'use client';

import { useCallback, useRef, useState } from 'react';
import { Drum, Music, Cloud, Volume2, VolumeX } from 'lucide-react';
import { Toggle } from '@/components/ui/toggle';
import { TimelineRuler } from './TimelineRuler';
import { Playhead } from './Playhead';
import { TimeDisplay } from './TimeDisplay';
import { DurationSelector } from './DurationSelector';
import { LoopBracket } from './LoopBracket';
import { SectionTrack } from './SectionTrack';
import { KeyframeTrack } from './KeyframeTrack';
import { PatternPicker } from './PatternPicker';
import { ProgressionPicker } from './ProgressionPicker';
import { MuteTrack } from './MuteTrack';
import { AutomationLane } from './AutomationLane';
import { cn } from '@/lib/utils';
import {
  TimelineState,
  LayerName,
  PatternKeyframe,
  ChordKeyframe,
  SectionType,
} from '@/types/audio';

interface TimelineProps {
  state: TimelineState;
  bpm: number;
  isPlaying: boolean;
  pixelsPerBar?: number;
  onDurationChange: (bars: number) => void;
  onSeek: (bar: number, beat: number) => void;
  onLoopRegionChange: (start: number, end: number, enabled: boolean) => void;
  onSectionAdd: (type: SectionType, startBar: number, endBar: number) => void;
  onSectionResize: (id: string, startBar: number, endBar: number) => void;
  onSectionMove: (id: string, startBar: number) => void;
  onSectionDelete: (id: string) => void;
  onDrumKeyframeAdd: (bar: number, patternIndex: number) => void;
  onDrumKeyframeUpdate: (id: string, patternIndex: number) => void;
  onDrumKeyframeDelete: (id: string) => void;
  onChordKeyframeAdd: (bar: number, progressionIndex: number) => void;
  onChordKeyframeUpdate: (id: string, progressionIndex: number) => void;
  onChordKeyframeDelete: (id: string) => void;
  onMuteKeyframeToggle: (layer: LayerName, bar: number) => void;
  onAutomationPointAdd: (
    layer: LayerName,
    bar: number,
    beat: number,
    value: number
  ) => void;
  onAutomationPointUpdate: (
    layer: LayerName,
    id: string,
    bar: number,
    beat: number,
    value: number
  ) => void;
  onAutomationPointDelete: (layer: LayerName, id: string) => void;
  className?: string;
}

const PIXELS_PER_BAR = 48;

export function Timeline({
  state,
  bpm,
  isPlaying,
  pixelsPerBar = PIXELS_PER_BAR,
  onDurationChange,
  onSeek,
  onLoopRegionChange,
  onSectionAdd,
  onSectionResize,
  onSectionMove,
  onSectionDelete,
  onDrumKeyframeAdd,
  onDrumKeyframeUpdate,
  onDrumKeyframeDelete,
  onChordKeyframeAdd,
  onChordKeyframeUpdate,
  onChordKeyframeDelete,
  onMuteKeyframeToggle,
  onAutomationPointAdd,
  onAutomationPointUpdate,
  onAutomationPointDelete,
  className,
}: TimelineProps) {
  const containerRef = useRef<HTMLDivElement>(null);
  const [selectedSectionId, setSelectedSectionId] = useState<string | null>(null);
  const [selectedDrumKeyframeId, setSelectedDrumKeyframeId] = useState<string | null>(null);
  const [selectedChordKeyframeId, setSelectedChordKeyframeId] = useState<string | null>(null);
  const [expandedLayers, setExpandedLayers] = useState<Record<LayerName, boolean>>({
    drums: false,
    chords: false,
    ambient: false,
  });

  const toggleLayerExpand = (layer: LayerName) => {
    setExpandedLayers((prev) => ({ ...prev, [layer]: !prev[layer] }));
  };

  const handleRulerClick = useCallback(
    (e: React.MouseEvent<HTMLDivElement>) => {
      const rect = e.currentTarget.getBoundingClientRect();
      const x = e.clientX - rect.left - 80;
      const totalBeats = x / (pixelsPerBar / 4);
      const bar = Math.floor(totalBeats / 4);
      const beat = Math.floor(totalBeats % 4);

      if (bar >= 0 && bar < state.durationBars) {
        onSeek(bar, beat);
      }
    },
    [pixelsPerBar, state.durationBars, onSeek]
  );

  const totalHeight =
    24 + 20 + 32 + 32 + 32 +
    (expandedLayers.drums ? 48 : 0) +
    (expandedLayers.chords ? 48 : 0) +
    (expandedLayers.ambient ? 48 : 0) +
    24 + 24 + 24;

  return (
    <div className={cn('flex flex-col bg-card/30 rounded-lg border border-border/50', className)}>
      <div className="flex items-center justify-between p-2 border-b border-border/50">
        <TimeDisplay
          bar={state.playheadBar}
          beat={state.playheadBeat}
          durationBars={state.durationBars}
          bpm={bpm}
        />
        <DurationSelector value={state.durationBars} onChange={onDurationChange} />
      </div>

      <div ref={containerRef} className="relative overflow-x-auto overflow-y-visible">
        <div className="relative" style={{ minWidth: state.durationBars * pixelsPerBar + 80 }}>
          <div className="ml-20 cursor-pointer" onClick={handleRulerClick}>
            <TimelineRuler durationBars={state.durationBars} pixelsPerBar={pixelsPerBar} />
          </div>

          <div className="ml-20">
            <LoopBracket
              region={state.loopRegion}
              durationBars={state.durationBars}
              pixelsPerBar={pixelsPerBar}
              onChange={(r) => onLoopRegionChange(r.start, r.end, r.enabled)}
            />
          </div>

          <SectionTrack
            sections={state.sections}
            durationBars={state.durationBars}
            pixelsPerBar={pixelsPerBar}
            selectedId={selectedSectionId}
            onSelect={setSelectedSectionId}
            onAdd={onSectionAdd}
            onResize={onSectionResize}
            onMove={onSectionMove}
            onDelete={onSectionDelete}
          />

          <KeyframeTrack<PatternKeyframe>
            label="Drums"
            icon={<Drum className="h-3 w-3" />}
            keyframes={state.drumKeyframes}
            durationBars={state.durationBars}
            pixelsPerBar={pixelsPerBar}
            selectedId={selectedDrumKeyframeId}
            onSelect={setSelectedDrumKeyframeId}
            onAdd={(bar) => onDrumKeyframeAdd(bar, 0)}
            onDelete={onDrumKeyframeDelete}
            markerColor="bg-lofi-orange"
            renderPicker={({ keyframe, onClose }) => (
              <PatternPicker
                selectedIndex={keyframe.patternIndex}
                onSelect={(idx) => onDrumKeyframeUpdate(keyframe.id, idx)}
                onRandom={() => onDrumKeyframeUpdate(keyframe.id, Math.floor(Math.random() * 5))}
                onClose={onClose}
              />
            )}
          />

          <div className="flex items-center h-5 px-2 ml-20 bg-muted/5">
            <Toggle
              pressed={expandedLayers.drums}
              onPressedChange={() => toggleLayerExpand('drums')}
              size="sm"
              className="h-4 px-1 text-[9px]"
            >
              {expandedLayers.drums ? 'Hide' : 'Auto'}
            </Toggle>
          </div>

          {expandedLayers.drums && (
            <AutomationLane
              label="Vol"
              icon={<Volume2 className="h-3 w-3" />}
              points={state.volumeAutomation.drums}
              durationBars={state.durationBars}
              pixelsPerBar={pixelsPerBar}
              onAddPoint={(bar, beat, value) => onAutomationPointAdd('drums', bar, beat, value)}
              onUpdatePoint={(id, bar, beat, value) =>
                onAutomationPointUpdate('drums', id, bar, beat, value)
              }
              onDeletePoint={(id) => onAutomationPointDelete('drums', id)}
            />
          )}

          <KeyframeTrack<ChordKeyframe>
            label="Chords"
            icon={<Music className="h-3 w-3" />}
            keyframes={state.chordKeyframes}
            durationBars={state.durationBars}
            pixelsPerBar={pixelsPerBar}
            selectedId={selectedChordKeyframeId}
            onSelect={setSelectedChordKeyframeId}
            onAdd={(bar) => onChordKeyframeAdd(bar, 0)}
            onDelete={onChordKeyframeDelete}
            markerColor="bg-lofi-pink"
            renderPicker={({ keyframe, onClose }) => (
              <ProgressionPicker
                selectedIndex={keyframe.progressionIndex}
                onSelect={(idx) => onChordKeyframeUpdate(keyframe.id, idx)}
                onRandom={() => onChordKeyframeUpdate(keyframe.id, Math.floor(Math.random() * 5))}
                onClose={onClose}
              />
            )}
          />

          <div className="flex items-center h-5 px-2 ml-20 bg-muted/5">
            <Toggle
              pressed={expandedLayers.chords}
              onPressedChange={() => toggleLayerExpand('chords')}
              size="sm"
              className="h-4 px-1 text-[9px]"
            >
              {expandedLayers.chords ? 'Hide' : 'Auto'}
            </Toggle>
          </div>

          {expandedLayers.chords && (
            <AutomationLane
              label="Vol"
              icon={<Volume2 className="h-3 w-3" />}
              points={state.volumeAutomation.chords}
              durationBars={state.durationBars}
              pixelsPerBar={pixelsPerBar}
              onAddPoint={(bar, beat, value) => onAutomationPointAdd('chords', bar, beat, value)}
              onUpdatePoint={(id, bar, beat, value) =>
                onAutomationPointUpdate('chords', id, bar, beat, value)
              }
              onDeletePoint={(id) => onAutomationPointDelete('chords', id)}
            />
          )}

          <MuteTrack
            label="Ambient"
            icon={<Cloud className="h-3 w-3" />}
            keyframes={state.muteKeyframes.ambient}
            durationBars={state.durationBars}
            pixelsPerBar={pixelsPerBar}
            onToggle={(bar) => onMuteKeyframeToggle('ambient', bar)}
          />

          <div className="flex items-center h-5 px-2 ml-20 bg-muted/5">
            <Toggle
              pressed={expandedLayers.ambient}
              onPressedChange={() => toggleLayerExpand('ambient')}
              size="sm"
              className="h-4 px-1 text-[9px]"
            >
              {expandedLayers.ambient ? 'Hide' : 'Auto'}
            </Toggle>
          </div>

          {expandedLayers.ambient && (
            <AutomationLane
              label="Vol"
              icon={<Volume2 className="h-3 w-3" />}
              points={state.volumeAutomation.ambient}
              durationBars={state.durationBars}
              pixelsPerBar={pixelsPerBar}
              onAddPoint={(bar, beat, value) => onAutomationPointAdd('ambient', bar, beat, value)}
              onUpdatePoint={(id, bar, beat, value) =>
                onAutomationPointUpdate('ambient', id, bar, beat, value)
              }
              onDeletePoint={(id) => onAutomationPointDelete('ambient', id)}
            />
          )}

          <Playhead
            bar={state.playheadBar}
            beat={state.playheadBeat}
            pixelsPerBar={pixelsPerBar}
            height={totalHeight}
            durationBars={state.durationBars}
            onSeek={onSeek}
            className="ml-20"
          />
        </div>
      </div>
    </div>
  );
}