Calendar/src/renderers/EventRendererManager.ts

import { EventBus } from '../core/EventBus';
import { IEventBus, CalendarEvent, RenderContext } from '../types/CalendarTypes';
import { CoreEvents } from '../constants/CoreEvents';
import { calendarConfig } from '../core/CalendarConfig';
import { CalendarTypeFactory } from '../factories/CalendarTypeFactory';
import { EventManager } from '../managers/EventManager';
import { EventRendererStrategy } from './EventRenderer';
import { SwpEventElement } from '../elements/SwpEventElement';
import { DragStartEventPayload, DragMoveEventPayload, DragEndEventPayload, DragMouseEnterHeaderEventPayload, DragMouseLeaveHeaderEventPayload, DragColumnChangeEventPayload, HeaderReadyEventPayload } from '../types/EventTypes';
/**
 * EventRenderingService - Render events i DOM med positionering using Strategy Pattern
 * Håndterer event positioning og overlap detection
 */
export class EventRenderingService {
    private eventBus: IEventBus;
    private eventManager: EventManager;
    private strategy: EventRendererStrategy;

    private dragMouseLeaveHeaderListener: ((event: Event) => void) | null = null;

    constructor(eventBus: IEventBus, eventManager: EventManager) {
        this.eventBus = eventBus;
        this.eventManager = eventManager;

        // Cache strategy at initialization
        const calendarType = calendarConfig.getCalendarMode();
        this.strategy = CalendarTypeFactory.getEventRenderer(calendarType);

        this.setupEventListeners();
    }

    /**
     * Render events in a specific container for a given period
     */
    public renderEvents(context: RenderContext): void {
        // Clear existing events in the specific container first
        this.strategy.clearEvents(context.container);

        // Get events from EventManager for the period
        const events = this.eventManager.getEventsForPeriod(
            context.startDate,
            context.endDate
        );

        if (events.length === 0) {
            return;
        }

        // Filter events by type - only render timed events here
        const timedEvents = events.filter(event => !event.allDay);

        console.log('🎯 EventRenderingService: Event filtering', {
            totalEvents: events.length,
            timedEvents: timedEvents.length,
            allDayEvents: events.length - timedEvents.length
        });

        // Render timed events using existing strategy
        if (timedEvents.length > 0) {
            this.strategy.renderEvents(timedEvents, context.container);
        }

        // Emit EVENTS_RENDERED event for filtering system
        this.eventBus.emit(CoreEvents.EVENTS_RENDERED, {
            events: events,
            container: context.container
        });
    }

    private setupEventListeners(): void {

        this.eventBus.on(CoreEvents.GRID_RENDERED, (event: Event) => {
            this.handleGridRendered(event as CustomEvent);
        });

        this.eventBus.on(CoreEvents.VIEW_CHANGED, (event: Event) => {
            this.handleViewChanged(event as CustomEvent);
        });


        // Handle all drag events and delegate to appropriate renderer
        this.setupDragEventListeners();

        // Listen for conversion from all-day event to time event
        this.eventBus.on('drag:convert-to-time_event', (event: Event) => {
            const { draggedElement, mousePosition, column } = (event as CustomEvent).detail;
            console.log('🔄 EventRendererManager: Received drag:convert-to-time_event', {
                draggedElement: draggedElement?.dataset.eventId,
                mousePosition,
                column
            });
            this.handleConvertToTimeEvent(draggedElement, mousePosition, column);
        });

    }


    /**
     * Handle GRID_RENDERED event - render events in the current grid
     */
    private handleGridRendered(event: CustomEvent): void {
        const { container, startDate, endDate, currentDate, isNavigation } = event.detail;

        if (!container) {
            return;
        }


        let periodStart: Date;
        let periodEnd: Date;

        if (startDate && endDate) {
            // Direct date format - use as provided
            periodStart = startDate;
            periodEnd = endDate;
        } else if (currentDate) {
            return;
        } else {
            return;
        }

        this.renderEvents({
            container: container,
            startDate: periodStart,
            endDate: periodEnd
        });
    }


    /**
     * Handle VIEW_CHANGED event - clear and re-render for new view
     */
    private handleViewChanged(event: CustomEvent): void {
        // Clear all existing events since view structure may have changed
        this.clearEvents();

        // New rendering will be triggered by subsequent GRID_RENDERED event
    }


    /**
     * Setup all drag event listeners - moved from EventRenderer for better separation of concerns
     */
    private setupDragEventListeners(): void {
        this.eventBus.on('drag:start', (event: Event) => {
            const dragStartPayload = (event as CustomEvent<DragStartEventPayload>).detail;
            
            if (dragStartPayload.draggedElement.hasAttribute('data-allday')) {
                return; 
            }

            if (dragStartPayload.draggedElement && this.strategy.handleDragStart && dragStartPayload.columnBounds) {
                this.strategy.handleDragStart(dragStartPayload);
            }
        });

        this.eventBus.on('drag:move', (event: Event) => {
            let dragEvent = (event as CustomEvent<DragMoveEventPayload>).detail;

            if (dragEvent.draggedElement.hasAttribute('data-allday')) {
                return;  
            }
            if (this.strategy.handleDragMove) {
                this.strategy.handleDragMove(dragEvent);
            }
        });

        this.eventBus.on('drag:auto-scroll', (event: Event) => {
            const { draggedElement, snappedY } = (event as CustomEvent).detail;
            if (this.strategy.handleDragAutoScroll) {
                const eventId = draggedElement.dataset.eventId || '';
                this.strategy.handleDragAutoScroll(eventId, snappedY);
            }
        });

        // Handle drag end events and delegate to appropriate renderer
        this.eventBus.on('drag:end', (event: Event) => {
            const { originalElement: draggedElement, finalPosition, target } = (event as CustomEvent<DragEndEventPayload>).detail;
            const finalColumn = finalPosition.column;
            const finalY = finalPosition.snappedY;
            const eventId = draggedElement.dataset.eventId || '';

            // Only handle day column drops for EventRenderer
            if (target === 'swp-day-column' && finalColumn) {
                // Find dragged clone - use draggedElement as original
                const draggedClone = document.querySelector(`swp-day-column swp-event[data-event-id="clone-${eventId}"]`) as HTMLElement;

                if (draggedElement && draggedClone && this.strategy.handleDragEnd) {
                    this.strategy.handleDragEnd(eventId, draggedElement, draggedClone, finalColumn, finalY);
                }
            }

            // Clean up any remaining day event clones
            const dayEventClone = document.querySelector(`swp-day-column swp-event[data-event-id="clone-${eventId}"]`);
            if (dayEventClone) {
                dayEventClone.remove();
            }
        });

        // Handle column change
        this.eventBus.on('drag:column-change', (event: Event) => {
            let columnChangeEvent = (event as CustomEvent<DragColumnChangeEventPayload>).detail;

            // Filter: Only handle events where clone is NOT an all-day event (normal timed events)
            if (columnChangeEvent.draggedClone && columnChangeEvent.draggedClone.hasAttribute('data-allday')) {
                return;
            }

            if (this.strategy.handleColumnChange) {
                this.strategy.handleColumnChange(columnChangeEvent);
            }
        });


        this.dragMouseLeaveHeaderListener = (event: Event) => {
            const { targetDate, mousePosition, originalElement, draggedClone: cloneElement } = (event as CustomEvent<DragMouseLeaveHeaderEventPayload>).detail;

            if (cloneElement)
                cloneElement.style.display = '';

            console.log('🚪 EventRendererManager: Received drag:mouseleave-header', {
                targetDate,
                originalElement: originalElement,
                cloneElement: cloneElement
            });

        };

        this.eventBus.on('drag:mouseleave-header', this.dragMouseLeaveHeaderListener);

        // Handle navigation period change
        this.eventBus.on(CoreEvents.NAVIGATION_COMPLETED, () => {
            // Delegate to strategy if it handles navigation
            if (this.strategy.handleNavigationCompleted) {
                this.strategy.handleNavigationCompleted();
            }
        });
    }

    /**
     * Handle conversion from all-day event to time event
     */
    private handleConvertToTimeEvent(draggedElement: HTMLElement, mousePosition: { x: number; y: number }, column: string): void {
        // Use the provided draggedElement directly
        const allDayClone = draggedElement;
        const draggedEventId = draggedElement?.dataset.eventId?.replace('clone-', '') || '';


        // Use SwpEventElement factory to create day event from all-day event
        const dayElement = SwpEventElement.fromAllDayElement(allDayClone as HTMLElement);

        // Remove the all-day clone - it's no longer needed since we're converting to day event
        allDayClone.remove();

        // Set clone ID
        dayElement.dataset.eventId = `clone-${draggedEventId}`;

        // Find target column
        const columnElement = document.querySelector(`swp-day-column[data-date="${column}"]`);
        if (!columnElement) {
            console.warn('EventRendererManager: Target column not found', { column });
            return;
        }

        // Find events layer in the column
        const eventsLayer = columnElement.querySelector('swp-events-layer');
        if (!eventsLayer) {
            console.warn('EventRendererManager: Events layer not found in column');
            return;
        }

        // Add to events layer
        eventsLayer.appendChild(dayElement);

        // Position based on mouse Y coordinate
        const columnRect = columnElement.getBoundingClientRect();
        const relativeY = Math.max(0, mousePosition.y - columnRect.top);
        dayElement.style.top = `${relativeY}px`;

        // Set drag styling
        dayElement.style.zIndex = '1000';
        dayElement.style.cursor = 'grabbing';
        dayElement.style.opacity = '';
        dayElement.style.transform = '';

        console.log('✅ EventRendererManager: Converted all-day event to time event', {
            draggedEventId,
            column,
            mousePosition,
            relativeY
        });
    }

    private clearEvents(container?: HTMLElement): void {
        this.strategy.clearEvents(container);
    }

    public refresh(container?: HTMLElement): void {
        this.clearEvents(container);
    }
}