using UnityEngine;
using UnityEngine.UI;

public class LineImage : RawImage
{
    public enum LineDirection
    {
        Vertical,
        Horizontal        
    }

    public LineDirection lineDirection = LineDirection.Vertical;

    protected override void Awake()
    {
        base.Awake();

        Texture2D tex = new Texture2D(3, 3, TextureFormat.RGBA32, false);

        Color c0 = new Color(0.0f, 0.0f, 0.0f, 0.0f);
        Color c1 = new Color(1.0f, 1.0f, 1.0f, 1.0f);

        tex.SetPixel(0, 0, c1);
        tex.SetPixel(1, 0, c1);
        tex.SetPixel(2, 0, c1);

        tex.SetPixel(0, 1, c1);
        tex.SetPixel(1, 1, c1);
        tex.SetPixel(2, 1, c1);

        tex.SetPixel(0, 2, c1);
        tex.SetPixel(1, 2, c1);
        tex.SetPixel(2, 2, c1);

        tex.wrapMode = TextureWrapMode.Repeat;

        tex.filterMode = FilterMode.Point;
        tex.Apply();

        this.texture = tex;
    }

    protected override void Start()
    {
        base.Start();
        RecomputeSize();
    }

    protected override void OnRectTransformDimensionsChange()
    {
        RecomputeSize();
        base.OnRectTransformDimensionsChange();
    }

    void RecomputeSize()
    {
#if UNITY_EDITOR
        if (!UnityEditor.EditorApplication.isPlaying)
            return;
#endif
        float scaleFactor = 1.0f / transform.lossyScale.x;
        //Debug.Log($"<color=magenta>SCREEN SIZE CHANGED - scaleFactor={scaleFactor} </color>");

        Vector2 sd = rectTransform.sizeDelta;
        if (lineDirection == LineDirection.Horizontal)
        {
            sd.y = scaleFactor;
        }
        else
        {
            sd.x = scaleFactor;
        }
        rectTransform.sizeDelta = sd;
    }
}