// All-day row height management and animations

import { eventBus } from '../core/EventBus';
import { ALL_DAY_CONSTANTS } from '../core/CalendarConfig';
import { AllDayEventRenderer } from '../renderers/AllDayEventRenderer';
import { CalendarEvent } from '../types/CalendarTypes';

/**
 * AllDayManager - Handles all-day row height animations and management
 * Separated from HeaderManager for clean responsibility separation
 */
export class AllDayManager {
  private cachedAllDayContainer: HTMLElement | null = null;
  private cachedCalendarHeader: HTMLElement | null = null;
  private cachedHeaderSpacer: HTMLElement | null = null;
  private allDayEventRenderer: AllDayEventRenderer;

  constructor() {
    // Bind methods for event listeners
    this.checkAndAnimateAllDayHeight = this.checkAndAnimateAllDayHeight.bind(this);
    this.allDayEventRenderer = new AllDayEventRenderer();

    // Listen for drag-to-allday conversions
    this.setupEventListeners();
  }

  /**
   * Setup event listeners for drag conversions
   */
  private setupEventListeners(): void {
    eventBus.on('drag:convert-to-allday_event', (event) => {
      const { targetDate, originalElement } = (event as CustomEvent).detail;
      console.log('🔄 AllDayManager: Received drag:convert-to-allday_event', {
        targetDate,
        originalElementId: originalElement?.dataset?.eventId,
        originalElementTag: originalElement?.tagName
      });
      this.handleConvertToAllDay(targetDate, originalElement);
    });


    // Listen for requests to ensure all-day container exists
    eventBus.on('allday:ensure-container', () => {
      console.log('🏗️ AllDayManager: Received request to ensure all-day container exists');
      this.ensureAllDayContainer();
    });

    // Listen for header mouseleave to recalculate all-day container height
    eventBus.on('header:mouseleave', () => {
      console.log('🔄 AllDayManager: Received header:mouseleave, recalculating height');
      this.checkAndAnimateAllDayHeight();
    });

    // Listen for drag operations on all-day events
    eventBus.on('drag:start', (event) => {
      const { eventId, mouseOffset } = (event as CustomEvent).detail;

      // Check if this is an all-day event
      const originalElement = document.querySelector(`swp-allday-container swp-allday-event[data-event-id="${eventId}"]`);
      if (!originalElement) return; // Not an all-day event

      console.log('🎯 AllDayManager: Starting drag for all-day event', { eventId });
      this.handleDragStart(originalElement as HTMLElement, eventId, mouseOffset);
    });

    eventBus.on('drag:move', (event) => {
      const { eventId, mousePosition } = (event as CustomEvent).detail;

      // Only handle for all-day events
      const dragClone = document.querySelector(`swp-allday-container swp-allday-event[data-event-id="clone-${eventId}"]`);
      if (dragClone) {
        this.handleDragMove(dragClone as HTMLElement, mousePosition);
      }
    });

    eventBus.on('drag:end', (event) => {

      const { eventId, finalColumn, finalY, dropTarget } = (event as CustomEvent).detail;

      if (dropTarget != 'SWP-DAY-HEADER')//we are not inside the swp-day-header, so just ignore.
        return;

      console.log('🎬 AllDayManager: Received drag:end', {
        eventId: eventId,
        finalColumn: finalColumn,
        finalY: finalY
      });

      // Check if this was an all-day event
      const originalElement = document.querySelector(`swp-allday-container swp-allday-event[data-event-id="${eventId}"]`);
      const dragClone = document.querySelector(`swp-allday-container swp-allday-event[data-event-id="clone-${eventId}"]`);



      console.log('🎯 AllDayManager: Ending drag for all-day event', { eventId });
      this.handleDragEnd(originalElement as HTMLElement, dragClone as HTMLElement, finalColumn);
    });
  }

  /**
   * Get cached all-day container element
   */
  private getAllDayContainer(): HTMLElement | null {
    if (!this.cachedAllDayContainer) {
      const calendarHeader = this.getCalendarHeader();
      if (calendarHeader) {
        this.cachedAllDayContainer = calendarHeader.querySelector('swp-allday-container');
      }
    }
    return this.cachedAllDayContainer;
  }

  /**
   * Get cached calendar header element
   */
  private getCalendarHeader(): HTMLElement | null {
    if (!this.cachedCalendarHeader) {
      this.cachedCalendarHeader = document.querySelector('swp-calendar-header');
    }
    return this.cachedCalendarHeader;
  }

  /**
   * Get cached header spacer element
   */
  private getHeaderSpacer(): HTMLElement | null {
    if (!this.cachedHeaderSpacer) {
      this.cachedHeaderSpacer = document.querySelector('swp-header-spacer');
    }
    return this.cachedHeaderSpacer;
  }

  /**
   * Calculate all-day height based on number of rows
   */
  private calculateAllDayHeight(targetRows: number): {
    targetHeight: number;
    currentHeight: number;
    heightDifference: number;
  } {
    const root = document.documentElement;
    const targetHeight = targetRows * ALL_DAY_CONSTANTS.SINGLE_ROW_HEIGHT;
    const currentHeight = parseInt(getComputedStyle(root).getPropertyValue('--all-day-row-height') || '0');
    const heightDifference = targetHeight - currentHeight;

    return { targetHeight, currentHeight, heightDifference };
  }

  /**
   * Clear cached DOM elements (call when DOM structure changes)
   */
  private clearCache(): void {
    this.cachedCalendarHeader = null;
    this.cachedAllDayContainer = null;
    this.cachedHeaderSpacer = null;
  }

  /**
   * Expand all-day row to show events
   */
  public expandAllDayRow(): void {
    const { currentHeight } = this.calculateAllDayHeight(0);

    if (currentHeight === 0) {
      this.checkAndAnimateAllDayHeight();
    }
  }

  /**
   * Collapse all-day row when no events
   */
  public collapseAllDayRow(): void {
    this.animateToRows(0);
  }

  /**
   * Check current all-day events and animate to correct height
   */
  public checkAndAnimateAllDayHeight(): void {
    const container = this.getAllDayContainer();
    if (!container) return;

    const allDayEvents = container.querySelectorAll('swp-allday-event');

    // Calculate required rows - 0 if no events (will collapse)
    let maxRows = 0;

    if (allDayEvents.length > 0) {
      // Expand events to all dates they span and group by date
      const expandedEventsByDate: Record<string, string[]> = {};

      (Array.from(allDayEvents) as HTMLElement[]).forEach((event: HTMLElement) => {
        const startISO = event.dataset.start || '';
        const endISO = event.dataset.end || startISO;
        const eventId = event.dataset.eventId || '';

        // Extract dates from ISO strings
        const startDate = startISO.split('T')[0]; // YYYY-MM-DD
        const endDate = endISO.split('T')[0]; // YYYY-MM-DD

        // Loop through all dates from start to end
        let current = new Date(startDate);
        const end = new Date(endDate);

        while (current <= end) {
          const dateStr = current.toISOString().split('T')[0]; // YYYY-MM-DD format

          if (!expandedEventsByDate[dateStr]) {
            expandedEventsByDate[dateStr] = [];
          }
          expandedEventsByDate[dateStr].push(eventId);

          // Move to next day
          current.setDate(current.getDate() + 1);
        }
      });

      // Find max rows needed
      maxRows = Math.max(
        ...Object.values(expandedEventsByDate).map(ids => ids?.length || 0),
        0
      );
    }

    // Animate to required rows (0 = collapse, >0 = expand)
    this.animateToRows(maxRows);
  }

  /**
   * Animate all-day container to specific number of rows
   */
  public animateToRows(targetRows: number): void {
    const { targetHeight, currentHeight, heightDifference } = this.calculateAllDayHeight(targetRows);

    if (targetHeight === currentHeight) return; // No animation needed

    console.log(`🎬 All-day height animation: ${currentHeight}px → ${targetHeight}px (${Math.ceil(currentHeight / ALL_DAY_CONSTANTS.SINGLE_ROW_HEIGHT)} → ${targetRows} rows)`);

    // Get cached elements
    const calendarHeader = this.getCalendarHeader();
    const headerSpacer = this.getHeaderSpacer();
    const allDayContainer = this.getAllDayContainer();

    if (!calendarHeader || !allDayContainer) return;

    // Get current parent height for animation
    const currentParentHeight = parseFloat(getComputedStyle(calendarHeader).height);
    const targetParentHeight = currentParentHeight + heightDifference;

    const animations = [
      calendarHeader.animate([
        { height: `${currentParentHeight}px` },
        { height: `${targetParentHeight}px` }
      ], {
        duration: 300,
        easing: 'ease-out',
        fill: 'forwards'
      })
    ];

    // Add spacer animation if spacer exists
    if (headerSpacer) {
      const root = document.documentElement;
      const currentSpacerHeight = parseInt(getComputedStyle(root).getPropertyValue('--header-height')) + currentHeight;
      const targetSpacerHeight = parseInt(getComputedStyle(root).getPropertyValue('--header-height')) + targetHeight;

      animations.push(
        headerSpacer.animate([
          { height: `${currentSpacerHeight}px` },
          { height: `${targetSpacerHeight}px` }
        ], {
          duration: 300,
          easing: 'ease-out',
          fill: 'forwards'
        })
      );
    }

    // Update CSS variable after animation
    Promise.all(animations.map(anim => anim.finished)).then(() => {
      const root = document.documentElement;
      root.style.setProperty('--all-day-row-height', `${targetHeight}px`);
      eventBus.emit('header:height-changed');
    });
  }

  /**
   * Handle conversion of timed event to all-day event
   */
  private handleConvertToAllDay(targetDate: string, originalElement: HTMLElement): void {
    // Extract event data from original element
    const eventId = originalElement.dataset.eventId;
    const title = originalElement.dataset.title || originalElement.textContent || 'Untitled';
    const type = originalElement.dataset.type || 'work';
    const startStr = originalElement.dataset.start;
    const endStr = originalElement.dataset.end;

    if (!eventId || !startStr || !endStr) {
      console.error('Original element missing required data (eventId, start, end)');
      return;
    }

    // Create CalendarEvent for all-day conversion - preserve original times
    const originalStart = new Date(startStr);
    const originalEnd = new Date(endStr);

    // Set date to target date but keep original time
    const targetStart = new Date(targetDate);
    targetStart.setHours(originalStart.getHours(), originalStart.getMinutes(), originalStart.getSeconds(), originalStart.getMilliseconds());

    const targetEnd = new Date(targetDate);
    targetEnd.setHours(originalEnd.getHours(), originalEnd.getMinutes(), originalEnd.getSeconds(), originalEnd.getMilliseconds());

    const calendarEvent: CalendarEvent = {
      id: `clone-${eventId}`,
      title: title,
      start: targetStart,
      end: targetEnd,
      type: type,
      allDay: true,
      syncStatus: 'synced',
      metadata: {
        duration: originalElement.dataset.duration || '60'
      }
    };

    // Check if all-day clone already exists for this event ID
    const existingAllDayEvent = document.querySelector(`swp-allday-container swp-allday-event[data-event-id="clone-${eventId}"]`);
    if (existingAllDayEvent) {
      // All-day event already exists, just ensure clone is hidden
      const dragClone = document.querySelector(`swp-event[data-event-id="clone-${eventId}"]`);
      if (dragClone) {
        (dragClone as HTMLElement).style.display = 'none';
      }
      return;
    }

    // Use renderer to create and add all-day event
    const allDayElement = this.allDayEventRenderer.renderAllDayEvent(calendarEvent, targetDate);

    if (allDayElement) {
      // Hide drag clone completely
      const dragClone = document.querySelector(`swp-event[data-event-id="clone-${eventId}"]`);
      if (dragClone) {
        (dragClone as HTMLElement).style.display = 'none';
      }

      // Animate height change
      this.checkAndAnimateAllDayHeight();
    }
  }


  /**
   * Update row height when all-day events change
   */
  public updateRowHeight(): void {
    this.checkAndAnimateAllDayHeight();
  }

  /**
   * Ensure all-day container exists, create if needed
   */
  public ensureAllDayContainer(): HTMLElement | null {
    console.log('🔍 AllDayManager: Checking if all-day container exists...');

    // Try to get existing container first
    let container = this.getAllDayContainer();

    if (!container) {

      this.allDayEventRenderer.clearCache(); // Clear cache to force re-check

      const header = this.getCalendarHeader();
      container = document.createElement('swp-allday-container');
      header?.appendChild(container);

      this.cachedAllDayContainer = container;

    }

    return container;
  }

  /**
   * Handle drag start for all-day events
   */
  private handleDragStart(originalElement: HTMLElement, eventId: string, mouseOffset: any): void {
    // Create clone
    const clone = originalElement.cloneNode(true) as HTMLElement;
    clone.dataset.eventId = `clone-${eventId}`;

    // Get container
    const container = this.getAllDayContainer();
    if (!container) return;

    // Add clone to container
    container.appendChild(clone);

    // Copy positioning from original
    clone.style.gridColumn = originalElement.style.gridColumn;
    clone.style.gridRow = originalElement.style.gridRow;

    // Add dragging style
    clone.classList.add('dragging');
    clone.style.zIndex = '1000';
    clone.style.cursor = 'grabbing';

    // Make original semi-transparent
    originalElement.style.opacity = '0.3';

    console.log('✅ AllDayManager: Created drag clone for all-day event', {
      eventId,
      cloneId: clone.dataset.eventId,
      gridColumn: clone.style.gridColumn,
      gridRow: clone.style.gridRow
    });
  }

  /**
   * Handle drag move for all-day events
   */
  private handleDragMove(dragClone: HTMLElement, mousePosition: any): void {
    // Calculate grid column based on mouse position
    const dayHeaders = document.querySelectorAll('swp-day-header');
    let targetColumn = 1;

    dayHeaders.forEach((header, index) => {
      const rect = header.getBoundingClientRect();
      if (mousePosition.x >= rect.left && mousePosition.x <= rect.right) {
        targetColumn = index + 1;
      }
    });

    // Update clone position
    dragClone.style.gridColumn = targetColumn.toString();

    console.log('🔄 AllDayManager: Updated drag clone position', {
      eventId: dragClone.dataset.eventId,
      targetColumn,
      mouseX: mousePosition.x
    });
  }

  /**
   * Handle drag end for all-day events
   */
  private handleDragEnd(originalElement: HTMLElement, dragClone: HTMLElement, finalPosition: any): void {
    // Remove original element
    originalElement?.remove();

    // Normalize clone
    const cloneId = dragClone.dataset.eventId;
    if (cloneId?.startsWith('clone-')) {
      dragClone.dataset.eventId = cloneId.replace('clone-', '');
    }

    // Remove dragging styles
    dragClone.classList.remove('dragging');
    dragClone.style.zIndex = '';
    dragClone.style.cursor = '';
    dragClone.style.opacity = '';

    // Recalculate all-day container height
    this.checkAndAnimateAllDayHeight();

    console.log('✅ AllDayManager: Completed drag operation for all-day event', {
      eventId: dragClone.dataset.eventId,
      finalColumn: dragClone.style.gridColumn
    });
  }


  /**
   * Clean up cached elements and resources
   */
  public destroy(): void {
    this.clearCache();
  }
}