'use client';

import * as React from 'react';
import { Music } from 'lucide-react';
import { PlaybackControls } from './PlaybackControls';
import { SidePanel } from '@/components/layout/SidePanel';
import { ThemeToggle } from '@/components/layout/ThemeToggle';
import { CommandPalette } from '@/components/ui/CommandPalette';
import type { CommandAction } from '@/components/ui/CommandPalette';
import { useMultiTrack } from '@/lib/hooks/useMultiTrack';
import { useMultiTrackPlayer } from '@/lib/hooks/useMultiTrackPlayer';
import { useEffectChain } from '@/lib/hooks/useEffectChain';
import { useToast } from '@/components/ui/Toast';
import { TrackList } from '@/components/tracks/TrackList';
import { ImportTrackDialog } from '@/components/tracks/ImportTrackDialog';
import { formatDuration } from '@/lib/audio/decoder';

export function AudioEditor() {
  const [importDialogOpen, setImportDialogOpen] = React.useState(false);
  const [selectedTrackId, setSelectedTrackId] = React.useState<string | null>(null);
  const [zoom, setZoom] = React.useState(1);

  const { addToast } = useToast();

  // Multi-track hooks
  const {
    tracks,
    addTrack,
    addTrackFromBuffer,
    removeTrack,
    updateTrack,
    clearTracks,
  } = useMultiTrack();

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

  // Effect chain (for selected track)
  const {
    chain: effectChain,
    presets: effectPresets,
    toggleEffectEnabled,
    removeEffect,
    reorder: reorderEffects,
    clearChain,
    savePreset,
    loadPresetToChain,
    deletePreset,
  } = useEffectChain();

  // Multi-track handlers
  const handleImportTracks = () => {
    setImportDialogOpen(true);
  };

  const handleImportTrack = (buffer: AudioBuffer, name: string) => {
    addTrackFromBuffer(buffer, name);
  };

  const handleClearTracks = () => {
    clearTracks();
    setSelectedTrackId(null);
    addToast({
      title: 'Tracks Cleared',
      description: 'All tracks have been removed',
      variant: 'info',
      duration: 2000,
    });
  };

  const handleRemoveTrack = (trackId: string) => {
    removeTrack(trackId);
    if (selectedTrackId === trackId) {
      setSelectedTrackId(null);
    }
  };

  // Zoom controls
  const handleZoomIn = () => {
    setZoom((prev) => Math.min(20, prev + 1));
  };

  const handleZoomOut = () => {
    setZoom((prev) => Math.max(1, prev - 1));
  };

  const handleFitToView = () => {
    setZoom(1);
  };

  // Keyboard shortcuts
  React.useEffect(() => {
    const handleKeyDown = (e: KeyboardEvent) => {
      // Spacebar for play/pause - only if not typing in an input
      if (e.code === 'Space' && !(e.target instanceof HTMLInputElement || e.target instanceof HTMLTextAreaElement)) {
        e.preventDefault();
        togglePlayPause();
      }
    };

    window.addEventListener('keydown', handleKeyDown);
    return () => window.removeEventListener('keydown', handleKeyDown);
  }, [togglePlayPause]);

  // Find selected track
  const selectedTrack = tracks.find((t) => t.id === selectedTrackId);

  // Command palette actions
  const commandActions: CommandAction[] = React.useMemo(() => {
    const actions: CommandAction[] = [
      // Playback
      {
        id: 'play',
        label: 'Play',
        description: 'Start playback',
        shortcut: 'Space',
        category: 'playback',
        action: play,
      },
      {
        id: 'pause',
        label: 'Pause',
        description: 'Pause playback',
        shortcut: 'Space',
        category: 'playback',
        action: pause,
      },
      {
        id: 'stop',
        label: 'Stop',
        description: 'Stop playback',
        category: 'playback',
        action: stop,
      },
      // View
      {
        id: 'zoom-in',
        label: 'Zoom In',
        description: 'Zoom in on waveforms',
        category: 'view',
        action: handleZoomIn,
      },
      {
        id: 'zoom-out',
        label: 'Zoom Out',
        description: 'Zoom out on waveforms',
        category: 'view',
        action: handleZoomOut,
      },
      {
        id: 'fit-to-view',
        label: 'Fit to View',
        description: 'Reset zoom to fit all tracks',
        category: 'view',
        action: handleFitToView,
      },
      // Tracks
      {
        id: 'add-track',
        label: 'Add Empty Track',
        description: 'Create a new empty track',
        category: 'tracks',
        action: () => addTrack(),
      },
      {
        id: 'import-tracks',
        label: 'Import Audio Files',
        description: 'Import multiple audio files as tracks',
        category: 'tracks',
        action: handleImportTracks,
      },
      {
        id: 'clear-tracks',
        label: 'Clear All Tracks',
        description: 'Remove all tracks',
        category: 'tracks',
        action: handleClearTracks,
      },
    ];
    return actions;
  }, [play, pause, stop, handleZoomIn, handleZoomOut, handleFitToView, handleImportTracks, handleClearTracks, addTrack]);

  // Keyboard shortcuts
  React.useEffect(() => {
    const handleKeyDown = (e: KeyboardEvent) => {
      // Prevent shortcuts if typing in an input
      const isTyping = e.target instanceof HTMLInputElement || e.target instanceof HTMLTextAreaElement;

      // Spacebar: Play/Pause (always, unless typing in an input)
      if (e.code === 'Space' && !isTyping) {
        e.preventDefault();
        togglePlayPause();
        return;
      }

      if (isTyping) return;

      // Escape: Clear selection
      if (e.key === 'Escape') {
        e.preventDefault();
        setSelectedTrackId(null);
      }
    };

    window.addEventListener('keydown', handleKeyDown);
    return () => window.removeEventListener('keydown', handleKeyDown);
  }, [togglePlayPause]);

  return (
    <>
      {/* Compact Header */}
      <header className="flex items-center justify-between px-4 py-2 border-b border-border bg-card flex-shrink-0 gap-4">
        {/* Left: Logo */}
        <div className="flex items-center gap-2 flex-shrink-0">
          <Music className="h-5 w-5 text-primary" />
          <h1 className="text-lg font-bold text-foreground">Audio UI</h1>
        </div>

        {/* Right: Command Palette + Theme Toggle */}
        <div className="flex items-center gap-2 flex-shrink-0">
          <CommandPalette actions={commandActions} />
          <ThemeToggle />
        </div>
      </header>

      {/* Main content area */}
      <div className="flex flex-1 overflow-hidden">
        {/* Side Panel */}
        <SidePanel
          tracks={tracks}
          selectedTrackId={selectedTrackId}
          onSelectTrack={setSelectedTrackId}
          onAddTrack={addTrack}
          onImportTracks={handleImportTracks}
          onUpdateTrack={updateTrack}
          onRemoveTrack={handleRemoveTrack}
          onClearTracks={handleClearTracks}
          effectChain={effectChain}
          effectPresets={effectPresets}
          onToggleEffect={toggleEffectEnabled}
          onRemoveEffect={removeEffect}
          onReorderEffects={reorderEffects}
          onSavePreset={savePreset}
          onLoadPreset={loadPresetToChain}
          onDeletePreset={deletePreset}
          onClearChain={clearChain}
        />

        {/* Main canvas area */}
        <main className="flex-1 flex flex-col overflow-hidden bg-background">
          {/* Multi-Track View */}
          <div className="flex-1 flex flex-col overflow-hidden">
            <TrackList
              tracks={tracks}
              zoom={zoom}
              currentTime={currentTime}
              duration={duration}
              selectedTrackId={selectedTrackId}
              onSelectTrack={setSelectedTrackId}
              onAddTrack={addTrack}
              onImportTrack={handleImportTrack}
              onRemoveTrack={handleRemoveTrack}
              onUpdateTrack={updateTrack}
              onSeek={seek}
            />
          </div>

          {/* Multi-Track Playback Controls */}
          <div className="border-t border-border bg-card p-3 flex justify-center">
            <PlaybackControls
              isPlaying={isPlaying}
              isPaused={!isPlaying}
              currentTime={currentTime}
              duration={duration}
              volume={1}
              onPlay={play}
              onPause={pause}
              onStop={stop}
              onSeek={seek}
              onVolumeChange={() => {}}
              currentTimeFormatted={formatDuration(currentTime)}
              durationFormatted={formatDuration(duration)}
            />
          </div>
        </main>
      </div>

      {/* Import Track Dialog */}
      <ImportTrackDialog
        open={importDialogOpen}
        onClose={() => setImportDialogOpen(false)}
        onImportTrack={handleImportTrack}
      />
    </>
  );
}