using System;
using System.IO;
using System.Reflection;
using System.Threading.Tasks;
using DSharpPlus;
using DSharpPlus.Interactivity;
using DSharpPlus.Interactivity.Enums;
using DSharpPlus.Interactivity.Extensions;
using DSharpPlus.SlashCommands;
using Microsoft.Extensions.Logging;
using Breadcraft.Commands;

namespace Breadcraft;

internal static class Breadcraft
{
	// Sets up a dummy client to use for logging
	public static DiscordClient discordClient = new DiscordClient(new DiscordConfiguration { Token = "DUMMY_TOKEN", TokenType = TokenType.Bot, MinimumLogLevel = LogLevel.Debug });
	private static SlashCommandsExtension commands = null;

	private static void Main()
	{
		MainAsync().GetAwaiter().GetResult();
	}

	private static async Task MainAsync()
	{
		Logger.Log("Starting " + Assembly.GetEntryAssembly()?.GetName().Name + " version " + GetVersion() + "...");
		try
		{
			Reload();

			// Block this task until the program is closed.
			await Task.Delay(-1);
		}
		catch (Exception e)
		{
			Logger.Fatal("Fatal error:\n" + e);
			Console.ReadLine();
		}
	}

	public static string GetVersion()
	{
		Version version = Assembly.GetEntryAssembly()?.GetName().Version;
        return version?.Major + "." + version?.Minor + "." + version?.Build + (version?.Revision == 0 ? "" : "-" + (char)(64 + version?.Revision ?? 0));
    }

	public static async void Reload()
	{
		if (discordClient != null)
		{
			await discordClient.DisconnectAsync();
			discordClient.Dispose();
			Logger.Log("Discord client disconnected.");
		}
			
		Logger.Log("Loading config \"" + Directory.GetCurrentDirectory() + Path.DirectorySeparatorChar + "config.yml\"");
		Config.LoadConfig();
			
		// Check if token is unset
		if (Config.token is "<add-token-here>" or "")
		{
			Logger.Fatal("You need to set your bot token in the config and start the bot again.");
			throw new ArgumentException("Invalid Discord bot token");
		}

		// Database connection and setup
		try
		{
			Logger.Log("Connecting to database... (" + Config.hostName + ":" + Config.port + ")");
			Database.SetConnectionString(Config.hostName, Config.port, Config.database, Config.username, Config.password);
			Database.SetupTables();
		}
		catch (Exception e)
		{
			Logger.Fatal("Could not set up database tables, please confirm connection settings, status of the server and permissions of MySQL user. Error: " + e);
			throw;
		}
			
		Logger.Log("Setting up Discord client...");
			
		// Setting up client configuration
		DiscordConfiguration cfg = new DiscordConfiguration
		{
			Token = Config.token,
			TokenType = TokenType.Bot,
			MinimumLogLevel = Config.logLevel,
			AutoReconnect = true,
			Intents = DiscordIntents.All
		};
			
		discordClient = new DiscordClient(cfg);
			
		Logger.Log("Hooking events...");
		discordClient.Ready += EventHandler.OnReady;
		discordClient.GuildAvailable += EventHandler.OnGuildAvailable;
		discordClient.ClientErrored += EventHandler.OnClientError;
		discordClient.MessageCreated += EventHandler.OnMessageCreated;
		discordClient.GuildMemberAdded += EventHandler.OnMemberAdded;
		discordClient.GuildMemberRemoved += EventHandler.OnMemberRemoved;
		discordClient.ComponentInteractionCreated += EventHandler.OnComponentInteractionCreated;
			
		discordClient.UseInteractivity(new InteractivityConfiguration
		{
			AckPaginationButtons = true,
			PaginationBehaviour = PaginationBehaviour.Ignore,
			PaginationDeletion = PaginationDeletion.DeleteMessage,
			Timeout = TimeSpan.FromMinutes(15)
		});
			
		Logger.Log("Registering commands...");
		commands = discordClient.UseSlashCommands();

		commands.RegisterCommands<AddCategoryCommand>();
		commands.RegisterCommands<AddCommand>();
		commands.RegisterCommands<AddMessageCommand>();
		commands.RegisterCommands<AddStaffCommand>();
		commands.RegisterCommands<AssignCommand>();
		commands.RegisterCommands<BlacklistCommand>();
		commands.RegisterCommands<CloseCommand>();
		commands.RegisterCommands<CreateButtonPanelCommand>();
		commands.RegisterCommands<CreateSelectionBoxPanelCommand>();
		commands.RegisterCommands<ListAssignedCommand>();
		commands.RegisterCommands<ListCommand>();
		commands.RegisterCommands<ListOpen>();
		commands.RegisterCommands<ListUnassignedCommand>();
		commands.RegisterCommands<MoveCommand>();
		commands.RegisterCommands<NewCommand>();
		commands.RegisterCommands<RandomAssignCommand>();
		commands.RegisterCommands<RemoveCategoryCommand>();
		commands.RegisterCommands<RemoveMessageCommand>();
		commands.RegisterCommands<RemoveStaffCommand>();
		commands.RegisterCommands<SayCommand>();
		commands.RegisterCommands<SetSummaryCommand>();
		commands.RegisterCommands<StatusCommand>();
		commands.RegisterCommands<SummaryCommand>();
		commands.RegisterCommands<ToggleActiveCommand>();
		commands.RegisterCommands<TranscriptCommand>();
		commands.RegisterCommands<UnassignCommand>();
		commands.RegisterCommands<UnblacklistCommand>();
		commands.RegisterCommands<AdminCommands>();

		Logger.Log("Hooking command events...");
		commands.SlashCommandErrored += EventHandler.OnCommandError;

		Logger.Log("Connecting to Discord...");
		await discordClient.ConnectAsync();
	}
}