#include "Application.h"

#include "Exception.h"

#include "Util.h"

Application::Application(int width, int height)
	: m_screen_size(width, height)
{
	if (width < 0 || height < 0)
		throw EXCEPTION("Invalid screen dimensions");

	if (!glfwInit())
		throw EXCEPTION("Unable to Initialize GLFW");

	m_p_window = glfwCreateWindow(width, height, "OpenGLEngine", NULL, NULL);
	if (!m_p_window)
	{
		glfwTerminate();
		throw EXCEPTION("Unable to Create GLFW Window");
	}

	glfwSwapInterval(1);

	glfwMakeContextCurrent(m_p_window);

	glewExperimental = GL_TRUE;
	GLenum glew_err = glewInit();
	if (glew_err != GLEW_OK)
	{
		glfwTerminate();
		throw EXCEPTION("Unable to Initialize GLEW: " + std::string((char*)glewGetErrorString(glew_err)));
	}

	// Output Version Information
	OutputDebugString("\nOpenGL Version Information:\nRenderer: ");
	OutputDebugString((char*)glGetString(GL_RENDERER));
	OutputDebugString("\nOpenGL Version: ");
	OutputDebugString((char*)glGetString(GL_VERSION));
	OutputDebugString("\n\n");

	// TODO: Mouse Movement, Mouse Scroll
	m_glfw_input_manager.init(m_p_window);
	glfwSetKeyCallback(m_p_window, &GLFWInputManager::key_callback);

	m_fps.prepare();
}

int Application::run()
{
	try
	{
		init();
		while (!glfwWindowShouldClose(m_p_window))
		{
			// Handle all messages
			m_glfw_input_manager.mark();
			glfwPollEvents();
			float delta_time = m_fps.mark();
			clock_t clock = m_fps.get_clock();
			update(delta_time, clock);
			prerender();
			render();
			CHECK_GL_ERR();
			glfwSwapBuffers(m_p_window);
		}

		return 0;
	}
	catch (Exception& e)
	{
		glfwTerminate();
		throw e;
	}
}

void Application::base_close()
{
	close();
}