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

public class TextImage : TextEx
{
    [SerializeField] Sprite m_Sprite;

    public Sprite sprite {
        get { return m_Sprite; }
        set {
            m_Sprite = value;
            SetVerticesDirty();
        }
    }

    protected override void Awake()
    {
        base.Awake();
        // todo yyl
        // base.font = FontUtility.preferred;
        // base.material = MaterialUtility.hudMaterial;

        if (sprite != null)
        {
            base.material.SetTexture("_Tex2", sprite.texture);
        }
    }

    protected override void OnPopulateMesh(VertexHelper vh)
    {
        if (sprite != null)
        {
            vh.Clear();
        }

        base.OnPopulateMesh(vh);

        if (sprite != null)
        {
            var size = new Vector2(rectTransform.rect.width, rectTransform.rect.height);
            var positions = new Vector3[4];
            var uvs = new Vector2[4];

            var uv = sprite != null ? DataUtility.GetOuterUV(sprite) : Vector4.zero;
            var width = rectTransform.rect.width;
            var height = rectTransform.rect.height;

            var uvCenterX = (uv.x + uv.z) * 0.5f;
            var uvCenterY = (uv.y + uv.w) * 0.5f;
            var uvScaleX = (uv.z - uv.x) / width;
            var uvScaleY = (uv.w - uv.y) / height;

            var position = positions[0] = new Vector2(-size.x * 0.5f, -size.y * 0.5f);
            uvs[0] = new Vector2(position.x * uvScaleX + uvCenterX, position.y * uvScaleY + uvCenterY);

            position = positions[1] = new Vector2(size.x * 0.5f, -size.y * 0.5f);
            uvs[1] = new Vector2(position.x * uvScaleX + uvCenterX, position.y * uvScaleY + uvCenterY);

            position = positions[2] = new Vector2(size.x * 0.5f, size.y * 0.5f);
            uvs[2] = new Vector2(position.x * uvScaleX + uvCenterX, position.y * uvScaleY + uvCenterY);

            position = positions[3] = new Vector2(-size.x * 0.5f, size.y * 0.5f);
            uvs[3] = new Vector2(position.x * uvScaleX + uvCenterX, position.y * uvScaleY + uvCenterY);

            for (var i = 0; i < 4; i++)
            {
                vh.AddVert(positions[i], color, uvs[i], uvs[i], new Vector3(1, 0, -1), new Vector4(1, 0, 0, -1));
            }

            vh.AddTriangle(0, 1, 2);
            vh.AddTriangle(2, 3, 0);
        }

    }



}