import { Ionicons } from '@expo/vector-icons';
import { useRouter } from 'expo-router';
import { useState } from 'react';
import {
  ActivityIndicator,
  Pressable,
  ScrollView,
  StyleSheet,
  Text,
  View,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import { useIdentityOptions } from '../src/hooks';
import { useRole } from '../src/context/RoleContext';
import { useAuth } from '../src/context/AuthContext';
import { colors } from '../src/theme';
import type { IdentityOption } from '../src/types';

/* ===================== 子组件：顶部 Logo ===================== */

function LogoHeader() {
  return (
    <View style={styles.logoHeader}>
      <View style={styles.logoCircle}>
        <Text style={styles.logoText}>职</Text>
      </View>
      <Text style={styles.brandName}>职来</Text>
      <Text style={styles.brandSlogan}>智能求职 · 企业招聘一站式服务平台</Text>
    </View>
  );
}

/* ===================== 子组件：身份卡片 ===================== */

/**
 * 身份卡片：两张卡视觉重量保持一致（统一白底描边图标 + 主色线框），
 * 仅通过选中态的主题色底与描边区分，避免蓝/绿双色造成的重量不均衡。
 */
function IdentityCard({
  option,
  selected,
  onSelect,
}: {
  option: IdentityOption;
  selected: boolean;
  onSelect: () => void;
}) {
  return (
    <Pressable
      style={[styles.card, selected && styles.cardSelected]}
      onPress={onSelect}
      hitSlop={4}
    >
      <View
        style={[
          styles.iconWrap,
          { backgroundColor: selected ? colors.primaryLight : colors.white },
          selected && { borderColor: colors.primaryBorder },
        ]}
      >
        <Ionicons
          name={option.icon as keyof typeof Ionicons.glyphMap}
          size={28}
          color={colors.primary}
        />
      </View>
      <Text style={[styles.cardTitle, selected && styles.cardTitleSelected]}>{option.title}</Text>
      <Text style={styles.cardDesc}>{option.desc}</Text>
      {selected && (
        <View style={styles.check}>
          <Ionicons name="checkmark-circle" size={22} color={colors.primary} />
        </View>
      )}
    </Pressable>
  );
}

/* ===================== 子组件：四态 ===================== */

function Loading() {
  return (
    <View style={styles.center}>
      <ActivityIndicator size="large" color={colors.primary} />
      <Text style={styles.tip}>正在加载…</Text>
    </View>
  );
}

function ErrorState({ onRetry }: { onRetry: () => void }) {
  return (
    <View style={styles.center}>
      <Ionicons name="swap-horizontal-outline" size={40} color={colors.textHint} />
      <Text style={styles.tip}>加载失败</Text>
      <Pressable style={styles.retryBtn} onPress={onRetry} hitSlop={6}>
        <Text style={styles.retryText}>点击重试</Text>
      </Pressable>
    </View>
  );
}

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

export default function IdentitySelectScreen() {
  const router = useRouter();
  const { setRole } = useRole();
  const { candidateSetupDone, enterpriseVerified } = useAuth();
  const { options, loading, error, refresh } = useIdentityOptions();
  const [selectedId, setSelectedId] = useState<string | null>(null);

  /**
   * 选中身份即进入：先写 role，再进入该身份的下一步（避免点到卡片无反应）。
   * - 求职者：未设置求职意向 → 求职意向页；已设置 → 求职端
   * - 招聘者：未完成企业认证 → 企业认证页；已完成 → 企业端
   * 注意：两个路由组均无 index，故一律用显式落地路由。
   */
  const handleSelect = (option: IdentityOption) => {
    setSelectedId(option.id);
    if (option.role === 'candidate') {
      setRole('candidate');
      router.replace(candidateSetupDone ? '/(tabs)/jobs' : '/job-preference');
    } else {
      setRole('enterprise');
      router.replace(
        enterpriseVerified ? '/(enterprise)/job-management' : '/enterprise-certification',
      );
    }
  };

  return (
    <SafeAreaView style={styles.container} edges={['bottom']}>
      <ScrollView contentContainerStyle={styles.body} showsVerticalScrollIndicator={false}>
        <LogoHeader />

        {loading ? (
          <Loading />
        ) : error ? (
          <ErrorState onRetry={refresh} />
        ) : (
          <>
            <View style={styles.cards}>
              {options.map((opt) => (
                <IdentityCard
                  key={opt.id}
                  option={opt}
                  selected={opt.id === selectedId}
                  onSelect={() => handleSelect(opt)}
                />
              ))}
            </View>

            <Text style={styles.hint}>点击上方卡片，进入对应身份页面</Text>
            <Text style={styles.switchTip}>身份后续可在设置中切换</Text>
          </>
        )}
      </ScrollView>
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  container: { flex: 1, backgroundColor: colors.pageBg },
  body: { flexGrow: 1, padding: 20, paddingTop: 28 },
  logoHeader: { alignItems: 'center', marginBottom: 32 },
  logoCircle: {
    width: 72,
    height: 72,
    borderRadius: 36,
    backgroundColor: colors.primary,
    alignItems: 'center',
    justifyContent: 'center',
    marginBottom: 12,
  },
  logoText: { fontSize: 32, fontWeight: '800', color: colors.textInverse },
  brandName: { fontSize: 24, fontWeight: '800', color: colors.textPrimary },
  brandSlogan: { fontSize: 13, color: colors.textSecondary, marginTop: 6 },
  cards: { flexDirection: 'row', gap: 16, marginBottom: 20 },
  card: {
    flex: 1,
    position: 'relative',
    backgroundColor: colors.white,
    borderRadius: 16,
    padding: 16,
    borderWidth: 1.5,
    borderColor: colors.borderLight,
  },
  cardSelected: { borderColor: colors.primary, backgroundColor: colors.primaryLight },
  iconWrap: {
    width: 52,
    height: 52,
    borderRadius: 14,
    alignItems: 'center',
    justifyContent: 'center',
    marginBottom: 12,
    borderWidth: 1,
    borderColor: colors.borderLight,
  },
  cardTitle: { fontSize: 16, fontWeight: '700', color: colors.textPrimary },
  cardTitleSelected: { color: colors.primaryText },
  cardDesc: { fontSize: 12, color: colors.textSecondary, marginTop: 6, lineHeight: 18 },
  check: { position: 'absolute', top: 12, right: 12 },
  hint: {
    marginTop: 8,
    fontSize: 13,
    color: colors.textHint,
    textAlign: 'center',
  },
  switchTip: {
    marginTop: 6,
    fontSize: 12,
    color: colors.textHint,
    textAlign: 'center',
  },
  center: { flex: 1, alignItems: 'center', justifyContent: 'center', paddingHorizontal: 40, gap: 12 },
  tip: { fontSize: 14, color: colors.textSecondary },
  retryBtn: { paddingHorizontal: 18, paddingVertical: 8, borderRadius: 16, backgroundColor: colors.primaryLight },
  retryText: { fontSize: 13, fontWeight: '600', color: colors.primaryText },
});