import { HeaderBar } from '@/components/ui/HeaderBar';
import { Colors } from '@/constants/Colors';
import { useAppDispatch, useAppSelector } from '@/hooks/redux';
import { useColorScheme } from '@/hooks/useColorScheme';
import type { CheckinExercise } from '@/store/checkinSlice';
import { getDailyCheckins, removeExercise, replaceExercises, setCurrentDate, toggleExerciseCompleted } from '@/store/checkinSlice';
import { loadPlans, type TrainingPlan } from '@/store/trainingPlanSlice';
import { buildClassicalSession } from '@/utils/classicalSession';
import { Ionicons } from '@expo/vector-icons';
import { useLocalSearchParams, useRouter } from 'expo-router';
import React, { useEffect, useMemo, useRef, useState } from 'react';
import { Alert, FlatList, Modal, SafeAreaView, StyleSheet, Switch, Text, TextInput, TouchableOpacity, View } from 'react-native';

function formatDate(d: Date) {
  const y = d.getFullYear();
  const m = `${d.getMonth() + 1}`.padStart(2, '0');
  const day = `${d.getDate()}`.padStart(2, '0');
  return `${y}-${m}-${day}`;
}

export default function CheckinHome() {
  const dispatch = useAppDispatch();
  const router = useRouter();
  const params = useLocalSearchParams<{ date?: string }>();
  const today = useMemo(() => formatDate(new Date()), []);
  const checkin = useAppSelector((s) => (s as any).checkin);
  const training = useAppSelector((s) => (s as any).trainingPlan);
  const routeDateParam = typeof params?.date === 'string' && params.date ? params.date : undefined;
  const currentDate: string = routeDateParam || (checkin?.currentDate as string) || today;
  const record = checkin?.byDate?.[currentDate] as (undefined | { items?: CheckinExercise[]; note?: string; raw?: any[] });
  const theme = (useColorScheme() ?? 'light') as 'light' | 'dark';
  const colorTokens = Colors[theme];

  console.log('CheckinHome render', {
    currentDate,
    routeDateParam,
    itemsCount: record?.items?.length || 0,
    rawCount: (record as any)?.raw?.length || 0,
  });

  const lastFetchedRef = useRef<string | null>(null);
  useEffect(() => {
    // 初始化当前日期：路由参数优先，其次 store，最后今天
    if (currentDate && checkin?.currentDate !== currentDate) {
      dispatch(setCurrentDate(currentDate));
    }
    // 仅当切换日期时获取一次，避免重复请求
    if (currentDate && lastFetchedRef.current !== currentDate) {
      lastFetchedRef.current = currentDate;
      dispatch(getDailyCheckins(currentDate)).unwrap().catch((err: any) => {
        Alert.alert('获取打卡失败', err?.message || '请稍后重试');
      });
    }
  }, [dispatch, currentDate]);

  // 加载训练计划列表：仅在页面挂载时尝试一次，避免因失败导致的重复请求
  const hasLoadedPlansRef = useRef(false);
  useEffect(() => {
    if (hasLoadedPlansRef.current) return;
    hasLoadedPlansRef.current = true;
    dispatch(loadPlans());
  }, [dispatch]);

  // 同步触发逻辑改为显式操作处调用，避免页面渲染期间的副作用

  const [genVisible, setGenVisible] = useState(false);
  const [genLevel, setGenLevel] = useState<'beginner' | 'intermediate' | 'advanced'>('beginner');
  const [genWithRests, setGenWithRests] = useState(true);
  const [genWithNotes, setGenWithNotes] = useState(true);
  const [genRest, setGenRest] = useState('30');

  // 计算“进行中的训练计划”（startDate <= 当前日期）。若 currentId 存在，优先该计划。
  const activePlan: TrainingPlan | null = useMemo(() => {
    const plans: TrainingPlan[] = training?.plans || [];
    if (!plans.length) return null;
    const current = training?.currentId ? plans.find((p) => p.id === training.currentId) : null;
    const dateObj = new Date(`${currentDate}T00:00:00`);
    if (current && new Date(current.startDate) <= dateObj) return current;
    const ongoing = plans
      .filter((p) => new Date(p.startDate) <= dateObj)
      .sort((a, b) => new Date(b.startDate).getTime() - new Date(a.startDate).getTime());
    return ongoing[0] ?? null;
  }, [training?.plans, training?.currentId, currentDate]);

  const planStartText = useMemo(() => {
    if (!activePlan?.startDate) return '';
    const d = new Date(activePlan.startDate);
    const y = d.getFullYear();
    const m = `${d.getMonth() + 1}`.padStart(2, '0');
    const day = `${d.getDate()}`.padStart(2, '0');
    return `${y}-${m}-${day}`;
  }, [activePlan?.startDate]);

  const onGenerate = () => {
    const restSec = Math.max(10, Math.min(120, parseInt(genRest || '30', 10)));
    const { items, note } = buildClassicalSession({ withSectionRests: genWithRests, restSeconds: restSec, withNotes: genWithNotes, level: genLevel });
    dispatch(replaceExercises({ date: currentDate, items, note }));
    // 自动同步将由中间件处理
    setGenVisible(false);
    Alert.alert('排课已生成', '已为你生成经典普拉提序列，可继续调整。');
  };

  return (
    <SafeAreaView style={[styles.safeArea, { backgroundColor: theme === 'light' ? colorTokens.pageBackgroundEmphasis : colorTokens.background }]}>
      <View style={[styles.container, { backgroundColor: theme === 'light' ? colorTokens.pageBackgroundEmphasis : colorTokens.background }]}>
        <View pointerEvents="none" style={styles.bgOrnaments}>
          <View style={[styles.blob, { backgroundColor: colorTokens.ornamentPrimary, top: -60, right: -60 }]} />
          <View style={[styles.blob, { backgroundColor: colorTokens.ornamentAccent, bottom: -70, left: -70 }]} />
        </View>

        <HeaderBar title="每日打卡" onBack={() => router.back()} withSafeTop={false} transparent />
        <View style={[styles.hero, { backgroundColor: colorTokens.heroSurfaceTint }]}>
          <Text style={[styles.title, { color: colorTokens.text }]}>{currentDate}</Text>
          <Text style={[styles.subtitle, { color: colorTokens.textMuted }]}>请选择动作并记录完成情况</Text>
        </View>

        {/* 训练计划提示（非强制） */}
        <View style={{ paddingHorizontal: 20, marginTop: 8 }}>
          {activePlan ? (
            <View style={[styles.planHintCard, { backgroundColor: colorTokens.card, borderColor: colorTokens.border }]}>
              <View style={{ flex: 1 }}>
                <Text style={[styles.planHintTitle, { color: colorTokens.text }]}>已有训练计划进行中</Text>
                {!!planStartText && (
                  <Text style={[styles.planHintSub, { color: colorTokens.textMuted }]}>开始于 {planStartText}</Text>
                )}
              </View>
              <TouchableOpacity
                style={[styles.hintBtn, { borderColor: colorTokens.primary }]}
                onPress={() => router.push('/training-plan' as any)}
                accessibilityRole="button"
                accessibilityLabel="查看训练计划"
              >
                <Text style={[styles.hintBtnText, { color: colorTokens.primary }]}>查看训练计划</Text>
              </TouchableOpacity>
            </View>
          ) : (
            <View style={[styles.planHintCard, { backgroundColor: colorTokens.card, borderColor: colorTokens.border }]}>
              <View style={{ flex: 1 }}>
                <Text style={[styles.planHintTitle, { color: colorTokens.text }]}>你还没有训练计划</Text>
                <Text style={[styles.planHintSub, { color: colorTokens.textMuted }]}>创建计划可明确每周节奏与目标（可跳过）</Text>
              </View>
              <TouchableOpacity
                style={[styles.hintPrimaryBtn, { backgroundColor: colorTokens.primary }]}
                onPress={() => router.push('/training-plan/create' as any)}
                accessibilityRole="button"
                accessibilityLabel="创建训练计划"
              >
                <Text style={[styles.hintPrimaryBtnText, { color: colorTokens.onPrimary }]}>创建训练计划</Text>
              </TouchableOpacity>
            </View>
          )}
        </View>

        <View style={styles.actionRow}>
          <TouchableOpacity
            style={[styles.primaryBtn, { backgroundColor: colorTokens.primary }]}
            onPress={() => router.push({ pathname: '/checkin/select', params: { date: currentDate } })}
          >
            <Text style={[styles.primaryBtnText, { color: colorTokens.onPrimary }]}>新增动作</Text>
          </TouchableOpacity>
          <View style={{ height: 10 }} />
          <TouchableOpacity
            style={[styles.secondaryBtn, { borderColor: colorTokens.primary }]}
            onPress={() => setGenVisible(true)}
          >
            <Text style={[styles.secondaryBtnText, { color: colorTokens.primary }]}>一键排课（经典序列）</Text>
          </TouchableOpacity>
        </View>

        <FlatList
          data={(record?.items && record.items.length > 0)
            ? record.items
            : ((record as any)?.raw || [])}
          keyExtractor={(item, index) => (item?.key || item?.id || `${currentDate}_${index}`)}
          contentContainerStyle={{ paddingHorizontal: 20, paddingBottom: 20 }}
          ListEmptyComponent={
            <View style={[styles.emptyBox, { backgroundColor: colorTokens.card }]}>
              <Text style={[styles.emptyText, { color: colorTokens.textMuted }]}>还没有选择任何动作，点击“新增动作”开始吧。</Text>
            </View>
          }
          renderItem={({ item }) => {
            // 若为后端原始项（无 key），以标题/时间为卡片，禁用交互
            const isRaw = !item?.key;
            if (isRaw) {
              const title = item?.title || '每日训练打卡';
              const status = item?.status || '';
              const startedAt = item?.startedAt ? new Date(item.startedAt).toLocaleString() : '';
              return (
                <View style={[styles.card, { backgroundColor: colorTokens.card }]}>
                  <View style={{ flex: 1 }}>
                    <Text style={[styles.cardTitle, { color: colorTokens.text }]}>{title}</Text>
                    {!!status && <Text style={[styles.cardMeta, { color: colorTokens.textMuted }]}>{status}</Text>}
                    {!!startedAt && <Text style={[styles.cardMeta, { color: colorTokens.textMuted }]}>{startedAt}</Text>}
                  </View>
                </View>
              );
            }
            const exercise = item as CheckinExercise;
            const type = exercise.itemType ?? 'exercise';
            const isRest = type === 'rest';
            const isNote = type === 'note';
            const cardStyle = [styles.card, { backgroundColor: colorTokens.card }];
            if (isRest || isNote) {
              return (
                <View style={styles.inlineRow}>
                  <Ionicons name={isRest ? 'time-outline' : 'information-circle-outline'} size={14} color={colorTokens.textMuted} />
                  <View style={[styles.inlineBadge, isRest ? styles.inlineBadgeRest : styles.inlineBadgeNote, { borderColor: colorTokens.border }]}>
                    <Text style={[isNote ? styles.inlineTextItalic : styles.inlineText, { color: colorTokens.textMuted }]}>
                      {isRest ? `间隔休息 ${exercise.restSec ?? 30}s` : (exercise.note || '提示')}
                    </Text>
                  </View>
                  <TouchableOpacity
                    style={styles.inlineRemoveBtn}
                    onPress={() =>
                      Alert.alert('确认移除', '确定要移除该条目吗？', [
                        { text: '取消', style: 'cancel' },
                        {
                          text: '移除',
                          style: 'destructive',
                          onPress: () => {
                            dispatch(removeExercise({ date: currentDate, key: exercise.key }));
                            // 自动同步将由中间件处理
                          },
                        },
                      ])
                    }
                    hitSlop={{ top: 6, bottom: 6, left: 6, right: 6 }}
                  >
                    <Ionicons name="close-outline" size={16} color={colorTokens.textMuted} />
                  </TouchableOpacity>
                </View>
              );
            }
            return (
              <View style={cardStyle as any}>
                <View style={{ flex: 1 }}>
                  <Text style={[styles.cardTitle, { color: colorTokens.text }]}>{exercise.name}</Text>
                  <Text style={[styles.cardMeta, { color: colorTokens.textMuted }]}>{exercise.category}</Text>
                  {isNote && (
                    <Text style={[styles.cardMetaItalic, { color: colorTokens.textMuted }]}>{exercise.note || '提示'}</Text>
                  )}
                  {!isNote && (
                    <Text style={[styles.cardMeta, { color: colorTokens.textMuted }]}>
                      {isRest
                        ? `建议休息 ${exercise.restSec ?? 30}s`
                        : `组数 ${exercise.sets}${exercise.reps ? ` · 每组 ${exercise.reps} 次` : ''}${exercise.durationSec ? ` · 每组 ${exercise.durationSec}s` : ''}`}
                    </Text>
                  )}
                </View>
                {type === 'exercise' && (
                  <TouchableOpacity
                    accessibilityRole="button"
                    accessibilityLabel={exercise.completed ? '已完成，点击取消完成' : '未完成，点击标记完成'}
                    style={styles.doneIconBtn}
                    onPress={() => {
                      dispatch(toggleExerciseCompleted({ date: currentDate, key: exercise.key }));
                      // 自动同步将由中间件处理
                    }}
                    hitSlop={{ top: 6, bottom: 6, left: 6, right: 6 }}
                  >
                    <Ionicons
                      name={exercise.completed ? 'checkmark-circle' : 'checkmark-circle-outline'}
                      size={24}
                      color={exercise.completed ? colorTokens.primary : colorTokens.textMuted}
                    />
                  </TouchableOpacity>
                )}
                <TouchableOpacity
                  style={[styles.removeBtn, { backgroundColor: colorTokens.border }]}
                  onPress={() =>
                    Alert.alert('确认移除', '确定要移除该动作吗？', [
                      { text: '取消', style: 'cancel' },
                      {
                        text: '移除',
                        style: 'destructive',
                        onPress: () => {
                          dispatch(removeExercise({ date: currentDate, key: exercise.key }));
                          // 自动同步将由中间件处理
                        },
                      },
                    ])
                  }
                >
                  <Text style={[styles.removeBtnText, { color: colorTokens.text }]}>移除</Text>
                </TouchableOpacity>
              </View>
            );
          }}
        />
        {/* 生成配置弹窗 */}
        <Modal visible={genVisible} transparent animationType="fade" onRequestClose={() => setGenVisible(false)}>
          <TouchableOpacity activeOpacity={1} style={styles.modalOverlay} onPress={() => setGenVisible(false)}>
            <TouchableOpacity activeOpacity={1} style={[styles.modalSheet, { backgroundColor: colorTokens.card }]} onPress={(e) => e.stopPropagation() as any}>
              <Text style={[styles.modalTitle, { color: colorTokens.text }]}>经典排课配置</Text>
              <Text style={[styles.modalLabel, { color: colorTokens.textMuted }]}>强度水平</Text>
              <View style={styles.segmentedRow}>
                {(['beginner', 'intermediate', 'advanced'] as const).map((lv) => (
                  <TouchableOpacity key={lv} style={[styles.segment, genLevel === lv && { backgroundColor: colorTokens.primary }]} onPress={() => setGenLevel(lv)}>
                    <Text style={[styles.segmentText, genLevel === lv && { color: colorTokens.onPrimary }]}>
                      {lv === 'beginner' ? '入门' : lv === 'intermediate' ? '进阶' : '高级'}
                    </Text>
                  </TouchableOpacity>
                ))}
              </View>
              <View style={styles.switchRow}>
                <Text style={[styles.switchLabel, { color: colorTokens.text }]}>段间休息</Text>
                <Switch value={genWithRests} onValueChange={setGenWithRests} />
              </View>
              <View style={styles.switchRow}>
                <Text style={[styles.switchLabel, { color: colorTokens.text }]}>插入操作提示</Text>
                <Switch value={genWithNotes} onValueChange={setGenWithNotes} />
              </View>
              <View style={styles.inputRow}>
                <Text style={[styles.switchLabel, { color: colorTokens.textMuted }]}>休息秒数</Text>
                <TextInput value={genRest} onChangeText={setGenRest} keyboardType="number-pad" style={[styles.input, { borderColor: colorTokens.border, color: colorTokens.text }]} />
              </View>
              <View style={{ height: 8 }} />
              <TouchableOpacity style={[styles.primaryBtn, { backgroundColor: colorTokens.primary }]} onPress={onGenerate}>
                <Text style={[styles.primaryBtnText, { color: colorTokens.onPrimary }]}>生成今日计划</Text>
              </TouchableOpacity>
            </TouchableOpacity>
          </TouchableOpacity>
        </Modal>
      </View>
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  safeArea: { flex: 1, backgroundColor: '#F7F8FA' },
  container: { flex: 1, backgroundColor: '#F7F8FA' },
  header: { paddingHorizontal: 20, paddingTop: 12, paddingBottom: 8 },
  headerRow: { flexDirection: 'row', alignItems: 'center', justifyContent: 'space-between', zIndex: 2 },
  backButton: { width: 32, height: 32, borderRadius: 16, alignItems: 'center', justifyContent: 'center', backgroundColor: '#E5E7EB' },
  hero: { backgroundColor: 'rgba(187,242,70,0.18)', borderRadius: 16, padding: 14 },
  title: { fontSize: 24, fontWeight: '800', color: '#111827' },
  subtitle: { marginTop: 6, fontSize: 12, color: '#6B7280' },
  bgOrnaments: { position: 'absolute', left: 0, right: 0, top: 0, bottom: 0 },
  blob: { position: 'absolute', width: 260, height: 260, borderRadius: 999 },
  blobPrimary: { backgroundColor: '#00000000' },
  blobPurple: { backgroundColor: '#00000000' },
  actionRow: { paddingHorizontal: 20, marginTop: 8 },
  primaryBtn: { backgroundColor: '#111827', paddingVertical: 10, borderRadius: 10, alignItems: 'center' },
  primaryBtnText: { color: '#FFFFFF', fontWeight: '800' },
  secondaryBtn: { borderWidth: 2, paddingVertical: 10, borderRadius: 10, alignItems: 'center' },
  secondaryBtnText: { fontWeight: '800' },
  // 训练计划提示卡片
  planHintCard: { flexDirection: 'row', alignItems: 'center', gap: 10, borderRadius: 14, paddingHorizontal: 14, paddingVertical: 12, borderWidth: 1 },
  planHintTitle: { fontSize: 14, fontWeight: '800' },
  planHintSub: { marginTop: 4, fontSize: 12 },
  hintBtn: { paddingHorizontal: 10, paddingVertical: 8, borderRadius: 10, borderWidth: 1 },
  hintBtnText: { fontWeight: '800' },
  hintPrimaryBtn: { paddingHorizontal: 12, paddingVertical: 10, borderRadius: 10 },
  hintPrimaryBtnText: { fontWeight: '800' },
  emptyBox: { marginTop: 16, backgroundColor: '#FFFFFF', borderRadius: 16, padding: 16, marginHorizontal: 0 },
  emptyText: { color: '#6B7280' },
  card: { marginTop: 12, marginHorizontal: 0, backgroundColor: '#FFFFFF', borderRadius: 16, padding: 16, flexDirection: 'row', alignItems: 'center', gap: 12, shadowColor: '#000', shadowOpacity: 0.06, shadowRadius: 12, shadowOffset: { width: 0, height: 6 }, elevation: 3 },
  cardTitle: { fontSize: 16, fontWeight: '800', color: '#111827' },
  cardMeta: { marginTop: 4, fontSize: 12, color: '#6B7280' },
  cardMetaItalic: { marginTop: 4, fontSize: 12, color: '#6B7280', fontStyle: 'italic' },
  removeBtn: { backgroundColor: '#F3F4F6', paddingHorizontal: 10, paddingVertical: 6, borderRadius: 8 },
  removeBtnText: { color: '#111827', fontWeight: '700' },
  doneIconBtn: { paddingHorizontal: 4, paddingVertical: 4, borderRadius: 16, marginRight: 8 },
  inlineRow: { marginTop: 10, marginHorizontal: 20, flexDirection: 'row', alignItems: 'center' },
  inlineBadge: { marginLeft: 6, borderWidth: 1, borderRadius: 999, paddingVertical: 6, paddingHorizontal: 10 },
  inlineBadgeRest: { backgroundColor: '#F8FAFC' },
  inlineBadgeNote: { backgroundColor: '#F9FAFB' },
  inlineText: { fontSize: 12, fontWeight: '700' },
  inlineTextItalic: { fontSize: 12, fontStyle: 'italic' },
  inlineRemoveBtn: { marginLeft: 6, padding: 4, borderRadius: 999 },
  modalOverlay: { flex: 1, backgroundColor: 'rgba(0,0,0,0.35)', alignItems: 'center', justifyContent: 'flex-end' },
  modalSheet: { width: '100%', borderTopLeftRadius: 16, borderTopRightRadius: 16, paddingHorizontal: 16, paddingTop: 14, paddingBottom: 24 },
  modalTitle: { fontSize: 16, fontWeight: '800', marginBottom: 8 },
  modalLabel: { fontSize: 12, marginBottom: 6 },
  segmentedRow: { flexDirection: 'row', gap: 8, marginBottom: 8 },
  segment: { flex: 1, borderRadius: 999, borderWidth: 1, borderColor: '#E5E7EB', paddingVertical: 8, alignItems: 'center' },
  segmentText: { fontWeight: '700' },
  switchRow: { flexDirection: 'row', alignItems: 'center', justifyContent: 'space-between', marginTop: 8 },
  switchLabel: { fontWeight: '700' },
  inputRow: { marginTop: 8 },
  input: { height: 40, borderWidth: 1, borderRadius: 10, paddingHorizontal: 12 },

});