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

#define MAXTEST 100000000

typedef struct WidgetBank
{
    GtkWidget *window;
    GtkWidget *fixedspace;
    GtkWidget *button;
    GtkWidget *PrimeToFind;
    GtkWidget *readoutCount;
    GtkWidget *readoutPrime;
    GtkEntryBuffer *PrimeToFindBuffer;
} Widgets;

int isitprime(unsigned long int index);

static void destroy (GtkWidget *window, gpointer data)
{
    gtk_main_quit ();
}
//callback function that starts prime finder and updates labels in main window
static void FindNthPrime (GtkWidget *button, gpointer data)
{
    Widgets *widgets = data;
    gchar primesfoundresults[100], currentprimesresults[100];
    int check = 0, primecount = 0, currentprime = 0;
    unsigned long int x = 0;
    //get address of text in box
    const gchar *PrimeToFind = (gtk_entry_buffer_get_text(widgets->PrimeToFindBuffer));
    //put the ascii data at that address into an int
    check = atoi(PrimeToFind);
    //Here's the actual finding of the Nth prime
    for (x = 2; x <= MAXTEST; x++)
    {
        if (isitprime(x))
        {
            currentprime = x;
            sprintf(currentprimesresults, "Current Prime:%i", currentprime);
            gtk_label_set_text((GtkLabel *)widgets->readoutPrime, currentprimesresults);
            primecount++;
            sprintf(primesfoundresults, "Primes Found:%i", (primecount +1));
            gtk_label_set_text((GtkLabel *)widgets->readoutCount, primesfoundresults);

        }
        if ((primecount+1) == check) {break;}
    }

}

int main (int argc, char *argv[])
{
    //GtkWidget *window, *fixedspace, *button, *readoutCount, *readoutPrime;

    gtk_init (&argc, &argv);

    Widgets PE7_Widgets;
    //Set up widget pointers
    PE7_Widgets.window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    PE7_Widgets.fixedspace = gtk_fixed_new();
    PE7_Widgets.button = gtk_button_new_with_label("Start");
    PE7_Widgets.readoutCount = gtk_label_new("Primes Found: 0");
    PE7_Widgets.readoutPrime = gtk_label_new("Current Prime: 0");
    PE7_Widgets.PrimeToFindBuffer = gtk_entry_buffer_new(NULL, -1);
    PE7_Widgets.PrimeToFind = gtk_entry_new_with_buffer(PE7_Widgets.PrimeToFindBuffer);

    //pack and set up locations
    gtk_container_add(GTK_CONTAINER (PE7_Widgets.window), PE7_Widgets.fixedspace);
    gtk_fixed_put((GtkFixed *)PE7_Widgets.fixedspace, PE7_Widgets.button, 0, 0);
    gtk_fixed_put((GtkFixed *)PE7_Widgets.fixedspace, PE7_Widgets.readoutCount, 0, 30);
    gtk_fixed_put((GtkFixed *)PE7_Widgets.fixedspace, PE7_Widgets.readoutPrime, 0, 50);
    gtk_fixed_put((GtkFixed *)PE7_Widgets.fixedspace, PE7_Widgets.PrimeToFind, 45, 0);

    //connect signals for closing main window and the button
    g_signal_connect (G_OBJECT (PE7_Widgets.window), "destroy", G_CALLBACK (destroy), NULL);
    g_signal_connect (G_OBJECT (PE7_Widgets.button), "clicked", G_CALLBACK (FindNthPrime), &PE7_Widgets);

    //display and wait
    gtk_widget_show_all(PE7_Widgets.window);
    gtk_main ();
    return 0;
}