#include <gtk/gtk.h>
#include "calc.h"
/*
    Tesses Calculator a PEMDAS calculator (with mod)
    Copyright (C) 2023 Mike Nolan

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
GtkWidget* number;
void truncatezeros(char* c)
{
    size_t pos = strlen(c) - 1;
    while(pos >= 0 && c[pos] == '0' )
    {
        
        c[pos] = 0;
        
        pos--;
        if(pos >= 0 && c[pos] == '.')
        {
            c[pos] = 0;
        }
    }
   
}
void calculate_answer(GtkWidget* calculate,gpointer data)
{
   const char* text= gtk_entry_get_text(GTK_ENTRY(number));
   bool error=false;
   double val=calc(text,&error);
   char myNumber[1000];
   if(error)
   {
      snprintf(myNumber,1000,"error");
   }
   else
   {
      snprintf(myNumber,1000,"%f",val);
      truncatezeros(myNumber);
   }
    
   gtk_entry_set_text(GTK_ENTRY(number),myNumber);
}

int
main (int    argc,
      char **argv)
{
    GtkWidget* window; 
    GtkWidget* grid;
    GtkWidget* calculate;
    gtk_init(&argc,&argv);
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    g_signal_connect(window,"destroy",G_CALLBACK(gtk_main_quit),NULL);

    grid = gtk_grid_new();
    gtk_container_add(GTK_CONTAINER(window),grid);
    number = gtk_entry_new();
    
    gtk_grid_attach(GTK_GRID(grid),number,0,0,1,1);
    
    calculate = gtk_button_new_with_label("Calculate");
     gtk_widget_set_hexpand (calculate, TRUE);
    gtk_widget_set_halign (calculate, GTK_ALIGN_CENTER);
    g_signal_connect(calculate,"clicked",G_CALLBACK(calculate_answer),NULL);
    gtk_grid_attach(GTK_GRID(grid),calculate,0,1,1,1);
    gtk_window_set_title(GTK_WINDOW(window),"Tesses Calculator");
    gtk_window_set_default_size(GTK_WINDOW(window),320,-1);
    gtk_widget_show_all(window);
    gtk_main();
    return 0;
}