#include <gl3w/GL/gl3w.h> // Must be included first
#include "render.hpp"
#include "config.hpp"
#include <cstdio>

namespace{
	void handle_resize_event(GLFWwindow*, int width, int height){
		debug_print("Window resized\n");
		glViewport(0, 0, width, height);
	}
}


render_manager::render_manager() :
	m_window_close_callback(nullptr),
	m_input_handler(nullptr),
	m_main_window(nullptr){}

render_manager::renderer_error render_manager::init (int width, int height, const char* title){
	if(!glfwInit()){
		fprintf(stderr, "[EE] failed to initialize GLFW.\n");
		return RENDERER_INIT_ERROR;
	}

	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

	m_main_window = glfwCreateWindow(width, height, title, nullptr, nullptr);
	if(!m_main_window){
		fprintf(stderr, "[EE] Could not create window\n");
		return RENDERER_WINDOW_ERROR;
	}

	glfwMakeContextCurrent(m_main_window);
	if(gl3wInit()){
		fprintf(stderr, "[EE] failed to initialize OpenGL\n");
		return RENDERER_CONTEXT_ERROR;
	}

	glViewport(0, 0, width, height);

	debug_print("[DD] OpenGL %s, GLSL %s\n", glGetString(GL_VERSION), glGetString(GL_SHADING_LANGUAGE_VERSION));

	glfwSetFramebufferSizeCallback(m_main_window, handle_resize_event);

	return RENDERER_OK;
}

void render_manager::update(){
	glfwSwapBuffers(m_main_window);
	glfwPollEvents();
}

void render_manager::request_exit(){
	if(m_window_close_callback)
		m_window_close_callback();
	glfwSetWindowShouldClose(m_main_window, GLFW_TRUE);
}