#include <config.h>
#include <gtk/gtk.h>
#include <gtk/gtkgl.h>
#include <gdk/gdkkeysyms.h>
#include <GL/gl.h>
#include <math.h>

static gboolean expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data);
static gboolean rotate(gpointer user_data);

static GtkWidget *rotate_button;

float boxv[][3] = {
	{ -0.5, -0.5, -0.5 },
	{  0.5, -0.5, -0.5 },
	{  0.5,  0.5, -0.5 },
	{ -0.5,  0.5, -0.5 },
	{ -0.5, -0.5,  0.5 },
	{  0.5, -0.5,  0.5 },
	{  0.5,  0.5,  0.5 },
	{ -0.5,  0.5,  0.5 }
};
#define ALPHA 0.5

static float ang = 30.;

static gboolean expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
{
	GdkGLContext *glcontext = gtk_widget_get_gl_context (da);
	GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (da);

	/* draw in here */
	glPushMatrix();
	
	glRotatef (ang, 1, 0, 1);

	glShadeModel(GL_FLAT);

	glBegin (GL_LINES);
	glColor3f (1., 0., 0.);
	glVertex3f (0., 0., 0.);
	glVertex3f (1., 0., 0.);
	glEnd ();
	
	glBegin (GL_LINES);
	glColor3f (0., 1., 0.);
	glVertex3f (0., 0., 0.);
	glVertex3f (0., 1., 0.);
	glEnd ();
	
	glBegin (GL_LINES);
	glColor3f (0., 0., 1.);
	glVertex3f (0., 0., 0.);
	glVertex3f (0., 0., 1.);
	glEnd ();

	glBegin(GL_LINES);
	glColor3f (1., 1., 1.);
	glVertex3fv(boxv[0]);
	glVertex3fv(boxv[1]);
	
	glVertex3fv(boxv[1]);
	glVertex3fv(boxv[2]);
	
	glVertex3fv(boxv[2]);
	glVertex3fv(boxv[3]);
	
	glVertex3fv(boxv[3]);
	glVertex3fv(boxv[0]);
	
	glVertex3fv(boxv[4]);
	glVertex3fv(boxv[5]);
	
	glVertex3fv(boxv[5]);
	glVertex3fv(boxv[6]);
	
	glVertex3fv(boxv[6]);
	glVertex3fv(boxv[7]);
	
	glVertex3fv(boxv[7]);
	glVertex3fv(boxv[4]);
	
	glVertex3fv(boxv[0]);
	glVertex3fv(boxv[4]);
	
	glVertex3fv(boxv[1]);
	glVertex3fv(boxv[5]);
	
	glVertex3fv(boxv[2]);
	glVertex3fv(boxv[6]);
	
	glVertex3fv(boxv[3]);
	glVertex3fv(boxv[7]);
	glEnd();

	glPopMatrix ();

	return FALSE;
}

static gboolean rotate(gpointer user_data)
{
	if (!gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(rotate_button)))
		return TRUE;

	GtkWidget *da = GTK_WIDGET (user_data);

	ang++;

	gdk_window_invalidate_rect(da->window, &da->allocation, FALSE);
	gdk_window_process_updates(da->window, FALSE);

	return TRUE;
}

gboolean cube_init(GtkDrawingArea *drawing, GtkNotebook *config)
{
	/* Add configuration tab */
	GtkWidget *label = gtk_label_new("Cube");
	rotate_button = gtk_toggle_button_new_with_label("Rotate");
	gtk_notebook_append_page(GTK_NOTEBOOK(config), rotate_button, label);

	/* Set up OpenGL Stuff */
	g_signal_connect(drawing, "expose-event", G_CALLBACK(expose), NULL);
	g_timeout_add(1000/60, rotate, drawing);
}