#include <glad/glad.h> // Include GLAD before GLFW
#include <GLFW/glfw3.h>
#include <iostream>

// Callback to resize the viewport when the window is resized
void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
    (void)window; // Unused parameter
	glViewport(0, 0, width, height);
}

int main() {
	// 1. Initialize GLFW
	glfwInit();
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

	// 2. Create the Window
	GLFWwindow *window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
	if (window == NULL) {
		std::cout << "Failed to create GLFW window" << std::endl;
		glfwTerminate();
		return -1;
	}
	glfwMakeContextCurrent(window);
	glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);

	// 3. Initialize GLAD (Load function pointers)
	if (!gladLoadGLLoader(reinterpret_cast<GLADloadproc>(glfwGetProcAddress))){
		std::cout << "Failed to initialize GLAD" << std::endl;
		return -1;
	}

	// 4. The Render Loop
	while (!glfwWindowShouldClose(window)) {
		// Input
		if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
			glfwSetWindowShouldClose(window, true);

		// Rendering commands here
		glClearColor(0.2f, 0.3f, 0.3f, 1.0f); // Set clear color (Teal)
		glClear(GL_COLOR_BUFFER_BIT);         // Clear the screen

		// Swap buffers and poll IO events
		glfwSwapBuffers(window);
		glfwPollEvents();
	}

	// 5. Clean up
	glfwTerminate();
	return 0;
}