import { Ionicons } from '@expo/vector-icons';
import { useRouter } from 'expo-router';
import { Alert, 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 { LegalTemplate } 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}>文书模板</Text>
      <View style={styles.headerBtn} />
    </View>
  );
}

/* ===================== 模板卡片 ===================== */

function TemplateCard({ template, onPress }: { template: LegalTemplate; onPress: () => void }) {
  return (
    <Pressable style={styles.templateCard} onPress={onPress}>
      <Ionicons name={template.icon as never} size={22} color={colors.primary} />
      <View style={styles.templateBody}>
        <Text style={styles.templateName}>{template.name}</Text>
        <Text style={styles.templateDesc}>{template.description}</Text>
      </View>
      <Ionicons name="chevron-forward" size={18} color={colors.textHint} />
    </Pressable>
  );
}

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

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

  return (
    <SafeAreaView style={styles.safeArea} edges={['top']}>
      <Header onBack={() => router.back()} />
      {loading ? (
        <LoadingState text="加载模板中…" />
      ) : error ? (
        <ErrorState message="加载失败，请重试" onRetry={refresh} />
      ) : templates.length === 0 ? (
        <EmptyState icon="document-text-outline" title="暂无文书模板" subtitle="如有疑问，可前往法律咨询" />
      ) : (
        <ScrollView
          style={styles.scroll}
          contentContainerStyle={styles.content}
          showsVerticalScrollIndicator={false}
        >
          <View style={styles.templateGrid}>
            {templates.map((template) => (
              <TemplateCard
                key={template.id}
                template={template}
                onPress={() =>
                  Alert.alert('文书预览', `「${template.name}」预览与下载功能即将上线`)
                }
              />
            ))}
          </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,
  },
  templateGrid: {
    gap: 8,
  },
  templateCard: {
    flexDirection: 'row',
    alignItems: 'center',
    padding: 12,
    borderRadius: 8,
    backgroundColor: colors.white,
  },
  templateBody: {
    flex: 1,
    marginLeft: 12,
    marginRight: 8,
  },
  templateName: {
    fontSize: 14,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  templateDesc: {
    marginTop: 2,
    fontSize: 12,
    color: colors.textSecondary,
  },
});