using UnityEngine;

namespace XNodeEditor {
    public static class NodeEditorResources {
        //Unec textures
        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>("unec_dot"); } }
        private static Texture2D _dot;
        public static Texture2D dotOuter { get { return _dotOuter != null ? _dotOuter : _dotOuter = Resources.Load<Texture2D>("unec_dot_outer"); } }
        private static Texture2D _dotOuter;
        public static Texture2D nodeBody { get { return _nodeBody != null ? _nodeBody : _nodeBody = Resources.Load<Texture2D>("unec_node"); } }
        private static Texture2D _nodeBody;

        //Grid colors
        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);

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

        public class Styles {
            public GUIStyle inputPort, outputPort, nodeHeader, nodeBody, tooltip;

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

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

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

                nodeHeader = new GUIStyle();
                nodeHeader.alignment = TextAnchor.MiddleCenter;
                nodeHeader.fontStyle = FontStyle.Bold;
                nodeHeader.normal.textColor = Color.white;

                nodeBody = new GUIStyle();
                nodeBody.normal.background = NodeEditorResources.nodeBody;
                nodeBody.border = new RectOffset(32, 32, 32, 32);
                nodeBody.padding = new RectOffset(16, 16, 4, 16);

                tooltip = new GUIStyle("helpBox");
                tooltip.alignment = TextAnchor.MiddleCenter;
            }
        }

        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;
        }
    }
}