using UnityEngine;
using UnityEngine.InputSystem;
using Cinemachine;
using Touch = UnityEngine.InputSystem.EnhancedTouch.Touch;
using BITKit.IO;
using Newtonsoft.Json;
using System.IO;
using Cysharp.Threading.Tasks;
using UnityEngine.InputSystem.Controls;

namespace BITKit
{
    public class SimpleCameraLook : MonoBehaviour
    {
        private string fileName => Path.Combine(Utility.Path.persistentDataPath, gameObject.scene.name, $"{gameObject.GetInstanceID()}.bit");
        public enum State
        {
            Mouse,
            Touchscreen,
        }
        [Header(Constant.Header.Gameobjects)]
        public Transform cameraRoot;
        public CinemachineVirtualCamera virtualCamera;
        [Header(Constant.Header.Settings)]
        public TransformMode touchMode;
        [Header(Constant.Header.Settings)]
        public InputActionReference viewAction;
        public InputActionReference movementAction;
        public InputActionReference adsAction;
        public InputActionReference entryAction;
        public InputActionReference entryMoveAction;
        public InputActionGroup inputGroup = new();
        [Header(Constant.Header.Settings)]
        public float minEntrySqrMagnitude = 1;
        public LayerMask layerMask;
        [Header(Constant.Header.Settings)]
        public AnimationCurve scollCurve = new();
        public AnimationCurve moveCurve = new();
        public AnimationCurve touchMoveCurve = new();
        public Vector2 cameraDistanceLimit = new(1, 64);
        [Header(Constant.Header.Providers)]
        [SerializeField,SerializeReference,SubclassSelector] private ICondition allowInput;
        [Header(Constant.Header.Debug)]
        public int touchesCount;
        public bool isParallelVector;
        [Header(Constant.Header.InternalVariables)]
        public Vector3 lookInput;
        public Vector3 moveVector;
        public ValidHandle freeLooking = new();
        public ValidHandle moving = new();
        private Cinemachine3rdPersonFollow tpv;
        private Location startLocation;
        private Location savedLocation;
        private float savedDistance;
        private float startDistance;
        private CinemachineBrain _brain;

        public Vector3 Position
        {
            get=>cameraRoot.position;
            set=>cameraRoot.position = value;
        }
        public void Reset()
        {
            lookInput = MathV.TransientRotationAxis(startLocation.position);
            cameraRoot.position = startLocation;
            tpv.CameraDistance = startDistance;
        }
        public void DisableInput(bool disable)
        {
            inputGroup.allowInput.SetDisableElements(nameof(DisableInput), disable);
        }
        public void SetTouchMode(int index)
        {
            SetTouchMode((TransformMode)index);
        }
        public void SetTouchMode(TransformMode mode)
        {
            touchMode = mode;
        }

        public void SetViewScale(float value)
        {
            tpv.CameraDistance = value;
        }

        public float GetViewScale() => tpv.CameraDistance;
        public void Align(Transform target)
        {
            if (target.TryGetComponent<SimpleCameraLook>(out var x))
            {
                cameraRoot.position = x.cameraRoot.position;
                //lookInput = x.lookInput;
                lookInput = MathV.TransientRotationAxis(x.cameraRoot.rotation.eulerAngles);
                if (x.tpv)
                    tpv.CameraDistance = x.tpv.CameraDistance;
            }
            else if (target.TryGetComponent<CinemachineVirtualCamera>(out var vCam))
            {
                cameraRoot.position = vCam.Follow.position;
                lookInput = MathV.TransientRotationAxis(vCam.LookAt.rotation.eulerAngles);
                var e = vCam.GetCinemachineComponent<Cinemachine3rdPersonFollow>();
                if (e)
                {
                    tpv.CameraDistance = e.CameraDistance;
                }

            }
            else
            {
                cameraRoot.position = target.position;
                lookInput = MathV.TransientRotationAxis(target.eulerAngles);
            }
        }
        public void Align(Vector3 position)=>cameraRoot.position= position;
        public void SaveLocation()
        {
            savedLocation = new(cameraRoot);
            savedDistance = tpv.CameraDistance;
            BITAssets.Build(
                PathHelper.GetFilePath(fileName),
                new IAsset[]
                {
                    new BITAsset(nameof(savedLocation),JsonUtility.ToJson(savedLocation)),
                    new BITAsset(nameof(savedDistance),JsonConvert.SerializeObject(savedDistance)),
                }
            );
        }
        public void LoadLocation()
        {
            lookInput = MathV.TransientRotationAxis(savedLocation.rotation.eulerAngles);
            cameraRoot.position = savedLocation;
            tpv.CameraDistance = savedDistance;
        }

        private void Awake()
        {
            freeLooking.AddListener(OnFreeLook);
            tpv = virtualCamera.GetCinemachineComponent<Cinemachine3rdPersonFollow>();

            savedLocation = startLocation = new(cameraRoot);
            savedDistance = startDistance = tpv.CameraDistance;

            inputGroup.RegisterCallback(viewAction, OnView);
            inputGroup.RegisterCallback(movementAction, OnMovement);
            inputGroup.RegisterCallback(adsAction, OnAds);
            inputGroup.RegisterCallback(entryAction, OnEntry);
            inputGroup.RegisterCallback(entryMoveAction, OnEntryMoveAction);

            if (Camera.main != null) _brain = Camera.main.GetComponent<CinemachineBrain>();
        }

        private async void Start()
        {
            var fileName = this.fileName;
            await UniTask.SwitchToThreadPool();
            if (File.Exists(fileName))
            {
                savedLocation = BITAssets.Read<Location>(fileName, nameof(savedLocation));
                savedDistance = BITAssets.Read<float>(fileName, nameof(savedDistance));
            }
        }

        private void OnEnable()
        {
            SetEnabled(true);
            lookInput = MathV.TransientRotationAxis(cameraRoot.eulerAngles);

            freeLooking.RemoveDisableElements(this);

            if (virtualCamera is not null)
                virtualCamera.enabled = true;
        }

        private void OnDisable()
        {
            SetEnabled(false);
            freeLooking.AddDisableElements(this);

            if (virtualCamera is not null)
                virtualCamera.enabled = false;
        }

        private void OnDestroy()
        {
            inputGroup.Dispose();
        }

        private void SetEnabled(bool enabled)
        {
            //BIT4Log.Log<SimpleCameraLook>($"正在设置输入状态:{enabled}");
            BITAppForUnity.AllowTouchSupport.SetElements(this, enabled);
            inputGroup.allowInput.SetElements(this, enabled);
        }

        private void Update()
        {
            //var debuger = DI.Get<IDebuger>();
            var playerConfig = PlayerConfig.singleton;
            var sensitivity = playerConfig.touchSensitivity;

            //debuger.Log(nameof(Touch.activeTouches), Touch.activeTouches.Count.ToString());
            touchesCount = Touch.activeTouches.Count;

            if (Mouse.current is not null && Mouse.current.leftButton.wasPressedThisFrame)
            {
                var ray = Camera.main.ScreenPointToRay(Mouse.current.position.ReadValue());
                if (Physics.Raycast(ray, out var raycast, 256, layerMask))
                {
                    cameraRoot.position = raycast.point;
                }
            }

            if (_brain)
            {
                inputGroup.allowInput.SetDisableElements(nameof(CinemachineBrain),virtualCamera != (CinemachineVirtualCamera)_brain.ActiveVirtualCamera);
            }
        }

        private void LateUpdate()
        {
            lookInput.x = Mathf.Clamp(lookInput.x, -80, 80);
            var newRotation = Quaternion.Euler(lookInput);
            cameraRoot.rotation = Quaternion.Lerp(cameraRoot.rotation, newRotation, 48 * Time.deltaTime);
            var offset = cameraRoot.localRotation * moveVector;
            cameraRoot.localPosition -= offset * Time.deltaTime;
        }

        private void OnView(InputAction.CallbackContext context)
        {
            if (allowInput.OnCheck() is false) return;
            var playerConfig = PlayerConfig.singleton;
            var sensitivity = playerConfig.sensitivity * playerConfig.m_yaw;
            var delta = context.ReadValue<Vector2>();
            switch (context.control.device)
            {
                case Mouse mouse:
                    if (freeLooking && !moving)
                    {
                        lookInput.x -= delta.y * sensitivity;
                        lookInput.y += delta.x * sensitivity;
                    }
                    break;
                case Touchscreen touchscreen:
                    switch (touchMode)
                    {
                        case TransformMode.Move:
                            break;
                        case TransformMode.Rotate:
                            lookInput.x -= delta.y * sensitivity;
                            lookInput.y += delta.x * sensitivity;
                            moveVector = default;
                            break;
                        case TransformMode.Scale:
                            break;
                    }
                    if (touchMode is TransformMode.Scale)
                    {
                        OnAds(context);
                    }
                    break;
            }
        }

        private void OnAds(InputAction.CallbackContext context)
        {
            try
            {
                BITAppForUnity.ThrowIfWindowNotFocus();
                switch (context.control.device)
                {
                    case Mouse mouse:
                        OnAds(context.ReadValue<Vector2>().y);
                        break;
                    case Touchscreen touchscreen:
                        /*   lookInput.x -= delta.y * sensitivity;
                          lookInput.y += delta.x * sensitivity; */
                        switch (touchMode)
                        {
                            case TransformMode.Move:
                                break;
                            case TransformMode.Rotate:
                                moveVector = default;
                                break;
                            case TransformMode.Scale:
                                OnAds(context.ReadValue<Vector2>().y);
                                break;
                        }
                        break;
                }
            }
            catch (MouseNotOverGameViewException)
            {

            }
        }

        private void OnAds(float delta)
        {
            var newDistance = tpv.CameraDistance -
                  delta * Time.deltaTime * scollCurve.Evaluate(tpv.CameraDistance);
            tpv.CameraDistance = Mathf.Clamp(newDistance, cameraDistanceLimit.x, cameraDistanceLimit.y);
        }

        private void OnFreeLook(bool active)
        {
            BITAppForUnity.AllowCursor.SetDisableElements(this, active);
        }

        private void OnEntry(InputAction.CallbackContext context)
        {
            if (context.started)
            {
                var delta = viewAction.action.ReadValue<Vector2>();
                if (delta.sqrMagnitude > minEntrySqrMagnitude)
                    freeLooking.AddElement(this);
            }
            else if (context.canceled)
            {
                freeLooking.RemoveElement(this);
            }
        }

        private void OnMovement(InputAction.CallbackContext context)
        {
            switch (context.control.device)
            {
                case Mouse mouse:
                    if (moving && freeLooking)
                    {
                        moveVector = context.ReadValue<Vector2>() * moveCurve.Evaluate(tpv.CameraDistance);
                    }
                    break;
                case Touchscreen touchscreen:
                    /*   lookInput.x -= delta.y * sensitivity;
                      lookInput.y += delta.x * sensitivity; */
                    switch (touchMode)
                    {
                        case TransformMode.Move:
                            moveVector = context.ReadValue<Vector2>() * moveCurve.Evaluate(tpv.CameraDistance);
                            break;
                        case TransformMode.Rotate:
                            break;
                        case TransformMode.Scale:
                            break;
                    }
                    break;
            }
            if (context.canceled)
            {
                moveVector = default;
            }
        }

        private void OnEntryMoveAction(InputAction.CallbackContext context)
        {

            if (context.started)
            {
                moving.AddElement(this);
            }
            else if (context.canceled)
            {
                moving.RemoveElement(this);
            }
        }
    }
}