/**
 * DragDropManager - Advanced drag-and-drop system with smooth animations and event type conversion
 *
 * ARCHITECTURE OVERVIEW:
 * =====================
 * DragDropManager provides a sophisticated drag-and-drop system for calendar events that supports:
 * - Smooth animated dragging with requestAnimationFrame
 * - Automatic event type conversion (timed events ↔ all-day events)
 * - Scroll compensation during edge scrolling
 * - Grid snapping for precise event placement
 * - Column detection and change tracking
 *
 * KEY FEATURES:
 * =============
 * 1. DRAG DETECTION
 *    - Movement threshold (5px) to distinguish clicks from drags
 *    - Immediate visual feedback with cloned element
 *    - Mouse offset tracking for natural drag feel
 *
 * 2. SMOOTH ANIMATION
 *    - Uses requestAnimationFrame for 60fps animations
 *    - Interpolated movement (30% per frame) for smooth transitions
 *    - Continuous drag:move events for real-time updates
 *
 * 3. EVENT TYPE CONVERSION
 *    - Timed → All-day: When dragging into calendar header
 *    - All-day → Timed: When dragging into day columns
 *    - Automatic clone replacement with appropriate element type
 *
 * 4. SCROLL COMPENSATION
 *    - Tracks scroll delta during edge-scrolling
 *    - Compensates dragged element position during scroll
 *    - Prevents visual "jumping" when scrolling while dragging
 *
 * 5. GRID SNAPPING
 *    - Snaps to time grid on mouse up
 *    - Uses PositionUtils for consistent positioning
 *    - Accounts for mouse offset within event
 *
 * STATE MANAGEMENT:
 * =================
 * Mouse Tracking:
 *   - mouseDownPosition: Initial click position
 *   - currentMousePosition: Latest mouse position
 *   - mouseOffset: Click offset within event (for natural dragging)
 *
 * Drag State:
 *   - originalElement: Source event being dragged
 *   - draggedClone: Animated clone following mouse
 *   - currentColumn: Column mouse is currently over
 *   - previousColumn: Last column (for detecting changes)
 *   - isDragStarted: Whether drag threshold exceeded
 *
 * Scroll State:
 *   - scrollDeltaY: Accumulated scroll offset during drag
 *   - lastScrollTop: Previous scroll position
 *   - isScrollCompensating: Whether edge-scroll is active
 *
 * Animation State:
 *   - dragAnimationId: requestAnimationFrame ID
 *   - targetY: Desired position for smooth interpolation
 *   - currentY: Current interpolated position
 *
 * EVENT FLOW:
 * ===========
 * 1. Mouse Down (handleMouseDown)
 *    ├─ Store originalElement and mouse offset
 *    └─ Wait for movement
 *
 * 2. Mouse Move (handleMouseMove)
 *    ├─ Check movement threshold
 *    ├─ Initialize drag if threshold exceeded (initializeDrag)
 *    │  ├─ Create clone
 *    │  ├─ Emit drag:start
 *    │  └─ Start animation loop
 *    ├─ Continue drag (continueDrag)
 *    │  ├─ Calculate target position with scroll compensation
 *    │  └─ Update animation target
 *    └─ Detect column changes (detectColumnChange)
 *       └─ Emit drag:column-change
 *
 * 3. Animation Loop (animateDrag)
 *    ├─ Interpolate currentY toward targetY
 *    ├─ Emit drag:move on each frame
 *    └─ Schedule next frame until target reached
 *
 * 4. Event Type Conversion
 *    ├─ Entering header (handleHeaderMouseEnter)
 *    │  ├─ Emit drag:mouseenter-header
 *    │  └─ AllDayManager creates all-day clone
 *    └─ Entering column (handleColumnMouseEnter)
 *       ├─ Emit drag:mouseenter-column
 *       └─ EventRenderingService creates timed clone
 *
 * 5. Mouse Up (handleMouseUp)
 *    ├─ Stop animation
 *    ├─ Snap to grid
 *    ├─ Detect drop target (header or column)
 *    ├─ Emit drag:end with final position
 *    └─ Cleanup drag state
 *
 * SCROLL COMPENSATION SYSTEM:
 * ===========================
 * Problem: When EdgeScrollManager scrolls the grid during drag, the dragged element
 *          can appear to "jump" because the mouse position stays the same but the
 *          coordinate system (scrollable content) has moved.
 *
 * Solution: Track cumulative scroll delta and add it to mouse position calculations
 *
 * Flow:
 * 1. EdgeScrollManager starts scrolling → emit edgescroll:started
 * 2. DragDropManager sets isScrollCompensating = true
 * 3. On each scroll event:
 *    ├─ Calculate scrollDelta = currentScrollTop - lastScrollTop
 *    ├─ Accumulate into scrollDeltaY
 *    └─ Call continueDrag with adjusted position
 * 4. continueDrag adds scrollDeltaY to mouse Y coordinate
 * 5. On event conversion, reset scrollDeltaY (new clone, new coordinate system)
 *
 * PERFORMANCE OPTIMIZATIONS:
 * ==========================
 * - Uses ColumnDetectionUtils cache for fast column lookups
 * - Single requestAnimationFrame loop (not per-mousemove)
 * - Interpolated animation reduces update frequency
 * - Passive scroll listeners
 * - Event delegation for header/column detection
 *
 * USAGE:
 * ======
 * const dragDropManager = new DragDropManager(eventBus, positionUtils);
 * // Automatically attaches event listeners and manages drag lifecycle
 * // Other managers listen to drag:start, drag:move, drag:end, etc.
 */

import { IEventBus } from '../types/CalendarTypes';
import { PositionUtils } from '../utils/PositionUtils';
import { IColumnBounds, ColumnDetectionUtils } from '../utils/ColumnDetectionUtils';
import { SwpEventElement, BaseSwpEventElement } from '../elements/SwpEventElement';
import {
  IDragStartEventPayload,
  IDragMoveEventPayload,
  IDragEndEventPayload,
  IDragMouseEnterHeaderEventPayload,
  IDragMouseLeaveHeaderEventPayload,
  IDragMouseEnterColumnEventPayload,
  IDragColumnChangeEventPayload
} from '../types/EventTypes';
import { IMousePosition } from '../types/DragDropTypes';
import { CoreEvents } from '../constants/CoreEvents'; 

export class DragDropManager {
  private eventBus: IEventBus;

  // Mouse tracking with optimized state
  private mouseDownPosition: IMousePosition = { x: 0, y: 0 };
  private currentMousePosition: IMousePosition = { x: 0, y: 0 };
  private mouseOffset: IMousePosition = { x: 0, y: 0 };

  // Drag state
  private originalElement!: HTMLElement | null;
  private draggedClone!: HTMLElement | null;
  private currentColumn: IColumnBounds | null = null;
  private previousColumn: IColumnBounds | null = null;
  private originalSourceColumn: IColumnBounds | null = null;  // Track original start column
  private isDragStarted = false;

  // Movement threshold to distinguish click from drag
  private readonly dragThreshold = 5; // pixels

  // Scroll compensation
  private scrollableContent: HTMLElement | null = null;
  private scrollDeltaY = 0; // Current scroll delta to apply in continueDrag
  private lastScrollTop = 0; // Last scroll position for delta calculation
  private isScrollCompensating = false; // Track if scroll compensation is active

  // Smooth drag animation
  private dragAnimationId: number | null = null;
  private targetY = 0;
  private currentY = 0;
  private targetColumn: IColumnBounds | null = null;
  private positionUtils: PositionUtils;

  constructor(eventBus: IEventBus, positionUtils: PositionUtils) {
    this.eventBus = eventBus;
    this.positionUtils = positionUtils;

    this.init();
  }

  /**
   * Initialize with optimized event listener setup
   */
  private init(): void {
    // Add event listeners
    document.body.addEventListener('mousemove', this.handleMouseMove.bind(this));
    document.body.addEventListener('mousedown', this.handleMouseDown.bind(this));
    document.body.addEventListener('mouseup', this.handleMouseUp.bind(this));

    const calendarContainer = document.querySelector('swp-calendar-container');

    if (calendarContainer) {
      calendarContainer.addEventListener('mouseleave', () => {
        if (this.originalElement && this.isDragStarted) {
          this.cancelDrag();
        }
      });

      // Event delegation for header enter/leave
      calendarContainer.addEventListener('mouseenter', (e) => {
        const target = e.target as HTMLElement;
        if (target.closest('swp-calendar-header')) {
          this.handleHeaderMouseEnter(e as MouseEvent);
        } else if (target.closest('swp-day-column')) {
          this.handleColumnMouseEnter(e as MouseEvent);
        }
      }, true); // Use capture phase

      calendarContainer.addEventListener('mouseleave', (e) => {
        const target = e.target as HTMLElement;
        if (target.closest('swp-calendar-header')) {
          this.handleHeaderMouseLeave(e as MouseEvent);
        }
        // Don't handle swp-event mouseleave here - let mousemove handle it
      }, true); // Use capture phase
    }

    // Initialize column bounds cache
    ColumnDetectionUtils.updateColumnBoundsCache();




    // Listen to resize events to update cache
    window.addEventListener('resize', () => {
      ColumnDetectionUtils.updateColumnBoundsCache();
    });

    // Listen to navigation events to update cache
    this.eventBus.on('navigation:completed', () => {
      ColumnDetectionUtils.updateColumnBoundsCache();
    });

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

    // Listen to edge-scroll events to control scroll compensation
    this.eventBus.on('edgescroll:started', () => {
      this.isScrollCompensating = true;

      // Gem nuværende scroll position for delta beregning
      if (this.scrollableContent) {
        this.lastScrollTop = this.scrollableContent.scrollTop;
      }
    });

    this.eventBus.on('edgescroll:stopped', () => {
      this.isScrollCompensating = false;
    });

    // Reset scrollDeltaY when event converts (new clone created)
    this.eventBus.on('drag:mouseenter-header', () => {
      this.scrollDeltaY = 0;
      this.lastScrollTop = 0;
    });

    this.eventBus.on('drag:mouseenter-column', () => {
      this.scrollDeltaY = 0;
      this.lastScrollTop = 0;
    });

  }
  private handleGridRendered(event: CustomEvent) {
    this.scrollableContent = document.querySelector('swp-scrollable-content');
    this.scrollableContent!.addEventListener('scroll', this.handleScroll.bind(this), { passive: true });
  }

  private handleMouseDown(event: MouseEvent): void {

    // Clean up drag state first
    this.cleanupDragState();
    ColumnDetectionUtils.updateColumnBoundsCache();
    //this.lastMousePosition = { x: event.clientX, y: event.clientY };
    //this.initialMousePosition = { x: event.clientX, y: event.clientY };

    // Check if mousedown is on an event
    const target = event.target as HTMLElement;
    if (target.closest('swp-resize-handle')) return;

    let eventElement = target;

    while (eventElement && eventElement.tagName !== 'SWP-GRID-CONTAINER') {
      if (eventElement.tagName === 'SWP-EVENT' || eventElement.tagName === 'SWP-ALLDAY-EVENT') {
        break;
      }
      eventElement = eventElement.parentElement as HTMLElement;
      if (!eventElement) return;
    }

    if (eventElement) {

      // Normal drag - prepare for potential dragging
      this.originalElement = eventElement;
      // Calculate mouse offset within event
      const eventRect = eventElement.getBoundingClientRect();
      this.mouseOffset = {
        x: event.clientX - eventRect.left,
        y: event.clientY - eventRect.top
      };
      this.mouseDownPosition = { x: event.clientX, y: event.clientY };

    }
  }

  private handleMouseMove(event: MouseEvent): void {

    if (event.buttons === 1) {
      // Always update mouse position from event
      this.currentMousePosition = { x: event.clientX, y: event.clientY };

      // Try to initialize drag if not started
      if (!this.isDragStarted && this.originalElement) {
        if (!this.initializeDrag(this.currentMousePosition)) {
          return; // Not enough movement yet
        }
      }

      // Continue drag if started (også under scroll - accumulatedScrollDelta kompenserer)
      if (this.isDragStarted && this.originalElement && this.draggedClone) {
        this.continueDrag(this.currentMousePosition);
        this.detectColumnChange(this.currentMousePosition);
      }
    }
  }

  /**
   * Try to initialize drag based on movement threshold
   * Returns true if drag was initialized, false if not enough movement
   */
  private initializeDrag(currentPosition: IMousePosition): boolean {
    const deltaX = Math.abs(currentPosition.x - this.mouseDownPosition.x);
    const deltaY = Math.abs(currentPosition.y - this.mouseDownPosition.y);
    const totalMovement = Math.sqrt(deltaX * deltaX + deltaY * deltaY);

    if (totalMovement < this.dragThreshold) {
      return false; // Not enough movement
    }

    // Start drag
    this.isDragStarted = true;



    // Set high z-index on event-group if exists, otherwise on event itself
    const eventGroup = this.originalElement!.closest<HTMLElement>('swp-event-group');
    if (eventGroup) {
      eventGroup.style.zIndex = '9999';
    } else {
      this.originalElement!.style.zIndex = '9999';
    }

    const originalElement = this.originalElement as BaseSwpEventElement;
    this.currentColumn = ColumnDetectionUtils.getColumnBounds(currentPosition);
    this.originalSourceColumn = this.currentColumn;  // Store original source column at drag start
    this.draggedClone = originalElement.createClone();

    const dragStartPayload: IDragStartEventPayload = {
      originalElement: this.originalElement!,
      draggedClone: this.draggedClone,
      mousePosition: this.mouseDownPosition,
      mouseOffset: this.mouseOffset,
      columnBounds: this.currentColumn
    };
    this.eventBus.emit('drag:start', dragStartPayload);

    return true;
  }


  private continueDrag(currentPosition: IMousePosition): void {

    if (!this.draggedClone!.hasAttribute("data-allday")) {
      // Calculate raw position from mouse (no snapping)
      const column = ColumnDetectionUtils.getColumnBounds(currentPosition);

      if (column) {
        // Calculate raw Y position relative to column (accounting for mouse offset)
        const columnRect = column.boundingClientRect;

        // Beregn position fra mus + scroll delta kompensation
        const adjustedMouseY = currentPosition.y + this.scrollDeltaY;
        const eventTopY = adjustedMouseY - columnRect.top - this.mouseOffset.y;

        this.targetY = Math.max(0, eventTopY);
        this.targetColumn = column;

        // Start animation loop if not already running
        if (this.dragAnimationId === null) {
          this.currentY = parseFloat(this.draggedClone!.style.top) || 0;
          this.animateDrag();
        }
      }

    }
  }

  /**
   * Detect column change and emit event
   */
  private detectColumnChange(currentPosition: IMousePosition): void {
    const newColumn = ColumnDetectionUtils.getColumnBounds(currentPosition);
    if (newColumn == null) return;

    if (newColumn.index !== this.currentColumn?.index) {
      this.previousColumn = this.currentColumn;
      this.currentColumn = newColumn;

      const dragColumnChangePayload: IDragColumnChangeEventPayload = {
        originalElement: this.originalElement!,
        draggedClone: this.draggedClone!,
        previousColumn: this.previousColumn,
        newColumn,
        mousePosition: currentPosition
      };
      this.eventBus.emit('drag:column-change', dragColumnChangePayload);
    }
  }

  /**
   * Optimized mouse up handler with consolidated cleanup
   */
  private handleMouseUp(event: MouseEvent): void {
    this.stopDragAnimation();

    if (this.originalElement) {

      // Only emit drag:end if drag was actually started
      if (this.isDragStarted) {
        const mousePosition: IMousePosition = { x: event.clientX, y: event.clientY };

        // Snap to grid on mouse up (like ResizeHandleManager)
        const column = ColumnDetectionUtils.getColumnBounds(mousePosition);

        if (!column) return;

        // Get current position and snap it to grid
        const snappedY = this.calculateSnapPosition(mousePosition.y, column);

        // Update clone to snapped position immediately
        if (this.draggedClone) {
          this.draggedClone.style.top = `${snappedY}px`;
        }

        // Detect drop target (swp-day-column or swp-day-header)
        const dropTarget = this.detectDropTarget(mousePosition);

        if (!dropTarget)
          throw "dropTarget is null";

        const dragEndPayload: IDragEndEventPayload = {
          originalElement: this.originalElement,
          draggedClone: this.draggedClone,
          mousePosition,
          originalSourceColumn: this.originalSourceColumn!!,
          finalPosition: { column, snappedY },  // Where drag ended
          target: dropTarget
        };

        this.eventBus.emit('drag:end', dragEndPayload);

        this.cleanupDragState();

      } else {
        // This was just a click - emit click event instead
        this.eventBus.emit('event:click', {
          clickedElement: this.originalElement,
          mousePosition: { x: event.clientX, y: event.clientY }
        });
      }
    }
  }
  // Add a cleanup method that finds and removes ALL clones
  private cleanupAllClones(): void {
    // Remove clones from all possible locations
    const allClones = document.querySelectorAll('[data-event-id^="clone"]');

    if (allClones.length > 0) {
      allClones.forEach(clone => clone.remove());
    }
  }

  /**
   * Cancel drag operation when mouse leaves grid container
   * Animates clone back to original position before cleanup
   */
  private cancelDrag(): void {
    if (!this.originalElement || !this.draggedClone) return;

    // Get current clone position
    const cloneRect = this.draggedClone.getBoundingClientRect();

    // Get original element position
    const originalRect = this.originalElement.getBoundingClientRect();

    // Calculate distance to animate
    const deltaX = originalRect.left - cloneRect.left;
    const deltaY = originalRect.top - cloneRect.top;

    // Add transition for smooth animation
    this.draggedClone.style.transition = 'transform 300ms ease-out';
    this.draggedClone.style.transform = `translate(${deltaX}px, ${deltaY}px)`;

    // Wait for animation to complete, then cleanup
    setTimeout(() => {
      this.cleanupAllClones();

      if (this.originalElement) {
        this.originalElement.style.opacity = '';
        this.originalElement.style.cursor = '';
      }

      this.eventBus.emit('drag:cancelled', {
        originalElement: this.originalElement,
        reason: 'mouse-left-grid'
      });

      this.cleanupDragState();
      this.stopDragAnimation();
    }, 300);
  }

  /**
   * Optimized snap position calculation using PositionUtils
   */
  private calculateSnapPosition(mouseY: number, column: IColumnBounds): number {
    // Calculate where the event top would be (accounting for mouse offset)
    const eventTopY = mouseY - this.mouseOffset.y;

    // Snap the event top position, not the mouse position
    const snappedY = this.positionUtils.getPositionFromCoordinate(eventTopY, column);

    return Math.max(0, snappedY);
  }

  /**
   * Smooth drag animation using requestAnimationFrame
   * Emits drag:move events with current draggedClone reference on each frame
   */
  private animateDrag(): void { //TODO: this can be optimized... WAIT !!!

    if (!this.isDragStarted || !this.draggedClone || !this.targetColumn) {
      this.dragAnimationId = null;
      return;
    }

    // Smooth interpolation towards target
    const diff = this.targetY - this.currentY;
    const step = diff * 0.3; // 30% of distance per frame

    // Update if difference is significant
    if (Math.abs(diff) > 0.5) {
      this.currentY += step;

      // Emit drag:move event with current draggedClone reference
      const dragMovePayload: IDragMoveEventPayload = {
        originalElement: this.originalElement!,
        draggedClone: this.draggedClone, // Always uses current reference
        mousePosition: this.currentMousePosition, // Use current mouse position!
        snappedY: this.currentY,
        columnBounds: this.targetColumn,
        mouseOffset: this.mouseOffset
      };
      this.eventBus.emit('drag:move', dragMovePayload);

      this.dragAnimationId = requestAnimationFrame(() => this.animateDrag());
    } else {
      // Close enough - snap to target
      this.currentY = this.targetY;

      // Emit final position
      const dragMovePayload: IDragMoveEventPayload = {
        originalElement: this.originalElement!,
        draggedClone: this.draggedClone,
        mousePosition: this.currentMousePosition, // Use current mouse position!
        snappedY: this.currentY,
        columnBounds: this.targetColumn,
        mouseOffset: this.mouseOffset
      };
      this.eventBus.emit('drag:move', dragMovePayload);

      this.dragAnimationId = null;
    }
  }

  /**
   * Handle scroll during drag - update scrollDeltaY and call continueDrag
   */
  private handleScroll(): void {
    if (!this.isDragStarted || !this.draggedClone || !this.scrollableContent || !this.isScrollCompensating) return;

    const currentScrollTop = this.scrollableContent.scrollTop;
    const scrollDelta = currentScrollTop - this.lastScrollTop;

    // Gem scroll delta for continueDrag
    this.scrollDeltaY += scrollDelta;
    this.lastScrollTop = currentScrollTop;

    // Kald continueDrag med nuværende mus position
    this.continueDrag(this.currentMousePosition);
  }

  /**
   * Stop drag animation
   */
  private stopDragAnimation(): void {
    if (this.dragAnimationId !== null) {
      cancelAnimationFrame(this.dragAnimationId);
      this.dragAnimationId = null;
    }
  }

  /**
   * Clean up drag state
   */
  private cleanupDragState(): void {
    this.previousColumn = null;
    this.originalElement = null;
    this.draggedClone = null;
    this.currentColumn = null;
    this.originalSourceColumn = null;
    this.isDragStarted = false;
    this.scrollDeltaY = 0;
    this.lastScrollTop = 0;
  }

  /**
   * Detect drop target - whether dropped in swp-day-column or swp-day-header
   */
  private detectDropTarget(position: IMousePosition): 'swp-day-column' | 'swp-day-header' | null {

    // Traverse up the DOM tree to find the target container
    let currentElement = this.draggedClone;
    while (currentElement && currentElement !== document.body) {
      if (currentElement.tagName === 'SWP-ALLDAY-CONTAINER') {
        return 'swp-day-header';
      }
      if (currentElement.tagName === 'SWP-DAY-COLUMN') {
        return 'swp-day-column';
      }
      currentElement = currentElement.parentElement as HTMLElement;
    }

    return null;
  }

  /**
   * Handle mouse enter on calendar header - simplified using native events
   */
  private handleHeaderMouseEnter(event: MouseEvent): void {
    // Only handle if we're dragging a timed event (not all-day)
    if (!this.isDragStarted || !this.draggedClone) {
      return;
    }

    const position: IMousePosition = { x: event.clientX, y: event.clientY };
    const targetColumn = ColumnDetectionUtils.getColumnBounds(position);

    if (targetColumn) {
      const calendarEvent = SwpEventElement.extractCalendarEventFromElement(this.draggedClone);

      const dragMouseEnterPayload: IDragMouseEnterHeaderEventPayload = {
        targetColumn: targetColumn,
        mousePosition: position,
        originalElement: this.originalElement,
        draggedClone: this.draggedClone,
        calendarEvent: calendarEvent,
        replaceClone: (newClone: HTMLElement) => {
          this.draggedClone = newClone;
          this.dragAnimationId === null;
        }
      };
      this.eventBus.emit('drag:mouseenter-header', dragMouseEnterPayload);
    }
  }

  /**
   * Handle mouse enter on day column - for converting all-day to timed events
   */
  private handleColumnMouseEnter(event: MouseEvent): void {
    // Only handle if we're dragging an all-day event
    if (!this.isDragStarted || !this.draggedClone || !this.draggedClone.hasAttribute('data-allday')) {
      return;
    }

    const position: IMousePosition = { x: event.clientX, y: event.clientY };
    const targetColumn = ColumnDetectionUtils.getColumnBounds(position);

    if (!targetColumn) {
      return;
    }

    // Calculate snapped Y position
    const snappedY = this.calculateSnapPosition(position.y, targetColumn);

    // Extract ICalendarEvent from the dragged clone
    const calendarEvent = SwpEventElement.extractCalendarEventFromElement(this.draggedClone);

    const dragMouseEnterPayload: IDragMouseEnterColumnEventPayload = {
      targetColumn: targetColumn,
      mousePosition: position,
      snappedY: snappedY,
      originalElement: this.originalElement,
      draggedClone: this.draggedClone,
      calendarEvent: calendarEvent,
      replaceClone: (newClone: HTMLElement) => {
        this.draggedClone = newClone;
        this.dragAnimationId === null;
        this.stopDragAnimation();
      }
    };
    this.eventBus.emit('drag:mouseenter-column', dragMouseEnterPayload);
  }

  /**
   * Handle mouse leave from calendar header - simplified using native events
   */
  private handleHeaderMouseLeave(event: MouseEvent): void {
    // Only handle if we're dragging an all-day event
    if (!this.isDragStarted || !this.draggedClone || !this.draggedClone.hasAttribute("data-allday")) {
      return;
    }

    const position: IMousePosition = { x: event.clientX, y: event.clientY };
    const targetColumn = ColumnDetectionUtils.getColumnBounds(position);

    if (!targetColumn) {
      return;
    }

    const dragMouseLeavePayload: IDragMouseLeaveHeaderEventPayload = {
      targetDate: targetColumn.date,
      mousePosition: position,
      originalElement: this.originalElement,
      draggedClone: this.draggedClone
    };
    this.eventBus.emit('drag:mouseleave-header', dragMouseLeavePayload);
  }
}