using System.Diagnostics;
using System.Reflection;
using Microsoft.Extensions.Logging;
using Telegram.Bot;
using Telegram.Bot.Polling;
using Microsoft.Extensions.Configuration;
using TelegramBot.Config;

namespace TelegramBot;

public static class Program
{
    private static ILogger Logger { get; } = LoggerFactory.Create(x => { x.AddConsole(); })
        .CreateLogger("MainThread");

    private static ITelegramBotClient bot { get; set; }

    public static AppSettings Config { get; private set; }

    public static void Main()
    {
        Splash(Logger);
        LoadConfig();
        var cts = LoadBot();
        while(!cts.IsCancellationRequested)
            Thread.Sleep(1000);
    }

    private static void Splash(ILogger logger)
    {
        var splash = """
                      ____                     ____            _        ____        _
                     / ___|_      ____ _ _ __ |  _ \ _   _  __| | ___  | __ )  ___ | |_
                     \___ \ \ /\ / / _` | '_ \| | | | | | |/ _` |/ _ \ |  _ \ / _ \| __|
                      ___) \ V  V / (_| | |_) | |_| | |_| | (_| |  __/_| |_) | (_) | |_
                     |____/ \_/\_/ \__,_| .__/|____/ \__,_|\__,_|\___(_)____/ \___/ \__|
                                        |_|
                     """;
        logger.LogWarning(splash);
        logger.LogInformation(
            $"Build assembly version: {FileVersionInfo.GetVersionInfo(Assembly.GetExecutingAssembly().Location).FileVersion}");
    }

    private static void LoadConfig()
    {
        Logger.LogInformation("Loading config...");
        IConfigurationRoot configuration = new ConfigurationBuilder()
            .AddJsonFile("telegramconfig.json", optional: false)
            #if DEBUG
            .AddJsonFile("telegramconfig.local.json", true, true)
            #endif
            .Build();
        Config = configuration.GetSection("AppSettings").Get<AppSettings>() ?? throw new NullReferenceException();
    }

    private static CancellationTokenSource LoadBot()
    {
        Logger.LogInformation("Creating bot...");

        bot = new TelegramBotClient(Config.Token ?? throw new NullReferenceException());
        var cts = new CancellationTokenSource();
        var receiverOptions = new ReceiverOptions
        {
            AllowedUpdates = { }
        };
        bot.StartReceiving(BotHandler.HandleUpdateAsync,
            BotHandler.HandleErrorAsync, receiverOptions, cts.Token);

        return cts;
    }
}