Program.cs

using Discord;
using Discord.Commands;
using Discord.Interactions;
using Discord.WebSocket;
using Portal.DB;
using Portal.Helpers;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Serilog;

namespace Portal;

public class Program
{
    public static async Task Main()
    {
        // Create config builder
        var configuration = new ConfigurationBuilder()
            .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
            .AddEnvironmentVariables()
            .Build();
        Log.Debug("Configuration loaded");
        
        Log.Debug("Configuring logger");
        ConfigureLogger(configuration["Logger:Template"]!);

        DiscordSocketConfig discordSocketConfig = new()
        {
            GatewayIntents = GatewayIntents.Guilds | GatewayIntents.GuildMessages | GatewayIntents.MessageContent,
            LogGatewayIntentWarnings = false,
            LogLevel = LogSeverity.Debug
        };

        // Creating a .NET generic Host instance
        IHost host = Host.CreateDefaultBuilder()
            .ConfigureServices(serviceCollection =>
            {
                serviceCollection.AddSingleton(discordSocketConfig)
                    .AddSingleton<IConfiguration>(configuration)
                    .AddDbContext<BotDbContext>(
                        options => options.UseSqlite(configuration["Database:ConnectionString"]))
                    .AddSingleton<DiscordSocketClient>()
                    .AddSingleton(provider => 
                        new InteractionService(provider.GetRequiredService<DiscordSocketClient>()))
                    .AddSingleton<CommandService>()
                    .AddSingleton<InteractionHandler>()
                    .AddSingleton<CommandHandler>()
                    .AddTransient<Helper>();
                serviceCollection.AddHostedService<BotService>();
                Log.Debug("Added dependencies to ServiceCollection");
            })
            .UseSerilog()
            .Build();
        Log.Debug("Built host successfully");
        Log.Debug("Attempting to start application");
        
        // Start the host
        await host.RunAsync();
    }

    private static void ConfigureLogger(string loggerTemplate)
    {
        // Additional configs for logger like formatters
        Log.Logger = new LoggerConfiguration()
            .MinimumLevel.Debug()
            .Enrich.WithAssemblyName()
            .WriteTo.Console(outputTemplate: loggerTemplate)
            .CreateLogger();
    }
}