using Dashboard.Drawing;
using System.Drawing;
using Dashboard.Drawing.OpenGL;
using OpenTK.Graphics;
using OpenTK.Platform;
using OpenTK.Graphics.OpenGL;
using OpenTK.Mathematics;
using TK = OpenTK.Platform.Toolkit;
using Vector3 = System.Numerics.Vector3;

TK.Init(new ToolkitOptions()
{
    ApplicationName = "Dashboard Test Application",
    Windows = new ToolkitOptions.WindowsOptions()
    {
        EnableVisualStyles = true,
        IsDPIAware = true,
    }
});

WindowHandle wnd = TK.Window.Create(new OpenGLGraphicsApiHints()
{
    Version = new Version(3, 2),
    ForwardCompatibleFlag = true,
    DebugFlag = true,
    Profile = OpenGLProfile.Core,
    sRGBFramebuffer = true,

    SwapMethod = ContextSwapMethod.Undefined,

    RedColorBits = 8,
    GreenColorBits = 8,
    BlueColorBits = 8,
    AlphaColorBits = 8,

    SupportTransparentFramebufferX11 = true,
});
TK.Window.SetTitle(wnd, "Dashboard Test Application");
TK.Window.SetMinClientSize(wnd, 300, 200);
TK.Window.SetClientSize(wnd, new Vector2i(320, 240));
TK.Window.SetBorderStyle(wnd, WindowBorderStyle.ResizableBorder);

OpenGLContextHandle context = TK.OpenGL.CreateFromWindow(wnd);

TK.OpenGL.SetCurrentContext(context);
TK.OpenGL.SetSwapInterval(1);

GLLoader.LoadBindings(new Pal2BindingsContext(TK.OpenGL, context));

DrawQueue queue = new DrawQueue();
SolidBrush fg = new SolidBrush(Color.Black);
SolidBrush bg = new SolidBrush(Color.White);
bool shouldExit = false;

GLEngine engine = new GLEngine();
engine.Initialize();

GlContext dbGlContext = new GlContext(wnd, context);
ContextExecutor executor = engine.GetExecutor(dbGlContext);

EventQueue.EventRaised += (handle, type, eventArgs) =>
{
    if (handle != wnd)
        return;

    switch (type)
    {
        case PlatformEventType.Close:
            shouldExit = true;
            break;
    }
};

TK.Window.SetMode(wnd, WindowMode.Normal);

while (!shouldExit)
{
    TK.Window.ProcessEvents(true);

    TK.Window.GetFramebufferSize(wnd, out Vector2i framebufferSize);

    queue.Clear();
    queue.Point(Vector3.Zero, 2f, fg);
    queue.Line(Vector3.Zero, Vector3.One * 2, 2f, bg);
    queue.Rect(Vector3.UnitX, 2 * Vector3.UnitX + Vector3.UnitY, fg, bg, 2f);

    GL.Viewport(0, 0, framebufferSize.X, framebufferSize.Y);
    GL.ClearColor(0.3f, 0.3f, 0.3f, 1.0f);
    GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);

    executor.Draw(queue);
    executor.EndFrame();

    TK.OpenGL.SwapBuffers(context);
}

class GlContext : IGLContext
{
    public WindowHandle Window { get; }
    public OpenGLContextHandle Context { get; }
    public int ContextGroup { get; } = -1;

    public Size FramebufferSize
    {
        get
        {
            TK.Window.GetFramebufferSize(Window, out Vector2i framebufferSize);
            return new Size(framebufferSize.X, framebufferSize.Y);
        }
    }

    public event Action? Disposed;

    public GlContext(WindowHandle window, OpenGLContextHandle context)
    {
        Window = window;
        Context = context;

        OpenGLContextHandle? shared = TK.OpenGL.GetSharedContext(context);
        if (shared != null)
        {
            ContextGroup = _contexts.IndexOf(shared);
        }
        else
        {
            _contexts.Add(context);
        }
    }

    private static readonly List<OpenGLContextHandle> _contexts = new List<OpenGLContextHandle>();
}