using UnityEngine;
using UnityEditor;
using System;

public static class NodeEditorResources {

    public static Texture2D gridTexture { get { return _gridTexture != null ? _gridTexture : _gridTexture = GenerateGridTexture(); } }
    private static Texture2D _gridTexture;
    public static Texture2D crossTexture { get { return _crossTexture != null ? _crossTexture : _crossTexture = GenerateCrossTexture(); } }
    private static Texture2D _crossTexture;
    public static Texture2D dot { get { return _dot != null ? _dot : _dot = Resources.Load<Texture2D>("dot"); } }
    private static Texture2D _dot;
    public static Texture2D dotOuter { get { return _dotOuter != null ? _dotOuter : _dotOuter = Resources.Load<Texture2D>("dot_outer"); } }
    private static Texture2D _dotOuter;

    private static Color backgroundColor = new Color(0.18f, 0.18f, 0.18f);
    private static Color veinColor = new Color(0.25f, 0.25f, 0.25f);
    private static Color arteryColor = new Color(0.34f, 0.34f, 0.34f);
    private static Color crossColor = new Color(0.45f, 0.45f, 0.45f);

    public static Styles styles { get { return _styles != null ? _styles : _styles = new Styles(); } }
    public static Styles _styles = null;

    public class Styles {
        public GUIStyle inputStyle, outputStyle;

        public Styles() {
            GUIStyle baseStyle = new GUIStyle("Label");
            baseStyle.fixedHeight = 18;

            inputStyle = new GUIStyle(baseStyle);
            inputStyle.alignment = TextAnchor.UpperLeft;
            inputStyle.padding.left = 10;

            outputStyle = new GUIStyle(baseStyle);
            outputStyle.alignment = TextAnchor.UpperRight;
            outputStyle.padding.right = 10;
        }
    }

    public static Texture2D GenerateGridTexture() {
        Texture2D tex = new Texture2D(64,64);
        Color[] cols = new Color[64 * 64];
        for (int y = 0; y < 64; y++) {
            for (int x = 0; x < 64; x++) {
                Color col = backgroundColor;
                if (y % 16 == 0 || x % 16 == 0) col = veinColor;
                if (y == 63 || x == 63) col = arteryColor;
                cols[(y * 64) + x] = col;
            }
        }
        tex.SetPixels(cols);
        tex.wrapMode = TextureWrapMode.Repeat;
        tex.filterMode = FilterMode.Bilinear;
        tex.name = "Grid";
        tex.Apply();
        return tex;
    }

    public static Texture2D GenerateCrossTexture() {
        Texture2D tex = new Texture2D(64, 64);
        Color[] cols = new Color[64 * 64];
        for (int y = 0; y < 64; y++) {
            for (int x = 0; x < 64; x++) {
                Color col = crossColor;
                if (y != 31 && x != 31) col.a = 0;
                cols[(y * 64) + x] = col;
            }
        }
        tex.SetPixels(cols);
        tex.wrapMode = TextureWrapMode.Clamp;
        tex.filterMode = FilterMode.Bilinear;
        tex.name = "Grid";
        tex.Apply();
        return tex;
    }
}