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

public class UINameItem : MonoBehaviour
{
    private Canvas MainCanvas;

    private RectTransform MyRect;

    public GameObject Target;

    public Vector3 offest = Vector3.zero;

    [HideInInspector]
    public long ID;

    private bool Show;
    public void OnDestroy()
    {
        MessageDispatcher.RemoveListener("CHANGE_HEAD_NAME", ChangeHeadName);//改变头顶名称
        MessageDispatcher.RemoveListener("CONTROL_HIDE_SHOW_HEAD_NAME", ControlHideShowHeadName);//控制隐藏物体时候显隐名称
        MessageDispatcher.RemoveListener("ONDESROY_HEAD_NAME", OnDestroyName);//控制有名称的物体被销毁时候销毁名称
    }

    public void Awake()
    {
        MessageDispatcher.AddListener("CHANGE_HEAD_NAME", ChangeHeadName);//改变头顶名称
        MessageDispatcher.AddListener("CONTROL_HIDE_SHOW_HEAD_NAME", ControlHideShowHeadName);//控制隐藏物体时候显隐名称
        MessageDispatcher.AddListener("ONDESROY_HEAD_NAME", OnDestroyName);//控制有名称的物体被销毁时候销毁名称
    }

    private void OnDestroyName(IMessage obj)
    {
        DestroyUINameCmdArgs arg = (DestroyUINameCmdArgs)obj.Data;
        if (ID == arg.gameObjID)
            Destroy(gameObject);
    }
    private void ControlHideShowHeadName(IMessage obj)
    {
        HideShowUINameCmdArgs arg = (HideShowUINameCmdArgs)obj.Data;
        //if (ID == arg.gameObjID)
        //    Show = arg.IsHide;

        if (Target.activeSelf)
            Show = !arg.IsHide;

        if (!gameObject.activeSelf && Show)
            gameObject.SetActive(true);
    }
    private void SingleHideShowHeadName(IMessage obj)
    {
        HideShowUINameCmdArgs arg = (HideShowUINameCmdArgs)obj.Data;
        if (ID != arg.gameObjID)
            return;
        if (Target.activeSelf)
            Show = !arg.IsHide;

        if (!gameObject.activeSelf && Show)
            gameObject.SetActive(true);
    }
    private void ChangeHeadName(IMessage obj)
    {
        ChangeUINameCmdArgs arg = (ChangeUINameCmdArgs)obj.Data;
        if (ID == arg.gameObjID)
            GetComponent<Text>().text = arg.Value;
    }
    void Start()
    {
        MainCanvas = GameObject.Find("Canvas").GetComponent<Canvas>();
        MyRect = GetComponent<RectTransform>();
        ID = Target.GetComponent<BaseGameObjInfo>().gameObjID;
    }

    // Update is called once per frame
    void Update()
    {
        if (Target == null)
        {
            Destroy(gameObject);
        }
        else
        {
            if (Show)
            {
                if (!IsInView(Target.transform.position))
                {
                    MyRect.transform.position = new Vector2(10000, 10000);
                    return;
                }
                Vector3 point = Target.transform.position + offest;
                Vector3 Targetscreenpos = Camera.main.WorldToScreenPoint(point);
                Vector3 viewpos = GameObject.Find("UICamera").GetComponent<Camera>().ScreenToWorldPoint(Targetscreenpos);
                viewpos.z = 0;

                MyRect.transform.position = viewpos;
            }
            else
            {
                if (gameObject.activeSelf)
                    gameObject.SetActive(false);
            }
        }
    }

    public bool IsInView(Vector3 worldPos)
    {
        Transform camTransform = Camera.main.transform;
        Vector2 viewPos = Camera.main.WorldToViewportPoint(worldPos);
        Vector3 dir = (worldPos - camTransform.position).normalized;
        float dot = Vector3.Dot(camTransform.forward, dir);//判断物体是否在相机前面

        if (dot > 0 && viewPos.x >= 0 && viewPos.x <= 1 && viewPos.y >= 0 && viewPos.y <= 1)
            return true;
        else
            return false;
    }
}