using Cysharp.Threading.Tasks;
using System;
using System.IO;
using System.Threading;
using UnityEngine;

namespace Periscope
{
    public static class PeriscopeManager
    {
        public static bool AutoRegime { get; private set; }

        public static PeriscopeConfig config;
        private static PeriscopeState state;
        private static CancellationTokenSource _gameCts;
        private static bool initialized = false;

        public static void Init(CancellationTokenSource gameCts)
        {
            _gameCts = gameCts;
            config = LoadConfigOrDefault();
            initialized = true;

            StopAllForce();
        }

        public static void UpManually()
        {
            if (!AutoRegime) Up();
        }
        public static void DownManually()
        {
            if (!AutoRegime) Down();
        }
        public static void StopManually()
        {
            if (!AutoRegime) Stop();
        }

        private static void Stop()
        {
            if (CanExecute(requiredState: PeriscopeState.Stopped))
            {
                var command = state switch
                {
                    PeriscopeState.MovingDown => config.StopDownCommand,
                    PeriscopeState.MovingUp => config.StopUpCommand,
                    _ => string.Empty,
                };

                if (string.IsNullOrEmpty(command)) StopAllForce();

                ComPortController.Send(command);
                state = PeriscopeState.Stopped;
            }
        }

        public static void StopAllForce()
        {
            if (!initialized) return;
            ComPortController.Send(config.StopUpCommand);
            ComPortController.Send(config.StopDownCommand);
            state = PeriscopeState.Stopped;
        }

        private static void Up()
        {
            if (CanExecute(requiredState: PeriscopeState.MovingUp))
            {
                ComPortController.Send(config.MoveUpCommand);
                state = PeriscopeState.MovingUp;
            }
        }

        private static void Down()
        {
            if (CanExecute(requiredState: PeriscopeState.MovingDown))
            {
                ComPortController.Send(config.MoveDownCommand);
                state = PeriscopeState.MovingDown;
            }
        }

        private static bool CanExecute(PeriscopeState requiredState) => initialized && state != requiredState;


        public static void MoveUpToEnd()
        {
            if (AutoRegime) return;
            MoveWithTiming(config.MoveUpCommand, config.MoveUpToEndTimeMs, _gameCts.Token).Forget();
        }

        public static void MoveCenter()
        {
            if (AutoRegime) return;
            MoveWithTiming(config.MoveDownCommand, config.MoveToCenterTimeMs, _gameCts.Token).Forget();
        }

        private static async UniTask MoveWithTiming(string moveCommand, int timeMs, CancellationToken token)
        {
            if (!initialized) return;
            AutoRegime = true;
            
            StopAllForce();
            await UniTask.Delay(20, cancellationToken: token);
            ComPortController.Send(moveCommand);
            await UniTask.Delay(timeMs, cancellationToken: token);
            StopAllForce();

            AutoRegime = false;
        }

        private static PeriscopeConfig LoadConfigOrDefault()
        {
            string fp = Path.Combine("Configs", "Periscope.json");
            PeriscopeConfig config;

            try
            {
                if (File.Exists(Path.Combine(Application.streamingAssetsPath, fp)))
                {
                    config = FileUtil.LoadJson<PeriscopeConfig>(fp, FileUtil.AppDirectory.Streaming).Data;
                    if (config != null) return config;
                }

                config = new PeriscopeConfig();
                FileUtil.SaveJson(fp, FileUtil.AppDirectory.Streaming, config);
                Debug.Log($"Создан новый Periscope с настройками по умолчанию и сохранен в {fp}");
            }
            catch (Exception ex)
            {
                Debug.LogError($"Ошибка при загрузке или создании ControllerDevice: {ex.Message}");
                config = new PeriscopeConfig();
            }
            return config;
        }

        [Serializable]
        public class PeriscopeConfig
        {
            //Команды
            public string MoveUpCommand = "2101";
            public string StopUpCommand = "2100";
            public string MoveDownCommand = "2111";
            public string StopDownCommand = "2110";

            //Тайминги
            public int MoveUpToEndTimeMs = 10000;
            public int MoveToCenterTimeMs = 3000;
        }

        public enum PeriscopeState
        {
            Stopped,
            MovingUp,
            MovingDown
        }
    }
}