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


/* we need to remember our widget pointers so we can tinker with'em */
typedef struct {
	GtkWidget* gold;
	GtkWidget* silver;
	GtkWidget* bronze;
	GtkWidget* result;
	int score;
} prog_data;

void set_score( GtkWidget *widget, gpointer data)
{
	int score = *((int*)data);
	char string[4];

	g_snprintf(string, 4, "%d", score);
 
	gtk_label_set_text(GTK_LABEL(widget), string);
}

void quit( GtkWidget *widget, gpointer data )
{
	gtk_main_quit();
}

void calculate( GtkWidget *widget, gpointer data )
{
	prog_data bits = *((prog_data*)data);
	int gold = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(bits.gold));
	int silver = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(bits.silver));
	int bronze = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(bits.bronze));
	((prog_data*)data)->score = gold * 3 + silver * 2 + bronze;

	set_score(bits.result, &(((prog_data*)data)->score));
}

/* another callback */
gint delete_event( GtkWidget *widget, GdkEvent *event, gpointer data )
{
	gtk_main_quit ();
	return FALSE;
}


int main( int argc, char *argv[] )
{
	GtkWidget* window;
	GtkWidget* new_widget;
	GtkWidget* table;
	GtkWidget* base;
	GtkWidget* result;
	prog_data mydata;


	mydata.score = 0;
	

	/* This is called in all GTK applications. Arguments are parsed
	 * from the command line and are returned to the application. */
	gtk_init (&argc, &argv);

	/* Create a new window */
	window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

	/* This is a new call, which just sets the title of our
	 * new window to "Hello Buttons!" */
	gtk_window_set_title (GTK_WINDOW (window), "Olympic Scorer");

	/* Here we just set a handler for delete_event that immediately
	 * exits GTK. */
	g_signal_connect (G_OBJECT (window), "delete_event",
			  G_CALLBACK (delete_event), NULL);

	/* Sets the border width of the window. */
	gtk_container_set_border_width (GTK_CONTAINER (window), 10);

	table = gtk_table_new(4, 2, FALSE);
	gtk_table_set_row_spacings(GTK_TABLE(table), 10);

	/* Put the table into the main window. */
	gtk_container_add (GTK_CONTAINER (window), table);

	/* put in gold medal stuff */
	new_widget = gtk_label_new ("Gold medals: ");
	gtk_table_attach_defaults(GTK_TABLE(table), new_widget, 0, 1, 0, 1);
	gtk_widget_show (new_widget);
	new_widget = gtk_spin_button_new_with_range (0, 100, 1);
	g_signal_connect(G_OBJECT(new_widget), "value_changed", 
			G_CALLBACK(calculate), &mydata);
	gtk_table_attach_defaults(GTK_TABLE(table), new_widget, 1, 2, 0, 1);
	gtk_widget_show (new_widget);
	mydata.gold = new_widget;

	/* put in silver medal stuff */
	new_widget = gtk_label_new ("Silver medals: ");
	gtk_table_attach_defaults(GTK_TABLE(table), new_widget, 0, 1, 1, 2);
	gtk_widget_show (new_widget);
	new_widget = gtk_spin_button_new_with_range (0, 100, 1);
	g_signal_connect(G_OBJECT(new_widget), "value_changed", 
			G_CALLBACK(calculate), &mydata);
	gtk_table_attach_defaults(GTK_TABLE(table), new_widget, 1, 2, 1, 2);
	gtk_widget_show (new_widget);
	mydata.silver = new_widget;

	/* put in bronze medal stuff */
	new_widget = gtk_label_new ("Bronze medals: ");
	gtk_table_attach_defaults(GTK_TABLE(table), new_widget, 0, 1, 2, 3);
	gtk_widget_show (new_widget);
	new_widget = gtk_spin_button_new_with_range (0, 100, 1);
	g_signal_connect(G_OBJECT(new_widget), "value_changed", 
			G_CALLBACK(calculate), &mydata);
	gtk_table_attach_defaults(GTK_TABLE(table), new_widget, 1, 2, 2, 3);
	gtk_widget_show (new_widget);
	mydata.bronze = new_widget;

	/* make a vbox for the result hbox and the quit button */
	base = gtk_vbox_new(FALSE, 10);
	gtk_table_attach_defaults(GTK_TABLE(table), base, 0, 2, 3, 4);

	/* fill out the result hbox */
	result = gtk_hbox_new(FALSE, 10);

	new_widget = gtk_label_new ("Score is: ");
	gtk_box_pack_start (GTK_BOX(result), new_widget, TRUE, TRUE, 0);
	gtk_widget_show (new_widget);

	/* results box */
	new_widget = gtk_label_new("");
	gtk_box_pack_start (GTK_BOX(result), new_widget, TRUE, TRUE, 0);
	gtk_widget_show (new_widget);
	mydata.result = new_widget;

	new_widget = gtk_button_new_with_label("Calculate score");
	g_signal_connect(G_OBJECT(new_widget), "clicked", 
			G_CALLBACK(calculate), &mydata);
	gtk_box_pack_start(GTK_BOX(result), new_widget, TRUE, TRUE, 0);
	gtk_widget_show (new_widget);

	gtk_box_pack_start(GTK_BOX(base), result, TRUE, TRUE, 0);
	gtk_widget_show(result);

	/* and add a quit button */
	new_widget = gtk_button_new_with_label("Exit");
	g_signal_connect(G_OBJECT(new_widget), "clicked", 
			G_CALLBACK(quit), "");
	gtk_box_pack_start(GTK_BOX(base), new_widget, TRUE, TRUE, 0);
	gtk_widget_show (new_widget);

	gtk_widget_show(base);

	gtk_widget_show (table);

	gtk_widget_show (window);
	
	/* Rest in gtk_main and wait for the fun to begin! */
	gtk_main ();

	return 0;
}