using OpenTK.Graphics.OpenGL4;
using OpenTK.Windowing.Common;
using OpenTK.Windowing.Desktop;

namespace Voxel
{
    public class Window(int width, int height, string title) : GameWindow(GameWindowSettings.Default, new NativeWindowSettings() { ClientSize = (width, height), Title = title })
    {
        public readonly int Width = width;
        public readonly int Height = height;
        public uint frames = 0;
        public double timeElapsed = 0;

        // testing
        public Chunk Chunk;
        private Dictionary<int, bool> _cache = new Dictionary<int, bool>();
        private bool chunkEmpty = false;

        protected override void OnUpdateFrame(FrameEventArgs e)
        {
            base.OnUpdateFrame(e);

            if (Input.GetKey(OpenTK.Windowing.GraphicsLibraryFramework.Keys.Escape))
            {
                Close();
            }

            RemoveRandomBlocks();
        }

        private void RemoveRandomBlocks()
        {
            if (Chunk != null && !chunkEmpty)
            {
                Random rng = new Random();

                int GetNum()
                {
                    int max = 4096;
                    int num = rng.Next(max);
                    if (_cache.ContainsKey(num)) return GetNum();
                    _cache[num] = true;
                    if (_cache.Count == max) chunkEmpty = true;
                    return num;
                }

                Chunk.SetBlockIndex(GetNum(), Blocks.Air);
            }

            Renderer.ClearFaces();
            Renderer.AddFaces(Chunk.GetChunkMesh().Faces);
        }

        protected override void OnRenderFrame(FrameEventArgs e)
        {
            base.OnRenderFrame(e);

            GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);

            frames++;
            timeElapsed += e.Time;
            if (timeElapsed >= 1)
            {
                Console.WriteLine("FPS: " + frames.ToString());
                timeElapsed = 0;
                frames = 0;
            }

            Camera.Update((float)e.Time);
            Renderer.Render();

            SwapBuffers();
        }

        protected override void OnFramebufferResize(FramebufferResizeEventArgs e)
        {
            base.OnFramebufferResize(e);

            Camera.UpdateProjection(e.Width, e.Height);

            GL.Viewport(0, 0, e.Width, e.Height);
        }

        protected override void OnLoad()
        {
            base.OnLoad();

            GL.ClearColor(0.72f, 0.88f, 0.97f, 1f);

            GL.Enable(EnableCap.CullFace);
            GL.Enable(EnableCap.DepthTest);
            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);

            CursorState = CursorState.Grabbed;
            VSync = VSyncMode.On;

            Camera.UpdateProjection(Width, Height);
        }

        protected override void OnMouseMove(MouseMoveEventArgs e)
        {
            base.OnMouseMove(e);

            Camera.UpdateMouse(e.Delta);
        }

        protected override void OnKeyUp(KeyboardKeyEventArgs e)
        {
            base.OnKeyUp(e);
            Input.SetKey(e.Key, false);
        }

        protected override void OnKeyDown(KeyboardKeyEventArgs e)
        {
            base.OnKeyDown(e);
            Input.SetKey(e.Key, true);
        }
    }
}