import { Ionicons } from '@expo/vector-icons';
import { useRouter } from 'expo-router';
import { useMemo, useState } from 'react';
import {
  ActivityIndicator,
  Alert,
  Pressable,
  ScrollView,
  StyleSheet,
  Text,
  TextInput,
  View,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import { useJobManagement } from '../../src/hooks';
import { colors } from '../../src/theme';
import type { JobManagement, JobManagementJob, JobManagementTab } from '../../src/types';

/* ===================== 子组件：顶部导航 ===================== */

function Header({ companyName, onBack }: { companyName: string; onBack: () => void }) {
  const router = useRouter();
  return (
    <View style={styles.header}>
      <Pressable style={styles.headerBtn} onPress={onBack} hitSlop={8}>
        <Ionicons name="chevron-back" size={24} color={colors.textPrimary} />
      </Pressable>
      <View style={styles.headerCenter}>
        <Text style={styles.headerCompany}>{companyName}</Text>
        <Text style={styles.headerTitle}>岗位管理</Text>
      </View>
      <Pressable
        style={styles.publishBtn}
        onPress={() => router.push('/job-publish')}
        hitSlop={6}
      >
        <Ionicons name="add" size={16} color={colors.white} />
        <Text style={styles.publishBtnText}>发布</Text>
      </Pressable>
    </View>
  );
}

/* ===================== 子组件：Tab 栏 ===================== */

function TabBar({
  tabs,
  active,
  onChange,
}: {
  tabs: JobManagementTab[];
  active: string;
  onChange: (key: string) => void;
}) {
  return (
    <View style={styles.tabBar}>
      {tabs.map((tab) => {
        const isActive = tab.key === active;
        return (
          <Pressable key={tab.key} style={styles.tabItem} onPress={() => onChange(tab.key)}>
            <Text style={[styles.tabLabel, isActive && styles.tabLabelActive]}>
              {tab.label}
              <Text style={[styles.tabCount, isActive && styles.tabCountActive]}>({tab.count})</Text>
            </Text>
            <View style={[styles.tabIndicator, isActive && styles.tabIndicatorActive]} />
          </Pressable>
        );
      })}
    </View>
  );
}

/* ===================== 子组件：数据概览 ===================== */

function StatsOverview({ stats }: { stats: JobManagement['stats'] }) {
  return (
    <View style={styles.statsGrid}>
      {stats.map((stat) => {
        const token = stat.color === 'success'
          ? colors.success
          : stat.color === 'action'
            ? colors.action
            : stat.color === 'info'
              ? colors.info
              : colors.primary;
        const isUp = stat.change.startsWith('+');
        const isDown = stat.change.startsWith('-');
        const changeColor = isUp ? colors.success : isDown ? colors.action : colors.textSecondary;
        return (
          <View key={stat.id} style={styles.statCard}>
            <View style={[styles.statIconWrap, { backgroundColor: token + '15' }]}>
              <Ionicons name={stat.icon as keyof typeof Ionicons.glyphMap} size={22} color={token} />
            </View>
            <View style={styles.statBody}>
              <Text style={styles.statValue}>{stat.value}</Text>
              <Text style={styles.statLabel}>{stat.label}</Text>
            </View>
            <View style={styles.statChangeWrap}>
              <Text style={[styles.statChange, { color: changeColor }]}>{stat.change}</Text>
            </View>
          </View>
        );
      })}
    </View>
  );
}

/* ===================== 子组件：搜索与筛选 ===================== */

function SearchFilterBar() {
  return (
    <View style={styles.searchBar}>
      <View style={styles.searchInputWrap}>
        <Ionicons name="search-outline" size={18} color={colors.textHint} />
        <TextInput
          style={styles.searchInput}
          placeholder="搜索岗位名称..."
          placeholderTextColor={colors.textHint}
        />
      </View>
      <Pressable style={styles.filterBtn} onPress={() => Alert.alert('筛选', '岗位筛选功能开发中，敬请期待')}>
        <Ionicons name="funnel-outline" size={18} color={colors.textPrimary} />
        <Text style={styles.filterBtnText}>筛选</Text>
      </Pressable>
      <Pressable style={styles.sortBtn} onPress={() => Alert.alert('排序', '岗位排序功能开发中，敬请期待')}>
        <Text style={styles.sortBtnText}>最新发布</Text>
        <Ionicons name="chevron-down" size={14} color={colors.textHint} />
      </Pressable>
    </View>
  );
}

/* ===================== 子组件：岗位卡片 ===================== */

function JobCard({ job }: { job: JobManagementJob }) {
  return (
    <View style={styles.jobCard}>
      <View style={styles.jobHeader}>
        <View style={styles.jobTitleWrap}>
          <Text style={styles.jobTitle}>{job.title}</Text>
          {job.status === 'active' ? <View style={styles.activeDot} /> : null}
        </View>
        <Ionicons name="chevron-forward" size={18} color={colors.textHint} />
      </View>
      <Text style={styles.jobSalary}>
        {job.salary} · {job.salaryMonths}薪
      </Text>
      <Text style={styles.jobMeta}>{job.city} · {job.experience} · {job.education}</Text>

      <View style={styles.jobScoreRow}>
        <Text style={styles.jobScoreLabel}>综合评分</Text>
        <Text style={styles.jobScoreValue}>{job.overallScore}</Text>
        <View style={styles.rankTag}>
          <Text style={styles.rankTagText}>{job.rankText}</Text>
        </View>
      </View>

      <View style={styles.jobTags}>
        {job.tags.map((tag) => (
          <View key={tag} style={styles.jobTag}>
            <Text style={styles.jobTagText}>{tag}</Text>
          </View>
        ))}
      </View>

      <View style={styles.jobStatsRow}>
        <View style={styles.jobStat}>
          <Text style={styles.jobStatValue}>{job.applicants}</Text>
          <Text style={styles.jobStatLabel}>投递</Text>
        </View>
        <View style={styles.jobStat}>
          <Text style={styles.jobStatValue}>{job.views >= 1000 ? `${(job.views / 1000).toFixed(1)}k` : job.views}</Text>
          <Text style={styles.jobStatLabel}>查看</Text>
        </View>
        <View style={styles.jobStat}>
          <Text style={styles.jobStatValue}>{job.matches}</Text>
          <Text style={styles.jobStatLabel}>匹配</Text>
        </View>
      </View>

      <View style={styles.jobActions}>
        <Pressable style={styles.jobActionBtn} onPress={() => Alert.alert('提示', '功能开发中，敬请期待')}>
          <Ionicons name="create-outline" size={16} color={colors.primary} />
          <Text style={styles.jobActionText}>编辑</Text>
        </Pressable>
        <Pressable style={styles.jobActionBtn} onPress={() => Alert.alert('提示', '功能开发中，敬请期待')}>
          <Ionicons name="refresh-outline" size={16} color={colors.primary} />
          <Text style={styles.jobActionText}>刷新</Text>
        </Pressable>
        <Pressable style={styles.jobActionBtn} onPress={() => Alert.alert('提示', '功能开发中，敬请期待')}>
          <Ionicons name="download-outline" size={16} color={colors.primary} />
          <Text style={styles.jobActionText}>下架</Text>
        </Pressable>
      </View>
    </View>
  );
}

/* ===================== 子组件：空状态 ===================== */

function EmptyState({ benefits, onPublish }: { benefits: string[]; onPublish: () => void }) {
  return (
    <View style={styles.emptyCard}>
      <View style={styles.emptyIconWrap}>
        <Ionicons name="business-outline" size={48} color={colors.primary} />
      </View>
      <Text style={styles.emptyTitle}>还没有发布岗位</Text>
      <Text style={styles.emptySubtitle}>发布你的第一个岗位，开始招聘优秀人才</Text>
      <Pressable style={styles.emptyBtn} onPress={onPublish} hitSlop={6}>
        <Text style={styles.emptyBtnText}>发布岗位</Text>
      </Pressable>

      <View style={styles.benefitCard}>
        <Text style={styles.benefitTitle}>发布岗位后你可以</Text>
        {benefits.map((benefit, index) => (
          <View key={index} style={styles.benefitRow}>
            <Ionicons name="checkmark-circle" size={18} color={colors.success} />
            <Text style={styles.benefitText}>{benefit}</Text>
          </View>
        ))}
      </View>
    </View>
  );
}

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

export default function JobManagementScreen() {
  const router = useRouter();
  const { management, loading, error, refresh } = useJobManagement();
  const [activeTab, setActiveTab] = useState('all');

  const filteredJobs = useMemo(() => {
    if (!management?.hasData) return [];
    if (activeTab === 'all') return management.jobs;
    return management.jobs.filter((job) => {
      if (activeTab === 'active') return job.status === 'active';
      if (activeTab === 'offline') return job.status === 'offline';
      if (activeTab === 'draft') return job.status === 'draft';
      return true;
    });
  }, [management, activeTab]);

  if (loading) {
    return (
      <SafeAreaView style={styles.container} edges={['top']}>
        <Header companyName="智联科技" onBack={() => router.back()} />
        <View style={styles.center}>
          <ActivityIndicator size="large" color={colors.primary} />
        </View>
      </SafeAreaView>
    );
  }

  if (error || !management) {
    return (
      <SafeAreaView style={styles.container} edges={['top']}>
        <Header companyName="智联科技" onBack={() => router.back()} />
        <View style={styles.center}>
          <Ionicons name="alert-circle-outline" size={40} color={colors.danger} />
          <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>
    );
  }

  return (
    <SafeAreaView style={styles.container} edges={['top', 'bottom']}>
      <Header companyName={management.companyName} onBack={() => router.back()} />
      <TabBar tabs={management.tabs} active={activeTab} onChange={setActiveTab} />
      <ScrollView contentContainerStyle={styles.body} showsVerticalScrollIndicator={false}>
        {management.hasData ? (
          <View>
            <StatsOverview stats={management.stats} />
            <SearchFilterBar />
            {filteredJobs.map((job) => (
              <JobCard key={job.id} job={job} />
            ))}
          </View>
        ) : (
          <EmptyState
            benefits={management.benefits}
            onPublish={() => router.push('/job-publish')}
          />
        )}
      </ScrollView>
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  container: { flex: 1, backgroundColor: colors.pageBg },
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: 12,
    paddingVertical: 12,
    backgroundColor: colors.white,
  },
  headerBtn: { width: 40, alignItems: 'center' },
  headerCenter: { alignItems: 'center' },
  headerCompany: { fontSize: 12, color: colors.textSecondary },
  headerTitle: { fontSize: 17, fontWeight: '700', color: colors.textPrimary, marginTop: 2 },
  publishBtn: {
    flexDirection: 'row',
    alignItems: 'center',
    backgroundColor: colors.primaryBtn,
    paddingHorizontal: 12,
    paddingVertical: 6,
    borderRadius: 16,
  },
  publishBtnText: {
    color: colors.white,
    fontSize: 13,
    fontWeight: '600',
    marginLeft: 2,
  },
  tabBar: {
    flexDirection: 'row',
    backgroundColor: colors.white,
    borderBottomWidth: 1,
    borderBottomColor: colors.borderLight,
  },
  tabItem: {
    flex: 1,
    alignItems: 'center',
    paddingTop: 8,
  },
  tabLabel: {
    fontSize: 14,
    color: colors.textSecondary,
    paddingBottom: 8,
  },
  tabLabelActive: {
    color: colors.textPrimary,
    fontWeight: '600',
  },
  tabCount: {
    fontSize: 12,
    color: colors.textHint,
    marginLeft: 2,
  },
  tabCountActive: {
    color: colors.primary,
  },
  tabIndicator: {
    height: 2,
    width: 24,
    borderRadius: 1,
    backgroundColor: 'transparent',
    marginBottom: -1,
  },
  tabIndicatorActive: {
    backgroundColor: colors.primary,
  },
  body: {
    padding: 16,
    paddingBottom: 24,
  },
  center: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    gap: 12,
  },
  tip: { fontSize: 14, color: colors.textSecondary },
  retryBtn: {
    marginTop: 8,
    paddingHorizontal: 24,
    paddingVertical: 8,
    borderRadius: 18,
    backgroundColor: colors.primaryBtn,
  },
  retryText: { color: colors.white, fontSize: 13, fontWeight: '600' },
  statsGrid: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    gap: 12,
    marginBottom: 12,
  },
  statCard: {
    width: '48%',
    flexDirection: 'row',
    alignItems: 'center',
    backgroundColor: colors.white,
    borderRadius: 12,
    padding: 12,
  },
  statIconWrap: {
    width: 40,
    height: 40,
    borderRadius: 10,
    alignItems: 'center',
    justifyContent: 'center',
    marginRight: 10,
  },
  statBody: { flex: 1 },
  statValue: {
    fontSize: 18,
    fontWeight: '800',
    color: colors.textPrimary,
  },
  statLabel: {
    fontSize: 12,
    color: colors.textSecondary,
    marginTop: 2,
  },
  statChangeWrap: {
    alignSelf: 'flex-start',
  },
  statChange: {
    fontSize: 12,
    fontWeight: '600',
  },
  searchBar: {
    flexDirection: 'row',
    alignItems: 'center',
    marginBottom: 12,
    gap: 8,
  },
  searchInputWrap: {
    flex: 1,
    flexDirection: 'row',
    alignItems: 'center',
    backgroundColor: colors.white,
    borderRadius: 8,
    paddingHorizontal: 10,
    paddingVertical: 8,
  },
  searchInput: {
    flex: 1,
    marginLeft: 8,
    fontSize: 14,
    color: colors.textPrimary,
  },
  filterBtn: {
    flexDirection: 'row',
    alignItems: 'center',
    backgroundColor: colors.white,
    borderRadius: 8,
    paddingHorizontal: 10,
    paddingVertical: 8,
  },
  filterBtnText: {
    fontSize: 13,
    color: colors.textPrimary,
    marginLeft: 4,
  },
  sortBtn: {
    flexDirection: 'row',
    alignItems: 'center',
    backgroundColor: colors.white,
    borderRadius: 8,
    paddingHorizontal: 10,
    paddingVertical: 8,
  },
  sortBtnText: {
    fontSize: 13,
    color: colors.textPrimary,
    marginRight: 2,
  },
  jobCard: {
    backgroundColor: colors.white,
    borderRadius: 12,
    padding: 16,
    marginBottom: 12,
  },
  jobHeader: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
  },
  jobTitleWrap: {
    flexDirection: 'row',
    alignItems: 'center',
  },
  jobTitle: {
    fontSize: 16,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  activeDot: {
    width: 8,
    height: 8,
    borderRadius: 4,
    backgroundColor: colors.success,
    marginLeft: 8,
  },
  jobSalary: {
    fontSize: 15,
    fontWeight: '700',
    color: colors.action,
    marginTop: 6,
  },
  jobMeta: {
    fontSize: 13,
    color: colors.textSecondary,
    marginTop: 4,
  },
  jobScoreRow: {
    flexDirection: 'row',
    alignItems: 'center',
    marginTop: 10,
  },
  jobScoreLabel: {
    fontSize: 13,
    color: colors.textSecondary,
  },
  jobScoreValue: {
    fontSize: 14,
    fontWeight: '800',
    color: colors.primary,
    marginLeft: 6,
  },
  rankTag: {
    backgroundColor: colors.primaryLight,
    borderRadius: 8,
    paddingHorizontal: 8,
    paddingVertical: 2,
    marginLeft: 8,
  },
  rankTagText: {
    fontSize: 11,
    color: colors.primaryText,
    fontWeight: '600',
  },
  jobTags: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    gap: 8,
    marginTop: 10,
  },
  jobTag: {
    backgroundColor: colors.pageBg,
    borderRadius: 6,
    paddingHorizontal: 8,
    paddingVertical: 3,
  },
  jobTagText: {
    fontSize: 11,
    color: colors.textSecondary,
  },
  jobStatsRow: {
    flexDirection: 'row',
    marginTop: 14,
    paddingTop: 14,
    borderTopWidth: 1,
    borderTopColor: colors.borderLight,
  },
  jobStat: {
    flex: 1,
    alignItems: 'center',
  },
  jobStatValue: {
    fontSize: 16,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  jobStatLabel: {
    fontSize: 11,
    color: colors.textSecondary,
    marginTop: 2,
  },
  jobActions: {
    flexDirection: 'row',
    justifyContent: 'flex-end',
    marginTop: 12,
    gap: 12,
  },
  jobActionBtn: {
    flexDirection: 'row',
    alignItems: 'center',
  },
  jobActionText: {
    fontSize: 13,
    color: colors.primary,
    marginLeft: 4,
  },
  emptyCard: {
    backgroundColor: colors.white,
    borderRadius: 16,
    padding: 28,
    alignItems: 'center',
  },
  emptyIconWrap: {
    width: 88,
    height: 88,
    borderRadius: 44,
    backgroundColor: colors.primaryLight,
    alignItems: 'center',
    justifyContent: 'center',
    marginBottom: 16,
  },
  emptyTitle: {
    fontSize: 18,
    fontWeight: '700',
    color: colors.textPrimary,
    marginBottom: 8,
  },
  emptySubtitle: {
    fontSize: 13,
    color: colors.textSecondary,
    textAlign: 'center',
    marginBottom: 20,
  },
  emptyBtn: {
    backgroundColor: colors.primaryBtn,
    paddingHorizontal: 32,
    paddingVertical: 12,
    borderRadius: 24,
    marginBottom: 24,
  },
  emptyBtnText: {
    color: colors.white,
    fontSize: 15,
    fontWeight: '600',
  },
  benefitCard: {
    width: '100%',
    backgroundColor: colors.primaryLight,
    borderRadius: 12,
    padding: 16,
    alignItems: 'flex-start',
  },
  benefitTitle: {
    fontSize: 14,
    fontWeight: '700',
    color: colors.primaryText,
    marginBottom: 12,
  },
  benefitRow: {
    flexDirection: 'row',
    alignItems: 'center',
    marginBottom: 10,
  },
  benefitText: {
    fontSize: 13,
    color: colors.textPrimary,
    marginLeft: 10,
  },
});