import { useRef, useEffect, useState, useCallback, useMemo, forwardRef, useImperativeHandle } from 'react';
import Hls from 'hls.js';
import { detectStreamType } from '../utils/streamUtils';
import { useOilDetection } from '../hooks/useOilDetection';
import OilDetectionOverlay from './OilDetectionOverlay';

interface CCTVPlayerProps {
  cameraNm: string;
  streamUrl: string | null;
  sttsCd: string;
  coordDc?: string | null;
  sourceNm?: string | null;
  cellIndex?: number;
  oilDetectionEnabled?: boolean;
  vesselDetectionEnabled?: boolean;
  intrusionDetectionEnabled?: boolean;
}

export interface CCTVPlayerHandle {
  capture: () => void;
}

type PlayerState = 'loading' | 'playing' | 'error' | 'offline' | 'no-url';

/** 외부 HLS URL을 백엔드 프록시 경유 URL로 변환 */
function toProxyUrl(url: string): string {
  if (url.startsWith('http://') || url.startsWith('https://')) {
    return `/api/aerial/cctv/stream-proxy?url=${encodeURIComponent(url)}`;
  }
  return url;
}

export const CCTVPlayer = forwardRef<CCTVPlayerHandle, CCTVPlayerProps>(({
  cameraNm,
  streamUrl,
  sttsCd,
  coordDc,
  sourceNm,
  cellIndex = 0,
  oilDetectionEnabled = false,
  vesselDetectionEnabled = false,
  intrusionDetectionEnabled = false,
}, ref) => {
  const videoRef = useRef<HTMLVideoElement>(null);
  const containerRef = useRef<HTMLDivElement>(null);
  const hlsRef = useRef<Hls | null>(null);
  const [hlsPlayerState, setHlsPlayerState] = useState<'loading' | 'playing' | 'error'>('loading');
  const [retryKey, setRetryKey] = useState(0);

  /** 원본 URL 기반으로 타입 감지, 재생은 프록시 URL 사용 */
  const proxiedUrl = useMemo(
    () => (streamUrl ? toProxyUrl(streamUrl) : null),
    [streamUrl],
  );

  /** props 기반으로 상태를 동기적으로 파생 */
  const isOffline = sttsCd === 'OFFLINE' || sttsCd === 'MAINT';
  const hasNoUrl = !isOffline && (!streamUrl || !proxiedUrl);
  const streamType = useMemo(
    () => (streamUrl && !isOffline ? detectStreamType(streamUrl) : null),
    [streamUrl, isOffline],
  );

  const playerState: PlayerState = isOffline
    ? 'offline'
    : hasNoUrl
      ? 'no-url'
      : (streamType === 'mjpeg' || streamType === 'iframe')
        ? 'playing'
        : hlsPlayerState;

  const { result: oilResult, isAnalyzing: oilAnalyzing, error: oilError } = useOilDetection({
    videoRef,
    enabled: oilDetectionEnabled && playerState === 'playing' && (streamType === 'hls' || streamType === 'mp4'),
  });

  useImperativeHandle(ref, () => ({
    capture: () => {
      const container = containerRef.current;
      if (!container) return;

      const w = container.clientWidth;
      const h = container.clientHeight;
      const canvas = document.createElement('canvas');
      canvas.width = w * 2;
      canvas.height = h * 2;
      const ctx = canvas.getContext('2d');
      if (!ctx) return;
      ctx.scale(2, 2);

      // 1) video frame
      const video = videoRef.current;
      if (video && video.readyState >= 2) {
        ctx.drawImage(video, 0, 0, w, h);
      }

      // 2) oil detection overlay
      const overlayCanvas = container.querySelector<HTMLCanvasElement>('canvas');
      if (overlayCanvas) {
        ctx.drawImage(overlayCanvas, 0, 0, w, h);
      }

      // 3) OSD: camera name + timestamp
      ctx.fillStyle = 'rgba(0,0,0,0.7)';
      ctx.fillRect(8, 8, ctx.measureText(cameraNm).width + 20, 22);
      ctx.font = 'bold 12px sans-serif';
      ctx.fillStyle = '#ffffff';
      ctx.fillText(cameraNm, 18, 23);

      const ts = new Date().toLocaleString('ko-KR');
      ctx.font = '10px monospace';
      ctx.fillStyle = 'rgba(0,0,0,0.7)';
      const tsW = ctx.measureText(ts).width + 16;
      ctx.fillRect(8, h - 26, tsW, 20);
      ctx.fillStyle = '#a0aec0';
      ctx.fillText(ts, 16, h - 12);

      // 4) oil detection info
      if (oilResult && oilResult.regions.length > 0) {
        const areaText = oilResult.totalAreaM2 >= 1000
          ? `오일 감지: ${(oilResult.totalAreaM2 / 1_000_000).toFixed(1)} km² (${oilResult.totalPercentage.toFixed(1)}%)`
          : `오일 감지: ~${Math.round(oilResult.totalAreaM2)} m² (${oilResult.totalPercentage.toFixed(1)}%)`;
        ctx.font = 'bold 11px sans-serif';
        const atW = ctx.measureText(areaText).width + 16;
        ctx.fillStyle = 'rgba(239,68,68,0.25)';
        ctx.fillRect(8, h - 48, atW, 18);
        ctx.fillStyle = '#f87171';
        ctx.fillText(areaText, 16, h - 34);
      }

      // download
      const link = document.createElement('a');
      link.download = `CCTV_${cameraNm}_${new Date().toISOString().slice(0, 19).replace(/:/g, '')}.png`;
      link.href = canvas.toDataURL('image/png');
      link.click();
    },
  }), [cameraNm, oilResult]);

  const destroyHls = useCallback(() => {
    if (hlsRef.current) {
      hlsRef.current.destroy();
      hlsRef.current = null;
    }
  }, []);

  useEffect(() => {
    if (isOffline || hasNoUrl || !streamUrl || !proxiedUrl) {
      destroyHls();
      return;
    }

    const type = detectStreamType(streamUrl);
    queueMicrotask(() => setHlsPlayerState('loading'));

    if (type === 'hls') {
      const video = videoRef.current;
      if (!video) return;

      if (Hls.isSupported()) {
        destroyHls();
        const hls = new Hls({
          enableWorker: true,
          lowLatencyMode: true,
          maxBufferLength: 10,
          maxMaxBufferLength: 30,
        });
        hlsRef.current = hls;
        hls.loadSource(proxiedUrl);
        hls.attachMedia(video);
        hls.on(Hls.Events.MANIFEST_PARSED, () => {
          setHlsPlayerState('playing');
          video.play().catch(() => {});
        });
        hls.on(Hls.Events.ERROR, (_event, data) => {
          if (data.fatal) {
            setHlsPlayerState('error');
            if (data.type === Hls.ErrorTypes.NETWORK_ERROR) {
              setTimeout(() => hls.startLoad(), 3000);
            }
          }
        });
        return () => destroyHls();
      }

      // Safari 네이티브 HLS (프록시 경유)
      if (video.canPlayType('application/vnd.apple.mpegurl')) {
        video.src = proxiedUrl;
        const onLoaded = () => setHlsPlayerState('playing');
        const onError = () => setHlsPlayerState('error');
        video.addEventListener('loadeddata', onLoaded);
        video.addEventListener('error', onError);
        video.play().catch(() => {});
        return () => {
          video.removeEventListener('loadeddata', onLoaded);
          video.removeEventListener('error', onError);
        };
      }

      queueMicrotask(() => setHlsPlayerState('error'));
      return;
    }

    if (type === 'mp4') {
      const video = videoRef.current;
      if (!video) return;
      video.src = proxiedUrl;
      const onLoaded = () => setHlsPlayerState('playing');
      const onError = () => setHlsPlayerState('error');
      video.addEventListener('loadeddata', onLoaded);
      video.addEventListener('error', onError);
      video.play().catch(() => {});
      return () => {
        video.removeEventListener('loadeddata', onLoaded);
        video.removeEventListener('error', onError);
      };
    }

    if (type === 'mjpeg' || type === 'iframe') {
      return;
    }

    queueMicrotask(() => setHlsPlayerState('error'));
    return () => destroyHls();
  }, [streamUrl, proxiedUrl, isOffline, hasNoUrl, destroyHls, retryKey]);

  // 오프라인
  if (playerState === 'offline') {
    return (
      <div className="absolute inset-0 flex flex-col items-center justify-center bg-[#0a0e18]">
        <div className="text-2xl opacity-30 mb-2">📹</div>
        <div className="text-[11px] font-korean text-text-3 opacity-70">
          {sttsCd === 'MAINT' ? '점검중' : '오프라인'}
        </div>
        <div className="text-[9px] font-korean text-text-3 opacity-40 mt-1">{cameraNm}</div>
      </div>
    );
  }

  // URL 미설정
  if (playerState === 'no-url') {
    return (
      <div className="absolute inset-0 flex flex-col items-center justify-center bg-[#0a0e18]">
        <div className="text-2xl opacity-20 mb-2">📹</div>
        <div className="text-[10px] font-korean text-text-3 opacity-50">스트림 URL 미설정</div>
        <div className="text-[9px] font-korean text-text-3 opacity-30 mt-1">{cameraNm}</div>
      </div>
    );
  }

  // 에러
  if (playerState === 'error') {
    return (
      <div className="absolute inset-0 flex flex-col items-center justify-center bg-[#0a0e18]">
        <div className="text-2xl opacity-30 mb-2">⚠️</div>
        <div className="text-[10px] font-korean text-status-red opacity-70">연결 실패</div>
        <div className="text-[9px] font-korean text-text-3 opacity-40 mt-1">{cameraNm}</div>
        <button
          onClick={() => setRetryKey(k => k + 1)}
          className="mt-2 px-2.5 py-1 rounded text-[9px] font-korean bg-bg-3 border border-border text-text-2 cursor-pointer hover:bg-bg-hover transition-colors"
        >
          재시도
        </button>
      </div>
    );
  }

  return (
    <div ref={containerRef} className="absolute inset-0">
      {/* 로딩 오버레이 */}
      {playerState === 'loading' && (
        <div className="absolute inset-0 flex flex-col items-center justify-center bg-[#0a0e18] z-10">
          <div className="text-lg opacity-40 animate-pulse mb-2">📹</div>
          <div className="text-[10px] font-korean text-text-3 opacity-50">연결 중...</div>
        </div>
      )}

      {/* HLS / MP4 */}
      {(streamType === 'hls' || streamType === 'mp4') && (
        <video
          ref={videoRef}
          key={`video-${cellIndex}-${retryKey}`}
          className="absolute inset-0 w-full h-full object-cover"
          muted
          autoPlay
          playsInline
          loop={streamType === 'mp4'}
        />
      )}

      {/* 오일 감지 오버레이 */}
      {oilDetectionEnabled && (
        <OilDetectionOverlay result={oilResult} isAnalyzing={oilAnalyzing} error={oilError} />
      )}

      {/* MJPEG */}
      {streamType === 'mjpeg' && proxiedUrl && (
        <img
          src={proxiedUrl}
          alt={cameraNm}
          className="absolute inset-0 w-full h-full object-cover"
          onError={() => setHlsPlayerState('error')}
        />
      )}

      {/* iframe (원본 URL 사용 — iframe은 자체 CORS) */}
      {streamType === 'iframe' && streamUrl && (
        <iframe
          src={streamUrl}
          title={cameraNm}
          className="absolute inset-0 w-full h-full border-none"
          allow="autoplay; encrypted-media"
          onError={() => setHlsPlayerState('error')}
        />
      )}

      {/* 안전관리 감지 상태 배지 */}
      {(vesselDetectionEnabled || intrusionDetectionEnabled) && (
        <div className="absolute top-2 right-2 flex flex-col gap-1 z-20">
          {vesselDetectionEnabled && (
            <div className="flex items-center gap-1 px-1.5 py-0.5 rounded text-[8px] font-bold"
              style={{ background: 'rgba(59,130,246,.3)', color: '#93c5fd' }}>
              🚢 선박 출입 감지 중
            </div>
          )}
          {intrusionDetectionEnabled && (
            <div className="flex items-center gap-1 px-1.5 py-0.5 rounded text-[8px] font-bold"
              style={{ background: 'rgba(249,115,22,.3)', color: '#fdba74' }}>
              🚨 침입 감지 중
            </div>
          )}
        </div>
      )}

      {/* OSD 오버레이 */}
      <div className="absolute top-2 left-2 flex items-center gap-1.5 z-20">
        <span className="text-[9px] font-bold px-1.5 py-0.5 rounded bg-black/70 text-white">
          {cameraNm}
        </span>
        {sttsCd === 'LIVE' && (
          <span
            className="text-[8px] font-bold px-1 py-0.5 rounded text-[#f87171]"
            style={{ background: 'rgba(239,68,68,.3)' }}
          >
            ● REC
          </span>
        )}
      </div>
      <div className="absolute bottom-2 left-2 text-[9px] font-mono px-1.5 py-0.5 rounded text-text-3 bg-black/70 z-20">
        {coordDc ?? ''}{sourceNm ? ` · ${sourceNm}` : ''}
      </div>
    </div>
  );
});

CCTVPlayer.displayName = 'CCTVPlayer';