AacpsBusAlert/BinaryDad.AacpsBusAlert.Worker/Program.cs

using BinaryDad.AacpsBusAlert;
using BinaryDad.Extensions;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Options;
using Newtonsoft.Json;

var host = Host.CreateDefaultBuilder(args)
    .ConfigureAppConfiguration((context, builder) =>
    {
        builder.AddEnvironmentVariables();

        var env = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");// context.HostingEnvironment.EnvironmentName;

        builder.AddJsonFile("appsettings.json");
        builder.AddJsonFile($"appsettings.{env}.json", true);
    })
    .ConfigureServices((context, services) =>
    {
        services.AddHttpClient();

        services.Configure<List<User>>(context.Configuration.GetSection("Users"));
    })
    .Build();

var configuration = host.Services.GetService<IConfiguration>();

var httpClientFactory = host.Services.GetService<IHttpClientFactory>();
var httpClient = httpClientFactory.CreateClient();

var apiBaseUrl = configuration["Urls:Api"];
var apiBusRouteUrl = UrlUtility.Combine(apiBaseUrl, "api/routes");
var busRoutesRaw = await httpClient.GetStringAsync(apiBusRouteUrl);

var userRoutes = host.Services.GetService<IOptions<List<User>>>();

var busRoutes = JsonConvert.DeserializeObject<ICollection<BusRoute>>(busRoutesRaw);

foreach (var userRoute in userRoutes.Value)
{
    var matchedRoutes = busRoutes
        .Join(userRoute.Routes, b => b.BusNumber, u => u.BusNumber, (b, u) => new 
        { 
            UserRoute = u, 
            BusRoute = b 
        })
        .ToList();

    // send alert for these buses

    Console.WriteLine($"User {userRoute.Email} has {matchedRoutes.Count} delays:");

    foreach (var matchedRoute in matchedRoutes)
    {
        Console.WriteLine($"  {matchedRoute.BusRoute.BusNumber} ({matchedRoute.UserRoute.Label}): {matchedRoute.BusRoute.Impact} for {matchedRoute.BusRoute.Schedules}");
    }
}

Console.ReadLine();