111

2026-09-23 18:19:40 +08:00
parent db7bd2231a
commit 6a622c9bd5
8 changed files with 534 additions and 247 deletions
@@ -0,0 +1,127 @@
+using Evergreen.Health.Application.Health.Entities;
+using Evergreen.Health.Application.Health.Models;
+using System.Text.Json;
+
+namespace Evergreen.Health.Application.Health.Services;
+
+// 重庆演示场景：BMI 只给出可手动修改的软硬起点，不是医学或人体工学诊断。
+public sealed class MattressComfortService : ITransient
+{
+    // 演示使用 Open-Meteo 接口；正式商用前应确认许可或替换为有授权的天气源。
+    private const string WeatherUrl =
+        "https://api.open-meteo.com/v1/forecast?latitude=29.56&longitude=106.55&current=temperature_2m%2Capparent_temperature&timezone=Asia%2FShanghai";
+    private static readonly HttpClient WeatherClient = new() { Timeout = TimeSpan.FromSeconds(6) };
+    private static readonly SemaphoreSlim WeatherLock = new(1, 1);
+    private static WeatherSample? CachedWeather;
+
+    public async Task<MattressComfortOutput> GetAsync(HealthProfile? profile, CancellationToken cancellationToken = default)
+    {
+        decimal? bmi = null;
+        if (profile?.HeightCm > 0 && profile.WeightKg > 0)
+        {
+            var height = profile.HeightCm.Value / 100m;
+            bmi = Math.Round(profile.WeightKg.Value / (height * height), 1);
+        }
+
+        var firmness = bmi switch
+        {
+            < 18.5m => "很软",
+            < 24m => "稍软",
+            < 28m => "稍硬",
+            < 32m => "很硬",
+            >= 32m => "最硬",
+            _ => null
+        };
+        var chinaNow = DateTimeOffset.UtcNow.ToOffset(TimeSpan.FromHours(8));
+        var winter = chinaNow.Month is 12 or 1 or 2;
+        var weather = await ReadWeatherAsync(cancellationToken);
+        var heating = 0;
+        if (winter && weather?.FeelsLikeCelsius is double feelsLike)
+            heating = feelsLike < 8 ? 2 : feelsLike < 16 ? 1 : 0;
+
+        var weatherReason = !winter
+            ? "重庆非冬季，床垫加热关闭"
+            : weather == null
+                ? "重庆天气暂不可用，为安全起见不自动加热"
+                : heating == 0
+                    ? "重庆处于冬季，但当前体感温度较高，不自动加热"
+                    : $"重庆冬季体感 {weather.FeelsLikeCelsius:0.#}℃，建议加热 {heating} 档";
+
+        return new MattressComfortOutput
+        {
+            Bmi = bmi,
+            Firmness = firmness,
+            HeatingLevel = heating,
+            IsWinter = winter,
+            OutdoorTemperatureCelsius = weather?.TemperatureCelsius,
+            FeelsLikeCelsius = weather?.FeelsLikeCelsius,
+            WeatherAvailable = weather != null,
+            WeatherObservedAt = weather?.ObservedAt,
+            WeatherReason = weatherReason,
+            FirmnessReason = firmness == null
+                ? "健康档案尚无身高和体重，暂不自动调节软硬度"
+                : $"按 BMI {bmi:0.0} 给出“{firmness}”演示起点，可在设备详情手动调整"
+        };
+    }
+
+    public static void ApplyTo(PersonalizedSceneConfig config, MattressComfortOutput recommendation)
+    {
+        config.MattressHeatingLevel = recommendation.HeatingLevel;
+        config.MattressLeftFirmness = recommendation.Firmness == null ? 0 : FirmnessLevel(recommendation.Firmness);
+        config.MattressRightFirmness = config.MattressLeftFirmness;
+    }
+
+    public static int FirmnessLevel(string firmness) => firmness switch
+    {
+        "最软" => 1, "很软" => 2, "稍软" => 3,
+        "稍硬" => 4, "很硬" => 5, "最硬" => 6,
+        _ => 0
+    };
+
+    public static string? FirmnessName(int level) => level switch
+    {
+        1 => "最软", 2 => "很软", 3 => "稍软",
+        4 => "稍硬", 5 => "很硬", 6 => "最硬",
+        _ => null
+    };
+
+    private static async Task<WeatherSample?> ReadWeatherAsync(CancellationToken cancellationToken)
+    {
+        if (CachedWeather is { } cached && DateTimeOffset.UtcNow - cached.FetchedAt < TimeSpan.FromMinutes(30))
+            return cached;
+
+        await WeatherLock.WaitAsync(cancellationToken);
+        try
+        {
+            if (CachedWeather is { } fresh && DateTimeOffset.UtcNow - fresh.FetchedAt < TimeSpan.FromMinutes(30))
+                return fresh;
+
+            using var response = await WeatherClient.GetAsync(WeatherUrl, cancellationToken);
+            response.EnsureSuccessStatusCode();
+            await using var stream = await response.Content.ReadAsStreamAsync(cancellationToken);
+            using var json = await JsonDocument.ParseAsync(stream, cancellationToken: cancellationToken);
+            var current = json.RootElement.GetProperty("current");
+            var temperature = current.GetProperty("temperature_2m").GetDouble();
+            var feelsLike = current.GetProperty("apparent_temperature").GetDouble();
+            var observedAt = current.GetProperty("time").GetString();
+            CachedWeather = new WeatherSample(temperature, feelsLike, observedAt, DateTimeOffset.UtcNow);
+            return CachedWeather;
+        }
+        catch (OperationCanceledException) when (cancellationToken.IsCancellationRequested)
+        {
+            throw;
+        }
+        catch
+        {
+            // 天气失败时不使用过期值自动开启加热，冬季也安全关闭。
+            return null;
+        }
+        finally
+        {
+            WeatherLock.Release();
+        }
+    }
+
+    private sealed record WeatherSample(
+        double TemperatureCelsius, double FeelsLikeCelsius, string? ObservedAt, DateTimeOffset FetchedAt);
+}