/* Copyright 2009-2010 Yorba Foundation
 *
 * This software is licensed under the GNU LGPL (version 2.1 or later).
 * See the COPYING file in this distribution. 
 */

namespace ExportUI {
private static File current_export_dir = null;

public File? choose_file(string current_file_basename) {
    if (current_export_dir == null)
        current_export_dir = File.new_for_path(Environment.get_home_dir());
        
    Gtk.FileChooserDialog chooser = new Gtk.FileChooserDialog(_("Export Photo"),
        AppWindow.get_instance(), Gtk.FileChooserAction.SAVE, Gtk.STOCK_CANCEL, 
        Gtk.ResponseType.CANCEL, Gtk.STOCK_SAVE, Gtk.ResponseType.ACCEPT, null);
    chooser.set_do_overwrite_confirmation(true);
    chooser.set_current_folder(current_export_dir.get_path());
    chooser.set_current_name(current_file_basename);

    File file = null;
    if (chooser.run() == Gtk.ResponseType.ACCEPT) {
        file = File.new_for_path(chooser.get_filename());
        current_export_dir = file.get_parent();
    }
    
    chooser.destroy();
    
    return file;
}

public File? choose_dir() {
    if (current_export_dir == null)
        current_export_dir = File.new_for_path(Environment.get_home_dir());

    Gtk.FileChooserDialog chooser = new Gtk.FileChooserDialog(_("Export Photos"),
        AppWindow.get_instance(), Gtk.FileChooserAction.SELECT_FOLDER, Gtk.STOCK_CANCEL, 
        Gtk.ResponseType.CANCEL, Gtk.STOCK_OK, Gtk.ResponseType.ACCEPT, null);
    chooser.set_current_folder(current_export_dir.get_path());
    
    File dir = null;
    if (chooser.run() == Gtk.ResponseType.ACCEPT) {
        dir = File.new_for_path(chooser.get_filename());
        current_export_dir = dir;
    }
    
    chooser.destroy();
    
    return dir;
}
}

public Gtk.ResponseType export_error_dialog(File dest, bool photos_remaining) {
    string message = _("Unable to export the following photo due to a file error.\n\n") +
        dest.get_path();

    Gtk.ResponseType response = Gtk.ResponseType.NONE;

    if (photos_remaining) {
        message += _("\n\nWould you like to continue exporting?");
        response = AppWindow.affirm_cancel_question(message, _("Con_tinue"));
    } else {
        AppWindow.error_message(message);
    }

    return response;
}


public class ExportDialog : Gtk.Dialog {
    public const int DEFAULT_SCALE = 1200;
    public const ScaleConstraint DEFAULT_CONSTRAINT = ScaleConstraint.DIMENSIONS;
    public const Jpeg.Quality DEFAULT_QUALITY = Jpeg.Quality.HIGH;
    public const PhotoFileFormat DEFAULT_FORMAT = PhotoFileFormat.JFIF;
    
    public const ScaleConstraint[] CONSTRAINT_ARRAY = { ScaleConstraint.ORIGINAL,
        ScaleConstraint.DIMENSIONS, ScaleConstraint.WIDTH, ScaleConstraint.HEIGHT };
    
    public const Jpeg.Quality[] QUALITY_ARRAY = { Jpeg.Quality.LOW, Jpeg.Quality.MEDIUM, 
        Jpeg.Quality.HIGH, Jpeg.Quality.MAXIMUM };

    private static ScaleConstraint current_constraint = ScaleConstraint.DIMENSIONS;
    private static Jpeg.Quality current_quality = Jpeg.Quality.HIGH;
    private static int current_scale = DEFAULT_SCALE;
    
    private Gtk.Table table = new Gtk.Table(0, 0, false);
    private Gtk.ComboBox quality_combo;
    private Gtk.ComboBox constraint_combo;
    private Gtk.ComboBox format_combo;
    private Gtk.Entry pixels_entry;
    private Gtk.Widget ok_button;
    private bool in_insert = false;
    
    public ExportDialog(string title) {
        this.title = title;
        has_separator = false;
        allow_grow = false;

        quality_combo = new Gtk.ComboBox.text();
        int ctr = 0;
        foreach (Jpeg.Quality quality in QUALITY_ARRAY) {
            quality_combo.append_text(quality.to_string());
            if (quality == current_quality)
                quality_combo.set_active(ctr);
            ctr++;
        }
        
        constraint_combo = new Gtk.ComboBox.text();
        ctr = 0;
        foreach (ScaleConstraint constraint in CONSTRAINT_ARRAY) {
            constraint_combo.append_text(constraint.to_string());
            if (constraint == current_constraint)
                constraint_combo.set_active(ctr);
            ctr++;
        }

        format_combo = new Gtk.ComboBox.text();
        foreach (PhotoFileFormat format in PhotoFileFormat.get_writable()) {
            format_combo.append_text(format.get_properties().get_user_visible_name());
        }

        pixels_entry = new Gtk.Entry();
        pixels_entry.set_max_length(6);
        pixels_entry.set_size_request(60, -1);
        pixels_entry.set_text("%d".printf(current_scale));
        
        // register after preparation to avoid signals during init
        constraint_combo.changed.connect(on_constraint_changed);
        format_combo.changed.connect(on_format_changed);
        pixels_entry.changed.connect(on_pixels_changed);
        pixels_entry.insert_text.connect(on_pixels_insert_text);
        pixels_entry.activate.connect(on_activate);

        // layout controls
        add_label(_("_Format:"), 0, 0, format_combo);
        add_control(format_combo, 1, 0);

        add_label(_("_Quality:"), 0, 1, quality_combo);
        add_control(quality_combo, 1, 1);
        
        add_label(_("_Scaling constraint:"), 0, 2, constraint_combo);
        add_control(constraint_combo, 1, 2);

        Gtk.Label pixels_label = new Gtk.Label.with_mnemonic(_(" _pixels"));
        pixels_label.set_mnemonic_widget(pixels_entry);
        
        Gtk.HBox pixels_box = new Gtk.HBox(false, 0);
        pixels_box.pack_start(pixels_entry, false, false, 0);
        pixels_box.pack_end(pixels_label, false, false, 0);
        add_control(pixels_box, 1, 3);
        
        ((Gtk.VBox) get_content_area()).add(table);
        
        // add buttons to action area
        add_button(Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL);
        ok_button = add_button(Gtk.STOCK_OK, Gtk.ResponseType.OK);

        ok_button.set_flags(ok_button.get_flags() | Gtk.WidgetFlags.CAN_DEFAULT | Gtk.WidgetFlags.HAS_DEFAULT);
        set_default(ok_button);

        if (current_constraint == ScaleConstraint.ORIGINAL) {
            pixels_entry.sensitive = false;
            quality_combo.sensitive = false;
        }

        ok_button.grab_focus();
    }
    // unlike other parameters, which should be persisted across dialog executions, format
    // must be set each time the dialog is executed, so that the format displayed in the
    // format combo box matches the format of the backing photo -- this is why it's passed
    // qualified as ref and not as out
    public bool execute(out int scale, out ScaleConstraint constraint, out Jpeg.Quality quality,
        ref PhotoFileFormat user_format) {
        show_all();
        
        if (!user_format.can_write())
            user_format = PhotoFileFormat.get_system_default_format();
        
        int ctr = 0;
        foreach (PhotoFileFormat format in PhotoFileFormat.get_writable()) {
            if (format == user_format)
                format_combo.set_active(ctr);
            ctr++;
        }
        on_format_changed();
        
        bool ok = (run() == Gtk.ResponseType.OK);
        if (ok) {
            int index = constraint_combo.get_active();
            assert(index >= 0);
            constraint = CONSTRAINT_ARRAY[index];
            current_constraint = constraint;
            
            scale = pixels_entry.get_text().to_int();
            if (constraint != ScaleConstraint.ORIGINAL)
                assert(scale > 0);
            current_scale = scale;
            
            index = quality_combo.get_active();
            assert(index >= 0);
            quality = QUALITY_ARRAY[index];
            current_quality = quality;
            
            index = format_combo.get_active();
            assert(index >= 0);
            user_format = PhotoFileFormat.get_writable()[index];
        }
        
        destroy();
        
        return ok;
    }
    
    private void add_label(string text, int x, int y, Gtk.Widget? widget = null) {
        Gtk.Alignment left_aligned = new Gtk.Alignment(0.0f, 0.5f, 0, 0);
        
        Gtk.Label new_label = new Gtk.Label.with_mnemonic(text);
        new_label.set_use_underline(true);
        
        if (widget != null)
            new_label.set_mnemonic_widget(widget);
        
        left_aligned.add(new_label);
        
        table.attach(left_aligned, x, x + 1, y, y + 1, Gtk.AttachOptions.FILL, Gtk.AttachOptions.FILL, 
            10, 5);
    }
    
    private void add_control(Gtk.Widget widget, int x, int y) {
        Gtk.Alignment left_aligned = new Gtk.Alignment(0, 0.5f, 0, 0);
        left_aligned.add(widget);
        
        table.attach(left_aligned, x, x + 1, y, y + 1, Gtk.AttachOptions.FILL, Gtk.AttachOptions.FILL,
            10, 5);
    }
    
    private void on_constraint_changed() {
        bool original = CONSTRAINT_ARRAY[constraint_combo.get_active()] == ScaleConstraint.ORIGINAL;
        bool jpeg = format_combo.get_active_text() ==
            PhotoFileFormat.JFIF.get_properties().get_user_visible_name();
        pixels_entry.sensitive = !original;
        quality_combo.sensitive = !original && jpeg;
        if (original)
            ok_button.sensitive = true;
        else
            on_pixels_changed();
    }

    private void on_format_changed() {
        bool original = CONSTRAINT_ARRAY[constraint_combo.get_active()] == ScaleConstraint.ORIGINAL;
        bool jpeg = format_combo.get_active_text() ==
            PhotoFileFormat.JFIF.get_properties().get_user_visible_name();
        quality_combo.sensitive = !original && jpeg;
    }
    
    private void on_activate() {
        response(Gtk.ResponseType.OK);
    }
    
    private void on_pixels_changed() {
        ok_button.sensitive = (pixels_entry.get_text_length() > 0) && (pixels_entry.get_text().to_int() > 0);
    }
    
    private void on_pixels_insert_text(string text, int length, void *position) {
        // This is necessary because SignalHandler.block_by_func() is not properly bound
        if (in_insert)
            return;
        
        in_insert = true;
        
        if (length == -1)
            length = (int) text.length;
        
        // only permit numeric text
        string new_text = "";
        for (int ctr = 0; ctr < length; ctr++) {
            if (text[ctr].isdigit()) {
                new_text += ((char) text[ctr]).to_string();
            }
        }
        
        if (new_text.length > 0)
            pixels_entry.insert_text(new_text, (int) new_text.length, position);
        
        Signal.stop_emission_by_name(pixels_entry, "insert-text");
        
        in_insert = false;
    }
}

namespace ImportUI {
private const int REPORT_FAILURE_COUNT = 4;

private string? generate_import_failure_list(Gee.List<BatchImportResult> failed) {
    if (failed.size == 0)
        return null;
    
    string list = "";
    for (int ctr = 0; ctr < REPORT_FAILURE_COUNT && ctr < failed.size; ctr++)
        list += "%s\n".printf(failed.get(ctr).identifier);
    
    int remaining = failed.size - REPORT_FAILURE_COUNT;
    if (remaining > 0)
        list += _("(and %d more)\n").printf(remaining);
    
    return list;
}

public class QuestionParams {
    public string question;
    public string yes_button;
    public string no_button;
    
    public QuestionParams(string question, string yes_button, string no_button) {
        this.question = question;
        this.yes_button = yes_button;
        this.no_button = no_button;
    }
}

// Returns true if the user selected the yes action, false otherwise.
public bool report_manifest(ImportManifest manifest, bool list, QuestionParams? question = null) {
    string message = "";
    
    if (manifest.already_imported.size > 0) {
        string already_imported_message =
            (ngettext("1 duplicate photo was not imported:\n",
            "%d duplicate photos were not imported:\n",
            manifest.already_imported.size)).printf(manifest.already_imported.size);

        message += already_imported_message;
        
        if (list)
            message += generate_import_failure_list(manifest.already_imported);
    }
    
    if (manifest.failed.size > 0) {
        if (list && message.length > 0)
            message += "\n";
        
        string failed_message =
            (ngettext("1 photo failed to import due to a file or hardware error:\n",
                "%d photos failed to import due to a file or hardware error:\n",
                manifest.failed.size)).printf(manifest.failed.size);

        message += failed_message;
        
        if (list)
            message += generate_import_failure_list(manifest.failed);
    }
    
    if (manifest.camera_failed.size > 0) {
        if (list && message.length > 0)
            message += "\n";
        
        string camera_failed_message =
            ngettext("1 photo failed to import due to a camera error:\n",
                "%d photos failed to import due to a camera error:\n",
                manifest.camera_failed.size).printf(manifest.camera_failed.size);
            
        message += camera_failed_message;
        
        if (list)
            message += generate_import_failure_list(manifest.camera_failed);
    }
    
    if (manifest.skipped_photos.size > 0) {
        if (list && message.length > 0)
            message += "\n";
        
        string skipped_photos_message = (ngettext("1 unsupported photo skipped:\n",
            "%d unsupported photos skipped:\n", manifest.skipped_photos.size)).printf(
            manifest.skipped_photos.size);

        message += skipped_photos_message;
        
        if (list)
            message += generate_import_failure_list(manifest.skipped_photos);
    }

    if (manifest.skipped_files.size > 0) {
        if (list && message.length > 0)
            message += "\n";
        
        string skipped_files_message = (ngettext("1 non-image file skipped.\n",
            "%d non-image files skipped.\n", manifest.skipped_files.size)).printf(
            manifest.skipped_files.size);

        message += skipped_files_message;
    }
    
    if (manifest.aborted.size > 0) {
        if (list && message.length > 0)
            message += "\n";
        
        string aborted_message = (ngettext("1 photo skipped due to user cancel:\n",
            "%d photos skipped due to user cancel:\n", manifest.aborted.size)).printf(
            manifest.aborted.size);

        message += aborted_message;
        
        if (list)
            message += generate_import_failure_list(manifest.aborted);
    }
    
    if (manifest.success.size > 0) {
        if (list && message.length > 0)
            message += "\n";
        
        string success_message = (ngettext("1 photo successfully imported.\n",
            "%d photos successfully imported.\n", manifest.success.size)).printf(
            manifest.success.size);
        message += success_message;
    }
    
    int total = manifest.success.size + manifest.failed.size + manifest.camera_failed.size
        + manifest.skipped_photos.size + manifest.skipped_files.size
        + manifest.already_imported.size + manifest.aborted.size;
    assert(total == manifest.all.size);
    
    // if no photos imported at all (i.e. an empty directory attempted), need to at least report
    // that nothing was imported
    if (total == 0)
        message += _("No photos imported.\n");
    
    Gtk.MessageDialog dialog = null;
    if (question == null) {
        dialog = new Gtk.MessageDialog(AppWindow.get_instance(), Gtk.DialogFlags.MODAL,
            Gtk.MessageType.INFO, Gtk.ButtonsType.OK, "%s", message);
    } else {
        message += ("\n" + question.question);
    
        dialog = new Gtk.MessageDialog(AppWindow.get_instance(), Gtk.DialogFlags.MODAL,
            Gtk.MessageType.QUESTION, Gtk.ButtonsType.NONE, "%s", message);
        dialog.add_button(question.no_button, Gtk.ResponseType.NO);
        dialog.add_button(question.yes_button, Gtk.ResponseType.YES);
    }
    
    dialog.title = _("Import Complete");
    
    bool yes = (dialog.run() == Gtk.ResponseType.YES);
    
    dialog.destroy();
    
    return yes;
}
}

public abstract class TextEntryDialogMediator {
    private TextEntryDialog dialog;

    public TextEntryDialogMediator(string title, string label, string? initial_text = null) {
        Gtk.Builder builder = AppWindow.create_builder();
        dialog = builder.get_object("text_entry_dialog1") as TextEntryDialog;
        dialog.set_builder(builder);
        dialog.setup(on_modify_validate, title, label, initial_text);
    }
    
    protected virtual bool on_modify_validate(string text) {
        return true;
    }

    protected string? _execute() {
        return dialog.execute();
    }
}

public class TextEntryDialog : Gtk.Dialog {
    public delegate bool OnModifyValidateType(string text);

    private OnModifyValidateType on_modify_validate;
    private Gtk.Entry entry;
    private Gtk.Builder builder;
    
    public void set_builder(Gtk.Builder builder) {
        this.builder = builder;
    }

    public void setup(OnModifyValidateType? modify_validate, string title, string label, 
        string? initial_text) {
        set_title(title);
        set_parent_window(AppWindow.get_instance().get_parent_window());
        set_transient_for(AppWindow.get_instance());
        on_modify_validate = modify_validate;

        Gtk.Label name_label = builder.get_object("label") as Gtk.Label;
        name_label.set_text(label);

        entry = builder.get_object("entry") as Gtk.Entry;
        entry.set_text(initial_text != null ? initial_text : "");
        entry.grab_focus();

        set_default_response(Gtk.ResponseType.OK);
    }

    public string? execute() {
        string? text = null;
        
        // validate entry to start with
        set_response_sensitive(Gtk.ResponseType.OK, on_modify_validate(entry.get_text()));
        
        show_all();
        
        if (run() == Gtk.ResponseType.OK)
            text = entry.get_text();
        
        destroy();
        
        return text;
    }
    
    public void on_entry_changed() {
        set_response_sensitive(Gtk.ResponseType.OK, on_modify_validate(entry.get_text()));
    }
}

public class EventRenameDialog : TextEntryDialogMediator {
    public EventRenameDialog(string? event_name) {
        base (_("Rename Event"), _("Name:"), event_name);
    }

    public virtual string? execute() {
        return _execute();
    }
}

public class EditTitleDialog : TextEntryDialogMediator {
    public EditTitleDialog(string? photo_title) {
        base (_("Edit Title"), _("Title:"), photo_title);
    }

    public virtual string? execute() {
        string? ex = _execute();
        return ex == null ? null : ex.strip();
    }
}

// Returns: Gtk.ResponseType.YES (trash photos), Gtk.ResponseType.NO (only remove photos) and
// Gtk.ResponseType.CANCEL.
public Gtk.ResponseType remove_from_library_dialog(Gtk.Window owner, string title, int count) {
    string msg = ngettext(
        "This will remove the photo from your Shotwell library.  Would you also like to move the file to your desktop trash?\n\nThis action cannot be undone.",
        "This will remove %d photos from your Shotwell library.  Would you also like to move the files to your desktop trash?\n\nThis action cannot be undone.",
        count).printf(count);
    string trash_action = ngettext("_Trash File", "_Trash Files", count);
    
    Gtk.MessageDialog dialog = new Gtk.MessageDialog(owner, Gtk.DialogFlags.MODAL,
        Gtk.MessageType.WARNING, Gtk.ButtonsType.CANCEL, "%s", msg);
    dialog.add_button(_("Only _Remove"), Gtk.ResponseType.NO);
    dialog.add_button(trash_action, Gtk.ResponseType.YES);
    dialog.title = title;
    
    Gtk.ResponseType result = (Gtk.ResponseType) dialog.run();
    
    dialog.destroy();
    
    return result;
}

public bool revert_editable_dialog(Gtk.Window owner, Gee.Collection<Photo> photos) {
    int count = 0;
    foreach (Photo photo in photos) {
        if (photo.has_editable())
            count++;
    }
    
    if (count == 0)
        return false;
        
    string msg = ngettext(
        "This will destroy all changes made to the external file.  Continue?",
        "This will destroy all changes made to %d external files.  Continue?",
        count).printf(count);
    string action = ngettext("Re_vert External Edit", "Re_vert External Edits", count);
    
    Gtk.MessageDialog dialog = new Gtk.MessageDialog(owner, Gtk.DialogFlags.MODAL,
        Gtk.MessageType.WARNING, Gtk.ButtonsType.NONE, "%s", msg);
    dialog.add_button(_("_Cancel"), Gtk.ResponseType.CANCEL);
    dialog.add_button(action, Gtk.ResponseType.YES);
    dialog.title = ngettext("Revert External Edit", "Revert External Edits", count);
    
    Gtk.ResponseType result = (Gtk.ResponseType) dialog.run();
    
    dialog.destroy();
    
    return result == Gtk.ResponseType.YES;
}

public bool remove_offline_dialog(Gtk.Window owner, int count) {
    if (count == 0)
        return false;
    
    string msg = ngettext(
        "This will remove the photo from the library.  Continue?",
        "This will remove %d photos from the library.  Continue?",
        count).printf(count);
    
    Gtk.MessageDialog dialog = new Gtk.MessageDialog(owner, Gtk.DialogFlags.MODAL,
        Gtk.MessageType.WARNING, Gtk.ButtonsType.NONE, "%s", msg);
    dialog.add_button(_("_Cancel"), Gtk.ResponseType.CANCEL);
    dialog.add_button(_("_Remove"), Gtk.ResponseType.OK);
    dialog.title = ngettext("Remove Photo From Library", "Remove Photos From Library", count);
    
    Gtk.ResponseType result = (Gtk.ResponseType) dialog.run();
    
    dialog.destroy();
    
    return result == Gtk.ResponseType.OK;
}

public class ProgressDialog : Gtk.Window {
    private Gtk.ProgressBar progress_bar = new Gtk.ProgressBar();
    private Gtk.Button cancel_button = null;
    private Cancellable cancellable;
    private uint64 last_count = uint64.MAX;
    private int update_every = 1;
    
    public ProgressDialog(Gtk.Window? owner, string text, Cancellable? cancellable = null) {
        this.cancellable = cancellable;
        
        set_title(text);
        set_resizable(false);
        if (owner != null)
            set_transient_for(owner);
        set_modal(true);
        set_type_hint(Gdk.WindowTypeHint.DIALOG);
        
        progress_bar.set_size_request(300, -1);
        
        Gtk.VBox vbox_bar = new Gtk.VBox(false, 0);
        vbox_bar.pack_start(progress_bar, true, false, 0);
        
        if (cancellable != null) {
            cancel_button = new Gtk.Button.from_stock(Gtk.STOCK_CANCEL);
            cancel_button.clicked.connect(on_cancel);
            delete_event.connect(on_window_closed);
        }
        
        Gtk.HBox hbox = new Gtk.HBox(false, 8);
        hbox.pack_start(vbox_bar, true, false, 0);
        if (cancel_button != null)
            hbox.pack_end(cancel_button, false, false, 0);
        
        
        Gtk.Label primary_text_label = new Gtk.Label("");
        primary_text_label.set_markup("<span weight=\"bold\">%s</span>".printf(text));
        primary_text_label.set_alignment(0, 0.5f);

        Gtk.VBox vbox = new Gtk.VBox(false, 12);
        vbox.pack_start(primary_text_label, false, false, 0);
        vbox.pack_start(hbox, true, false, 0);

        Gtk.Alignment alignment = new Gtk.Alignment(0.5f, 0.5f, 1.0f, 1.0f);
        alignment.set_padding(12, 12, 12, 12);
        alignment.add(vbox);
        
        add(alignment);
        
        show_all();
        
        if (cancellable == null)
            window.set_functions(Gdk.WMFunction.MOVE);
    }
    
    public void update_display_every(int update_every) {
        assert(update_every >= 1);
        
        this.update_every = update_every;
    }
    
    public void set_fraction(int current, int total) {
        set_percentage((double) current / (double) total);
    }
    
    public void set_percentage(double pct) {
        pct = pct.clamp(0.0, 1.0);
        
        progress_bar.set_fraction(pct);
        progress_bar.set_text(_("%d%%").printf((int) (pct * 100.0)));
    }
    
    // This can be used as a ProgressMonitor delegate.
    public bool monitor(uint64 count, uint64 total) {
        if (last_count == uint64.MAX)
            last_count = count;
        
        if ((count - last_count) > update_every) {
            set_percentage((double) count / (double) total);
            
            // TODO: get rid of this.  non-trivial, as some progress-monitor operations are blocking
            // and need to allow the event loop to spin
            spin_event_loop();
            
            last_count = count;
        }
        
        return (cancellable != null) ? !cancellable.is_cancelled() : true;
    }
    
    public void close() {
        hide();
        destroy();
    }
    
    private bool on_window_closed() {
        on_cancel();
        return false; // return false so that the system handler will remove the window from
                      // the screen
    }
    
    private void on_cancel() {
        if (cancellable != null)
            cancellable.cancel();
        
        cancel_button.sensitive = false;
    }
}

public class AdjustDateTimeDialog : Gtk.Dialog {
    private const int64 SECONDS_IN_DAY = 60 * 60 * 24;
    private const int64 SECONDS_IN_HOUR = 60 * 60;
    private const int64 SECONDS_IN_MINUTE = 60;
    private const int YEAR_OFFSET = 1900;
    private bool no_original_time = false;

    time_t original_time;
    Gtk.Label original_time_label;
    Gtk.Calendar calendar;
    Gtk.SpinButton hour;
    Gtk.SpinButton minute;
    Gtk.SpinButton second;
    Gtk.ComboBox system;
    Gtk.RadioButton relativity_radio_button;
    Gtk.RadioButton batch_radio_button;
    Gtk.CheckButton modify_originals_check_button;
    Gtk.Label notification;

    private enum TimeSystem {
        AM,
        PM,
        24HR;
    }    

    TimeSystem previous_time_system;

    public AdjustDateTimeDialog(PhotoSource source, int photo_count, bool display_options = true) {
        assert(source != null);

        set_modal(true);
        set_resizable(false);
        has_separator = false;
        set_transient_for(AppWindow.get_instance());

        add_buttons(Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL, 
                    Gtk.STOCK_OK, Gtk.ResponseType.OK);
        set_title(Resources.ADJUST_DATE_TIME_LABEL);

        calendar = new Gtk.Calendar();
        calendar.day_selected.connect(on_time_changed);
        calendar.month_changed.connect(on_time_changed);
        calendar.next_year.connect(on_time_changed);
        calendar.prev_year.connect(on_time_changed);

        if (Config.get_instance().get_24_hr_time())
            hour = new Gtk.SpinButton.with_range(0, 23, 1);
        else
            hour = new Gtk.SpinButton.with_range(1, 12, 1);

        hour.output.connect(on_spin_button_output);
        hour.set_width_chars(2);  

        minute = new Gtk.SpinButton.with_range(0, 59, 1);
        minute.set_width_chars(2);
        minute.output.connect(on_spin_button_output);

        second = new Gtk.SpinButton.with_range(0, 59, 1);
        second.set_width_chars(2);
        second.output.connect(on_spin_button_output);

        system = new Gtk.ComboBox.text();
        system.append_text(_("AM"));
        system.append_text(_("PM"));
        system.append_text(_("24 Hr"));
        system.changed.connect(on_time_system_changed);

        Gtk.HBox clock = new Gtk.HBox(false, 0);

        clock.pack_start(hour, false, false, 3);
        clock.pack_start(new Gtk.Label(":"), false, false, 3); // internationalize?
        clock.pack_start(minute, false, false, 3);
        clock.pack_start(new Gtk.Label(":"), false, false, 3);
        clock.pack_start(second, false, false, 3);
        clock.pack_start(system, false, false, 3);

        set_default_response(Gtk.ResponseType.OK);
        
        relativity_radio_button = new Gtk.RadioButton.with_mnemonic(null, 
            _("_Shift photos by the same amount"));
        relativity_radio_button.set_active(Config.get_instance().get_keep_relativity());
        relativity_radio_button.sensitive = display_options && photo_count > 1;

        batch_radio_button = new Gtk.RadioButton.with_mnemonic(relativity_radio_button.get_group(),
            _("Set _all photos to this time"));
        batch_radio_button.set_active(!Config.get_instance().get_keep_relativity());
        batch_radio_button.sensitive = display_options && photo_count > 1;
        batch_radio_button.toggled.connect(on_time_changed);

        modify_originals_check_button = new Gtk.CheckButton.with_mnemonic(ngettext(
            "_Modify original file", "_Modify original files", photo_count));
        modify_originals_check_button.set_active(Config.get_instance().get_modify_originals() &&
            display_options);
        modify_originals_check_button.sensitive = display_options;

        Gtk.VBox time_content = new Gtk.VBox(false, 0);

        time_content.pack_start(calendar, true, false, 3);
        time_content.pack_start(clock, true, false, 3);

        if (display_options) {
            time_content.pack_start(relativity_radio_button, true, false, 3);
            time_content.pack_start(batch_radio_button, true, false, 3);
            time_content.pack_start(modify_originals_check_button, true, false, 3);
        }

        Gdk.Pixbuf preview = null;
        try {
            preview = source.get_pixbuf(Scaling.for_viewport(Dimensions(500, 
                display_options ? 280 : 200), false));
        } catch (Error err) {
            warning("Unable to fetch preview for %s", source.to_string());
        }
        
        Gtk.VBox image_content = new Gtk.VBox(false, 0);
        Gtk.Image image = (preview != null) ? new Gtk.Image.from_pixbuf(preview) : new Gtk.Image();
        original_time_label = new Gtk.Label(null);
        image_content.pack_start(image, true, false, 3);
        image_content.pack_start(original_time_label, true, false, 3);

        Gtk.HBox hbox = new Gtk.HBox(false, 0);
        hbox.pack_start(image_content, true, false, 6);
        hbox.pack_start(time_content, true, false, 6);

        Gtk.Alignment hbox_alignment = new Gtk.Alignment(0.5f, 0.5f, 0, 0);
        hbox_alignment.set_padding(6, 3, 6, 6);
        hbox_alignment.add(hbox);

        vbox.pack_start(hbox_alignment, true, false, 6);

        notification = new Gtk.Label("");
        notification.set_line_wrap(true);
        notification.set_justify(Gtk.Justification.CENTER);
        notification.set_size_request(-1, -1);
        notification.set_padding(12, 6);

        vbox.pack_start(notification, true, true, 0);
        
        original_time = source.get_exposure_time();

        if (original_time == 0) {
            original_time = time_t();
            no_original_time = true;
        }

        set_time(Time.local(original_time));
        set_original_time_label(Config.get_instance().get_24_hr_time());
    }

    private void set_time(Time time) {
        calendar.select_month(time.month, time.year + YEAR_OFFSET);
        calendar.select_day(time.day);

        if (Config.get_instance().get_24_hr_time()) {
            hour.set_value(time.hour);
            system.set_active(TimeSystem.24HR);
        } else {
            int AMPM_hour = time.hour % 12;
            hour.set_value((AMPM_hour == 0) ? 12 : AMPM_hour);
            system.set_active((time.hour >= 12) ? TimeSystem.PM : TimeSystem.AM);
        }

        minute.set_value(time.minute);
        second.set_value(time.second);

        previous_time_system = (TimeSystem) system.get_active();
    }

    private void set_original_time_label(bool use_24_hr_format) {
        if (no_original_time)
            return;

        original_time_label.set_text(_("Original: ") + 
            Time.local(original_time).format(use_24_hr_format ? _("%m/%d/%Y, %H:%M:%S") :
            _("%m/%d/%Y, %I:%M:%S %p")));
    }

    private time_t get_time() {
        Time time = Time();

        time.second = (int) second.get_value();
        time.minute = (int) minute.get_value();

        // convert to 24 hr
        int hour = (int) hour.get_value();
        time.hour = (hour == 12 && system.get_active() != TimeSystem.24HR) ? 0 : hour;
        time.hour += ((system.get_active() == TimeSystem.PM) ? 12 : 0);

        uint year, month, day;
        calendar.get_date(out year, out month, out day);
        time.year = ((int) year) - YEAR_OFFSET;
        time.month = (int) month;
        time.day = (int) day;

        time.isdst = -1;

        return time.mktime();
    }

    public bool execute(out int64 time_shift, out bool keep_relativity, 
        out bool modify_originals) {
        show_all();

        bool response = false;

        if (run() == Gtk.ResponseType.OK) {
            if (no_original_time)
                time_shift = (int64) get_time();
            else
                time_shift = (int64) (get_time() - original_time);

            keep_relativity = relativity_radio_button.get_active();

            if (relativity_radio_button.sensitive)
                Config.get_instance().set_keep_relativity(keep_relativity);

            modify_originals = modify_originals_check_button.get_active();

            if (modify_originals_check_button.sensitive)
                Config.get_instance().set_modify_originals(modify_originals);

            response = true;
        }

        destroy();

        return response;
    }

    private bool on_spin_button_output(Gtk.SpinButton button) {
        button.set_text("%02d".printf((int) button.get_value()));

        on_time_changed();

        return true;
    }

    private void on_time_changed() {
        int64 time_shift = (int64) (get_time() - original_time);

        previous_time_system = (TimeSystem) system.get_active();

        if (time_shift == 0 || no_original_time || (batch_radio_button.get_active() &&
            batch_radio_button.sensitive)) {
            notification.hide();
        } else {
            bool forward = time_shift > 0;
            int days, hours, minutes, seconds;

            time_shift = time_shift.abs();

            days = (int) (time_shift / SECONDS_IN_DAY);
            time_shift = time_shift % SECONDS_IN_DAY;
            hours = (int) (time_shift / SECONDS_IN_HOUR);
            time_shift = time_shift % SECONDS_IN_HOUR;
            minutes = (int) (time_shift / SECONDS_IN_MINUTE);
            seconds = (int) (time_shift % SECONDS_IN_MINUTE);

            string shift_status = (forward) ?
                _("Exposure time will be shifted forward by\n%d %s, %d %s, %d %s, and %d %s.") :
                _("Exposure time will be shifted backward by\n%d %s, %d %s, %d %s, and %d %s.");

            notification.set_text(shift_status.printf(days, ngettext("day", "days", days),
                hours, ngettext("hour", "hours", hours), minutes, 
                ngettext("minute", "minutes", minutes), seconds, 
                ngettext("second", "seconds", seconds)));

            notification.show();
        }
    }

    private void on_time_system_changed() {
        if (previous_time_system == system.get_active())
            return;

        Config.get_instance().set_24_hr_time(system.get_active() == TimeSystem.24HR);

        if (system.get_active() == TimeSystem.24HR) {
            int time = (hour.get_value() == 12.0) ? 0 : (int) hour.get_value();
            time = time + ((previous_time_system == TimeSystem.PM) ? 12 : 0);

            hour.set_range(0, 23);
            set_original_time_label(true);

            hour.set_value(time);
        } else {
            int AMPM_hour = ((int) hour.get_value()) % 12;

            hour.set_range(1, 12);
            set_original_time_label(false);

            hour.set_value((AMPM_hour == 0) ? 12 : AMPM_hour);
        }

        on_time_changed();
    }
}

public const int MAX_OBJECTS_DISPLAYED = 3;
public void multiple_object_error_dialog(Gee.ArrayList<DataObject> objects, string message, 
    string title) {
    string dialog_message = message + "\n";

    //add objects
    for(int i = 0; i < MAX_OBJECTS_DISPLAYED && objects.size > i; i++)
        dialog_message += "\n" + objects.get(i).to_string();

    int remainder = objects.size - MAX_OBJECTS_DISPLAYED;
    if (remainder > 0) {
        dialog_message += ngettext("\n\nAnd %d other.", "\n\nAnd %d others.",
            remainder).printf(remainder);
    }

    Gtk.MessageDialog dialog = new Gtk.MessageDialog(AppWindow.get_instance(),
        Gtk.DialogFlags.MODAL, Gtk.MessageType.ERROR, Gtk.ButtonsType.OK, "%s", dialog_message);
    
    dialog.title = title;
    
    dialog.run();
    dialog.destroy();
}



public class AddTagsDialog : TextEntryDialogMediator {
    public AddTagsDialog() {
        base (Resources.ADD_TAGS_TITLE, _("Tags (separated by commas):"));
    }

    public string[]? execute() {
        string? text = _execute();
        if (text == null)
            return null;
        
        // only want to return null if the user chose cancel, however, on_modify_validate ensures
        // that Tag.prep_tag_names won't return a zero-length array (and it never returns null)
        return Tag.prep_tag_names(text.split(","));
    }

    protected override bool on_modify_validate(string text) {
        // Can't simply call Tag.prep_tag_names().length because of this bug:
        // https://bugzilla.gnome.org/show_bug.cgi?id=602208
        string[] names = Tag.prep_tag_names(text.split(","));
        
        return names.length > 0;
    }
}

public class ModifyTagsDialog : TextEntryDialogMediator {
    public ModifyTagsDialog(LibraryPhoto photo) {
        base (Resources.MODIFY_TAGS_LABEL, _("Tags (separated by commas):"), 
            get_initial_text(photo));
    }
    
    private static string? get_initial_text(LibraryPhoto photo) {
        Gee.SortedSet<Tag>? sorted_tags = Tag.global.fetch_sorted_for_photo(photo);
        
        if (sorted_tags == null)
            return null;
        
        string[] tag_names = new string[0];
		foreach (Tag tag in sorted_tags)
            tag_names += tag.get_name();
        
        string? text = null;
        foreach (string tag in tag_names) {
            if (text == null)
                text = "";
            else
                text += ", ";
            
            text += tag;
        }
        
        return text;
    }
    
    public Gee.ArrayList<Tag>? execute() {
        string? text = _execute();
        if (text == null)
            return null;
        
        Gee.ArrayList<Tag> new_tags = new Gee.ArrayList<Tag>();
        
        // return empty list if no tags specified
        if (is_string_empty(text))
            return new_tags;
        
        // break up by comma-delimiter, prep for use, and separate into list
        string[] tag_names = Tag.prep_tag_names(text.split(","));

        foreach (string name in tag_names)
            new_tags.add(Tag.for_name(name));
        
        return new_tags;
    }
}

public class WelcomeDialog : Gtk.Dialog {
    Gtk.CheckButton hide_button;
    Gtk.CheckButton? fspot_import_check = null;
    Gtk.CheckButton? system_pictures_import_check = null;

    public WelcomeDialog(Gtk.Window owner) {
        bool show_fspot_import = is_fspot_import_possible();
        bool show_system_pictures_import = is_system_pictures_import_possible();
        Gtk.Widget ok_button = add_button(Gtk.STOCK_OK, Gtk.ResponseType.OK);
        set_title(_("Welcome!"));
        set_resizable(false);
        has_separator = false;
        set_type_hint(Gdk.WindowTypeHint.DIALOG);
        set_transient_for(owner);

        Gtk.Label primary_text = new Gtk.Label("");
        primary_text.set_markup(
            "<span size=\"large\" weight=\"bold\">%s</span>".printf(_("Welcome to Shotwell!")));
        primary_text.set_alignment(0, 0.5f);
        Gtk.Label secondary_text = new Gtk.Label("");
        if (!(show_fspot_import || show_system_pictures_import)) {
            secondary_text.set_markup("<span weight=\"normal\">%s</span>".printf(
                _("To get started, import photos in any of these ways:")));
        }
        secondary_text.set_alignment(0, 0.5f);
        Gtk.Image image = new Gtk.Image.from_pixbuf(Resources.get_icon(Resources.ICON_APP, 50));
        
        Gtk.Widget? header_text = null;
        if (show_fspot_import || show_system_pictures_import) {
            header_text = primary_text;
        } else {
            header_text = new Gtk.VBox(false, 0);
            
            ((Gtk.VBox) header_text).pack_start(primary_text, false, false, 5);
            ((Gtk.VBox) header_text).pack_start(secondary_text, false, false, 0);
        }

        Gtk.HBox header_content = new Gtk.HBox(false, 12);
        header_content.pack_start(image, false, false, 0);
        header_content.pack_start(header_text, false, false, 0);

        Gtk.Label instructions = new Gtk.Label("");
        string indent_prefix = (show_fspot_import || show_system_pictures_import) ? "   " : "";
        instructions.set_markup(((indent_prefix + "&#8226; %s\n") + (indent_prefix + "&#8226; %s\n")
            + (indent_prefix + "&#8226; %s")).printf(
            _("Choose <span weight=\"bold\">File %s Import From Folder</span>").printf("▸"),
            _("Drag and drop photos onto the Shotwell window"),
            _("Connect a camera to your computer and import")));
        instructions.set_alignment(0, 0.5f);
        
        Gtk.VBox? import_action_checkbox_packer = null;
        if (show_fspot_import || show_system_pictures_import) {
            import_action_checkbox_packer = new Gtk.VBox(false, 2);
            
            if (show_fspot_import) {
                fspot_import_check = new Gtk.CheckButton.with_mnemonic(
                    _("Import photos from your _F-Spot library"));
                import_action_checkbox_packer.add(fspot_import_check);
                fspot_import_check.set_active(true);
            }
            
            if (show_system_pictures_import) {
                system_pictures_import_check = new Gtk.CheckButton.with_mnemonic(
                    _("_Import photos from your %s folder").printf(
                    get_display_pathname(AppDirs.get_import_dir())));
                import_action_checkbox_packer.add(system_pictures_import_check);
                system_pictures_import_check.set_active(true);
            }
        }
        
        Gtk.Label? instruction_header = null;
        if (show_fspot_import || show_system_pictures_import) {
            instruction_header = new Gtk.Label(
                _("You can also import photos in any of these ways:"));
            instruction_header.set_alignment(0.0f, 0.5f);
        }
        
        Gtk.VBox content = new Gtk.VBox(false, 16);
        content.pack_start(header_content, true, true, 0);
        if (show_fspot_import || show_system_pictures_import) {
            content.add(import_action_checkbox_packer);
            content.add(instruction_header);
        }
        content.pack_start(instructions, false, false, 0);

        hide_button = new Gtk.CheckButton.with_mnemonic(_("_Don't show this message again"));
        hide_button.set_active(true);
        content.pack_start(hide_button, false, false, 6);
        
        Gtk.Alignment alignment = new Gtk.Alignment(0, 0, 0, 0);
        alignment.set_padding(12, 0, 12, 12);
        alignment.add(content);

        vbox.pack_start(alignment, false, false, 0);

        ok_button.grab_focus();
    }

    public bool execute(out bool do_fspot_import = false, out bool do_system_pictures_import = false) {
        show_all();

        bool ok = (run() == Gtk.ResponseType.OK);
        bool show_dialog = true;

        if (ok)
            show_dialog = !hide_button.get_active();
        
        if (fspot_import_check != null)
            do_fspot_import = fspot_import_check.get_active();
        if (system_pictures_import_check != null)
            do_system_pictures_import = system_pictures_import_check.get_active();

        destroy();

        return show_dialog;
    }
    
    private static bool is_system_pictures_import_possible() {
        File system_pictures = AppDirs.get_import_dir();
        if (!system_pictures.query_exists(null))
            return false;
        
        if (!(system_pictures.query_file_type(FileQueryInfoFlags.NONE, null) == FileType.DIRECTORY))
            return false;

        try {
            FileEnumerator syspics_child_enum = system_pictures.enumerate_children("standard::*",
                FileQueryInfoFlags.NONE, null);
            return (syspics_child_enum.next_file(null) != null);
        } catch (Error e) {
            return false;
        }
    }
    
    private static bool is_fspot_import_possible() {
        return false;
    }
}

public class PreferencesDialog {
    private static PreferencesDialog preferences_dialog;
    private Gtk.Dialog dialog;
    private Gtk.Builder builder;
    private Gtk.Adjustment bg_color_adjustment;
    private Gtk.HScale bg_color_slider;
    private Gtk.Entry library_dir_entry;
    private Gtk.ComboBox photo_editor_combo;
#if !NO_RAW
    private Gtk.ComboBox raw_editor_combo;
    private SortedList<AppInfo> external_raw_apps;
#endif
    private SortedList<AppInfo> external_photo_apps;
    
    private PreferencesDialog() {
        builder = AppWindow.create_builder();
        
        dialog = builder.get_object("preferences_dialog") as Gtk.Dialog;
        dialog.set_parent_window(AppWindow.get_instance().get_parent_window());
        dialog.set_transient_for(AppWindow.get_instance());
        dialog.delete_event.connect(on_delete);
        dialog.response.connect(on_close);
        
        bg_color_adjustment = builder.get_object("bg_color_adjustment") as Gtk.Adjustment;
        bg_color_adjustment.set_value(bg_color_adjustment.get_upper() - 
            Config.get_instance().get_bg_color().red);
        bg_color_adjustment.value_changed.connect(on_value_changed);
        
        bg_color_slider = builder.get_object("bg_color_slider") as Gtk.HScale;
        bg_color_slider.button_press_event.connect(on_bg_color_reset);

    	library_dir_entry = 
            builder.get_object("library_dir_entry") as Gtk.Entry;
        
        library_dir_entry.set_text(AppDirs.get_import_dir().get_path());
        library_dir_entry.focus_out_event.connect(on_import_dir_entry_changed);
        
        Gtk.Button library_dir_browser = 
            builder.get_object("file_browser_button") as Gtk.Button;
        library_dir_browser.clicked.connect(on_browse_import_dir);
        
        photo_editor_combo = builder.get_object("external_photo_editor_combo") as Gtk.ComboBox;
#if !NO_RAW
        raw_editor_combo = builder.get_object("external_raw_editor_combo") as Gtk.ComboBox;
#endif
        
        populate_preference_options();
        
        photo_editor_combo.changed.connect(on_photo_editor_changed);
#if !NO_RAW
        raw_editor_combo.changed.connect(on_raw_editor_changed);
#endif
    }
    
    public void populate_preference_options() {
        populate_app_combo_box(photo_editor_combo, PhotoFileFormat.get_editable_mime_types(), 
            Config.get_instance().get_external_photo_app(), out external_photo_apps);

#if !NO_RAW        
        populate_app_combo_box(raw_editor_combo, PhotoFileFormat.RAW.get_mime_types(), 
            Config.get_instance().get_external_raw_app(), out external_raw_apps);
#endif
    }
    
    private void populate_app_combo_box(Gtk.ComboBox combo_box, string[] mime_types,
        string current_app_executable, out SortedList<AppInfo> external_apps) {
        // get list of all applications for the given mime types
        assert(mime_types.length != 0);
        external_apps = get_apps_for_mime_types(mime_types);
        
        if (external_apps.size == 0)
            return;
        
        // populate application ComboBox with app names and icons
        Gtk.CellRendererPixbuf pixbuf_renderer = new Gtk.CellRendererPixbuf();
        Gtk.CellRendererText text_renderer = new Gtk.CellRendererText();
        combo_box.clear();
        combo_box.pack_start(pixbuf_renderer, false);
        combo_box.pack_start(text_renderer, false);
        combo_box.add_attribute(pixbuf_renderer, "pixbuf", 0);
        combo_box.add_attribute(text_renderer, "text", 1);
        
        // TODO: need more space between icons and text
        Gtk.ListStore combo_store = new Gtk.ListStore(2, typeof(Gdk.Pixbuf), typeof(string));
        Gtk.TreeIter iter;
        
        int current_app = -1;
        
        foreach (AppInfo app in external_apps) {
            combo_store.append(out iter);

            Icon app_icon = app.get_icon();
            try {
                if (app_icon is FileIcon) {
                    combo_store.set_value(iter, 0, scale_pixbuf(new Gdk.Pixbuf.from_file(
                        ((FileIcon) app_icon).get_file().get_path()), Resources.DEFAULT_ICON_SCALE,
                        Gdk.InterpType.BILINEAR, false));
                } else if (app_icon is ThemedIcon) {
                    unowned Gdk.Pixbuf icon_pixbuf = 
                        Gtk.IconTheme.get_default().load_icon(((ThemedIcon) app_icon).get_names()[0],
                        Resources.DEFAULT_ICON_SCALE, Gtk.IconLookupFlags.FORCE_SIZE);
                    
                    combo_store.set_value(iter, 0, icon_pixbuf);
                }
            } catch (GLib.Error error) {
                warning("Error loading icon pixbuf: " + error.message);
            }

            combo_store.set_value(iter, 1, app.get_name());
            
            if (app.get_commandline() == current_app_executable)
                current_app = external_apps.index_of(app);
        }
        
        // TODO: allow users to choose unlisted applications like Nautilus's "Open with -> Other Application..."

        combo_box.set_model(combo_store);

        if (current_app != -1)
            combo_box.set_active(current_app);
    }
    
    public static void show() {
        if (preferences_dialog == null) 
            preferences_dialog = new PreferencesDialog();
        
        preferences_dialog.populate_preference_options();
        preferences_dialog.dialog.show_all();	
	}
    
    private bool on_delete() {
        Config.get_instance().commit_bg_color();        
        return dialog.hide_on_delete(); //prevent widgets from getting destroyed
    }
    
    private void on_close() {
        dialog.hide();
        Config.get_instance().commit_bg_color();
    }
    
    private void on_value_changed() {
        set_background_color(bg_color_adjustment.get_upper() - bg_color_adjustment.get_value());
    }

    private bool on_bg_color_reset(Gdk.EventButton event) {
        if (event.button == 1 && event.type == Gdk.EventType.BUTTON_PRESS
            && has_only_key_modifier(event.state, Gdk.ModifierType.CONTROL_MASK)) {
            // Left Mouse Button and CTRL pressed
            bg_color_slider.set_value(bg_color_adjustment.get_upper() - parse_color(Config.DEFAULT_BG_COLOR).red);

            return true;
        }

        return false;
    }

    private void set_background_color(double bg_color_value) {
        Config.get_instance().set_bg_color(to_grayscale((uint16) bg_color_value));
    }

    private Gdk.Color to_grayscale(uint16 color_value) {
        Gdk.Color color = Gdk.Color();
        
        color.red = color_value;
        color.green = color_value;
        color.blue = color_value;
        
        return color;
    }
    
    private void on_browse_import_dir() {
        Gtk.FileChooserDialog file_chooser = new Gtk.FileChooserDialog(
            _("Choose Library Directory"), AppWindow.get_instance(),
            Gtk.FileChooserAction.SELECT_FOLDER, Gtk.STOCK_CANCEL,
            Gtk.ResponseType.CANCEL, Gtk.STOCK_OPEN,
            Gtk.ResponseType.ACCEPT);
        
        try {
            file_chooser.set_file(AppDirs.get_import_dir());
        } catch (GLib.Error error) {
        }
        
        if (file_chooser.run() == Gtk.ResponseType.ACCEPT) {
            File library_dir = file_chooser.get_file();
            
            library_dir_entry.set_text(library_dir.get_path());
            on_import_dir_entry_changed(Gdk.EventFocus());
        }
        
        file_chooser.destroy();
    }
    
    private bool on_import_dir_entry_changed(Gdk.EventFocus event) {
        AppDirs.set_import_dir(library_dir_entry.get_text());
        
        return false;
    }
    
    private void on_photo_editor_changed() {
        AppInfo app = external_photo_apps.get_at(photo_editor_combo.get_active());

        Config.get_instance().set_external_photo_app(get_app_open_command(app));

        debug("setting external photo editor to: %s", get_app_open_command(app));

    }
    
#if !NO_RAW
    private void on_raw_editor_changed() {
        AppInfo app = external_raw_apps.get_at(raw_editor_combo.get_active());
        
        Config.get_instance().set_external_raw_app(app.get_commandline());
        
        debug("setting external raw editor to: %s", app.get_commandline());
    }
#endif
}

// This function is used to determine whether or not files should be copied or linked when imported.
// Returns ACCEPT for copy, REJECT for link, and CANCEL for (drum-roll) cancel.
public Gtk.ResponseType copy_files_dialog() {
    string msg = _("Shotwell can copy the photos into your library or it can link to the photos without duplicating them.");

    Gtk.MessageDialog dialog = new Gtk.MessageDialog(AppWindow.get_instance(), Gtk.DialogFlags.MODAL,
        Gtk.MessageType.QUESTION, Gtk.ButtonsType.CANCEL, "%s", msg);

    dialog.add_button(_("Co_py into Library"), Gtk.ResponseType.ACCEPT);
    dialog.add_button(_("Create _Links"), Gtk.ResponseType.REJECT);
    dialog.title = _("Import to Library");

    Gtk.ResponseType result = (Gtk.ResponseType) dialog.run();
    
    dialog.destroy();

    return result;
}
