package com.mojang.blaze3d.opengl;

import com.mojang.blaze3d.GLFWErrorCapture.Error;
import com.mojang.blaze3d.platform.MacosUtil;
import com.mojang.blaze3d.shaders.GpuDebugOptions;
import com.mojang.blaze3d.shaders.ShaderSource;
import com.mojang.blaze3d.systems.BackendCreationException;
import com.mojang.blaze3d.systems.GpuBackend;
import com.mojang.blaze3d.systems.GpuDevice;
import com.mojang.blaze3d.systems.BackendCreationException.Reason;
import java.util.Locale;
import org.jspecify.annotations.Nullable;
import org.lwjgl.glfw.GLFW;

public class GlBackend implements GpuBackend {
	private static final int VERSION_MAJOR = 3;
	private static final int VERSION_MINOR = 3;

	@Override
	public String getName() {
		return "OpenGL";
	}

	@Override
	public void setWindowHints() {
		GLFW.glfwWindowHint(139265, 196609);
		GLFW.glfwWindowHint(139275, 221185);
		GLFW.glfwWindowHint(139266, 3);
		GLFW.glfwWindowHint(139267, 3);
		GLFW.glfwWindowHint(139272, 204801);
		GLFW.glfwWindowHint(139270, 1);
	}

	@Override
	public void handleWindowCreationErrors(@Nullable final Error error) throws BackendCreationException {
		if (error != null) {
			if (error.error() == 65542) {
				throw new BackendCreationException("Driver does not support OpenGL", Reason.OPENGL_MISSING);
			} else if (error.error() == 65543) {
				throw new BackendCreationException("Driver does not support OpenGL 3.3", Reason.OPENGL_MISSING);
			} else {
				throw new BackendCreationException(String.format(Locale.ROOT, "GLFW_ERROR: 0x%X", error.error()), Reason.OPENGL_MISSING);
			}
		} else {
			throw new BackendCreationException("Failed to create window with OpenGL context", Reason.OPENGL_MISSING);
		}
	}

	@Override
	public GpuDevice createDevice(
		final long window, final ShaderSource defaultShaderSource, final GpuDebugOptions debugOptions, final Runnable criticalShaderLoader
	) {
		if (MacosUtil.IS_MACOS) {
			MacosUtil.setWindowColorSpaceForOpenGLBecauseGLFWDoesnt(window);
		}

		return new GpuDevice(new GlDevice(window, defaultShaderSource, debugOptions), criticalShaderLoader);
	}
}