import { AnimatedNumber } from '@/components/AnimatedNumber';
import { BMICard } from '@/components/BMICard';
import { CircularRing } from '@/components/CircularRing';
import { NutritionRadarCard } from '@/components/NutritionRadarCard';
import { ProgressBar } from '@/components/ProgressBar';
import { StressAnalysisModal } from '@/components/StressAnalysisModal';
import { StressMeter } from '@/components/StressMeter';
import { WeightHistoryCard } from '@/components/WeightHistoryCard';
import { Colors } from '@/constants/Colors';
import { getTabBarBottomPadding } from '@/constants/TabBar';
import { useAppSelector } from '@/hooks/redux';
import { useAuthGuard } from '@/hooks/useAuthGuard';
import { useColorScheme } from '@/hooks/useColorScheme';
import { calculateNutritionSummary, getDietRecords, NutritionSummary } from '@/services/dietRecords';
import { getMonthDaysZh, getMonthTitleZh, getTodayIndexInMonth } from '@/utils/date';
import { ensureHealthPermissions, fetchHealthDataForDate } from '@/utils/health';
import { Ionicons } from '@expo/vector-icons';
import { useBottomTabBarHeight } from '@react-navigation/bottom-tabs';
import { useFocusEffect } from '@react-navigation/native';
import dayjs from 'dayjs';
import { LinearGradient } from 'expo-linear-gradient';
import React, { useEffect, useMemo, useRef, useState } from 'react';
import {
  SafeAreaView,
  ScrollView,
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
} from 'react-native';
import { useSafeAreaInsets } from 'react-native-safe-area-context';

export default function ExploreScreen() {
  const theme = (useColorScheme() ?? 'light') as 'light' | 'dark';
  const colorTokens = Colors[theme];

  const stepGoal = useAppSelector((s) => s.user.profile?.dailyStepsGoal) ?? 2000;
  const userProfile = useAppSelector((s) => s.user.profile);

  const { pushIfAuthedElseLogin, isLoggedIn } = useAuthGuard();

  // 使用 dayjs：当月日期与默认选中“今天”
  const days = getMonthDaysZh();
  const [selectedIndex, setSelectedIndex] = useState(getTodayIndexInMonth());
  const tabBarHeight = useBottomTabBarHeight();
  const insets = useSafeAreaInsets();
  const bottomPadding = useMemo(() => {
    return getTabBarBottomPadding(tabBarHeight) + (insets?.bottom ?? 0);
  }, [tabBarHeight, insets?.bottom]);

  const monthTitle = getMonthTitleZh();

  // 日期条自动滚动到选中项
  const daysScrollRef = useRef<import('react-native').ScrollView | null>(null);
  const [scrollWidth, setScrollWidth] = useState(0);
  const DAY_PILL_WIDTH = 68;
  const DAY_PILL_SPACING = 12;

  const scrollToIndex = (index: number, animated = true) => {
    const baseOffset = index * (DAY_PILL_WIDTH + DAY_PILL_SPACING);
    const centerOffset = Math.max(0, baseOffset - (scrollWidth / 2 - DAY_PILL_WIDTH / 2));
    daysScrollRef.current?.scrollTo({ x: centerOffset, animated });
  };

  useEffect(() => {
    if (scrollWidth > 0) {
      scrollToIndex(selectedIndex, false);
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [scrollWidth]);

  // HealthKit: 每次页面聚焦都拉取今日数据
  const [stepCount, setStepCount] = useState<number | null>(null);
  const [activeCalories, setActiveCalories] = useState<number | null>(null);
  // 睡眠时长（分钟）
  const [sleepDuration, setSleepDuration] = useState<number | null>(null);
  // HRV数据
  const [hrvValue, setHrvValue] = useState<number>(0);
  const [hrvUpdateTime, setHrvUpdateTime] = useState<Date>(new Date());

  const [isLoading, setIsLoading] = useState(false);
  // 用于触发动画重置的 token（当日期或数据变化时更新）
  const [animToken, setAnimToken] = useState(0);
  const [trainingProgress, setTrainingProgress] = useState(0); // 暂定静态80%

  // 营养数据状态
  const [nutritionSummary, setNutritionSummary] = useState<NutritionSummary | null>(null);
  const [isNutritionLoading, setIsNutritionLoading] = useState(false);

  // 压力分析浮窗状态
  const [showStressModal, setShowStressModal] = useState(false);

  // 记录最近一次请求的“日期键”，避免旧请求覆盖新结果
  const latestRequestKeyRef = useRef<string | null>(null);

  const getDateKey = (d: Date) => `${dayjs(d).year()}-${dayjs(d).month() + 1}-${dayjs(d).date()}`;


  const loadHealthData = async (targetDate?: Date) => {
    try {
      console.log('=== 开始HealthKit初始化流程 ===');
      setIsLoading(true);

      const ok = await ensureHealthPermissions();
      if (!ok) {
        const errorMsg = '无法获取健康权限，请确保在真实iOS设备上运行并授权应用访问健康数据';
        console.warn(errorMsg);
        return;
      }

      // 确定要查询的日期：优先使用传入的日期，否则使用当前选中索引对应的日期
      let derivedDate: Date;
      if (targetDate) {
        derivedDate = targetDate;
      } else {
        derivedDate = days[selectedIndex]?.date?.toDate() ?? new Date();
      }

      const requestKey = getDateKey(derivedDate);
      latestRequestKeyRef.current = requestKey;

      console.log('权限获取成功，开始获取健康数据...', derivedDate);
      const data = await fetchHealthDataForDate(derivedDate);

      console.log('设置UI状态:', data);
      // 仅当该请求仍是最新时，才应用结果
      if (latestRequestKeyRef.current === requestKey) {
        setStepCount(data.steps);
        setActiveCalories(Math.round(data.activeEnergyBurned));
        setSleepDuration(data.sleepDuration);

        const hrv = data.hrv ?? 0;
        setHrvValue(hrv);

        // 更新HRV数据时间
        setHrvUpdateTime(new Date());

        setAnimToken((t) => t + 1);
      } else {
        console.log('忽略过期健康数据请求结果，key=', requestKey, '最新key=', latestRequestKeyRef.current);
      }
      console.log('=== HealthKit数据获取完成 ===');

    } catch (error) {
      console.error('HealthKit流程出现异常:', error);
    } finally {
      setIsLoading(false);
    }
  };

  // 加载营养数据
  const loadNutritionData = async (targetDate?: Date) => {
    try {
      setIsNutritionLoading(true);

      // 确定要查询的日期：优先使用传入的日期，否则使用当前选中索引对应的日期
      let derivedDate: Date;
      if (targetDate) {
        derivedDate = targetDate;
      } else {
        derivedDate = days[selectedIndex]?.date?.toDate() ?? new Date();
      }

      console.log('加载营养数据...', derivedDate);
      const data = await getDietRecords({
        startDate: dayjs(derivedDate).startOf('day').toISOString(),
        endDate: dayjs(derivedDate).endOf('day').toISOString(),
      });

      if (data.records.length > 0) {
        const summary = calculateNutritionSummary(data.records);
        setNutritionSummary(summary);
      } else {
        setNutritionSummary(null);
      }
      console.log('营养数据加载完成:', data);

    } catch (error) {
      console.error('营养数据加载失败:', error);
      setNutritionSummary(null);
    } finally {
      setIsNutritionLoading(false);
    }
  };

  useFocusEffect(
    React.useCallback(() => {
      // 聚焦时按当前选中的日期加载，避免与用户手动选择的日期不一致
      const currentDate = days[selectedIndex]?.date?.toDate();
      if (currentDate) {
        loadHealthData(currentDate);
        if (isLoggedIn) {
          loadNutritionData(currentDate);
        }
      }
    }, [selectedIndex])
  );

  // 日期点击时，加载对应日期数据
  const onSelectDate = (index: number) => {
    setSelectedIndex(index);
    scrollToIndex(index);
    const target = days[index]?.date?.toDate();
    if (target) {
      loadHealthData(target);
      if (isLoggedIn) {
        loadNutritionData(target);
      }
    }
  };

  // 处理压力卡片点击
  const handleStressCardPress = () => {
    setShowStressModal(true);
  };

  // 关闭压力分析浮窗
  const handleCloseStressModal = () => {
    setShowStressModal(false);
  };

  // 使用统一的渐变背景色
  const backgroundGradientColors = [colorTokens.backgroundGradientStart, colorTokens.backgroundGradientEnd] as const;

  return (
    <View style={styles.container}>
      <LinearGradient
        colors={backgroundGradientColors}
        style={styles.gradientBackground}
        start={{ x: 0, y: 0 }}
        end={{ x: 0, y: 1 }}
      />
      <SafeAreaView style={styles.safeArea}>
        <ScrollView
          style={styles.scrollView}
          contentContainerStyle={{ paddingBottom: bottomPadding }}
          showsVerticalScrollIndicator={false}
        >
          {/* 体重历史记录卡片 */}
          <Text style={styles.sectionTitle}>健康数据</Text>
          <WeightHistoryCard />

          {/* 标题与日期选择 */}
          <Text style={styles.monthTitle}>{monthTitle}</Text>
          <ScrollView
            horizontal
            showsHorizontalScrollIndicator={false}
            contentContainerStyle={styles.daysContainer}
            ref={daysScrollRef}
            onLayout={(e) => setScrollWidth(e.nativeEvent.layout.width)}
          >
            {days.map((d, i) => {
              const selected = i === selectedIndex;
              return (
                <View key={`${d.dayOfMonth}`} style={styles.dayItemWrapper}>
                  <TouchableOpacity
                    style={[styles.dayPill, selected ? styles.dayPillSelected : styles.dayPillNormal]}
                    onPress={() => onSelectDate(i)}
                    activeOpacity={0.8}
                  >
                    <Text style={[styles.dayLabel, selected && styles.dayLabelSelected]}> {d.weekdayZh} </Text>
                    <Text style={[styles.dayDate, selected && styles.dayDateSelected]}>{d.dayOfMonth}</Text>
                  </TouchableOpacity>
                  {selected && <View style={styles.selectedDot} />}
                </View>
              );
            })}
          </ScrollView>

          {/* 营养摄入雷达图卡片 */}
          <NutritionRadarCard
            nutritionSummary={nutritionSummary}
          />

          {/* 真正瀑布流布局 */}
          <View style={styles.masonryContainer}>
            {/* 左列 */}
            <View style={styles.masonryColumn}>
              <StressMeter
                value={hrvValue}
                updateTime={hrvUpdateTime}
                style={styles.masonryCard}
                onPress={handleStressCardPress}
              />

              <View style={[styles.masonryCard, styles.caloriesCard]}>
                <Text style={styles.cardTitleSecondary}>消耗卡路里</Text>
                {activeCalories != null ? (
                  <AnimatedNumber
                    value={activeCalories}
                    resetToken={animToken}
                    style={styles.caloriesValue}
                    format={(v) => `${Math.round(v)} 千卡`}
                  />
                ) : (
                  <Text style={styles.caloriesValue}>——</Text>
                )}
              </View>

              <View style={[styles.masonryCard, styles.stepsCard]}>
                <View style={styles.cardHeaderRow}>
                  <View style={styles.iconSquare}>
                    <Ionicons name="footsteps-outline" size={18} color="#192126" />
                  </View>
                  <Text style={styles.cardTitle}>步数</Text>
                </View>
                {stepCount != null ? (
                  <AnimatedNumber
                    value={stepCount}
                    resetToken={animToken}
                    style={styles.stepsValue}
                    format={(v) => `${Math.round(v)}/${stepGoal}`}
                  />
                ) : (
                  <Text style={styles.stepsValue}>——/{stepGoal}</Text>
                )}
                <ProgressBar
                  progress={Math.min(1, Math.max(0, (stepCount ?? 0) / stepGoal))}
                  height={16}
                  trackColor="#FFEBCB"
                  fillColor="#FFC365"
                  showLabel={false}
                />
              </View>
            </View>

            {/* 右列 */}
            <View style={styles.masonryColumn}>
              <BMICard
                weight={userProfile?.weight ? parseFloat(userProfile.weight) : undefined}
                height={userProfile?.height ? parseFloat(userProfile.height) : undefined}
                style={styles.masonryCardNoBg}
              // compact={true}
              />

              <View style={[styles.masonryCard, styles.trainingCard]}>
                <Text style={styles.cardTitleSecondary}>训练时间</Text>
                <View style={styles.trainingContent}>
                  <CircularRing
                    size={120}
                    strokeWidth={12}
                    trackColor="#E2D9FD"
                    progressColor="#8B74F3"
                    progress={trainingProgress}
                    resetToken={animToken}
                  />
                </View>
              </View>

              <View style={[styles.masonryCard, styles.sleepCard]}>
                <View style={styles.cardHeaderRow}>
                  <View style={styles.iconSquare}>
                    <Ionicons name="moon-outline" size={18} color="#192126" />
                  </View>
                  <Text style={styles.cardTitle}>睡眠</Text>
                </View>
                {sleepDuration != null ? (
                  <Text style={styles.sleepValue}>
                    {Math.floor(sleepDuration / 60)}小时{Math.floor(sleepDuration % 60)}分钟
                  </Text>
                ) : (
                  <Text style={styles.sleepValue}>——</Text>
                )}
              </View>
            </View>
          </View>





        </ScrollView>
      </SafeAreaView>

      {/* 压力分析浮窗 */}
      <StressAnalysisModal
        visible={showStressModal}
        onClose={handleCloseStressModal}
        hrvValue={hrvValue}
        updateTime={hrvUpdateTime}
      />
    </View>
  );
}

const primary = Colors.light.primary;
const lightColors = Colors.light;
const darkColors = Colors.dark;

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  gradientBackground: {
    position: 'absolute',
    left: 0,
    right: 0,
    top: 0,
    bottom: 0,
  },
  safeArea: {
    flex: 1,
  },
  scrollView: {
    flex: 1,
    paddingHorizontal: 20,
  },
  monthTitle: {
    fontSize: 24,
    fontWeight: '800',
    color: '#192126',
    marginTop: 8,
    marginBottom: 14,
  },
  daysContainer: {
    paddingBottom: 8,
  },
  dayItemWrapper: {
    alignItems: 'center',
    width: 68,
    marginRight: 12,
  },
  dayPill: {
    width: 68,
    height: 68,
    borderRadius: 18,
    alignItems: 'center',
    justifyContent: 'center',
  },
  dayPillNormal: {
    backgroundColor: lightColors.datePickerNormal,
  },
  dayPillSelected: {
    backgroundColor: lightColors.datePickerSelected,
  },
  dayLabel: {
    fontSize: 16,
    fontWeight: '700',
    color: '#192126',
    marginBottom: 2,
  },
  dayLabelSelected: {
    color: '#FFFFFF',
  },
  dayDate: {
    fontSize: 16,
    fontWeight: '800',
    color: '#192126',
  },
  dayDateSelected: {
    color: '#FFFFFF',
  },
  selectedDot: {
    width: 8,
    height: 8,
    borderRadius: 4,
    backgroundColor: lightColors.datePickerSelected,
    marginTop: 10,
    marginBottom: 4,
    alignSelf: 'center',
  },
  sectionTitle: {
    fontSize: 24,
    fontWeight: '800',
    color: '#192126',
    marginTop: 24,
    marginBottom: 14,
  },
  metricsRow: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    marginBottom: 16,
  },
  card: {
    backgroundColor: '#0F1418',
    borderRadius: 22,
    padding: 18,
    marginBottom: 16,
  },
  metricsLeft: {
    flex: 1,
    backgroundColor: '#EEE9FF',
    borderRadius: 22,
    padding: 18,
    marginRight: 12,
  },
  metricsRight: {
    width: 160,
    gap: 12,
  },
  metricsRightCard: {
    backgroundColor: '#FFFFFF',
    borderRadius: 22,
    padding: 16,
  },
  caloriesCard: {
    backgroundColor: '#FFFFFF',
  },
  trainingCard: {
    backgroundColor: '#EEE9FF',
  },

  cardTitleSecondary: {
    color: '#9AA3AE',
    fontSize: 14,
    fontWeight: '600',
    marginBottom: 10,
  },
  caloriesValue: {
    color: '#192126',
    fontSize: 22,
    fontWeight: '800',
  },
  trainingContent: {
    marginTop: 8,
    width: 120,
    height: 120,
    borderRadius: 60,
    alignItems: 'center',
    justifyContent: 'center',
    alignSelf: 'center',
  },
  trainingRingTrack: {
    position: 'absolute',
    width: '100%',
    height: '100%',
    borderRadius: 60,
    borderWidth: 12,
    borderColor: '#E2D9FD',
  },
  trainingRingProgress: {
    position: 'absolute',
    width: '100%',
    height: '100%',
    borderRadius: 60,
    borderWidth: 12,
    borderColor: 'transparent',
    borderTopColor: '#8B74F3',
    borderRightColor: '#8B74F3',
    transform: [{ rotateZ: '45deg' }],
  },
  trainingPercent: {
    fontSize: 18,
    fontWeight: '800',
    color: '#8B74F3',
  },
  cyclingHeader: {
    flexDirection: 'row',
    alignItems: 'center',
    marginBottom: 12,
  },
  cyclingIconBadge: {
    width: 30,
    height: 30,
    borderRadius: 6,
    backgroundColor: primary,
    alignItems: 'center',
    justifyContent: 'center',
    marginRight: 8,
  },
  cyclingTitle: {
    color: '#FFFFFF',
    fontSize: 20,
    fontWeight: '800',
  },
  mapArea: {
    backgroundColor: 'rgba(255,255,255,0.08)',
    borderRadius: 14,
    height: 180,
    padding: 8,
    flexDirection: 'row',
    flexWrap: 'wrap',
    overflow: 'hidden',
  },
  mapTile: {
    width: '25%',
    height: '25%',
    borderWidth: 1,
    borderColor: 'rgba(255,255,255,0.12)',
  },
  routeLine: {
    position: 'absolute',
    height: 6,
    backgroundColor: primary,
    borderRadius: 3,
  },
  cardHeaderRow: {
    flexDirection: 'row',
    alignItems: 'center',
    marginBottom: 12,
  },
  iconSquare: {
    width: 30,
    height: 30,
    borderRadius: 8,
    backgroundColor: '#FFFFFF',
    alignItems: 'center',
    justifyContent: 'center',
    marginRight: 10,
  },
  cardTitle: {
    fontSize: 18,
    fontWeight: '800',
    color: '#192126',
  },
  heartCard: {
    backgroundColor: '#FFE5E5',
  },
  waveContainer: {
    flexDirection: 'row',
    alignItems: 'flex-end',
    height: 70,
    gap: 6,
    marginBottom: 8,
  },
  waveBar: {
    width: 6,
    borderRadius: 3,
    backgroundColor: '#E54D4D',
  },
  heartValue: {
    alignSelf: 'flex-end',
    color: '#5B5B5B',
    fontWeight: '600',
  },
  stepsCard: {
    backgroundColor: '#FFE4B8',
  },
  stepsValue: {
    fontSize: 16,
    color: '#7A6A42',
    fontWeight: '700',
    marginBottom: 8,
  },
  errorContainer: {
    flexDirection: 'row',
    alignItems: 'center',
    backgroundColor: '#FFE5E5',
    borderRadius: 12,
    padding: 12,
    marginBottom: 16,
  },
  errorText: {
    fontSize: 14,
    color: '#E54D4D',
    fontWeight: '600',
    marginLeft: 8,
    flex: 1,
  },
  retryButton: {
    padding: 4,
    marginLeft: 8,
  },
  viewMoreContainer: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    marginBottom: 16,
  },
  viewMoreText: {
    fontSize: 14,
    color: '#192126',
  },
  viewMoreIcon: {
    fontSize: 16,
    color: '#192126',
    marginLeft: 4,
  },
  stressCardRow: {
    flexDirection: 'row',
    justifyContent: 'flex-start',
    marginBottom: 16,
  },
  healthCardsRow: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    marginBottom: 16,
  },
  compactBMICard: {
    width: 140,
    minHeight: 110,
  },
  healthMetricsContainer: {
    marginBottom: 16,
  },
  masonryContainer: {
    marginBottom: 16,
    flexDirection: 'row',
    justifyContent: 'space-between',
  },
  masonryColumn: {
    flex: 1,
    marginHorizontal: 3,
  },
  masonryCard: {
    width: '100%',
    backgroundColor: '#FFFFFF',
    borderRadius: 16,
    padding: 16,
    shadowColor: '#000',
    shadowOffset: {
      width: 0,
      height: 2,
    },
    shadowOpacity: 0.08,
    shadowRadius: 8,
    elevation: 3,
    marginBottom: 8,
  },
  masonryCardNoBg: {
    width: '100%',
    borderRadius: 16,
    padding: 16,
    shadowColor: '#000',
    shadowOffset: {
      width: 0,
      height: 2,
    },
    shadowOpacity: 0.08,
    shadowRadius: 8,
    elevation: 3,
    marginBottom: 8,
  },
  compactStepsCard: {
    minHeight: 100,
  },
  stepsContent: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    marginTop: 8,
  },
  sleepCard: {
    backgroundColor: '#E8F4FD',
  },
  sleepValue: {
    fontSize: 16,
    color: '#1E40AF',
    fontWeight: '700',
    marginTop: 8,
  },
});