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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-addressbook-selector.c
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "e-addressbook-selector.h"

#include <e-util/e-selection.h>
#include <libedataserverui/e-client-utils.h>

#include <eab-book-util.h>
#include <eab-contact-merging.h>

typedef struct _MergeContext MergeContext;

struct _EAddressbookSelectorPrivate {
    EAddressbookView *current_view;
};

struct _MergeContext {
    EBookClient *source_client;
    EBookClient *target_client;

    EContact *current_contact;
    GSList *remaining_contacts;
    guint pending_removals;
    gboolean pending_adds;

    gint remove_from_source : 1;
    gint copy_done          : 1;
};

enum {
    PROP_0,
    PROP_CURRENT_VIEW
};

static GtkTargetEntry drag_types[] = {
    { (gchar *) "text/x-source-vcard", 0, 0 }
};

static gpointer parent_class;

static void
merge_context_next (MergeContext *merge_context)
{
    GSList *list;

    merge_context->current_contact = NULL;
    if (!merge_context->remaining_contacts)
        return;

    list = merge_context->remaining_contacts;
    merge_context->current_contact = list->data;
    list = g_slist_delete_link (list, list);
    merge_context->remaining_contacts = list;
}

static MergeContext *
merge_context_new (EBookClient *source_client,
                   EBookClient *target_client,
                   GSList *contact_list)
{
    MergeContext *merge_context;

    merge_context = g_slice_new0 (MergeContext);
    merge_context->source_client = source_client;
    merge_context->target_client = target_client;
    merge_context->remaining_contacts = contact_list;
    merge_context_next (merge_context);

    return merge_context;
}

static void
merge_context_free (MergeContext *merge_context)
{
    if (merge_context->source_client != NULL)
        g_object_unref (merge_context->source_client);

    if (merge_context->target_client != NULL)
        g_object_unref (merge_context->target_client);

    g_slice_free (MergeContext, merge_context);
}

static void
addressbook_selector_removed_cb (GObject *source_object, GAsyncResult *result, gpointer user_data)
{
    EBookClient *book_client = E_BOOK_CLIENT (source_object);
    MergeContext *merge_context = user_data;
    GError *error = NULL;

    e_book_client_remove_contact_finish (book_client, result, &error);
    if (error) {
        g_debug ("%s: Failed to remove contact: %s", G_STRFUNC, error->message);
        g_error_free (error);
    }

    merge_context->pending_removals--;

    if (merge_context->pending_adds)
        return;

    if (merge_context->pending_removals > 0)
        return;

    merge_context_free (merge_context);
}

static void
addressbook_selector_merge_next_cb (EBookClient *book_client,
                                    const GError *error,
                                    const gchar *id,
                                    gpointer closure)
{
    MergeContext *merge_context = closure;

    if (merge_context->remove_from_source && !error) {
        /* Remove previous contact from source. */
        e_book_client_remove_contact (
            merge_context->source_client,
            merge_context->current_contact, NULL,
            addressbook_selector_removed_cb, merge_context);
        merge_context->pending_removals++;
    }

    g_object_unref (merge_context->current_contact);

    if (merge_context->remaining_contacts != NULL) {
        merge_context_next (merge_context);
        eab_merging_book_add_contact (
            merge_context->target_client,
            merge_context->current_contact,
            addressbook_selector_merge_next_cb, merge_context);

    } else if (merge_context->pending_removals == 0) {
        merge_context_free (merge_context);
    } else
        merge_context->pending_adds = FALSE;
}

static void
addressbook_selector_load_primary_source (ESourceSelector *selector)
{
    ESourceList *source_list;
    ESource *source = NULL;
    GSList *groups;

    source_list = e_source_selector_get_source_list (selector);

    /* Dig up the first source in the source list.
     * XXX libedataserver should provide API for this. */
    groups = e_source_list_peek_groups (source_list);
    while (groups != NULL) {
        ESourceGroup *source_group = groups->data;
        GSList *sources;

        sources = e_source_group_peek_sources (source_group);
        if (sources != NULL) {
            source = sources->data;
            break;
        }

        groups = g_slist_next (groups);
    }

    if (source != NULL)
        e_source_selector_set_primary_selection (selector, source);
}

static void
addressbook_selector_set_property (GObject *object,
                                   guint property_id,
                                   const GValue *value,
                                   GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_CURRENT_VIEW:
            e_addressbook_selector_set_current_view (
                E_ADDRESSBOOK_SELECTOR (object),
                g_value_get_object (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
addressbook_selector_get_property (GObject *object,
                                   guint property_id,
                                   GValue *value,
                                   GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_CURRENT_VIEW:
            g_value_set_object (
                value,
                e_addressbook_selector_get_current_view (
                E_ADDRESSBOOK_SELECTOR (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
addressbook_selector_dispose (GObject *object)
{
    EAddressbookSelectorPrivate *priv;

    priv = E_ADDRESSBOOK_SELECTOR (object)->priv;

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

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

static void
addressbook_selector_constructed (GObject *object)
{
    ESourceSelector *selector;

    selector = E_SOURCE_SELECTOR (object);
    addressbook_selector_load_primary_source (selector);

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

static void
target_client_open_ready_cb (GObject *source_object, GAsyncResult *result, gpointer user_data)
{
    ESource *source = E_SOURCE (source_object);
    MergeContext *merge_context = user_data;
    EClient *client = NULL;
    GError *error = NULL;

    g_return_if_fail (merge_context != NULL);

    if (!e_client_utils_open_new_finish (source, result, &client, &error))
        client = NULL;

    if (error) {
        g_debug ("%s: Failed to open targer client: %s", G_STRFUNC, error->message);
        g_error_free (error);
    }

    merge_context->target_client = client ? E_BOOK_CLIENT (client) : NULL;

    if (!merge_context->target_client) {
        g_slist_foreach (merge_context->remaining_contacts, (GFunc) g_object_unref, NULL);
        g_slist_free (merge_context->remaining_contacts);

        merge_context_free (merge_context);
        return;
    }

    eab_merging_book_add_contact (
        merge_context->target_client, merge_context->current_contact,
        addressbook_selector_merge_next_cb, merge_context);
}

static gboolean
addressbook_selector_data_dropped (ESourceSelector *selector,
                                   GtkSelectionData *selection_data,
                                   ESource *destination,
                                   GdkDragAction action,
                                   guint info)
{
    EAddressbookSelectorPrivate *priv;
    MergeContext *merge_context;
    EAddressbookModel *model;
    EBookClient *source_client = NULL;
    GSList *list;
    const gchar *string;
    gboolean remove_from_source;

    priv = E_ADDRESSBOOK_SELECTOR (selector)->priv;
    g_return_val_if_fail (priv->current_view != NULL, FALSE);

    string = (const gchar *) gtk_selection_data_get_data (selection_data);
    remove_from_source = (action == GDK_ACTION_MOVE);

    /* XXX Function assumes both out arguments are provided.  All we
     *     care about is the contact list; source_client will be NULL. */
    eab_book_and_contact_list_from_string (string, &source_client, &list);
    if (source_client)
        g_object_unref (source_client);

    if (list == NULL)
        return FALSE;

    model = e_addressbook_view_get_model (priv->current_view);
    source_client = e_addressbook_model_get_client (model);
    g_return_val_if_fail (E_IS_BOOK_CLIENT (source_client), FALSE);

    merge_context = merge_context_new (g_object_ref (source_client), NULL, list);
    merge_context->remove_from_source = remove_from_source;
    merge_context->pending_adds = TRUE;

    e_client_utils_open_new (destination, E_CLIENT_SOURCE_TYPE_CONTACTS, FALSE, NULL,
        e_client_utils_authenticate_handler, NULL,
        target_client_open_ready_cb, merge_context);

    return TRUE;
}

static void
addressbook_selector_class_init (EAddressbookSelectorClass *class)
{
    GObjectClass *object_class;
    ESourceSelectorClass *selector_class;

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

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = addressbook_selector_set_property;
    object_class->get_property = addressbook_selector_get_property;
    object_class->dispose = addressbook_selector_dispose;
    object_class->constructed = addressbook_selector_constructed;

    selector_class = E_SOURCE_SELECTOR_CLASS (class);
    selector_class->data_dropped = addressbook_selector_data_dropped;

    g_object_class_install_property (
        object_class,
        PROP_CURRENT_VIEW,
        g_param_spec_object (
            "current-view",
            NULL,
            NULL,
            E_TYPE_ADDRESSBOOK_VIEW,
            G_PARAM_READWRITE));
}

static void
addressbook_selector_init (EAddressbookSelector *selector)
{
    selector->priv = G_TYPE_INSTANCE_GET_PRIVATE (
        selector, E_TYPE_ADDRESSBOOK_SELECTOR,
        EAddressbookSelectorPrivate);

    gtk_drag_dest_set (
        GTK_WIDGET (selector), GTK_DEST_DEFAULT_ALL,
        drag_types, G_N_ELEMENTS (drag_types),
        GDK_ACTION_COPY | GDK_ACTION_MOVE);

    e_drag_dest_add_directory_targets (GTK_WIDGET (selector));
}

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

    if (G_UNLIKELY (type == 0)) {
        const GTypeInfo type_info = {
            sizeof (EAddressbookSelectorClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) addressbook_selector_class_init,
            (GClassFinalizeFunc) NULL,
            NULL,  /* class_data */
            sizeof (EAddressbookSelector),
            0,     /* n_preallocs */
            (GInstanceInitFunc) addressbook_selector_init,
            NULL   /* value_table */
        };

        type = g_type_register_static (
            E_TYPE_SOURCE_SELECTOR, "EAddressbookSelector",
            &type_info, 0);
    }

    return type;
}

GtkWidget *
e_addressbook_selector_new (ESourceList *source_list)
{
    g_return_val_if_fail (E_IS_SOURCE_LIST (source_list), NULL);

    return g_object_new (
        E_TYPE_ADDRESSBOOK_SELECTOR,
        "source-list", source_list, NULL);
}

EAddressbookView *
e_addressbook_selector_get_current_view (EAddressbookSelector *selector)
{
    g_return_val_if_fail (E_IS_ADDRESSBOOK_SELECTOR (selector), NULL);

    return selector->priv->current_view;
}

void
e_addressbook_selector_set_current_view (EAddressbookSelector *selector,
                                         EAddressbookView *current_view)
{
    /* XXX This is only needed for moving contacts via drag-and-drop.
     *     The selection data doesn't include the source of the data
     *     (the model for the currently selected address book view),
     *     so we have to rely on it being provided to us.  I would
     *     be happy to see this function go away. */

    g_return_if_fail (E_IS_ADDRESSBOOK_SELECTOR (selector));

    if (current_view != NULL)
        g_return_if_fail (E_IS_ADDRESSBOOK_VIEW (current_view));

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

    if (current_view != NULL)
        g_object_ref (current_view);

    selector->priv->current_view = current_view;

    g_object_notify (G_OBJECT (selector), "current-view");
}