//----------------------------------------------------------------------------//
//                                                                            //
//                                callback                                    //
//                                                                            //
//  Copyright © 2021 Libre en Communs (contact@a-lec.org)                     //
//  Copyright © 2024 Jean Sirmai (jean@a-lec.org)                             //
//  Copyright © 2024 Adrien Bourmault (neox@a-lec.org)                        //
//                                                                            //
//  This file is part of gem-graph.                                           //
//                                                                            //
//  This program is free software: you can redistribute it and/or modify     //
//  it under the terms of the GNU Affero 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 Affero General Public License for more details.                      //
//                                                                           //
//  You should have received a copy of the GNU Affero General Public License //
//  along with this program.  If not, see <https://www.gnu.org/licenses/>.   //
//---------------------------------------------------------------------------//


#include <stdio.h>
#include <gtk-4.0/gtk/gtk.h>

#include "../include/callback.h"
#include "../include/contain.h"
#include "../include/tree.h"
#include "../include/contain.h"
#include "../include/dialog.h"
#include "../include/texts.h"
#include "../include/base.h"
#include "../include/parsing.h"
#include "../include/graph_area.h"


/******************************************************************************/
/*                   W I N D O W S    A C T I V A T I O N S                   */
/******************************************************************************/

static GtkWindow *main_window, *dialog_window;


void on_main_window_activation (GtkApplication *app,
                                gpointer no_user_data)
{
  main_window = GTK_WINDOW (gtk_application_window_new (app));
  main_window_design (main_window);
  g_signal_connect (app,
                    "activate",
                    G_CALLBACK (on_dialog_window_activation),
                    main_window);
}


void on_dialog_window_activation (GtkApplication *app,
                                  gpointer no_user_data)
{
  dialog_window = GTK_WINDOW (gtk_application_window_new (app));
  dialog_window_design (main_window,
                        dialog_window);
}


static void on_auto_notification (const char *message)
{
  /*  Ignored (2024-06-06)  because I don't know how to get "main_window" easily

    if (window->toast_revealer == NULL) {
        g_printerr("Can't find app->toast_overlay !\n");
        return;
    }

    if (window->toast_text == NULL) {
        g_printerr("Can't find app->toast_overlay !\n");
        return;
    }

    gtk_label_set_label(window->toast_text, message);
    gtk_revealer_set_reveal_child(window->toast_revealer, true);
  */
    g_printerr("%s\n", message);
}


/******************************************************************************/
/*                                T R E E                                     */
/******************************************************************************/

void on_user_tree_expander_toggled (GtkExpander *expander,
                                    gpointer user_data)
{
  GtkTreeListRow *row = GTK_TREE_LIST_ROW (user_data);
  gboolean is_expanded = gtk_tree_list_row_get_expanded (row);
  gtk_tree_list_row_set_expanded (row,
                                  !is_expanded);
}


void on_bind_user_tree_factory (GtkSignalListItemFactory *factory,
                                GObject* object,
                                gpointer user_data)
{
  GtkListItem *list_item = GTK_LIST_ITEM (object);
  assert (list_item);

  GtkTreeListRow *row = gtk_list_item_get_item (list_item);
  assert (row); // if (row != NULL) {...}  do something ?

  const gchar *text = gtk_string_object_get_string (
                      GTK_STRING_OBJECT (gtk_tree_list_row_get_item (row)));
  GtkWidget *expander = gtk_list_item_get_child (list_item);
  gtk_expander_set_label (GTK_EXPANDER (expander), text);
  g_signal_handlers_disconnect_by_func (expander,
                                        G_CALLBACK (on_user_tree_expander_toggled),
                                        row);
  g_signal_connect (expander,
                    "activate",
                    G_CALLBACK (on_user_tree_expander_toggled),
                    row);
  gtk_widget_set_margin_start (expander,
                               gtk_tree_list_row_get_depth(row) * 20);
}


/******************************************************************************/
/*                              G L  A R E A                                  */
/******************************************************************************/

gboolean on_glarea_render(GtkGLArea *area,
                          GdkGLContext *context)
{
    // Check if the widget is a glarea
    if(gtk_gl_area_get_error(area) != NULL) {
        on_auto_notification("An OpenGL error occured !");
        return false;
    }

    if (ui_render_stack(gtk_widget_get_parent(GTK_WIDGET(area))) == false) {
        on_auto_notification("Failed to render corresponding graphic stack !");
        return false;
    }

    return true;
}


/* We need to set up our state when we realize the GtkGLArea widget */
void on_glarea_realize(GtkWidget *widget)
{
    GError *internal_error = NULL;

    // Make the GL context current to be able to call the GL API
    gtk_gl_area_make_current(GTK_GL_AREA(widget));

    // Check if the widget is a glarea
    if(gtk_gl_area_get_error(GTK_GL_AREA(widget)) != NULL) {
        on_auto_notification("An OpenGL error occured !");
        return;
    }

    // Link graphical stack to widget
    if (ui_init_graphic_stack(gtk_widget_get_parent(widget),
                              internal_error) == false) {
        on_auto_notification(
            "Failed to link the graphic stack to widgets !");
        return;
    }

    gtk_gl_area_set_auto_render(GTK_GL_AREA(widget), true);
}

/* We should tear down the state when unrealizing */
void on_glarea_unrealize(GtkWidget *widget)
{
    GError *internal_error = NULL;

    // Make the GL context current to be able to call the GL API
    gtk_gl_area_make_current(GTK_GL_AREA(widget));

    // Check if the widget is a glarea
    if(gtk_gl_area_get_error(GTK_GL_AREA(widget)) != NULL) {
        on_auto_notification("An OpenGL error occured !");
        return;
    }

    // Destroy graphic stack
    if (ui_shutdown_graphic_stack(gtk_widget_get_parent(widget),
                                  internal_error) == false) {
        on_auto_notification(
            "Failed to shutdown the graphic stack !");
        return;
    }
}

void on_axis_value_change(GtkAdjustment *adjustment, gpointer data)
{

    GtkWidget *slider = gtk_widget_get_parent(GTK_WIDGET(data));
    GtkWidget *container_widget = gtk_widget_get_parent(GTK_WIDGET(slider));

    const gchar *label_text = gtk_label_get_label(GTK_LABEL(data));

    // THANKS ASCIIIII/Unicode/Whateverrr !
    int axis = label_text[0] - 'X';

    g_assert(axis >= 0 && axis < N_AXIS);

    /* Update the rotation angle */
    ui_update_axis_stack(container_widget,
                         axis,
                         gtk_adjustment_get_value(adjustment));

    /* Update the contents of the GL drawing area */
}


/******************************************************************************/
/*                             B U T T O N S                                  */
/******************************************************************************/

static void switch_STATE_RULES_DATA() {

    switch (get_STATE_RULES_DATA()) {

    case (STATE) :
      gtk_window_set_child (main_window, GTK_WIDGET (get_window_child_STATE()));
      break;

    case (RULES) :
      gtk_window_set_child (main_window, GTK_WIDGET (get_window_child_RULES()));
      break;

    case (DATA)  :
      gtk_window_set_child (main_window, GTK_WIDGET (get_window_child_DATA()));
      break;

    default :
      printf("default in callback.on_toggle_STATE_RULES_DATA()\n");
  }
}

void on_toggle_EXEC_EDIT (GtkWidget *toggled_button, gpointer user_data) {

  if (get_EXEC_EDIT ()) {

    gtk_button_set_icon_name (GTK_BUTTON (toggled_button),
                              "power-profile-balanced-rtl-symbolic");
    set_EXEC_EDIT (EXEC);

  } else {

    gtk_button_set_icon_name (GTK_BUTTON (toggled_button),
                              "text-editor-symbolic");

    //  https://docs.gtk.org/gtk4/class.Window.html    TODO   2024-06-30
    gtk_window_present (GTK_WINDOW (dialog_window));   //   works once only !

    set_EXEC_EDIT (EDIT);
  }

  switch_STATE_RULES_DATA();
}

void on_toggle_STATE_RULES_DATA (GtkWidget *toggled_button, gpointer user_data) {

  const char *toggled_button_name
                = gtk_check_button_get_label  (GTK_CHECK_BUTTON (toggled_button));
  int is_active = gtk_check_button_get_active (GTK_CHECK_BUTTON (toggled_button));

  if (! strcmp (toggled_button_name, "state")) {
    set_STATE_RULES_DATA (STATE);
  }

  if (! strcmp (toggled_button_name, "rules")) {
    set_STATE_RULES_DATA (RULES);
  }

  if (! strcmp (toggled_button_name, "data analysis")) {
    set_STATE_RULES_DATA (DATA);
  }

  if (is_active) {
    switch_STATE_RULES_DATA();
  }
}

void on_SAVE_CURRENT_MODEL_BEFORE_EDITING (GtkWidget *btt_SAVE_CURRENT_MODEL,
                                           gpointer data) {
  gtk_widget_set_sensitive (GTK_WIDGET (data),
                            TRUE);
  printf ("callback.c (line 294)  -  SAVE_CURRENT_MODEL_BEFORE_EDITING\n");
}

void on_DISCARD_CURRENT_MODEL_AND_START_EDITING (GtkWidget *btt_SAVE_CURRENT_MODEL,
                                                 gpointer data) {
  gtk_window_close (GTK_WINDOW (data));
  printf ("callback.c (line 300)  -  DISCARD_CURRENT_MODEL_AND_START_EDITING\n");
}

void on_WRITE_CURRENT_MODEL (GtkWidget *btt_WRITE_CURRENT_MODEL,
                             gpointer data) {
  gtk_window_close (GTK_WINDOW (data));
  printf ("callback.c (line 306)  -  WRITE_CURRENT_MODEL\n");
}