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/*
 * e-mail-config-notebook.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/>
 *
 */

#include "e-mail-config-notebook.h"

#include <libebackend/libebackend.h>

#include <mail/e-mail-config-defaults-page.h>
#include <mail/e-mail-config-identity-page.h>
#include <mail/e-mail-config-provider-page.h>
#include <mail/e-mail-config-receiving-page.h>
#include <mail/e-mail-config-security-page.h>
#include <mail/e-mail-config-sending-page.h>

#define E_MAIL_CONFIG_NOTEBOOK_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_MAIL_CONFIG_NOTEBOOK, EMailConfigNotebookPrivate))

typedef struct _AsyncContext AsyncContext;

struct _EMailConfigNotebookPrivate {
    EMailSession *session;
    ESource *account_source;
    ESource *identity_source;
    ESource *transport_source;
    ESource *collection_source;
};

struct _AsyncContext {
    ESourceRegistry *registry;
    GCancellable *cancellable;
    GQueue *page_queue;
    GQueue *source_queue;
};

enum {
    PROP_0,
    PROP_ACCOUNT_SOURCE,
    PROP_COLLECTION_SOURCE,
    PROP_COMPLETE,
    PROP_IDENTITY_SOURCE,
    PROP_SESSION,
    PROP_TRANSPORT_SOURCE
};

G_DEFINE_TYPE_WITH_CODE (
    EMailConfigNotebook,
    e_mail_config_notebook,
    GTK_TYPE_NOTEBOOK,
    G_IMPLEMENT_INTERFACE (
        E_TYPE_EXTENSIBLE, NULL))

static void
async_context_free (AsyncContext *async_context)
{
    if (async_context->registry != NULL)
        g_object_unref (async_context->registry);

    if (async_context->cancellable != NULL)
        g_object_unref (async_context->cancellable);

    g_queue_free_full (
        async_context->page_queue,
        (GDestroyNotify) g_object_unref);

    g_queue_free_full (
        async_context->source_queue,
        (GDestroyNotify) g_object_unref);

    g_slice_free (AsyncContext, async_context);
}

static void
mail_config_notebook_sort_pages (EMailConfigNotebook *notebook)
{
    GList *list, *link;
    gint ii = 0;

    list = g_list_sort (
        gtk_container_get_children (GTK_CONTAINER (notebook)),
        (GCompareFunc) e_mail_config_page_compare);

    for (link = list; link != NULL; link = g_list_next (link))
        gtk_notebook_reorder_child (
            GTK_NOTEBOOK (notebook),
            GTK_WIDGET (link->data), ii++);

    g_list_free (list);
}

static void
mail_config_notebook_page_changed (EMailConfigPage *page,
                                   EMailConfigNotebook *notebook)
{
    g_object_notify (G_OBJECT (notebook), "complete");
}

static void
mail_config_notebook_set_account_source (EMailConfigNotebook *notebook,
                                         ESource *account_source)
{
    g_return_if_fail (E_IS_SOURCE (account_source));
    g_return_if_fail (notebook->priv->account_source == NULL);

    notebook->priv->account_source = g_object_ref (account_source);
}

static void
mail_config_notebook_set_collection_source (EMailConfigNotebook *notebook,
                                            ESource *collection_source)
{
    g_return_if_fail (notebook->priv->collection_source == NULL);

    if (collection_source != NULL) {
        g_return_if_fail (E_IS_SOURCE (collection_source));
        g_object_ref (collection_source);
    }

    notebook->priv->collection_source = collection_source;
}

static void
mail_config_notebook_set_identity_source (EMailConfigNotebook *notebook,
                                          ESource *identity_source)
{
    g_return_if_fail (E_IS_SOURCE (identity_source));
    g_return_if_fail (notebook->priv->identity_source == NULL);

    notebook->priv->identity_source = g_object_ref (identity_source);
}

static void
mail_config_notebook_set_session (EMailConfigNotebook *notebook,
                                  EMailSession *session)
{
    g_return_if_fail (E_IS_MAIL_SESSION (session));
    g_return_if_fail (notebook->priv->session == NULL);

    notebook->priv->session = g_object_ref (session);
}

static void
mail_config_notebook_set_transport_source (EMailConfigNotebook *notebook,
                                           ESource *transport_source)
{
    g_return_if_fail (E_IS_SOURCE (transport_source));
    g_return_if_fail (notebook->priv->transport_source == NULL);

    notebook->priv->transport_source = g_object_ref (transport_source);
}

static void
mail_config_notebook_set_property (GObject *object,
                                   guint property_id,
                                   const GValue *value,
                                   GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_ACCOUNT_SOURCE:
            mail_config_notebook_set_account_source (
                E_MAIL_CONFIG_NOTEBOOK (object),
                g_value_get_object (value));
            return;

        case PROP_COLLECTION_SOURCE:
            mail_config_notebook_set_collection_source (
                E_MAIL_CONFIG_NOTEBOOK (object),
                g_value_get_object (value));
            return;

        case PROP_IDENTITY_SOURCE:
            mail_config_notebook_set_identity_source (
                E_MAIL_CONFIG_NOTEBOOK (object),
                g_value_get_object (value));
            return;

        case PROP_SESSION:
            mail_config_notebook_set_session (
                E_MAIL_CONFIG_NOTEBOOK (object),
                g_value_get_object (value));
            return;

        case PROP_TRANSPORT_SOURCE:
            mail_config_notebook_set_transport_source (
                E_MAIL_CONFIG_NOTEBOOK (object),
                g_value_get_object (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
mail_config_notebook_get_property (GObject *object,
                                   guint property_id,
                                   GValue *value,
                                   GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_ACCOUNT_SOURCE:
            g_value_set_object (
                value,
                e_mail_config_notebook_get_account_source (
                E_MAIL_CONFIG_NOTEBOOK (object)));
            return;

        case PROP_COLLECTION_SOURCE:
            g_value_set_object (
                value,
                e_mail_config_notebook_get_collection_source (
                E_MAIL_CONFIG_NOTEBOOK (object)));
            return;

        case PROP_COMPLETE:
            g_value_set_boolean (
                value,
                e_mail_config_notebook_check_complete (
                E_MAIL_CONFIG_NOTEBOOK (object)));
            return;

        case PROP_IDENTITY_SOURCE:
            g_value_set_object (
                value,
                e_mail_config_notebook_get_identity_source (
                E_MAIL_CONFIG_NOTEBOOK (object)));
            return;

        case PROP_SESSION:
            g_value_set_object (
                value,
                e_mail_config_notebook_get_session (
                E_MAIL_CONFIG_NOTEBOOK (object)));
            return;

        case PROP_TRANSPORT_SOURCE:
            g_value_set_object (
                value,
                e_mail_config_notebook_get_transport_source (
                E_MAIL_CONFIG_NOTEBOOK (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
mail_config_notebook_dispose (GObject *object)
{
    EMailConfigNotebookPrivate *priv;

    priv = E_MAIL_CONFIG_NOTEBOOK_GET_PRIVATE (object);

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

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

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

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

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

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

static void
mail_config_notebook_constructed (GObject *object)
{
    EMailConfigNotebook *notebook;
    ESource *source;
    ESourceRegistry *registry;
    ESourceExtension *extension;
    ESourceMailIdentity *mail_identity_extension;
    EMailConfigServiceBackend *backend;
    CamelProvider *provider = NULL;
    EMailSession *session;
    EMailConfigPage *page;
    const gchar *extension_name;
    gboolean add_receiving_page = TRUE;
    gboolean add_sending_page = TRUE;
    gboolean add_transport_source;
    gboolean online_account = FALSE;

    notebook = E_MAIL_CONFIG_NOTEBOOK (object);

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

    session = e_mail_config_notebook_get_session (notebook);
    registry = e_mail_session_get_registry (session);

    source = notebook->priv->identity_source;
    extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;
    extension = e_source_get_extension (source, extension_name);
    mail_identity_extension = E_SOURCE_MAIL_IDENTITY (extension);

    /* If we have a collection source and the collection source
     * has a [GNOME Online Accounts] or [Ubuntu Online Accounts]
     * extension, skip the Receiving and Sending pages since GOA
     * and UOA dictates those settings. */
    source = notebook->priv->collection_source;
    if (source != NULL) {
        extension_name = E_SOURCE_EXTENSION_GOA;
        if (e_source_has_extension (source, extension_name)) {
            online_account = TRUE;
            add_receiving_page = FALSE;
            add_sending_page = FALSE;
        }

        extension_name = E_SOURCE_EXTENSION_UOA;
        if (e_source_has_extension (source, extension_name)) {
            online_account = TRUE;
            add_receiving_page = FALSE;
            add_sending_page = FALSE;
        }
    }

    /* Keep all the display name properties synchronized.
     * We consider the identity source's display name to
     * be authoritative since technically that's the one
     * shown on the Identity page. */

    g_object_bind_property (
        notebook->priv->identity_source, "display-name",
        notebook->priv->account_source, "display-name",
        G_BINDING_SYNC_CREATE);

    g_object_bind_property (
        notebook->priv->identity_source, "display-name",
        notebook->priv->transport_source, "display-name",
        G_BINDING_SYNC_CREATE);

    if (notebook->priv->collection_source != NULL)
        g_object_bind_property (
            notebook->priv->identity_source, "display-name",
            notebook->priv->collection_source, "display-name",
            G_BINDING_SYNC_CREATE);

    /*** Identity Page ***/

    page = e_mail_config_identity_page_new (
        registry, notebook->priv->identity_source);
    e_mail_config_identity_page_set_show_instructions (
        E_MAIL_CONFIG_IDENTITY_PAGE (page), FALSE);
    if (online_account) {
        e_mail_config_identity_page_set_show_account_info (
            E_MAIL_CONFIG_IDENTITY_PAGE (page), FALSE);
        e_mail_config_identity_page_set_show_email_address (
            E_MAIL_CONFIG_IDENTITY_PAGE (page), FALSE);
    }
    e_mail_config_notebook_add_page (notebook, page);

    /*** Receiving Page ***/

    page = e_mail_config_receiving_page_new (registry);
    backend = e_mail_config_service_page_add_scratch_source (
        E_MAIL_CONFIG_SERVICE_PAGE (page),
        notebook->priv->account_source,
        notebook->priv->collection_source);
    if (add_receiving_page) {
        e_mail_config_notebook_add_page (notebook, page);

        g_object_bind_property (
            mail_identity_extension, "address",
            page, "email-address",
            G_BINDING_SYNC_CREATE);
    }

    if (backend != NULL)
        provider = e_mail_config_service_backend_get_provider (backend);

    /*** Receiving Options (conditional) ***/

    /* Note: We exclude this page if it has no options,
     *       but we don't know that until we create it. */
    page = backend ? e_mail_config_provider_page_new (backend) : NULL;
    if (page && e_mail_config_provider_page_is_empty (
            E_MAIL_CONFIG_PROVIDER_PAGE (page))) {
        g_object_unref (g_object_ref_sink (page));
    } else if (page) {
        e_mail_config_notebook_add_page (notebook, page);
    }

    /*** Sending Page (conditional) ***/

    add_transport_source =
        (provider != NULL) &&
        (!CAMEL_PROVIDER_IS_STORE_AND_TRANSPORT (provider));

    if (add_transport_source) {
        page = e_mail_config_sending_page_new (registry);
        e_mail_config_service_page_add_scratch_source (
            E_MAIL_CONFIG_SERVICE_PAGE (page),
            notebook->priv->transport_source,
            notebook->priv->collection_source);
        if (add_sending_page) {
            e_mail_config_notebook_add_page (notebook, page);

            g_object_bind_property (
                mail_identity_extension, "address",
                page, "email-address",
                G_BINDING_SYNC_CREATE);
        }
    }

    /*** Defaults Page ***/

    page = e_mail_config_defaults_page_new (
        session,
        notebook->priv->account_source,
        notebook->priv->identity_source);
    e_mail_config_notebook_add_page (notebook, page);

    /*** Security Page ***/

    page = e_mail_config_security_page_new (
        notebook->priv->identity_source);
    e_mail_config_notebook_add_page (notebook, page);

    e_extensible_load_extensions (E_EXTENSIBLE (notebook));
}

static void
mail_config_notebook_page_removed (GtkNotebook *notebook,
                                   GtkWidget *child,
                                   guint page_num)
{
    /* Do not chain up.  GtkNotebook does not implement this method. */

    if (E_IS_MAIL_CONFIG_PAGE (child))
        g_signal_handlers_disconnect_by_func (
            child, mail_config_notebook_page_changed,
            E_MAIL_CONFIG_NOTEBOOK (notebook));
}

static void
mail_config_notebook_page_added (GtkNotebook *notebook,
                                 GtkWidget *child,
                                 guint page_num)
{
    /* Do not chain up.  GtkNotebook does not implement this method. */

    if (E_IS_MAIL_CONFIG_PAGE (child))
        g_signal_connect (
            child, "changed",
            G_CALLBACK (mail_config_notebook_page_changed),
            E_MAIL_CONFIG_NOTEBOOK (notebook));
}

static void
e_mail_config_notebook_class_init (EMailConfigNotebookClass *class)
{
    GObjectClass *object_class;
    GtkNotebookClass *notebook_class;

    g_type_class_add_private (class, sizeof (EMailConfigNotebookPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = mail_config_notebook_set_property;
    object_class->get_property = mail_config_notebook_get_property;
    object_class->dispose = mail_config_notebook_dispose;
    object_class->constructed = mail_config_notebook_constructed;

    notebook_class = GTK_NOTEBOOK_CLASS (class);
    notebook_class->page_removed = mail_config_notebook_page_removed;
    notebook_class->page_added = mail_config_notebook_page_added;

    g_object_class_install_property (
        object_class,
        PROP_ACCOUNT_SOURCE,
        g_param_spec_object (
            "account-source",
            "Account Source",
            "Mail account source being edited",
            E_TYPE_SOURCE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT_ONLY |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_COLLECTION_SOURCE,
        g_param_spec_object (
            "collection-source",
            "Collection Source",
            "Optional collection source being edited",
            E_TYPE_SOURCE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT_ONLY |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_COMPLETE,
        g_param_spec_boolean (
            "complete",
            "Complete",
            "Whether all required fields are complete",
            FALSE,  /* default is not used */
            G_PARAM_READABLE |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_IDENTITY_SOURCE,
        g_param_spec_object (
            "identity-source",
            "Identity Source",
            "Mail identity source being edited",
            E_TYPE_SOURCE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT_ONLY |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_SESSION,
        g_param_spec_object (
            "session",
            "Session",
            "Mail session",
            E_TYPE_MAIL_SESSION,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT_ONLY |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_TRANSPORT_SOURCE,
        g_param_spec_object (
            "transport-source",
            "Transport Source",
            "Mail transport source being edited",
            E_TYPE_SOURCE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT_ONLY |
            G_PARAM_STATIC_STRINGS));
}

static void
e_mail_config_notebook_init (EMailConfigNotebook *notebook)
{
    notebook->priv = E_MAIL_CONFIG_NOTEBOOK_GET_PRIVATE (notebook);
}

GtkWidget *
e_mail_config_notebook_new (EMailSession *session,
                            ESource *account_source,
                            ESource *identity_source,
                            ESource *transport_source,
                            ESource *collection_source)
{
    g_return_val_if_fail (E_IS_MAIL_SESSION (session), NULL);
    g_return_val_if_fail (E_IS_SOURCE (account_source), NULL);
    g_return_val_if_fail (E_IS_SOURCE (identity_source), NULL);
    g_return_val_if_fail (E_IS_SOURCE (transport_source), NULL);

    /* A collection source is optional. */
    if (collection_source != NULL)
        g_return_val_if_fail (E_IS_SOURCE (collection_source), NULL);

    return g_object_new (
        E_TYPE_MAIL_CONFIG_NOTEBOOK,
        "session", session,
        "account-source", account_source,
        "identity-source", identity_source,
        "transport-source", transport_source,
        "collection-source", collection_source,
        NULL);
}

EMailSession *
e_mail_config_notebook_get_session (EMailConfigNotebook *notebook)
{
    g_return_val_if_fail (E_IS_MAIL_CONFIG_NOTEBOOK (notebook), NULL);

    return notebook->priv->session;
}

ESource *
e_mail_config_notebook_get_account_source (EMailConfigNotebook *notebook)
{
    g_return_val_if_fail (E_IS_MAIL_CONFIG_NOTEBOOK (notebook), NULL);

    return notebook->priv->account_source;
}

ESource *
e_mail_config_notebook_get_identity_source (EMailConfigNotebook *notebook)
{
    g_return_val_if_fail (E_IS_MAIL_CONFIG_NOTEBOOK (notebook), NULL);

    return notebook->priv->identity_source;
}

ESource *
e_mail_config_notebook_get_transport_source (EMailConfigNotebook *notebook)
{
    g_return_val_if_fail (E_IS_MAIL_CONFIG_NOTEBOOK (notebook), NULL);

    return notebook->priv->transport_source;
}

ESource *
e_mail_config_notebook_get_collection_source (EMailConfigNotebook *notebook)
{
    g_return_val_if_fail (E_IS_MAIL_CONFIG_NOTEBOOK (notebook), NULL);

    return notebook->priv->collection_source;
}

void
e_mail_config_notebook_add_page (EMailConfigNotebook *notebook,
                                 EMailConfigPage *page)
{
    EMailConfigPageInterface *page_interface;
    GtkWidget *tab_label;

    g_return_if_fail (E_IS_MAIL_CONFIG_NOTEBOOK (notebook));
    g_return_if_fail (E_IS_MAIL_CONFIG_PAGE (page));

    page_interface = E_MAIL_CONFIG_PAGE_GET_INTERFACE (page);
    tab_label = gtk_label_new (page_interface->title);

    gtk_widget_show (GTK_WIDGET (page));

    gtk_notebook_append_page (
        GTK_NOTEBOOK (notebook),
        GTK_WIDGET (page), tab_label);

    mail_config_notebook_sort_pages (notebook);
}

gboolean
e_mail_config_notebook_check_complete (EMailConfigNotebook *notebook)
{
    GList *list, *link;
    gboolean complete = TRUE;

    g_return_val_if_fail (E_IS_MAIL_CONFIG_NOTEBOOK (notebook), FALSE);

    list = gtk_container_get_children (GTK_CONTAINER (notebook));

    for (link = list; link != NULL; link = g_list_next (link)) {
        if (E_IS_MAIL_CONFIG_PAGE (link->data)) {
            EMailConfigPage *page;
            page = E_MAIL_CONFIG_PAGE (link->data);
            complete = e_mail_config_page_check_complete (page);

            if (!complete)
                break;
        }
    }

    g_list_free (list);

    return complete;
}

/********************** e_mail_config_notebook_commit() **********************/

static void
mail_config_notebook_page_submit_cb (GObject *source_object,
                                     GAsyncResult *result,
                                     gpointer user_data)
{
    GSimpleAsyncResult *simple;
    AsyncContext *async_context;
    EMailConfigPage *next_page;
    GError *error = NULL;

    simple = G_SIMPLE_ASYNC_RESULT (user_data);
    async_context = g_simple_async_result_get_op_res_gpointer (simple);

    e_mail_config_page_submit_finish (
        E_MAIL_CONFIG_PAGE (source_object), result, &error);

    if (error != NULL) {
        g_simple_async_result_take_error (simple, error);
        g_simple_async_result_complete (simple);
        g_object_unref (simple);
        return;
    }

    next_page = g_queue_pop_head (async_context->page_queue);

    /* Submit the next EMailConfigPage. */
    if (next_page != NULL) {
        e_mail_config_page_submit (
            next_page, async_context->cancellable,
            mail_config_notebook_page_submit_cb, simple);

        g_object_unref (next_page);

    /* All done! */
    } else {
        g_simple_async_result_complete (simple);
        g_object_unref (simple);
    }
}

static void
mail_config_notebook_source_commit_cb (GObject *source_object,
                                       GAsyncResult *result,
                                       gpointer user_data)
{
    GSimpleAsyncResult *simple;
    AsyncContext *async_context;
    ESource *next_source;
    GError *error = NULL;

    simple = G_SIMPLE_ASYNC_RESULT (user_data);
    async_context = g_simple_async_result_get_op_res_gpointer (simple);

    e_source_registry_commit_source_finish (
        E_SOURCE_REGISTRY (source_object), result, &error);

    if (error != NULL) {
        g_simple_async_result_take_error (simple, error);
        g_simple_async_result_complete (simple);
        g_object_unref (simple);
        return;
    }

    next_source = g_queue_pop_head (async_context->source_queue);

    /* Commit the next ESources. */
    if (next_source != NULL) {
        e_source_registry_commit_source (
            async_context->registry, next_source,
            async_context->cancellable,
            mail_config_notebook_source_commit_cb, simple);

        g_object_unref (next_source);

    /* ESources done, start on the EMailConfigPages. */
    } else {
        EMailConfigPage *page;

        /* There should be at least one page,
         * so we can skip the NULL check here. */
        page = g_queue_pop_head (async_context->page_queue);

        e_mail_config_page_submit (
            page, async_context->cancellable,
            mail_config_notebook_page_submit_cb, simple);

        g_object_unref (page);
    }
}

void
e_mail_config_notebook_commit (EMailConfigNotebook *notebook,
                               GCancellable *cancellable,
                               GAsyncReadyCallback callback,
                               gpointer user_data)
{
    GSimpleAsyncResult *simple;
    AsyncContext *async_context;
    ESourceRegistry *registry;
    EMailSession *session;
    ESource *source;
    GList *list, *link;
    GQueue *page_queue;
    GQueue *source_queue;

    g_return_if_fail (E_IS_MAIL_CONFIG_NOTEBOOK (notebook));

    session = e_mail_config_notebook_get_session (notebook);
    registry = e_mail_session_get_registry (session);

    page_queue = g_queue_new ();
    source_queue = g_queue_new ();

    /* Queue the collection data source if one is defined. */
    source = e_mail_config_notebook_get_collection_source (notebook);
    if (source != NULL)
        g_queue_push_tail (source_queue, g_object_ref (source));

    /* Queue the mail-related data sources for the account. */
    source = e_mail_config_notebook_get_account_source (notebook);
    if (source != NULL)
        g_queue_push_tail (source_queue, g_object_ref (source));
    source = e_mail_config_notebook_get_identity_source (notebook);
    if (source != NULL)
        g_queue_push_tail (source_queue, g_object_ref (source));
    source = e_mail_config_notebook_get_transport_source (notebook);
    if (source != NULL)
        g_queue_push_tail (source_queue, g_object_ref (source));

    list = gtk_container_get_children (GTK_CONTAINER (notebook));

    /* Tell all EMailConfigPages to commit their UI state to their
     * scratch ESources and push any additional data sources on to
     * the given source queue, such as calendars or address books
     * to be bundled with the mail account. */
    for (link = list; link != NULL; link = g_list_next (link)) {
        if (E_IS_MAIL_CONFIG_PAGE (link->data)) {
            EMailConfigPage *page;
            page = E_MAIL_CONFIG_PAGE (link->data);
            g_queue_push_tail (page_queue, g_object_ref (page));
            e_mail_config_page_commit_changes (page, source_queue);
        }
    }

    g_list_free (list);

    async_context = g_slice_new0 (AsyncContext);
    async_context->registry = g_object_ref (registry);
    async_context->page_queue = page_queue;      /* takes ownership */
    async_context->source_queue = source_queue;  /* takes ownership */

    if (G_IS_CANCELLABLE (cancellable))
        async_context->cancellable = g_object_ref (cancellable);

    simple = g_simple_async_result_new (
        G_OBJECT (notebook), callback, user_data,
        e_mail_config_notebook_commit);

    g_simple_async_result_set_op_res_gpointer (
        simple, async_context, (GDestroyNotify) async_context_free);

    source = g_queue_pop_head (async_context->source_queue);
    g_return_if_fail (E_IS_SOURCE (source));

    e_source_registry_commit_source (
        async_context->registry, source,
        async_context->cancellable,
        mail_config_notebook_source_commit_cb, simple);

    g_object_unref (source);
}

gboolean
e_mail_config_notebook_commit_finish (EMailConfigNotebook *notebook,
                                      GAsyncResult *result,
                                      GError **error)
{
    GSimpleAsyncResult *simple;

    g_return_val_if_fail (
        g_simple_async_result_is_valid (
        result, G_OBJECT (notebook),
        e_mail_config_notebook_commit), FALSE);

    simple = G_SIMPLE_ASYNC_RESULT (result);

    /* Assume success unless a GError is set. */
    return !g_simple_async_result_propagate_error (simple, error);
}