using UnityEngine;
using System.Collections;

public class Camera360 : MonoBehaviour
{
    public Transform target;
    public Vector3 targetOffset;
    public float initdistance = 5.0f;
    public float maxDistance = 20;
    public float minDistance = .6f;
    public float xSpeed = 200.0f;
    public float ySpeed = 200.0f;
    public int yMinLimit = -80;
    public int yMaxLimit = 80;
    public int zoomRate = 40;
    public float panSpeed = 0.3f;
    public float zoomDampening = 5.0f;
    public float autoRotate = 1f;
    public float autoRotateSpeed = 0.1f;

    private float xDeg = 0.0f;
    private float yDeg = 0.0f;
    public float currentDistance;
    private float desiredDistance;
    private Quaternion currentRotation;
    private Quaternion desiredRotation;
    private Quaternion rotation;
    private Vector3 position;
    private float idleTimer = 0.0f;
    private float idleSmooth = 0.0f;

    void Start()
    {
        Init();
        //if (!target)
        //{

        //    go = new GameObject("cam target");
        //    go.transform.position = transform.position + (transform.forward * distance);
        //    target = go.transform;
        //}
    }
    GameObject go;
    void OnEnable()
    {
        //Init();
        
    }

    public void SetTarget(Transform objCenter)
    {
        go.transform.position = objCenter.position;
        go.transform.rotation = objCenter.rotation;
        currentDistance = desiredDistance = initdistance;
        //更新距离
        //视角定位到X轴
        currentRotation = rotation= Quaternion.LookRotation(-objCenter.right);
        transform.rotation = currentRotation;
        xDeg = transform.rotation.eulerAngles.y;
        yDeg = transform.rotation.eulerAngles.x;
    }

    public void Init()
    {
        //
        if (!target)
        {

            go = new GameObject("cam target");
            go.transform.position = transform.position + (transform.forward * initdistance);
            target = go.transform;
        }


        //distance = Vector3.Distance(transform.position, target.position);
        currentDistance = initdistance;
        desiredDistance = initdistance;

        //be sure to grab the current rotations as starting points.
        position = transform.position;
        rotation = transform.rotation;
        currentRotation = transform.rotation;
        desiredRotation = transform.rotation;

        //xDeg = Vector3.Angle(Vector3.right, transform.right);
        //yDeg = Vector3.Angle(Vector3.up, transform.up);
        xDeg = transform.rotation.eulerAngles.y;
        yDeg = transform.rotation.eulerAngles.x;
        position = target.position - (rotation * Vector3.forward * currentDistance + targetOffset);
    }

    /*
     * Camera logic on LateUpdate to only update after all character movement logic has been handled.
     */
    void LateUpdate()
    {
        if (target == null)
            return;
        // If Control and Alt and Middle button? ZOOM!
        //if (Input.GetMouseButton(2) && Input.GetKey(KeyCode.LeftAlt) && Input.GetKey(KeyCode.LeftControl))
        //{
        //    desiredDistance -= Input.GetAxis("Mouse Y") * 0.02f * zoomRate * 0.125f * Mathf.Abs(desiredDistance);
        //}
        //// If middle mouse and left alt are selected? ORBIT
        //else
        if (Input.GetMouseButton(0))
        {
            xDeg += Input.GetAxis("Mouse X") * xSpeed * 0.02f;
            yDeg -= Input.GetAxis("Mouse Y") * ySpeed * 0.02f;
            //Clamp the vertical axis for the orbit
            yDeg = ClampAngle(yDeg, yMinLimit, yMaxLimit);
            // set camera rotation
            desiredRotation = Quaternion.Euler(yDeg, xDeg, 0);
            currentRotation = transform.rotation;
            rotation = Quaternion.Lerp(currentRotation, desiredRotation, 0.02f * zoomDampening);
            transform.rotation = rotation;

            // Reset idle timers

            idleTimer = 0;
            idleSmooth = 0;

        }
        else
        {
            //自动旋转
            //idleTimer+= 0.02f;
            // if (idleTimer > autoRotate && autoRotate > 0)
            // {
            //     idleSmooth += (0.02f + idleSmooth) * 0.005f;
            //     idleSmooth = Mathf.Clamp(idleSmooth, 0, 1);
            //     xDeg += xSpeed * Time.deltaTime * idleSmooth * autoRotateSpeed;
            // }


            // //Clamp the vertical axis for the orbit
            // yDeg = ClampAngle(yDeg, yMinLimit, yMaxLimit);
            // // set camera rotation
            // desiredRotation = Quaternion.Euler(yDeg, xDeg, 0);
            // currentRotation = transform.rotation;
            // rotation = Quaternion.Lerp(currentRotation, desiredRotation, 0.02f * zoomDampening * 2);
            // transform.rotation = rotation;



        }


        // Middle click disabled
        //         otherwise if middle mouse is selected, we pan by way of transforming the target in screenspace
        //        else if (Input.GetMouseButton(2))
        //        {
        //            grab the rotation of the camera so we can move in a psuedo local XY space
        //            target.rotation = transform.rotation;
        //            target.Translate(Vector3.right * -Input.GetAxis("Mouse X") * panSpeed);
        //            target.Translate(transform.up * -Input.GetAxis("Mouse Y") * panSpeed, Space.World);
        //        }

        //Orbit Position
        // affect the desired Zoom distance if we roll the scrollwheel
        desiredDistance -= Input.GetAxis("Mouse ScrollWheel") * 0.02f * zoomRate * Mathf.Abs(desiredDistance);
        //clamp the zoom min/max
        desiredDistance = Mathf.Clamp(desiredDistance, minDistance, maxDistance);
        // For smoothing of the zoom, lerp distance
        currentDistance = Mathf.Lerp(currentDistance, desiredDistance, 0.02f * zoomDampening);
        // calculate position based on the new currentDistance
        position = target.position - (rotation * Vector3.forward * currentDistance + targetOffset);
        transform.position = position;
    }

    private static float ClampAngle(float angle, float min, float max)
    {
        if (angle < -360)
            angle += 360;
        if (angle > 360)
            angle -= 360;
        return Mathf.Clamp(angle, min, max);
    }
    /// <summary>
    /// 修改物体及子物体层级
    /// </summary>
    /// <param name="obj"></param>
    /// <param name="layerName"></param>
    public void ChangeObjLayer(GameObject obj,string layerName)
    {
        foreach (Transform item in obj.GetComponentsInChildren<Transform>(true))
        {
            item.gameObject.layer = LayerMask.NameToLayer(layerName);
        }
    }

}