/* -*-c-*- -------------- mixgtk_mixvm.c :
 * Implementation of the functions declared in mixgtk_mixvm.h
 * ------------------------------------------------------------------
 *  Last change: Time-stamp: "01/03/08 23:22:49 jose"
 * ------------------------------------------------------------------
 * Copyright (C) 2001 Free Software Foundation, Inc.
 *  
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *  
 */

#include <mixlib/xmix_vm.h>
#include "mixgtk_widgets.h"
#include "mixgtk_mixvm.h"

/* register widgets */
#define REGISTER_NO_ (MIXGTK_WIDGET_rI6 - MIXGTK_WIDGET_rA + 1)

static GtkEntry *reg_entries_[REGISTER_NO_];
static GtkToggleButton *over_button_;
static GtkToggleButton *cmp_buttons_[3];
static GtkCList *memory_;
static mix_vm_t *vm_;


static void
update_register_ (mixgtk_widget_id_t reg)
{
  static gchar BUFFER[20];
  switch (reg)
    {
    case MIXGTK_WIDGET_rA:
      mix_word_print_to_buffer (mix_vm_get_rA (vm_), BUFFER);
      break;
    case MIXGTK_WIDGET_rX:
      mix_word_print_to_buffer (mix_vm_get_rX (vm_), BUFFER);
      break;
    case MIXGTK_WIDGET_rJ:
      mix_short_print_to_buffer (mix_vm_get_rJ (vm_), BUFFER);
      break;
    case MIXGTK_WIDGET_rI1:
    case MIXGTK_WIDGET_rI2:
    case MIXGTK_WIDGET_rI3:
    case MIXGTK_WIDGET_rI4:
    case MIXGTK_WIDGET_rI5:
    case MIXGTK_WIDGET_rI6:
      mix_short_print_to_buffer (mix_vm_get_rI (vm_,
						reg - MIXGTK_WIDGET_rI1 + 1),
				 BUFFER);
      break;
    default:
      g_assert_not_reached ();
    }
  gtk_entry_set_text (reg_entries_[reg - MIXGTK_WIDGET_rA], BUFFER);
}


static void
on_mem_adj_change_ (GtkAdjustment *adj)
{
  mixgtk_mixvm_update_cells ();
}


/* initialise the mixvm widgets */
gboolean
mixgtk_mixvm_init (mix_vm_t *vm)
{
  int k;
  gchar *text[] = {"", ""};
  GtkWidget *scrol;
  GtkAdjustment *adj;
  
  g_return_val_if_fail (vm != NULL, FALSE);
  vm_ = vm;

  for (k = 0; k < REGISTER_NO_; ++k)
    {
      reg_entries_[k] =
	GTK_ENTRY (mixgtk_widget_factory_get (MIXGTK_WIDGET_rA + k));
      g_return_val_if_fail (reg_entries_[k] != NULL, FALSE);
    }

  over_button_ =
    GTK_TOGGLE_BUTTON (mixgtk_widget_factory_get (MIXGTK_WIDGET_OVER));
  g_return_val_if_fail (over_button_ != NULL, FALSE);

  for (k = 0; k < 3; ++k)
    {
      cmp_buttons_[k] =
	GTK_TOGGLE_BUTTON (mixgtk_widget_factory_get (MIXGTK_WIDGET_CMP_L +k));
      g_return_val_if_fail (cmp_buttons_[k] != NULL, FALSE);
    }

  memory_ = GTK_CLIST (mixgtk_widget_factory_get (MIXGTK_WIDGET_CELLS));
  g_return_val_if_fail (memory_ != NULL, FALSE);
  gtk_clist_set_column_justification (memory_, 0, GTK_JUSTIFY_CENTER);
  gtk_clist_set_column_justification (memory_, 1, GTK_JUSTIFY_CENTER);
  gtk_clist_freeze (memory_);
  for (k = 0; k< MIX_VM_CELL_NO; ++k)
    {
      gchar buffer[20];
      sprintf (buffer, "%04d", k);
      text[0] = buffer;
      gtk_clist_append (memory_, text);
    }
  gtk_clist_thaw (memory_);

  scrol = mixgtk_widget_factory_get_by_name ("memory_scroll");
  adj = gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (scrol));
  gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
		      GTK_SIGNAL_FUNC (on_mem_adj_change_), NULL);
  
  mixgtk_mixvm_update_vm_widgets ();
  
  return TRUE;
}


/* update register widgets */
void
mixgtk_mixvm_update_registers (void)
{
  gint k;
  for (k = MIXGTK_WIDGET_rA; k <= MIXGTK_WIDGET_rI6; ++k)
    update_register_ (k);
}

/* update the overflow toggle */
void
mixgtk_mixvm_update_over_toggle (void)
{
  g_assert (over_button_ != NULL);
  gtk_toggle_button_set_active (over_button_,
				mix_vm_get_overflow (vm_));
}

/* update the comparison flag */
void
mixgtk_mixvm_update_cmp (void)
{
  gint toggle;
  toggle = mix_vm_get_cmpflag (vm_);
  gtk_toggle_button_set_active (cmp_buttons_[toggle], TRUE);
}


/* update the memory cells */
void
mixgtk_mixvm_update_cells (void)
{
  static gchar BUFFER[20];
  gint k = 0;
  
  gtk_clist_freeze (memory_);
  
  while (gtk_clist_row_is_visible (memory_, k) == GTK_VISIBILITY_NONE) ++k;
  while (gtk_clist_row_is_visible (memory_, k) != GTK_VISIBILITY_NONE)
    {
      mix_word_print_to_buffer (mix_vm_get_addr_contents (vm_, k), BUFFER);
      gtk_clist_set_text (memory_, k, 1, BUFFER);
      ++k;
    }
  
  gtk_clist_thaw (memory_);
}


/* update all mixvm widgets */
void
mixgtk_mixvm_update_vm_widgets (void)
{
  mixgtk_mixvm_update_registers ();
  mixgtk_mixvm_update_over_toggle ();
  mixgtk_mixvm_update_cmp ();
  mixgtk_mixvm_update_cells ();
}


/* update cmp flag */
void
on_cmp_e_toggled (GtkWidget *widget, gpointer data)
{
  if (GTK_TOGGLE_BUTTON (widget)->active)
    mix_vm_set_cmpflag (vm_, mix_EQ);
}

void
on_cmp_l_toggled (GtkWidget *widget, gpointer data)
{
  if (GTK_TOGGLE_BUTTON (widget)->active)
    mix_vm_set_cmpflag (vm_, mix_LESS);
}

void
on_cmp_g_toggled (GtkWidget *widget, gpointer data)
{
  if (GTK_TOGGLE_BUTTON (widget)->active)
    mix_vm_set_cmpflag (vm_, mix_GREAT);
}

void
on_overflow_toggled (GtkWidget *widget, gpointer data)
{
  mix_vm_set_overflow (vm_, GTK_TOGGLE_BUTTON (widget)->active);
}