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/*
 * e-import-assistant.c
 *
 * This program 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 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#include "e-import-assistant.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>

#include <glib/gi18n.h>
#include <gdk/gdkkeysyms.h>

#include "e-util/e-import.h"
#include "e-util/e-util-private.h"

#define E_IMPORT_ASSISTANT_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_IMPORT_ASSISTANT, EImportAssistantPrivate))

typedef struct _ImportFilePage ImportFilePage;
typedef struct _ImportDestinationPage ImportDestinationPage;
typedef struct _ImportTypePage ImportTypePage;
typedef struct _ImportSelectionPage ImportSelectionPage;
typedef struct _ImportProgressPage ImportProgressPage;
typedef struct _ImportSimplePage ImportSimplePage;

struct _ImportFilePage {
    GtkWidget *filename;
    GtkWidget *filetype;

    EImportTargetURI *target;
    EImportImporter *importer;
};

struct _ImportDestinationPage {
    GtkWidget *control;
};

struct _ImportTypePage {
    GtkWidget *intelligent;
    GtkWidget *file;
};

struct _ImportSelectionPage {
    GSList *importers;
    GSList *current;
    EImportTargetHome *target;
};

struct _ImportProgressPage {
    GtkWidget *progress_bar;
};

struct _ImportSimplePage {
    GtkWidget *actionlabel;
    GtkWidget *filetypetable;
    GtkWidget *filetype;
    GtkWidget *control; /* importer's destination or preview widget in an alignment */
    gboolean has_preview; /* TRUE when 'control' holds a preview widget,
                   otherwise holds destination widget */

    EImportTargetURI *target;
    EImportImporter *importer;
};

struct _EImportAssistantPrivate {
    ImportFilePage file_page;
    ImportDestinationPage destination_page;
    ImportTypePage type_page;
    ImportSelectionPage selection_page;
    ImportProgressPage progress_page;
    ImportSimplePage simple_page;

    EImport *import;

    gboolean is_simple;
    GPtrArray *fileuris; /* each element is a file URI, as a newly allocated string */

    /* Used for importing phase of operation */
    EImportTarget *import_target;
    EImportImporter *import_importer;
};

enum {
    PAGE_START,
    PAGE_INTELI_OR_DIRECT,
    PAGE_INTELI_SOURCE,
    PAGE_FILE_CHOOSE,
    PAGE_FILE_DEST,
    PAGE_FINISH,
    PAGE_PROGRESS
};

enum {
    PROP_0,
    PROP_IS_SIMPLE
};

enum {
    FINISHED,
    LAST_SIGNAL
};

static gpointer parent_class;
static guint signals[LAST_SIGNAL];

/* Importing functions */

static void
import_assistant_emit_finished (EImportAssistant *import_assistant)
{
    g_signal_emit (import_assistant, signals[FINISHED], 0);
}

static void
filename_changed (GtkWidget *widget,
                  GtkAssistant *assistant)
{
    EImportAssistantPrivate *priv;
    ImportFilePage *page;
    const gchar *filename;
    gint fileok;

    priv = E_IMPORT_ASSISTANT_GET_PRIVATE (assistant);
    page = &priv->file_page;

    filename = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (widget));

    fileok = filename && filename[0] && g_file_test (filename, G_FILE_TEST_IS_REGULAR);
    if (fileok) {
        GtkTreeIter iter;
        GtkTreeModel *model;
        gboolean valid;
        GSList *l;
        EImportImporter *first = NULL;
        gint i=0, firstitem=0;

        g_free (page->target->uri_src);
        page->target->uri_src = g_filename_to_uri (filename, NULL, NULL);

        l = e_import_get_importers (
            priv->import, (EImportTarget *) page->target);
        model = gtk_combo_box_get_model (GTK_COMBO_BOX (page->filetype));
        valid = gtk_tree_model_get_iter_first (model, &iter);
        while (valid) {
            gpointer eii = NULL;

            gtk_tree_model_get (model, &iter, 2, &eii, -1);

            if (g_slist_find (l, eii) != NULL) {
                if (first == NULL) {
                    firstitem = i;
                    first = eii;
                }
                gtk_list_store_set (GTK_LIST_STORE (model), &iter, 1, TRUE, -1);
            } else {
                if (page->importer == eii)
                    page->importer = NULL;
                gtk_list_store_set (GTK_LIST_STORE (model), &iter, 1, FALSE, -1);
            }
            i++;
            valid = gtk_tree_model_iter_next (model, &iter);
        }
        g_slist_free (l);

        if (page->importer == NULL && first) {
            page->importer = first;
            gtk_combo_box_set_active (GTK_COMBO_BOX (page->filetype), firstitem);
        }
        fileok = first != NULL;
    } else {
        GtkTreeIter iter;
        GtkTreeModel *model;
        gboolean valid;

        model = gtk_combo_box_get_model (GTK_COMBO_BOX (page->filetype));
        for (valid = gtk_tree_model_get_iter_first (model, &iter);
             valid;
             valid = gtk_tree_model_iter_next (model, &iter)) {
            gtk_list_store_set (GTK_LIST_STORE (model), &iter, 1, FALSE, -1);
        }
    }

    widget = gtk_assistant_get_nth_page (assistant, PAGE_FILE_CHOOSE);
    gtk_assistant_set_page_complete (assistant, widget, fileok);
}

static void
filetype_changed_cb (GtkComboBox *combo_box,
                     GtkAssistant *assistant)
{
    EImportAssistantPrivate *priv;
    GtkTreeModel *model;
    GtkTreeIter iter;

    priv = E_IMPORT_ASSISTANT_GET_PRIVATE (assistant);

    g_return_if_fail (gtk_combo_box_get_active_iter (combo_box, &iter));

    model = gtk_combo_box_get_model (combo_box);
    gtk_tree_model_get (model, &iter, 2, &priv->file_page.importer, -1);
    filename_changed (priv->file_page.filename, assistant);
}

static GtkWidget *
import_assistant_file_page_init (EImportAssistant *import_assistant)
{
    GtkWidget *page;
    GtkWidget *label;
    GtkWidget *container;
    GtkWidget *widget;
    GtkCellRenderer *cell;
    GtkListStore *store;
    const gchar *text;
    gint row = 0;

    page = gtk_vbox_new (FALSE, 6);
    gtk_container_set_border_width (GTK_CONTAINER (page), 12);
    gtk_widget_show (page);

    container = page;

    text = _("Choose the file that you want to import into Evolution, "
         "and select what type of file it is from the list.");

    widget = gtk_label_new (text);
    gtk_label_set_line_wrap (GTK_LABEL (widget), TRUE);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, TRUE, 0);
    gtk_widget_show (widget);

    widget = gtk_table_new (2, 2, FALSE);
    gtk_table_set_row_spacings (GTK_TABLE (widget), 2);
    gtk_table_set_col_spacings (GTK_TABLE (widget), 10);
    gtk_container_set_border_width (GTK_CONTAINER (widget), 8);
    gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
    gtk_widget_show (widget);

    container = widget;

    widget = gtk_label_new_with_mnemonic (_("F_ilename:"));
    gtk_misc_set_alignment (GTK_MISC (widget), 1, 0.5);
    gtk_table_attach (
        GTK_TABLE (container), widget,
        0, 1, row, row + 1, GTK_FILL, 0, 0, 0);
    gtk_widget_show (widget);

    label = widget;

    widget = gtk_file_chooser_button_new (
        _("Select a file"), GTK_FILE_CHOOSER_ACTION_OPEN);
    gtk_label_set_mnemonic_widget (GTK_LABEL (label), widget);
    gtk_table_attach (
        GTK_TABLE (container), widget, 1, 2,
        row, row + 1, GTK_EXPAND | GTK_FILL, 0, 0, 0);
    import_assistant->priv->file_page.filename = widget;
    gtk_widget_show (widget);

    g_signal_connect (
        widget, "selection-changed",
        G_CALLBACK (filename_changed), import_assistant);

    row++;

    widget = gtk_label_new_with_mnemonic (_("File _type:"));
    gtk_misc_set_alignment (GTK_MISC (widget), 1, 0.5);
    gtk_table_attach (
        GTK_TABLE (container), widget,
        0, 1, row, row + 1, GTK_FILL, 0, 0, 0);
    gtk_widget_show (widget);

    label = widget;

    store = gtk_list_store_new (
        3, G_TYPE_STRING, G_TYPE_BOOLEAN, G_TYPE_POINTER);
    widget = gtk_combo_box_new_with_model (GTK_TREE_MODEL (store));
    gtk_label_set_mnemonic_widget (GTK_LABEL (label), widget);
    gtk_table_attach (
        GTK_TABLE (container), widget,
        1, 2, row, row + 1, GTK_EXPAND | GTK_FILL, 0, 0, 0);
    import_assistant->priv->file_page.filetype = widget;
    gtk_widget_show (widget);
    g_object_unref (store);

    cell = gtk_cell_renderer_text_new ();
    gtk_cell_layout_pack_start (GTK_CELL_LAYOUT (widget), cell, TRUE);
    gtk_cell_layout_set_attributes (
        GTK_CELL_LAYOUT (widget), cell,
        "text", 0, "sensitive", 1, NULL);

    return page;
}

static GtkWidget *
import_assistant_destination_page_init (EImportAssistant *import_assistant)
{
    GtkWidget *page;
    GtkWidget *container;
    GtkWidget *widget;
    const gchar *text;

    page = gtk_vbox_new (FALSE, 6);
    gtk_container_set_border_width (GTK_CONTAINER (page), 12);
    gtk_widget_show (page);

    container = page;

    text = _("Choose the destination for this import");

    widget = gtk_label_new (text);
    gtk_label_set_line_wrap (GTK_LABEL (widget), TRUE);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, TRUE, 0);
    gtk_widget_show (widget);

    return page;
}

static GtkWidget *
import_assistant_type_page_init (EImportAssistant *import_assistant)
{
    GtkRadioButton *radio_button;
    GtkWidget *page;
    GtkWidget *container;
    GtkWidget *widget;
    const gchar *text;

    page = gtk_vbox_new (FALSE, 6);
    gtk_container_set_border_width (GTK_CONTAINER (page), 12);
    gtk_widget_show (page);

    container = page;

    text = _("Choose the type of importer to run:");

    widget = gtk_label_new (text);
    gtk_label_set_line_wrap (GTK_LABEL (widget), TRUE);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, TRUE, 0);
    gtk_widget_show (widget);

    widget = gtk_radio_button_new_with_mnemonic (
        NULL, _("Import data and settings from _older programs"));
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    import_assistant->priv->type_page.intelligent = widget;
    gtk_widget_show (widget);

    radio_button = GTK_RADIO_BUTTON (widget);

    widget = gtk_radio_button_new_with_mnemonic_from_widget (
        radio_button, _("Import a _single file"));
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    import_assistant->priv->type_page.file = widget;
    gtk_widget_show (widget);

    return page;
}

static GtkWidget *
import_assistant_selection_page_init (EImportAssistant *import_assistant)
{
    GtkWidget *page;
    GtkWidget *container;
    GtkWidget *widget;
    const gchar *text;

    page = gtk_vbox_new (FALSE, 6);
    gtk_container_set_border_width (GTK_CONTAINER (page), 12);
    gtk_widget_show (page);

    container = page;

    text = _("Please select the information "
         "that you would like to import:");

    widget = gtk_label_new (text);
    gtk_label_set_line_wrap (GTK_LABEL (widget), TRUE);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, TRUE, 0);
    gtk_widget_show (widget);

    widget = gtk_hseparator_new ();
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    return page;
}

static GtkWidget *
import_assistant_progress_page_init (EImportAssistant *import_assistant)
{
    GtkWidget *page;
    GtkWidget *container;
    GtkWidget *widget;

    page = gtk_vbox_new (FALSE, 6);
    gtk_container_set_border_width (GTK_CONTAINER (page), 12);
    gtk_widget_show (page);

    container = page;

    widget = gtk_progress_bar_new ();
    gtk_box_pack_start (GTK_BOX (container), widget, TRUE, FALSE, 0);
    import_assistant->priv->progress_page.progress_bar = widget;
    gtk_widget_show (widget);

    return page;
}

static GtkWidget *
import_assistant_simple_page_init (EImportAssistant *import_assistant)
{
    GtkWidget *page;
    GtkWidget *label;
    GtkWidget *container;
    GtkWidget *widget;
    GtkCellRenderer *cell;
    GtkListStore *store;
    gint row = 0;

    page = gtk_vbox_new (FALSE, 6);
    gtk_container_set_border_width (GTK_CONTAINER (page), 12);
    gtk_widget_show (page);

    container = page;

    widget = gtk_label_new ("");
    gtk_label_set_line_wrap (GTK_LABEL (widget), TRUE);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, TRUE, 0);
    gtk_widget_show (widget);
    import_assistant->priv->simple_page.actionlabel = widget;

    widget = gtk_table_new (2, 1, FALSE);
    gtk_table_set_row_spacings (GTK_TABLE (widget), 2);
    gtk_table_set_col_spacings (GTK_TABLE (widget), 10);
    gtk_container_set_border_width (GTK_CONTAINER (widget), 8);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, TRUE, 0);
    gtk_widget_show (widget);
    import_assistant->priv->simple_page.filetypetable = widget;

    container = widget;

    widget = gtk_label_new_with_mnemonic (_("File _type:"));
    gtk_misc_set_alignment (GTK_MISC (widget), 1, 0.5);
    gtk_table_attach (
        GTK_TABLE (container), widget,
        0, 1, row, row + 1, GTK_FILL, 0, 0, 0);
    gtk_widget_show (widget);

    label = widget;

    store = gtk_list_store_new (
        3, G_TYPE_STRING, G_TYPE_BOOLEAN, G_TYPE_POINTER);
    widget = gtk_combo_box_new_with_model (GTK_TREE_MODEL (store));
    gtk_label_set_mnemonic_widget (GTK_LABEL (label), widget);
    gtk_table_attach (
        GTK_TABLE (container), widget,
        1, 2, row, row + 1, GTK_EXPAND | GTK_FILL, 0, 0, 0);
    import_assistant->priv->simple_page.filetype = widget;
    gtk_widget_show (widget);
    g_object_unref (store);

    cell = gtk_cell_renderer_text_new ();
    gtk_cell_layout_pack_start (GTK_CELL_LAYOUT (widget), cell, TRUE);
    gtk_cell_layout_set_attributes (
        GTK_CELL_LAYOUT (widget), cell,
        "text", 0, "sensitive", 1, NULL);

    import_assistant->priv->simple_page.control = NULL;

    return page;
}

static void
prepare_intelligent_page (GtkAssistant *assistant,
                          GtkWidget *vbox)
{
    EImportAssistantPrivate *priv;
    GSList *l;
    GtkWidget *table;
    gint row;
    ImportSelectionPage *page;

    priv = E_IMPORT_ASSISTANT_GET_PRIVATE (assistant);
    page = &priv->selection_page;

    if (page->target != NULL) {
        gtk_assistant_set_page_complete (assistant, vbox, FALSE);
        return;
    }

    page->target = e_import_target_new_home (priv->import);

    if (page->importers)
        g_slist_free (page->importers);
    l = page->importers =
        e_import_get_importers (
            priv->import, (EImportTarget *) page->target);

    if (l == NULL) {
        GtkWidget *widget;
        const gchar *text;

        text = _("Evolution checked for settings to import from "
             "the following applications: Pine, Netscape, Elm, "
             "iCalendar. No importable settings found. If you "
             "would like to try again, please click the "
             "\"Back\" button.");

        widget = gtk_label_new (text);
        gtk_label_set_line_wrap (GTK_LABEL (widget), TRUE);
        gtk_box_pack_start (GTK_BOX (vbox), widget, FALSE, TRUE, 0);
        gtk_widget_show (widget);

        gtk_assistant_set_page_complete (assistant, vbox, FALSE);

        return;
    }

    table = gtk_table_new (g_slist_length (l), 2, FALSE);
    row = 0;
    for (;l;l=l->next) {
        EImportImporter *eii = l->data;
        gchar *str;
        GtkWidget *w, *label;

        w = e_import_get_widget (
            priv->import, (EImportTarget *) page->target, eii);

        str = g_strdup_printf (_("From %s:"), eii->name);
        label = gtk_label_new (str);
        gtk_widget_show (label);
        g_free (str);

        gtk_misc_set_alignment (GTK_MISC (label), 0, .5);

        gtk_table_attach (
            GTK_TABLE (table), label,
            0, 1, row, row+1, GTK_FILL, 0, 0, 0);
        if (w)
            gtk_table_attach (
                GTK_TABLE (table), w,
                1, 2, row, row+1, GTK_FILL, 0, 3, 0);
        row++;
    }

    gtk_widget_show (table);
    gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);

    gtk_assistant_set_page_complete (assistant, vbox, TRUE);
}

static void
import_status (EImport *import,
               const gchar *what,
               gint percent,
               gpointer user_data)
{
    EImportAssistant *import_assistant = user_data;
    GtkProgressBar *progress_bar;

    progress_bar = GTK_PROGRESS_BAR (
        import_assistant->priv->progress_page.progress_bar);
    gtk_progress_bar_set_fraction (progress_bar, percent / 100.0);
    gtk_progress_bar_set_text (progress_bar, what);
}

static void
import_done (EImport *ei,
             gpointer user_data)
{
    EImportAssistant *import_assistant = user_data;

    import_assistant_emit_finished (import_assistant);
}

static void
import_simple_done (EImport *ei, gpointer user_data)
{
    EImportAssistant *import_assistant = user_data;
    EImportAssistantPrivate *priv;

    g_return_if_fail (import_assistant != NULL);

    priv = E_IMPORT_ASSISTANT_GET_PRIVATE (import_assistant);
    g_return_if_fail (priv != NULL);
    g_return_if_fail (priv->fileuris != NULL);
    g_return_if_fail (priv->simple_page.target != NULL);

    if (import_assistant->priv->fileuris->len > 0) {
        import_status (ei, "", 0, import_assistant);

        /* process next file URI */
        g_free (priv->simple_page.target->uri_src);
        priv->simple_page.target->uri_src = g_ptr_array_remove_index (priv->fileuris, 0);

        e_import_import (
            priv->import, priv->import_target,
            priv->import_importer, import_status,
            import_simple_done, import_assistant);
    } else
        import_done (ei, import_assistant);
}

static void
import_intelligent_done (EImport *ei,
                         gpointer user_data)
{
    EImportAssistant *import_assistant = user_data;
    ImportSelectionPage *page;

    page = &import_assistant->priv->selection_page;

    if (page->current && (page->current = page->current->next)) {
        import_status (ei, "", 0, import_assistant);
        import_assistant->priv->import_importer = page->current->data;
        e_import_import (
            import_assistant->priv->import,
            (EImportTarget *) page->target,
            import_assistant->priv->import_importer,
            import_status, import_intelligent_done,
            import_assistant);
    } else
        import_done (ei, import_assistant);
}

static void
import_cancelled (EImportAssistant *assistant)
{
    e_import_cancel (
        assistant->priv->import,
        assistant->priv->import_target,
        assistant->priv->import_importer);
}

static void
prepare_file_page (GtkAssistant *assistant,
                   GtkWidget *vbox)
{
    EImportAssistantPrivate *priv;
    GSList *importers, *imp;
    GtkListStore *store;
    ImportFilePage *page;

    priv = E_IMPORT_ASSISTANT_GET_PRIVATE (assistant);
    page = &priv->file_page;

    if (page->target != NULL) {
        filename_changed (priv->file_page.filename, assistant);
        return;
    }

    page->target = e_import_target_new_uri (priv->import, NULL, NULL);
    importers = e_import_get_importers (priv->import, (EImportTarget *)page->target);

    store = GTK_LIST_STORE (gtk_combo_box_get_model (GTK_COMBO_BOX (page->filetype)));
    gtk_list_store_clear (store);

    for (imp = importers; imp; imp = imp->next) {
        GtkTreeIter iter;
        EImportImporter *eii = imp->data;

        gtk_list_store_append (store, &iter);
        gtk_list_store_set (
            store, &iter,
            0, eii->name,
            1, TRUE,
            2, eii,
            -1);
    }

    g_slist_free (importers);

    gtk_combo_box_set_active (GTK_COMBO_BOX (page->filetype), 0);

    filename_changed (priv->file_page.filename, assistant);

    g_signal_connect (
        page->filetype, "changed",
        G_CALLBACK (filetype_changed_cb), assistant);
}

static GtkWidget *
create_importer_control (EImport *import,
                         EImportTarget *target,
                         EImportImporter *importer)
{
    GtkWidget *control;

    control = e_import_get_widget (import, target, importer);
    if (control == NULL) {
        /* Coding error, not needed for translators */
        control = gtk_label_new (
            "** PLUGIN ERROR ** No settings for importer");
        gtk_widget_show (control);
    }

    return control;
}

static gboolean
prepare_destination_page (GtkAssistant *assistant,
                          GtkWidget *vbox)
{
    EImportAssistantPrivate *priv;
    ImportDestinationPage *page;

    priv = E_IMPORT_ASSISTANT_GET_PRIVATE (assistant);
    page = &priv->destination_page;

    if (page->control)
        gtk_container_remove (GTK_CONTAINER (vbox), page->control);

    page->control = create_importer_control (
        priv->import, (EImportTarget *)
        priv->file_page.target, priv->file_page.importer);

    gtk_box_pack_start (GTK_BOX (vbox), page->control, TRUE, TRUE, 0);
    gtk_assistant_set_page_complete (assistant, vbox, TRUE);

    return FALSE;
}

static void
prepare_progress_page (GtkAssistant *assistant,
                       GtkWidget *vbox)
{
    EImportAssistantPrivate *priv;
    EImportCompleteFunc done = NULL;
    ImportSelectionPage *page;
    GtkWidget *cancel_button;
    gboolean intelligent_import;
    gboolean is_simple = FALSE;

    priv = E_IMPORT_ASSISTANT_GET_PRIVATE (assistant);
    page = &priv->selection_page;

#if GTK_CHECK_VERSION(2,21,2)
    /* Because we're a GTK_ASSISTANT_PAGE_PROGRESS, this will
     * prevent the assistant window from being closed via window
     * manager decorations while importing. */
    gtk_assistant_commit (assistant);
#else
    /* Hide all GtkAssistant buttons. */
    gtk_widget_hide (assistant->back);
    gtk_widget_hide (assistant->forward);
    gtk_widget_hide (assistant->cancel);
#endif

    /* Install a custom "Cancel Import" button. */
    cancel_button = gtk_button_new_with_mnemonic (_("_Cancel Import"));
    gtk_button_set_image (
        GTK_BUTTON (cancel_button),
        gtk_image_new_from_stock (
        GTK_STOCK_CANCEL, GTK_ICON_SIZE_BUTTON));
    g_signal_connect_swapped (
        cancel_button, "clicked",
        G_CALLBACK (import_cancelled), assistant);
    gtk_assistant_add_action_widget (assistant, cancel_button);
    gtk_widget_show (cancel_button);

    g_object_get (G_OBJECT (assistant), "is-simple", &is_simple, NULL);

    intelligent_import = is_simple ? FALSE : gtk_toggle_button_get_active (
        GTK_TOGGLE_BUTTON (priv->type_page.intelligent));

    if (is_simple) {
        priv->import_importer = priv->simple_page.importer;
        priv->import_target = (EImportTarget *)priv->simple_page.target;
        done = import_simple_done;
    } else if (intelligent_import) {
        page->current = page->importers;
        if (page->current) {
            priv->import_target = (EImportTarget *) page->target;
            priv->import_importer = page->current->data;
            done = import_intelligent_done;
        }
    } else {
        if (priv->file_page.importer) {
            priv->import_importer = priv->file_page.importer;
            priv->import_target = (EImportTarget *)priv->file_page.target;
            done = import_done;
        }
    }

    if (done)
        e_import_import (
            priv->import, priv->import_target,
            priv->import_importer, import_status,
            done, assistant);
    else
        import_assistant_emit_finished (E_IMPORT_ASSISTANT (assistant));
}

static void
simple_filetype_changed_cb (GtkComboBox *combo_box, GtkAssistant *assistant)
{
    EImportAssistantPrivate *priv;
    ImportSimplePage *page;
    GtkTreeModel *model;
    GtkTreeIter iter;
    GtkWidget *vbox;
    GtkWidget *control;

    priv = E_IMPORT_ASSISTANT_GET_PRIVATE (assistant);
    page = &priv->simple_page;

    g_return_if_fail (gtk_combo_box_get_active_iter (combo_box, &iter));

    model = gtk_combo_box_get_model (combo_box);
    gtk_tree_model_get (model, &iter, 2, &page->importer, -1);

    vbox = g_object_get_data (G_OBJECT (combo_box), "page-vbox");
    g_return_if_fail (vbox != NULL);

    if (page->control)
        gtk_widget_destroy (page->control);
    page->has_preview = FALSE;

    control = e_import_get_preview_widget (
        priv->import, (EImportTarget *)
        page->target, page->importer);
    if (control) {
        page->has_preview = TRUE;
        gtk_widget_set_size_request (control, 320, 240);
    } else
        control = create_importer_control (
            priv->import, (EImportTarget *)
            page->target, page->importer);

    page->control = gtk_alignment_new (0.0, 0.0, 1.0, 1.0);
    gtk_widget_show (page->control);
    gtk_container_add (GTK_CONTAINER (page->control), control);

    gtk_box_pack_start (GTK_BOX (vbox), page->control, TRUE, TRUE, 0);
    gtk_assistant_set_page_complete (assistant, vbox, TRUE);
}

static void
prepare_simple_page (GtkAssistant *assistant, GtkWidget *vbox)
{
    EImportAssistantPrivate *priv;
    GSList *importers, *imp;
    GtkListStore *store;
    ImportSimplePage *page;
    gchar *uri;

    priv = E_IMPORT_ASSISTANT_GET_PRIVATE (assistant);
    page = &priv->simple_page;

    g_return_if_fail (priv->fileuris != NULL);

    if (page->target != NULL) {
        return;
    }

    uri = g_ptr_array_remove_index (priv->fileuris, 0);
    page->target = e_import_target_new_uri (priv->import, uri, NULL);
    g_free (uri);
    importers = e_import_get_importers (priv->import, (EImportTarget *)page->target);

    store = GTK_LIST_STORE (gtk_combo_box_get_model (GTK_COMBO_BOX (page->filetype)));
    gtk_list_store_clear (store);

    for (imp = importers; imp; imp = imp->next) {
        GtkTreeIter iter;
        EImportImporter *eii = imp->data;

        gtk_list_store_append (store, &iter);
        gtk_list_store_set (
            store, &iter,
            0, eii->name,
            1, TRUE,
            2, eii,
            -1);
    }

    gtk_combo_box_set_active (GTK_COMBO_BOX (page->filetype), 0);
    g_object_set_data (G_OBJECT (page->filetype), "page-vbox", vbox);

    simple_filetype_changed_cb (GTK_COMBO_BOX (page->filetype), assistant);

    g_signal_connect (
        page->filetype, "changed",
        G_CALLBACK (simple_filetype_changed_cb), assistant);

    if (gtk_tree_model_iter_n_children (GTK_TREE_MODEL (store), NULL) == 1) {
        gchar *title;

        /* only one importer found, make it even simpler */
        gtk_label_set_text (GTK_LABEL (page->actionlabel),
            page->has_preview ?
                _("Preview data to be imported") :
                _("Choose the destination for this import"));

        gtk_widget_hide (page->filetypetable);

        title = g_strconcat (
            _("Import Data"), " - ",
            ((EImportImporter *)importers->data)->name, NULL);
        gtk_assistant_set_page_title (assistant, vbox, title);
        g_free (title);
    } else {
        /* multiple importers found, be able to choose from them */
        gtk_label_set_text (
            GTK_LABEL (page->actionlabel),
            _("Select what type of file you "
              "want to import from the list."));

        gtk_widget_show (page->filetypetable);

        gtk_assistant_set_page_title (assistant, vbox, _("Import Data"));
    }

    g_slist_free (importers);
}

static gboolean
prepare_simple_destination_page (GtkAssistant *assistant,
                          GtkWidget *vbox)
{
    EImportAssistantPrivate *priv;
    ImportDestinationPage *page;
    ImportSimplePage *simple_page;

    priv = E_IMPORT_ASSISTANT_GET_PRIVATE (assistant);
    page = &priv->destination_page;
    simple_page = &priv->simple_page;

    if (page->control)
        gtk_container_remove (GTK_CONTAINER (vbox), page->control);

    page->control = create_importer_control (
        priv->import, (EImportTarget *)
        simple_page->target, simple_page->importer);

    gtk_box_pack_start (GTK_BOX (vbox), page->control, TRUE, TRUE, 0);
    gtk_assistant_set_page_complete (assistant, vbox, TRUE);

    return FALSE;
}

static gint
forward_cb (gint current_page,
            EImportAssistant *import_assistant)
{
    GtkToggleButton *toggle_button;
    gboolean is_simple = FALSE;

    g_object_get (G_OBJECT (import_assistant), "is-simple", &is_simple, NULL);

    if (is_simple) {
        if (!import_assistant->priv->simple_page.has_preview)
            current_page++;

        return current_page + 1;
    }

    toggle_button = GTK_TOGGLE_BUTTON (
        import_assistant->priv->type_page.intelligent);

    switch (current_page) {
        case PAGE_INTELI_OR_DIRECT:
            if (gtk_toggle_button_get_active (toggle_button))
                return PAGE_INTELI_SOURCE;
            else
                return PAGE_FILE_CHOOSE;
        case PAGE_INTELI_SOURCE:
            return PAGE_FINISH;
    }

    return current_page + 1;
}

static gboolean
set_import_uris (EImportAssistant *assistant, gchar **uris)
{
    EImportAssistantPrivate *priv;
    GPtrArray *fileuris = NULL;
    gint i;

    g_return_val_if_fail (assistant != NULL, FALSE);
    g_return_val_if_fail (assistant->priv != NULL, FALSE);
    g_return_val_if_fail (assistant->priv->import != NULL, FALSE);
    g_return_val_if_fail (uris != NULL, FALSE);

    priv = E_IMPORT_ASSISTANT_GET_PRIVATE (assistant);

    for (i = 0; uris[i]; i++) {
        gchar *uri = uris[i];
        gchar *filename;

        filename = g_filename_from_uri (uri, NULL, NULL);
        if (!filename)
            filename = uri;

        if (filename && *filename && g_file_test (filename, G_FILE_TEST_IS_REGULAR)) {
            gchar *furi;

            if (!g_path_is_absolute (filename)) {
                gchar *tmp, *curr;

                curr = g_get_current_dir ();
                tmp = g_build_filename (curr, filename, NULL);
                g_free (curr);

                if (filename != uri)
                    g_free (filename);

                filename = tmp;
            }

            if (fileuris == NULL) {
                EImportTargetURI *target;
                GSList *importers;

                furi = g_filename_to_uri (filename, NULL, NULL);
                target = e_import_target_new_uri (priv->import, furi, NULL);
                importers = e_import_get_importers (priv->import, (EImportTarget *) target);

                if (importers != NULL) {
                    /* there is at least one importer which can be used,
                       thus there can be done an import */
                    fileuris = g_ptr_array_new ();
                }

                g_slist_free (importers);
                e_import_target_free (priv->import, target);
                g_free (furi);

                if (fileuris == NULL) {
                    if (filename != uri)
                        g_free (filename);
                    break;
                }
            }

            furi = g_filename_to_uri (filename, NULL, NULL);
            if (furi)
                g_ptr_array_add (fileuris, furi);
        }

        if (filename != uri)
            g_free (filename);
    }

    if (fileuris != NULL) {
        priv->fileuris = fileuris;
    }

    return fileuris != NULL;
}

static void
import_assistant_dispose (GObject *object)
{
    EImportAssistantPrivate *priv;

    priv = E_IMPORT_ASSISTANT_GET_PRIVATE (object);

    if (priv->file_page.target != NULL) {
        e_import_target_free (
            priv->import, (EImportTarget *)
            priv->file_page.target);
        priv->file_page.target = NULL;
    }

    if (priv->selection_page.target != NULL) {
        e_import_target_free (
            priv->import, (EImportTarget *)
            priv->selection_page.target);
        priv->selection_page.target = NULL;
    }

    if (priv->simple_page.target != NULL) {
        e_import_target_free (
            priv->import, (EImportTarget *)
            priv->simple_page.target);
        priv->simple_page.target = NULL;
    }

    if (priv->import != NULL) {
        g_object_unref (priv->import);
        priv->import = NULL;
    }

    if (priv->fileuris != NULL) {
        g_ptr_array_foreach (priv->fileuris, (GFunc) g_free, NULL);
        g_ptr_array_free (priv->fileuris, TRUE);
        priv->fileuris = NULL;
    }

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (parent_class)->dispose (object);
}

static void
import_assistant_finalize (GObject *object)
{
    EImportAssistantPrivate *priv;

    priv = E_IMPORT_ASSISTANT_GET_PRIVATE (object);

    g_slist_free (priv->selection_page.importers);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
import_assistant_set_property (GObject *object,
                               guint property_id,
                               const GValue *value,
                               GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_IS_SIMPLE:
            E_IMPORT_ASSISTANT_GET_PRIVATE (object)->is_simple = g_value_get_boolean (value);
        return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
import_assistant_get_property (GObject *object,
                               guint property_id,
                               GValue *value,
                               GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_IS_SIMPLE:
            g_value_set_boolean (value,
                E_IMPORT_ASSISTANT_GET_PRIVATE (object)->is_simple);
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static gboolean
import_assistant_key_press_event (GtkWidget *widget,
                                  GdkEventKey *event)
{
    GtkWidgetClass *widget_class;

    if (event->keyval == GDK_Escape) {
        g_signal_emit_by_name (widget, "cancel");
        return TRUE;
    }

    /* Chain up to parent's key_press_event () method. */
    widget_class = GTK_WIDGET_CLASS (parent_class);
    return widget_class->key_press_event (widget, event);
}

static void
import_assistant_prepare (GtkAssistant *assistant,
                          GtkWidget *page)
{
    gint page_no = gtk_assistant_get_current_page (assistant);
    gboolean is_simple = FALSE;

    g_object_get (G_OBJECT (assistant), "is-simple", &is_simple, NULL);

    if (is_simple) {
        if (page_no == 0) {
            prepare_simple_page (assistant, page);
        } else if (page_no == 1) {
            prepare_simple_destination_page (assistant, page);
        } else if (page_no == 2) {
            prepare_progress_page (assistant, page);
        }

        return;
    }

    switch (page_no) {
        case PAGE_INTELI_SOURCE:
            prepare_intelligent_page (assistant, page);
            break;
        case PAGE_FILE_CHOOSE:
            prepare_file_page (assistant, page);
            break;
        case PAGE_FILE_DEST:
            prepare_destination_page (assistant, page);
            break;
        case PAGE_PROGRESS:
            prepare_progress_page (assistant, page);
            break;
        default:
            break;
    }
}

static void
import_assistant_class_init (EImportAssistantClass *class)
{
    GObjectClass *object_class;
    GtkWidgetClass *widget_class;
    GtkAssistantClass *assistant_class;

    parent_class = g_type_class_peek_parent (class);
    g_type_class_add_private (class, sizeof (EImportAssistantPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->dispose = import_assistant_dispose;
    object_class->finalize = import_assistant_finalize;
    object_class->set_property = import_assistant_set_property;
    object_class->get_property = import_assistant_get_property;

    widget_class = GTK_WIDGET_CLASS (class);
    widget_class->key_press_event = import_assistant_key_press_event;

    assistant_class = GTK_ASSISTANT_CLASS (class);
    assistant_class->prepare = import_assistant_prepare;

    g_object_class_install_property (
        object_class,
        PROP_IS_SIMPLE,
        g_param_spec_boolean (
            "is-simple",
            NULL,
            NULL,
            FALSE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));

    signals[FINISHED] = g_signal_new (
        "finished",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST,
        0, NULL, NULL,
        g_cclosure_marshal_VOID__VOID,
        G_TYPE_NONE, 0);
}

static void
import_assistant_construct (EImportAssistant *import_assistant)
{
    GtkAssistant *assistant;
    GtkWidget *page;

    assistant = GTK_ASSISTANT (import_assistant);

    import_assistant->priv =
        E_IMPORT_ASSISTANT_GET_PRIVATE (import_assistant);

    import_assistant->priv->import =
        e_import_new ("org.gnome.evolution.shell.importer");

    gtk_window_set_position (GTK_WINDOW (assistant), GTK_WIN_POS_CENTER);
    gtk_window_set_title (GTK_WINDOW (assistant), _("Evolution Import Assistant"));
    gtk_window_set_default_size (GTK_WINDOW (assistant), 500, 330);

    if (import_assistant->priv->is_simple) {
        /* simple import assistant page, URIs of files will be known later */
        page = import_assistant_simple_page_init (import_assistant);

        gtk_assistant_append_page (assistant, page);
        gtk_assistant_set_page_title (assistant, page, _("Import Data"));
        gtk_assistant_set_page_type (assistant, page, GTK_ASSISTANT_PAGE_CONTENT);

        /* File destination page - when with preview*/
        page = import_assistant_destination_page_init (import_assistant);

        gtk_assistant_append_page (assistant, page);
        gtk_assistant_set_page_title (assistant, page, _("Import Location"));
        gtk_assistant_set_page_type (assistant, page, GTK_ASSISTANT_PAGE_CONTENT);
    } else {
        /* complex import assistant pages */

        /* Start page */
        page = gtk_label_new ("");
        gtk_label_set_line_wrap (GTK_LABEL (page), TRUE);
        gtk_misc_set_alignment (GTK_MISC (page), 0.0, 0.5);
        gtk_misc_set_padding (GTK_MISC (page), 12, 12);
        gtk_label_set_text (GTK_LABEL (page), _(
            "Welcome to the Evolution Import Assistant.\n"
            "With this assistant you will be guided through the "
            "process of importing external files into Evolution."));
        gtk_widget_show (page);

        gtk_assistant_append_page (assistant, page);
        gtk_assistant_set_page_title (assistant, page, _("Evolution Import Assistant"));
        gtk_assistant_set_page_type (assistant, page, GTK_ASSISTANT_PAGE_INTRO);
        gtk_assistant_set_page_complete (assistant, page, TRUE);

        /* Intelligent or direct import page */
        page = import_assistant_type_page_init (import_assistant);

        gtk_assistant_append_page (assistant, page);
        gtk_assistant_set_page_title (assistant, page, _("Importer Type"));
        gtk_assistant_set_page_type (assistant, page, GTK_ASSISTANT_PAGE_CONTENT);
        gtk_assistant_set_page_complete (assistant, page, TRUE);

        /* Intelligent importer source page */
        page = import_assistant_selection_page_init (import_assistant);

        gtk_assistant_append_page (assistant, page);
        gtk_assistant_set_page_title (assistant, page, _("Select Information to Import"));
        gtk_assistant_set_page_type (assistant, page, GTK_ASSISTANT_PAGE_CONTENT);

        /* File selection and file type page */
        page = import_assistant_file_page_init (import_assistant);

        gtk_assistant_append_page (assistant, page);
        gtk_assistant_set_page_title (assistant, page, _("Select a File"));
        gtk_assistant_set_page_type (assistant, page, GTK_ASSISTANT_PAGE_CONTENT);

        /* File destination page */
        page = import_assistant_destination_page_init (import_assistant);

        gtk_assistant_append_page (assistant, page);
        gtk_assistant_set_page_title (assistant, page, _("Import Location"));
        gtk_assistant_set_page_type (assistant, page, GTK_ASSISTANT_PAGE_CONTENT);

        /* Finish page */
        page = gtk_label_new ("");
        gtk_misc_set_alignment (GTK_MISC (page), 0.5, 0.5);
        gtk_label_set_text (
            GTK_LABEL (page), _("Click \"Apply\" to "
            "begin importing the file into Evolution."));
        gtk_widget_show (page);

        gtk_assistant_append_page (assistant, page);
        gtk_assistant_set_page_title (assistant, page, _("Import Data"));
        gtk_assistant_set_page_type (assistant, page, GTK_ASSISTANT_PAGE_CONFIRM);
        gtk_assistant_set_page_complete (assistant, page, TRUE);
    }

    /* Progress Page */
    page = import_assistant_progress_page_init (import_assistant);

    gtk_assistant_append_page (assistant, page);
    gtk_assistant_set_page_title (assistant, page, _("Import Data"));
    gtk_assistant_set_page_type (assistant, page, GTK_ASSISTANT_PAGE_PROGRESS);
    gtk_assistant_set_page_complete (assistant, page, TRUE);

    gtk_assistant_set_forward_page_func (
        assistant, (GtkAssistantPageFunc)
        forward_cb, import_assistant, NULL);

    gtk_assistant_update_buttons_state (assistant);
}

static void
import_assistant_init (EImportAssistant *import_assistant)
{
    /* do nothing here */
}

GType
e_import_assistant_get_type (void)
{
    static GType type = 0;

    if (G_UNLIKELY (type == 0)) {
        static const GTypeInfo type_info = {
            sizeof (EImportAssistantClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) import_assistant_class_init,
            (GClassFinalizeFunc) NULL,
            NULL,  /* class_data */
            sizeof (EImportAssistant),
            0,     /* n_preallocs */
            (GInstanceInitFunc) import_assistant_init,
            NULL   /* value_table */
        };

        type = g_type_register_static (
            GTK_TYPE_ASSISTANT, "EImportAssistant", &type_info, 0);
    }

    return type;
}

GtkWidget *
e_import_assistant_new (GtkWindow *parent)
{
    GtkWidget *assistant;

    assistant = g_object_new (
            E_TYPE_IMPORT_ASSISTANT,
            "transient-for", parent, NULL);

    import_assistant_construct (E_IMPORT_ASSISTANT (assistant));

    return assistant;
}

/* Creates a simple assistant with only page to choose an import type
 * and where to import, and then finishes. It shows import types based
 * on the first valid URI given.
 *
 * Returns: EImportAssistant widget.
 */
GtkWidget *
e_import_assistant_new_simple (GtkWindow *parent,
                               gchar **uris,
                               gboolean preview)
{
    GtkWidget *assistant;

    assistant = g_object_new (
        E_TYPE_IMPORT_ASSISTANT,
        "transient-for", parent,
        "is-simple", TRUE,
        NULL);

    import_assistant_construct (E_IMPORT_ASSISTANT (assistant));

    if (!set_import_uris (E_IMPORT_ASSISTANT (assistant), uris)) {
        g_object_ref_sink (assistant);
        g_object_unref (assistant);
        return NULL;
    }

    /* FIXME Implement the 'preview' mode, probably
     *       by adding a new function to an importer */

    return assistant;
}