using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Tao.OpenGl;

namespace UI.Winforms
{
    public partial class WorldWindow : Form
    {
        public WorldWindow()
        {
            InitializeComponent();
            OpenGLContext.Visible = true;
            OpenGLContext.Dock = DockStyle.Fill;
        }

        private void WorldWindow_Load(object sender, EventArgs e)
        {
            
        }

        private void WorldWindow_FormClosing(object sender, FormClosingEventArgs e)
        {
            //We don't want the user closing down this form by clicking the X button
            if (e.CloseReason == CloseReason.UserClosing)
            {
                //Ideally, we'd call the main menu and "click" the World button
                //in the Window menu to hide the form
                e.Cancel = true;
            }
        }

        private void OpenGLContext_Load(object sender, EventArgs e)
        {
            WorldWindow_Resize();
        }

        private void OpenGLContext_Paint(object sender, PaintEventArgs e)
        {
            OpenGLPaint();
        }

        private void WorldWindow_VisibleChanged(object sender, EventArgs e)
        {
            if (Visible)
            {
                OpenGLContext.InitializeContexts();
                WorldWindow_Resize();
            }
        }

        private void FramesPerSecondTimer_Tick(object sender, EventArgs e)
        {
            //Ideally we need something to dynamically cap the 
            //drawing FPS to the Engine's FPS unless the user is
            //moving around the world, changing their view
            OpenGLPaint();
        }

        private void OpenGLPaint()
        {
            Gl.glClear(Gl.GL_COLOR_BUFFER_BIT);
            Gl.glLoadIdentity();
            Gl.glBegin(Gl.GL_TRIANGLES);
            Gl.glVertex2f(0, 0);
            Gl.glVertex2f(.5f, 1);
            Gl.glVertex2f(1, 0);
            Gl.glEnd();
        }

        private void OpenGLResize(int Width, int Height)
        {
            float AspectRatio = (float)Width / (float)Height;
            Gl.glViewport(0, 0, Width, Height);
            Gl.glMatrixMode(Gl.GL_PROJECTION);
            Gl.glLoadIdentity();
            Gl.glOrtho(0, AspectRatio, 0, 1, 10, -10);
            Gl.glMatrixMode(Gl.GL_MODELVIEW);
        }

        private void WorldWindow_Resize(object sender, EventArgs e)
        {
            WorldWindow_Resize();
        }
        
        private void WorldWindow_Resize()
        {
            int Width = System.Math.Max(1, OpenGLContext.Size.Width);
            int Height = System.Math.Max(1, OpenGLContext.Size.Height);
            OpenGLResize(Width, Height);
        }

        private void WorldWindow_Shown(object sender, EventArgs e)
        {
            WorldWindow_Resize();
        }
    }
}