SafelyYouCodingChallenge/dotnet/SafelyYou/Program.cs

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>();
builder.Services.AddSingleton<UploadTimes>();

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

app.MapPost("/devices/{deviceId}/stats", (string deviceId, UploadStatsRequest request, KnownDevices knownDevices, UploadTimes uploadTimes) =>
{
    var device = new DeviceId(deviceId);
    if (!knownDevices.Contains(device))
    {
        return Results.NotFound(new NotFoundResponse($"Device ID {deviceId} not found"));
    }
    
    uploadTimes.Add(device, request.UploadTime);

    return Results.NoContent();
    
    // not sure where the 500 would go here beyond doing a try/catch
}); 



app.Run();