using AX.MessageSystem;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class QuadCamera : MonoBehaviour
{
    public CloneGameObjInfo info;
    public Transform target;
    private Camera myCam;
    private float height = 1.5f; //查看人员模式下，摄像机高度
    private float distance = 2; //查看人员模式下，人与摄像机之间的距离
    private float dampTrace = 20.0f; //查看人员模式下，摄像机平滑追踪的变量
    private float lookingAtHeight = 2f;
    private float lookingAtDistance = 5;
    void Awake()
    {
        myCam = GetComponent<Camera>();
    }
    public void SetTarget(CloneGameObjInfo info)
    {
        this.info = info;
        MessageDispatcher.AddListener("CancelQuadDisplay", DeleteThisCamera);
        MessageDispatcher.AddListener("OpenFourthG", DisableCameraOpenTransfer);
        MessageDispatcher.AddListener("QuadrupleMode", DisableCamera);
        target = EntitiesManager.Instance.GetEntityByID(info.gameObjID).transform;
    }
    void OnDestroy()
    {
        MessageDispatcher.RemoveListener("CancelQuadDisplay", DeleteThisCamera);
        MessageDispatcher.RemoveListener("OpenFourthG", DisableCameraOpenTransfer);
        MessageDispatcher.RemoveListener("QuadrupleMode", DisableCamera);
    }
    /// <summary>
    /// 关闭四分屏模式，或四分屏模式下关闭4G图传窗口，则禁用四分屏相机，减少性能消耗
    /// </summary>
    /// <param name="obj"></param>
    private void DisableCamera(IMessage obj)
    {
        var value = (bool)obj.Data;
        this.enabled = value;
        myCam.enabled = value;
    }
    private void DisableCameraOpenTransfer(IMessage obj)
    {
        var value = (bool)obj.Data;
        //打开图传面板时，如果不在四分屏模式，则相机和此脚本禁用
        //关闭图传面板时，相机和此脚本禁用
        if ((/*打开图传面板*/value == true && /*不在四分屏模式*/QuadrupleMode.quadingMode == false) || /*关闭图传面板*/value == false)
        {
            this.enabled = false;
            myCam.enabled = false;
            return;
        }
        //打开图传面板时，在四分屏模式，则相机和此脚本开启
        if (value == true && QuadrupleMode.quadingMode == true)
        {
            this.enabled = true;
            myCam.enabled = true;
            return;
        }
    }
    /// <summary>
    /// 删除此四分相机
    /// </summary>
    /// <param name="obj"></param>
    private void DeleteThisCamera(IMessage obj)
    {
        var deleteInfo = (CloneGameObjInfo)obj.Data;
        if (deleteInfo.gameObjID == info.gameObjID)
        {
            Destroy(gameObject);
        }
        else
        {
            StartCoroutine(UpdateName());
        }
    }
    IEnumerator UpdateName()
    {
        yield return new WaitForEndOfFrame();
        gameObject.name = "QuadCam-" + transform.GetSiblingIndex().ToString();
    }
    void LateUpdate()
    {
        //有目标人员并且相机当前激活
        if (target && myCam.enabled == true)
        {
            //相机的位置，在人员胸前
            transform.position = Vector3.Lerp(transform.position, target.position + (target.forward * distance) + (Vector3.up * height), Time.deltaTime * dampTrace);
            //transform.LookAt(target.position); 
            transform.LookAt(target.position + (target.forward * lookingAtDistance) + (Vector3.up * lookingAtHeight));
        }
    }
}