using System;
using System.Collections;
using AibisDream.Framework;
using UnityEngine;

namespace AibisDream.FixSystem
{
    public class FixStateMachine
    {
        public FixState CurState => _curState.GetState;

        private IState _curState;
        private string _curArgs;

        public FixStateMachine()
        {
            // 初始化为一个默认状态
            _curState = CreateState(FixState.Default, "");
        }

        /// <summary>
        /// 播放诊所到场景的timeline
        /// </summary>
        /// <returns></returns>
        public IEnumerator PlayClinicCut()
        {
            yield return CameraKit.Instance.SwitchCamera(CameraEnum.CoolingMachine);
            yield return TimelineManager.Instance.PlayTimeline("ToBodyModule");
        }

        public IEnumerator SwitchState(FixState nextState, string args = "")
        {
            if (CurState == nextState) yield break;

            _curArgs = args;

            yield return _curState?.Exit();

            _curState = CreateState(nextState, _curArgs);

            EnumEventSystem.Global.Send(EventEnum.FixStateSwitch, nextState);
            yield return _curState.Enter();
        }

        public IEnumerator QuitState()
        {
            _curArgs = null;
            yield return _curState?.Exit();
            _curState = null;
        }

        private static IState CreateState(FixState nextState, string args)
        {
            IState res = nextState switch
            {
                FixState.Clinic => new ClinicState(),
                FixState.Engine => new EngineState(),
                FixState.BodyModule => new BodyModuleState(),
                FixState.Memory => new MemoryState(),
                FixState.Eye => new EyeState(),
                FixState.UF => new UfState(),
                FixState.Gear => new GearState(),
                _ => new ClinicState()
            };

            res.SetArgs(args);
            return res;
        }
    }

    public enum FixState
    {
        Default,
        Clinic,
        BodyModule,
        Memory,
        Eye,
        UF,
        Engine,
        Gear
    }

    public interface IState
    {
        public FixState GetState { get; }
        public void SetArgs(string args);
        public IEnumerator Enter();
        public IEnumerator Exit();
    }

    public struct ClinicState : IState
    {
        public FixState GetState => FixState.Clinic;

        public void SetArgs(string args)
        {
            // 无
        }

        public IEnumerator Enter()
        {
            // 切换相机
            // yield return CameraKit.Instance.SwitchCamera(CameraEnum.CoolingMachine);
            yield return CameraKit.Instance.SwitchCamera(CameraEnum.Clinic);
        }

        public IEnumerator Exit()
        {
            // 无
            yield break;
        }
    }

    public struct BodyModuleState : IState
    {
        private string _args;
        
        public FixState GetState => FixState.BodyModule;

        public void SetArgs(string args)
        {
            // 设置参数
            _args = args;
        }

        public IEnumerator Enter()
        {
            var bodyModuleSystem = FixSystemCenter.SystemDic.Get<BodyModuleSystem>();

            // 拔出插头
            bodyModuleSystem.ResetPlug();
            // 切换Body或Head
            if (Enum.TryParse<ModuleState>(_args, out var moduleState))
            {
                bodyModuleSystem.SwitchModuleGroup(moduleState);
            }
            
            // 切换相机
            yield return CameraKit.Instance.SwitchCamera(CameraEnum.BodyModule);
            // 开启交互
            bodyModuleSystem.EnableSystem();
        }

        public IEnumerator Exit()
        {
            var bodyModuleSystem = FixSystemCenter.SystemDic.Get<BodyModuleSystem>();
            // 拔出插头
            bodyModuleSystem.ResetPlug();
            // 关闭交互
            bodyModuleSystem.DisableSystem();
            yield break;
        }
    }


    public struct GearState : IState
    {
        public FixState GetState => FixState.Gear;

        private string _configKey;

        public void SetArgs(string args)
        {
            _configKey = args;
        }

        public IEnumerator Enter()
        {
            // 先切BodyModule
            if (!CameraKit.Instance.EqualToCameraState(CameraEnum.BodyModule))
            {
                // 先切BodyModule
                var bodyModule = FixSystemCenter.SystemDic.Get<BodyModuleSystem>();
                bodyModule.SwitchModuleGroup(ModuleState.Body);
                
                yield return MainUIController.Instance?.FadeInSync(0.5f);
                yield return CameraKit.Instance.SwitchCamera(CameraEnum.BodyModule);
                yield return MainUIController.Instance?.FadeOutSync(0.5f);
            }

            // 切换相机
            yield return CameraKit.Instance.SwitchCamera(CameraEnum.Gear);
            // 加载关卡数据
            if (!string.IsNullOrEmpty(_configKey))
            {
                var gearSystem = FixSystemCenter.SystemDic.Get<GearSystem>();
                gearSystem.CurDataKey = _configKey;
                gearSystem.LoadLevel();
            }
        }

        public IEnumerator Exit()
        {
            yield break;
        }
    }

    public struct EngineState : IState
    {
        public FixState GetState => FixState.Engine;

        public void SetArgs(string args)
        {
            // 无
        }

        public IEnumerator Enter()
        {
            // 先切BodyModule
            if (!CameraKit.Instance.EqualToCameraState(CameraEnum.BodyModule))
            {
                var bodyModule = FixSystemCenter.SystemDic.Get<BodyModuleSystem>();
                bodyModule.SwitchModuleGroup(ModuleState.Body);
                
                yield return CameraKit.Instance.SwitchCamera(CameraEnum.BodyModule);
            }

            // 切换相机
            yield return CameraKit.Instance.SwitchCamera(CameraEnum.Engine);
        }

        public IEnumerator Exit()
        {
            var bodyModuleSystem = FixSystemCenter.SystemDic.Get<BodyModuleSystem>();
            bodyModuleSystem.ResetPlug();
            yield break;
        }
    }

    public struct UfState : IState
    {
        public FixState GetState => FixState.UF;

        public void SetArgs(string args)
        {
        }

        public IEnumerator Enter()
        {
            var bodyModuleSystem = FixSystemCenter.SystemDic.Get<BodyModuleSystem>();
            var ufSystem = FixSystemCenter.SystemDic.Get<UFSystem>();
            var eyeSystem = FixSystemCenter.SystemDic.Get<EyeSystem>();
            // 先切BodyModule
            if (!CameraKit.Instance.EqualToCameraState(CameraEnum.BodyModule))
            {
                yield return CameraKit.Instance.SwitchCamera(CameraEnum.BodyModule);
            }

            // 插头回到初始插孔
            bodyModuleSystem.ResetPlug();
            // 切换相机
            yield return CameraKit.Instance.SwitchCamera(CameraEnum.UF);
            yield return MainUIController.Instance?.FadeInSync(0.5f);
            ufSystem.OpenUFView();
            yield return CameraKit.Instance.SwitchCamera(CameraEnum.EyeDeep);
            eyeSystem.OnEnter();
            yield return MainUIController.Instance?.FadeOutSync(0.5f);
        }

        public IEnumerator Exit()
        {
            float duration = 0.5f;
            var ufSystem = FixSystemCenter.SystemDic.Get<UFSystem>();
            var eyeSystem = FixSystemCenter.SystemDic.Get<EyeSystem>();
            yield return MainUIController.Instance?.FadeInSync(duration);
            eyeSystem.OnExit();
            ufSystem.CloseUFView();
            yield return CameraKit.Instance.SwitchCamera(CameraEnum.UF);
            yield return MainUIController.Instance?.FadeOutSync(duration);
            yield return null;
        }
    }

    public struct EyeState : IState
    {
        public FixState GetState => FixState.Eye;

        public void SetArgs(string args)
        {
        }

        public IEnumerator Enter()
        {
            //float duration = 0.5f;
            var bodyModuleSystem = FixSystemCenter.SystemDic.Get<BodyModuleSystem>();
            var eyeSystem = FixSystemCenter.SystemDic.Get<EyeSystem>();
            // 先切BodyModule
            if (!CameraKit.Instance.EqualToCameraState(CameraEnum.BodyModule))
            {
                yield return CameraKit.Instance.SwitchCamera(CameraEnum.BodyModule);
            }

            //打开盖子
            SpriteRenderer sp = bodyModuleSystem.FindBodyModuleByName("Eye").transform.Find("Cover")
                .GetComponent<SpriteRenderer>();
            sp.sprite = Resources.Load<Sprite>("Art/Fix/Peipei/Eye/视觉模块盖子打开A");
            yield return new WaitForSeconds(0.1f);
            sp.sprite = Resources.Load<Sprite>("Art/Fix/Peipei/Eye/视觉模块盖子打开B");
            // 插头回到初始插孔
            bodyModuleSystem.ResetPlug();
            // 切换相机
            yield return CameraKit.Instance.SwitchCamera(CameraEnum.Eye);
            yield return MainUIController.Instance?.FadeInSync(0.5f);
            yield return CameraKit.Instance.SwitchCamera(CameraEnum.EyeDeep);
            eyeSystem.OnEnter();
            yield return MainUIController.Instance?.FadeOutSync(0.5f);
        }

        public IEnumerator Exit()
        {
            var bodyModuleSystem = FixSystemCenter.SystemDic.Get<BodyModuleSystem>();
            float duration = 0.5f;
            var eyeSystem = FixSystemCenter.SystemDic.Get<EyeSystem>();
            yield return MainUIController.Instance?.FadeInSync(duration);
            yield return CameraKit.Instance.SwitchCamera(CameraEnum.Eye);
            eyeSystem.OnExit();
            yield return new WaitForSeconds(0.1f);
            yield return MainUIController.Instance?.FadeOutSync(duration);
            //关上
            SpriteRenderer sp = bodyModuleSystem.FindBodyModuleByName("Eye").transform.Find("Cover")
                .GetComponent<SpriteRenderer>();
            sp.sprite = Resources.Load<Sprite>("Art/Fix/Peipei/Eye/视觉模块盖子打开A");
            yield return new WaitForSeconds(0.1f);
            sp.sprite = Resources.Load<Sprite>("Art/Fix/Peipei/Eye/视觉模块盖子关闭");
            yield return new WaitForSeconds(0.5f);
        }
    }

    public struct MemoryState : IState
    {
        public FixState GetState => FixState.Memory;

        public void SetArgs(string args)
        {
        }

        public IEnumerator Enter()
        {
            float duration = 0.5f;
            var bodyModuleSystem = FixSystemCenter.SystemDic.Get<BodyModuleSystem>();
            var memorySystem = FixSystemCenter.SystemDic.Get<MemoryProcess>();
            // 先切BodyModule
            if (!CameraKit.Instance.EqualToCameraState(CameraEnum.BodyModule))
            {
                yield return CameraKit.Instance.SwitchCamera(CameraEnum.BodyModule);
            }

            yield return memorySystem.DropMemoryProjector();
            // 插头回到初始插孔
            bodyModuleSystem.ResetPlug();
            // 相机聚焦到目标位
            yield return CameraKit.Instance.SwitchCamera(CameraEnum.Memory);
            yield return MainUIController.Instance?.FadeInSync(0.5f);
            memorySystem.OnEnter();
            yield return MainUIController.Instance.FadeOutSync(duration);
        }

        public IEnumerator Exit()
        {
            float duration = 0.5f;
            var memorySystem = FixSystemCenter.SystemDic.Get<MemoryProcess>();
            yield return MainUIController.Instance.FadeInSync(duration);
            memorySystem.OnExit();
            memorySystem.CloseMemoryView();
            yield return MainUIController.Instance.FadeOutSync(duration);
            yield return CameraKit.Instance.SwitchCamera(CameraEnum.BodyModule);
            memorySystem.PullMemoryProjector();
        }
    }
}