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 * $Id: menu_export_slide.c 1322 2008-04-20 22:39:13Z vapour $
 * Salasaga: Function called when the user selects Export -> Slide as Image 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/>.

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

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

void menu_export_slide(void)
      // Local variables
      GtkFileFilter           *all_filter;                        // Filter for *.*
      gfloat                        cursor_position;
      GtkWidget               *export_dialog;                     // Dialog widget
      GError                        *error = NULL;                      // Pointer to error return structure
      gchar                   *filename;                          // Pointer to the chosen file name
      GtkFileFilter           *file_filter;                       // Filter for *.swf
      gboolean                return_code_gbool;                  // Catches the return code of the g_pixbuf_save function
      GdkPixbuf               *slide_pixbuf;                      // Image of the slide workspace
      GString                       *tmp_gstring;                       // Temporary GString
      GdkPixmap               *tmp_pixmap;                        // Used when converting from a pixmap to a pixbuf
      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

      // * 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 ED183: 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

      // Get the current time line cursor position
      cursor_position = time_line_get_cursor_position(((slide *) current_slide->data)->timeline_widget);

      // Create a new pixbuf of the current slide at its cursor time position
      tmp_pixmap = compress_layers(current_slide, cursor_position, project_width, project_height);
      slide_pixbuf = gdk_pixbuf_get_from_drawable(NULL, GDK_PIXMAP(tmp_pixmap), NULL, 0, 0, 0, 0, -1, -1);

      // Save the image as a png file
      return_code_gbool = gdk_pixbuf_save(GDK_PIXBUF(slide_pixbuf), validated_string->str, "png", &error, "tEXt::Software", "Salasaga: http://www.salasaga.org", NULL);
      if (FALSE == return_code_gbool)
            // Something went wrong when saving the image file
            display_warning("Error ED115: 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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