using System.Numerics;
using System.Runtime.InteropServices;
using Raylib_cs;


public class RenderDevice
{
    public int width { get; private set; }
    public int height { get; private set; }
    
    private int screenWidth, screenHeight;
    
    private Texture2D renderTarget;
    private IntPtr pixelPtr;
    private byte[] pixelData;
    public RenderDevice(int width, int height, int screenWidth, int screenHeight)
    {
        this.width = width;
        this.height = height;
        this.screenWidth = screenWidth;
        this.screenHeight = screenHeight;
        
        Image image = Raylib.GenImageColor(width, height, Color.Black);
        renderTarget = Raylib.LoadTextureFromImage(image);
        Raylib.UnloadImage(image); 
        
        pixelData = new byte[width * height * 4];
        pixelPtr = Marshal.AllocHGlobal(pixelData.Length);

    }

    public void render()
    {
        Marshal.Copy(pixelData, 0, pixelPtr, pixelData.Length);
        unsafe
        {
            Raylib.UpdateTexture(renderTarget, (void*)pixelPtr);
        }
        
        Raylib.DrawTexturePro(renderTarget, new Rectangle(0,0, width, height), new Rectangle(0, 0, screenWidth, screenHeight), Vector2.Zero, 0f, Color.White);
    }
    
    public void SetPixel(int x, int y, float3 color)
    {
        int idx = (y * width + x) * 4;
        pixelData[idx] = (byte)color.r;
        pixelData[idx + 1] = (byte)color.g;
        pixelData[idx + 2] = (byte)color.b;
        pixelData[idx + 3] = 0xFF;
    }

    public void cleanup()
    {
        Raylib.UnloadTexture(renderTarget);
        Marshal.FreeHGlobal(pixelPtr); // always free after upload
    }
}