using System;
using System.Linq;
using System.Threading;
using Cysharp.Threading.Tasks;
using R3;
using RebootKit.Engine.Extensions;
using RebootKit.Engine.Main;
using RebootKit.Engine.Services.Console;
using RebootKit.Engine.Services.Crosshair;
using RebootKit.Engine.Services.GameMode;
using RebootKit.Engine.Services.Simulation;

namespace RealityReboot.jelycho {
    public static class JelychoConsoleCommands {
        [RCCMD("start", "Starts game mode with given name. Usage: start <game_mode_name> <world_name>")]
        public static void StartGameMode(string[] args) {
            if (args.Length != 3) {
                RR.Console.WriteToOutput($"Usage: {args[0]} <game_mode_name> <world_name>");
                return;
            }

            string worldName = args[2];
            WorldConfigAsset worldConfig = RR.WorldConfigsAssets.FirstOrDefault(t => t.Config.name.Equals(worldName));
            if (worldConfig is null) {
                RR.Console.WriteToOutput($"World '{worldName}' not found");
                return;
            }

            foreach (GameModeAsset gameModeAsset in RR.GameModesAssets) {
                if (gameModeAsset.name == args[1]) {
                    RR.Console.WriteToOutput($"Starting game mode '{gameModeAsset.name}'");
                    RR.StartGameMode(gameModeAsset, worldConfig.Config);
                    return;
                }
            }

            RR.Console.WriteToOutput($"Game mode '{args[1]}' not found");
        }

        [RCCMD("gamemodes", "Lists all game modes")]
        public static void GameModes(string[] args) {
            if (args.Length != 1) {
                RR.Console.WriteToOutput($"Usage: {args[0]}");
                return;
            }

            RR.Console.WriteToOutput("Game modes:");
            foreach (GameModeAsset gameModeAsset in RR.GameModesAssets) {
                RR.Console.WriteToOutput($"  {gameModeAsset.name}");
            }
        }
        
        [RCCMD("worlds", "Lists all worlds")]
        public static void Worlds(string[] args) {
            if (args.Length != 1) {
                RR.Console.WriteToOutput($"Usage: {args[0]}");
                return;
            }

            RR.Console.WriteToOutput("Worlds:");
            foreach (WorldConfigAsset worldConfigAsset in RR.WorldConfigsAssets) {
                RR.Console.WriteToOutput($"  {worldConfigAsset.Config.name}");
            }
        }
    }

    public class JelychoGame : IGame {
        [Serializable]
        public class Config {
            public WorldConfigAsset mainMenuWorldConfig;
            public GameModeAsset standardGameMode;

            public WorldConfigAsset worldAstek;
        }

        readonly Config m_Config;

        DisposableBag m_DisposableBag;

        public JelychoGame(Config config) {
            m_Config = config;
            m_DisposableBag = new DisposableBag();
        }

        public async UniTask InitAsync(CancellationToken cancellationToken) {
            RR.CreateService<CrosshairService>();
            await UniTask.Yield();
        }

        public void Run() {
            RR.GameModes.ActiveGameMode.Subscribe(gameMode => {
                  if (gameMode == null) {
                      RR.Console.WriteToOutput("Game mode stopped, loading main menu world");
                      RR.World.LoadAsync(m_Config.mainMenuWorldConfig.Config, CancellationToken.None).Forget();
                  }
              })
              .AddTo(ref m_DisposableBag);
        }

        public void Dispose() {
            m_DisposableBag.Dispose();
        }

        public void NewGame() {
            RR.StartGameMode(m_Config.standardGameMode, m_Config.worldAstek.Config);
        }
    }
}