import type { FastingPlan } from '@/constants/Fasting';
import { Colors } from '@/constants/Colors';
import { IconSymbol } from '@/components/ui/IconSymbol';
import { useColorScheme } from '@/hooks/useColorScheme';
import React, { useMemo } from 'react';
import {
  ScrollView,
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
} from 'react-native';

type FastingPlanListProps = {
  plans: FastingPlan[];
  activePlanId?: string | null;
  onSelectPlan: (plan: FastingPlan) => void;
};

const difficultyLabel: Record<FastingPlan['difficulty'], string> = {
  新手: '适合入门',
  进阶: '脂代提升',
  强化: '平台突破',
};

export function FastingPlanList({ plans, activePlanId, onSelectPlan }: FastingPlanListProps) {
  const theme = useColorScheme() ?? 'light';
  const colors = Colors[theme];

  const sortedPlans = useMemo(
    () => plans.slice().sort((a, b) => a.fastingHours - b.fastingHours),
    [plans]
  );

  return (
    <View style={styles.wrapper}>
      <View style={styles.headerRow}>
        <Text style={styles.headerTitle}>单日计划</Text>
        <View style={styles.headerBadge}>
          <Text style={styles.headerBadgeText}>精选</Text>
        </View>
      </View>
      <ScrollView
        horizontal
        showsHorizontalScrollIndicator={false}
        contentContainerStyle={styles.scrollContent}
      >
        {sortedPlans.map((plan) => {
          const isActive = plan.id === activePlanId;
          return (
            <TouchableOpacity
              key={plan.id}
              style={[
                styles.card,
                {
                  backgroundColor: plan.theme.backdrop,
                  borderColor: isActive ? plan.theme.accent : 'transparent',
                },
              ]}
              activeOpacity={0.85}
              onPress={() => onSelectPlan(plan)}
            >
              <View style={styles.cardTopRow}>
                <View style={[styles.difficultyPill, { backgroundColor: `${plan.theme.accent}1A` }]}>
                  <Text style={[styles.difficultyText, { color: plan.theme.accent }]}>
                    {plan.difficulty}
                  </Text>
                </View>
                {plan.badge && (
                  <View style={[styles.badgePill, { backgroundColor: `${plan.theme.accent}26` }]}>
                    <Text style={[styles.badgeText, { color: plan.theme.accent }]}>
                      {plan.badge}
                    </Text>
                  </View>
                )}
              </View>
              <Text style={styles.cardTitle}>{plan.title}</Text>
              <Text style={styles.cardSubtitle}>{plan.subtitle}</Text>
              <View style={styles.metaRow}>
                <View style={styles.metaItem}>
                  <IconSymbol name="chart.pie.fill" color={colors.icon} size={16} />
                  <Text style={styles.metaText}>{plan.fastingHours} 小时断食</Text>
                </View>
                <View style={styles.metaItem}>
                  <IconSymbol name="flag.fill" color={colors.icon} size={16} />
                  <Text style={styles.metaText}>{difficultyLabel[plan.difficulty]}</Text>
                </View>
              </View>
            </TouchableOpacity>
          );
        })}
      </ScrollView>
    </View>
  );
}

const styles = StyleSheet.create({
  wrapper: {
    marginTop: 32,
  },
  headerRow: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    marginBottom: 12,
    paddingHorizontal: 4,
  },
  headerTitle: {
    fontSize: 18,
    fontWeight: '700',
    color: '#2E3142',
  },
  headerBadge: {
    paddingHorizontal: 12,
    paddingVertical: 6,
    borderRadius: 14,
    backgroundColor: 'rgba(53, 52, 69, 0.08)',
  },
  headerBadgeText: {
    fontSize: 12,
    fontWeight: '600',
    color: '#353445',
  },
  scrollContent: {
    paddingRight: 20,
  },
  card: {
    width: 220,
    borderRadius: 24,
    paddingVertical: 18,
    paddingHorizontal: 18,
    marginRight: 16,
    borderWidth: 2,
  },
  cardTopRow: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    marginBottom: 12,
  },
  difficultyPill: {
    paddingHorizontal: 12,
    paddingVertical: 6,
    borderRadius: 16,
  },
  difficultyText: {
    fontSize: 12,
    fontWeight: '600',
  },
  badgePill: {
    paddingHorizontal: 10,
    paddingVertical: 6,
    borderRadius: 14,
  },
  badgeText: {
    fontSize: 11,
    fontWeight: '600',
  },
  cardTitle: {
    fontSize: 16,
    fontWeight: '700',
    color: '#2E3142',
    marginBottom: 6,
  },
  cardSubtitle: {
    fontSize: 13,
    fontWeight: '500',
    color: '#5B6572',
    marginBottom: 12,
  },
  metaRow: {
    marginTop: 'auto',
  },
  metaItem: {
    flexDirection: 'row',
    alignItems: 'center',
    marginBottom: 6,
  },
  metaText: {
    marginLeft: 6,
    fontSize: 12,
    color: '#5B6572',
    fontWeight: '500',
  },
});