#include <gtk/gtk.h>
#include <math.h>
#include <cairo.h>
#include <stdio.h>

int fd;
int acclX, acclY, acclZ;
int gyroX, gyroY, gyroZ;
double acclX_scaled, acclY_scaled, acclZ_scaled;
double gyroX_scaled, gyroY_scaled, gyroZ_scaled;
GtkLabel *levelValue;
guint width, height;
GtkStyleContext *context;
GtkWidget *window, *rotationCircle;
GtkButton *buttonClose;
GtkBuilder *builder;
cairo_t *cr;
double DegreesToRadians( int degrees );
gdouble rotation = 0;

void closeMainWindow (GtkButton* button, gpointer user_data)
{
  gtk_main_quit();
}

double DegreesToRadians( int degrees )
{
    return((double)((double)degrees * ( M_PI/180 )));
}

gboolean drawCircle (GtkWidget *widget, cairo_t *cr, gpointer data)
{
    int radius;
    context = gtk_widget_get_style_context (rotationCircle);
    width = gtk_widget_get_allocated_width (rotationCircle);
    height = gtk_widget_get_allocated_height (rotationCircle);

    cairo_set_source_rgba (cr, 0, 0, 0, 0.3);
    cairo_set_line_width (cr, 5);

    if (width < height)
    {
      radius = width/2 - 4;
    }
    else
    {
      radius = height/2 - 4;
    }

    cairo_arc (cr, width / 2, height / 2, radius, 0, 2 * M_PI);
    cairo_stroke_preserve(cr);

    cairo_set_source_rgba (cr, 255, 255, 255, 0.6);
    cairo_fill (cr);

    cairo_rotate(cr, rotation);

    cairo_set_source_rgba (cr, 1, 0.2, 0.2, 0.6);
    cairo_set_line_width (cr, 6.0);
    cairo_line_to (cr, width / 2 - radius, height / 2);
    cairo_line_to (cr, width / 2 + radius, height / 2);
    cairo_stroke (cr);

    return FALSE;
}

gboolean updateRotation(GtkWidget *widget)
{
    rotation += DegreesToRadians(1);

    gtk_widget_queue_draw(widget);

   return TRUE;
}

gboolean updateLevel(GtkWidget *widget)
{
    gchar tmpbuf[100];
    sprintf(tmpbuf , "%.2d",rand());
    gtk_label_set_text (GTK_LABEL(levelValue), tmpbuf);

   return TRUE;
}

int main(int argc, char *argv[])
{
  gtk_init (&argc, &argv);

  builder = gtk_builder_new ();
  gtk_builder_add_from_file (builder, "Main.glade", NULL);

  window = GTK_WIDGET(gtk_builder_get_object (builder, "mainWindow"));
  buttonClose = GTK_BUTTON(gtk_builder_get_object (builder, "buttonClose"));
  levelValue = GTK_LABEL(gtk_builder_get_object (builder, "levelValue"));
  rotationCircle = GTK_WIDGET(gtk_builder_get_object (builder, "draw"));

  gtk_builder_connect_signals (builder, NULL);
  gtk_window_maximize (GTK_WINDOW(window));

  g_timeout_add(1000, (GSourceFunc) updateRotation, rotationCircle);
  g_timeout_add(500, (GSourceFunc) updateLevel, NULL);

  gtk_widget_show (window);

  gtk_main ();
  return 0;
}