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

namespace Lodestone.TestBed
{
    public partial class MainWindow : Form
    {
        public class DemoHandle
        {
            public Type Demo;

            public Demo Create()
            {
                return (Demo)System.Activator.CreateInstance(Demo);
            }

            public override string ToString()
            {
                return Demo.Name;
            }
        }

        Demo currentDemo;
        
        public MainWindow()
        {
            InitializeComponent();

            var types = System.Reflection.Assembly.GetExecutingAssembly().GetTypes();
            var demos = types
                .Where(x => x.IsClass && x.IsSubclassOf(typeof(Demo)))
                .Select(x => new DemoHandle
                {
                    Demo = x,
                })
                .ToArray();

            DemoSelector.Items.AddRange(demos);

            if (DemoSelector.Items.Count != 0)
            {
                DemoSelector.SelectedIndex = 0;
            }

            viewport.DrawableSurface.Invalidated += delegate(object sender, EventArgs e)
            {
                var scene = currentDemo.Draw();

                viewport.DrawableSurface.FrameReset();
                viewport.DrawableSurface.DrawScene(scene, viewport.Camera);
                viewport.DrawableSurface.SubmitDrawCalls();
            };

            viewport.DrawableSurface.BackgroundColor = new Blacklight.Core.Color(0, 123.0 / 255.0, 204.0 / 255.0);

            // To force an update, since the zoom was set through the designer and thus too soon to cause an update.
            viewport.Zoom = viewport.Zoom;
        }

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

        private void GameLoopTimer_Tick(object sender, EventArgs e)
        {
            viewport.DrawableSurface.Invalidate();
        }

        private void DemoSelector_SelectedIndexChanged(object sender, EventArgs e)
        {
            var demoHandle = (DemoHandle)DemoSelector.SelectedItem;

            currentDemo = demoHandle.Create();
            currentDemo.Initialize();

            if(_currThread != null)
            {
                _currThread.Abort();
                _currThread.Join();
                _currThread = null;
            }

            _currThread = new System.Threading.Thread(delegate()
            {
                while (true)
                {
                    var watch = new System.Diagnostics.Stopwatch();
                    watch.Start();
                    currentDemo.Step(1.0 / 60.0);
                    var elapsed = watch.ElapsedTicks;

                    timeLabel.BeginInvoke(new Action(() =>
                    {
                        timeLabel.Text = "Elapsed MS: " + 1000.0 * elapsed / (double)System.Diagnostics.Stopwatch.Frequency;
                    }));

                    System.Threading.Thread.Sleep((int)Math.Max(0, 1000 / 60 - watch.ElapsedMilliseconds));
                }
            });

            _currThread.Start();
        }

        private void DemoStartButton_Click(object sender, EventArgs e)
        {
            var demoHandle = (DemoHandle)DemoSelector.SelectedItem;

            currentDemo = demoHandle.Create();
            currentDemo.Initialize();
        }

        System.Threading.Thread _currThread = null;

        private void MainWindow_FormClosing(object sender, FormClosingEventArgs e)
        {
            _currThread.Abort();
            _currThread.Join();
        }
    }
}