水印相机前端
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import 'package:dio/dio.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import 'package:geolocator/geolocator.dart';
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import '../core/network/api_exception.dart';
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/// 定位 + 逆地理编码 + 天气。
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///
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/// **注意这里直连外部服务，不走 [dioProvider]** —— 那个 Dio 带着项目的 baseUrl
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/// 和 Authorization 拦截器，会把我们的 JWT 一起发到百度/Open-Meteo 去。
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/// 所以本类自己持有一个干净的 Dio。
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///
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/// AK 说明：沿用原「水印相机」项目的百度服务端 AK（用户已确认个人项目可接受
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/// 硬编码在客户端）。风险只有一个：AK 被刷爆后逆地理会失效，水印仍能正常合成。
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/// 百度地图开放平台 AK（服务端类型，需勾选逆地理编码权限）
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const String _baiduAk = 'I3IYR0glCNfmfYzMoBDr7lLTKdZ8Y0Xs';
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const String _baiduReverseUrl = 'https://api.map.baidu.com/reverse_geocoding/v3/';
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const String _openMeteoUrl = 'https://api.open-meteo.com/v1/forecast';
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final geoApiProvider = Provider<GeoApi>((ref) => GeoApi());
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/// 一次定位拿到的全部信息
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class GeoSnapshot {
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const GeoSnapshot({
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this.latitude,
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this.longitude,
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this.address = '',
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this.weather = '',
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this.temperature = '',
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this.error,
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});
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final double? latitude;
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final double? longitude;
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final String address;
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final String weather;
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final String temperature;
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/// 定位失败时的原因（地址/天气会留空，页面据此提示用户）
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final String? error;
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bool get hasPosition => latitude != null && longitude != null;
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}
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class GeoApi {
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GeoApi({Dio? dio})
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: _dio = dio ??
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Dio(BaseOptions(
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connectTimeout: const Duration(seconds: 8),
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receiveTimeout: const Duration(seconds: 10),
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));
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final Dio _dio;
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/// 取当前位置（WGS84）。
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///
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/// 位置本身失败会抛 [ApiException]（权限没给 / 定位服务没开），
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/// 由调用方决定怎么提示。
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Future<Position> currentPosition() async {
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if (!await Geolocator.isLocationServiceEnabled()) {
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throw ApiException(-1, '定位服务未开启，请到系统设置里打开');
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}
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var permission = await Geolocator.checkPermission();
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if (permission == LocationPermission.denied) {
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permission = await Geolocator.requestPermission();
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}
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if (permission == LocationPermission.deniedForever) {
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throw ApiException(-1, '定位权限已被永久拒绝，请到系统设置里开启');
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}
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if (permission == LocationPermission.denied) {
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throw ApiException(-1, '没有定位权限');
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}
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try {
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return await Geolocator.getCurrentPosition(
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locationSettings: const LocationSettings(
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accuracy: LocationAccuracy.high,
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timeLimit: Duration(seconds: 15),
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),
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);
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} on Exception catch (e) {
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throw ApiException(-1, '定位失败：${e.toString()}');
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}
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}
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/// 经纬度 → 文字地址。
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Future<String> reverseAddress({
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required double latitude,
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required double longitude,
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}) async {
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final Response<dynamic> res;
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try {
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res = await _dio.get<dynamic>(
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_baiduReverseUrl,
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queryParameters: {
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'ak': _baiduAk,
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'output': 'json',
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// geolocator 给的是 WGS84 原始 GPS 坐标，必须显式告诉百度，
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// 否则地址会有几百米偏移
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'coordtype': 'wgs84ll',
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'location': '$latitude,$longitude',
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'extensions_poi': 0,
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},
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);
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} on DioException catch (e) {
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throw ApiException(-1, '地址解析失败：${e.message ?? '网络异常'}');
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}
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final data = res.data;
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if (data is! Map) {
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throw ApiException(-1, '地址解析失败：返回格式异常');
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}
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final status = data['status'];
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if (status != 0) {
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throw ApiException(-1, '地址解析失败：${data['msg'] ?? '百度返回 $status'}');
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}
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final result = data['result'];
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if (result is! Map) {
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throw ApiException(-1, '地址解析失败：没有结果');
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}
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final formatted = result['formatted_address']?.toString() ?? '';
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if (formatted.isNotEmpty) return formatted;
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// 兜底：拼 addressComponent
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final ac = result['addressComponent'];
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if (ac is Map) {
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final joined = '${ac['city'] ?? ''}${ac['district'] ?? ''}'
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'${ac['street'] ?? ''}${ac['street_number'] ?? ''}';
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if (joined.isNotEmpty) return joined;
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}
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throw ApiException(-1, '地址解析失败：结果为空');
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}
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/// 经纬度 → 实时天气。
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///
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/// 拿不到就返回 null —— 天气是锦上添花，**不该因为它失败就让整张照片没法出**。
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Future<({String weather, String temperature})?> weather({
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required double latitude,
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required double longitude,
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}) async {
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try {
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final res = await _dio.get<dynamic>(
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_openMeteoUrl,
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queryParameters: {
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'latitude': latitude,
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'longitude': longitude,
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'current_weather': true,
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'timezone': 'auto',
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},
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);
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final data = res.data;
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if (data is! Map) return null;
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if (data['error'] == true) return null;
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final current = data['current_weather'];
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if (current is! Map) return null;
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final temp = current['temperature'];
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return (
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weather: _weatherText(current['weathercode']),
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temperature: temp is num ? '${temp.round()}℃' : '',
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);
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} catch (_) {
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return null;
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}
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}
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/// 一把梭：定位 → 地址 → 天气。
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///
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/// 定位失败不抛异常，而是返回带 [GeoSnapshot.error] 的结果 —— 用户可能只是
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/// 不想给定位权限，那也该能继续拍照，水印少一行地点而已。
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Future<GeoSnapshot> resolve() async {
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final Position position;
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try {
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position = await currentPosition();
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} on ApiException catch (e) {
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return GeoSnapshot(error: e.message);
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}
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// 地址拿不到就退回「纬度, 经度」，至少信息量不为零（原项目也这么做）
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var address = '${position.latitude.toStringAsFixed(4)}, '
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'${position.longitude.toStringAsFixed(4)}';
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try {
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address = await reverseAddress(
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latitude: position.latitude,
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longitude: position.longitude,
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);
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} catch (_) {
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// 保持坐标兜底
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}
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final weather = await this.weather(
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latitude: position.latitude,
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longitude: position.longitude,
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) ??
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(weather: '', temperature: '');
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return GeoSnapshot(
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latitude: position.latitude,
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longitude: position.longitude,
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address: address,
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weather: weather.weather,
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temperature: weather.temperature,
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);
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}
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/// Open-Meteo 的 WMO 天气码 → 中文
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static String _weatherText(Object? code) {
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if (code is! num) return '';
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return _weatherCodes[code.toInt()] ?? '未知天气';
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}
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}
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const Map<int, String> _weatherCodes = {
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0: '晴空',
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1: '大部晴朗',
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2: '多云',
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3: '阴天',
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45: '雾',
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48: '霜雾',
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51: '细雨',
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53: '中细雨',
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55: '密细雨',
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56: '冻细雨',
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57: '强冻细雨',
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61: '小雨',
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63: '中雨',
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65: '大雨',
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66: '轻冻雨',
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67: '强冻雨',
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71: '小雪',
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73: '中雪',
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75: '大雪',
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77: '雪粒',
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80: '小阵雨',
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81: '中阵雨',
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82: '强阵雨',
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85: '小阵雪',
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86: '大阵雪',
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95: '雷阵雨',
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96: '雷阵雨伴冰雹',
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99: '强雷阵雨伴大冰雹',
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};
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