101 lines
4.0 KiB
C#
101 lines
4.0 KiB
C#
using System.ComponentModel;
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using System.Net.Http.Headers;
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using System.Text.Json;
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namespace MAF1.Tools;
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public sealed class WeatherTools(WeatherOptions options, HttpClient http)
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{
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[Description("Look up live weather for a city or location. Always call this instead of guessing.")]
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public async Task<string> GetWeather(
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[Description("City or location name, for example Amsterdam or 北京.")] string location)
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{
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if (string.IsNullOrWhiteSpace(location))
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{
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return "未提供地点，无法查询天气。";
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}
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string provider = options.Provider.Trim();
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try
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{
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if (provider.Equals("OpenWeather", StringComparison.OrdinalIgnoreCase))
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{
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if (string.IsNullOrWhiteSpace(options.OpenWeather.ApiKey))
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{
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return "OpenWeather 已启用，但 appsettings.json 里 Weather:OpenWeather:ApiKey 为空。请填入密钥，或把 Provider 改回 Wttr。";
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}
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return await QueryOpenWeatherAsync(location);
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}
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return await QueryWttrAsync(location);
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}
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catch (Exception ex)
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{
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return $"查询天气失败（{provider} / {location}）：{ex.Message}";
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}
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}
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private async Task<string> QueryWttrAsync(string location)
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{
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string url = Expand(options.Wttr.UrlTemplate, location, apiKey: null);
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using HttpResponseMessage response = await http.GetAsync(url);
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string body = (await response.Content.ReadAsStringAsync()).Trim();
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if (!response.IsSuccessStatusCode)
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{
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return $"wttr.in 返回 {(int)response.StatusCode}：{body}";
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}
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return string.IsNullOrWhiteSpace(body)
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? $"wttr.in 没有返回 {location} 的天气。"
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: body;
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}
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private async Task<string> QueryOpenWeatherAsync(string location)
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{
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string url = Expand(options.OpenWeather.UrlTemplate, location, options.OpenWeather.ApiKey);
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using HttpResponseMessage response = await http.GetAsync(url);
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string body = await response.Content.ReadAsStringAsync();
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if (!response.IsSuccessStatusCode)
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{
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return $"OpenWeather 返回 {(int)response.StatusCode}：{body}";
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}
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using JsonDocument doc = JsonDocument.Parse(body);
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JsonElement root = doc.RootElement;
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string name = root.TryGetProperty("name", out JsonElement nameEl) ? nameEl.GetString() ?? location : location;
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string description = root.TryGetProperty("weather", out JsonElement weather)
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&& weather.ValueKind == JsonValueKind.Array
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&& weather.GetArrayLength() > 0
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&& weather[0].TryGetProperty("description", out JsonElement descEl)
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? descEl.GetString() ?? ""
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: "";
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double temp = root.TryGetProperty("main", out JsonElement main) && main.TryGetProperty("temp", out JsonElement tempEl)
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? tempEl.GetDouble()
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: double.NaN;
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int humidity = main.ValueKind == JsonValueKind.Object && main.TryGetProperty("humidity", out JsonElement humidityEl)
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? humidityEl.GetInt32()
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: 0;
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return double.IsNaN(temp)
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? body
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: $"{name}：{description}，气温 {temp:0.#}°C，湿度 {humidity}%";
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}
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private string Expand(string template, string location, string? apiKey)
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{
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return template
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.Replace("{location}", Uri.EscapeDataString(location), StringComparison.OrdinalIgnoreCase)
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.Replace("{lang}", Uri.EscapeDataString(options.Language), StringComparison.OrdinalIgnoreCase)
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.Replace("{apiKey}", apiKey ?? "", StringComparison.OrdinalIgnoreCase);
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}
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public static HttpClient CreateHttpClient()
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{
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HttpClient http = new() { Timeout = TimeSpan.FromSeconds(20) };
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http.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("MAF1", "1.0"));
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http.DefaultRequestHeaders.AcceptLanguage.ParseAdd("zh-CN,zh;q=0.9,en;q=0.8");
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return http;
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}
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}
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