'use client';

import * as React from 'react';
import {
  FileAudio,
  History,
  Info,
  ChevronLeft,
  ChevronRight,
  Upload,
  Download,
  X,
  Sparkles,
  Link2,
  FolderOpen,
  Trash2,
} from 'lucide-react';
import { Button } from '@/components/ui/Button';
import { cn } from '@/lib/utils/cn';
import { formatDuration } from '@/lib/audio/decoder';
import type { Selection } from '@/types/selection';
import type { HistoryState } from '@/lib/history/history-manager';
import type { EffectChain, ChainEffect, EffectPreset } from '@/lib/audio/effects/chain';
import { EffectRack } from '@/components/effects/EffectRack';
import { PresetManager } from '@/components/effects/PresetManager';

export interface SidePanelProps {
  // File info
  fileName: string | null;
  audioBuffer: AudioBuffer | null;
  onFileSelect: (file: File) => void;
  onClear: () => void;

  // Selection info
  selection: Selection | null;

  // History info
  historyState: HistoryState;

  // Effect chain
  effectChain: EffectChain;
  effectPresets: EffectPreset[];
  onToggleEffect: (effectId: string) => void;
  onRemoveEffect: (effectId: string) => void;
  onReorderEffects: (fromIndex: number, toIndex: number) => void;
  onSavePreset: (preset: EffectPreset) => void;
  onLoadPreset: (preset: EffectPreset) => void;
  onDeletePreset: (presetId: string) => void;
  onClearChain: () => void;

  // Effects handlers
  onNormalize: () => void;
  onFadeIn: () => void;
  onFadeOut: () => void;
  onReverse: () => void;
  onLowPassFilter: () => void;
  onHighPassFilter: () => void;
  onBandPassFilter: () => void;
  onCompressor: () => void;
  onLimiter: () => void;
  onGate: () => void;
  onDelay: () => void;
  onReverb: () => void;
  onChorus: () => void;
  onFlanger: () => void;
  onPhaser: () => void;
  onPitchShift: () => void;
  onTimeStretch: () => void;
  onDistortion: () => void;
  onBitcrusher: () => void;

  className?: string;
}

export function SidePanel({
  fileName,
  audioBuffer,
  onFileSelect,
  onClear,
  selection,
  historyState,
  effectChain,
  effectPresets,
  onToggleEffect,
  onRemoveEffect,
  onReorderEffects,
  onSavePreset,
  onLoadPreset,
  onDeletePreset,
  onClearChain,
  onNormalize,
  onFadeIn,
  onFadeOut,
  onReverse,
  onLowPassFilter,
  onHighPassFilter,
  onBandPassFilter,
  onCompressor,
  onLimiter,
  onGate,
  onDelay,
  onReverb,
  onChorus,
  onFlanger,
  onPhaser,
  onPitchShift,
  onTimeStretch,
  onDistortion,
  onBitcrusher,
  className,
}: SidePanelProps) {
  const [isCollapsed, setIsCollapsed] = React.useState(false);
  const [activeTab, setActiveTab] = React.useState<'file' | 'chain' | 'history' | 'info' | 'effects'>('file');
  const [presetDialogOpen, setPresetDialogOpen] = React.useState(false);
  const fileInputRef = React.useRef<HTMLInputElement>(null);

  const handleFileClick = () => {
    fileInputRef.current?.click();
  };

  const handleFileChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0];
    if (file) {
      onFileSelect(file);
    }
  };

  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-64 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 === 'file' ? 'secondary' : 'ghost'}
            size="icon-sm"
            onClick={() => setActiveTab('file')}
            title="File"
          >
            <FileAudio className="h-4 w-4" />
          </Button>
          <Button
            variant={activeTab === 'chain' ? 'secondary' : 'ghost'}
            size="icon-sm"
            onClick={() => setActiveTab('chain')}
            title="Effect Chain"
          >
            <Link2 className="h-4 w-4" />
          </Button>
          <Button
            variant={activeTab === 'effects' ? 'secondary' : 'ghost'}
            size="icon-sm"
            onClick={() => setActiveTab('effects')}
            title="Effects"
          >
            <Sparkles className="h-4 w-4" />
          </Button>
          <Button
            variant={activeTab === 'history' ? 'secondary' : 'ghost'}
            size="icon-sm"
            onClick={() => setActiveTab('history')}
            title="History"
          >
            <History className="h-4 w-4" />
          </Button>
          <Button
            variant={activeTab === 'info' ? 'secondary' : 'ghost'}
            size="icon-sm"
            onClick={() => setActiveTab('info')}
            title="Info"
          >
            <Info className="h-4 w-4" />
          </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 === 'file' && (
          <>
            <div className="space-y-2">
              <h3 className="text-xs font-semibold text-muted-foreground uppercase">
                Audio File
              </h3>
              {audioBuffer ? (
                <div className="space-y-2">
                  <div className="p-2 bg-secondary/30 rounded text-xs">
                    <div className="font-medium text-foreground truncate" title={fileName || 'Unknown'}>
                      {fileName || 'Unknown'}
                    </div>
                    <div className="text-muted-foreground mt-1">
                      Duration: {formatDuration(audioBuffer.duration)}
                    </div>
                    <div className="text-muted-foreground">
                      Channels: {audioBuffer.numberOfChannels}
                    </div>
                    <div className="text-muted-foreground">
                      Sample Rate: {audioBuffer.sampleRate} Hz
                    </div>
                  </div>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onClear}
                    className="w-full"
                  >
                    <X className="h-3.5 w-3.5 mr-1.5" />
                    Clear File
                  </Button>
                </div>
              ) : (
                <div className="space-y-2">
                  <input
                    ref={fileInputRef}
                    type="file"
                    accept="audio/*"
                    onChange={handleFileChange}
                    className="hidden"
                  />
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={handleFileClick}
                    className="w-full"
                  >
                    <Upload className="h-3.5 w-3.5 mr-1.5" />
                    Load Audio File
                  </Button>
                  <div className="text-xs text-muted-foreground">
                    Or drag and drop an audio file onto the waveform area.
                  </div>
                </div>
              )}
            </div>
          </>
        )}

        {activeTab === 'chain' && (
          <div className="space-y-2">
            <div className="flex items-center justify-between">
              <h3 className="text-xs font-semibold text-muted-foreground uppercase">
                Effect Chain
              </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>
                {effectChain.effects.length > 0 && (
                  <Button
                    variant="ghost"
                    size="icon-sm"
                    onClick={onClearChain}
                    title="Clear all effects"
                  >
                    <Trash2 className="h-4 w-4 text-destructive" />
                  </Button>
                )}
              </div>
            </div>
            <EffectRack
              chain={effectChain}
              onToggleEffect={onToggleEffect}
              onRemoveEffect={onRemoveEffect}
              onReorderEffects={onReorderEffects}
            />
            <PresetManager
              open={presetDialogOpen}
              onClose={() => setPresetDialogOpen(false)}
              currentChain={effectChain}
              presets={effectPresets}
              onSavePreset={onSavePreset}
              onLoadPreset={onLoadPreset}
              onDeletePreset={onDeletePreset}
              onExportPreset={() => {}}
              onImportPreset={(preset) => onSavePreset(preset)}
            />
          </div>
        )}

        {activeTab === 'history' && (
          <div className="space-y-2">
            <h3 className="text-xs font-semibold text-muted-foreground uppercase">
              Edit History
            </h3>
            {historyState.historySize > 0 ? (
              <div className="space-y-1 text-xs">
                <div className="p-2 bg-secondary/30 rounded">
                  <div className="text-foreground">
                    {historyState.historySize} action{historyState.historySize !== 1 ? 's' : ''}
                  </div>
                  {historyState.undoDescription && (
                    <div className="text-muted-foreground mt-1">
                      Next undo: {historyState.undoDescription}
                    </div>
                  )}
                  {historyState.redoDescription && (
                    <div className="text-muted-foreground mt-1">
                      Next redo: {historyState.redoDescription}
                    </div>
                  )}
                </div>
              </div>
            ) : (
              <div className="text-xs text-muted-foreground">
                No history available. Edit operations will appear here.
              </div>
            )}
          </div>
        )}

        {activeTab === 'info' && (
          <div className="space-y-2">
            <h3 className="text-xs font-semibold text-muted-foreground uppercase">
              Selection Info
            </h3>
            {selection ? (
              <div className="p-2 bg-secondary/30 rounded text-xs">
                <div className="text-foreground font-medium">Selection Active</div>
                <div className="text-muted-foreground mt-1">
                  Duration: {formatDuration(selection.end - selection.start)}
                </div>
                <div className="text-muted-foreground">
                  Start: {formatDuration(selection.start)}
                </div>
                <div className="text-muted-foreground">
                  End: {formatDuration(selection.end)}
                </div>
              </div>
            ) : (
              <div className="text-xs text-muted-foreground">
                No selection. Drag on the waveform to select a region.
              </div>
            )}
          </div>
        )}

        {activeTab === 'effects' && (
          <div className="space-y-3">
            <div className="space-y-2">
              <h3 className="text-xs font-semibold text-muted-foreground uppercase">
                Basic Effects
              </h3>
              {audioBuffer ? (
                <div className="space-y-1.5">
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onNormalize}
                    className="w-full justify-start text-xs"
                  >
                    Normalize
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onFadeIn}
                    className="w-full justify-start text-xs"
                  >
                    Fade In
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onFadeOut}
                    className="w-full justify-start text-xs"
                  >
                    Fade Out
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onReverse}
                    className="w-full justify-start text-xs"
                  >
                    Reverse
                  </Button>
                </div>
              ) : (
                <div className="text-xs text-muted-foreground">
                  Load an audio file to apply effects.
                </div>
              )}
            </div>

            <div className="space-y-2">
              <h3 className="text-xs font-semibold text-muted-foreground uppercase">
                Filters
              </h3>
              {audioBuffer ? (
                <div className="space-y-1.5">
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onLowPassFilter}
                    className="w-full justify-start text-xs"
                  >
                    Low-Pass Filter
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onHighPassFilter}
                    className="w-full justify-start text-xs"
                  >
                    High-Pass Filter
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onBandPassFilter}
                    className="w-full justify-start text-xs"
                  >
                    Band-Pass Filter
                  </Button>
                </div>
              ) : (
                <div className="text-xs text-muted-foreground">
                  Load an audio file to apply filters.
                </div>
              )}
            </div>

            <div className="space-y-2">
              <h3 className="text-xs font-semibold text-muted-foreground uppercase">
                Dynamics Processing
              </h3>
              {audioBuffer ? (
                <div className="space-y-1.5">
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onCompressor}
                    className="w-full justify-start text-xs"
                  >
                    Compressor
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onLimiter}
                    className="w-full justify-start text-xs"
                  >
                    Limiter
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onGate}
                    className="w-full justify-start text-xs"
                  >
                    Gate/Expander
                  </Button>
                </div>
              ) : (
                <div className="text-xs text-muted-foreground">
                  Load an audio file to apply dynamics processing.
                </div>
              )}
            </div>

            <div className="space-y-2">
              <h3 className="text-xs font-semibold text-muted-foreground uppercase">
                Time-Based Effects
              </h3>
              {audioBuffer ? (
                <div className="space-y-1.5">
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onDelay}
                    className="w-full justify-start text-xs"
                  >
                    Delay/Echo
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onReverb}
                    className="w-full justify-start text-xs"
                  >
                    Reverb
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onChorus}
                    className="w-full justify-start text-xs"
                  >
                    Chorus
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onFlanger}
                    className="w-full justify-start text-xs"
                  >
                    Flanger
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onPhaser}
                    className="w-full justify-start text-xs"
                  >
                    Phaser
                  </Button>
                </div>
              ) : (
                <div className="text-xs text-muted-foreground">
                  Load an audio file to apply time-based effects.
                </div>
              )}
            </div>

            <div className="space-y-2">
              <h3 className="text-xs font-semibold text-muted-foreground uppercase">
                Advanced Effects
              </h3>
              {audioBuffer ? (
                <div className="space-y-1.5">
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onPitchShift}
                    className="w-full justify-start text-xs"
                  >
                    Pitch Shifter
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onTimeStretch}
                    className="w-full justify-start text-xs"
                  >
                    Time Stretch
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onDistortion}
                    className="w-full justify-start text-xs"
                  >
                    Distortion
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={onBitcrusher}
                    className="w-full justify-start text-xs"
                  >
                    Bitcrusher
                  </Button>
                </div>
              ) : (
                <div className="text-xs text-muted-foreground">
                  Load an audio file to apply advanced effects.
                </div>
              )}
            </div>
          </div>
        )}
      </div>
    </div>
  );
}