import { Audio } from 'expo-av';
import { Image } from 'expo-image';
import { Stack, useLocalSearchParams, useRouter } from 'expo-router';
import React, { useEffect, useRef, useState } from 'react';
import { Dimensions, StyleSheet, Text, TouchableOpacity, View } from 'react-native';
import { useSafeAreaInsets } from 'react-native-safe-area-context';

import LotteryGrid from './components/LotteryGrid';
import LotteryReel from './components/LotteryReel';

import { Images } from '@/constants/images';
import services from '@/services/api';

const { width: SCREEN_WIDTH } = Dimensions.get('window');

// Sound URL from Uniapp config
const SOUND_URL = 'https://cdn.acetoys.cn/kai_xin_ma_te/resource/magic/lottery.mp3';

export default function LotteryScreen() {
  const router = useRouter();
  const params = useLocalSearchParams();
  const insets = useSafeAreaInsets();
  
  const num = Number(params.num) || 1;
  const isGrid = num >= 10;

  const tradeNo = params.tradeNo as string;
  const poolId = params.poolId as string;

  const [results, setResults] = useState<any[]>([]);
  const [pool, setPool] = useState<any[]>([]);
  const [loading, setLoading] = useState(true);
  const [sound, setSound] = useState<Audio.Sound>();
  const [animationFinished, setAnimationFinished] = useState(false);
  
  // Timer Ref for cleanup
  const timerRef = useRef<any>(null);

  // Layout calculations
  const itemWidth = (num === 1) ? 94 : 72; // Adjusted to 72 to match mask calculation exactly (was 71)
  // Uniapp width logic:
  // width() { return (screenWidth - (this.num == 1 ? 94 : 72)) / 2 }
  const maskWidth = (SCREEN_WIDTH - ((num === 1) ? 94 : 72)) / 2; 
  const padding = SCREEN_WIDTH > 375 ? 32 : 0; 

  useEffect(() => {
    init();
    return () => {
      sound?.unloadAsync();
      if (timerRef.current) clearTimeout(timerRef.current);
    };
  }, []);

  const init = async () => {
      try {
          console.log('LotteryScreen Init: num', num, 'tradeNo', tradeNo, 'poolId', poolId);
          await Promise.all([loadData() /*, playSound()*/]);
      } catch (e) {
          console.error('LotteryScreen Init Error', e);
      } finally {
          setLoading(false);
      }
  }

  const playSound = async () => {
    try {
      const { sound } = await Audio.Sound.createAsync(
        { uri: SOUND_URL }
      );
      setSound(sound);
      await sound.playAsync();
    } catch (error) {
       console.log('Error playing sound', error);
    }
  };

  const loadData = async () => {
      if (tradeNo) {
         try {
             const res: any = await services.award.getApplyResult(tradeNo);
             const list = res?.data?.inventoryList || res?.inventoryList || [];
             setResults(list);
             
             // 2. Fetch Pool (Goods) if not passed
             if (poolId && !isGrid) {
                 const detailRes = await services.award.getPoolDetail(poolId);
                 const goods = detailRes?.luckGoodsList || [];
                 setPool(goods);
             } else if (!isGrid) {
                 setPool(list);
             }
    
             // Auto show result after animation
             if (timerRef.current) clearTimeout(timerRef.current);
             
             if (!isGrid) {
                // Reel mode uses timer
                timerRef.current = setTimeout(() => {
                    handleFinish(list);
                }, 2800); 
             }
             // Grid mode handles finish via callback
         } catch (error) {
             console.error('Load Data Error', error);
             // Safety fallback?
         }
      }
  };

  const handleFinish = (finalResults?: any[]) => {
    if (timerRef.current) {
        clearTimeout(timerRef.current);
        timerRef.current = null;
    }
    
    if (isGrid) {
        // Stop sound and mark finished, stay on page
        sound?.stopAsync();
        setAnimationFinished(true);
        return;
    }

    // Navigate to result modal/screen
    const data = finalResults || results;
    // We can navigate to a result page or show a local modal components
    // Assuming we have a result route
    router.replace({ 
        pathname: '/lottery/result' as any, 
        params: { 
            results: JSON.stringify(data),
            poolId
        } 
    });
  };
  
  const handleSkip = () => {
      if (isGrid) {
          if (animationFinished) {
              // User clicked "Claim Prize", exit
              router.back(); 
          } else {
              // User clicked "Skip Animation", finish immediately
              // Ideally LotteryGrid should expose a "finish" method or we force state
              // But for now calling handleFinish stops navigation
              handleFinish();
              // Note: This doesn't force cards to flip instantly unless we implement that prop in LotteryGrid
          }
      } else {
          sound?.stopAsync();
          handleFinish();
      }
  };

  if (loading) return (
      <View style={styles.container}>
          <Image source={{ uri: Images.mine.kaixinMineBg }} style={styles.bg} contentFit="cover" />
      </View>
  );

  return (
    <View style={styles.container}>
      <Stack.Screen options={{ headerShown: false }} />
      <Image source={{ uri: Images.mine.kaixinMineBg }} style={styles.bg} contentFit="cover" />
      <View style={styles.maskPage} />

      <View style={[styles.wrapper, { paddingTop: padding }]}>
         {isGrid ? (
             <LotteryGrid 
                results={results} 
                onFinish={() => handleFinish()} 
             />
         ) : (
             <View style={styles.reelsContainer}>
                {/* Left Column Masks */}
                <View style={[styles.maskLeft, { width: maskWidth }]} />
                
                {/* Reels */}
                <View style={num === 1 ? styles.height1 : styles.height5}>
                    {results.map((item, index) => (
                        <View key={index} style={styles.reelRow}> 
                            <LotteryReel 
                                key={`reel-${index}-${pool.length}-${results.length}`} 
                                pool={pool.length > 0 ? pool : results} 
                                result={item}
                                width={SCREEN_WIDTH} 
                                itemWidth={itemWidth}
                                index={index}
                                delay={index * 30} // Very fast stagger
                                duration={2000} // Faster spin (was 3000)
                            />
                        </View>
                    ))}
                </View>

                {/* Right Column Masks */}
                <View style={[styles.maskRight, { width: maskWidth }]} />
                
                {/* Middle Frame */}
                <Image 
                    source={{ uri: num === 1 ? Images.resource.lottery_middle_s : Images.resource.lottery_middle_l }}
                    style={[
                        styles.middleImage, 
                        { 
                            height: num === 1 ? 200 : 540, 
                            top: num === 1 ? -35 : -10,
                        }
                    ]}
                    contentFit="contain"
                />
             </View>
         )}
      </View>

      <View style={styles.bottom}>
        <TouchableOpacity 
            style={styles.skipBtn} 
            onPress={handleSkip}
        >
            <Text style={styles.skipText}>
                {isGrid && animationFinished ? '收下奖品' : '跳过动画'}
            </Text>
        </TouchableOpacity>
      </View>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#222335',
  },
  bg: {
    position: 'absolute',
    width: '100%',
    height: '100%',
    zIndex: -1,
  },
  maskPage: {
    ...StyleSheet.absoluteFillObject,
    backgroundColor: 'rgba(0,0,0,0.4)',
    zIndex: 0,
  },
  wrapper: {
    flex: 1,
    // justifyContent: 'center', 
    alignItems: 'center',
    marginTop: 100, // Adjust based on visual
  },
  reelsContainer: {
    position: 'relative',
    alignItems: 'center',
    justifyContent: 'center',
    // backgroundColor: 'rgba(255,0,0,0.1)', // Debug
  },
  reelRow: {
      overflow: 'hidden',
      width: SCREEN_WIDTH,
      alignItems: 'center',
      justifyContent: 'center',
      marginBottom: 12, // Gap between rows
      height: 94, // Height of one row (card height + tiny padding)
  },
  height1: {
      height: 130, // 1 row + gaps
      justifyContent: 'center',
  },
  height5: {
      height: 540, // 5 rows * (~100)
      justifyContent: 'center',
      paddingVertical: 10,
  },
  maskLeft: {
    position: 'absolute',
    left: 0,
    top: 0,
    bottom: 0,
    backgroundColor: 'rgba(0,0,0,0.5)',
    zIndex: 10,
  },
  maskRight: {
     position: 'absolute',
     right: 0,
     top: 0,
     bottom: 0,
     backgroundColor: 'rgba(0,0,0,0.5)',
     zIndex: 10,
  },
  middleImage: {
      position: 'absolute',
      width: SCREEN_WIDTH, 
      zIndex: 20,
      left: 0,
      // The image frame should be centered over the reels
      // top is handled dynamically or via flex centering in parent if possible
  },
  bottom: {
    position: 'absolute',
    bottom: 50,
     width: '100%',
     alignItems: 'center',
     zIndex: 30,
  },
  skipBtn: {
      backgroundColor: 'rgba(255,255,255,0.2)',
      paddingHorizontal: 30,
      paddingVertical: 10,
      borderRadius: 32,
      borderWidth: 1,
      borderColor: 'rgba(255,255,255,0.4)',
  },
  skipText: {
      color: '#fff',
      fontSize: 14,
  },
});