import { Ionicons } from '@expo/vector-icons';
import { useRouter } from 'expo-router';
import { useState } from 'react';
import {
  ActivityIndicator,
  Pressable,
  ScrollView,
  StyleSheet,
  Text,
  TextInput,
  View,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import { useEnterpriseCertification } from '../src/hooks';
import { useAuth } from '../src/context/AuthContext';
import { colors } from '../src/theme';
import type { EnterpriseCertificationForm, EnterpriseCertificationStatus } 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}>企业认证</Text>
      <View style={styles.headerBtn} />
    </View>
  );
}

/* ===================== 子组件：状态徽章 ===================== */

function StatusBadge({ status }: { status: EnterpriseCertificationStatus }) {
  const map: Record<EnterpriseCertificationStatus, { text: string; bg: string; color: string }> = {
    unverified: { text: '未认证', bg: colors.borderLight, color: colors.textSecondary },
    pending: { text: '审核中', bg: colors.primaryLight, color: colors.primaryText },
    verified: { text: '已认证', bg: colors.successLight, color: colors.successText },
    rejected: { text: '未通过', bg: colors.dangerLight, color: colors.dangerText },
  };
  const theme = map[status];
  return (
    <View style={[styles.statusBadge, { backgroundColor: theme.bg }]}>
      <Text style={[styles.statusText, { color: theme.color }]}>{theme.text}</Text>
    </View>
  );
}

/* ===================== 子组件：输入框 ===================== */

function Field({
  label,
  required,
  value,
  placeholder,
  onChange,
  keyboardType = 'default',
  maxLength,
}: {
  label: string;
  required?: boolean;
  value: string;
  placeholder: string;
  onChange: (v: string) => void;
  keyboardType?: 'default' | 'number-pad' | 'phone-pad';
  maxLength?: number;
}) {
  return (
    <View style={styles.field}>
      <Text style={styles.fieldLabel}>
        {label}
        {required ? <Text style={styles.required}> *</Text> : null}
      </Text>
      <TextInput
        style={styles.fieldInput}
        value={value}
        placeholder={placeholder}
        placeholderTextColor={colors.textHint}
        onChangeText={onChange}
        keyboardType={keyboardType}
        maxLength={maxLength}
      />
    </View>
  );
}

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

export default function EnterpriseCertificationScreen() {
  const router = useRouter();
  const { completeEnterpriseVerify } = useAuth();
  const { certification, loading, error, refresh, submitting, submit, status } = useEnterpriseCertification();
  const [form, setForm] = useState<EnterpriseCertificationForm>({
    companyName: '',
    creditCode: '',
    contactName: '',
    contactPhone: '',
  });

  if (loading || !certification) {
    return (
      <SafeAreaView style={styles.safeArea} edges={['top']}>
        <Header onBack={() => router.back()} />
        <View style={styles.center}>
          <ActivityIndicator size="large" color={colors.primary} />
        </View>
      </SafeAreaView>
    );
  }

  if (error) {
    return (
      <SafeAreaView style={styles.safeArea} edges={['top']}>
        <Header onBack={() => router.back()} />
        <View style={styles.center}>
          <Text style={styles.tip}>加载失败</Text>
          <Pressable style={styles.retryBtn} onPress={refresh}>
            <Text style={styles.retryText}>重试</Text>
          </Pressable>
        </View>
      </SafeAreaView>
    );
  }

  const currentStatus = status ?? certification.status;
  const isVerified = currentStatus === 'verified';
  const isPending = currentStatus === 'pending';

  const updateField = <K extends keyof EnterpriseCertificationForm>(field: K, value: EnterpriseCertificationForm[K]) => {
    setForm((prev) => ({ ...prev, [field]: value }));
  };

  const handleSubmit = async () => {
    if (!form.companyName || !form.creditCode || !form.contactName || !form.contactPhone) return;
    await submit(form);
    // 提交即视为走完「企业认证」必经步骤，标记后进入企业端（审核中也可浏览）
    completeEnterpriseVerify();
    router.replace('/(enterprise)/job-management');
  };

  const handleSkip = () => {
    // 允许稍后认证：标记步骤已完成，先进企业端
    completeEnterpriseVerify();
    router.replace('/(enterprise)/job-management');
  };

  return (
    <SafeAreaView style={styles.safeArea} edges={['top']}>
      <Header onBack={() => router.back()} />
      <ScrollView style={styles.scroll} showsVerticalScrollIndicator={false}>
        {/* 顶部认证说明 */}
        <View style={styles.topCard}>
          <View style={styles.topHeader}>
            <View style={styles.shieldWrap}>
              <Ionicons name="shield-checkmark" size={28} color={colors.textInverse} />
            </View>
            <View style={styles.topTitleWrap}>
              <Text style={styles.topTitle}>企业认证</Text>
              <StatusBadge status={currentStatus} />
            </View>
          </View>
          <Text style={styles.topDesc}>认证后可享受</Text>
          <View style={styles.benefits}>
            {certification.benefits.map((b) => (
              <View key={b.id} style={styles.benefitRow}>
                <Ionicons name="checkmark-circle" size={16} color={colors.success} />
                <Text style={styles.benefitText}>{b.text}</Text>
              </View>
            ))}
          </View>
        </View>

        {/* 表单 */}
        {isVerified ? (
          <View style={styles.successCard}>
            <Ionicons name="checkmark-circle-outline" size={48} color={colors.success} />
            <Text style={styles.successTitle}>企业认证已通过</Text>
            <Text style={styles.successDesc}>您已进入企业端，可发布岗位并管理招聘流程</Text>
            <Pressable style={styles.successBtn} onPress={() => router.replace('/(enterprise)/job-management')}>
              <Text style={styles.successBtnText}>进入企业端</Text>
            </Pressable>
          </View>
        ) : isPending ? (
          <View style={styles.pendingCard}>
            <Ionicons name="time-outline" size={48} color={colors.primary} />
            <Text style={styles.pendingTitle}>认证审核中</Text>
            <Text style={styles.pendingDesc}>我们将在 1-3 个工作日内完成审核，请耐心等待</Text>
          </View>
        ) : (
          <View style={styles.formCard}>
            <Text style={styles.formTitle}>填写企业信息</Text>
            <Field
              label="企业名称"
              required
              value={form.companyName}
              placeholder="请输入企业全称"
              onChange={(v) => updateField('companyName', v)}
            />
            <Field
              label="统一社会信用代码"
              required
              value={form.creditCode}
              placeholder="请输入18位统一社会信用代码"
              onChange={(v) => updateField('creditCode', v)}
              maxLength={18}
            />
            <Field
              label="联系人姓名"
              required
              value={form.contactName}
              placeholder="请输入联系人姓名"
              onChange={(v) => updateField('contactName', v)}
            />
            <Field
              label="联系人手机号"
              required
              value={form.contactPhone}
              placeholder="请输入联系人手机号"
              onChange={(v) => updateField('contactPhone', v)}
              keyboardType="phone-pad"
              maxLength={11}
            />
            <Pressable
              style={[styles.submitBtn, submitting && styles.submitBtnDisabled]}
              onPress={handleSubmit}
              disabled={submitting}
            >
              <Text style={styles.submitBtnText}>{submitting ? '提交中…' : '提交认证'}</Text>
            </Pressable>
            <Pressable
              style={{ alignItems: 'center', paddingVertical: 14 }}
              onPress={handleSkip}
              hitSlop={6}
            >
              <Text style={{ fontSize: 14, color: colors.textHint }}>稍后认证</Text>
            </Pressable>
          </View>
        )}
        <View style={styles.bottomPad} />
      </ScrollView>
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  safeArea: { flex: 1, backgroundColor: colors.pageBg },
  header: {
    height: 44,
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: 8,
    backgroundColor: colors.white,
  },
  headerBtn: { width: 36, height: 36, alignItems: 'center', justifyContent: 'center' },
  headerTitle: { fontSize: 17, fontWeight: '700', color: colors.textPrimary },
  scroll: { flex: 1 },
  center: { flex: 1, alignItems: 'center', justifyContent: 'center' },
  tip: { fontSize: 14, color: colors.textSecondary },
  retryBtn: {
    marginTop: 12,
    paddingHorizontal: 18,
    paddingVertical: 8,
    borderRadius: 16,
    backgroundColor: colors.primaryLight,
  },
  retryText: { fontSize: 13, fontWeight: '600', color: colors.primaryText },
  topCard: {
    margin: 12,
    backgroundColor: colors.primary,
    borderRadius: 16,
    padding: 20,
  },
  topHeader: { flexDirection: 'row', alignItems: 'center', marginBottom: 16 },
  shieldWrap: {
    width: 48,
    height: 48,
    borderRadius: 24,
    backgroundColor: colors.onBrandSurface,
    alignItems: 'center',
    justifyContent: 'center',
  },
  topTitleWrap: { flex: 1, marginLeft: 14 },
  topTitle: { fontSize: 20, fontWeight: '800', color: colors.textInverse },
  topDesc: { fontSize: 14, color: colors.textInverse, opacity: 0.85, marginBottom: 12 },
  benefits: { gap: 8 },
  benefitRow: { flexDirection: 'row', alignItems: 'center' },
  benefitText: { marginLeft: 8, fontSize: 13, color: colors.textInverse, opacity: 0.9 },
  statusBadge: {
    alignSelf: 'flex-start',
    marginTop: 6,
    paddingHorizontal: 8,
    paddingVertical: 2,
    borderRadius: 10,
  },
  statusText: { fontSize: 11, fontWeight: '600' },
  formCard: {
    marginHorizontal: 12,
    backgroundColor: colors.white,
    borderRadius: 16,
    padding: 20,
  },
  formTitle: { fontSize: 16, fontWeight: '700', color: colors.textPrimary, marginBottom: 16 },
  field: { marginBottom: 16 },
  fieldLabel: { fontSize: 14, fontWeight: '500', color: colors.textPrimary, marginBottom: 8 },
  required: { color: colors.danger },
  fieldInput: {
    height: 46,
    borderWidth: 1,
    borderColor: colors.border,
    borderRadius: 10,
    paddingHorizontal: 14,
    fontSize: 14,
    color: colors.textPrimary,
  },
  submitBtn: {
    marginTop: 8,
    backgroundColor: colors.primaryBtn,
    borderRadius: 12,
    paddingVertical: 14,
    alignItems: 'center',
  },
  submitBtnDisabled: { opacity: 0.6 },
  submitBtnText: { fontSize: 16, fontWeight: '700', color: colors.textInverse },
  successCard: {
    marginHorizontal: 12,
    backgroundColor: colors.white,
    borderRadius: 16,
    padding: 32,
    alignItems: 'center',
  },
  successTitle: { fontSize: 18, fontWeight: '700', color: colors.textPrimary, marginTop: 16 },
  successDesc: { fontSize: 13, color: colors.textSecondary, marginTop: 8, textAlign: 'center' },
  successBtn: {
    marginTop: 24,
    backgroundColor: colors.successBtn,
    borderRadius: 12,
    paddingHorizontal: 32,
    paddingVertical: 12,
  },
  successBtnText: { fontSize: 15, fontWeight: '700', color: colors.textInverse },
  pendingCard: {
    marginHorizontal: 12,
    backgroundColor: colors.white,
    borderRadius: 16,
    padding: 32,
    alignItems: 'center',
  },
  pendingTitle: { fontSize: 18, fontWeight: '700', color: colors.textPrimary, marginTop: 16 },
  pendingDesc: { fontSize: 13, color: colors.textSecondary, marginTop: 8, textAlign: 'center' },
  bottomPad: { height: 24 },
});