using System;
using ECM2;
using RootMotion.FinalIK;
using UnityEngine;

namespace NBF
{
    public class PlayerCharacter : Character
    {
        private float _cameraPitch;
        private FPlayer _player;
        private float _defBackSpineZ;

        [HideInInspector] public int nextShowSlotIndex = -1;


        public GameObject cameraParent;
        [Space(15.0f)] public bool invertLook = true;
        [Tooltip("视角旋转敏感度")] public Vector2 sensitivity = new Vector2(0.05f, 0.05f);

        [Space(15.0f)] public float minPitch = -80.0f;
        public float maxPitch = 80.0f;

        [Tooltip("手上下最大角度")] public Vector2 handMaxAngle = new Vector2(0, 0);

        public bool IsSelf;

        private Quaternion spineInitialLocalRotation;


        public LookAtIK lookAtIK; // 挂在背部上的 LookAtIK 脚本
        public float aimDistance = 1.5f; // 目标点离相机多远

        private Transform lookTarget; // 实际目标点
        [Header("限制角度（单位：度）")] public float maxUpAngle = 20f; // 相机抬头最多20°
        public float maxDownAngle = 40f; // 相机低头最多40°

        protected override void Start()
        {
            base.Start();

            // 创建一个动态目标点对象，避免你每次动态生成
           
            lookAtIK = GetComponent<LookAtIK>();
            _player = GetComponent<FPlayer>();
            IsSelf = _player.Data.PlayerID == GameModel.RoleID;
            cameraParent = _player.CameraRoot.gameObject;
            if (IsSelf)
            {
                camera = BaseCamera.Main;
            }

            lookTarget = new GameObject("SpineLookTarget").transform;
            lookTarget.SetParent(_player.transform);
            
            spineInitialLocalRotation = _player.BackSpine.localRotation;
            _defBackSpineZ = -AnglesChange(_player.BackSpine.localEulerAngles.z);
            transform.position = _player.Data.position;
            transform.rotation = _player.Data.rotation;

            App.Inst.SetMouseCurrsor(false);

            InputManager.OnQuickIndexAction += OnQuickIndexAction;
            InputManager.OnUseTorchAction += OnUseTorchAction;
            InputManager.OnUseTelescopeAction += OnUseTelescopeAction;
        }

        private void Update()
        {
            UpdatePlayerPositionAndRotation();
            UpdateGear();
        }

        protected virtual void LateUpdate()
        {
            UpdateCameraParentRotation();
            UpdatePlayerHandView();
        }


        protected override void Reset()
        {
            base.Reset();
            SetRotationMode(RotationMode.None);
        }

        private void OnDestroy()
        {
            InputManager.OnQuickIndexAction -= OnQuickIndexAction;
            InputManager.OnUseTorchAction -= OnUseTorchAction;
            InputManager.OnUseTelescopeAction -= OnUseTelescopeAction;
        }

        #region 肩膀控制

        private void UpdatePlayerHandView()
        {
            Vector3 cameraForward = cameraTransform.forward;
            Vector3 flatForward = Vector3.ProjectOnPlane(cameraForward, Vector3.up).normalized;

            // 获取相机 pitch 角度（负值是上看，正值是下看）
            float pitchAngle = Vector3.SignedAngle(flatForward, cameraForward, cameraTransform.right);

            // 限制 pitch 角度
            pitchAngle = Mathf.Clamp(pitchAngle, -maxUpAngle, maxDownAngle);

            // 重新构造限制后的目标方向
            Quaternion limitedPitch = Quaternion.AngleAxis(pitchAngle, cameraTransform.right);
            Vector3 limitedDirection = limitedPitch * flatForward;

            // 设置目标点
            lookTarget.position = cameraTransform.position + limitedDirection * aimDistance;
            lookAtIK.solver.target = lookTarget;
        }

        #endregion

        #region 钓组控制

        private void UpdateGear()
        {
            if (_player.CanChangeGear())
            {
                if (nextShowSlotIndex > 0)
                {
                    Debug.LogError("切换钓组=========");
                    var data = Fishing.Inst.Datasource;
                    data.SetSelfTestGear(nextShowSlotIndex);
                    nextShowSlotIndex = -1;
                }
            }
        }

        #endregion

        #region 角色位移和旋转控制

        private void UpdatePlayerPositionAndRotation()
        {
            // Move
            Vector2 movementInput = InputManager.GetMovementInput();

            Vector3 movementDirection = Vector3.zero;

            movementDirection += Vector3.forward * movementInput.y;
            movementDirection += Vector3.right * movementInput.x;

            movementDirection =
                movementDirection.relativeTo(cameraTransform, GetUpVector());

            SetMovementDirection(movementDirection);

            // Look
            Vector2 lookInput = InputManager.GetLookInput() * sensitivity;

            AddControlYawInput(lookInput.x);
            AddControlPitchInput(invertLook ? -lookInput.y : lookInput.y, minPitch, maxPitch);
        }

        /// <summary>
        /// 添加输入（影响偏航）。
        /// 此操作应用于角色的旋转。
        /// </summary>
        public virtual void AddControlYawInput(float value)
        {
            if (value != 0.0f)
                AddYawInput(value);
        }

        /// <summary>
        /// 添加输入（影响俯仰）。
        /// 此操作应用于相机父级的本地旋转。
        /// </summary>
        public virtual void AddControlPitchInput(float value, float minPitch = -80.0f, float maxPitch = 80.0f)
        {
            if (value != 0.0f)
                _cameraPitch = MathLib.ClampAngle(_cameraPitch + value, minPitch, maxPitch);
        }

        /// <summary>
        /// 根据当前的 _cameraPitch 值更新 cameraParent 的本地旋转。
        /// </summary>
        protected virtual void UpdateCameraParentRotation()
        {
            cameraParent.transform.localRotation = Quaternion.Euler(_cameraPitch, 0.0f, 0.0f);
        }

        #endregion

        #region 按键输入事件

        private void OnQuickIndexAction(int index)
        {
            nextShowSlotIndex = index;
        }

        private void OnUseTorchAction(bool ret)
        {
            if (!ret)
            {
                _player.Data.openLight = !_player.Data.openLight;
            }
        }

        private void OnUseTelescopeAction(bool ret)
        {
            if (!ret)
            {
                _player.Data.openTelescope = !_player.Data.openTelescope;
                _player.ToggleTelescope();
            }
        }

        #endregion

        #region 工具方法

        float GetCameraPitch()
        {
            Vector3 camForward = cameraParent.transform.forward;
            camForward.y = 0;
            camForward.Normalize();
            float pitch = Vector3.SignedAngle(camForward, cameraParent.transform.forward, cameraParent.transform.right);
            return pitch;
        }

        private float AnglesChange(float angle)
        {
            return (angle > 180f) ? angle - 360f : angle;
        }

        #endregion
    }
}