using System;
using System.Drawing;
using OpenTK;
using OpenTK.Graphics;
using System.Collections.Generic;

namespace Example
{
    public class TKFontTest : GameWindow
    {
        List<TextureFont> textureFontList = new List<TextureFont>();
        TextHandle textHandle;
        ITextPrinter textPrinter = new TextPrinter();

        string[] text = new string[]
            {
                "ABCD abcd To whom it may concern",
                "Triangles",
            };

        public TKFontTest()
            : base(new DisplayMode(400, 600), "TKFontTest")
        {
            for (int i = 6; i < 10; i++)
            {
                textureFontList.Add(new TextureFont(new Font(FontFamily.GenericSansSerif, i)));
            }
        }

        public override void OnLoad(EventArgs e)
        {
            GL.ClearColor(Color.Black);
        }

        public override void OnUnload(EventArgs e)
        {
            textHandle.Dispose();
            foreach (TextureFont textureFont in textureFontList)
            {
                textureFont.Dispose();
            }
        }

        float[] viewport = new float[6];
        protected override void OnResize(OpenTK.Platform.ResizeEventArgs e)
        {
            GL.Viewport(0, 0, Width, Height);
            GL.GetFloat(GetPName.Viewport, viewport);
            GL.MatrixMode(MatrixMode.Projection);
            GL.LoadIdentity();
            GL.Ortho(viewport[0], viewport[2], viewport[3], viewport[1], 0.0, 1.0);

            GL.MatrixMode(MatrixMode.Modelview);
            GL.LoadIdentity();
        }

        public override void OnRenderFrame(RenderFrameEventArgs e)
        {
            GL.Clear(ClearBufferMask.ColorBufferBit);
            GL.LoadIdentity();

            textPrinter.Begin();

            GL.Translate(5, 5, 0);

            foreach (string str in text)
            {
                foreach (TextureFont textureFont in textureFontList)
                {
                    textPrinter.Prepare(str, textureFont, out textHandle);

                    RectangleF measureTextRectangle = textureFont.MeasureText(str);
                    GL.Color3(0.25f, 0.25f, 0.25f);
                    GL.Disable(EnableCap.Texture2D);
                    GL.Rect(0, 0, measureTextRectangle.Width, measureTextRectangle.Height);
                    GL.Enable(EnableCap.Texture2D);

                    GL.Color3(Color.White);
                    GL.PushMatrix();
                    //GL.Translate(-measureTextRectangle.X, -measureTextRectangle.Y, 0.0f);
                    textPrinter.Draw(textHandle);
                    GL.PopMatrix();

                    GL.Translate(0, measureTextRectangle.Height + 5, 0);
                }
            }

            textPrinter.End();

            SwapBuffers();
        }

        [STAThread]
        public static void Main()
        {
            try
            {
                using (TKFontTest tkFontTest = new TKFontTest())
                {
                    tkFontTest.Run(30.0, 0.0);
                }
            }
            catch{}
        }
    }
}