
+    public getStateManager(): CalendarStateManager {
+        return this.stateManager;
+    }
+
+    /**
+     * Get initialization report for debugging
+     */
+    public getInitializationReport(): any {
+        return this.stateManager.getInitializationReport();
     }
 
     /**

src/managers/CalendarStateManager.ts

@@ -0,0 +1,471 @@
+// Calendar state management and coordination
+
+import { eventBus } from '../core/EventBus';
+import { calendarConfig } from '../core/CalendarConfig';
+import { 
+    CalendarState, 
+    StateEvents, 
+    CalendarEvent,
+    StateChangeEvent,
+    ErrorEvent,
+    VALID_STATE_TRANSITIONS,
+    InitializationPhase,
+    STATE_TO_PHASE
+} from '../types/CalendarState';
+
+/**
+ * Central coordinator for calendar initialization and state management
+ * Ensures proper sequencing and eliminates race conditions
+ */
+export class CalendarStateManager {
+    private currentState: CalendarState = CalendarState.UNINITIALIZED;
+    private stateHistory: Array<{ state: CalendarState; timestamp: number }> = [];
+    private initializationStartTime: number = 0;
+    private phaseTimings: Map<InitializationPhase, { start: number; end?: number }> = new Map();
+    
+    constructor() {
+        console.log('📋 CalendarStateManager: Created');
+        this.recordStateChange(CalendarState.UNINITIALIZED);
+    }
+
+    /**
+     * Get current calendar state
+     */
+    getCurrentState(): CalendarState {
+        return this.currentState;
+    }
+
+    /**
+     * Check if calendar is in ready state
+     */
+    isReady(): boolean {
+        return this.currentState === CalendarState.READY;
+    }
+
+    /**
+     * Get current initialization phase
+     */
+    getCurrentPhase(): InitializationPhase {
+        return STATE_TO_PHASE[this.currentState];
+    }
+
+    /**
+     * Main initialization method - coordinates all calendar setup
+     */
+    async initialize(): Promise<void> {
+        console.log('🚀 CalendarStateManager: Starting calendar initialization');
+        this.initializationStartTime = Date.now();
+        
+        try {
+            // Phase 1: Configuration loading (blocks everything else)
+            await this.executeConfigurationPhase();
+            
+            // Phase 2: Parallel data loading and DOM structure setup
+            await this.executeDataAndDOMPhase();
+            
+            // Phase 3: Event rendering (requires both data and DOM)
+            await this.executeEventRenderingPhase();
+            
+            // Phase 4: Finalization
+            await this.executeFinalizationPhase();
+            
+            const totalTime = Date.now() - this.initializationStartTime;
+            console.log(`🎊 Calendar initialization complete in ${totalTime}ms`);
+            
+        } catch (error) {
+            console.error('❌ Calendar initialization failed:', error);
+            await this.handleInitializationError(error as Error);
+        }
+    }
+
+    /**
+     * Phase 1: Configuration Loading
+     * Must complete before any other operations
+     */
+    private async executeConfigurationPhase(): Promise<void> {
+        console.log('📖 Phase 1: Configuration Loading');
+        await this.transitionTo(CalendarState.INITIALIZING);
+        
+        this.startPhase(InitializationPhase.CONFIGURATION);
+        
+        // Emit config loading started
+        this.emitEvent(StateEvents.CONFIG_LOADING_STARTED, 'CalendarStateManager', {
+            configSource: 'URL and DOM attributes'
+        });
+        
+        // Configuration is already loaded in CalendarConfig constructor
+        // but we validate and emit the completion event
+        const configValid = this.validateConfiguration();
+        
+        if (!configValid) {
+            throw new Error('Invalid calendar configuration');
+        }
+        
+        this.emitEvent(StateEvents.CONFIG_LOADED, 'CalendarStateManager', {
+            calendarMode: calendarConfig.getCalendarMode(),
+            dateViewSettings: calendarConfig.getDateViewSettings(),
+            gridSettings: calendarConfig.getGridSettings()
+        });
+        
+        await this.transitionTo(CalendarState.CONFIG_LOADED);
+        this.endPhase(InitializationPhase.CONFIGURATION);
+    }
+
+    /**
+     * Phase 2: Parallel Data Loading and DOM Setup
+     * These can run concurrently to improve performance
+     */
+    private async executeDataAndDOMPhase(): Promise<void> {
+        console.log('📊 Phase 2: Data Loading and DOM Setup (Parallel)');
+        this.startPhase(InitializationPhase.DATA_AND_DOM);
+        
+        // Start both data loading and rendering setup in parallel
+        const dataPromise = this.coordinateDataLoading();
+        const domPromise = this.coordinateDOMSetup();
+        
+        // Wait for both to complete
+        await Promise.all([dataPromise, domPromise]);
+        
+        this.endPhase(InitializationPhase.DATA_AND_DOM);
+    }
+
+    /**
+     * Coordinate data loading process
+     */
+    private async coordinateDataLoading(): Promise<void> {
+        await this.transitionTo(CalendarState.DATA_LOADING);
+        
+        this.emitEvent(StateEvents.DATA_LOADING_STARTED, 'CalendarStateManager', {
+            mode: calendarConfig.getCalendarMode(),
+            period: this.getCurrentPeriod()
+        });
+        
+        // EventManager will respond to DATA_LOADING_STARTED and load data
+        // We wait for its DATA_LOADED response
+        await this.waitForEvent(StateEvents.DATA_LOADED, 10000);
+        
+        await this.transitionTo(CalendarState.DATA_LOADED);
+        console.log('✅ Data loading phase complete');
+    }
+
+    /**
+     * Coordinate DOM structure setup
+     */
+    private async coordinateDOMSetup(): Promise<void> {
+        await this.transitionTo(CalendarState.RENDERING);
+        
+        this.emitEvent(StateEvents.RENDERING_STARTED, 'CalendarStateManager', {
+            phase: 'DOM structure setup'
+        });
+        
+        // GridManager will respond to RENDERING_STARTED and create DOM structure
+        // We wait for its GRID_RENDERED response
+        await this.waitForEvent(StateEvents.GRID_RENDERED, 5000);
+        
+        await this.transitionTo(CalendarState.RENDERED);
+        console.log('✅ DOM setup phase complete');
+    }
+
+    /**
+     * Phase 3: Event Rendering
+     * Requires both data and DOM to be ready
+     */
+    private async executeEventRenderingPhase(): Promise<void> {
+        console.log('🎨 Phase 3: Event Rendering');
+        this.startPhase(InitializationPhase.EVENT_RENDERING);
+        
+        // Both data and DOM are ready, trigger event rendering
+        // EventRenderer will wait for both GRID_RENDERED and DATA_LOADED
+        
+        // Wait for events to be rendered
+        await this.waitForEvent(StateEvents.EVENTS_RENDERED, 3000);
+        
+        this.emitEvent(StateEvents.RENDERING_COMPLETE, 'CalendarStateManager', {
+            phase: 'Event rendering complete'
+        });
+        
+        this.endPhase(InitializationPhase.EVENT_RENDERING);
+        console.log('✅ Event rendering phase complete');
+    }
+
+    /**
+     * Phase 4: Finalization
+     * System is ready for user interaction
+     */
+    private async executeFinalizationPhase(): Promise<void> {
+        console.log('🏁 Phase 4: Finalization');
+        this.startPhase(InitializationPhase.FINALIZATION);
+        
+        await this.transitionTo(CalendarState.READY);
+        
+        const totalTime = Date.now() - this.initializationStartTime;
+        
+        this.emitEvent(StateEvents.CALENDAR_READY, 'CalendarStateManager', {
+            initializationTime: totalTime,
+            finalState: this.currentState,
+            phaseTimings: this.getPhaseTimings()
+        });
+        
+        this.endPhase(InitializationPhase.FINALIZATION);
+        console.log(`🎉 Calendar is ready! Total initialization time: ${totalTime}ms`);
+    }
+
+    /**
+     * Transition to a new state with validation
+     */
+    private async transitionTo(newState: CalendarState): Promise<void> {
+        if (!this.isValidTransition(this.currentState, newState)) {
+            const error = new Error(`Invalid state transition: ${this.currentState} → ${newState}`);
+            await this.handleInitializationError(error);
+            return;
+        }
+
+        const oldState = this.currentState;
+        this.currentState = newState;
+        this.recordStateChange(newState);
+
+        // Emit state change event
+        const stateChangeEvent: StateChangeEvent = {
+            type: StateEvents.CALENDAR_STATE_CHANGED,
+            component: 'CalendarStateManager',
+            timestamp: Date.now(),
+            data: {
+                from: oldState,
+                to: newState,
+                transitionValid: true
+            },
+            metadata: {
+                phase: STATE_TO_PHASE[newState]
+            }
+        };
+
+        eventBus.emit(StateEvents.CALENDAR_STATE_CHANGED, stateChangeEvent);
+        console.log(`📍 State: ${oldState} → ${newState} [${STATE_TO_PHASE[newState]}]`);
+    }
+
+    /**
+     * Validate state transition
+     */
+    private isValidTransition(from: CalendarState, to: CalendarState): boolean {
+        const allowedTransitions = VALID_STATE_TRANSITIONS[from] || [];
+        return allowedTransitions.includes(to);
+    }
+
+    /**
+     * Handle initialization errors with recovery attempts
+     */
+    private async handleInitializationError(error: Error): Promise<void> {
+        console.error('💥 Initialization error:', error);
+        
+        const errorEvent: ErrorEvent = {
+            type: StateEvents.CALENDAR_ERROR,
+            component: 'CalendarStateManager',
+            error,
+            timestamp: Date.now(),
+            data: {
+                failedComponent: 'CalendarStateManager',
+                currentState: this.currentState,
+                canRecover: this.canRecoverFromError(error)
+            }
+        };
+        
+        eventBus.emit(StateEvents.CALENDAR_ERROR, errorEvent);
+        
+        // Attempt recovery if possible
+        if (this.canRecoverFromError(error)) {
+            await this.attemptRecovery(error);
+        } else {
+            await this.transitionTo(CalendarState.ERROR);
+        }
+    }
+
+    /**
+     * Attempt to recover from errors
+     */
+    private async attemptRecovery(error: Error): Promise<void> {
+        console.log('🔧 Attempting error recovery...');
+        
+        this.emitEvent(StateEvents.RECOVERY_ATTEMPTED, 'CalendarStateManager', {
+            error: error.message,
+            currentState: this.currentState
+        });
+        
+        try {
+            // Simple recovery strategy: try to continue from a stable state
+            if (this.currentState === CalendarState.DATA_LOADING) {
+                // Retry data loading
+                await this.coordinateDataLoading();
+            } else if (this.currentState === CalendarState.RENDERING) {
+                // Retry DOM setup
+                await this.coordinateDOMSetup();
+            }
+            
+            this.emitEvent(StateEvents.RECOVERY_SUCCESS, 'CalendarStateManager', {
+                recoveredFrom: error.message
+            });
+            
+        } catch (recoveryError) {
+            console.error('❌ Recovery failed:', recoveryError);
+            
+            this.emitEvent(StateEvents.RECOVERY_FAILED, 'CalendarStateManager', {
+                originalError: error.message,
+                recoveryError: (recoveryError as Error).message
+            });
+            
+            await this.transitionTo(CalendarState.ERROR);
+        }
+    }
+
+    /**
+     * Determine if error is recoverable
+     */
+    private canRecoverFromError(error: Error): boolean {
+        // Simple recovery logic - can be extended
+        const recoverableErrors = [
+            'timeout',
+            'network',
+            'dom not ready',
+            'data loading failed'
+        ];
+        
+        return recoverableErrors.some(pattern => 
+            error.message.toLowerCase().includes(pattern)
+        );
+    }
+
+    /**
+     * Validate calendar configuration
+     */
+    private validateConfiguration(): boolean {
+        try {
+            const mode = calendarConfig.getCalendarMode();
+            const gridSettings = calendarConfig.getGridSettings();
+            
+            // Basic validation
+            if (!mode || !['date', 'resource'].includes(mode)) {
+                console.error('Invalid calendar mode:', mode);
+                return false;
+            }
+            
+            if (!gridSettings.hourHeight || gridSettings.hourHeight < 20) {
+                console.error('Invalid hour height:', gridSettings.hourHeight);
+                return false;
+            }
+            
+            return true;
+        } catch (error) {
+            console.error('Configuration validation failed:', error);
+            return false;
+        }
+    }
+
+    /**
+     * Get current period for data loading
+     */
+    private getCurrentPeriod(): { start: string; end: string } {
+        const currentDate = calendarConfig.getSelectedDate() || new Date();
+        const mode = calendarConfig.getCalendarMode();
+        
+        if (mode === 'date') {
+            const dateSettings = calendarConfig.getDateViewSettings();
+            
+            if (dateSettings.period === 'week') {
+                const weekStart = new Date(currentDate);
+                weekStart.setDate(currentDate.getDate() - currentDate.getDay());
+                const weekEnd = new Date(weekStart);
+                weekEnd.setDate(weekStart.getDate() + 6);
+                
+                return {
+                    start: weekStart.toISOString().split('T')[0],
+                    end: weekEnd.toISOString().split('T')[0]
+                };
+            }
+        }
+        
+        // Default to current day
+        return {
+            start: currentDate.toISOString().split('T')[0],
+            end: currentDate.toISOString().split('T')[0]
+        };
+    }
+
+    /**
+     * Utility methods
+     */
+    private recordStateChange(state: CalendarState): void {
+        this.stateHistory.push({
+            state,
+            timestamp: Date.now()
+        });
+    }
+
+    private startPhase(phase: InitializationPhase): void {
+        this.phaseTimings.set(phase, { start: Date.now() });
+    }
+
+    private endPhase(phase: InitializationPhase): void {
+        const timing = this.phaseTimings.get(phase);
+        if (timing) {
+            timing.end = Date.now();
+            console.log(`⏱️ ${phase} completed in ${timing.end - timing.start}ms`);
+        }
+    }
+
+    private getPhaseTimings(): Record<string, number> {
+        const timings: Record<string, number> = {};
+        
+        this.phaseTimings.forEach((timing, phase) => {
+            if (timing.start && timing.end) {
+                timings[phase] = timing.end - timing.start;
+            }
+        });
+        
+        return timings;
+    }
+
+    private emitEvent(type: string, component: string, data?: any): void {
+        const event: CalendarEvent = {
+            type,
+            component,
+            timestamp: Date.now(),
+            data,
+            metadata: {
+                phase: this.getCurrentPhase()
+            }
+        };
+        
+        eventBus.emit(type, event);
+    }
+
+    private async waitForEvent(eventType: string, timeout: number = 5000): Promise<any> {
+        return new Promise((resolve, reject) => {
+            const timer = setTimeout(() => {
+                reject(new Error(`Timeout waiting for event: ${eventType}`));
+            }, timeout);
+            
+            const handler = (event: Event) => {
+                clearTimeout(timer);
+                resolve((event as CustomEvent).detail);
+                eventBus.off(eventType, handler);
+            };
+            
+            eventBus.on(eventType, handler);
+        });
+    }
+
+    /**
+     * Debug methods
+     */
+    getStateHistory(): Array<{ state: CalendarState; timestamp: number }> {
+        return [...this.stateHistory];
+    }
+
+    getInitializationReport(): any {
+        return {
+            currentState: this.currentState,
+            totalTime: Date.now() - this.initializationStartTime,
+            phaseTimings: this.getPhaseTimings(),
+            stateHistory: this.stateHistory
+        };
+    }
+}

src/managers/DataManager.ts

@@ -2,14 +2,14 @@
 
 import { eventBus } from '../core/EventBus';
 import { EventTypes } from '../constants/EventTypes';
-import { CalendarEvent, EventData, Period, EventType } from '../types/CalendarTypes';
+import { CalendarEvent, EventData, Period } from '../types/CalendarTypes';
 
 /**
  * Event creation data interface
  */
 interface EventCreateData {
   title: string;
-  type: EventType;
+  type: string;
   start: string;
   end: string;
   allDay: boolean;
@@ -67,7 +67,7 @@ export class DataManager {
    * Fetch events for a specific period
    */
   async fetchEventsForPeriod(period: Period): Promise<EventData> {
-    const cacheKey = `${period.start}-${period.end}-${period.view}`;
+    const cacheKey = `${period.start}-${period.end}`;
     
     // Check cache first
     if (this.cache.has(cacheKey)) {
@@ -90,8 +90,7 @@ export class DataManager {
         // Real API call
         const params = new URLSearchParams({
           start: period.start,
-          end: period.end,
-          view: period.view
+          end: period.end
         });
         
         const response = await fetch(`${this.baseUrl}?${params}`);
@@ -275,8 +274,8 @@ export class DataManager {
    */
   private getMockData(period: Period): EventData {
     const events: CalendarEvent[] = [];
-    const types: EventType[] = ['meeting', 'meal', 'work', 'milestone'];
-    const titles: Record<EventType, string[]> = {
+    const types: string[] = ['meeting', 'meal', 'work', 'milestone'];
+    const titles: Record<string, string[]> = {
       meeting: ['Team Standup', 'Client Meeting', 'Project Review', 'Sprint Planning', 'Design Review'],
       meal: ['Breakfast', 'Lunch', 'Coffee Break', 'Dinner'],
       work: ['Deep Work Session', 'Code Review', 'Documentation', 'Testing'],
@@ -296,7 +295,7 @@ export class DataManager {
       if (isWeekend) {
         // Maybe one or two events on weekends
         if (Math.random() > 0.7) {
-          const type: EventType = 'meal';
+          const type: string = 'meal';
           const title = titles[type][Math.floor(Math.random() * titles[type].length)];
           const hour = 12 + Math.floor(Math.random() * 4);
           
@@ -358,10 +357,11 @@ export class DataManager {
       }
     }
 
-    // Add a multi-day event
-    if (period.view === 'week') {
+    // Add a multi-day event if period spans multiple days
+    const daysDiff = Math.ceil((endDate.getTime() - startDate.getTime()) / (1000 * 60 * 60 * 24));
+    if (daysDiff > 1) {
       const midWeek = new Date(startDate);
-      midWeek.setDate(midWeek.getDate() + 2);
+      midWeek.setDate(midWeek.getDate() + Math.min(2, daysDiff - 1));
       
       events.push({
         id: `evt-${events.length + 1}`,
@@ -379,7 +379,6 @@ export class DataManager {
       meta: {
         start: period.start,
         end: period.end,
-        view: period.view,
         total: events.length
       }
     };

src/managers/EventManager.ts

@@ -1,6 +1,7 @@
 import { EventBus } from '../core/EventBus';
 import { IEventBus, CalendarEvent, ResourceCalendarData } from '../types/CalendarTypes';
 import { EventTypes } from '../constants/EventTypes';
+import { StateEvents } from '../types/CalendarState';
 import { calendarConfig } from '../core/CalendarConfig';
 
 /**
@@ -15,33 +16,54 @@ export class EventManager {
         console.log('EventManager: Constructor called');
         this.eventBus = eventBus;
         this.setupEventListeners();
-        console.log('EventManager: About to call loadMockData()');
-        this.loadMockData().then(() => {
-            console.log('EventManager: loadMockData() completed, syncing events');
-            // Data loaded, sync events after loading
-            this.syncEvents();
-        }).catch(error => {
-            console.error('EventManager: loadMockData() failed:', error);
-        });
+        console.log('EventManager: Waiting for CALENDAR_INITIALIZED before loading data');
     }
 
     private setupEventListeners(): void {
-        this.eventBus.on(EventTypes.CALENDAR_INITIALIZED, () => {
-            this.syncEvents();
+        // Listen for state-driven data loading request
+        this.eventBus.on(StateEvents.DATA_LOADING_STARTED, (e: Event) => {
+            const detail = (e as CustomEvent).detail;
+            console.log('EventManager: Received DATA_LOADING_STARTED, starting data load');
+            
+            this.loadMockData().then(() => {
+                console.log('EventManager: loadMockData() completed, emitting DATA_LOADED');
+                // Emit state-driven data loaded event
+                this.eventBus.emit(StateEvents.DATA_LOADED, {
+                    type: StateEvents.DATA_LOADED,
+                    component: 'EventManager',
+                    timestamp: Date.now(),
+                    data: {
+                        eventCount: this.events.length,
+                        calendarMode: calendarConfig.getCalendarMode(),
+                        period: detail.data?.period || { start: '', end: '' },
+                        events: this.events // Include actual events for EventRenderer
+                    },
+                    metadata: {
+                        phase: 'data-loading'
+                    }
+                });
+            }).catch(error => {
+                console.error('EventManager: loadMockData() failed:', error);
+                this.eventBus.emit(StateEvents.DATA_FAILED, {
+                    type: StateEvents.DATA_FAILED,
+                    component: 'EventManager',
+                    timestamp: Date.now(),
+                    error,
+                    metadata: {
+                        phase: 'data-loading'
+                    }
+                });
+            });
         });
 
-        this.eventBus.on(EventTypes.DATE_CHANGED, () => {
-            this.syncEvents();
-        });
 
-        this.eventBus.on(EventTypes.VIEW_RENDERED, () => {
-            this.syncEvents();
-        });
+        // Legacy event listeners removed - data is now managed via state-driven events only
+
     }
 
     private async loadMockData(): Promise<void> {
         try {
-            const calendarType = calendarConfig.getCalendarType();
+            const calendarType = calendarConfig.getCalendarMode();
             let jsonFile: string;
             
             console.log(`EventManager: Calendar type detected: '${calendarType}'`);
@@ -59,43 +81,41 @@ export class EventManager {
                 throw new Error(`Failed to load mock events: ${response.status}`);
             }
             
-            if (calendarType === 'resource') {
-                const resourceData: ResourceCalendarData = await response.json();
-                // Flatten events from all resources and add resource metadata
-                this.events = resourceData.resources.flatMap(resource => 
-                    resource.events.map(event => ({
-                        ...event,
-                        resourceName: resource.name,
-                        resourceDisplayName: resource.displayName,
-                        resourceEmployeeId: resource.employeeId
-                    }))
-                );
-                console.log(`EventManager: Loaded ${this.events.length} events from ${resourceData.resources.length} resources`);
+            const data = await response.json();
+            console.log(`EventManager: Loaded data for ${calendarType} calendar`);
             
-                // Emit resource data for GridManager
-                this.eventBus.emit(EventTypes.RESOURCE_DATA_LOADED, {
-                    resourceData: resourceData
-                });
-            } else {
-                this.events = await response.json();
-                console.log(`EventManager: Loaded ${this.events.length} date calendar events`);
-            }
+            // Remove legacy double emission - data is sent via StateEvents.DATA_LOADED only
             
-            console.log('EventManager: First event:', this.events[0]);
-            console.log('EventManager: Last event:', this.events[this.events.length - 1]);
+            // Process data for internal use
+            this.processCalendarData(calendarType, data);
         } catch (error) {
             console.error('EventManager: Failed to load mock events:', error);
             this.events = []; // Fallback to empty array
         }
     }
 
-    private syncEvents(): void {
-        // Emit events for rendering
-        this.eventBus.emit(EventTypes.EVENTS_LOADED, {
-            events: this.events
-        });
+    private processCalendarData(calendarType: string, data: any): void {
+        if (calendarType === 'resource') {
+            const resourceData = data as ResourceCalendarData;
+            this.events = resourceData.resources.flatMap(resource => 
+                resource.events.map(event => ({
+                    ...event,
+                    resourceName: resource.name,
+                    resourceDisplayName: resource.displayName,
+                    resourceEmployeeId: resource.employeeId
+                }))
+            );
+            console.log(`EventManager: Processed ${this.events.length} events from ${resourceData.resources.length} resources`);
+        } else {
+            this.events = data as CalendarEvent[];
+            console.log(`EventManager: Processed ${this.events.length} date events`);
+        }
+    }
 
-        console.log(`EventManager: Synced ${this.events.length} events`);
+    private syncEvents(): void {
+        // Events are now synced via StateEvents.DATA_LOADED during initialization
+        // This method maintained for internal state management only
+        console.log(`EventManager: Internal sync - ${this.events.length} events in memory`);
     }
 
     public getEvents(): CalendarEvent[] {

src/managers/EventRenderer.ts

@@ -1,6 +1,7 @@
 import { EventBus } from '../core/EventBus';
 import { IEventBus, CalendarEvent } from '../types/CalendarTypes';
 import { EventTypes } from '../constants/EventTypes';
+import { StateEvents } from '../types/CalendarState';
 import { calendarConfig } from '../core/CalendarConfig';
 import { CalendarTypeFactory } from '../factories/CalendarTypeFactory';
 
@@ -11,30 +12,36 @@ import { CalendarTypeFactory } from '../factories/CalendarTypeFactory';
 export class EventRenderer {
     private eventBus: IEventBus;
     private pendingEvents: CalendarEvent[] = [];
+    private dataReady: boolean = false;
+    private gridReady: boolean = false;
 
     constructor(eventBus: IEventBus) {
         this.eventBus = eventBus;
         this.setupEventListeners();
-        
-        // Initialize the factory (if not already done)
-        CalendarTypeFactory.initialize();
     }
 
     private setupEventListeners(): void {
-        this.eventBus.on(EventTypes.EVENTS_LOADED, (event: Event) => {
+        // Listen for state-driven data loaded event
+        this.eventBus.on(StateEvents.DATA_LOADED, (event: Event) => {
             const customEvent = event as CustomEvent;
-            const { events } = customEvent.detail;
-            console.log('EventRenderer: Received EVENTS_LOADED with', events.length, 'events');
-            // Store events but don't render yet - wait for grid to be ready
-            this.pendingEvents = events;
+            // Events are in customEvent.detail (direct from StateEvent payload)
+            const eventCount = customEvent.detail.data?.eventCount || 0;
+            const events = customEvent.detail.data?.events || [];
+            console.log('EventRenderer: Received DATA_LOADED with', eventCount, 'events');
+            this.pendingEvents = events; // Store the actual events
+            this.dataReady = true;
             this.tryRenderEvents();
         });
 
-        this.eventBus.on(EventTypes.GRID_RENDERED, () => {
-            // Grid is ready, now we can render events
+        // Listen for state-driven grid rendered event  
+        this.eventBus.on(StateEvents.GRID_RENDERED, (event: Event) => {
+            const customEvent = event as CustomEvent;
+            console.log('EventRenderer: Received GRID_RENDERED');
+            this.gridReady = true;
             this.tryRenderEvents();
         });
 
+
         this.eventBus.on(EventTypes.VIEW_RENDERED, () => {
             // Clear existing events when view changes
             this.clearEvents();
@@ -48,20 +55,50 @@ export class EventRenderer {
     }
 
     private tryRenderEvents(): void {
-        // Only render if we have both events and appropriate columns are ready
-        console.log('EventRenderer: tryRenderEvents called, pending events:', this.pendingEvents.length);
+        // Only render if we have both data and grid ready
+        console.log('EventRenderer: tryRenderEvents called', {
+            dataReady: this.dataReady,
+            gridReady: this.gridReady,
+            pendingEvents: this.pendingEvents.length
+        });
+        
+        if (!this.dataReady || !this.gridReady) {
+            console.log('EventRenderer: Waiting - data ready:', this.dataReady, 'grid ready:', this.gridReady);
+            return;
+        }
         
         if (this.pendingEvents.length > 0) {
-            const calendarType = calendarConfig.getCalendarType();
+            const calendarType = calendarConfig.getCalendarMode();
             let columnsSelector = calendarType === 'resource' ? 'swp-resource-column' : 'swp-day-column';
             const columns = document.querySelectorAll(columnsSelector);
             
             console.log(`EventRenderer: Found ${columns.length} ${columnsSelector} elements for ${calendarType} calendar`);
             
             if (columns.length > 0) {
+                console.log('🎨 EventRenderer: Both data and grid ready, rendering events!');
+                const eventCount = this.pendingEvents.length;
                 this.renderEvents(this.pendingEvents);
                 this.pendingEvents = []; // Clear pending events after rendering
+                
+                // Emit events rendered event
+                this.eventBus.emit(StateEvents.EVENTS_RENDERED, {
+                    type: StateEvents.EVENTS_RENDERED,
+                    component: 'EventRenderer',
+                    timestamp: Date.now(),
+                    data: {
+                        eventCount,
+                        calendarMode: calendarType,
+                        renderMethod: 'state-driven'
+                    },
+                    metadata: {
+                        phase: 'event-rendering'
+                    }
+                });
+            } else {
+                console.log('EventRenderer: Grid not ready yet, columns not found');
             }
+        } else {
+            console.log('EventRenderer: No pending events to render');
         }
     }
 
@@ -69,7 +106,7 @@ export class EventRenderer {
         console.log('EventRenderer: renderEvents called with', events.length, 'events');
         
         // Get the appropriate event renderer strategy
-        const calendarType = calendarConfig.getCalendarType();
+        const calendarType = calendarConfig.getCalendarMode();
         const eventRenderer = CalendarTypeFactory.getEventRenderer(calendarType);
         
         console.log(`EventRenderer: Using ${calendarType} event renderer strategy`);
@@ -84,7 +121,7 @@ export class EventRenderer {
     }
 
     private clearEvents(): void {
-        const calendarType = calendarConfig.getCalendarType();
+        const calendarType = calendarConfig.getCalendarMode();
         const eventRenderer = CalendarTypeFactory.getEventRenderer(calendarType);
         eventRenderer.clearEvents();
     }

src/managers/GridManager.ts

@@ -3,6 +3,7 @@
 import { eventBus } from '../core/EventBus';
 import { calendarConfig } from '../core/CalendarConfig';
 import { EventTypes } from '../constants/EventTypes';
+import { StateEvents } from '../types/CalendarState';
 import { DateUtils } from '../utils/DateUtils';
 import { ResourceCalendarData } from '../types/CalendarTypes';
 import { CalendarTypeFactory } from '../factories/CalendarTypeFactory';
@@ -29,13 +30,11 @@ export class GridManager {
   private resourceData: ResourceCalendarData | null = null; // Store resource data for resource calendar
   
   constructor() {
+    console.log('🏗️ GridManager: Constructor called');
     this.init();
   }
 
   private init(): void {
-    // Initialize the factory
-    CalendarTypeFactory.initialize();
-    
     this.findElements();
     this.subscribeToEvents();
     
@@ -43,8 +42,8 @@ export class GridManager {
     if (!this.currentWeek) {
       this.currentWeek = this.getWeekStart(new Date());
       console.log('GridManager: Set initial currentWeek to', this.currentWeek);
-      // Render initial grid
-      this.render();
+      // Don't render immediately - wait for proper initialization event
+      console.log('GridManager: Waiting for initialization complete before rendering');
     }
   }
 
@@ -58,6 +57,13 @@ export class GridManager {
   }
 
   private subscribeToEvents(): void {
+    // Listen for state-driven rendering start event  
+    eventBus.on(StateEvents.RENDERING_STARTED, (e: Event) => {
+      const detail = (e as CustomEvent).detail;
+      console.log('GridManager: Received RENDERING_STARTED, starting DOM structure setup');
+      this.render();
+    });
+
     // Re-render grid on config changes
     eventBus.on(EventTypes.CONFIG_UPDATE, (e: Event) => {
       const detail = (e as CustomEvent).detail;
@@ -96,18 +102,15 @@ export class GridManager {
       this.updateAllDayEvents(detail.events);
     });
 
-    // Handle resource data loaded
-    eventBus.on(EventTypes.RESOURCE_DATA_LOADED, (e: Event) => {
+    // Handle data loaded for resource mode
+    eventBus.on(StateEvents.DATA_LOADED, (e: Event) => {
       const detail = (e as CustomEvent).detail;
-      this.resourceData = detail.resourceData;
-      console.log(`GridManager: Received resource data for ${this.resourceData!.resources.length} resources`);
+      console.log(`GridManager: Received DATA_LOADED`);
       
-      // Update grid styles with new column count immediately
-      this.updateGridStyles();
-      
-      // Re-render if grid is already rendered
-      if (this.grid && this.grid.children.length > 0) {
-        this.render();
+      if (detail.data && detail.data.calendarMode === 'resource') {
+        // Resource data will be passed in the state event
+        // For now just update grid styles
+        this.updateGridStyles();
       }
     });
 
@@ -124,12 +127,54 @@ export class GridManager {
     this.updateGridStyles();
     this.renderGrid();
     
-    // Emit grid rendered event
+    // Emit state-driven grid rendered event
+    const columnCount = this.getColumnCount();
     console.log('GridManager: Emitting GRID_RENDERED event');
-    eventBus.emit(EventTypes.GRID_RENDERED);
+    
+    eventBus.emit(StateEvents.GRID_RENDERED, {
+      type: StateEvents.GRID_RENDERED,
+      component: 'GridManager',
+      timestamp: Date.now(),
+      data: {
+        columnCount,
+        gridMode: calendarConfig.getCalendarMode(),
+        domElementsCreated: [
+          'swp-header-spacer',
+          'swp-time-axis', 
+          'swp-grid-container',
+          'swp-calendar-header',
+          'swp-scrollable-content'
+        ]
+      },
+      metadata: {
+        phase: 'rendering'
+      }
+    });
+    
     console.log('GridManager: GRID_RENDERED event emitted');
   }
 
+  /**
+   * Get current column count based on calendar mode
+   */
+  private getColumnCount(): number {
+    const calendarType = calendarConfig.getCalendarMode();
+    
+    if (calendarType === 'resource' && this.resourceData) {
+      return this.resourceData.resources.length;
+    } else if (calendarType === 'date') {
+      const dateSettings = calendarConfig.getDateViewSettings();
+      switch (dateSettings.period) {
+        case 'day': return 1;
+        case 'week': return dateSettings.weekDays;
+        case 'month': return 7;
+        default: return dateSettings.weekDays;
+      }
+    }
+    
+    return 7; // Default
+  }
+
   /**
    * Render the complete grid using POC structure
    */
@@ -148,10 +193,10 @@ export class GridManager {
     // Only clear and rebuild if grid is empty (first render)
     if (this.grid.children.length === 0) {
       console.log('GridManager: First render - creating grid structure');
-      // Create POC structure: header-spacer + time-axis + week-container + right-column + bottom spacers
+      // Create POC structure: header-spacer + time-axis + grid-container
       this.createHeaderSpacer();
       this.createTimeAxis();
-      this.createWeekContainer();
+      this.createGridContainer();
     } else {
       console.log('GridManager: Re-render - updating existing structure');
       // Just update the calendar header for all-day events
@@ -172,15 +217,16 @@ export class GridManager {
   }
 
   /**
-   * Create time axis (positioned beside week container) like in POC
+   * Create time axis (positioned beside grid container) like in POC
    */
   private createTimeAxis(): void {
     if (!this.grid) return;
 
     const timeAxis = document.createElement('swp-time-axis');
     const timeAxisContent = document.createElement('swp-time-axis-content');
-    const startHour = calendarConfig.get('dayStartHour');
-    const endHour = calendarConfig.get('dayEndHour');
+    const gridSettings = calendarConfig.getGridSettings();
+    const startHour = gridSettings.dayStartHour;
+    const endHour = gridSettings.dayEndHour;
     console.log('GridManager: Creating time axis - startHour:', startHour, 'endHour:', endHour);
 
     for (let hour = startHour; hour < endHour; hour++) {
@@ -196,17 +242,17 @@ export class GridManager {
   }
 
   /**
-   * Create week container with header and scrollable content using Strategy Pattern
+   * Create grid container with header and scrollable content using Strategy Pattern
    */
-  private createWeekContainer(): void {
+  private createGridContainer(): void {
     if (!this.grid || !this.currentWeek) return;
 
-    const weekContainer = document.createElement('swp-grid-container');
+    const gridContainer = document.createElement('swp-grid-container');
     
     // Create calendar header using Strategy Pattern
     const calendarHeader = document.createElement('swp-calendar-header');
     this.renderCalendarHeader(calendarHeader);
-    weekContainer.appendChild(calendarHeader);
+    gridContainer.appendChild(calendarHeader);
     
     // Create scrollable content
     const scrollableContent = document.createElement('swp-scrollable-content');
@@ -222,9 +268,9 @@ export class GridManager {
     timeGrid.appendChild(columnContainer);
     
     scrollableContent.appendChild(timeGrid);
-    weekContainer.appendChild(scrollableContent);
+    gridContainer.appendChild(scrollableContent);
     
-    this.grid.appendChild(weekContainer);
+    this.grid.appendChild(gridContainer);
   }
 
   /**
@@ -233,7 +279,7 @@ export class GridManager {
   private renderCalendarHeader(calendarHeader: HTMLElement): void {
     if (!this.currentWeek) return;
 
-    const calendarType = calendarConfig.getCalendarType();
+    const calendarType = calendarConfig.getCalendarMode();
     const headerRenderer = CalendarTypeFactory.getHeaderRenderer(calendarType);
     
     const context: HeaderRenderContext = {
@@ -256,7 +302,7 @@ export class GridManager {
     if (!this.currentWeek) return;
 
     console.log('GridManager: renderColumnContainer called');
-    const calendarType = calendarConfig.getCalendarType();
+    const calendarType = calendarConfig.getCalendarMode();
     const columnRenderer = CalendarTypeFactory.getColumnRenderer(calendarType);
     
     const context: ColumnRenderContext = {
@@ -330,30 +376,44 @@ export class GridManager {
    */
   private updateGridStyles(): void {
     const root = document.documentElement;
-    const config = calendarConfig.getAll();
+    const gridSettings = calendarConfig.getGridSettings();
     const calendar = document.querySelector('swp-calendar') as HTMLElement;
-    const calendarType = calendarConfig.getCalendarType();
+    const calendarType = calendarConfig.getCalendarMode();
     
     // Set CSS variables
-    root.style.setProperty('--hour-height', `${config.hourHeight}px`);
-    root.style.setProperty('--minute-height', `${config.hourHeight / 60}px`);
-    root.style.setProperty('--snap-interval', config.snapInterval.toString());
-    root.style.setProperty('--day-start-hour', config.dayStartHour.toString());
-    root.style.setProperty('--day-end-hour', config.dayEndHour.toString());
-    root.style.setProperty('--work-start-hour', config.workStartHour.toString());
-    root.style.setProperty('--work-end-hour', config.workEndHour.toString());
+    root.style.setProperty('--hour-height', `${gridSettings.hourHeight}px`);
+    root.style.setProperty('--minute-height', `${gridSettings.hourHeight / 60}px`);
+    root.style.setProperty('--snap-interval', gridSettings.snapInterval.toString());
+    root.style.setProperty('--day-start-hour', gridSettings.dayStartHour.toString());
+    root.style.setProperty('--day-end-hour', gridSettings.dayEndHour.toString());
+    root.style.setProperty('--work-start-hour', gridSettings.workStartHour.toString());
+    root.style.setProperty('--work-end-hour', gridSettings.workEndHour.toString());
     
     // Set number of columns based on calendar type
     let columnCount = 7; // Default for date mode
     if (calendarType === 'resource' && this.resourceData) {
       columnCount = this.resourceData.resources.length;
     } else if (calendarType === 'date') {
-      columnCount = config.weekDays;
+      const dateSettings = calendarConfig.getDateViewSettings();
+      // Calculate columns based on view type - business logic moved from config
+      switch (dateSettings.period) {
+        case 'day':
+          columnCount = 1;
+          break;
+        case 'week':
+          columnCount = dateSettings.weekDays;
+          break;
+        case 'month':
+          columnCount = 7;
+          break;
+        default:
+          columnCount = dateSettings.weekDays;
+      }
     }
     root.style.setProperty('--grid-columns', columnCount.toString());
     
     // Set day column min width based on fitToWidth setting
-    if (config.fitToWidth) {
+    if (gridSettings.fitToWidth) {
       root.style.setProperty('--day-column-min-width', '50px'); // Small min-width allows columns to fit available space
     } else {
       root.style.setProperty('--day-column-min-width', '250px'); // Default min-width for horizontal scroll mode
@@ -361,7 +421,7 @@ export class GridManager {
     
     // Set fitToWidth data attribute for CSS targeting
     if (calendar) {
-      calendar.setAttribute('data-fit-to-width', config.fitToWidth.toString());
+      calendar.setAttribute('data-fit-to-width', gridSettings.fitToWidth.toString());
     }
     
     console.log('GridManager: Updated grid styles with', columnCount, 'columns for', calendarType, 'calendar');
@@ -419,10 +479,11 @@ export class GridManager {
     const rect = dayColumn.getBoundingClientRect();
     const y = event.clientY - rect.top;
     
-    const hourHeight = calendarConfig.get('hourHeight');
+    const gridSettings = calendarConfig.getGridSettings();
+    const hourHeight = gridSettings.hourHeight;
     const minuteHeight = hourHeight / 60;
-    const snapInterval = calendarConfig.get('snapInterval');
-    const dayStartHour = calendarConfig.get('dayStartHour');
+    const snapInterval = gridSettings.snapInterval;
+    const dayStartHour = gridSettings.dayStartHour;
     
     // Calculate total minutes from day start
     let totalMinutes = Math.floor(y / minuteHeight);
@@ -446,8 +507,9 @@ export class GridManager {
   scrollToHour(hour: number): void {
     if (!this.grid) return;
     
-    const hourHeight = calendarConfig.get('hourHeight');
-    const dayStartHour = calendarConfig.get('dayStartHour');
+    const gridSettings = calendarConfig.getGridSettings();
+    const hourHeight = gridSettings.hourHeight;
+    const dayStartHour = gridSettings.dayStartHour;
     const headerHeight = 80; // Header row height
     const scrollTop = headerHeight + ((hour - dayStartHour) * hourHeight);
     

src/managers/NavigationManager.ts

@@ -13,6 +13,7 @@ export class NavigationManager {
   private animationQueue: number = 0;
 
   constructor(eventBus: IEventBus) {
+    console.log('🧭 NavigationManager: Constructor called');
     this.eventBus = eventBus;
     this.currentWeek = DateUtils.getWeekStart(new Date(), 0); // Sunday start like POC
     this.targetWeek = new Date(this.currentWeek);
@@ -21,10 +22,17 @@ export class NavigationManager {
 
   private init(): void {
     this.setupEventListeners();
-    this.updateWeekInfo();
+    // Don't update week info immediately - wait for DOM to be ready
+    console.log('NavigationManager: Waiting for CALENDAR_INITIALIZED before updating DOM');
   }
 
   private setupEventListeners(): void {
+    // Initial DOM update when calendar is initialized
+    this.eventBus.on(EventTypes.CALENDAR_INITIALIZED, () => {
+      console.log('NavigationManager: Received CALENDAR_INITIALIZED, updating week info');
+      this.updateWeekInfo();
+    });
+
     // Listen for navigation button clicks
     document.addEventListener('click', (e) => {
       const target = e.target as HTMLElement;
@@ -157,10 +165,16 @@ export class NavigationManager {
     
     if (weekNumberElement) {
       weekNumberElement.textContent = `Week ${weekNumber}`;
+      console.log('NavigationManager: Updated week number:', `Week ${weekNumber}`);
+    } else {
+      console.warn('NavigationManager: swp-week-number element not found in DOM');
     }
     
     if (dateRangeElement) {
       dateRangeElement.textContent = dateRange;
+      console.log('NavigationManager: Updated date range:', dateRange);
+    } else {
+      console.warn('NavigationManager: swp-date-range element not found in DOM');
     }
     
     // Notify other managers about week info update

src/managers/ScrollManager.ts

@@ -3,6 +3,7 @@
 import { eventBus } from '../core/EventBus';
 import { calendarConfig } from '../core/CalendarConfig';
 import { EventTypes } from '../constants/EventTypes';
+import { StateEvents } from '../types/CalendarState';
 
 /**
  * Manages scrolling functionality for the calendar using native scrollbars
@@ -15,6 +16,7 @@ export class ScrollManager {
   private resizeObserver: ResizeObserver | null = null;
 
   constructor() {
+    console.log('📜 ScrollManager: Constructor called');
     this.init();
   }
 
@@ -24,19 +26,29 @@ export class ScrollManager {
 
   private subscribeToEvents(): void {
     // Initialize scroll when grid is rendered
-    eventBus.on(EventTypes.GRID_RENDERED, () => {
+    eventBus.on(StateEvents.GRID_RENDERED, () => {
       console.log('ScrollManager: Received GRID_RENDERED event');
       this.setupScrolling();
     });
     
+    // Add safety check - if grid is already rendered when ScrollManager initializes
+    // This prevents race condition where GridManager renders before ScrollManager subscribes
+    //setTimeout(() => {
+    //  const existingGrid = document.querySelector('swp-calendar-container');
+    //  if (existingGrid && existingGrid.children.length > 0) {
+    //    console.log('ScrollManager: Grid already exists, setting up scrolling');
+    //    this.setupScrolling();
+    //  }
+    //}, 0);
+
     // Handle window resize
     window.addEventListener('resize', () => {
       this.updateScrollableHeight();
     });
 
     // Handle config updates for scrollbar styling
-    eventBus.on(EventTypes.CONFIG_UPDATE, (event: CustomEvent) => {
-      const { key } = event.detail;
+    eventBus.on(EventTypes.CONFIG_UPDATE, (event: Event) => {
+      const { key } = (event as CustomEvent).detail;
       if (key.startsWith('scrollbar')) {
         this.applyScrollbarStyling();
       }
@@ -131,8 +143,9 @@ export class ScrollManager {
    * Scroll to specific hour
    */
   scrollToHour(hour: number): void {
-    const hourHeight = calendarConfig.get('hourHeight');
-    const dayStartHour = calendarConfig.get('dayStartHour');
+    const gridSettings = calendarConfig.getGridSettings();
+    const hourHeight = gridSettings.hourHeight;
+    const dayStartHour = gridSettings.dayStartHour;
     const scrollTop = (hour - dayStartHour) * hourHeight;
     
     this.scrollTo(scrollTop);

src/types/CalendarState.ts

@@ -0,0 +1,170 @@
+// Calendar state management types
+
+/**
+ * Calendar initialization and runtime states
+ * Represents the progression from startup to ready state
+ */
+export enum CalendarState {
+    UNINITIALIZED = 'uninitialized',
+    INITIALIZING = 'initializing',
+    CONFIG_LOADED = 'config_loaded',
+    DATA_LOADING = 'data_loading', 
+    DATA_LOADED = 'data_loaded',
+    RENDERING = 'rendering',
+    RENDERED = 'rendered',
+    READY = 'ready',
+    ERROR = 'error'
+}
+
+/**
+ * State-driven events with clear progression and timing
+ */
+export const StateEvents = {
+    // Core lifecycle events
+    CALENDAR_STATE_CHANGED: 'calendar:state:changed',
+    
+    // Configuration phase
+    CONFIG_LOADING_STARTED: 'calendar:config:loading:started',
+    CONFIG_LOADED: 'calendar:config:loaded',
+    CONFIG_FAILED: 'calendar:config:failed',
+    
+    // Data loading phase (can run parallel with rendering setup)
+    DATA_LOADING_STARTED: 'calendar:data:loading:started',
+    DATA_LOADED: 'calendar:data:loaded',
+    DATA_FAILED: 'calendar:data:failed',
+    
+    // Rendering phase
+    RENDERING_STARTED: 'calendar:rendering:started',
+    DOM_STRUCTURE_READY: 'calendar:dom:structure:ready',
+    GRID_RENDERED: 'calendar:grid:rendered',
+    EVENTS_RENDERED: 'calendar:events:rendered',
+    RENDERING_COMPLETE: 'calendar:rendering:complete',
+    
+    // System ready
+    CALENDAR_READY: 'calendar:ready',
+    
+    // Error handling
+    CALENDAR_ERROR: 'calendar:error',
+    RECOVERY_ATTEMPTED: 'calendar:recovery:attempted',
+    RECOVERY_SUCCESS: 'calendar:recovery:success',
+    RECOVERY_FAILED: 'calendar:recovery:failed',
+    
+    // User interaction events (unchanged)
+    VIEW_CHANGE_REQUESTED: 'calendar:view:change:requested',
+    VIEW_CHANGED: 'calendar:view:changed',
+    NAVIGATION_REQUESTED: 'calendar:navigation:requested',
+    
+} as const;
+
+/**
+ * Standardized event payload structure
+ */
+export interface CalendarEvent {
+    type: string;
+    component: string;
+    timestamp: number;
+    data?: any;
+    error?: Error;
+    metadata?: {
+        duration?: number;
+        dependencies?: string[];
+        phase?: string;
+        retryCount?: number;
+    };
+}
+
+/**
+ * State change event payload
+ */
+export interface StateChangeEvent extends CalendarEvent {
+    type: typeof StateEvents.CALENDAR_STATE_CHANGED;
+    data: {
+        from: CalendarState;
+        to: CalendarState;
+        transitionValid: boolean;
+    };
+}
+
+/**
+ * Error event payload
+ */
+export interface ErrorEvent extends CalendarEvent {
+    type: typeof StateEvents.CALENDAR_ERROR;
+    error: Error;
+    data: {
+        failedComponent: string;
+        currentState: CalendarState;
+        canRecover: boolean;
+    };
+}
+
+/**
+ * Data loaded event payload
+ */
+export interface DataLoadedEvent extends CalendarEvent {
+    type: typeof StateEvents.DATA_LOADED;
+    data: {
+        eventCount: number;
+        calendarMode: 'date' | 'resource';
+        period: {
+            start: string;
+            end: string;
+        };
+    };
+}
+
+/**
+ * Grid rendered event payload  
+ */
+export interface GridRenderedEvent extends CalendarEvent {
+    type: typeof StateEvents.GRID_RENDERED;
+    data: {
+        columnCount: number;
+        rowCount?: number;
+        gridMode: 'date' | 'resource';
+        domElementsCreated: string[];
+    };
+}
+
+/**
+ * Valid state transitions map
+ * Defines which state transitions are allowed
+ */
+export const VALID_STATE_TRANSITIONS: Record<CalendarState, CalendarState[]> = {
+    [CalendarState.UNINITIALIZED]: [CalendarState.INITIALIZING, CalendarState.ERROR],
+    [CalendarState.INITIALIZING]: [CalendarState.CONFIG_LOADED, CalendarState.ERROR],
+    [CalendarState.CONFIG_LOADED]: [CalendarState.DATA_LOADING, CalendarState.RENDERING, CalendarState.ERROR],
+    [CalendarState.DATA_LOADING]: [CalendarState.DATA_LOADED, CalendarState.ERROR],
+    [CalendarState.DATA_LOADED]: [CalendarState.RENDERING, CalendarState.RENDERED, CalendarState.ERROR],
+    [CalendarState.RENDERING]: [CalendarState.RENDERED, CalendarState.ERROR],
+    [CalendarState.RENDERED]: [CalendarState.READY, CalendarState.ERROR],
+    [CalendarState.READY]: [CalendarState.DATA_LOADING, CalendarState.ERROR], // Allow refresh
+    [CalendarState.ERROR]: [CalendarState.INITIALIZING, CalendarState.CONFIG_LOADED] // Recovery paths
+};
+
+/**
+ * State phases for logical grouping
+ */
+export enum InitializationPhase {
+    STARTUP = 'startup',
+    CONFIGURATION = 'configuration', 
+    DATA_AND_DOM = 'data-and-dom',
+    EVENT_RENDERING = 'event-rendering',
+    FINALIZATION = 'finalization',
+    ERROR_RECOVERY = 'error-recovery'
+}
+
+/**
+ * Map states to their initialization phases
+ */
+export const STATE_TO_PHASE: Record<CalendarState, InitializationPhase> = {
+    [CalendarState.UNINITIALIZED]: InitializationPhase.STARTUP,
+    [CalendarState.INITIALIZING]: InitializationPhase.STARTUP,
+    [CalendarState.CONFIG_LOADED]: InitializationPhase.CONFIGURATION,
+    [CalendarState.DATA_LOADING]: InitializationPhase.DATA_AND_DOM,
+    [CalendarState.DATA_LOADED]: InitializationPhase.DATA_AND_DOM,
+    [CalendarState.RENDERING]: InitializationPhase.DATA_AND_DOM,
+    [CalendarState.RENDERED]: InitializationPhase.EVENT_RENDERING,
+    [CalendarState.READY]: InitializationPhase.FINALIZATION,
+    [CalendarState.ERROR]: InitializationPhase.ERROR_RECOVERY
+};

src/types/CalendarTypes.ts

@@ -1,11 +1,16 @@
 // Calendar type definitions
 
-export type ViewType = 'day' | 'week' | 'month';
-export type CalendarView = ViewType; // Alias for compatibility
+// Time period view types (how much time to display)
+export type ViewPeriod = 'day' | 'week' | 'month';
 
-export type CalendarType = 'date' | 'resource';
+// Calendar mode types (how to organize the data)
+export type CalendarMode = 'date' | 'resource';
 
-export type EventType = 'meeting' | 'meal' | 'work' | 'milestone';
+// Legacy aliases for backwards compatibility
+export type DateViewType = ViewPeriod;
+export type ViewType = DateViewType;
+export type CalendarView = ViewType;
+export type CalendarType = CalendarMode;
 
 export type SyncStatus = 'synced' | 'pending' | 'error';
 
@@ -27,37 +32,22 @@ export interface CalendarEvent {
   title: string;
   start: string; // ISO 8601
   end: string;   // ISO 8601
-  type: EventType;
+  type: string;  // Flexible event type - can be any string value
   allDay: boolean;
   syncStatus: SyncStatus;
+  
   // Resource information (only present in resource calendar mode)
-  resourceName?: string;
-  resourceDisplayName?: string;
-  resourceEmployeeId?: string;
+  resource?: {
+    name: string;
+    displayName: string;
+    employeeId: string;
+  };
+  
   recurringId?: string;
-  resources?: string[];
   metadata?: Record<string, any>;
 }
 
 export interface CalendarConfig {
-  // View settings
-  view: ViewType;
-  weekDays: number;            // 4-7 days for week view
-  firstDayOfWeek: number;      // 0 = Sunday, 1 = Monday
-  
-  // Time settings
-  dayStartHour: number;        // Calendar starts at hour
-  dayEndHour: number;          // Calendar ends at hour
-  workStartHour: number;       // Work hours start
-  workEndHour: number;         // Work hours end
-  snapInterval: number;        // Minutes: 5, 10, 15, 30, 60
-  
-  // Display settings
-  hourHeight: number;          // Pixels per hour
-  showCurrentTime: boolean;
-  showWorkHours: boolean;
-  fitToWidth: boolean;         // Fit columns to calendar width vs horizontal scroll
-  
   // Scrollbar styling
   scrollbarWidth: number;      // Width of scrollbar in pixels
   scrollbarColor: string;      // Scrollbar thumb color
@@ -116,7 +106,7 @@ export interface GridPosition {
 export interface Period {
   start: string;
   end: string;
-  view: ViewType;
+  mode?: CalendarMode; // Optional: which calendar mode this period is for
 }
 
 export interface EventData {
@@ -124,7 +114,30 @@ export interface EventData {
   meta: {
     start: string;
     end: string;
-    view: ViewType;
     total: number;
+    mode?: CalendarMode; // Which calendar mode this data is for
   };
 }
+
+/**
+ * Context interfaces for different calendar modes
+ */
+export interface DateModeContext {
+  mode: 'date';
+  currentWeek: Date;
+  period: ViewPeriod;
+  weekDays: number;
+  firstDayOfWeek: number;
+}
+
+export interface ResourceModeContext {
+  mode: 'resource';
+  selectedDate: Date;
+  resources: Resource[];
+  maxResources: number;
+}
+
+/**
+ * Union type for type-safe mode contexts
+ */
+export type CalendarModeContext = DateModeContext | ResourceModeContext;

src/utils/PositionUtils.ts

@@ -1,8 +1,8 @@
 import { CalendarConfig } from '../core/CalendarConfig.js';
 
 /**
- * PositionUtils - Utility funktioner til pixel/minut konvertering
- * Håndterer positionering og størrelse beregninger for calendar events
+ * PositionUtils - Utility functions for pixel/minute conversion
+ * Handles positioning and size calculations for calendar events
  */
 export class PositionUtils {
     private config: CalendarConfig;
@@ -12,41 +12,45 @@ export class PositionUtils {
     }
 
     /**
-     * Konverter minutter til pixels
+     * Convert minutes to pixels
      */
     public minutesToPixels(minutes: number): number {
-        const pixelsPerHour = this.config.get('hourHeight');
+        const gridSettings = this.config.getGridSettings();
+        const pixelsPerHour = gridSettings.hourHeight;
         return (minutes / 60) * pixelsPerHour;
     }
 
     /**
-     * Konverter pixels til minutter
+     * Convert pixels to minutes
      */
     public pixelsToMinutes(pixels: number): number {
-        const pixelsPerHour = this.config.get('hourHeight');
+        const gridSettings = this.config.getGridSettings();
+        const pixelsPerHour = gridSettings.hourHeight;
         return (pixels / pixelsPerHour) * 60;
     }
 
     /**
-     * Konverter tid (HH:MM) til pixels fra dag start
+     * Convert time (HH:MM) to pixels from day start
      */
     public timeToPixels(timeString: string): number {
         const [hours, minutes] = timeString.split(':').map(Number);
         const totalMinutes = (hours * 60) + minutes;
-        const dayStartMinutes = this.config.get('dayStartHour') * 60;
+        const gridSettings = this.config.getGridSettings();
+        const dayStartMinutes = gridSettings.dayStartHour * 60;
         const minutesFromDayStart = totalMinutes - dayStartMinutes;
         
         return this.minutesToPixels(minutesFromDayStart);
     }
 
     /**
-     * Konverter Date object til pixels fra dag start
+     * Convert Date object to pixels from day start
      */
     public dateToPixels(date: Date): number {
         const hours = date.getHours();
         const minutes = date.getMinutes();
         const totalMinutes = (hours * 60) + minutes;
-        const dayStartMinutes = this.config.get('dayStartHour') * 60;
+        const gridSettings = this.config.getGridSettings();
+        const dayStartMinutes = gridSettings.dayStartHour * 60;
         const minutesFromDayStart = totalMinutes - dayStartMinutes;
         
         return this.minutesToPixels(minutesFromDayStart);
@@ -57,7 +61,8 @@ export class PositionUtils {
      */
     public pixelsToTime(pixels: number): string {
         const minutes = this.pixelsToMinutes(pixels);
-        const dayStartMinutes = this.config.get('dayStartHour') * 60;
+        const gridSettings = this.config.getGridSettings();
+        const dayStartMinutes = gridSettings.dayStartHour * 60;
         const totalMinutes = dayStartMinutes + minutes;
         
         const hours = Math.floor(totalMinutes / 60);
@@ -103,7 +108,8 @@ export class PositionUtils {
      * Snap position til grid interval
      */
     public snapToGrid(pixels: number): number {
-        const snapInterval = this.config.get('snapInterval');
+        const gridSettings = this.config.getGridSettings();
+        const snapInterval = gridSettings.snapInterval;
         const snapPixels = this.minutesToPixels(snapInterval);
         
         return Math.round(pixels / snapPixels) * snapPixels;
@@ -115,7 +121,8 @@ export class PositionUtils {
     public snapTimeToInterval(timeString: string): string {
         const [hours, minutes] = timeString.split(':').map(Number);
         const totalMinutes = (hours * 60) + minutes;
-        const snapInterval = this.config.get('snapInterval');
+        const gridSettings = this.config.getGridSettings();
+        const snapInterval = gridSettings.snapInterval;
         
         const snappedMinutes = Math.round(totalMinutes / snapInterval) * snapInterval;
         const snappedHours = Math.floor(snappedMinutes / 60);
@@ -186,7 +193,8 @@ export class PositionUtils {
      */
     public isWithinWorkHours(timeString: string): boolean {
         const [hours] = timeString.split(':').map(Number);
-        return hours >= this.config.get('workStartHour') && hours < this.config.get('workEndHour');
+        const gridSettings = this.config.getGridSettings();
+        return hours >= gridSettings.workStartHour && hours < gridSettings.workEndHour;
     }
 
     /**
@@ -194,7 +202,8 @@ export class PositionUtils {
      */
     public isWithinDayBounds(timeString: string): boolean {
         const [hours] = timeString.split(':').map(Number);
-        return hours >= this.config.get('dayStartHour') && hours < this.config.get('dayEndHour');
+        const gridSettings = this.config.getGridSettings();
+        return hours >= gridSettings.dayStartHour && hours < gridSettings.dayEndHour;
     }
 
     /**
@@ -209,8 +218,9 @@ export class PositionUtils {
      * Hent maksimum event højde i pixels (hele dagen)
      */
     public getMaximumEventHeight(): number {
-        const dayDurationHours = this.config.get('dayEndHour') - this.config.get('dayStartHour');
-        return dayDurationHours * this.config.get('hourHeight');
+        const gridSettings = this.config.getGridSettings();
+        const dayDurationHours = gridSettings.dayEndHour - gridSettings.dayStartHour;
+        return dayDurationHours * gridSettings.hourHeight;
     }
 
     /**