'use client';

import { useRef, useState, useEffect, useCallback } from 'react';
import Hls from 'hls.js';
import { AnnotationCanvas, COLORS } from './AnnotationCanvas';
import { Timeline } from './Timeline';
import { AnnotationData, Comment } from '@/lib/api';

type Tool = 'pen' | 'arrow' | 'rect' | 'ellipse';

interface Props {
  src: string;
  mimeType: string;
  comments: Comment[];
  pendingAnnotation: AnnotationData | null;
  onAnnotationCreated: (annotation: AnnotationData) => void;
  onTimeUpdate: (time: number) => void;
  onCommentClick: (comment: Comment) => void;
}

export function VideoPlayer({
  src,
  mimeType,
  comments,
  pendingAnnotation,
  onAnnotationCreated,
  onTimeUpdate,
  onCommentClick,
}: Props) {
  const videoRef = useRef<HTMLVideoElement>(null);
  const containerRef = useRef<HTMLDivElement>(null);
  const [playing, setPlaying] = useState(false);
  const [currentTime, setCurrentTime] = useState(0);
  const [duration, setDuration] = useState(0);
  const [volume, setVolume] = useState(1);
  const [muted, setMuted] = useState(false);
  const [playbackRate, setPlaybackRate] = useState(1);
  const [fullscreen, setFullscreen] = useState(false);
  const [drawMode, setDrawMode] = useState(false);
  const [tool, setTool] = useState<Tool>('pen');
  const [color, setColor] = useState(COLORS[0].value);
  const [showControls, setShowControls] = useState(true);
  const [dims, setDims] = useState({ width: 0, height: 0 });

  const hideTimer = useRef<ReturnType<typeof setTimeout>>(undefined);

  // HLS setup
  useEffect(() => {
    const video = videoRef.current;
    if (!video || !src) return;

    if (mimeType === 'application/x-mpegURL' || src.endsWith('.m3u8')) {
      if (Hls.isSupported()) {
        const hls = new Hls();
        hls.loadSource(src);
        hls.attachMedia(video);
        return () => hls.destroy();
      }
    } else {
      video.src = src;
    }
  }, [src, mimeType]);

  // Measure container
  useEffect(() => {
    const obs = new ResizeObserver(entries => {
      for (const entry of entries) {
        setDims({ width: entry.contentRect.width, height: entry.contentRect.height });
      }
    });
    if (containerRef.current) obs.observe(containerRef.current);
    return () => obs.disconnect();
  }, []);

  // Keyboard shortcuts
  useEffect(() => {
    const handleKey = (e: KeyboardEvent) => {
      const video = videoRef.current;
      if (!video || e.target instanceof HTMLInputElement || e.target instanceof HTMLTextAreaElement) return;

      if (e.code === 'Space') { e.preventDefault(); video.paused ? video.play() : video.pause(); }
      if (e.code === 'ArrowLeft') { e.preventDefault(); video.currentTime = Math.max(0, video.currentTime - 5); }
      if (e.code === 'ArrowRight') { e.preventDefault(); video.currentTime = Math.min(duration, video.currentTime + 5); }
      if (e.code === 'KeyC') { e.preventDefault(); setDrawMode(v => !v); }
      if (e.code === 'KeyF') { e.preventDefault(); toggleFullscreen(); }
      if (e.code === 'KeyM') { e.preventDefault(); video.muted = !video.muted; }
      if (e.code === 'KeyU') { e.preventDefault(); stepFrame(-1); }
      if (e.code === 'KeyI') { e.preventDefault(); stepFrame(1); }
    };
    window.addEventListener('keydown', handleKey);
    return () => window.removeEventListener('keydown', handleKey);
  }, [duration]);

  // Auto-hide controls
  const resetHideTimer = useCallback(() => {
    setShowControls(true);
    clearTimeout(hideTimer.current);
    if (playing) {
      hideTimer.current = setTimeout(() => setShowControls(false), 3000);
    }
  }, [playing]);

  function stepFrame(dir: 1 | -1) {
    const video = videoRef.current;
    if (!video) return;
    // Approximate frame step: 1/fps (assume 30fps)
    const frameTime = 1 / 30;
    video.pause();
    video.currentTime = Math.max(0, Math.min(duration, video.currentTime + dir * frameTime));
  }

  function toggleFullscreen() {
    if (!containerRef.current) return;
    if (!document.fullscreenElement) {
      containerRef.current.requestFullscreen();
      setFullscreen(true);
    } else {
      document.exitFullscreen();
      setFullscreen(false);
    }
  }

  const togglePlay = () => {
    const video = videoRef.current;
    if (!video) return;
    video.paused ? video.play() : video.pause();
  };

  const handleVolume = (v: number) => {
    const video = videoRef.current;
    if (!video) return;
    video.volume = v;
    setVolume(v);
    setMuted(v === 0);
  };

  const handleSpeed = (rate: number) => {
    const video = videoRef.current;
    if (!video) return;
    video.playbackRate = rate;
    setPlaybackRate(rate);
  };

  const handleSeek = (time: number) => {
    const video = videoRef.current;
    if (!video) return;
    video.currentTime = time;
    setCurrentTime(time);
    onTimeUpdate(time);
  };

  // Annotations visible at current time (±0.5s)
  const visibleAnnotations = comments
    .filter(c => c.annotation && c.timestamp != null && Math.abs(c.timestamp - currentTime) < 0.5)
    .map(c => c.annotation as AnnotationData);

  return (
    <div
      ref={containerRef}
      className="relative bg-black rounded-xl overflow-hidden select-none group"
      onMouseMove={resetHideTimer}
      onMouseLeave={() => playing && setShowControls(false)}
    >
      {/* Video */}
      <video
        ref={videoRef}
        className="w-full block"
        onClick={togglePlay}
        onPlay={() => setPlaying(true)}
        onPause={() => setPlaying(false)}
        onTimeUpdate={() => {
          const t = videoRef.current?.currentTime ?? 0;
          setCurrentTime(t);
          onTimeUpdate(t);
        }}
        onLoadedMetadata={() => setDuration(videoRef.current?.duration ?? 0)}
        playsInline
      />

      {/* Annotation Canvas */}
      <AnnotationCanvas
        isDrawingMode={drawMode}
        tool={tool}
        color={color}
        annotations={[...visibleAnnotations, ...(pendingAnnotation ? [pendingAnnotation] : [])]}
        width={dims.width}
        height={dims.height}
        onAnnotationCreated={onAnnotationCreated}
      />

      {/* Big play button overlay */}
      {!playing && (
        <button
          className="absolute inset-0 flex items-center justify-center bg-black/30 z-20"
          onClick={togglePlay}
        >
          <div className="w-16 h-16 bg-white/90 rounded-full flex items-center justify-center shadow-2xl hover:scale-110 transition-transform">
            <svg className="w-8 h-8 text-gray-900 ml-1" fill="currentColor" viewBox="0 0 24 24">
              <path d="M8 5v14l11-7z" />
            </svg>
          </div>
        </button>
      )}

      {/* Controls overlay */}
      <div
        className={`absolute bottom-0 left-0 right-0 z-30 bg-gradient-to-t from-black/80 to-transparent pt-12 pb-3 px-4 transition-opacity duration-300 ${
          showControls || !playing ? 'opacity-100' : 'opacity-0 pointer-events-none'
        }`}
      >
        {/* Draw toolbar */}
        {drawMode && (
          <div className="flex items-center gap-2 mb-2">
            <span className="text-xs text-white/60 mr-1">Draw:</span>
            {(['pen', 'arrow', 'rect', 'ellipse'] as Tool[]).map(t => (
              <button
                key={t}
                onClick={() => setTool(t)}
                className={`px-2 py-1 rounded text-xs font-medium transition-colors ${
                  tool === t ? 'bg-blue-600 text-white' : 'bg-white/20 text-white hover:bg-white/30'
                }`}
              >
                {t.charAt(0).toUpperCase() + t.slice(1)}
              </button>
            ))}
            <div className="w-px h-5 bg-white/30 mx-1" />
            {COLORS.map(c => (
              <button
                key={c.value}
                className={`w-5 h-5 rounded-full border-2 transition-transform hover:scale-125 ${
                  color === c.value ? 'border-white scale-125' : 'border-transparent'
                }`}
                style={{ backgroundColor: c.value }}
                onClick={() => setColor(c.value)}
                title={c.name}
              />
            ))}
            <button
              onClick={() => setDrawMode(false)}
              className="ml-2 text-xs text-white/60 hover:text-white"
            >
              Done
            </button>
          </div>
        )}

        {/* Timeline */}
        <Timeline
          duration={duration}
          currentTime={currentTime}
          comments={comments}
          onSeek={handleSeek}
          onCommentClick={onCommentClick}
        />

        {/* Bottom controls */}
        <div className="flex items-center gap-2 mt-1">
          {/* Play/Pause */}
          <button onClick={togglePlay} className="text-white hover:text-blue-300 transition-colors">
            {playing ? (
              <svg className="w-5 h-5" fill="currentColor" viewBox="0 0 24 24">
                <path d="M6 4h4v16H6zM14 4h4v16h-4z" />
              </svg>
            ) : (
              <svg className="w-5 h-5" fill="currentColor" viewBox="0 0 24 24">
                <path d="M8 5v14l11-7z" />
              </svg>
            )}
          </button>

          {/* Frame step */}
          <button onClick={() => stepFrame(-1)} className="text-white/60 hover:text-white text-xs" title="Previous frame (U)">⏮</button>
          <button onClick={() => stepFrame(1)} className="text-white/60 hover:text-white text-xs" title="Next frame (I)">⏭</button>

          {/* Volume */}
          <button onClick={() => handleVolume(muted || volume === 0 ? 1 : 0)} className="text-white/80 hover:text-white">
            {muted || volume === 0 ? (
              <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5.586 15H4a1 1 0 01-1-1v-4a1 1 0 011-1h1.586l4.707-4.707A1 1 0 0112 5v14a1 1 0 01-1.707.707L5.586 15z" />
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M17 14l2-2m0 0l2-2m-2 2l-2-2m2 2l2 2" />
              </svg>
            ) : (
              <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15.536 8.464a5 5 0 010 7.072M5.586 15H4a1 1 0 01-1-1v-4a1 1 0 011-1h1.586l4.707-4.707A1 1 0 0112 5v14a1 1 0 01-1.707.707L5.586 15z" />
              </svg>
            )}
          </button>
          <input
            type="range"
            min={0}
            max={1}
            step={0.05}
            value={muted ? 0 : volume}
            onChange={e => handleVolume(parseFloat(e.target.value))}
            className="w-16 h-1 accent-blue-500"
          />

          <span className="text-xs text-white/60 ml-1">
            {formatTime(currentTime)} / {formatTime(duration)}
          </span>

          <div className="flex-1" />

          {/* Speed */}
          <select
            value={playbackRate}
            onChange={e => handleSpeed(parseFloat(e.target.value))}
            className="bg-transparent text-xs text-white/80 border border-white/30 rounded px-1.5 py-0.5 cursor-pointer hover:border-white/60"
          >
            {[0.25, 0.5, 0.75, 1, 1.25, 1.5, 2].map(r => (
              <option key={r} value={r} className="text-black">{r}x</option>
            ))}
          </select>

          {/* Draw mode */}
          <button
            onClick={() => setDrawMode(v => !v)}
            className={`px-2 py-1 rounded text-xs font-medium transition-colors ${
              drawMode ? 'bg-blue-600 text-white' : 'bg-white/20 text-white hover:bg-white/30'
            }`}
            title="Toggle draw mode (C)"
          >
            <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15.232 5.232l3.536 3.536m-2.036-5.036a2.5 2.5 0 113.536 3.536L6.5 21.036H3v-3.572L16.732 3.732z" />
            </svg>
          </button>

          {/* Fullscreen */}
          <button onClick={toggleFullscreen} className="text-white/80 hover:text-white" title="Fullscreen (F)">
            <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
              {fullscreen ? (
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 9V4.5M9 9H4.5M9 9L3.75 3.75M9 15v4.5M9 15H4.5M9 15l-5.25 5.25M15 9h4.5M15 9V4.5M15 9l5.25-5.25M15 15h4.5M15 15v4.5m0-4.5l5.25 5.25" />
              ) : (
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3.75 3.75v4.5m0-4.5h4.5m-4.5 0L9 9M3.75 20.25v-4.5m0 4.5h4.5m-4.5 0L9 15M20.25 3.75h-4.5m4.5 0v4.5m0-4.5L15 9m5.25 11.25h-4.5m4.5 0v-4.5m0 4.5L15 15" />
              )}
            </svg>
          </button>
        </div>
      </div>
    </div>
  );
}

function formatTime(s: number): string {
  if (!s || isNaN(s)) return '0:00';
  const m = Math.floor(s / 60);
  const sec = Math.floor(s % 60);
  return `${m}:${sec.toString().padStart(2, '0')}`;
}