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 * $Id: menu_export_layer.c 1300 2008-04-18 17:18:30Z vapour $
 * Salasaga: Function called when the user selects Export -> Image Layer from the top menu 
 * Copyright (C) 2005-2008 Justin Clift <justin@salasaga.org>
 * This file is part of Salasaga.
 * Salasaga is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser 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
 * GNU Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/>.

// Standard includes
#include <stdlib.h>

// GTK includes
#include <gtk/gtk.h>

// Salasaga includes
#include "../salasaga_types.h"
#include "../externs.h"
#include "display_warning.h"
#include "validate_value.h"
#include "widgets/time_line.h"

void menu_export_layer(void)
      // Local variables
      GtkFileFilter           *all_filter;                        // Filter for *.*
      GtkWidget               *export_dialog;                     // Dialog widget
      gchar                   *filename;                          // Pointer to the chosen file name
      GtkFileFilter           *file_filter;                       // Filter for *.swf
      GList                   *layer_pointer;                     // Points to the layers in the selected slide
      gint                    return_code_gbool;                  // Catches the return code from the inner swf export function
      guint                   selected_row;                       // Holds the row that is selected
      slide                   *slide_data;                        // Pointer to current slide data
      layer_image             *this_image_ob;                     // Temporary image layer object
      layer                   *this_layer;                        // Temporary layer
      gboolean                useable_input;                      // Used to control loop flow
      GString                       *validated_string;                  // Receives known good strings from the validation function
      GtkWidget               *warn_dialog;                       // Widget for overwrite warning dialog

      GString                       *tmp_gstring;                       // Temporary GString

      // Initialise some variables
      slide_data = (slide *) current_slide->data;
      layer_pointer = slide_data->layers;

      // Determine which layer the user has selected in the timeline
      selected_row = time_line_get_selected_layer_num(slide_data->timeline_widget);
      this_layer = g_list_nth_data(layer_pointer, selected_row);

      // Is the selected layer anything other than an image layer
      if (TYPE_GDK_PIXBUF != this_layer->object_type)
            display_warning("Error ED116: Only image layers can be exported to an image file.");

      // * Pop open a dialog asking the user for their desired filename *

      // Create the dialog asking the user for the name to save as
      export_dialog = gtk_file_chooser_dialog_new("Export Slide as Image",
                                    GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
                                    GTK_STOCK_SAVE, GTK_RESPONSE_ACCEPT,

      // Create the filter so only *.png files are displayed
      file_filter = gtk_file_filter_new();
      gtk_file_filter_add_pattern(file_filter, "*.png");
      gtk_file_filter_set_name(file_filter, "Portable Network Graphics (*.png)");
      gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(export_dialog), file_filter);

      // Create the filter so all files (*.*) can be displayed
      all_filter = gtk_file_filter_new();
      gtk_file_filter_add_pattern(all_filter, "*.*");
      gtk_file_filter_set_name(all_filter, "All files (*.*)");
      gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(export_dialog), all_filter);

      // Set the name of the file to save as
      tmp_gstring = g_string_new(NULL);
      g_string_printf(tmp_gstring, "%s.png", project_name->str);
      gtk_file_chooser_set_current_name(GTK_FILE_CHOOSER(export_dialog), tmp_gstring->str);

      // Change to the default output directory
      gtk_file_chooser_set_current_folder(GTK_FILE_CHOOSER(export_dialog), output_folder->str);

      // Loop around until we have a valid filename or the user cancels out
      useable_input = FALSE;
      validated_string = NULL;
            // Get a filename to save as
            if (gtk_dialog_run(GTK_DIALOG(export_dialog)) != GTK_RESPONSE_ACCEPT)
                  // The dialog was cancelled, so free the memory allocated in this function, destroy the dialog, and return to the caller
                  g_string_free(tmp_gstring, TRUE);

            // Retrieve the filename from the dialog box
            filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(export_dialog));

            // Free the validated_string variable before recreating it
            if (NULL != validated_string)
                  g_string_free(validated_string, TRUE);
                  validated_string = NULL;

            // Validate the filename input
            validated_string = validate_value(FILE_PATH, V_CHAR, filename);
            if (NULL == validated_string)
                  // Invalid file name
                  display_warning("Error ED184: There was something wrong with the file name given.  Please try again.");
            } else
                  // * Valid file name, so check if there's an existing file of this name, and give an Overwrite? type prompt if there is
                  if (TRUE == g_file_test(validated_string->str, G_FILE_TEST_EXISTS))
                        // Something with this name already exists
                        warn_dialog = gtk_message_dialog_new(GTK_WINDOW(main_window),
                                                      GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
                                                      "Overwrite existing file?");
                        if (GTK_RESPONSE_YES == gtk_dialog_run(GTK_DIALOG(warn_dialog)))
                              // We've been told to overwrite the existing file
                              useable_input = TRUE;
                  } else
                        // The indicated file name is unique, we're fine to save
                        useable_input = TRUE;
      } while (FALSE == useable_input);

      // * We only get to here if a file was chosen *

      // Destroy the dialog box, as it's not needed any more

      // Export the image
      this_image_ob = (layer_image *) this_layer->object_data;
      return_code_gbool = gdk_pixbuf_save(GDK_PIXBUF(this_image_ob->image_data), validated_string->str, "png", NULL, "tEXt::Software", "Salasaga: http://www.salasaga.org", NULL);
      if (FALSE == return_code_gbool)
            // Something went wrong when saving the image file
            display_warning("Error ED117: Something went wrong when saving the image file.");
      } else
            // Image file was created successfully, so update the status bar to let the user know
            g_string_printf(tmp_gstring, " Wrote image file - %s", validated_string->str);
            gtk_statusbar_push(GTK_STATUSBAR(status_bar), statusbar_context, tmp_gstring->str);

      // * Function clean up area *

      // Frees the memory holding the file name

      // Free the temporary gstring
      g_string_free(tmp_gstring, TRUE);
      g_string_free(validated_string, TRUE);

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