using Dashboard.Drawing;
using System.Drawing;
using System.Text;
using Dashboard;
using Dashboard.Drawing.OpenGL;
using Dashboard.Drawing.OpenGL.Text;
using Dashboard.ImmediateUI;
using OpenTK.Graphics;
using OpenTK.Platform;
using OpenTK.Graphics.OpenGL;
using OpenTK.Mathematics;
using Box2d = Dashboard.Box2d;
using TK = OpenTK.Platform.Toolkit;
using sys = System.Numerics;
using otk = OpenTK.Mathematics;

TK.Init(new ToolkitOptions()
{
    ApplicationName = "DashTerm",
    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,
    Multisamples = 0,

    SupportTransparentFramebufferX11 = true,
});
TK.Window.SetTitle(wnd, "DashTerm");
TK.Window.SetMinClientSize(wnd, 300, 200);
TK.Window.SetClientSize(wnd, new Vector2i(320, 240));
TK.Window.SetBorderStyle(wnd, WindowBorderStyle.ResizableBorder);
// TK.Window.SetTransparencyMode(wnd, WindowTransparencyMode.TransparentFramebuffer, 0.1f);

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.FromArgb(0, 0, 0, 0));
SolidBrush bg = new SolidBrush(Color.Black);
bool shouldExit = false;

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

GlContext dbGlContext = new GlContext(wnd, context);
ContextExecutor executor = engine.GetExecutor(dbGlContext);
DimUI dimUI = new DimUI(new DimUIConfig()
{
    Font = new NamedFont("Noto Sans", 9f),
});

Vector2 mousePos = Vector2.Zero;
Random r = new Random();
EventQueue.EventRaised += (handle, type, eventArgs) =>
{
    if (handle != wnd)
        return;

    switch (type)
    {
        case PlatformEventType.Close:
            shouldExit = true;
            break;
        case PlatformEventType.MouseMove:
            mousePos = ((MouseMoveEventArgs)eventArgs).ClientPosition;
            break;
    }
};

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

List<Vector3> points = new List<Vector3>();

IFont font = Typesetter.LoadFont("Nimbus Mono", 12f);
StringBuilder builder = new StringBuilder();

while (!shouldExit)
{
    TK.Window.ProcessEvents(true);
    TK.Window.GetFramebufferSize(wnd, out Vector2i framebufferSize);
    executor.BeginFrame();

    dimUI.Begin(new Box2d(0, 0, framebufferSize.X, framebufferSize.Y), queue);
    dimUI.Text("Hello World!");
    dimUI.Button("Cancel"); dimUI.SameLine();
    dimUI.Button("OK");

    dimUI.Input("type me!", builder);

    dimUI.BeginMenu();

    if (dimUI.MenuItem("File"))
    {
        dimUI.BeginMenu();
        dimUI.MenuItem("New Window");
        dimUI.MenuItem("Preferences");
        dimUI.MenuItem("Exit");
        dimUI.EndMenu();
    }

    if (dimUI.MenuItem("Edit"))
    {
        dimUI.BeginMenu();
        dimUI.MenuItem("Cut");
        dimUI.MenuItem("Copy");
        dimUI.MenuItem("Paste");

        if (dimUI.MenuItem("Send Char"))
        {
            dimUI.BeginMenu();
            dimUI.EndMenu();
        }

        dimUI.EndMenu();
    }

    if (dimUI.MenuItem("View"))
    {
        dimUI.BeginMenu();
        dimUI.MenuItem("Clear");

        if (dimUI.MenuItem("Set Size"))
        {
            dimUI.BeginMenu();
            dimUI.MenuItem("24 x 40");
            dimUI.MenuItem("25 x 40");
            dimUI.MenuItem("24 x 80");
            dimUI.MenuItem("25 x 80");
            dimUI.MenuItem("25 x 120");
            dimUI.EndMenu();
        }

        dimUI.EndMenu();
    }

    dimUI.Finish();

    GL.Viewport(0, 0, framebufferSize.X, framebufferSize.Y);
    GL.ClearColor(0.3f, 0.3f, 0.3f, 1.0f);
    GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
    GL.Disable(EnableCap.DepthTest);
    GL.Enable(EnableCap.Blend);
    GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
    GL.ColorMask(true, true, true, true);

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

    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>();
}