import { Ionicons } from '@expo/vector-icons';
import { useFocusEffect, useRouter } from 'expo-router';
import { useCallback } from 'react';
import { Pressable, ScrollView, StyleSheet, Text, View } from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import { useLegalData, useLegalMembership } from '../../src/hooks';
import { LoadingState, ErrorState, EmptyState } from '../../src/components/StateView';
import { colors } from '../../src/theme';
import type { LegalPlan } from '../../src/types';

/* ===================== 顶部导航 ===================== */

function Header({ onBack }: { onBack: () => void }) {
  return (
    <View style={styles.header}>
      <Pressable style={styles.headerBtn} onPress={onBack} hitSlop={8}>
        <Ionicons name="chevron-back" size={24} color={colors.textPrimary} />
      </Pressable>
      <Text style={styles.headerTitle}>开通会员</Text>
      <View style={styles.headerBtn} />
    </View>
  );
}

/* ===================== 套餐卡片 ===================== */

function PlanCard({ plan, onPress }: { plan: LegalPlan; onPress?: () => void }) {
  return (
    <Pressable
      style={({ pressed }) => [
        styles.planCard,
        plan.recommended && styles.planCardRecommended,
        pressed && styles.planPressed,
      ]}
      onPress={onPress}
      disabled={!onPress}
    >
      {plan.recommended && (
        <View style={styles.recommendedTag}>
          <Text style={styles.recommendedText}>推荐</Text>
        </View>
      )}
      <Text style={styles.planName}>{plan.name}</Text>
      <View style={styles.planPriceRow}>
        <Text style={styles.planCurrency}>¥</Text>
        <Text style={styles.planPrice}>{plan.price}</Text>
        <Text style={styles.planPeriod}>{plan.period}</Text>
      </View>
      <View style={styles.benefits}>
        {plan.benefits.map((benefit, idx) => (
          <View key={idx} style={styles.benefitRow}>
            <Ionicons name="checkmark-circle" size={14} color={colors.success} />
            <Text style={styles.benefitText}>{benefit}</Text>
          </View>
        ))}
      </View>
      <View style={styles.planCtaRow}>
        <Text style={styles.planCtaText}>立即开通</Text>
        <Ionicons name="chevron-forward" size={16} color={colors.action} />
      </View>
    </Pressable>
  );
}

/* ===================== 页面 ===================== */

export default function LegalUpgradeScreen() {
  const router = useRouter();
  const { plans, loading, error, refresh } = useLegalData();
  const { membership, refresh: refreshMembership } = useLegalMembership();

  useFocusEffect(
    useCallback(() => {
      refreshMembership();
    }, [refreshMembership]),
  );

  const formatDate = (iso: string) => new Date(iso).toLocaleDateString('zh-CN');

  return (
    <SafeAreaView style={styles.safeArea} edges={['top']}>
      <Header onBack={() => router.back()} />
      {loading ? (
        <LoadingState text="加载套餐中…" />
      ) : error ? (
        <ErrorState message="加载失败，请重试" onRetry={refresh} />
      ) : plans.length === 0 ? (
        <EmptyState icon="card-outline" title="暂无会员套餐" subtitle="如有疑问，可前往法律咨询" />
      ) : (
        <ScrollView
          style={styles.scroll}
          contentContainerStyle={styles.content}
          showsVerticalScrollIndicator={false}
        >
          {membership ? (
            <View style={styles.memberBanner}>
              <Ionicons name="shield-checkmark" size={16} color={colors.action} />
              <Text style={styles.memberBannerText}>
                您已开通{membership.planName}，有效期至 {formatDate(membership.expiresAt)}
              </Text>
            </View>
          ) : (
            <Text style={styles.tip}>开通会员后可享受律师咨询、合同审核等专属法律服务</Text>
          )}
          <View style={styles.planGrid}>
            {plans.map((plan) => (
              <PlanCard
                key={plan.id}
                plan={plan}
                onPress={() => router.push(`/legal/checkout?planId=${plan.id}`)}
              />
            ))}
          </View>
        </ScrollView>
      )}
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  safeArea: {
    flex: 1,
    backgroundColor: colors.pageBg,
  },
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: 8,
    height: 48,
    backgroundColor: colors.white,
    borderBottomWidth: 1,
    borderBottomColor: colors.borderLight,
  },
  headerBtn: {
    width: 40,
    height: 40,
    alignItems: 'center',
    justifyContent: 'center',
  },
  headerTitle: {
    fontSize: 17,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  scroll: {
    flex: 1,
  },
  content: {
    padding: 12,
    paddingBottom: 24,
  },
  tip: {
    fontSize: 13,
    color: colors.textSecondary,
    marginBottom: 12,
  },
  planGrid: {
    gap: 12,
  },
  planCard: {
    padding: 14,
    borderRadius: 8,
    backgroundColor: colors.white,
    borderWidth: 1,
    borderColor: colors.border,
  },
  planPressed: {
    opacity: 0.85,
  },
  planCtaRow: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'flex-end',
    marginTop: 12,
    gap: 2,
  },
  planCtaText: {
    fontSize: 13,
    fontWeight: '700',
    color: colors.action,
  },
  memberBanner: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 6,
    paddingHorizontal: 12,
    paddingVertical: 10,
    borderRadius: 8,
    backgroundColor: colors.actionLight,
    borderWidth: 1,
    borderColor: colors.action,
    marginBottom: 12,
  },
  memberBannerText: {
    flex: 1,
    fontSize: 13,
    fontWeight: '600',
    color: colors.actionText,
  },
  planCardRecommended: {
    borderColor: colors.action,
    backgroundColor: colors.actionLight,
  },
  recommendedTag: {
    alignSelf: 'flex-start',
    paddingHorizontal: 6,
    paddingVertical: 2,
    borderRadius: 4,
    backgroundColor: colors.action,
    marginBottom: 8,
  },
  recommendedText: {
    fontSize: 10,
    fontWeight: '700',
    color: colors.white,
  },
  planName: {
    fontSize: 15,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  planPriceRow: {
    flexDirection: 'row',
    alignItems: 'baseline',
    marginTop: 8,
    marginBottom: 10,
  },
  planCurrency: {
    fontSize: 14,
    fontWeight: '700',
    color: colors.actionText,
  },
  planPrice: {
    fontSize: 28,
    fontWeight: '700',
    color: colors.actionText,
  },
  planPeriod: {
    fontSize: 13,
    color: colors.textSecondary,
  },
  benefits: {
    gap: 6,
  },
  benefitRow: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 6,
  },
  benefitText: {
    fontSize: 12,
    color: colors.textSecondary,
  },
});