#include <iostream>
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include "Window.h"

GLFWwindow* Window::window;
int Window::width = 0;
int Window::height = 0;

int Window::initialize(int width, int height, const char* title){
	glfwInit();
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
	glfwWindowHint(GLFW_RESIZABLE, GL_TRUE);
	//glfwWindowHint(GLFW_SAMPLES, 2);

	window = glfwCreateWindow(width, height, title, nullptr, nullptr);
	if (window == nullptr){
		std::cerr << "Failed to create GLFW Window" << std::endl;
		glfwTerminate();
		return -1;
	}
	glfwMakeContextCurrent(window);

	glewExperimental = GL_TRUE;
	if (glewInit() != GLEW_OK){
		std::cerr << "Failed to initialize GLEW" << std::endl;
		return -1;
	}
	glViewport(0,0, width, height);

	glClearColor(0.0f,0.0f,0.0f,1);
	glEnable(GL_DEPTH_TEST);
	glEnable(GL_CULL_FACE);
	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

	Window::width = width;
	Window::height = height;
	return 0;
}

void Window::setCursorMode(int mode){
	glfwSetInputMode(window, GLFW_CURSOR, mode);
}

void Window::terminate(){
	glfwTerminate();
}

bool Window::isShouldClose(){
	return glfwWindowShouldClose(window);
}

void Window::setShouldClose(bool flag){
	glfwSetWindowShouldClose(window, flag);
}

void Window::swapBuffers(){
	glfwSwapBuffers(window);
}