import { Ionicons } from '@expo/vector-icons';
import { useRouter } from 'expo-router';
import { Pressable, ScrollView, StyleSheet, Text, View } from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import { useLegalData } 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 }: { plan: LegalPlan }) {
  return (
    <View style={[styles.planCard, plan.recommended && styles.planCardRecommended]}>
      {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>
  );
}

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

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

  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}
        >
          <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} />
            ))}
          </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,
  },
  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,
  },
});