import { Ionicons } from '@expo/vector-icons';
import { useRouter } from 'expo-router';
import { Image, Pressable, ScrollView, StyleSheet, Text, View } from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import { EmptyState, ErrorState, LoadingState } from '../../src/components/StateView';
import { useQualifications } from '../../src/hooks';
import { colors } from '../../src/theme';
import type { QualificationLicense } 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}>资质证照</Text>
      <View style={styles.headerBtn} />
    </View>
  );
}

/* ===================== 子组件：信息行 ===================== */

/**
 * 证照信息行。值为 `null`（信息尚未提供）时显示「待补充」，
 * 不使用 `--` 或空白 —— 空白会被误读成「本条不适用」，而实际是「还没填」。
 */
function InfoRow({ label, value }: { label: string; value: string | null }) {
  return (
    <View style={styles.infoRow}>
      <Text style={styles.infoLabel}>{label}</Text>
      {value ? (
        <Text style={styles.infoValue}>{value}</Text>
      ) : (
        <Text style={styles.infoPending}>待补充</Text>
      )}
    </View>
  );
}

/* ===================== 子组件：单张证照卡片 ===================== */

function LicenseCard({ license }: { license: QualificationLicense }) {
  return (
    <View style={styles.card}>
      <View style={styles.cardHeader}>
        <Ionicons name="ribbon-outline" size={18} color={colors.primaryDark} />
        <Text style={styles.cardTitle}>{license.name}</Text>
      </View>

      {/* 证照图：有图渲染图；没图渲染占位块，并写明这里需要补哪张图 */}
      {license.imageUrl ? (
        <Image source={{ uri: license.imageUrl }} style={styles.licenseImage} resizeMode="contain" />
      ) : (
        <View style={styles.imagePlaceholder}>
          <Ionicons name="image-outline" size={28} color={colors.actionText} />
          <Text style={styles.placeholderText}>{license.imagePlaceholder}</Text>
        </View>
      )}

      <View style={styles.infoList}>
        <InfoRow label={license.numberLabel} value={license.number} />
        <InfoRow label="发证机关" value={license.issuer} />
        <InfoRow label="有效期" value={license.validPeriod} />
        {license.scope ? <InfoRow label="经营范围" value={license.scope} /> : null}
      </View>
    </View>
  );
}

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

export default function QualificationsScreen() {
  const router = useRouter();
  const { info, loading, error, refresh, isEmpty } = useQualifications();

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

      {loading ? (
        <LoadingState text="证照信息加载中…" />
      ) : error ? (
        <ErrorState onRetry={refresh} />
      ) : !info || isEmpty ? (
        <EmptyState
          icon="ribbon-outline"
          title="暂无资质证照"
          subtitle="平台证照信息尚未公示，请稍后再试"
          actionLabel="重新加载"
          onAction={refresh}
        />
      ) : (
        <ScrollView
          style={styles.scroll}
          contentContainerStyle={styles.content}
          showsVerticalScrollIndicator={false}
        >
          {/* 运营主体 */}
          <View style={styles.companyCard}>
            <Text style={styles.companyLabel}>运营主体</Text>
            <Text style={styles.companyName}>{info.company}</Text>
            <Text style={styles.companyDesc}>
              以下证照为本平台经营所持有的资质文件，供求职者与招聘方核验。
            </Text>
          </View>

          {info.licenses.map((license) => (
            <LicenseCard key={license.id} license={license} />
          ))}

          <Text style={styles.verifyTip}>{info.verifyTip}</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: 12,
    paddingBottom: 32,
    gap: 12,
  },
  companyCard: {
    backgroundColor: colors.primaryLight,
    borderRadius: 8,
    borderWidth: 1,
    borderColor: colors.primaryBorder,
    padding: 16,
  },
  companyLabel: {
    fontSize: 12,
    color: colors.primaryText,
    opacity: 0.8,
  },
  companyName: {
    marginTop: 6,
    fontSize: 18,
    fontWeight: '700',
    color: colors.primaryText,
  },
  companyDesc: {
    marginTop: 8,
    fontSize: 13,
    lineHeight: 20,
    color: colors.primaryText,
    opacity: 0.85,
  },
  card: {
    backgroundColor: colors.surface,
    borderRadius: 8,
    borderWidth: 1,
    borderColor: colors.border,
    padding: 16,
  },
  cardHeader: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 6,
  },
  cardTitle: {
    fontSize: 16,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  licenseImage: {
    marginTop: 12,
    width: '100%',
    height: 180,
    borderRadius: 8,
    backgroundColor: colors.pageBg,
  },
  /* 图片占位：用「提醒卡片底 + 弱警示描边」语义色，一眼看出「这里是待办」 */
  imagePlaceholder: {
    marginTop: 12,
    height: 132,
    borderRadius: 8,
    borderWidth: 1,
    borderStyle: 'dashed',
    borderColor: colors.actionBorder,
    backgroundColor: colors.actionLight,
    alignItems: 'center',
    justifyContent: 'center',
    paddingHorizontal: 20,
    gap: 8,
  },
  placeholderText: {
    fontSize: 12,
    lineHeight: 18,
    color: colors.actionText,
    textAlign: 'center',
  },
  infoList: {
    marginTop: 12,
  },
  infoRow: {
    flexDirection: 'row',
    alignItems: 'flex-start',
    paddingVertical: 7,
    borderTopWidth: 1,
    borderTopColor: colors.borderLight,
  },
  /*
   * 标签列不写死宽度：原写 `width: 96` 时「统一社会信用代码」八个字折成两行，
   * 行高被撑开、右侧「待补充」位置错乱。改为按内容撑开（flexShrink: 0），
   * 再用 minWidth 让短标签（发证机关 / 有效期）与长标签左对齐。
   */
  infoLabel: {
    minWidth: 96,
    marginRight: 12,
    flexShrink: 0,
    fontSize: 13,
    color: colors.textSecondary,
  },
  infoValue: {
    flex: 1,
    fontSize: 13,
    fontWeight: '600',
    color: colors.textPrimary,
  },
  infoPending: {
    flex: 1,
    fontSize: 13,
    fontWeight: '600',
    color: colors.actionText,
  },
  verifyTip: {
    marginTop: 4,
    fontSize: 12,
    lineHeight: 18,
    color: colors.textHint,
    textAlign: 'center',
  },
});