// EServicesScreen.tsx
import { useTheme } from '@/components/ThemeContext';
import { useInfiniteQuery } from '@tanstack/react-query';
import { Image } from 'expo-image';
import { ChevronLeft, XIcon } from 'lucide-react-native';
import React, { useCallback, useRef, useState } from 'react';
import {
  ActivityIndicator,
  Dimensions,
  FlatList,
  Modal,
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import { WebView } from 'react-native-webview';
import { eservices_api } from '../lib/api';

const { width: SCREEN_WIDTH } = Dimensions.get('window');
const PAGE_SIZE = 10;

export interface GovermentServiceDataRes {
  id: number;
  name: string;
  url: string;
  logo: string;
}

export default function EServicesScreen() {
  const { isDark } = useTheme();
  const [webUrl, setWebUrl] = useState<string | null>(null);
  const [modalVisible, setModalVisible] = useState(false);
  const webviewRef = useRef<WebView>(null); // WebView ref for goBack

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

  const services: GovermentServiceDataRes[] = data?.pages.flatMap((p) => p.results) ?? [];

  const openWebView = (url: string) => {
    setWebUrl(url);
    setModalVisible(true);
  };

  const renderItem = useCallback(
    ({ item }: { item: GovermentServiceDataRes }) => (
      <TouchableOpacity
        style={[
          styles.card,
          { backgroundColor: isDark ? '#1e293b' : '#f8fafc' },
          isDark ? styles.darkShadow : styles.lightShadow,
        ]}
        onPress={() => openWebView(item.url)}
      >
        <Image source={{ uri: item.logo }} style={styles.logo} resizeMode="contain" />
        <Text style={[styles.name, { color: isDark ? '#f1f5f9' : '#0f172a' }]}>{item.name}</Text>
      </TouchableOpacity>
    ),
    [isDark]
  );

  if (isLoading) {
    return (
      <View style={[styles.center, { backgroundColor: isDark ? '#0f172a' : '#f8fafc' }]}>
        <ActivityIndicator size="large" color="#3b82f6" />
      </View>
    );
  }

  if (isError) {
    return (
      <View style={[styles.center, { backgroundColor: isDark ? '#0f172a' : '#f8fafc' }]}>
        <Text style={{ color: 'red' }}>Xatolik yuz berdi</Text>
      </View>
    );
  }

  return (
    <View style={{ flex: 1, backgroundColor: isDark ? '#0f172a' : '#f8fafc' }}>
      <FlatList
        data={services}
        keyExtractor={(item) => item.id.toString()}
        renderItem={renderItem}
        numColumns={2}
        columnWrapperStyle={{ justifyContent: 'space-between', marginBottom: 12 }}
        contentContainerStyle={{ padding: 16 }}
        onEndReached={() => hasNextPage && fetchNextPage()}
        onEndReachedThreshold={0.4}
        ListFooterComponent={
          isFetchingNextPage ? <ActivityIndicator color="#3b82f6" style={{ margin: 20 }} /> : null
        }
        showsVerticalScrollIndicator={false}
      />

      {/* WebView Modal */}
      {/* WebView Modal */}
      <Modal visible={modalVisible} animationType="slide">
        <SafeAreaView
          style={{
            flex: 1,
            backgroundColor: isDark ? '#0f172a' : '#f8fafc', // modal background
          }}
        >
          {/* Header */}
          <View
            style={{
              flexDirection: 'row',
              padding: 12,
              backgroundColor: isDark ? '#1e293b' : '#f8fafc', // header background
              alignItems: 'center',
              justifyContent: 'space-between',
            }}
          >
            {/* Back tugmasi */}
            <TouchableOpacity
              onPress={() => {
                if (webviewRef.current) webviewRef.current.goBack();
              }}
              hitSlop={{ top: 10, bottom: 10, left: 10, right: 10 }}
            >
              <ChevronLeft color={isDark ? '#f1f5f9' : '#0f172a'} size={24} />
            </TouchableOpacity>

            {/* Close tugmasi */}
            <TouchableOpacity
              onPress={() => setModalVisible(false)}
              hitSlop={{ top: 10, bottom: 10, left: 10, right: 10 }}
            >
              <XIcon color={isDark ? '#f1f5f9' : '#0f172a'} size={24} />
            </TouchableOpacity>
          </View>

          {/* WebView */}
          {webUrl && (
            <WebView
              ref={webviewRef}
              source={{ uri: webUrl }}
              style={{ flex: 1, backgroundColor: isDark ? '#0f172a' : '#f8fafc' }} // webview background
              startInLoadingState
              renderLoading={() => (
                <ActivityIndicator color="#3b82f6" size="large" style={{ flex: 1 }} />
              )}
            />
          )}
        </SafeAreaView>
      </Modal>
    </View>
  );
}

const CARD_WIDTH = (SCREEN_WIDTH - 48) / 2;

const styles = StyleSheet.create({
  center: { flex: 1, justifyContent: 'center', alignItems: 'center' },
  card: {
    width: CARD_WIDTH,
    borderRadius: 12,
    padding: 12,
    alignItems: 'center',
  },
  logo: {
    width: 60,
    height: 60,
    marginBottom: 8,
  },
  name: {
    fontSize: 14,
    fontWeight: '600',
    textAlign: 'center',
  },
  darkShadow: {
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 2 },
    shadowOpacity: 0.4,
    shadowRadius: 6,
    elevation: 3,
  },
  lightShadow: {
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 2 },
    shadowOpacity: 0.1,
    shadowRadius: 4,
    elevation: 2,
  },
});