import { ThemedText } from '@/components/themed-text';
import { VideoView, useVideoPlayer } from 'expo-video';
import React, { useCallback, useEffect, useMemo, useRef, useState } from 'react';
import {
  ActivityIndicator,
  Dimensions,
  Modal,
  PanResponder,
  Platform,
  StatusBar,
  StyleSheet,
  TouchableOpacity,
  View,
  BackHandler,
} from 'react-native';

const { width: screenWidth, height: screenHeight } = Dimensions.get('window');

export interface FullscreenVideoModalProps {
  visible: boolean;
  onClose: () => void;
  videoUrl: string;
  poster?: string;
  autoPlay?: boolean;
  isLooping?: boolean;
  isMuted?: boolean;
  onPrevious?: () => void;
  onNext?: () => void;
  hasNext?: boolean;
  hasPrevious?: boolean;
}

export function FullscreenVideoModal({
  visible,
  onClose,
  videoUrl,
  poster,
  autoPlay = true,
  isLooping = true,
  isMuted = false,
  onPrevious,
  onNext,
  hasNext = false,
  hasPrevious = false,
}: FullscreenVideoModalProps) {
  // 使用useRef存储player实例，避免无限循环
  const playerRef = useRef<any>(null);

  // 稳定videoUrl，使用useMemo
  const stableVideoUrl = useMemo(() => ({ uri: videoUrl }), [videoUrl]);

  // 始终调用useVideoPlayer，但只在videoUrl变化时更新player
  const newPlayer = useVideoPlayer(
    stableVideoUrl,
    (player) => {
      player.loop = isLooping;
      player.muted = isMuted;
      if (autoPlay) {
        player.play();
      }
    }
  );

  // 只有当newPlayer变化时才更新player
  useEffect(() => {
    playerRef.current = newPlayer;
  }, [newPlayer]);

  // 获取当前的player实例
  const player = playerRef.current || newPlayer;

  const [isLoading, setIsLoading] = useState(true);

  // 重置状态当模态框打开/关闭时
  useEffect(() => {
    if (visible) {
      setIsLoading(true);
    } else {
      const currentPlayer = playerRef.current;
      if (currentPlayer) {
        currentPlayer.pause();
      }
    }
  }, [visible, autoPlay]);

  // 处理视频加载完成
  const handleVideoReady = () => {
    setIsLoading(false);
    if (autoPlay) {
      const currentPlayer = playerRef.current;
      currentPlayer?.play();
    }
  };

  // 处理视频错误
  const handleVideoError = (error: any) => {
    console.error('视频播放错误:', error);
    setIsLoading(false);
  };

  const handleClose = useCallback(() => {
    onClose();
  }, [onClose]);

  // 视频点击处理（直接关闭）
  const handleVideoPress = () => {
    handleClose();
  };

  // 创建手势处理器
  const panResponder = React.useRef(
    PanResponder.create({
      onMoveShouldSetPanResponder: (_, gestureState) => {
        return Math.abs(gestureState.dx) > Math.abs(gestureState.dy) && Math.abs(gestureState.dx) > 10;
      },
      onPanResponderRelease: (_, gestureState) => {
        const threshold = screenWidth / 4;
        if (gestureState.dx > threshold && hasPrevious) {
          onPrevious?.();
        } else if (gestureState.dx < -threshold && hasNext) {
          onNext?.();
        }
      },
    })
  ).current;

  // 处理返回键（Android）
  useEffect(() => {
    const handleBackPress = () => {
      if (visible) {
        onClose();
        return true;
      }
      return false;
    };

    const subscription = BackHandler.addEventListener('hardwareBackPress', handleBackPress);
    return () => subscription.remove();
  }, [visible, onClose]);

  if (!visible) return null;

  return (
    <Modal
      visible={visible}
      transparent={false}
      animationType="fade"
      onRequestClose={handleClose}
      statusBarTranslucent={true}
    >
      <View style={styles.container}>
        {Platform.OS === 'android' && <StatusBar hidden />}

        <TouchableOpacity
          style={styles.videoContainer}
          onPress={handleVideoPress}
          activeOpacity={1}
        >
          <View
            style={styles.videoWrapper}
            {...panResponder.panHandlers}
          >
            {Platform.OS === 'web' ? (
              <video
                src={videoUrl}
                style={styles.video}
                autoPlay={autoPlay}
                loop={isLooping}
                muted={isMuted}
                playsInline
                onLoadedData={() => setIsLoading(false)}
                onError={handleVideoError}
              />
            ) : (
              <VideoView
                player={player}
                style={styles.video}
                contentFit="contain"
                nativeControls={false}
              />
            )}

            {isLoading && (
              <View style={styles.loadingOverlay}>
                <ActivityIndicator size="large" color="#4ECDC4" />
              </View>
            )}

            {hasPrevious && (
              <TouchableOpacity
                style={styles.leftIndicator}
                onPress={(e) => {
                  e.stopPropagation();
                  onPrevious?.();
                }}
                activeOpacity={0.7}
              >
                <ThemedText style={styles.indicatorIcon}>‹</ThemedText>
              </TouchableOpacity>
            )}
            {hasNext && (
              <TouchableOpacity
                style={styles.rightIndicator}
                onPress={(e) => {
                  e.stopPropagation();
                  onNext?.();
                }}
                activeOpacity={0.7}
              >
                <ThemedText style={styles.indicatorIcon}>›</ThemedText>
              </TouchableOpacity>
            )}
          </View>
        </TouchableOpacity>
      </View>
    </Modal>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#000',
  },
  videoContainer: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
  videoWrapper: {
    flex: 1,
    width: '100%',
    height: '100%',
    justifyContent: 'center',
    alignItems: 'center',
  },
  video: {
    width: screenWidth,
    height: screenHeight,
    backgroundColor: '#000',
  },
  loadingOverlay: {
    position: 'absolute',
    top: 0,
    left: 0,
    right: 0,
    bottom: 0,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: 'rgba(0, 0, 0, 0.3)',
  },
  leftIndicator: {
    position: 'absolute',
    left: 20,
    top: '50%',
    marginTop: -20,
    width: 40,
    height: 40,
    borderRadius: 20,
    backgroundColor: 'rgba(0, 0, 0, 0.5)',
    justifyContent: 'center',
    alignItems: 'center',
    zIndex: 10,
  },
  rightIndicator: {
    position: 'absolute',
    right: 20,
    top: '50%',
    marginTop: -20,
    width: 40,
    height: 40,
    borderRadius: 20,
    backgroundColor: 'rgba(0, 0, 0, 0.5)',
    justifyContent: 'center',
    alignItems: 'center',
    zIndex: 10,
  },
  indicatorIcon: {
    fontSize: 24,
    color: '#fff',
    fontWeight: 'bold',
  },
});

export default FullscreenVideoModal;