SafelyYouCodingChallenge/dotnet/SafelyYou/Program.cs

using Microsoft.AspNetCore.Http.HttpResults;
using SafelyYou;
using SafelyYou.Api;
using SafelyYou.Config;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
// Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
builder.Services.AddOpenApi();

builder.Services.AddSingleton<KnownDevices>(_ =>
{
    var deviceIds = File.ReadAllLines("/devices.csv").Skip(1).Select(id => new DeviceId(id)).ToHashSet();
    return new KnownDevices(deviceIds);
});

builder.Services.AddSingleton<HeartBeatHistoryConfig>(_ =>
{
    var millis = builder.Configuration.GetSection("HeartBeatHistory").GetValue<int>("WindowMillis");
    return new HeartBeatHistoryConfig() { Window = TimeSpan.FromMilliseconds(millis) };
});

builder.Services.AddSingleton<HeartBeatHistories>();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.MapOpenApi();
}

app.UseHttpsRedirection();

// heartbeat history
// upload stats


app.MapPost("/devices/{deviceId}/heartbeat", (string deviceId, HeartbeatRequest request,
    KnownDevices knownDevices, HeartBeatHistories histories) =>
{
    var device = new DeviceId(deviceId);
    if (!knownDevices.Contains(device))
    {
        return Results.NotFound(new NotFoundResponse($"Device ID {deviceId} not found"));
    }

    var addResult = histories.Add(device, request.SentAt);

    return addResult switch
    {
        DeviceHeartBeatHistory.AddResult.Added => Results.Ok(),
        DeviceHeartBeatHistory.AddResult.OutOfSequence => Results.InternalServerError(
            new ErrorResponse("Attempted to add a timestamp that was out of sequence or invalid.")),
        _ => throw new ArgumentOutOfRangeException()
    };
});


var summaries = new[]
{
    "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
};

app.MapGet("/weatherforecast", () =>
{
    var forecast =  Enumerable.Range(1, 5).Select(index =>
        new WeatherForecast
        (
            DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
            Random.Shared.Next(-20, 55),
            summaries[Random.Shared.Next(summaries.Length)]
        ))
        .ToArray();
    return forecast;
})
.WithName("GetWeatherForecast");

app.Run();

record WeatherForecast(DateOnly Date, int TemperatureC, string? Summary)
{
    public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
}