import 'dart:io';
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:flutter_map/flutter_map.dart';
// import 'package:flutter_map_tile_caching/flutter_map_tile_caching.dart';
import 'package:http/http.dart' as http;
import 'package:path_provider/path_provider.dart';
import 'package:path/path.dart' as path;

import 'dart:ui' as ui;

/// 地图瓦片缓存工具类
class KRFMTC {
  static const String kr_storeName = 'kaer_map_store';
  
  /// HTTP 客户端，用于复用连接
  static late final http.Client _httpClient = http.Client();
  
  /// 瓦片提供者实例
  static late final TileProvider _tileProvider = NetworkTileProvider();

  /// 判断是否在中国大陆
  static bool _kr_isInMainlandChina() {
    // 获取系统语言
    final List<Locale> systemLocales = ui.window.locales;
    final String? languageCode = systemLocales.isNotEmpty ? systemLocales.first.languageCode : null;
    final String? countryCode = systemLocales.isNotEmpty ? systemLocales.first.countryCode : null;

    // 获取系统时区
    final String timeZoneName = DateTime.now().timeZoneName;
    
    // 检查是否为中文语言环境
    bool isChineseLanguage = languageCode == 'zh';
    // 检查是否为中国地区代码
    bool isChineseRegion = countryCode == 'CN';
    // 检查是否为中国时区
    bool isChineseTimezone = timeZoneName.contains('China') || timeZoneName == 'Asia/Shanghai';

    // 如果同时满足语言和地区或时区条件，则认为在中国大陆
    return (isChineseLanguage && (isChineseRegion || isChineseTimezone));
  }

  /// 获取地图瓦片URL
  static String kr_getTileUrl() {
    if (_kr_isInMainlandChina()) {
      // 使用高德地图
      return 'https://webst0{s}.is.autonavi.com/appmaptile?style=7&x={x}&y={y}&z={z}';
    } else {
      // 使用 OpenStreetMap
      return 'https://tile.openstreetmap.org/{z}/{x}/{y}.png';
    }
  }

  /// 获取地图瓦片子域名
  static List<String> kr_getTileSubdomains() {
    if (_kr_isInMainlandChina()) {
      return ['1', '2', '3', '4'];
    } else {
      return ['a', 'b', 'c'];
    }
  }

  /// 获取地图瓦片提供者
  static TileProvider kr_getTileProvider() {
    return _tileProvider;
  }

  /// 初始化地图缓存
  static Future<void> kr_initMapCache() async {
    // 不使用缓存，无需实现
  }

  /// 清理地图缓存
  static Future<void> kr_clearMapCache() async {
    // 不使用缓存，无需实现
  }

  /// 检查瓦片是否已缓存
  static Future<bool> kr_isTileCached({
    required TileCoordinates coords,
    required TileLayer options,
  }) async {
    return false;
  }

  /// 获取缓存状态信息
  static Future<({bool isAvailable, int cacheCount, String cacheSize})> kr_checkCacheStatus() async {
    return (isAvailable: false, cacheCount: 0, cacheSize: '0 MB');
  }

  /// 释放资源
  static void kr_dispose() {
    _httpClient.close();
  }
} 