using UnityEngine;
using UnityEngine.UI;
using AX.MessageSystem;

public class CharacterMessagePanel : MonoBehaviour {

    private GameObject mFollowObj;
    private GameObject mCanvas;
    private Vector3 offset;
    private static CharacterMessagePanel instance;

    private Text mUserName;//姓名
    private Text mDutyCategory;//职务

    private void Awake()
    {
        mUserName = transform.Find("UserName").GetComponent<Text>();
        mDutyCategory = transform.Find("DutyCategory").GetComponent<Text>();
        mCanvas = GameObject.Find("Canvas");
        offset = new Vector3(0,6,0);
    }
    void Start () {
        MessageDispatcher.AddListener("HideOtherMessagePanel",HidePanel);
	}
    private void OnDestroy()
    {
        MessageDispatcher.RemoveListener("HideOtherMessagePanel", HidePanel);
    }
    private void HidePanel(IMessage obj)
    {
        var messageType = (MessageType)obj.Data;
        if (messageType != MessageType.CharacterMessage)
        {
            instance.gameObject.SetActive(false);
        }
    }
	
	void Update () {
        SetUIPosition();
	}

    public static CharacterMessagePanel Instance
    {
        get
        {
            if (instance == null)
            {
                var panel = Resources.Load("UI/CharacterMessagePanel") as GameObject;
                var parent = GameObject.Find("Canvas/MessageParent").transform;
                var cloneObj = Instantiate(panel,parent);
                cloneObj.name = panel.name;
                instance = cloneObj.GetComponent<CharacterMessagePanel>();
                cloneObj.SetActive(false);
            }
            return instance;
        }
    }

    public void SetUI(GameObject obj)
    {
        mFollowObj = obj;
        if (obj.GetComponent<CloneGameObjInfo>().gameObjType == CloneObjType.fireman)
        {
            var mFireManMessage = obj.GetComponent<CloneGameObjInfo>();
            instance.gameObject.SetActive(true);
            mUserName.text = "";
            mDutyCategory.text = mFireManMessage.GetObjectName();
        }
        else if(obj.GetComponent<CloneGameObjInfo>().gameObjType == CloneObjType.Character)
        {
            CloneGameObjInfo mCloneGameObjInfo = obj.GetComponent<CloneGameObjInfo>();
            instance.gameObject.SetActive(true);
            User mUser = new User();
            mUser.Id = mCloneGameObjInfo.UserID;
            Room mRoom = CurrentUserInfo.room;
            foreach (UserData mUserData in mRoom.UserList)
            {
                if (mUser.Id == mUserData.UserInfo.Id)
                {
                    mUserName.text = mUserData.UserInfo.RealName;
                    mDutyCategory.text = mUserData.Role.ToString();
                }
            }
        }         
    }

    private void SetUIPosition()
    {
        Vector3 dir = (mFollowObj.transform.position - Camera.main.gameObject.transform.position).normalized;
        float dot = Vector3.Dot(Camera.main.gameObject.transform.forward,dir);//判断物体是否在相机前面
        if (dot < 0)
        {
            gameObject.SetActive(false);
            return;
        }
        else
        {
            gameObject.SetActive(true);
        }
        Vector2 position;
        //世界坐标转屏幕坐标
        Vector2 screenPosition = Camera.main.WorldToScreenPoint(mFollowObj.transform.position + offset);
        //屏幕坐标转画布坐标
        RectTransformUtility.ScreenPointToLocalPointInRectangle(transform.parent.GetComponent<RectTransform>(),screenPosition, mCanvas.GetComponent<Canvas>().worldCamera, out position);
        GetComponent<RectTransform>().anchoredPosition = position;
    }
}