using System.Reflection;
using Discord;
using DiscordBotsList.Api;
using DiscordBotsList.Api.Objects;
using Discord.Interactions;
using Discord.WebSocket;
using Microsoft.Extensions.DependencyInjection;

namespace UNO
{
    class Program
    {
        static void Main(string[] args) =>
            new Program().MainAsync().GetAwaiter().GetResult();

        private DiscordShardedClient _client;

        private InteractionService _commands;

        private IServiceProvider _services;

        private IDblSelfBot _dblApi;

        public async Task MainAsync()
        {
            _services = ConfigureServices();

            _client = _services.GetRequiredService<DiscordShardedClient>();

            _commands = _services.GetRequiredService<InteractionService>();

            // Initialize the Top.gg (Discord Bots List api)
            if (Config.USE_TOP_GG_API)
            {
                var discordBotList =
                    new AuthDiscordBotListApi(Config.BOT_CLIENT_ID,
                        System
                            .Environment
                            .GetEnvironmentVariable("UnoDblToken"));
                _dblApi = await discordBotList.GetMeAsync();
            }

            // Add the public modules that inherit InteractionModuleBase<T> to the InteractionService
            await _commands
                .AddModulesAsync(Assembly.GetEntryAssembly(), _services);

            _client.Log += LogAsync;
            _commands.Log += LogAsync;

            await _client
                .LoginAsync(TokenType.Bot,
                Config.IS_DEBUG
                    ? System.Environment.GetEnvironmentVariable("TestBotToken")
                    : System
                        .Environment
                        .GetEnvironmentVariable("UnoDiscordBotToken"));
            await _client.StartAsync();

            _client.InteractionCreated += OnInteractionCreated;
            _client.ShardReady += OnReady;
            _client.JoinedGuild += OnJoinedGuild;
            _client.LeftGuild += OnLeftGuild;

            await Task.Delay(Timeout.Infinite);
        }

        private async Task UpdateBotStatus()
        {
            Console.WriteLine("Updating guild count...");

            var totalGuilds = _client.Shards.Sum(x => x.Guilds.Count);

            // Update Bot Status
            await _client.SetGameAsync($"/uno on {totalGuilds} servers");

            // Update Top.gg Server Count
            if (Config.USE_TOP_GG_API && !Config.IS_DEBUG)
                await _dblApi.UpdateStatsAsync(totalGuilds);
        }

        private async Task OnLeftGuild(SocketGuild arg) =>
            await UpdateBotStatus();

        private async Task OnJoinedGuild(SocketGuild arg) =>
            await UpdateBotStatus();

        private async Task OnReady(DiscordSocketClient arg)
        {
            // Uncomment this to register commands (should only be run once, not everytime it starts)
            // Comment it out again after registering the commands
            //await _commands.RegisterCommandsGloballyAsync();
            if (Config.IS_DEBUG)
            {
                Console.WriteLine("\n\nWARNING: Running in debug mode.\n\n");
                await _commands
                    .RegisterCommandsToGuildAsync(Config.DEBUG_GUILD_ID);
            }
        }

        private async Task OnInteractionCreated(SocketInteraction interaction)
        {
            try
            {
                // Create an execution context that matches the generic type parameter of
                // the InteractionModuleBase<T> module
                var ctx = new ShardedInteractionContext(_client, interaction);
                await _commands.ExecuteCommandAsync(ctx, _services);
            }
            catch (Exception e)
            {
                Console.WriteLine (e);
            }
        }

        private Task LogAsync(LogMessage log)
        {
            Console.WriteLine(log.ToString());
            return Task.CompletedTask;
        }

        ServiceProvider ConfigureServices()
        {
            return new ServiceCollection()
                .AddSingleton<DiscordShardedClient>(x =>
                    new DiscordShardedClient(new DiscordSocketConfig {
                            LogLevel = LogSeverity.Info,
                            GatewayIntents = GatewayIntents.Guilds,
                            TotalShards = Config.DISCORD_SHARD_COUNT
                        }))
                .AddSingleton(x =>
                    new InteractionService(x
                            .GetRequiredService<DiscordShardedClient>()))
                .AddSingleton<GameManager>()
                .BuildServiceProvider();
        }
    }
}