import { Ionicons } from '@expo/vector-icons';
import { useLocalSearchParams, useRouter } from 'expo-router';
import {
  ActivityIndicator,
  Pressable,
  ScrollView,
  StyleSheet,
  Switch,
  Text,
  View,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import { usePrivacyDetailSetting } from '../../../src/hooks';
import { colors } from '../../../src/theme';
import type { PrivacyDetailOption } from '../../../src/types';

/* ===================== 子组件：顶部导航 ===================== */

function Header({ title, onBack }: { title: string; 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} numberOfLines={1}>
        {title}
      </Text>
      <View style={styles.headerBtn} />
    </View>
  );
}

/* ===================== 子组件：可选项行 ===================== */

function OptionRow({
  item,
  disabled,
  isLast,
  onToggle,
}: {
  item: PrivacyDetailOption;
  disabled: boolean;
  isLast: boolean;
  onToggle: (id: string, enabled: boolean) => void;
}) {
  return (
    <View style={[styles.row, !isLast && styles.rowBorder]}>
      <View style={styles.rowBody}>
        <Text style={[styles.rowTitle, disabled && styles.rowTitleDisabled]}>{item.title}</Text>
        {item.description ? <Text style={styles.rowDesc}>{item.description}</Text> : null}
      </View>
      <Switch
        value={item.enabled}
        disabled={disabled}
        onValueChange={(next) => onToggle(item.id, next)}
        trackColor={{ false: colors.border, true: colors.primaryBorder }}
        thumbColor={item.enabled ? colors.primary : colors.white}
      />
    </View>
  );
}

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

export default function PrivacyDetailScreen() {
  const params = useLocalSearchParams();
  const rawId = params.id;
  const id = typeof rawId === 'string' ? rawId : Array.isArray(rawId) ? rawId[0] ?? '' : '';
  const router = useRouter();
  const { detail, loading, error, refresh, toggle } = usePrivacyDetailSetting(id);

  if (loading) {
    return (
      <SafeAreaView style={styles.safeArea} edges={['top']}>
        <Header title="隐私设置" onBack={() => router.back()} />
        <View style={styles.stateBox}>
          <ActivityIndicator size="large" color={colors.primary} />
        </View>
      </SafeAreaView>
    );
  }

  if (error || !detail) {
    return (
      <SafeAreaView style={styles.safeArea} edges={['top']}>
        <Header title="隐私设置" onBack={() => router.back()} />
        <View style={styles.stateBox}>
          <Ionicons name="alert-circle-outline" size={40} color={colors.danger} />
          <Text style={styles.stateText}>{detail === null ? '暂无该设置项' : '加载失败，请重试'}</Text>
          <Pressable style={styles.retryBtn} onPress={refresh}>
            <Text style={styles.retryText}>重试</Text>
          </Pressable>
        </View>
      </SafeAreaView>
    );
  }

  return (
    <SafeAreaView style={styles.safeArea} edges={['top', 'bottom']}>
      <Header title={detail.title} onBack={() => router.back()} />
      <ScrollView
        style={styles.scroll}
        contentContainerStyle={styles.content}
        showsVerticalScrollIndicator={false}
      >
        <View style={styles.introCard}>
          <Text style={styles.introText}>{detail.intro}</Text>
        </View>

        <View style={styles.section}>
          <Text style={styles.sectionTitle}>主开关</Text>
          <View style={styles.card}>
            <View style={styles.row}>
              <View style={styles.rowBody}>
                <Text style={styles.rowTitle}>{detail.master.title}</Text>
              </View>
              <Switch
                value={detail.master.enabled}
                onValueChange={(next) => toggle(detail.master.id, next)}
                trackColor={{ false: colors.border, true: colors.primaryBorder }}
                thumbColor={detail.master.enabled ? colors.primary : colors.white}
              />
            </View>
          </View>
        </View>

        <View style={styles.section}>
          <Text style={styles.sectionTitle}>细选项</Text>
          <View style={styles.card}>
            {detail.options.map((item, index) => (
              <OptionRow
                key={item.id}
                item={item}
                disabled={!detail.master.enabled}
                isLast={index === detail.options.length - 1}
                onToggle={toggle}
              />
            ))}
          </View>
        </View>

        {detail.note ? (
          <View style={styles.noteCard}>
            <Ionicons name="information-circle-outline" size={18} color={colors.info} />
            <Text style={styles.noteText}>{detail.note}</Text>
          </View>
        ) : null}
      </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: {
    flex: 1,
    textAlign: 'center',
    fontSize: 17,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  scroll: {
    flex: 1,
  },
  content: {
    padding: 8,
    paddingBottom: 24,
  },
  stateBox: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    gap: 12,
  },
  stateText: {
    marginTop: 12,
    fontSize: 14,
    color: colors.textSecondary,
  },
  retryBtn: {
    marginTop: 16,
    paddingHorizontal: 24,
    paddingVertical: 8,
    borderRadius: 18,
    backgroundColor: colors.primaryBtn,
  },
  retryText: {
    fontSize: 13,
    fontWeight: '600',
    color: colors.white,
  },
  introCard: {
    backgroundColor: colors.infoLight,
    borderRadius: 8,
    padding: 8,
    marginBottom: 8,
  },
  introText: {
    fontSize: 13,
    lineHeight: 19,
    color: colors.textSecondary,
  },
  section: {
    marginBottom: 16,
  },
  sectionTitle: {
    fontSize: 14,
    fontWeight: '700',
    color: colors.textPrimary,
    marginBottom: 10,
  },
  card: {
    backgroundColor: colors.white,
    borderRadius: 8,
    overflow: 'hidden',
  },
  row: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: 14,
    paddingVertical: 14,
  },
  rowBorder: {
    borderBottomWidth: 1,
    borderBottomColor: colors.borderLight,
  },
  rowBody: {
    flex: 1,
    marginRight: 12,
  },
  rowTitle: {
    fontSize: 15,
    fontWeight: '600',
    color: colors.textPrimary,
  },
  rowTitleDisabled: {
    color: colors.textHint,
  },
  rowDesc: {
    marginTop: 3,
    fontSize: 12,
    lineHeight: 16,
    color: colors.textSecondary,
  },
  noteCard: {
    flexDirection: 'row',
    alignItems: 'flex-start',
    backgroundColor: colors.white,
    borderRadius: 8,
    padding: 8,
    gap: 8,
  },
  noteText: {
    flex: 1,
    fontSize: 12,
    lineHeight: 18,
    color: colors.textSecondary,
  },
});