path: root/apps/web/src/components/editor/timeline.tsx

"use client";

import { ScrollArea } from "../ui/scroll-area";
import { Button } from "../ui/button";
import {
  Scissors,
  ArrowLeftToLine,
  ArrowRightToLine,
  Trash2,
  Snowflake,
  Copy,
  SplitSquareHorizontal,
} from "lucide-react";
import {
  Tooltip,
  TooltipContent,
  TooltipTrigger,
  TooltipProvider,
} from "../ui/tooltip";
import { DragOverlay } from "../ui/drag-overlay";
import { useTimelineStore, type TimelineTrack } from "@/stores/timeline-store";
import { useMediaStore } from "@/stores/media-store";
import { usePlaybackStore } from "@/stores/playback-store";
import { processMediaFiles } from "@/lib/media-processing";
import { ImageTimelineTreatment } from "@/components/ui/image-timeline-treatment";
import { toast } from "sonner";
import { useState, useRef, useEffect } from "react";

export function Timeline() {
  const { tracks, addTrack, addClipToTrack } = useTimelineStore();
  const { mediaItems, addMediaItem } = useMediaStore();
  const { currentTime, duration, seek } = usePlaybackStore();
  const [isDragOver, setIsDragOver] = useState(false);
  const [isProcessing, setIsProcessing] = useState(false);
  const [zoomLevel, setZoomLevel] = useState(1);
  const dragCounterRef = useRef(0);
  const timelineRef = useRef<HTMLDivElement>(null);

  const handleDragEnter = (e: React.DragEvent) => {
    e.preventDefault();

    // Don't show overlay for timeline clips or other internal drags
    if (e.dataTransfer.types.includes("application/x-timeline-clip")) {
      return;
    }

    dragCounterRef.current += 1;
    if (!isDragOver) {
      setIsDragOver(true);
    }
  };

  const handleDragOver = (e: React.DragEvent) => {
    e.preventDefault();
  };

  const handleDragLeave = (e: React.DragEvent) => {
    e.preventDefault();

    // Don't update state for timeline clips
    if (e.dataTransfer.types.includes("application/x-timeline-clip")) {
      return;
    }

    dragCounterRef.current -= 1;
    if (dragCounterRef.current === 0) {
      setIsDragOver(false);
    }
  };

  const handleDrop = async (e: React.DragEvent) => {
    e.preventDefault();
    setIsDragOver(false);
    dragCounterRef.current = 0;

    const mediaItemData = e.dataTransfer.getData("application/x-media-item");
    if (mediaItemData) {
      // Handle media item drops by creating new tracks
      try {
        const { id, type } = JSON.parse(mediaItemData);
        const mediaItem = mediaItems.find((item) => item.id === id);

        if (!mediaItem) {
          toast.error("Media item not found");
          return;
        }

        const trackType = type === "audio" ? "audio" : "video";
        const newTrackId = addTrack(trackType);

        addClipToTrack(newTrackId, {
          mediaId: mediaItem.id,
          name: mediaItem.name,
          duration: mediaItem.duration || 5,
          startTime: 0,
          trimStart: 0,
          trimEnd: 0,
        });

        toast.success(`Added ${mediaItem.name} to new ${trackType} track`);
      } catch (error) {
        console.error("Error parsing media item data:", error);
        toast.error("Failed to add media to timeline");
      }
    } else if (e.dataTransfer.files?.length > 0) {
      // Handle file drops by creating new tracks
      setIsProcessing(true);

      try {
        const processedItems = await processMediaFiles(e.dataTransfer.files);

        for (const processedItem of processedItems) {
          addMediaItem(processedItem);

          const currentMediaItems = useMediaStore.getState().mediaItems;
          const addedItem = currentMediaItems.find(
            (item) => item.name === processedItem.name && item.url === processedItem.url
          );

          if (addedItem) {
            const trackType = processedItem.type === "audio" ? "audio" : "video";
            const newTrackId = addTrack(trackType);

            addClipToTrack(newTrackId, {
              mediaId: addedItem.id,
              name: addedItem.name,
              duration: addedItem.duration || 5,
              startTime: 0,
              trimStart: 0,
              trimEnd: 0,
            });
          }
        }
      } catch (error) {
        console.error("Error processing external files:", error);
        toast.error("Failed to process dropped files");
      } finally {
        setIsProcessing(false);
      }
    }
  };

  const handleTimelineClick = (e: React.MouseEvent) => {
    const timeline = timelineRef.current;
    if (!timeline || duration === 0) return;

    const rect = timeline.getBoundingClientRect();
    const x = e.clientX - rect.left;
    const timelineWidth = rect.width;
    const visibleDuration = duration / zoomLevel;
    const clickedTime = (x / timelineWidth) * visibleDuration;

    seek(Math.max(0, Math.min(duration, clickedTime)));
  };

  const handleWheel = (e: React.WheelEvent) => {
    e.preventDefault();
    const delta = e.deltaY > 0 ? -0.05 : 0.05;
    setZoomLevel(prev => Math.max(0.1, Math.min(10, prev + delta)));
  };

  const dragProps = {
    onDragEnter: handleDragEnter,
    onDragOver: handleDragOver,
    onDragLeave: handleDragLeave,
    onDrop: handleDrop,
  };

  return (
    <div
      className={`h-full flex flex-col transition-colors duration-200 relative ${isDragOver ? "bg-accent/30 border-accent" : ""
        }`}
      {...dragProps}
    >

      {/* Toolbar */}
      <div className="border-b flex items-center px-2 py-1 gap-1">
        <TooltipProvider delayDuration={500}>
          <Tooltip>
            <TooltipTrigger asChild>
              <Button variant="ghost" size="icon">
                <Scissors className="h-4 w-4" />
              </Button>
            </TooltipTrigger>
            <TooltipContent>Split clip (S)</TooltipContent>
          </Tooltip>

          <Tooltip>
            <TooltipTrigger asChild>
              <Button variant="ghost" size="icon">
                <ArrowLeftToLine className="h-4 w-4" />
              </Button>
            </TooltipTrigger>
            <TooltipContent>Split and keep left (A)</TooltipContent>
          </Tooltip>

          <Tooltip>
            <TooltipTrigger asChild>
              <Button variant="ghost" size="icon">
                <ArrowRightToLine className="h-4 w-4" />
              </Button>
            </TooltipTrigger>
            <TooltipContent>Split and keep right (D)</TooltipContent>
          </Tooltip>

          <Tooltip>
            <TooltipTrigger asChild>
              <Button variant="ghost" size="icon">
                <SplitSquareHorizontal className="h-4 w-4" />
              </Button>
            </TooltipTrigger>
            <TooltipContent>Separate audio (E)</TooltipContent>
          </Tooltip>

          <Tooltip>
            <TooltipTrigger asChild>
              <Button variant="ghost" size="icon">
                <Copy className="h-4 w-4" />
              </Button>
            </TooltipTrigger>
            <TooltipContent>Duplicate clip (Ctrl+D)</TooltipContent>
          </Tooltip>

          <Tooltip>
            <TooltipTrigger asChild>
              <Button variant="ghost" size="icon">
                <Snowflake className="h-4 w-4" />
              </Button>
            </TooltipTrigger>
            <TooltipContent>Freeze frame (F)</TooltipContent>
          </Tooltip>

          <Tooltip>
            <TooltipTrigger asChild>
              <Button variant="ghost" size="icon">
                <Trash2 className="h-4 w-4" />
              </Button>
            </TooltipTrigger>
            <TooltipContent>Delete clip (Delete)</TooltipContent>
          </Tooltip>
        </TooltipProvider>
      </div>

      {/* Timeline Container */}
      <div className="flex-1 flex flex-col overflow-hidden">
        {/* Timeline Header with Ruler */}
        <div className="flex border-b bg-background sticky top-0 z-10">
          {/* Track Labels Header */}
          <div className="w-48 flex-shrink-0 bg-muted/30 border-r flex items-center justify-between px-3 py-2">
            <span className="text-sm font-medium text-muted-foreground">Tracks</span>
            <div className="text-xs text-muted-foreground">
              {zoomLevel.toFixed(1)}x
            </div>
          </div>

          {/* Timeline Ruler */}
          <div className="flex-1 relative overflow-hidden">
            <ScrollArea className="w-full">
              <div
                className="relative h-12 bg-muted/30"
                style={{ width: `${Math.max(1000, duration * 50 * zoomLevel)}px` }}
              >
                {/* Time markers */}
                {(() => {
                  // Calculate appropriate time interval based on zoom level
                  const getTimeInterval = (zoom: number) => {
                    const pixelsPerSecond = 50 * zoom;
                    if (pixelsPerSecond >= 200) return 0.1; // Every 0.1s when very zoomed in
                    if (pixelsPerSecond >= 100) return 0.5; // Every 0.5s when zoomed in
                    if (pixelsPerSecond >= 50) return 1;    // Every 1s at normal zoom
                    if (pixelsPerSecond >= 25) return 2;    // Every 2s when zoomed out
                    if (pixelsPerSecond >= 12) return 5;    // Every 5s when more zoomed out
                    if (pixelsPerSecond >= 6) return 10;    // Every 10s when very zoomed out
                    return 30;                              // Every 30s when extremely zoomed out
                  };

                  const interval = getTimeInterval(zoomLevel);
                  const markerCount = Math.ceil(duration / interval) + 1;

                  return Array.from({ length: markerCount }, (_, i) => {
                    const time = i * interval;
                    if (time > duration) return null;

                    const isMainMarker = time % (interval >= 1 ? Math.max(1, interval) : 1) === 0;

                    return (
                      <div
                        key={i}
                        className={`absolute top-0 bottom-0 ${isMainMarker
                          ? 'border-l border-muted-foreground/40'
                          : 'border-l border-muted-foreground/20'
                          }`}
                        style={{ left: `${time * 50 * zoomLevel}px` }}
                      >
                        <span className={`absolute top-1 left-1 text-xs ${isMainMarker
                          ? 'text-muted-foreground font-medium'
                          : 'text-muted-foreground/70'
                          }`}>
                          {(() => {
                            const formatTime = (seconds: number) => {
                              const hours = Math.floor(seconds / 3600);
                              const minutes = Math.floor((seconds % 3600) / 60);
                              const secs = seconds % 60;

                              if (hours > 0) {
                                return `${hours}:${minutes.toString().padStart(2, '0')}:${Math.floor(secs).toString().padStart(2, '0')}`;
                              } else if (minutes > 0) {
                                return `${minutes}:${Math.floor(secs).toString().padStart(2, '0')}`;
                              } else if (interval >= 1) {
                                return `${Math.floor(secs)}s`;
                              } else {
                                return `${secs.toFixed(1)}s`;
                              }
                            };
                            return formatTime(time);
                          })()}
                        </span>
                      </div>
                    );
                  }).filter(Boolean);
                })()}

                {/* Playhead in ruler */}
                <div
                  className="absolute top-0 bottom-0 w-0.5 bg-red-500 pointer-events-none z-10"
                  style={{ left: `${currentTime * 50 * zoomLevel}px` }}
                >
                  <div className="absolute top-1 left-1/2 transform -translate-x-1/2 w-3 h-3 bg-red-500 rounded-full border-2 border-white shadow-sm" />
                </div>
              </div>
            </ScrollArea>
          </div>
        </div>

        {/* Tracks Area */}
        <div className="flex-1 flex overflow-hidden">
          {/* Track Labels */}
          <div className="w-48 flex-shrink-0 border-r bg-background overflow-y-auto">
            {tracks.length === 0 ? (
              <div className="flex flex-col items-center justify-center h-full py-8 text-center px-4">
                <div className="w-12 h-12 rounded-full bg-muted/30 flex items-center justify-center mb-3">
                  <SplitSquareHorizontal className="h-6 w-6 text-muted-foreground" />
                </div>
                <p className="text-sm text-muted-foreground">No tracks</p>
                <p className="text-xs text-muted-foreground/70 mt-1">
                  Drop media to create tracks
                </p>
              </div>
            ) : (
              <div className="flex flex-col">
                {tracks.map((track) => (
                  <div
                    key={track.id}
                    className="h-[60px] flex items-center px-3 border-b border-muted/30 bg-background"
                  >
                    <div className="flex items-center gap-2 flex-1 min-w-0">
                      <div className={`w-3 h-3 rounded-full flex-shrink-0 ${track.type === 'video' ? 'bg-blue-500' :
                        track.type === 'audio' ? 'bg-green-500' : 'bg-purple-500'
                        }`} />
                      <span className="text-sm font-medium truncate">{track.name}</span>
                    </div>
                  </div>
                ))}
              </div>
            )}
          </div>

          {/* Timeline Tracks Content */}
          <div className="flex-1 relative">
            <ScrollArea className="h-full w-full">
              <div
                ref={timelineRef}
                className="relative cursor-pointer select-none"
                style={{
                  width: `${Math.max(1000, duration * 50 * zoomLevel)}px`,
                  minHeight: tracks.length > 0 ? `${tracks.length * 60}px` : '200px'
                }}
                onClick={handleTimelineClick}
                onWheel={handleWheel}
              >
                {tracks.length === 0 ? (
                  <div className="absolute inset-0 flex items-center justify-center">
                    <div className="text-center">
                      <div className="w-16 h-16 rounded-full bg-muted/30 flex items-center justify-center mb-4 mx-auto">
                        <SplitSquareHorizontal className="h-8 w-8 text-muted-foreground" />
                      </div>
                      <p className="text-sm text-muted-foreground">Drop media here to start</p>
                    </div>
                  </div>
                ) : (
                  <>
                    {tracks.map((track, index) => (
                      <div
                        key={track.id}
                        className="absolute left-0 right-0 border-b border-muted/30"
                        style={{
                          top: `${index * 60}px`,
                          height: '60px'
                        }}
                      >
                        <TimelineTrackContent track={track} zoomLevel={zoomLevel} />
                      </div>
                    ))}

                    {/* Playhead for tracks area */}
                    <div
                      className="absolute top-0 w-0.5 bg-red-500 pointer-events-none z-20"
                      style={{
                        left: `${currentTime * 50 * zoomLevel}px`,
                        height: `${tracks.length * 60}px`
                      }}
                    />
                  </>
                )}
              </div>
            </ScrollArea>
          </div>
        </div>
      </div>
    </div>
  );
}

function TimelineTrackContent({ track, zoomLevel }: { track: TimelineTrack, zoomLevel: number }) {
  const { mediaItems } = useMediaStore();
  const { tracks, moveClipToTrack, updateClipTrim, updateClipStartTime, addClipToTrack } = useTimelineStore();
  const [isDropping, setIsDropping] = useState(false);
  const [dropPosition, setDropPosition] = useState<number | null>(null);
  const [isDraggedOver, setIsDraggedOver] = useState(false);
  const [wouldOverlap, setWouldOverlap] = useState(false);
  const [resizing, setResizing] = useState<{
    clipId: string;
    side: 'left' | 'right';
    startX: number;
    initialTrimStart: number;
    initialTrimEnd: number;
  } | null>(null);
  const dragCounterRef = useRef(0);

  const handleResizeStart = (e: React.MouseEvent, clipId: string, side: 'left' | 'right') => {
    e.stopPropagation();
    e.preventDefault();

    const clip = track.clips.find(c => c.id === clipId);
    if (!clip) return;

    setResizing({
      clipId,
      side,
      startX: e.clientX,
      initialTrimStart: clip.trimStart,
      initialTrimEnd: clip.trimEnd
    });
  };

  const updateTrimFromMouseMove = (e: { clientX: number }) => {
    if (!resizing) return;

    const clip = track.clips.find(c => c.id === resizing.clipId);
    if (!clip) return;

    const deltaX = e.clientX - resizing.startX;
    const deltaTime = deltaX / (50 * zoomLevel);

    if (resizing.side === 'left') {
      const newTrimStart = Math.max(0, Math.min(
        clip.duration - clip.trimEnd - 0.1,
        resizing.initialTrimStart + deltaTime
      ));
      updateClipTrim(track.id, clip.id, newTrimStart, clip.trimEnd);
    } else {
      const newTrimEnd = Math.max(0, Math.min(
        clip.duration - clip.trimStart - 0.1,
        resizing.initialTrimEnd - deltaTime
      ));
      updateClipTrim(track.id, clip.id, clip.trimStart, newTrimEnd);
    }
  };

  const handleResizeMove = (e: React.MouseEvent) => {
    updateTrimFromMouseMove(e);
  };

  const handleResizeEnd = () => {
    setResizing(null);
  };

  useEffect(() => {
    if (!resizing) return;

    const handleGlobalMouseMove = (e: MouseEvent) => {
      updateTrimFromMouseMove(e);
    };

    const handleGlobalMouseUp = () => {
      setResizing(null);
    };

    document.addEventListener('mousemove', handleGlobalMouseMove);
    document.addEventListener('mouseup', handleGlobalMouseUp);

    return () => {
      document.removeEventListener('mousemove', handleGlobalMouseMove);
      document.removeEventListener('mouseup', handleGlobalMouseUp);
    };
  }, [resizing, track.id, zoomLevel, updateClipTrim]);

  const handleClipDragStart = (e: React.DragEvent, clip: any) => {
    const dragData = { clipId: clip.id, trackId: track.id, name: clip.name };

    e.dataTransfer.setData("application/x-timeline-clip", JSON.stringify(dragData));
    e.dataTransfer.effectAllowed = "move";

    // Add visual feedback to the dragged element
    const target = e.currentTarget.parentElement as HTMLElement;
    target.style.opacity = "0.5";
    target.style.transform = "scale(0.95)";
  };

  const handleClipDragEnd = (e: React.DragEvent) => {
    // Reset visual feedback
    const target = e.currentTarget.parentElement as HTMLElement;
    target.style.opacity = "";
    target.style.transform = "";
  };

  const handleTrackDragOver = (e: React.DragEvent) => {
    e.preventDefault();

    // Handle both timeline clips and media items
    const hasTimelineClip = e.dataTransfer.types.includes("application/x-timeline-clip");
    const hasMediaItem = e.dataTransfer.types.includes("application/x-media-item");

    if (!hasTimelineClip && !hasMediaItem) return;

    if (hasMediaItem) {
      try {
        const mediaItemData = e.dataTransfer.getData("application/x-media-item");
        if (mediaItemData) {
          const { type } = JSON.parse(mediaItemData);
          const isCompatible =
            (track.type === "video" && (type === "video" || type === "image")) ||
            (track.type === "audio" && type === "audio");

          if (!isCompatible) {
            e.dataTransfer.dropEffect = "none";
            return;
          }
        }
      } catch (error) {
      }
    }

    // Calculate drop position for overlap checking
    const trackContainer = e.currentTarget.querySelector(".track-clips-container") as HTMLElement;
    let dropTime = 0;
    if (trackContainer) {
      const rect = trackContainer.getBoundingClientRect();
      const mouseX = Math.max(0, e.clientX - rect.left);
      dropTime = mouseX / (50 * zoomLevel);
    }

    // Check for potential overlaps and show appropriate feedback
    let wouldOverlap = false;

    if (hasMediaItem) {
      try {
        const mediaItemData = e.dataTransfer.getData("application/x-media-item");
        if (mediaItemData) {
          const { id } = JSON.parse(mediaItemData);
          const mediaItem = mediaItems.find((item) => item.id === id);
          if (mediaItem) {
            const newClipDuration = mediaItem.duration || 5;
            const snappedTime = Math.round(dropTime * 10) / 10;
            const newClipEnd = snappedTime + newClipDuration;

            wouldOverlap = track.clips.some(existingClip => {
              const existingStart = existingClip.startTime;
              const existingEnd = existingClip.startTime + (existingClip.duration - existingClip.trimStart - existingClip.trimEnd);
              return (snappedTime < existingEnd && newClipEnd > existingStart);
            });
          }
        }
      } catch (error) {
        // Continue with default behavior
      }
    } else if (hasTimelineClip) {
      try {
        const timelineClipData = e.dataTransfer.getData("application/x-timeline-clip");
        if (timelineClipData) {
          const { clipId, trackId: fromTrackId } = JSON.parse(timelineClipData);
          const sourceTrack = tracks.find((t: TimelineTrack) => t.id === fromTrackId);
          const movingClip = sourceTrack?.clips.find((c: any) => c.id === clipId);

          if (movingClip) {
            const movingClipDuration = movingClip.duration - movingClip.trimStart - movingClip.trimEnd;
            const snappedTime = Math.round(dropTime * 10) / 10;
            const movingClipEnd = snappedTime + movingClipDuration;

            wouldOverlap = track.clips.some(existingClip => {
              if (fromTrackId === track.id && existingClip.id === clipId) return false;

              const existingStart = existingClip.startTime;
              const existingEnd = existingClip.startTime + (existingClip.duration - existingClip.trimStart - existingClip.trimEnd);
              return (snappedTime < existingEnd && movingClipEnd > existingStart);
            });
          }
        }
      } catch (error) {
        // Continue with default behavior
      }
    }

    if (wouldOverlap) {
      e.dataTransfer.dropEffect = "none";
      setIsDraggedOver(true);
      setWouldOverlap(true);
      setDropPosition(Math.round(dropTime * 10) / 10);
      return;
    }

    e.dataTransfer.dropEffect = hasTimelineClip ? "move" : "copy";
    setIsDraggedOver(true);
    setWouldOverlap(false);
    setDropPosition(Math.round(dropTime * 10) / 10);
  };

  const handleTrackDragEnter = (e: React.DragEvent) => {
    e.preventDefault();

    const hasTimelineClip = e.dataTransfer.types.includes("application/x-timeline-clip");
    const hasMediaItem = e.dataTransfer.types.includes("application/x-media-item");

    if (!hasTimelineClip && !hasMediaItem) return;

    dragCounterRef.current++;
    setIsDropping(true);
    setIsDraggedOver(true);
  };

  const handleTrackDragLeave = (e: React.DragEvent) => {
    e.preventDefault();

    const hasTimelineClip = e.dataTransfer.types.includes("application/x-timeline-clip");
    const hasMediaItem = e.dataTransfer.types.includes("application/x-media-item");

    if (!hasTimelineClip && !hasMediaItem) return;

    dragCounterRef.current--;

    if (dragCounterRef.current === 0) {
      setIsDropping(false);
      setIsDraggedOver(false);
      setWouldOverlap(false);
      setDropPosition(null);
    }
  };

  const handleTrackDrop = (e: React.DragEvent) => {
    e.preventDefault();

    // Reset all drag states
    dragCounterRef.current = 0;
    setIsDropping(false);
    setIsDraggedOver(false);
    setWouldOverlap(false);
    const currentDropPosition = dropPosition;
    setDropPosition(null);

    const hasTimelineClip = e.dataTransfer.types.includes("application/x-timeline-clip");
    const hasMediaItem = e.dataTransfer.types.includes("application/x-media-item");

    if (!hasTimelineClip && !hasMediaItem) return;

    const trackContainer = e.currentTarget.querySelector(".track-clips-container") as HTMLElement;
    if (!trackContainer) return;

    const rect = trackContainer.getBoundingClientRect();
    const mouseX = Math.max(0, e.clientX - rect.left);
    const newStartTime = mouseX / (50 * zoomLevel);
    const snappedTime = Math.round(newStartTime * 10) / 10;

    try {
      if (hasTimelineClip) {
        // Handle timeline clip movement
        const timelineClipData = e.dataTransfer.getData("application/x-timeline-clip");
        if (!timelineClipData) return;

        const { clipId, trackId: fromTrackId } = JSON.parse(timelineClipData);

        // Find the clip being moved
        const sourceTrack = tracks.find((t: TimelineTrack) => t.id === fromTrackId);
        const movingClip = sourceTrack?.clips.find((c: any) => c.id === clipId);

        if (!movingClip) {
          toast.error("Clip not found");
          return;
        }

        // Check for overlaps with existing clips (excluding the moving clip itself)
        const movingClipDuration = movingClip.duration - movingClip.trimStart - movingClip.trimEnd;
        const movingClipEnd = snappedTime + movingClipDuration;

        const hasOverlap = track.clips.some(existingClip => {
          // Skip the clip being moved if it's on the same track
          if (fromTrackId === track.id && existingClip.id === clipId) return false;

          const existingStart = existingClip.startTime;
          const existingEnd = existingClip.startTime + (existingClip.duration - existingClip.trimStart - existingClip.trimEnd);

          // Check if clips overlap
          return (snappedTime < existingEnd && movingClipEnd > existingStart);
        });

        if (hasOverlap) {
          toast.error("Cannot move clip here - it would overlap with existing clips");
          return;
        }

        if (fromTrackId === track.id) {
          updateClipStartTime(track.id, clipId, snappedTime);
        } else {
          moveClipToTrack(fromTrackId, track.id, clipId);
          requestAnimationFrame(() => {
            updateClipStartTime(track.id, clipId, snappedTime);
          });
        }
      } else if (hasMediaItem) {
        // Handle media item drop
        const mediaItemData = e.dataTransfer.getData("application/x-media-item");
        if (!mediaItemData) return;

        const { id, type } = JSON.parse(mediaItemData);
        const mediaItem = mediaItems.find((item) => item.id === id);

        if (!mediaItem) {
          toast.error("Media item not found");
          return;
        }

        // Check if track type is compatible
        const isCompatible =
          (track.type === "video" && (type === "video" || type === "image")) ||
          (track.type === "audio" && type === "audio");

        if (!isCompatible) {
          toast.error(`Cannot add ${type} to ${track.type} track`);
          return;
        }

        // Check for overlaps with existing clips
        const newClipDuration = mediaItem.duration || 5;
        const newClipEnd = snappedTime + newClipDuration;

        const hasOverlap = track.clips.some(existingClip => {
          const existingStart = existingClip.startTime;
          const existingEnd = existingClip.startTime + (existingClip.duration - existingClip.trimStart - existingClip.trimEnd);

          // Check if clips overlap
          return (snappedTime < existingEnd && newClipEnd > existingStart);
        });

        if (hasOverlap) {
          toast.error("Cannot place clip here - it would overlap with existing clips");
          return;
        }

        addClipToTrack(track.id, {
          mediaId: mediaItem.id,
          name: mediaItem.name,
          duration: mediaItem.duration || 5,
          startTime: snappedTime,
          trimStart: 0,
          trimEnd: 0,
        });

        toast.success(`Added ${mediaItem.name} to ${track.name}`);
      }
    } catch (error) {
      console.error("Error handling drop:", error);
      toast.error("Failed to add media to track");
    }
  };

  const getTrackColor = (type: string) => {
    switch (type) {
      case "video":
        return "bg-blue-500/20 border-blue-500/30";
      case "audio":
        return "bg-green-500/20 border-green-500/30";
      case "effects":
        return "bg-purple-500/20 border-purple-500/30";
      default:
        return "bg-gray-500/20 border-gray-500/30";
    }
  };

  const renderClipContent = (clip: any) => {
    const mediaItem = mediaItems.find((item) => item.id === clip.mediaId);

    if (!mediaItem) {
      return (
        <span className="text-xs text-foreground/80 truncate">{clip.name}</span>
      );
    }

    if (mediaItem.type === "image") {
      return (
        <div className="w-full h-full flex items-center justify-center">
          <img
            src={mediaItem.url}
            alt={mediaItem.name}
            className="w-full h-full object-cover"
          />
        </div>
      );
    }

    if (mediaItem.type === "video" && mediaItem.thumbnailUrl) {
      return (
        <div className="w-full h-full flex items-center gap-2">
          <div className="w-8 h-8 flex-shrink-0">
            <img
              src={mediaItem.thumbnailUrl}
              alt={mediaItem.name}
              className="w-full h-full object-cover rounded-sm"
            />
          </div>
          <span className="text-xs text-foreground/80 truncate flex-1">
            {clip.name}
          </span>
        </div>
      );
    }

    // Fallback for audio or videos without thumbnails
    return (
      <span className="text-xs text-foreground/80 truncate">{clip.name}</span>
    );
  };

  return (
    <div
      className={`w-full h-full transition-all duration-150 ease-out ${isDraggedOver
        ? wouldOverlap
          ? "bg-red-500/15 border-2 border-dashed border-red-400 shadow-lg"
          : "bg-blue-500/15 border-2 border-dashed border-blue-400 shadow-lg"
        : "hover:bg-muted/20"
        }`}
      onDragOver={handleTrackDragOver}
      onDragEnter={handleTrackDragEnter}
      onDragLeave={handleTrackDragLeave}
      onDrop={handleTrackDrop}
      onMouseMove={handleResizeMove}
      onMouseUp={handleResizeEnd}
      onMouseLeave={handleResizeEnd}
    >
      <div className="h-full relative track-clips-container min-w-full">
        {track.clips.length === 0 ? (
          <div className={`h-full w-full rounded-sm border-2 border-dashed flex items-center justify-center text-xs text-muted-foreground transition-colors ${isDropping
            ? wouldOverlap
              ? "border-red-500 bg-red-500/10 text-red-600"
              : "border-blue-500 bg-blue-500/10 text-blue-600"
            : "border-muted/30"
            }`}>
            {isDropping
              ? wouldOverlap
                ? "Cannot drop - would overlap"
                : "Drop clip here"
              : "Drop media here"}
          </div>
        ) : (
          <>
            {track.clips.map((clip) => {
              const effectiveDuration = clip.duration - clip.trimStart - clip.trimEnd;
              const clipWidth = Math.max(80, effectiveDuration * 50 * zoomLevel);
              const clipLeft = clip.startTime * 50 * zoomLevel;

              return (
                <div
                  key={clip.id}
                  className={`timeline-clip absolute h-full rounded-sm border transition-all duration-200 ${getTrackColor(track.type)} flex items-center py-3 min-w-[80px] overflow-hidden group hover:shadow-lg`}
                  style={{ width: `${clipWidth}px`, left: `${clipLeft}px` }}
                >
                  <div
                    className="absolute left-0 top-0 bottom-0 w-2 cursor-w-resize opacity-0 group-hover:opacity-100 transition-opacity bg-blue-500/50 hover:bg-blue-500"
                    onMouseDown={(e) => handleResizeStart(e, clip.id, 'left')}
                  />

                  <div
                    className="flex-1 cursor-grab active:cursor-grabbing"
                    draggable={true}
                    onDragStart={(e) => handleClipDragStart(e, clip)}
                    onDragEnd={handleClipDragEnd}
                  >
                    {renderClipContent(clip)}
                  </div>

                  <div
                    className="absolute right-0 top-0 bottom-0 w-2 cursor-e-resize opacity-0 group-hover:opacity-100 transition-opacity bg-blue-500/50 hover:bg-blue-500"
                    onMouseDown={(e) => handleResizeStart(e, clip.id, 'right')}
                  />
                </div>
              );
            })}

            {/* Drop position indicator */}
            {isDraggedOver && dropPosition !== null && (
              <div
                className={`absolute top-0 bottom-0 w-1 pointer-events-none z-30 transition-all duration-75 ease-out ${wouldOverlap ? "bg-red-500" : "bg-blue-500"
                  }`}
                style={{ left: `${dropPosition * 50 * zoomLevel}px`, transform: 'translateX(-50%)' }}
              >
                <div className={`absolute -top-2 left-1/2 transform -translate-x-1/2 w-3 h-3 rounded-full border-2 border-white shadow-md ${wouldOverlap ? "bg-red-500" : "bg-blue-500"
                  }`} />
                <div className={`absolute -bottom-2 left-1/2 transform -translate-x-1/2 w-3 h-3 rounded-full border-2 border-white shadow-md ${wouldOverlap ? "bg-red-500" : "bg-blue-500"
                  }`} />
                <div className={`absolute top-1/2 left-1/2 transform -translate-x-1/2 -translate-y-1/2 text-xs text-white px-1 py-0.5 rounded whitespace-nowrap ${wouldOverlap ? "bg-red-500" : "bg-blue-500"
                  }`}>
                  {wouldOverlap ? "⚠️" : ""}{dropPosition.toFixed(1)}s
                </div>
              </div>
            )}
          </>
        )}
      </div>
    </div>
  );
}