using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using Blacklight.Core;
using Glass.Blacklight;

namespace Glass.Testbed
{
    internal static class Program
    {
        public const string NoVerticalSyncSwitch = "--novsync";

        public const string ManualVerticalSyncSwitch = "--manualvsync";

        static string GetPreferredAdapter()
        {
            try
            {
                using (var reader = System.IO.File.OpenText("Blacklight.Testbed.PreferredAdapter.txt"))
                {
                    return reader.ReadLine();
                }
            }
            catch(Exception)
            {
                return null;
            }
        }

        static VerticalSyncMode GetVerticalSyncMode(string[] args)
        {
            if (args.Contains(NoVerticalSyncSwitch))
            {
                return VerticalSyncMode.Off;
            }

            return args.Contains(ManualVerticalSyncSwitch) ? VerticalSyncMode.Manual : VerticalSyncMode.Driver;
        }

        static void Main(string[] args)
        {
            string preferredAdapterName = GetPreferredAdapter();

            global::Blacklight.Core.GraphicsAdapterManager.Singleton.ForceStartup();

            if (global::Blacklight.Core.GraphicsAdapterManager.Singleton.Modules.Count == 0)
            {
                System.Windows.Forms.MessageBox.Show(
                    "Could not locate any Blacklight graphics addapters (eg: DirectX).  Will now exit.",
                    "Critical Error");
                return;
            }

            global::Blacklight.Core.GraphicsAdapterManager.Singleton.SetCurrentModule(
                preferredAdapterName ?? global::Blacklight.Core.GraphicsAdapterManager.Singleton.Modules.First());

            global::Blacklight.Core.GraphicsAdapterManager.Singleton.CurrentModule.VerticalSync =
                GetVerticalSyncMode(args);

            Application.Run(new Testbed());
        }
    }
}