import { ArticleCard } from '@/components/ArticleCard';
import { PlanCard } from '@/components/PlanCard';
import { SearchBox } from '@/components/SearchBox';
import { ThemedText } from '@/components/ThemedText';
import { ThemedView } from '@/components/ThemedView';
import { Colors } from '@/constants/Colors';
import { useColorScheme } from '@/hooks/useColorScheme';
import { listRecommendedArticles } from '@/services/articles';
import { fetchRecommendations, RecommendationType } from '@/services/recommendations';
// Removed WorkoutCard import since we no longer use the horizontal carousel
import { useAuthGuard } from '@/hooks/useAuthGuard';
import { getChineseGreeting } from '@/utils/date';
import dayjs from 'dayjs';
import { useRouter } from 'expo-router';
import React from 'react';
import { Animated, Image, PanResponder, Pressable, SafeAreaView, ScrollView, StyleSheet, useWindowDimensions, View } from 'react-native';
import { useSafeAreaInsets } from 'react-native-safe-area-context';

// 移除旧的“热门活动”滑动数据，改为固定的“热点功能”卡片

export default function HomeScreen() {
  const router = useRouter();
  const { pushIfAuthedElseLogin, isLoggedIn } = useAuthGuard();
  const theme = (useColorScheme() ?? 'light') as 'light' | 'dark';
  const colorTokens = Colors[theme];
  const insets = useSafeAreaInsets();
  const { width: windowWidth, height: windowHeight } = useWindowDimensions();

  // Draggable coach badge state
  const pan = React.useRef(new Animated.ValueXY()).current;
  const [coachSize, setCoachSize] = React.useState({ width: 0, height: 0 });
  const hasInitPos = React.useRef(false);
  const startRef = React.useRef({ x: 0, y: 0 });
  const dragState = React.useRef({ moved: false });

  const clamp = (value: number, min: number, max: number) => Math.max(min, Math.min(max, value));

  const panResponder = React.useMemo(() => PanResponder.create({
    onStartShouldSetPanResponder: () => true,
    onMoveShouldSetPanResponder: (_evt, gesture) => Math.abs(gesture.dx) + Math.abs(gesture.dy) > 2,
    onPanResponderGrant: () => {
      dragState.current.moved = false;
      // @ts-ignore access current value
      const currentX = (pan.x as any)._value ?? 0;
      // @ts-ignore access current value
      const currentY = (pan.y as any)._value ?? 0;
      startRef.current = { x: currentX, y: currentY };
    },
    onPanResponderMove: (_evt, gesture) => {
      if (!dragState.current.moved && (Math.abs(gesture.dx) + Math.abs(gesture.dy) > 4)) {
        dragState.current.moved = true;
      }
      const nextX = startRef.current.x + gesture.dx;
      const nextY = startRef.current.y + gesture.dy;
      pan.setValue({ x: nextX, y: nextY });
    },
    onPanResponderRelease: (_evt, gesture) => {
      const minX = 8;
      const minY = insets.top + 2;
      const maxX = Math.max(minX, windowWidth - coachSize.width - 8);
      const maxY = Math.max(minY, windowHeight - coachSize.height - (insets.bottom + 8));
      const rawX = startRef.current.x + gesture.dx;
      const rawY = startRef.current.y + gesture.dy;
      const clampedX = clamp(rawX, minX, maxX);
      const clampedY = clamp(rawY, minY, maxY);
      // Snap horizontally to nearest side (left/right only)
      const distLeft = Math.abs(clampedX - minX);
      const distRight = Math.abs(maxX - clampedX);
      const snapX = distLeft <= distRight ? minX : maxX;
      Animated.spring(pan, { toValue: { x: snapX, y: clampedY }, useNativeDriver: false, bounciness: 6 }).start(() => {
        if (!dragState.current.moved) {
          // Treat as tap
          // @ts-ignore - expo-router string ok
          router.push('/ai-coach-chat?name=Iris' as any);
        }
      });
    },
  }), [coachSize.height, coachSize.width, insets.bottom, insets.top, pan, windowHeight, windowWidth, router]);
  // 推荐项类型（本地 UI 使用）
  type RecommendItem =
    | {
      type: 'plan';
      key: string;
      image: string;
      title: string;
      subtitle: string;
      level?: '初学者' | '中级' | '高级';
      progress: number;
      onPress?: () => void;
    }
    | {
      type: 'article';
      key: string;
      id: string;
      title: string;
      coverImage: string;
      publishedAt: string;
      readCount: number;
    };

  // 打底数据（接口不可用时）
  const getFallbackItems = React.useCallback((): RecommendItem[] => {
    return [
      {
        type: 'plan',
        key: 'assess',
        image:
          'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/imagedemo.jpeg',
        title: '体态评估',
        subtitle: '评估你的体态，制定训练计划',
        level: '初学者',
        progress: 0,
        onPress: () => router.push('/ai-posture-assessment'),
      },
      ...listRecommendedArticles().map((a) => ({
        type: 'article' as const,
        key: `article-${a.id}`,
        id: a.id,
        title: a.title,
        coverImage: a.coverImage,
        publishedAt: a.publishedAt,
        readCount: a.readCount,
      })),
    ];
  }, [router]);

  const [items, setItems] = React.useState<RecommendItem[]>(() => getFallbackItems());

  // 拉取推荐接口（已登录时）
  React.useEffect(() => {
    let canceled = false;
    async function load() {
      if (!isLoggedIn) {
        console.log('fetchRecommendations not logged in');
        setItems(getFallbackItems());
        return;
      }
      try {
        const cards = await fetchRecommendations();

        if (canceled) return;
        const mapped: RecommendItem[] = [];
        for (const c of cards || []) {
          if (c.type === RecommendationType.Article) {
            const publishedAt = (c.extra && (c.extra.publishedDate || c.extra.published_at)) || new Date().toISOString();
            const readCount = (c.extra && (c.extra.readCount ?? c.extra.read_count)) || 0;
            mapped.push({
              type: 'article',
              key: c.id,
              id: c.articleId || c.id,
              title: c.title || '',
              coverImage: c.coverUrl,
              publishedAt,
              readCount,
            });
          } else if (c.type === RecommendationType.Checkin) {
            mapped.push({
              type: 'plan',
              key: c.id || 'checkin',
              image: 'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/imagedemo.jpeg',
              title: c.title || '今日打卡',
              subtitle: c.subtitle || '完成一次普拉提训练，记录你的坚持',
              progress: 0,
              onPress: () => pushIfAuthedElseLogin('/checkin?date=' + dayjs().format('YYYY-MM-DD')),
            });
          }
        }
        // 若接口返回空，也回退到打底
        setItems(mapped.length > 0 ? mapped : getFallbackItems());
      } catch (e) {
        console.error('fetchRecommendations error', e);
        setItems(getFallbackItems());
      }
    }
    load();
    return () => { canceled = true; };
  }, [isLoggedIn, pushIfAuthedElseLogin, getFallbackItems]);

  return (
    <SafeAreaView style={[styles.safeArea, { backgroundColor: theme === 'light' ? colorTokens.pageBackgroundEmphasis : colorTokens.background }]}>
      <ThemedView style={[styles.container, { backgroundColor: theme === 'light' ? colorTokens.pageBackgroundEmphasis : colorTokens.background }]}>
        {/* Floating Coach Badge */}
        <View pointerEvents="box-none" style={styles.coachOverlayWrap}>
          <Animated.View
            {...panResponder.panHandlers}
            onLayout={(e) => {
              const { width, height } = e.nativeEvent.layout;
              if (width !== coachSize.width || height !== coachSize.height) {
                setCoachSize({ width, height });
              }
              if (!hasInitPos.current && width > 0 && windowWidth > 0) {
                const initX = windowWidth - width - 14;
                const initY = insets.top + 2; // 默认更靠上，避免遮挡搜索框
                pan.setValue({ x: initX, y: initY });
                hasInitPos.current = true;
              }
            }}
            style={[
              styles.coachBadge,
              {
                transform: [{ translateX: pan.x }, { translateY: pan.y }],
                backgroundColor: colorTokens.heroSurfaceTint,
                borderColor: 'rgba(187,242,70,0.35)',
                shadowColor: '#000',
                shadowOpacity: 0.08,
                shadowRadius: 10,
                shadowOffset: { width: 0, height: 4 },
                elevation: 3,
                position: 'absolute',
                left: 0,
                top: 0,
              },
            ]}
          >
            <Image
              source={{ uri: 'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/avatar/imageCoach01.jpeg' }}
              style={styles.coachAvatar}
            />
            <View style={styles.coachMeta}>
              <ThemedText style={styles.coachName}>Iris</ThemedText>
              <View style={styles.coachStatusRow}>
                <View style={styles.statusDot} />
                <ThemedText style={styles.coachStatusText}>在线</ThemedText>
              </View>
            </View>
          </Animated.View>
        </View>
        <ScrollView showsVerticalScrollIndicator={false}>
          {/* Header Section */}
          <View style={styles.header}>
            <ThemedText style={styles.greeting}>{getChineseGreeting()}</ThemedText>
            <ThemedText style={styles.userName}>新学员，欢迎你</ThemedText>
          </View>

          {/* Search Box */}
          <SearchBox placeholder="搜索" />

          {/* Hot Features Section */}
          <View style={styles.sectionContainer}>
            <ThemedText style={styles.sectionTitle}>热点功能</ThemedText>

            <View style={styles.featureGrid}>
              <Pressable
                style={[styles.featureCard, styles.featureCardPrimary]}
                onPress={() => router.push('/ai-posture-assessment')}
              >
                <ThemedText style={styles.featureTitle}>AI体态评估</ThemedText>
                <ThemedText style={styles.featureSubtitle}>3分钟获取体态报告</ThemedText>
              </Pressable>

              <Pressable
                style={[styles.featureCard, styles.featureCardSecondary]}
                onPress={() => router.push('/ai-coach-chat?name=Sarah' as any)}
              >
                <ThemedText style={styles.featureTitle}>在线教练</ThemedText>
                <ThemedText style={styles.featureSubtitle}>认证教练 · 1对1即时解答</ThemedText>
              </Pressable>

              <Pressable
                style={[styles.featureCard, styles.featureCardTertiary]}
                onPress={() => pushIfAuthedElseLogin('/checkin?date=' + dayjs().format('YYYY-MM-DD'))}
              >
                <ThemedText style={styles.featureTitle}>每日打卡</ThemedText>
                <ThemedText style={styles.featureSubtitle}>自选动作 · 记录完成</ThemedText>
              </Pressable>

              <Pressable
                style={[styles.featureCard, styles.featureCardQuaternary]}
                onPress={() => pushIfAuthedElseLogin('/training-plan')}
              >
                <ThemedText style={styles.featureTitle}>训练计划制定</ThemedText>
                <ThemedText style={styles.featureSubtitle}>按周安排 · 个性化目标</ThemedText>
              </Pressable>
            </View>
          </View>

          {/* Today Plan Section */}
          <View style={styles.sectionContainer}>
            <ThemedText style={styles.sectionTitle}>为你推荐</ThemedText>

            <View style={styles.planList}>
              {items.map((item) => {
                if (item.type === 'article') {
                  return (
                    <ArticleCard
                      key={item.key}
                      id={item.id}
                      title={item.title}
                      coverImage={item.coverImage}
                      publishedAt={item.publishedAt}
                      readCount={item.readCount}
                    />
                  );
                }
                const card = (
                  <PlanCard
                    image={item.image}
                    title={item.title}
                    subtitle={item.subtitle}
                    level={item.level}
                    progress={item.progress}
                  />
                );
                return item.onPress ? (
                  <Pressable key={item.key} onPress={item.onPress}>
                    {card}
                  </Pressable>
                ) : (
                  <View key={item.key}>{card}</View>
                );
              })}
            </View>
          </View>



          {/* Add some spacing at the bottom */}
          <View style={styles.bottomSpacing} />
        </ScrollView>
      </ThemedView>
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  safeArea: {
    flex: 1,
    backgroundColor: '#F7F8FA',
  },
  container: {
    flex: 1,
    backgroundColor: '#F7F8FA',
  },
  header: {
    paddingHorizontal: 24,
    paddingTop: 16,
    paddingBottom: 8,
  },
  coachOverlayWrap: {
    position: 'absolute',
    top: 0,
    left: 0,
    right: 0,
    bottom: 0,
    zIndex: 10,
  },
  greeting: {
    fontSize: 16,
    color: '#8A8A8E',
    fontWeight: '400',
    marginBottom: 6,
  },
  userName: {
    fontSize: 30,
    fontWeight: 'bold',
    color: '#1A1A1A',
    lineHeight: 36,
  },
  coachBadge: {
    flexDirection: 'row',
    alignItems: 'center',
    // RN 不完全支持 gap，这里用 margin 实现
    paddingHorizontal: 10,
    paddingVertical: 8,
    borderRadius: 20,
    borderWidth: 1,
    backgroundColor: '#FFFFFF00',
  },
  coachAvatar: {
    width: 26,
    height: 26,
    borderRadius: 13,
  },
  coachMeta: {
    marginLeft: 8,
  },
  coachName: {
    fontSize: 13,
    fontWeight: '700',
    color: '#192126',
  },
  coachStatusRow: {
    flexDirection: 'row',
    alignItems: 'center',
    marginTop: 2,
  },
  statusDot: {
    width: 6,
    height: 6,
    borderRadius: 3,
    backgroundColor: '#22C55E',
    marginRight: 4,
  },
  coachStatusText: {
    fontSize: 11,
    color: '#6B7280',
  },
  sectionContainer: {
    marginTop: 24,
  },
  sectionTitle: {
    fontSize: 24,
    fontWeight: 'bold',
    color: '#1A1A1A',
    paddingHorizontal: 24,
    marginBottom: 18,
  },
  featureGrid: {
    paddingHorizontal: 24,
    flexDirection: 'row',
    justifyContent: 'space-between',
    flexWrap: 'wrap',
  },
  featureCard: {
    width: '48%',
    borderRadius: 12,
    padding: 12,
    backgroundColor: '#FFFFFF',
    marginBottom: 12,
    // 轻量阴影，减少臃肿感
    shadowColor: '#000',
    shadowOpacity: 0.04,
    shadowRadius: 8,
    shadowOffset: { width: 0, height: 4 },
    elevation: 2,
  },
  featureCardPrimary: {
    backgroundColor: '#EEF2FF', // 柔和的靛蓝背景
  },
  featureCardSecondary: {
    backgroundColor: '#F0FDFA', // 柔和的青绿背景
  },
  featureCardTertiary: {
    backgroundColor: '#FFF7ED', // 柔和的橙色背景
  },
  featureCardQuaternary: {
    backgroundColor: '#F5F3FF', // 柔和的紫色背景
  },
  featureIcon: {
    fontSize: 28,
    marginBottom: 8,
  },
  featureTitle: {
    fontSize: 16,
    fontWeight: '700',
    color: '#0F172A',
    marginBottom: 4,
  },
  featureSubtitle: {
    fontSize: 11,
    color: '#6B7280',
    lineHeight: 15,
  },
  planList: {
    paddingHorizontal: 24,
  },
  // 移除旧的滑动样式
  bottomSpacing: {
    height: 120,
  },
});