import { useTheme } from '@/components/ThemeContext';
import { formatNumber } from '@/constants/formatPhone';
import { useInfiniteQuery } from '@tanstack/react-query';
import { useRouter } from 'expo-router';
import { ArrowLeft, Plus, User } from 'lucide-react-native';
import { useCallback, useState } from 'react';
import { useTranslation } from 'react-i18next';
import {
  ActivityIndicator,
  FlatList,
  Pressable,
  RefreshControl,
  StyleSheet,
  Text,
  View,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import { user_api } from '../lib/api';
import { ExployeesDataResponse } from '../lib/type';

const PAGE_SIZE = 20;

export function EmployeesTab() {
  const router = useRouter();
  const [refreshing, setRefreshing] = useState(false);
  const { isDark } = useTheme();
  const { t } = useTranslation();

  const theme = {
    background: isDark ? '#0f172a' : '#f8fafc',
    cardBg: isDark ? '#1e293b' : '#ffffff',
    text: isDark ? '#f8fafc' : '#0f172a',
    textSecondary: isDark ? '#94a3b8' : '#64748b',
    iconBg: isDark ? '#1e40af15' : '#dbeafe',
    primary: '#3b82f6',
    emptyIcon: isDark ? '#334155' : '#cbd5e1',
  };

  const { data, isLoading, isError, fetchNextPage, hasNextPage, isFetchingNextPage, refetch } =
    useInfiniteQuery({
      queryKey: ['employees_list'],
      queryFn: async ({ pageParam = 1 }) => {
        const response = await user_api.employess({
          page: pageParam,
          page_size: PAGE_SIZE,
        });
        return response.data.data;
      },
      getNextPageParam: (lastPage) =>
        lastPage && lastPage.current_page && lastPage.total_pages
          ? lastPage.current_page < lastPage.total_pages
            ? lastPage.current_page + 1
            : undefined
          : undefined,
      initialPageParam: 1,
    });

  const allEmployees = data?.pages.flatMap((p) => p.results) ?? [];

  const renderItem = useCallback(
    ({ item }: { item: ExployeesDataResponse }) => (
      <View style={[styles.card, { backgroundColor: theme.cardBg }]}>
        <View style={[styles.iconContainer, { backgroundColor: theme.iconBg }]}>
          <User size={24} color={theme.primary} />
        </View>
        <View style={styles.infoContainer}>
          <Text style={[styles.name, { color: theme.text }]}>
            {item.first_name} {item.last_name}
          </Text>
          <Text style={[styles.phone, { color: theme.textSecondary }]}>
            {formatNumber(item.phone)}
          </Text>
        </View>
      </View>
    ),
    [theme]
  );

  const onRefresh = async () => {
    setRefreshing(true);
    await refetch();
    setRefreshing(false);
  };

  if (isLoading) {
    return (
      <SafeAreaView style={[styles.container, { backgroundColor: theme.background }]}>
        <View style={styles.topHeader}>
          <Pressable onPress={() => router.push('/profile')}>
            <ArrowLeft color={theme.text} />
          </Pressable>
          <Text style={[styles.headerTitle, { color: theme.text }]}>{t('Xodimlar')}</Text>
          <Pressable onPress={() => router.push('/profile/employees/add')}>
            <Plus color={theme.primary} />
          </Pressable>
        </View>
        <ActivityIndicator size={'large'} />
      </SafeAreaView>
    );
  }

  if (isError) {
    return (
      <View style={[styles.container, { backgroundColor: theme.background }]}>
        <Text style={{ color: 'red', marginTop: 50, textAlign: 'center' }}>
          {t('Xatolik yuz berdi')}
        </Text>
      </View>
    );
  }

  return (
    <SafeAreaView style={[styles.container, { backgroundColor: theme.background }]}>
      <View style={styles.topHeader}>
        <Pressable onPress={() => router.push('/profile')}>
          <ArrowLeft color={theme.text} />
        </Pressable>
        <Text style={[styles.headerTitle, { color: theme.text }]}>{t('Xodimlar')}</Text>
        <Pressable onPress={() => router.push('/profile/employees/add')}>
          <Plus color={theme.primary} />
        </Pressable>
      </View>

      <FlatList
        data={allEmployees}
        keyExtractor={(item) => item.phone}
        renderItem={renderItem}
        contentContainerStyle={styles.list}
        onEndReached={() => {
          if (hasNextPage && !isFetchingNextPage) {
            fetchNextPage();
          }
        }}
        onEndReachedThreshold={0.5}
        refreshControl={
          <RefreshControl refreshing={refreshing} onRefresh={onRefresh} tintColor={theme.primary} />
        }
        ListFooterComponent={isFetchingNextPage ? <ActivityIndicator size={'large'} /> : null}
        ListEmptyComponent={
          <View style={styles.emptyContainer}>
            <User size={64} color={theme.emptyIcon} />
            <Text style={[styles.emptyText, { color: theme.textSecondary }]}>
              {t("Hozircha xodimlar yo'q")}
            </Text>
            <Pressable
              style={[styles.emptyButton, { backgroundColor: theme.primary }]}
              onPress={() => router.push('/profile/employees/add')}
            >
              <Plus size={20} color="#fff" />
              <Text style={styles.emptyButtonText}>{t("Xodim qo'shish")}</Text>
            </Pressable>
          </View>
        }
      />
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  container: { flex: 1 },
  addButton: { padding: 8 },
  list: { padding: 16, gap: 12 },
  card: {
    flexDirection: 'row',
    alignItems: 'center',
    borderRadius: 16,
    padding: 16,
    gap: 12,
  },
  iconContainer: {
    width: 56,
    height: 56,
    borderRadius: 28,
    alignItems: 'center',
    justifyContent: 'center',
  },
  infoContainer: { flex: 1, gap: 4 },
  name: { fontSize: 17, fontWeight: '700' },
  phone: { fontSize: 15, fontWeight: '500' },
  emptyContainer: { alignItems: 'center', justifyContent: 'center', paddingVertical: 80, gap: 16 },
  emptyText: { fontSize: 17, fontWeight: '600' },
  emptyButton: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 8,
    paddingHorizontal: 24,
    paddingVertical: 12,
    borderRadius: 12,
    marginTop: 8,
  },
  emptyButtonText: { fontSize: 16, fontWeight: '600', color: '#fff' },
  topHeader: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    padding: 16,
    alignItems: 'center',
  },
  headerTitle: { fontSize: 18, fontWeight: '700' },
});