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

[ExecuteInEditMode]
[RequireComponent(typeof(MeshFilter),typeof(MeshRenderer))]
public class MyImage : MonoBehaviour
{
    Mesh mesh;
    VertexHelper vertexHelper = new VertexHelper();
    public Color color;

    private MeshFilter meshFilter;
    private MeshRenderer meshRenderer;
    private MeshCollider collider;

    public Texture2D texture;
    public Camera camera;

    // Start is called before the first frame update
    void Start()
    {
        meshFilter = GetComponent<MeshFilter>();
        meshRenderer = GetComponent<MeshRenderer>();
        collider = GetComponent<MeshCollider>();
        camera = Camera.main;
        InitMesh();
    }

    // Update is called once per frame
    void Update()
    {
        var ray = camera.ScreenPointToRay(Input.mousePosition);
        RaycastHit hitInfo;
        Physics.Raycast(ray, out hitInfo);
        if (hitInfo.collider != null && hitInfo.collider.gameObject!=null)
        {
            if (Input.GetMouseButtonDown(0))
            {
                Debug.Log("Image Clicked!");
            }
        }

        Debug.DrawLine(ray.origin, ray.origin + ray.direction*100, Color.red);


        meshRenderer.material.color = color;
        meshRenderer.material.mainTexture = texture;
    }

    private void InitMesh()
    {
        mesh = new Mesh();
        vertexHelper.Clear();
        vertexHelper.AddVert(new Vector2(0,0),color,new Vector2(0,0));
        vertexHelper.AddVert(new Vector2(0,1),color,new Vector2(0,1));
        vertexHelper.AddVert(new Vector2(1,1),color,new Vector2(1,1));
        vertexHelper.AddVert(new Vector2(1,0),color,new Vector2(1,0));

        vertexHelper.AddTriangle(0, 1, 2);
        vertexHelper.AddTriangle(2, 3, 0);
        vertexHelper.FillMesh(mesh);

        meshFilter.mesh = mesh;
        collider.sharedMesh = mesh;
    }

}