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

/* ===================== 子组件：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}>关于我们</Text>
      <View style={styles.headerBtn} />
    </View>
  );
}

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

export default function AboutScreen() {
  const router = useRouter();
  const { about, loading, error, refresh } = useAboutInfo();

  const handleLinkPress = (link: AboutLink) => {
    if (link.route) {
      router.push(link.route);
      return;
    }
    // 协议类页面待开发：仅占位，避免死路由
    console.log(`[AboutScreen] 待开发协议页: ${link.title}`);
  };

  return (
    <SafeAreaView style={styles.safeArea} edges={['top']}>
      <Header onBack={() => router.back()} />

      {loading ? (
        <View style={styles.stateBox}>
          <ActivityIndicator size="large" color={colors.primary} />
        </View>
      ) : error ? (
        <View style={styles.stateBox}>
          <Text style={styles.stateText}>加载失败，请重试</Text>
          <Pressable style={styles.retryBtn} onPress={refresh}>
            <Text style={styles.retryText}>重试</Text>
          </Pressable>
        </View>
      ) : !about ? (
        <View style={styles.stateBox}>
          <Ionicons name="information-circle-outline" size={48} color={colors.textHint} />
          <Text style={styles.stateText}>暂无应用信息</Text>
        </View>
      ) : (
        <ScrollView
          style={styles.scroll}
          contentContainerStyle={styles.content}
          showsVerticalScrollIndicator={false}
        >
          {/* 品牌区 */}
          <View style={styles.brandCard}>
            <View style={styles.brandLogo}>
              <Ionicons name="briefcase" size={34} color={colors.primary} />
            </View>
            <Text style={styles.appName}>{about.appName}</Text>
            <Text style={styles.version}>{about.version}</Text>
          </View>

          {/* 简介 */}
          <View style={styles.card}>
            <Text style={styles.cardTitle}>应用简介</Text>
            <Text style={styles.desc}>{about.description}</Text>
            <View style={styles.companyRow}>
              <Text style={styles.companyLabel}>运营主体</Text>
              <Text style={styles.companyValue}>{about.company}</Text>
            </View>
          </View>

          {/* 协议与链接 */}
          <View style={styles.card}>
            {about.links.map((link, index) => {
              const isLast = index === about.links.length - 1;
              return (
                <Pressable
                  key={link.id}
                  style={[styles.row, isLast && styles.rowLast]}
                  onPress={() => handleLinkPress(link)}
                  hitSlop={4}
                >
                  <Text style={styles.rowTitle}>{link.title}</Text>
                  <Ionicons name="chevron-forward" size={18} color={colors.textHint} />
                </Pressable>
              );
            })}
          </View>

          <Text style={styles.copyright}>
            Copyright © 2026 {about.company}
            {'\n'}All rights reserved.
          </Text>
        </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: 8,
    paddingBottom: 24,
  },
  brandCard: {
    alignItems: 'center',
    paddingVertical: 28,
    backgroundColor: colors.white,
    borderRadius: 8,
    marginBottom: 8,
  },
  brandLogo: {
    width: 72,
    height: 72,
    borderRadius: 36,
    backgroundColor: colors.primaryLight,
    alignItems: 'center',
    justifyContent: 'center',
    marginBottom: 12,
  },
  appName: {
    fontSize: 20,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  version: {
    marginTop: 4,
    fontSize: 13,
    color: colors.textSecondary,
  },
  card: {
    backgroundColor: colors.white,
    borderRadius: 8,
    paddingHorizontal: 14,
    paddingVertical: 14,
    marginBottom: 8,
  },
  cardTitle: {
    fontSize: 15,
    fontWeight: '700',
    color: colors.textPrimary,
    marginBottom: 8,
  },
  desc: {
    fontSize: 13,
    lineHeight: 20,
    color: colors.textSecondary,
  },
  companyRow: {
    flexDirection: 'row',
    alignItems: 'center',
    marginTop: 12,
    paddingTop: 12,
    borderTopWidth: 1,
    borderTopColor: colors.borderLight,
  },
  companyLabel: {
    fontSize: 13,
    color: colors.textSecondary,
    marginRight: 8,
  },
  companyValue: {
    flex: 1,
    fontSize: 13,
    fontWeight: '600',
    color: colors.textPrimary,
  },
  row: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingVertical: 14,
    borderBottomWidth: 1,
    borderBottomColor: colors.borderLight,
  },
  rowLast: {
    borderBottomWidth: 0,
  },
  rowTitle: {
    fontSize: 15,
    color: colors.textPrimary,
  },
  copyright: {
    marginTop: 20,
    fontSize: 12,
    lineHeight: 18,
    color: colors.textHint,
    textAlign: 'center',
  },
  stateBox: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
  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,
  },
});