import { HeaderBar } from '@/components/ui/HeaderBar';
import { Colors } from '@/constants/Colors';
import { useAppDispatch, useAppSelector } from '@/hooks/redux';
import { useAuthGuard } from '@/hooks/useAuthGuard';
import { initChallenge } from '@/store/challengeSlice';
import { estimateSessionMinutesWithCustom } from '@/utils/pilatesPlan';
import { Ionicons } from '@expo/vector-icons';
import { useRouter } from 'expo-router';
import React, { useEffect, useMemo } from 'react';
import { Dimensions, FlatList, SafeAreaView, StyleSheet, Text, TouchableOpacity, View } from 'react-native';

export default function ChallengeHomeScreen() {
  const dispatch = useAppDispatch();
  const router = useRouter();
  const { ensureLoggedIn } = useAuthGuard();
  const challenge = useAppSelector((s) => (s as any).challenge);

  useEffect(() => {
    dispatch(initChallenge());
  }, [dispatch]);

  const progress = useMemo(() => {
    const total = challenge?.days?.length || 30;
    const done = challenge?.days?.filter((d: any) => d.status === 'completed').length || 0;
    return total ? done / total : 0;
  }, [challenge?.days]);

  return (
    <SafeAreaView style={styles.safeArea}>
      <View style={styles.container}>
        <HeaderBar title="30天普拉提打卡" onBack={() => router.back()} withSafeTop={false} transparent />
        <Text style={styles.subtitle}>专注核心、体态与柔韧 · 连续完成解锁徽章</Text>

        {/* 进度环与统计 */}
        <View style={styles.summaryCard}>
          <View style={styles.summaryLeft}>
            <View style={styles.progressPill}>
              <View style={[styles.progressFill, { width: `${Math.round((progress || 0) * 100)}%` }]} />
            </View>
            <Text style={styles.progressText}>{Math.round((progress || 0) * 100)}%</Text>
          </View>
          <View style={styles.summaryRight}>
            <Text style={styles.summaryItem}><Text style={styles.summaryItemValue}>{challenge?.streak ?? 0}</Text> 天连续</Text>
            <Text style={styles.summaryItem}><Text style={styles.summaryItemValue}>{(challenge?.days?.filter((d: any) => d.status === 'completed').length) ?? 0}</Text> / 30 完成</Text>
          </View>
        </View>

        {/* 日历格子（简单 6x5 网格） */}
        <FlatList
          data={challenge?.days || []}
          keyExtractor={(item) => String(item.plan.dayNumber)}
          numColumns={5}
          columnWrapperStyle={{ justifyContent: 'space-between', marginBottom: 12 }}
          contentContainerStyle={{ paddingHorizontal: 20, paddingTop: 10, paddingBottom: 40 }}
          renderItem={({ item }) => {
            const { plan, status } = item;
            const isLocked = status === 'locked';
            const isCompleted = status === 'completed';
            const minutes = estimateSessionMinutesWithCustom(plan, item.custom);
            return (
              <TouchableOpacity
                disabled={isLocked}
                onPress={async () => {
                  if (!(await ensureLoggedIn({ redirectTo: '/challenge', redirectParams: {} }))) return;
                  router.push({ pathname: '/challenge/day', params: { day: String(plan.dayNumber) } });
                }}
                style={[styles.dayCell, isLocked && styles.dayCellLocked, isCompleted && styles.dayCellCompleted]}
                activeOpacity={0.8}
              >
                <Text style={[styles.dayNumber, isLocked && styles.dayNumberLocked]}>{plan.dayNumber}</Text>
                <Text style={styles.dayMinutes}>{minutes}′</Text>
                {isCompleted && <Ionicons name="checkmark-circle" size={18} color="#10B981" style={{ position: 'absolute', top: 6, right: 6 }} />}
                {isLocked && <Ionicons name="lock-closed" size={16} color="#9CA3AF" style={{ position: 'absolute', top: 6, right: 6 }} />}
              </TouchableOpacity>
            );
          }}
        />

        {/* 底部 CTA */}
        <View style={styles.bottomBar}>
          <TouchableOpacity style={styles.startButton} onPress={async () => {
            if (!(await ensureLoggedIn({ redirectTo: '/challenge' }))) return;
            router.push({ pathname: '/challenge/day', params: { day: String((challenge?.days?.find((d: any) => d.status === 'available')?.plan.dayNumber) || 1) } });
          }}>
            <Text style={styles.startButtonText}>开始今日训练</Text>
          </TouchableOpacity>
        </View>
      </View>
    </SafeAreaView>
  );
}

const { width } = Dimensions.get('window');
const cellSize = (width - 40 - 4 * 12) / 5; // 20 padding *2, 12 spacing *4

const styles = StyleSheet.create({
  safeArea: { flex: 1, backgroundColor: '#F7F8FA' },
  container: { flex: 1, backgroundColor: '#F7F8FA' },
  header: { paddingHorizontal: 20, paddingTop: 10 },
  headerRow: { flexDirection: 'row', alignItems: 'center', justifyContent: 'space-between' },
  backButton: { width: 32, height: 32, borderRadius: 16, alignItems: 'center', justifyContent: 'center', backgroundColor: '#E5E7EB' },
  headerTitle: { fontSize: 22, fontWeight: '800', color: '#1A1A1A' },
  subtitle: { marginTop: 6, fontSize: 12, color: '#6B7280' },
  summaryCard: {
    marginTop: 16,
    marginHorizontal: 20,
    backgroundColor: '#FFFFFF',
    borderRadius: 16,
    padding: 16,
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    shadowColor: '#000', shadowOpacity: 0.06, shadowRadius: 12, shadowOffset: { width: 0, height: 6 }, elevation: 3,
  },
  summaryLeft: { flexDirection: 'row', alignItems: 'center' },
  progressPill: { width: 120, height: 10, borderRadius: 999, backgroundColor: '#E5E7EB', overflow: 'hidden' },
  progressFill: { height: '100%', backgroundColor: Colors.light.accentGreen },
  progressText: { marginLeft: 12, fontWeight: '700', color: '#111827' },
  summaryRight: {},
  summaryItem: { fontSize: 12, color: '#6B7280' },
  summaryItemValue: { fontWeight: '800', color: '#111827' },
  dayCell: {
    width: cellSize,
    height: cellSize,
    borderRadius: 16,
    backgroundColor: '#FFFFFF',
    alignItems: 'center',
    justifyContent: 'center',
    shadowColor: '#000', shadowOpacity: 0.06, shadowRadius: 12, shadowOffset: { width: 0, height: 6 }, elevation: 3,
  },
  dayCellLocked: { backgroundColor: '#F3F4F6' },
  dayCellCompleted: { backgroundColor: '#ECFDF5', borderWidth: 1, borderColor: '#A7F3D0' },
  dayNumber: { fontWeight: '800', color: '#111827', fontSize: 16 },
  dayNumberLocked: { color: '#9CA3AF' },
  dayMinutes: { marginTop: 4, fontSize: 12, color: '#6B7280' },
  bottomBar: { padding: 20 },
  startButton: { backgroundColor: Colors.light.accentGreen, paddingVertical: 14, borderRadius: 999, alignItems: 'center' },
  startButtonText: { color: '#192126', fontWeight: '800', fontSize: 16 },
});