#include <gtk/gtk.h>


const double pi = 3.141592653589793;

GtkWidget *window;
GtkWidget *fixed;
GtkWidget *shape;
gboolean play = TRUE;
gboolean hidden = FALSE;

int x = 58;
int y = 75;
double mouse_x = 0.0;
double mouse_y = 0.0;


gboolean timeout(gpointer data) {
  if (play) {
    int w, h;
    gtk_widget_get_size_request(shape, &w, &h);
    
    if (x + w/2 < mouse_x) x += 5;
    if (x + w/2 > mouse_x) x -= 5;
    if (y + h/2 < mouse_y) y += 5;
    if (y + h/2 > mouse_y) y -= 5;
    
    gtk_fixed_move(GTK_FIXED(fixed), shape, x, y);
  }
  return TRUE;
}

gboolean restart_timeout(gpointer data) {
  play = TRUE;
  gdk_window_set_cursor(gtk_widget_get_window(window), NULL);
  gtk_widget_queue_draw(shape);
  return FALSE;
}

gboolean shape_draw(GtkWidget *widget, cairo_t *cr, gpointer data) {
  int w, h;
  gtk_widget_get_size_request(widget, &w, &h);
  
  cairo_set_source_rgba(cr, 0, 0, 1, 1);
  cairo_fill(cr);
  
  cairo_arc(cr, 10, 10, 10, -pi, -pi/2);
  cairo_line_to(cr, w-10, 0);
  cairo_arc(cr, w-10, 10, 10, -pi/2, 0);
  cairo_line_to(cr, w, h-10);
  cairo_arc(cr, w-10, h-10, 10, 0, pi/2);
  cairo_line_to(cr, 10, h);
  cairo_arc(cr, 10, h-10, 10, pi/2, pi);
  cairo_line_to(cr, 0, 10);
  
  if (play) cairo_set_source_rgba(cr, 1, 1, 1, 1);
       else cairo_set_source_rgba(cr, 1, 0, 0, 1);
  cairo_fill_preserve(cr);

  cairo_set_source_rgba(cr, 0, 0, 0, 1);
  cairo_stroke(cr);

  return TRUE;
}

gboolean shape_motion(GtkWidget *widget, GdkEventMotion *event, gpointer data) {
  play = FALSE;

  GdkCursor *cursor = gdk_cursor_new_from_name(gtk_widget_get_display(widget), "none");
  gdk_window_set_cursor(gtk_widget_get_window(window), cursor);
  g_object_unref(cursor);

  gtk_widget_queue_draw(shape);
  g_timeout_add(500, restart_timeout, NULL);
  return TRUE;
}

gboolean window_motion(GtkWidget *widget, GdkEventMotion *event, gpointer data) {
  if (!hidden) {
    mouse_x = event->x;
    mouse_y = event->y;
  }
  return TRUE;
}

gboolean shelter_enter(GtkWidget *widget, GdkEvent *event, gpointer data) {
  hidden = TRUE;
  return TRUE;
}

gboolean shelter_leave(GtkWidget *widget, GdkEvent *event, gpointer data) {
  hidden = FALSE;
  return TRUE;
}

void activate(GtkApplication* app, gpointer data) {
  window = gtk_application_window_new(app);
  g_signal_connect(window, "motion-notify-event", G_CALLBACK(window_motion), NULL);
  gtk_widget_add_events(window, GDK_POINTER_MOTION_MASK);
  gtk_window_set_default_size(GTK_WINDOW(window), 700, 500);
  
  fixed = gtk_fixed_new();
  gtk_container_add(GTK_CONTAINER(window), fixed);
  
  shape = gtk_drawing_area_new();
  g_signal_connect(shape, "draw", G_CALLBACK(shape_draw), NULL);
  g_signal_connect(shape, "motion-notify-event", G_CALLBACK(shape_motion), NULL);
  gtk_widget_add_events(shape, GDK_POINTER_MOTION_MASK);
  gtk_widget_set_size_request(shape, 86, 61);
  gtk_fixed_put(GTK_FIXED(fixed), shape, x, y);

  GtkWidget *button1 = gtk_button_new_with_label("Sweet Home");
  g_signal_connect(button1, "enter-notify-event", G_CALLBACK(shelter_enter), NULL);
  g_signal_connect(button1, "leave-notify-event", G_CALLBACK(shelter_leave), NULL);
  gtk_widget_add_events(button1, GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK);
  gtk_widget_set_size_request(button1, 249, 154);
  gtk_fixed_put(GTK_FIXED(fixed), button1, 48, 296);
  
  GtkWidget *button2 = gtk_button_new_with_label("Another Safe Place");
  g_signal_connect(button2, "enter-notify-event", G_CALLBACK(shelter_enter), NULL);
  g_signal_connect(button2, "leave-notify-event", G_CALLBACK(shelter_leave), NULL);
  gtk_widget_add_events(button2, GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK);
  gtk_widget_set_size_request(button2, 216, 131);
  gtk_fixed_put(GTK_FIXED(fixed), button2, 344, 131);

  gtk_widget_show_all(window);

  g_timeout_add(10, timeout, NULL);
}

int main(int argc, char **argv) {
  GtkApplication *application = gtk_application_new(NULL, 0);
  g_signal_connect(application, "activate", G_CALLBACK(activate), NULL);
  int status = g_application_run(G_APPLICATION(application), argc, argv);
  g_object_unref(application);
  return status;
}