'use client';

import * as React from 'react';
import {
  ChevronLeft,
  ChevronRight,
  Upload,
  Plus,
  Trash2,
  Link2,
  FolderOpen,
  Music2,
} from 'lucide-react';
import { Button } from '@/components/ui/Button';
import { cn } from '@/lib/utils/cn';
import type { Track } from '@/types/track';
import type { EffectChain, EffectPreset } from '@/lib/audio/effects/chain';
import { EffectRack } from '@/components/effects/EffectRack';
import { PresetManager } from '@/components/effects/PresetManager';

export interface SidePanelProps {
  tracks: Track[];
  selectedTrackId: string | null;
  onSelectTrack: (trackId: string | null) => void;
  onAddTrack: () => void;
  onImportTracks: () => void;
  onUpdateTrack: (trackId: string, updates: Partial<Track>) => void;
  onRemoveTrack: (trackId: string) => void;
  onClearTracks: () => void;

  // Track effect chain (for selected track)
  trackEffectChain: EffectChain | null;
  onToggleTrackEffect: (effectId: string) => void;
  onRemoveTrackEffect: (effectId: string) => void;
  onReorderTrackEffects: (fromIndex: number, toIndex: number) => void;
  onClearTrackChain: () => void;

  // Master effect chain
  masterEffectChain: EffectChain;
  masterEffectPresets: EffectPreset[];
  onToggleMasterEffect: (effectId: string) => void;
  onRemoveMasterEffect: (effectId: string) => void;
  onReorderMasterEffects: (fromIndex: number, toIndex: number) => void;
  onSaveMasterPreset: (preset: EffectPreset) => void;
  onLoadMasterPreset: (preset: EffectPreset) => void;
  onDeleteMasterPreset: (presetId: string) => void;
  onClearMasterChain: () => void;

  className?: string;
}

export function SidePanel({
  tracks,
  selectedTrackId,
  onSelectTrack,
  onAddTrack,
  onImportTracks,
  onUpdateTrack,
  onRemoveTrack,
  onClearTracks,
  trackEffectChain,
  onToggleTrackEffect,
  onRemoveTrackEffect,
  onReorderTrackEffects,
  onClearTrackChain,
  masterEffectChain,
  masterEffectPresets,
  onToggleMasterEffect,
  onRemoveMasterEffect,
  onReorderMasterEffects,
  onSaveMasterPreset,
  onLoadMasterPreset,
  onDeleteMasterPreset,
  onClearMasterChain,
  className,
}: SidePanelProps) {
  const [isCollapsed, setIsCollapsed] = React.useState(false);
  const [activeTab, setActiveTab] = React.useState<'tracks' | 'master'>('tracks');
  const [presetDialogOpen, setPresetDialogOpen] = React.useState(false);

  const selectedTrack = tracks.find((t) => t.id === selectedTrackId);

  if (isCollapsed) {
    return (
      <div
        className={cn(
          'w-12 bg-card border-r border-border flex flex-col items-center py-2',
          className
        )}
      >
        <Button
          variant="ghost"
          size="icon-sm"
          onClick={() => setIsCollapsed(false)}
          title="Expand Side Panel"
        >
          <ChevronRight className="h-4 w-4" />
        </Button>
      </div>
    );
  }

  return (
    <div className={cn('w-80 bg-card border-r border-border flex flex-col', className)}>
      {/* Header */}
      <div className="flex items-center justify-between p-2 border-b border-border">
        <div className="flex items-center gap-1">
          <Button
            variant={activeTab === 'tracks' ? 'secondary' : 'ghost'}
            size="sm"
            onClick={() => setActiveTab('tracks')}
            title="Tracks"
          >
            <Music2 className="h-4 w-4 mr-1.5" />
            Tracks
          </Button>
          <Button
            variant={activeTab === 'master' ? 'secondary' : 'ghost'}
            size="sm"
            onClick={() => setActiveTab('master')}
            title="Master"
          >
            <Link2 className="h-4 w-4 mr-1.5 text-primary" />
            Master
          </Button>
        </div>
        <Button
          variant="ghost"
          size="icon-sm"
          onClick={() => setIsCollapsed(true)}
          title="Collapse Side Panel"
        >
          <ChevronLeft className="h-4 w-4" />
        </Button>
      </div>

      {/* Content */}
      <div className="flex-1 overflow-y-auto p-3 space-y-3 custom-scrollbar">
        {activeTab === 'tracks' && (
          <>
            {/* Track Actions */}
            <div className="space-y-2">
              <h3 className="text-xs font-semibold text-muted-foreground uppercase">
                Track Management
              </h3>
              <div className="flex gap-2">
                <Button
                  variant="outline"
                  size="sm"
                  onClick={onAddTrack}
                  className="flex-1"
                >
                  <Plus className="h-3.5 w-3.5 mr-1.5" />
                  Add Track
                </Button>
                <Button
                  variant="outline"
                  size="sm"
                  onClick={onImportTracks}
                  className="flex-1"
                >
                  <Upload className="h-3.5 w-3.5 mr-1.5" />
                  Import
                </Button>
              </div>
              {tracks.length > 0 && (
                <Button
                  variant="outline"
                  size="sm"
                  onClick={onClearTracks}
                  className="w-full"
                >
                  <Trash2 className="h-3.5 w-3.5 mr-1.5 text-destructive" />
                  Clear All Tracks
                </Button>
              )}
            </div>

            {/* Track List Summary */}
            {tracks.length > 0 ? (
              <div className="space-y-2">
                <div className="flex items-center justify-between">
                  <h3 className="text-xs font-semibold text-muted-foreground uppercase">
                    Tracks ({tracks.length})
                  </h3>
                  {selectedTrack && (
                    <span className="text-xs text-primary">
                      {String(selectedTrack.name || 'Untitled Track')} selected
                    </span>
                  )}
                </div>
                <div className="text-xs text-muted-foreground">
                  <p>
                    {selectedTrack
                      ? 'Track controls are on the left of each track. Effects for the selected track are shown below.'
                      : 'Click a track\'s waveform to select it and edit its effects below.'}
                  </p>
                </div>
              </div>
            ) : (
              <div className="text-center py-8">
                <Music2 className="h-12 w-12 mx-auto text-muted-foreground/50 mb-2" />
                <p className="text-sm text-muted-foreground mb-4">
                  No tracks yet. Add or import audio files to get started.
                </p>
              </div>
            )}

            {/* Selected Track Effects */}
            {selectedTrack && (
              <div className="space-y-2 pt-3 border-t border-border">
                <div className="flex items-center justify-between">
                  <h3 className="text-xs font-semibold text-muted-foreground uppercase">
                    Track Effects
                  </h3>
                  {trackEffectChain && trackEffectChain.effects.length > 0 && (
                    <Button
                      variant="ghost"
                      size="icon-sm"
                      onClick={onClearTrackChain}
                      title="Clear all effects"
                    >
                      <Trash2 className="h-4 w-4 text-destructive" />
                    </Button>
                  )}
                </div>
                <EffectRack
                  chain={trackEffectChain!}
                  onToggleEffect={onToggleTrackEffect}
                  onRemoveEffect={onRemoveTrackEffect}
                  onReorderEffects={onReorderTrackEffects}
                />
              </div>
            )}
          </>
        )}

        {activeTab === 'master' && (
          <>
            {/* Master Channel Info */}
            <div className="space-y-2">
              <h3 className="text-xs font-semibold text-muted-foreground uppercase">
                Master Channel
              </h3>
              <div className="text-xs text-muted-foreground">
                <p>
                  Master effects are applied to the final mix of all tracks.
                </p>
              </div>
            </div>

            {/* Master Effects */}
            <div className="space-y-2 pt-3 border-t border-border">
              <div className="flex items-center justify-between">
                <h3 className="text-xs font-semibold text-muted-foreground uppercase">
                  Master Effects
                </h3>
                <div className="flex gap-1">
                  <Button
                    variant="ghost"
                    size="icon-sm"
                    onClick={() => setPresetDialogOpen(true)}
                    title="Manage presets"
                  >
                    <FolderOpen className="h-4 w-4" />
                  </Button>
                  {masterEffectChain.effects.length > 0 && (
                    <Button
                      variant="ghost"
                      size="icon-sm"
                      onClick={onClearMasterChain}
                      title="Clear all effects"
                    >
                      <Trash2 className="h-4 w-4 text-destructive" />
                    </Button>
                  )}
                </div>
              </div>

              <EffectRack
                chain={masterEffectChain}
                onToggleEffect={onToggleMasterEffect}
                onRemoveEffect={onRemoveMasterEffect}
                onReorderEffects={onReorderMasterEffects}
              />
              <PresetManager
                open={presetDialogOpen}
                onClose={() => setPresetDialogOpen(false)}
                currentChain={masterEffectChain}
                presets={masterEffectPresets}
                onSavePreset={onSaveMasterPreset}
                onLoadPreset={onLoadMasterPreset}
                onDeletePreset={onDeleteMasterPreset}
                onExportPreset={() => {}}
                onImportPreset={(preset) => onSaveMasterPreset(preset)}
              />
            </div>
          </>
        )}
      </div>
    </div>
  );
}