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 * $Id: menu_screenshots_import.c 1512 2008-05-18 11:01:10Z vapour $
 * Salasaga: Function called when the user selects Screenshots -> Import 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>
#include <unistd.h>

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

#ifdef _WIN32
      // Windows only code
      #include <windows.h>

// Salasaga includes
#include "../salasaga_types.h"
#include "../externs.h"
#include "display_warning.h"
#include "draw_timeline.h"
#include "draw_workspace.h"
#include "enable_layer_toolbar_buttons.h"
#include "enable_main_toolbar_buttons.h"
#include "menu_enable.h"
#include "cairo/create_cairo_pixbuf_pattern.h"

void menu_screenshots_import(void)
      // Local variables
      GDir                    *dir_ptr;                           // Pointer to the directory entry structure
      const gchar             *dir_entry;                         // Holds a file name
      GSList                        *entries = NULL;              // Holds a list of screen shot file names
      GError                        *error = NULL;                      // Pointer to error return structure
      GdkPixbufFormat         *file_format;
      GtkTreeIter             film_strip_iter;
      gboolean                image_differences;                  // Used to indicate that screenshots have differing sizes
      gint                    image_height;
      gint                    image_width;
      guint                   largest_height = 0;                 // Holds the height of the largest screenshot thus far
      guint                   largest_width = 0;                  // Holds the width of the largest screenshot thus far
      GtkTreePath             *new_path;                          // Path used to select the new film strip thumbnail
      gint                    num_screenshots = 0;          // Switch to track if other screenshots already exist
      GtkTreePath             *old_path = NULL;             // The old path, which we'll free
      guint                   recent_message;                     // Message identifier, for newest status bar message
      gint                    return_code = 0;              // Receives return code
      gint                    return_code_int;
      gint                    slide_position;                     // Which slide in the slide list do we have selected?
      gboolean                using_first_screenshot;       // Used to indicate there's no project active, so we're using the dimensions of the first screenshot

      GtkWidget               *tmp_dialog;
      layer_image             *tmp_image_ob;                      // Temporary image layer
      gint                    tmp_int = 0;                        // Temporary integer
      layer                   *tmp_layer;                         // Temporary layer
      GdkRectangle            tmp_rect = {0, 0, status_bar->allocation.width, status_bar->allocation.height};  // Temporary rectangle covering the area of the status bar
      slide                   *tmp_slide;                         // Temporary slide
      GString                       *tmp_string;                        // Temporary string

      // Initialise various things
      tmp_string = g_string_new(NULL);
      image_differences = FALSE;
      using_first_screenshot = FALSE;

      // Set the default information button display info if there isn't a project already active
      if (TRUE != project_active)
            info_link = g_string_new("http://www.salasaga.org");
            info_link_target = g_string_new("_blank");
            info_text = gtk_text_buffer_new(NULL);
            gtk_text_buffer_set_text(GTK_TEXT_BUFFER(info_text), "Created using Salasaga", -1);
            info_display = TRUE;

      // * We know the path to get the screenshots from (screenshots_folder), and their prefix name (project_name),
      //   so we make a list of them and add them to the slides linked list *

      // * Check if the screenshots folder exists *
      if (!(dir_ptr = g_dir_open(screenshots_folder->str, 0, &error)))
            // * Something went wrong when opening the screenshots folder *
            if (G_FILE_ERROR_NOENT != error->code)
                  // * The error was something other than the folder not existing, which we could cope with *

                  // Display the warning message using our function
                  g_string_printf(tmp_string, "Error ED03: Something went wrong opening the screenshots folder '%s': %s", screenshots_folder->str, error->message);

                  // Free the memory allocated in this function
                  g_string_free(tmp_string, TRUE);

            // The screenshots folder doesn't exist.  Notify the user and direct them to change this in the preferences menu
            display_warning("Error ED04: The screenshots folder doesn't exist.  Please update this in the project preferences and try again");

      // * Scan the given directory for screenshot files to import *
      while ((dir_entry = g_dir_read_name(dir_ptr)) != NULL)
            // Look for files starting with the word "screenshot"
            if (g_str_has_prefix(dir_entry, "screenshot"))
                  // The directory entry starts with the correct prefix, now let's check the file extension
                  if (g_str_has_suffix(dir_entry, ".png"))
                        // * The directory entry has the correct file extension too, so it's very likely one of our screenshots *
                        g_string_printf(tmp_string, g_build_path(G_DIR_SEPARATOR_S, screenshots_folder->str, dir_entry, NULL));
                        file_format = gdk_pixbuf_get_file_info(tmp_string->str, &image_width, &image_height);
                        if (NULL != file_format)
                              // * The file format was recognised *

                              // If a project is already active, then we have existing dimensions we need to conform to
                              if ((TRUE == project_active) || (TRUE == using_first_screenshot))
                                    // Make a note if the width and height of this screenshot differs from the existing project dimensions
                                    if (image_width != project_width)
                                          image_differences = TRUE;
                                    if (image_height != project_height)
                                          image_differences = TRUE;
                              } else
                                    // There isn't a project loaded yet, so we take the dimensions of the first screenshot as the new project dimensions
                                    project_width = image_width;
                                    project_height = image_height;

                                    using_first_screenshot = TRUE;

                              // We add this screenshot to the list
                              entries = g_slist_append(entries, g_strdup_printf("%s", dir_entry));
                              num_screenshots += 1;

      // If screenshots of differing dimensions were found, warn the user and let them cancel out of the import
      if (TRUE == image_differences)
            if (TRUE == project_active)
                  g_string_printf(tmp_string, "Not all of the screenshots are of the same size, or some differ from the size of the project.  If you proceed, they will be scaled to the same size as the project.  Do you want to proceed?");
            } else
                  g_string_printf(tmp_string, "Not all of the screenshots are of the same size, or some differ from the size of the project.  If you proceed, they will all be scaled to the size of the first one.  Do you want to proceed?");

            // Display the warning dialog
            tmp_dialog = gtk_message_dialog_new(GTK_WINDOW(main_window), GTK_DIALOG_MODAL, GTK_MESSAGE_WARNING, GTK_BUTTONS_YES_NO, tmp_string->str);
            return_code_int = gtk_dialog_run(GTK_DIALOG(tmp_dialog));

            // Was the NO button pressed?
            if (GTK_RESPONSE_NO == return_code_int)
                  // * The user does not want to proceed *

                  // Destroy the dialog box and return

            // The user wants to proceed

      // If no screenshots were found, alert the user and return to the calling function
      if (0 == num_screenshots)
            // Display the warning message using our function
            g_string_printf(tmp_string, "Error ED05: No screenshots found in screenshot folder:\n\n  %s\n\nThey are case sensitive and must be named:\n\n  screenshot<Sequential Number>.png\n\ni.e.:\n\n\tscreenshot0001.png\n\tscreenshot0002.png", screenshots_folder->str);


      // Sort the screenshots in numeric order
      entries = g_slist_sort(entries, (GCompareFunc) g_ascii_strcasecmp);

      // Use the status bar to communicate the number of screenshots found
      g_string_printf(tmp_string, " Found %u screenshots", num_screenshots);
      recent_message = gtk_statusbar_push(GTK_STATUSBAR(status_bar), statusbar_context, tmp_string->str);

      // Redraw the main window
      gtk_widget_draw(status_bar, &tmp_rect);

      // * Load the screenshots *
      for (tmp_int = 1; tmp_int <= num_screenshots; tmp_int++)
            // Remove the previous status bar message
            gtk_statusbar_remove(GTK_STATUSBAR(status_bar), statusbar_context, recent_message);

            // * The loaded image file becomes a background layer image for a new slide *

            // Allocate a new slide structure for use
            tmp_slide = g_new(slide, 1);
            tmp_slide->layers = NULL;
            tmp_slide->duration = default_slide_duration;
            tmp_slide->scaled_cached_pixmap = NULL;
            tmp_slide->cached_pixmap_valid = FALSE;
            tmp_slide->num_layers = 1;

            // Allocate a new layer structure for use in the slide
            tmp_layer = g_new(layer, 1);
            tmp_layer->x_offset_start = 0;
            tmp_layer->y_offset_start = 0;
            tmp_layer->x_offset_finish = 0;
            tmp_layer->y_offset_finish = 0;
            tmp_layer->start_time = 0.0;
            tmp_layer->transition_in_type = TRANS_LAYER_NONE;
            tmp_layer->transition_in_duration = 0.0;
            tmp_layer->duration = default_slide_duration;  // Slide duration rather than layer duration, because these become slides
            tmp_layer->transition_out_type = TRANS_LAYER_NONE;
            tmp_layer->transition_out_duration = 0.0;

            // Work out the full path to the image file
            g_string_printf(tmp_string, "%s%c", screenshots_folder->str, G_DIR_SEPARATOR);
            tmp_string = g_string_append(tmp_string, g_slist_nth(entries, tmp_int - 1)->data);

            // * Create the new background layer *

            // Construct a new image object
            tmp_image_ob = g_new(layer_image, 1);
            if (FALSE == project_active)
                  // This is the first screenshot, so we make the project size the same dimensions as it
                  tmp_image_ob->image_data = gdk_pixbuf_new_from_file(tmp_string->str, NULL);  // Load the image again, at full size.  It's the background layer
                  project_width = gdk_pixbuf_get_width(tmp_image_ob->image_data);
                  project_height = gdk_pixbuf_get_height(tmp_image_ob->image_data);

                  // Set the global toggle that a project is now active
                  project_active = TRUE;
            } else
                  // This is not the first screenshot, so it will be loaded and scaled to the size of the existing project dimensions
                  tmp_image_ob->image_data = gdk_pixbuf_new_from_file_at_size(tmp_string->str, project_width, project_height, NULL);
            tmp_image_ob->width = project_width;
            tmp_image_ob->height = project_height;
            tmp_image_ob->modified = FALSE;

            // Create a cairo pattern from the image data
            tmp_image_ob->cairo_pattern = create_cairo_pixbuf_pattern(tmp_image_ob->image_data);
            if (NULL == tmp_image_ob->cairo_pattern)
                  // Something went wrong when creating the image pattern
                  display_warning("Error ED376: Couldn't create an image pattern");

            // Load the image file(s) into a thumbnail sized pixel buffer, then add it to the new slide structure
            tmp_slide->thumbnail = gdk_pixbuf_scale_simple(tmp_image_ob->image_data, preview_width, (guint) preview_width * 0.75, GDK_INTERP_TILES);
            if (NULL == tmp_slide->thumbnail)
                  // * Something went wrong when loading the screenshot *

                  // Display a warning message using our function
                  g_string_printf(tmp_string, "Error ED06: Something went wrong when loading the screenshot '%s'", tmp_string->str);
                  g_string_free(tmp_string, TRUE);


            // If the new image is larger than the others loaded, we keep the new dimensions
            if (tmp_image_ob->height > largest_height)
                  largest_height = tmp_image_ob->height;
            if (tmp_image_ob->width > largest_width)
                  largest_width = tmp_image_ob->width;

            // Wrap the background layer info around it
            tmp_layer->object_data = (GObject *) tmp_image_ob;
            tmp_layer->object_type = TYPE_GDK_PIXBUF;
            tmp_layer->visible = TRUE;
            tmp_layer->background = TRUE;
            tmp_layer->name = g_string_new("Background");
            tmp_layer->external_link = g_string_new(NULL);
            tmp_layer->external_link_window = g_string_new("_self");

            // Add the background layer to the new slide being created
            tmp_slide->layers = g_list_append(tmp_slide->layers, tmp_layer);

            // Mark the name for the slide as unset
            tmp_slide->name = NULL;

            // Set the timeline widget for the slide to NULL, so we know to create it later on
            tmp_slide->timeline_widget = NULL;

            // Add the thumbnail to the GtkListView based film strip
            gtk_list_store_append (film_strip_store, &film_strip_iter);  // Acquire an iterator
            gtk_list_store_set (film_strip_store, &film_strip_iter, 0, tmp_slide->thumbnail, -1);

            // Add the temporary slide to the slides GList
            slides = g_list_append(slides, tmp_slide);

            // Delete the screenshot file just loaded
            return_code = g_remove(tmp_string->str);
            if (-1 == return_code)
                  // * Something went wrong when deleting the screenshot *

                  // Display a warning message using our function
                  g_string_printf(tmp_string, "Error ED85: Something went wrong when deleting the screenshot file '%s'", tmp_string->str);

            // Update the status bar with a progress counter
            g_string_printf(tmp_string, " Loaded image %u of %u", tmp_int, num_screenshots);
            recent_message = gtk_statusbar_push(GTK_STATUSBAR(status_bar), statusbar_context, tmp_string->str);

            // Redraw the main window
            gtk_widget_draw(status_bar, &tmp_rect);

      // Update the project with the new height and width
      project_height = largest_height;
      project_width = largest_width;

      // If not presently set, make the first imported slide the present slide
      if (NULL == current_slide)
            current_slide = g_list_first(slides);

      // Select the correct thumbnail in the film strip and scroll to display it
      gtk_tree_view_get_cursor(GTK_TREE_VIEW(film_strip_view), &new_path, NULL);
      if (NULL != new_path)
            old_path = new_path;  // Make a backup of the old path, so we can free it
      slides = g_list_first(slides);
      slide_position = g_list_position(slides, current_slide);
      new_path = gtk_tree_path_new_from_indices(slide_position, -1);
      gtk_tree_view_set_cursor(GTK_TREE_VIEW(film_strip_view), new_path, NULL, FALSE);
      gtk_tree_view_scroll_to_cell(GTK_TREE_VIEW(film_strip_view), new_path, NULL, TRUE, 0.5, 0.0);
      if (NULL != old_path)
            gtk_tree_path_free(old_path);  // Free the old path

      // Regenerate the timeline

      // Get the presently selected zoom level
      g_string_printf(tmp_string, "%s", gtk_combo_box_get_active_text(GTK_COMBO_BOX(zoom_selector)));

      // Parse and store the zoom level
      tmp_int = g_ascii_strncasecmp(tmp_string->str, "F", 1);
      if (0 == tmp_int)
            // "Fit to width" is selected, so work out the zoom level by figuring out how much space the widget really has
            //  (Look at the alloation of it's parent widget)
            //  Reduce the width calculated by 24 pixels (guessed) to give space for widget borders and such
            zoom = (guint) (((float) (right_side->allocation.width - 24) / (float) project_width) * 100);
      } else
            tmp_string = g_string_truncate(tmp_string, tmp_string->len - 1);
            zoom = atoi(tmp_string->str);

      // Calculate and set the display size of the working area
      working_width = (project_width * zoom) / 100;
      working_height = (project_height * zoom) / 100;

      // Free the existing front store for the workspace
      if (NULL != front_store)
            front_store = NULL;

      // Draw the workspace area

      // Draw the timeline area

      // Enable the project based menu items
      menu_enable("/Project", TRUE);
      menu_enable("/Slide", TRUE);
      menu_enable("/Layer", TRUE);
      menu_enable("/Export", TRUE);

      // Enable the toolbar buttons

      // Set the changes made variable
      changes_made = TRUE;

      // Update the status bar
      g_string_printf(tmp_string, " %u screenshots imported", num_screenshots);
      recent_message = gtk_statusbar_push(GTK_STATUSBAR(status_bar), statusbar_context, tmp_string->str);

      // Free the memory allocated in this function
      g_string_free(tmp_string, TRUE);

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