audio-ui/app/multi-track-demo/page.tsx

'use client';

import * as React from 'react';
import { TrackList } from '@/components/tracks/TrackList';
import { useMultiTrack } from '@/lib/hooks/useMultiTrack';
import { useMultiTrackPlayer } from '@/lib/hooks/useMultiTrackPlayer';
import { Button } from '@/components/ui/Button';
import { Play, Pause, Square, SkipBack } from 'lucide-react';
import { formatDuration } from '@/lib/audio/decoder';

export default function MultiTrackDemoPage() {
  const {
    tracks,
    addTrack,
    addTrackFromBuffer,
    removeTrack,
    updateTrack,
    clearTracks,
  } = useMultiTrack();

  const {
    isPlaying,
    currentTime,
    duration,
    play,
    pause,
    stop,
    seek,
    togglePlayPause,
  } = useMultiTrackPlayer(tracks);

  const [zoom, setZoom] = React.useState(1);

  return (
    <div className="h-screen flex flex-col bg-background">
      {/* Header */}
      <div className="h-14 border-b border-border bg-card flex items-center justify-between px-4">
        <h1 className="text-lg font-semibold">Multi-Track Demo</h1>
        <div className="flex items-center gap-2">
          <Button
            variant="outline"
            size="sm"
            onClick={clearTracks}
            disabled={tracks.length === 0}
          >
            Clear All Tracks
          </Button>
          <Button
            variant="outline"
            size="sm"
            onClick={() => setZoom((z) => Math.max(0.5, z - 0.5))}
          >
            Zoom Out
          </Button>
          <Button
            variant="outline"
            size="sm"
            onClick={() => setZoom((z) => Math.min(10, z + 0.5))}
          >
            Zoom In
          </Button>
        </div>
      </div>

      {/* Track List */}
      <div className="flex-1 overflow-hidden">
        <TrackList
          tracks={tracks}
          zoom={zoom}
          currentTime={currentTime}
          duration={duration}
          onAddTrack={() => addTrack()}
          onImportTrack={(buffer, name) => addTrackFromBuffer(buffer, name)}
          onRemoveTrack={removeTrack}
          onUpdateTrack={updateTrack}
          onSeek={seek}
        />
      </div>

      {/* Playback Controls */}
      <div className="h-16 border-t border-border bg-card flex items-center justify-between px-4">
        <div className="flex items-center gap-2">
          <Button
            variant="outline"
            size="icon"
            onClick={stop}
            disabled={!duration}
            title="Stop"
          >
            <Square className="h-4 w-4" />
          </Button>
          <Button
            variant="outline"
            size="icon"
            onClick={togglePlayPause}
            disabled={!duration}
            title={isPlaying ? 'Pause' : 'Play'}
          >
            {isPlaying ? (
              <Pause className="h-4 w-4" />
            ) : (
              <Play className="h-4 w-4" />
            )}
          </Button>
          <Button
            variant="outline"
            size="icon"
            onClick={() => seek(0)}
            disabled={!duration}
            title="Skip to Start"
          >
            <SkipBack className="h-4 w-4" />
          </Button>
        </div>

        <div className="flex items-center gap-4">
          <span className="text-sm font-mono">
            {formatDuration(currentTime)} / {formatDuration(duration)}
          </span>
          <span className="text-sm text-muted-foreground">
            {tracks.length} {tracks.length === 1 ? 'track' : 'tracks'}
          </span>
        </div>
      </div>
    </div>
  );
}