Refactor renderer interfaces and update type names

Renames renderer interfaces to use 'I' prefix for clarity
Updates type references across related files
Improves type consistency in rendering strategies

src/index.ts

@@ -22,9 +22,9 @@ import { HeaderManager } from './managers/HeaderManager';
 import { ConfigManager } from './managers/ConfigManager';
 
 // Import renderers
-import { DateHeaderRenderer, type HeaderRenderer } from './renderers/HeaderRenderer';
+import { DateHeaderRenderer, type IHeaderRenderer } from './renderers/DateHeaderRenderer';
 import { DateColumnRenderer, type ColumnRenderer } from './renderers/ColumnRenderer';
-import { DateEventRenderer, type EventRendererStrategy } from './renderers/EventRenderer';
+import { DateEventRenderer, type IEventRenderer } from './renderers/EventRenderer';
 import { AllDayEventRenderer } from './renderers/AllDayEventRenderer';
 import { GridRenderer } from './renderers/GridRenderer';
 import { NavigationRenderer } from './renderers/NavigationRenderer';
@@ -87,9 +87,9 @@ async function initializeCalendar(): Promise<void> {
     builder.registerInstance(eventBus).as<IEventBus>();
 
     // Register renderers
-    builder.registerType(DateHeaderRenderer).as<HeaderRenderer>().singleInstance();
+    builder.registerType(DateHeaderRenderer).as<IHeaderRenderer>().singleInstance();
     builder.registerType(DateColumnRenderer).as<ColumnRenderer>().singleInstance();
-    builder.registerType(DateEventRenderer).as<EventRendererStrategy>().singleInstance();
+    builder.registerType(DateEventRenderer).as<IEventRenderer>().singleInstance();
 
     // Register core services and utilities
     builder.registerType(DateService).as<DateService>().singleInstance();

src/managers/HeaderManager.ts

@@ -1,7 +1,7 @@
 import { eventBus } from '../core/EventBus';
 import { CalendarConfig } from '../core/CalendarConfig';
 import { CoreEvents } from '../constants/CoreEvents';
-import { HeaderRenderer, HeaderRenderContext } from '../renderers/HeaderRenderer';
+import { IHeaderRenderer, HeaderRenderContext } from '../renderers/DateHeaderRenderer';
 import { DragMouseEnterHeaderEventPayload, DragMouseLeaveHeaderEventPayload, HeaderReadyEventPayload } from '../types/EventTypes';
 import { ColumnDetectionUtils } from '../utils/ColumnDetectionUtils';
 
@@ -11,10 +11,10 @@ import { ColumnDetectionUtils } from '../utils/ColumnDetectionUtils';
  * Uses dependency injection for renderer strategy
  */
 export class HeaderManager {
-  private headerRenderer: HeaderRenderer;
+  private headerRenderer: IHeaderRenderer;
   private config: CalendarConfig;
 
-  constructor(headerRenderer: HeaderRenderer, config: CalendarConfig) {
+  constructor(headerRenderer: IHeaderRenderer, config: CalendarConfig) {
     this.headerRenderer = headerRenderer;
     this.config = config;
 

src/renderers/AllDayEventRenderer.ts

@@ -4,7 +4,7 @@ import { EventLayout } from '../utils/AllDayLayoutEngine';
 import { ColumnBounds } from '../utils/ColumnDetectionUtils';
 import { EventManager } from '../managers/EventManager';
 import { DragStartEventPayload } from '../types/EventTypes';
-import { EventRendererStrategy } from './EventRenderer';
+import { IEventRenderer } from './EventRenderer';
 
 export class AllDayEventRenderer {
 

src/renderers/DateHeaderRenderer.ts

@@ -6,7 +6,7 @@ import { DateService } from '../utils/DateService';
 /**
  * Interface for header rendering strategies
  */
-export interface HeaderRenderer {
+export interface IHeaderRenderer {
   render(calendarHeader: HTMLElement, context: HeaderRenderContext): void;
 }
 
@@ -22,7 +22,7 @@ export interface HeaderRenderContext {
 /**
  * Date-based header renderer (original functionality)
  */
-export class DateHeaderRenderer implements HeaderRenderer {
+export class DateHeaderRenderer implements IHeaderRenderer {
   private dateService!: DateService;
 
   render(calendarHeader: HTMLElement, context: HeaderRenderContext): void {
@@ -33,8 +33,8 @@ export class DateHeaderRenderer implements HeaderRenderer {
     calendarHeader.appendChild(allDayContainer);
 
     // Initialize date service with timezone and locale from config
-    const timezone = config.getTimezone?.() || 'Europe/Copenhagen';
+    const timezone = config.getTimezone();
-    const locale = config.getLocale?.() || 'da-DK';
+    const locale = config.getLocale();
     this.dateService = new DateService(config);
 
     const workWeekSettings = config.getWorkWeekSettings();

src/renderers/EventRenderer.ts

@@ -13,7 +13,7 @@ import { EventLayoutCoordinator, GridGroupLayout, StackedEventLayout } from '../
 /**
  * Interface for event rendering strategies
  */
-export interface EventRendererStrategy {
+export interface IEventRenderer {
   renderEvents(events: CalendarEvent[], container: HTMLElement): void;
   clearEvents(container?: HTMLElement): void;
   handleDragStart?(payload: DragStartEventPayload): void;
@@ -29,7 +29,7 @@ export interface EventRendererStrategy {
 /**
  * Date-based event renderer
  */
-export class DateEventRenderer implements EventRendererStrategy {
+export class DateEventRenderer implements IEventRenderer {
 
   private dateService: DateService;
   private stackManager: EventStackManager;

src/renderers/EventRendererManager.ts

@@ -2,7 +2,7 @@ import { EventBus } from '../core/EventBus';
 import { IEventBus, CalendarEvent, RenderContext } from '../types/CalendarTypes';
 import { CoreEvents } from '../constants/CoreEvents';
 import { EventManager } from '../managers/EventManager';
-import { EventRendererStrategy } from './EventRenderer';
+import { IEventRenderer } from './EventRenderer';
 import { SwpEventElement } from '../elements/SwpEventElement';
 import { DragStartEventPayload, DragMoveEventPayload, DragEndEventPayload, DragMouseEnterHeaderEventPayload, DragMouseLeaveHeaderEventPayload, DragMouseEnterColumnEventPayload, DragColumnChangeEventPayload, HeaderReadyEventPayload, ResizeEndEventPayload } from '../types/EventTypes';
 import { DateService } from '../utils/DateService';
@@ -14,7 +14,7 @@ import { ColumnBounds } from '../utils/ColumnDetectionUtils';
 export class EventRenderingService {
     private eventBus: IEventBus;
     private eventManager: EventManager;
-    private strategy: EventRendererStrategy;
+    private strategy: IEventRenderer;
     private dateService: DateService;
 
     private dragMouseLeaveHeaderListener: ((event: Event) => void) | null = null;
@@ -22,7 +22,7 @@ export class EventRenderingService {
     constructor(
         eventBus: IEventBus,
         eventManager: EventManager,
-        strategy: EventRendererStrategy,
+        strategy: IEventRenderer,
         dateService: DateService
     ) {
         this.eventBus = eventBus;

src/renderers/GridRenderer.ts

@@ -7,8 +7,76 @@ import { CoreEvents } from '../constants/CoreEvents';
 import { TimeFormatter } from '../utils/TimeFormatter';
 
 /**
- * GridRenderer - Centralized DOM rendering for calendar grid
+ * GridRenderer - Centralized DOM rendering for calendar grid structure
- * Optimized to reduce redundant DOM operations and improve performance
+ *
+ * ARCHITECTURE OVERVIEW:
+ * =====================
+ * GridRenderer is responsible for creating and managing the complete DOM structure
+ * of the calendar grid. It follows the Strategy Pattern by delegating specific
+ * rendering tasks to specialized renderers (DateHeaderRenderer, ColumnRenderer).
+ *
+ * RESPONSIBILITY HIERARCHY:
+ * ========================
+ * GridRenderer (this file)
+ * ├─ Creates overall grid skeleton
+ * ├─ Manages time axis (hour markers)
+ * └─ Delegates to specialized renderers:
+ *    ├─ DateHeaderRenderer → Renders date headers
+ *    └─ ColumnRenderer → Renders day columns
+ *
+ * DOM STRUCTURE CREATED:
+ * =====================
+ * <swp-calendar-container>
+ *   <swp-header-spacer />                    ← GridRenderer
+ *   <swp-time-axis>                          ← GridRenderer
+ *     <swp-hour-marker>00:00</...>           ← GridRenderer (iterates hours)
+ *   </swp-time-axis>
+ *   <swp-grid-container>                     ← GridRenderer
+ *     <swp-calendar-header>                  ← GridRenderer creates container
+ *       <swp-day-header />                   ← DateHeaderRenderer (iterates dates)
+ *     </swp-calendar-header>
+ *     <swp-scrollable-content>               ← GridRenderer
+ *       <swp-time-grid>                      ← GridRenderer
+ *         <swp-grid-lines />                 ← GridRenderer
+ *         <swp-day-columns>                  ← GridRenderer creates container
+ *           <swp-day-column />               ← ColumnRenderer (iterates dates)
+ *         </swp-day-columns>
+ *       </swp-time-grid>
+ *     </swp-scrollable-content>
+ *   </swp-grid-container>
+ * </swp-calendar-container>
+ *
+ * RENDERING FLOW:
+ * ==============
+ * 1. renderGrid() - Entry point called by GridManager
+ *    ├─ First render: createCompleteGridStructure()
+ *    └─ Updates: updateGridContent()
+ *
+ * 2. createCompleteGridStructure()
+ *    ├─ Creates header spacer
+ *    ├─ Creates time axis (calls createOptimizedTimeAxis)
+ *    └─ Creates grid container (calls createOptimizedGridContainer)
+ *
+ * 3. createOptimizedGridContainer()
+ *    ├─ Creates calendar header container
+ *    ├─ Creates scrollable content structure
+ *    └─ Creates column container (calls renderColumnContainer)
+ *
+ * 4. renderColumnContainer()
+ *    └─ Delegates to ColumnRenderer.render()
+ *       └─ ColumnRenderer iterates dates and creates columns
+ *
+ * OPTIMIZATION STRATEGY:
+ * =====================
+ * - Caches DOM references (cachedGridContainer, cachedTimeAxis)
+ * - Uses DocumentFragment for batch DOM insertions
+ * - Only updates changed content on re-renders
+ * - Delegates specialized tasks to strategy renderers
+ *
+ * USAGE EXAMPLE:
+ * =============
+ * const gridRenderer = new GridRenderer(columnRenderer, dateService, config);
+ * gridRenderer.renderGrid(containerElement, new Date(), 'week');
  */
 export class GridRenderer {
   private cachedGridContainer: HTMLElement | null = null;
@@ -27,6 +95,16 @@ export class GridRenderer {
     this.config = config;
   }
 
+  /**
+   * Main entry point for rendering the complete calendar grid
+   *
+   * This method decides between full render (first time) or optimized update.
+   * It caches the grid reference for performance.
+   *
+   * @param grid - Container element where grid will be rendered
+   * @param currentDate - Base date for the current view (e.g., any date in the week)
+   * @param view - Calendar view type (day/week/month)
+   */
   public renderGrid(
     grid: HTMLElement,
     currentDate: Date,
@@ -43,8 +121,6 @@ export class GridRenderer {
     // Only clear and rebuild if grid is empty (first render)
     if (grid.children.length === 0) {
       this.createCompleteGridStructure(grid, currentDate, view);
-      // Setup grid-related event listeners on first render
-      // this.setupGridEventListeners();
     } else {
       // Optimized update - only refresh dynamic content
       this.updateGridContent(grid, currentDate, view);
@@ -52,7 +128,19 @@ export class GridRenderer {
   }
 
   /**
-   * Create complete grid structure in one operation
+   * Creates the complete grid structure from scratch
+   *
+   * Uses DocumentFragment for optimal performance by minimizing reflows.
+   * Creates all child elements in memory first, then appends everything at once.
+   *
+   * Structure created:
+   * 1. Header spacer (placeholder for alignment)
+   * 2. Time axis (hour markers 00:00-23:00)
+   * 3. Grid container (header + scrollable content)
+   *
+   * @param grid - Parent container
+   * @param currentDate - Current view date
+   * @param view - View type
    */
   private createCompleteGridStructure(
     grid: HTMLElement,
@@ -80,6 +168,14 @@ export class GridRenderer {
     grid.appendChild(fragment);
   }
 
+  /**
+   * Creates the time axis with hour markers
+   *
+   * Iterates from dayStartHour to dayEndHour (configured in GridSettings).
+   * Each marker shows the hour in the configured time format.
+   *
+   * @returns Time axis element with all hour markers
+   */
   private createOptimizedTimeAxis(): HTMLElement {
     const timeAxis = document.createElement('swp-time-axis');
     const timeAxisContent = document.createElement('swp-time-axis-content');
@@ -96,11 +192,23 @@ export class GridRenderer {
     }
 
     timeAxisContent.appendChild(fragment);
-    timeAxisContent.style.top = '-1px';
+    timeAxisContent.style.top = '-1px'; 
     timeAxis.appendChild(timeAxisContent);
     return timeAxis;
   }
 
+  /**
+   * Creates the main grid container with header and columns
+   *
+   * This is the scrollable area containing:
+   * - Calendar header (dates/resources) - created here, populated by DateHeaderRenderer
+   * - Time grid (grid lines + day columns) - structure created here
+   * - Column container - created here, populated by ColumnRenderer
+   *
+   * @param currentDate - Current view date
+   * @param view - View type
+   * @returns Complete grid container element
+   */
   private createOptimizedGridContainer(
     currentDate: Date,
     view: CalendarView
@@ -127,14 +235,20 @@ export class GridRenderer {
     scrollableContent.appendChild(timeGrid);
     gridContainer.appendChild(scrollableContent);
 
-    console.log('✅ GridRenderer: Created grid container with header');
-
     return gridContainer;
   }
 
 
   /**
-   * Render column container with view awareness
+   * Delegates column rendering to the injected ColumnRenderer strategy
+   *
+   * This is where the Strategy Pattern is applied:
+   * - DateColumnRenderer iterates dates and creates day columns
+   * - Could be swapped with other implementations (e.g., ResourceColumnRenderer)
+   *
+   * @param columnContainer - Empty container to populate
+   * @param currentDate - Current view date
+   * @param view - View type
    */
   private renderColumnContainer(
     columnContainer: HTMLElement,
@@ -151,6 +265,13 @@ export class GridRenderer {
 
   /**
    * Optimized update of grid content without full rebuild
+   *
+   * Only updates the column container content, leaving the structure intact.
+   * This is much faster than recreating the entire grid.
+   *
+   * @param grid - Existing grid element
+   * @param currentDate - New view date
+   * @param view - View type
    */
   private updateGridContent(
     grid: HTMLElement,
@@ -165,17 +286,18 @@ export class GridRenderer {
     }
   }
   /**
-   * Create navigation grid container for slide animations
+   * Creates a new grid for slide animations during navigation
-   * Now uses same implementation as initial load for consistency
+   *
+   * Used by NavigationManager for smooth week-to-week transitions.
+   * Creates a complete grid positioned absolutely for animation.
+   *
+   * Note: Positioning is handled by Animation API, not here.
+   *
+   * @param parentContainer - Container for the new grid
+   * @param weekStart - Start date of the new week
+   * @returns New grid element ready for animation
    */
   public createNavigationGrid(parentContainer: HTMLElement, weekStart: Date): HTMLElement {
-    console.group('🔧 GridRenderer.createNavigationGrid');
-    console.log('Week start:', weekStart);
-    console.log('Parent container:', parentContainer);
-    console.log('Using same grid creation as initial load');
-
-    const weekEnd = this.dateService.addDays(weekStart, 6);
-
     // Use SAME method as initial load - respects workweek settings
     const newGrid = this.createOptimizedGridContainer(weekStart, 'week');
 
@@ -189,10 +311,6 @@ export class GridRenderer {
     // Add to parent container
     parentContainer.appendChild(newGrid);
 
-    console.log('Grid created using createOptimizedGridContainer:', newGrid);
-    console.log('Grid creation complete - caller will emit GRID_RENDERED');
-
-    console.groupEnd();
     return newGrid;
   }
 }