using UnityEngine;

public class ControlMoveWithCollider : MonoBehaviour
{
    public float moveSpeed = 50f;    // 右键平移速度
    public float zoomSpeed = 10f;    // 滚轮缩放速度
    public ClickToFocus inScript;    // 引用焦点脚本，提供 core
    public float rotationSensitivity = 0.2f;   // 左键拖拽旋转灵敏度
    //public float minPitch = -8f;     // 最低俯仰角
    //public float maxPitch = 80f;    // 最高俯仰角

    private Camera cam;
    private bool isRotating = false;
    private Vector2 lastMousePos;
    private Vector3 reservoirCenter = new Vector3(1551f, 25f, 1119f);
    private Rigidbody rb;

    void Start()
    {
        rb = GetComponent<Rigidbody>();
        cam = Camera.main;
        Vector3 core = inScript.core;
        if (inScript == null)
            Debug.LogError("请在 Inspector 中把挂有 ClickToFocus 的物体拖给 inScript");
    }

    void Update()
    {
        //if (SliderDragDetector.isSliderDragging)
        //    return;
        if (inScript == null) return;
        Vector3 core = inScript.core;

        // —— 右键平移 ——  
        if (Input.GetMouseButton(1))
        {
            moveSpeed = Vector3.Distance(core, transform.position) / 2f;//这里涉及到像素和实际空间米的关系转换
            float mx = Input.GetAxis("Mouse X");
            float my = Input.GetAxis("Mouse Y");
            Vector3 desiredPosition = cam.transform.position + (-cam.transform.right * mx + -cam.transform.up * my) * moveSpeed * Time.deltaTime;

            // 判断是否与障碍物发生碰撞
            if (!WillCollideWithObstacle(desiredPosition))
            {
                cam.transform.position = desiredPosition;
            }
        }

        // —— 滚轮缩放 ——  
        float scroll = Input.GetAxis("Mouse ScrollWheel");
        if (Mathf.Abs(scroll) > 0.001f)
        {
            Vector3 desiredPosition = cam.transform.position + cam.transform.forward * scroll * zoomSpeed;

            // 判断是否与障碍物发生碰撞
            if (!WillCollideWithObstacle(desiredPosition))
            {
                cam.transform.position = desiredPosition;
            }
        }

        // —— 左键开始/结束旋转 ——  
        if (Input.GetMouseButtonDown(0))
        {
            isRotating = true;
            lastMousePos = Input.mousePosition;
        }
        if (Input.GetMouseButtonUp(0))
        {
            isRotating = false;
        }

        // —— 左键拖拽：RotateAround 实现 + 俯仰限制 ——  
        if (isRotating && Input.GetMouseButton(0))
        {
            Vector2 curr = Input.mousePosition;
            Vector2 delta = (curr - lastMousePos) * rotationSensitivity;
            lastMousePos = curr;

            /*
            
            */
            // 1. 水平绕世界 Y 轴旋转
            //Vector3 desiredPosition = cam.transform.position;
            //cam.transform.RotateAround(core, Vector3.up, delta.x);

            Vector3 localPosHorizonal = cam.transform.position - core;
            Quaternion rotationHorizonal = Quaternion.AngleAxis(delta.x, Vector3.up);
            Vector3 newLocalPosHorizonal = rotationHorizonal * localPosHorizonal;
            Vector3 newPosHorizonal = core + newLocalPosHorizonal;


            // 检查旋转后是否发生碰撞
            if (!WillCollideWithObstacle(newPosHorizonal))
            {
                // 如果没有碰撞，执行旋转
                cam.transform.RotateAround(core, Vector3.up, delta.x);
            }
            else
            {
                // 如果碰撞了，就不动

            }

            // 2. 俯仰旋转
            Vector3 dir = (cam.transform.position - core).normalized;
            Vector3 flat = new Vector3(dir.x, 0f, dir.z).normalized;
            float selfFlatX = cam.transform.forward.x;
            float selfFlatZ = cam.transform.forward.z;
            Vector3 selfFlat = new Vector3(selfFlatX, 0f, selfFlatZ).normalized;
            float selfPitch = Vector3.SignedAngle(selfFlat, cam.transform.forward, cam.transform.right);



            if (selfPitch <= 80f && selfPitch >= 0f)
            {

                float pitchDelta = delta.y * -1f;

                Vector3 localPosVertical = cam.transform.position - core;
                Quaternion rotationVertical = Quaternion.AngleAxis(pitchDelta, cam.transform.right);
                Vector3 newPosVertical = core + rotationVertical * localPosVertical;


                if (!WillCollideWithObstacle(newPosVertical))
                {
                    cam.transform.RotateAround(core, cam.transform.right, pitchDelta);
                }

            }
            else if (selfPitch > 80f)
            {
                float pitchDelta = delta.y * -1f;
                if (pitchDelta < 0f)
                {
                    cam.transform.RotateAround(core, cam.transform.right, pitchDelta);
                }
            }
            else if (selfPitch < 0f)
            {
                float pitchDelta = delta.y * -1f;
                if (pitchDelta > 0f)
                {
                    cam.transform.RotateAround(core, cam.transform.right, pitchDelta);
                }
            }
        }
    }

    // 碰撞检测方法
    bool WillCollideWithObstacle(Vector3 targetPosition)
    {
        // 计算从当前位置到目标位置的方向和距离
        Vector3 moveDir = targetPosition - cam.transform.position;
        float moveDist = moveDir.magnitude;

        // 使用 SphereCast 检查即将到达的位置是否会与障碍物发生碰撞
        RaycastHit hit;
        if (Physics.SphereCast(cam.transform.position, 0.5f, moveDir, out hit, moveDist, LayerMask.GetMask("Default"), QueryTriggerInteraction.Collide) )
        {
            // 如果检测到碰撞，返回 true
            Debug.Log("collider");
            return true;
        }
        else if (   Mathf.Pow(targetPosition.x+120f, 2f)+ Mathf.Pow(targetPosition.z , 2f)<10000f && targetPosition.y<80f)
        {
            // 如果在范围内，返回 false
            return false;
        }
        else
            Debug.Log("outRange");
        return true;//这个true是为了有返回值，实际上走不到这一步

    }
}