using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Serialization;

namespace CustomTool
{
    public class CameraController : MonoBehaviour
    {
        #region 私有变量

        /// <summary>
        /// 是否可穿碰撞器
        /// </summary>
        [Header("是否开启穿透检测")]
        [SerializeField]
        private bool m_IsCouldCrossCollider;

        /// <summary>
        /// 是否限定相机的移动区域
        /// </summary>
        [Header("是否开启区域限定")]
        [SerializeField]
        private bool m_IsLimitArea = false;

        /// <summary>
        /// 是否绘制区域效果
        /// </summary>
        [Header("是否绘制限制区域效果")]
        [SerializeField]
        private bool m_IsDragAreaEffect = false;

        /// <summary>
        /// 全场景区域限定最小点
        /// </summary>
        [Header("大范围限制区域")]
        [SerializeField]
        private Transform m_SceneMinPoint;

        /// <summary>
        /// 全场景区域限定最大点
        /// </summary>
        [SerializeField]
        private Transform m_SceneMaxPoint;

        /// <summary>
        /// 相机移动速度
        /// </summary>
        [Header("相机相关参数")]
        [SerializeField]
        private float m_MoveSpeed = 10f;

        /// <summary>
        /// X轴视角旋转速度
        /// </summary>
        [SerializeField]
        private float m_XSpeed = 250.0f;

        /// <summary>
        /// Y轴视角旋转速度
        /// </summary>
        [SerializeField]
        private float m_YSpeed = 120.0f;

        /// <summary>
        /// 鼠标中间滚轮的拉近拉远速度
        /// </summary>
        [SerializeField]
        private float m_MouseSpeed = 60f;

        /// <summary>
        /// 视角旋转向下最小限制
        /// </summary>
        [SerializeField]
        private float m_YMinLimit = -20;

        /// <summary>
        /// 视角旋转向上最大限制
        /// </summary>
        [SerializeField]
        private float m_YMaxLimit = 80;

        /// <summary>
        /// 鼠标中键移动速度限制
        /// </summary>
        [SerializeField]
        public float m_SpeedLimit = 0.2f;

        private float xMin, xMax, yMin, yMax, zMin, zMax; // 相机的移动范围

        private float m_MoveX;
        private float m_MoveY;
        private float m_MoveZ = 0;
        private float m_AngleX = 0.0f;
        private float m_AngleY = 0.0f;

        #endregion

        [Serializable]
        public struct LimitArea
        {
            /// <summary>
            /// 房屋区域的最小点
            /// </summary>
            public Transform minPoint;

            /// <summary>
            /// 房屋区域的最大点
            /// </summary>
            public Transform maxPoint;
        }

        /// <summary>
        /// 房屋区域的数组
        /// </summary>
        [FormerlySerializedAs("houseAreas")]
        [Header("不可穿透区域")]
        [SerializeField]
        private LimitArea[] m_LimitAreas = null;

        private void Awake()
        {
            ResetInfo();
            SetCameraInitData();

            SetCameraPosLimite(m_SceneMinPoint.position, m_SceneMaxPoint.position);
        }

        void Update()
        {
            HandleKeyboardInput();
            HandleMouseInput();
            RotateView();
            ViewScale();
        }

        /// <summary>
        /// 重置位置信息
        /// </summary>
        public void ResetInfo()
        {
            var angles = transform.eulerAngles;
            m_AngleX = angles.y;
            m_AngleY = angles.x;
        }

        /// <summary>
        /// 相机移动
        /// </summary>
        private void HandleKeyboardInput()
        {
            // 键盘输入
            m_MoveX = Input.GetAxis("Horizontal") * m_MoveSpeed * Time.deltaTime;
            m_MoveY = Input.GetAxis("Vertical") * m_MoveSpeed * Time.deltaTime;
            float moveZ = 0;

            // 上移和下移键
            if (Input.GetKey(KeyCode.E))
            {
                moveZ = m_MoveSpeed * Time.deltaTime;
            }
            else if (Input.GetKey(KeyCode.Q))
            {
                moveZ = -m_MoveSpeed * Time.deltaTime;
            }

            Vector3 move = new Vector3(m_MoveX, moveZ, m_MoveY);
            Vector3 movePos = transform.position + transform.TransformDirection(move);

            if (m_IsLimitArea)
            {
                // 限制相机在指定区域内移动
                movePos.x = Mathf.Clamp(movePos.x, xMin, xMax);
                movePos.y = Mathf.Clamp(movePos.y, yMin, yMax);
                movePos.z = Mathf.Clamp(movePos.z, zMin, zMax);
            }

            if (m_IsCouldCrossCollider)
            {
                // 检查并调整相机位置
                foreach (LimitArea item in m_LimitAreas)
                {
                    if (IsInsideHouse(movePos, item))
                    {
                        movePos = AdjustPositionOutsideHouse(movePos, item);
                    }
                }
            }

            transform.position = movePos;
        }

        /// <summary>
        /// 鼠标中键控制相机移动
        /// </summary>
        private void HandleMouseInput()
        {
            // 鼠标中键控制移动
            if (Input.GetMouseButton(2))
            {
                float mouseX = Input.GetAxis("Mouse X") * m_MoveSpeed * Time.deltaTime;
                float mouseY = Input.GetAxis("Mouse Y") * m_MoveSpeed * Time.deltaTime;

                Vector3 move = new Vector3(mouseX, 0, mouseY);
                Vector3 movePos = transform.position + transform.TransformDirection(move);

                if (m_IsLimitArea)
                {
                    // 限制相机在指定区域内移动
                    movePos.x = Mathf.Clamp(movePos.x, xMin, xMax);
                    movePos.y = Mathf.Clamp(movePos.y, yMin, yMax);
                    movePos.z = Mathf.Clamp(movePos.z, zMin, zMax);
                }

                if (m_IsCouldCrossCollider)
                {
                    // 检查并调整相机位置
                    foreach (LimitArea item in m_LimitAreas)
                    {
                        if (IsInsideHouse(movePos, item))
                        {
                            movePos = AdjustPositionOutsideHouse(movePos, item);
                        }
                    }
                }

                transform.position = movePos;
            }
        }

        /// <summary>
        /// 鼠标右键控制视角旋转
        /// </summary>
        private void RotateView()
        {
            if (Input.GetMouseButton(1))
            {
                if (Input.GetAxis("Mouse X") != 0 || Input.GetAxis("Mouse Y") != 0)
                {
                    m_AngleX += Input.GetAxis("Mouse X") * m_XSpeed * 0.02f;
                    m_AngleY -= Input.GetAxis("Mouse Y") * m_YSpeed * 0.02f;
                    m_AngleY = ClampAngle(m_AngleY, m_YMinLimit, m_YMaxLimit);
                    var rotation = Quaternion.Euler(m_AngleY, m_AngleX, 0);
                    transform.rotation = rotation;
                }
            }
        }

        /// <summary>
        /// 滑轮控制视角移动
        /// </summary>
        private void ViewScale()
        {
            if (Input.GetAxis("Mouse ScrollWheel") != 0)
            {
                // 鼠标滚轮控制相机距离
                Vector3 scrollMove = transform.forward * (Input.GetAxis("Mouse ScrollWheel") * m_MouseSpeed * Time.deltaTime);
                Vector3 movePos = transform.position + scrollMove;

                if (m_IsLimitArea)
                {
                    movePos.x = Mathf.Clamp(movePos.x, xMin, xMax);
                    movePos.y = Mathf.Clamp(movePos.y, yMin, yMax);
                    movePos.z = Mathf.Clamp(movePos.z, zMin, zMax);
                }

                if (m_IsCouldCrossCollider)
                {
                    // 检查并调整相机位置
                    foreach (LimitArea item in m_LimitAreas)
                    {
                        if (IsInsideHouse(movePos, item))
                        {
                            movePos = AdjustPositionOutsideHouse(movePos, item);
                        }
                    }
                }

                transform.position = movePos;
            }
        }

        /// <summary>
        /// 跳转到对应内部区域
        /// </summary>
        /// <param name="_targetPosition">目标位置</param>
        /// <param name="_minPoint">房间最小点</param>
        /// <param name="_maxPoint">房间最大点</param>
        public void JumpCorrespondingPosition(Transform _targetPosition, Transform _minPoint, Transform _maxPoint)
        {
            // 设置相机移动范围为房间范围
            SetCameraPosLimite(_minPoint.position, _maxPoint.position);

            // 确保目标点在指定房屋区域内
            Vector3 clampedTargetPoint = _targetPosition.position;
            clampedTargetPoint.x = Mathf.Clamp(clampedTargetPoint.x, _minPoint.position.x, _maxPoint.position.x);
            clampedTargetPoint.y = Mathf.Clamp(clampedTargetPoint.y, _minPoint.position.y, _maxPoint.position.y);
            clampedTargetPoint.z = Mathf.Clamp(clampedTargetPoint.z, _minPoint.position.z, _maxPoint.position.z);

            // 更新相机位置到目标点
            transform.position = clampedTargetPoint;
        }

        /// <summary>
        /// 跳转到对应内部区域
        /// </summary>
        /// <param name="_targetPosition">目标位置</param>
        /// <param name="_minPoint">房间最小点</param>
        /// <param name="_maxPoint">房间最大点</param>
        public void JumpCorrespondingPosition(Vector3 _targetPosition, Transform _minPoint, Transform _maxPoint)
        {
            // 设置相机移动范围为房间范围
            SetCameraPosLimite(_minPoint.position, _maxPoint.position);

            // 确保目标点在指定房屋区域内
            Vector3 clampedTargetPoint = _targetPosition;
            clampedTargetPoint.x = Mathf.Clamp(clampedTargetPoint.x, _minPoint.position.x, _maxPoint.position.x);
            clampedTargetPoint.y = Mathf.Clamp(clampedTargetPoint.y, _minPoint.position.y, _maxPoint.position.y);
            clampedTargetPoint.z = Mathf.Clamp(clampedTargetPoint.z, _minPoint.position.z, _maxPoint.position.z);

            // 更新相机位置到目标点
            transform.position = clampedTargetPoint;
        }

        /// <summary>
        /// 重置限定区域
        /// </summary>
        /// <param name="_targetPosition">跳转目标点</param>
        /// <param name="_isLargeScene">是否处于大场景限定范围，默认是true</param>
        /// <param name="_minPoint">如果_isLargeScene为默认值时，不需要填值</param>
        /// <param name="_maxPoint">如果_isLargeScene为默认值时，不需要填值</param>
        public void ResetLimit(Transform _targetPosition, bool _isLargeScene = true, Transform _minPoint = null, Transform _maxPoint = null)
        {
            if (_isLargeScene)
            {
                JumpCorrespondingPosition(_targetPosition, m_SceneMinPoint, m_SceneMaxPoint);
            }
            else
            {
                JumpCorrespondingPosition(_targetPosition, _minPoint, _maxPoint);
            }
        }

        /// <summary>
        /// 设置限定区域的状态
        /// </summary>
        /// <param name="_isActive"></param>
        public void SetStatusOfRestrictedArea(bool _isActive)
        {
            m_IsCouldCrossCollider = _isActive;
        }

        /// <summary>
        /// 检测相机是否在物体内
        /// </summary>
        /// <param name="_position"></param>
        /// <param name="_limit"></param>
        /// <returns></returns>
        private bool IsInsideHouse(Vector3 _position, LimitArea _limit)
        {
            Vector3 minPoint = _limit.minPoint.position;
            Vector3 maxPoint = _limit.maxPoint.position;

            return _position.x > minPoint.x && _position.x < maxPoint.x &&
                   _position.y > minPoint.y && _position.y < maxPoint.y &&
                   _position.z > minPoint.z && _position.z < maxPoint.z;
        }

        /// <summary>
        /// 判断相机的位置，并做出修改
        /// </summary>
        /// <param name="_position"></param>
        /// <param name="_limit"></param>
        /// <returns></returns>
        private Vector3 AdjustPositionOutsideHouse(Vector3 _position, LimitArea _limit)
        {
            Vector3 minPoint = _limit.minPoint.position;
            Vector3 maxPoint = _limit.maxPoint.position;

            // 计算相机当前位置与房屋边界的距离
            float xDistToMin = Mathf.Abs(_position.x - minPoint.x);
            float xDistToMax = Mathf.Abs(_position.x - maxPoint.x);
            float zDistToMin = Mathf.Abs(_position.z - minPoint.z);
            float zDistToMax = Mathf.Abs(_position.z - maxPoint.z);

            // 找到距离最近的边界
            float minDist = Mathf.Min(xDistToMin, xDistToMax, zDistToMin, zDistToMax);

            // 根据最近的边界调整相机位置
            if (minDist == xDistToMin)
            {
                // 相机靠近最小X边界
                _position.x = minPoint.x - 0.1f;
            }
            else if (minDist == xDistToMax)
            {
                // 相机靠近最大X边界
                _position.x = maxPoint.x + 0.1f;
            }
            else if (minDist == zDistToMin)
            {
                // 相机靠近最小Z边界
                _position.z = minPoint.z - 0.1f;
            }
            else if (minDist == zDistToMax)
            {
                // 相机靠近最大Z边界
                _position.z = maxPoint.z + 0.1f;
            }

            return _position;
        }

        /// <summary>
        /// 设置相机的移动范围
        /// </summary>
        /// <param name="_minPoint"></param>
        /// <param name="_maxPoint"></param>
        private void SetCameraPosLimite(Vector3 _minPoint, Vector3 _maxPoint)
        {
            xMin = _minPoint.x;
            xMax = _maxPoint.x;
            yMin = _minPoint.y;
            yMax = _maxPoint.y;
            zMin = _minPoint.z;
            zMax = _maxPoint.z;
        }

        /// <summary>
        /// 控制摄像机的旋转角度大小
        /// </summary>
        /// <param name="_angle"></param>
        /// <param name="_min"></param>
        /// <param name="_max"></param>
        /// <returns></returns>
        private float ClampAngle(float _angle, float _min, float _max)
        {
            if (_angle < -360)
            {
                _angle += 360;
            }

            if (_angle > 360)
            {
                _angle -= 360;
            }

            return Mathf.Clamp(_angle, _min, _max);
        }

        private void OnDrawGizmos()
        {
            if (m_IsDragAreaEffect)
            {
                Gizmos.color = Color.green;
                Gizmos.DrawWireCube(new Vector3((xMin + xMax) / 2, (yMin + yMax) / 2, (zMin + zMax) / 2),
                    new Vector3(xMax - xMin, yMax - yMin, zMax - zMin));

                Gizmos.color = Color.red;
                if (m_LimitAreas != null)
                {
                    foreach (LimitArea house in m_LimitAreas)
                    {
                        Vector3 minPoint = house.minPoint.position;
                        Vector3 maxPoint = house.maxPoint.position;
                        Vector3 center = (minPoint + maxPoint) / 2;
                        Vector3 size = maxPoint - minPoint;
                        Gizmos.DrawWireCube(center, size);
                    }
                }
            }
        }

        /// <summary>
        /// 设置相机的初始数据
        /// </summary>
        private void SetCameraInitData()
        {
            CameraConfig cameraConfig = GetCameraConfigData();

            if (cameraConfig == null)
            {
                return;
            }

            m_MoveSpeed = cameraConfig.MoveSpeed;
            m_XSpeed = cameraConfig.XRotateSpeed;
            m_YSpeed = cameraConfig.YRotateSpeed;
            m_MouseSpeed = cameraConfig.MiddleMouseZoomSpeed;
            m_YMinLimit = cameraConfig.YMinLimit;
            m_YMaxLimit = cameraConfig.YMaxLimit;
            m_SpeedLimit = cameraConfig.MiddleMouseMoveSpeed;
        }
        
        /// <summary>
        /// 获取相机配置数据
        /// </summary>
        /// <returns></returns>
        private CameraConfig GetCameraConfigData()
        {
            // 拼接文件基本路径
            string filePath = PathHelper.CombineFilePath(PathHelper.m_ReadOnlyPath,
                "Json",
                "CameraConfig.json");

            string fileData = FileHelper.GetAllDataInfo(filePath);
        
            CameraConfig config = JsonUtility.FromJson<CameraConfig>(fileData);

            return config == null ? null : config;
        }
    }
}