/*******************\
|  GTK3 Calculator  |
|  By Alnotz        |
\*******************/
/*
gcc -Wall -Wextra -o gtk3_calc gtk3_calc.c $(pkg-config --libs --cflags gtk+-3.0)
*/
#include <stdio.h>
#include <gtk/gtk.h>
#include <gtk3_calc.h>
#define B_COLS 4
#define B_ROWS 3
/*Terminal output*/
static void clicked(GtkWidget *button, gpointer data)
{
  const gchar* blabel=gtk_button_get_label(GTK_BUTTON (button));
  g_print("%s\n", blabel);
}
/*Window output*/
static void clickedOutput(GtkWidget *label, GtkWidget *button)
{
  const gchar* blabel=strcat((char *) gtk_label_get_label(GTK_LABEL (label)),
    (char *) gtk_button_get_label(GTK_BUTTON (button)));
  gtk_label_set_label(GTK_LABEL (label), blabel);
}

/*Window building*/
static void activate(GtkApplication* app, gpointer user_data)
{
  /*Objects list*/
  GtkWidget *window;
  GtkWidget *box;
  GtkWidget *label;
  GtkWidget *frame;
  GtkWidget *grid;
  GtkWidget *button;
  GtkWidget *buttonQuit;
  char l_string[4];
  int l_count;
  /*Window*/
  window=gtk_application_window_new(app);
  gtk_window_set_title(GTK_WINDOW (window), "Fenêtre");
  gtk_container_set_border_width(GTK_CONTAINER (window), 10);
  /*Box*/
  box=gtk_box_new(GTK_ORIENTATION_VERTICAL, 2);
  gtk_container_add(GTK_CONTAINER (window), box);
  /*Text output*/
  label=gtk_label_new(NULL);
  gtk_container_add(GTK_CONTAINER (box), label);
  /*Grid frame*/
  frame=gtk_frame_new("Grille à boutons");
  gtk_frame_set_shadow_type(GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
  gtk_container_add(GTK_CONTAINER (box), frame);
  gtk_widget_set_halign(frame, GTK_ALIGN_CENTER);
  /*Buttons grid*/
  grid=gtk_grid_new();
  gtk_grid_set_column_homogeneous(GTK_GRID (grid), TRUE);
  gtk_grid_set_column_spacing(GTK_GRID (grid), 2);
  gtk_grid_set_row_homogeneous(GTK_GRID (grid), TRUE);
  gtk_grid_set_row_spacing(GTK_GRID (grid), 2);
  gtk_container_add(GTK_CONTAINER (frame), grid);
  /*Buttons*/
  for(int l=0; l<B_ROWS; l++)
  {
    for(int c=0; c<B_COLS; c++)
    {
      l_count=l+c*B_ROWS;
      switch(l_count)
      {
        case 10:
          sprintf(l_string, "+");
          break;
        case 11:
          sprintf(l_string, "-");
          break;
        case 12:
          sprintf(l_string, "*");
          break;
        default:
          sprintf(l_string, "%d", l_count);
          break;
      }
      button=gtk_button_new_with_label(l_string); 
      g_signal_connect(button, "clicked", G_CALLBACK (clicked), NULL);
      g_signal_connect_swapped(button, "clicked", G_CALLBACK (clickedOutput), label);
      gtk_grid_attach(GTK_GRID (grid), button, (gint) l, (gint) c, 1, 1);
    }
  }
  /*Quit button*/
  buttonQuit=gtk_button_new_with_label("Quit");
  g_signal_connect_swapped(buttonQuit, "clicked", G_CALLBACK (gtk_widget_destroy), window);
  gtk_box_pack_end(GTK_BOX (box), buttonQuit, FALSE, TRUE, 2);
  gtk_widget_set_halign(buttonQuit, GTK_ALIGN_CENTER);

  gtk_widget_show_all(window);
}

/*Application*/
int main( int argc, char* argv[])
{
  printf("DÉBUT\n");
  GtkApplication *app;
  int status;

  app=gtk_application_new("fr.alnotz.gtk3_calc", G_APPLICATION_FLAGS_NONE);
  g_signal_connect(app, "activate", G_CALLBACK (activate), NULL);
  status=g_application_run(G_APPLICATION (app), argc, argv);
  g_object_unref(app);
  printf("FIN\n");
  return status;
}