using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PointDrawer : MonoBehaviour
{

    private CanvasGroup CanvasGroup;
    public GameObject PointPrefab;
    private Dictionary<int, RectTransform> PointGroup = new Dictionary<int, RectTransform>();

    //[SerializeField]
    // Camera camera;

    //Vector2 propertion;

    [AutoUI]
    public bool Visible;
    [AutoUI]
    private int PointSize = 256;

    // Start is called before the first frame update
    void Start()
    {
        CanvasGroup = GetComponent<CanvasGroup>();
        //propertion = new Vector2
            //((float)camera.targetTexture.width / (float)Screen.width , (float)camera.targetTexture.height / (float)Screen.height); 
    }

    // Update is called once per frame
    void Update()
    {
        CanvasGroup.alpha = Visible ? 1 : 0;

        if (Visible == false)
        {
            if(PointGroup.Count > 0)
            {
                foreach (var touch in TUIOManager.Instance.touches)
                    RemovePoint(touch.Key);
            }
            return;
        }
            

        foreach(var touch in TUIOManager.Instance.touches)
        {
            switch(touch.Value.phase)
            {
                case TouchPhase.Began:
                    AddPoint(touch.Key, touch.Value.position);
                    break;
                case TouchPhase.Moved:
                    UpdatePoint(touch.Key, touch.Value.position);
                    break;
                case TouchPhase.Ended:
                    RemovePoint(touch.Key);
                    break;
                default:
                    break;
            }
        }

    }

    public void AddPoint(int id , Vector2 pos)
    {
        RectTransform objRect = null;
        if (PointGroup.TryGetValue(id, out objRect))
        {
            UpdatePoint(id , pos);
        }
        var obj = Instantiate(PointPrefab, this.transform);
        obj.name = id.ToString();
        objRect = obj.GetComponent<RectTransform>();
        objRect.sizeDelta = Vector2.one * PointSize;
        UpdatePos(objRect, pos);
        PointGroup.Add(id , objRect);
    }

    public void UpdatePoint(int id, Vector2 pos)
    {
        if (PointGroup.TryGetValue(id, out var objRect))
        {
            UpdatePos(objRect , pos);
        }
        else
        {
            AddPoint(id, pos);
        }
    }

    private void UpdatePos(RectTransform tran, Vector2 pos)
    {
        tran.anchoredPosition = pos;// * propertion;
    }

    public void RemovePoint(int id)
    {
        if(PointGroup.TryGetValue(id ,out var obj))
        {
            PointGroup.Remove(id);
            Destroy(obj.gameObject);
        }
    }

}