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/*
 * e-source-config.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.
 *
 * 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 Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "e-source-config.h"

#include <config.h>
#include <glib/gi18n-lib.h>

#include <libebackend/libebackend.h>

#include "e-interval-chooser.h"
#include "e-marshal.h"
#include "e-source-config-backend.h"

#define E_SOURCE_CONFIG_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_SOURCE_CONFIG, ESourceConfigPrivate))

typedef struct _Candidate Candidate;

struct _ESourceConfigPrivate {
    ESource *original_source;
    ESource *collection_source;
    ESourceRegistry *registry;

    GHashTable *backends;
    GPtrArray *candidates;

    GtkWidget *type_label;
    GtkWidget *type_combo;
    GtkWidget *name_label;
    GtkWidget *name_entry;
    GtkWidget *backend_box;
    GtkSizeGroup *size_group;

    gboolean complete;
};

struct _Candidate {
    GtkWidget *page;
    ESource *scratch_source;
    ESourceConfigBackend *backend;
    gulong changed_handler_id;
};

enum {
    PROP_0,
    PROP_COLLECTION_SOURCE,
    PROP_COMPLETE,
    PROP_ORIGINAL_SOURCE,
    PROP_REGISTRY
};

enum {
    CHECK_COMPLETE,
    COMMIT_CHANGES,
    INIT_CANDIDATE,
    RESIZE_WINDOW,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL];

G_DEFINE_TYPE_WITH_CODE (
    ESourceConfig,
    e_source_config,
    GTK_TYPE_BOX,
    G_IMPLEMENT_INTERFACE (
        E_TYPE_EXTENSIBLE, NULL))

static void
source_config_init_backends (ESourceConfig *config)
{
    GList *list, *iter;

    config->priv->backends = g_hash_table_new_full (
        (GHashFunc) g_str_hash,
        (GEqualFunc) g_str_equal,
        (GDestroyNotify) g_free,
        (GDestroyNotify) g_object_unref);

    e_extensible_load_extensions (E_EXTENSIBLE (config));

    list = e_extensible_list_extensions (
        E_EXTENSIBLE (config), E_TYPE_SOURCE_CONFIG_BACKEND);

    for (iter = list; iter != NULL; iter = g_list_next (iter)) {
        ESourceConfigBackend *backend;
        ESourceConfigBackendClass *class;

        backend = E_SOURCE_CONFIG_BACKEND (iter->data);
        class = E_SOURCE_CONFIG_BACKEND_GET_CLASS (backend);

        if (class->backend_name != NULL)
            g_hash_table_insert (
                config->priv->backends,
                g_strdup (class->backend_name),
                g_object_ref (backend));
    }

    g_list_free (list);
}

static gint
source_config_compare_sources (gconstpointer a,
                               gconstpointer b,
                               gpointer user_data)
{
    ESource *source_a;
    ESource *source_b;
    ESource *parent_a;
    ESource *parent_b;
    ESourceConfig *config;
    ESourceRegistry *registry;
    const gchar *parent_uid_a;
    const gchar *parent_uid_b;
    gint result;

    source_a = E_SOURCE (a);
    source_b = E_SOURCE (b);
    config = E_SOURCE_CONFIG (user_data);

    if (e_source_equal (source_a, source_b))
        return 0;

    /* "On This Computer" always comes first. */

    parent_uid_a = e_source_get_parent (source_a);
    parent_uid_b = e_source_get_parent (source_b);

    if (g_strcmp0 (parent_uid_a, "local-stub") == 0)
        return -1;

    if (g_strcmp0 (parent_uid_b, "local-stub") == 0)
        return 1;

    registry = e_source_config_get_registry (config);

    parent_a = e_source_registry_ref_source (registry, parent_uid_a);
    parent_b = e_source_registry_ref_source (registry, parent_uid_b);

    g_return_val_if_fail (parent_a != NULL, 1);
    g_return_val_if_fail (parent_b != NULL, -1);

    result = e_source_compare_by_display_name (parent_a, parent_b);

    g_object_unref (parent_a);
    g_object_unref (parent_b);

    return result;
}

static void
source_config_add_candidate (ESourceConfig *config,
                             ESource *scratch_source,
                             ESourceConfigBackend *backend)
{
    Candidate *candidate;
    GtkBox *backend_box;
    GtkLabel *type_label;
    GtkComboBoxText *type_combo;
    GtkWidget *widget;
    ESource *parent_source;
    ESourceRegistry *registry;
    const gchar *display_name;
    const gchar *parent_uid;
    gulong handler_id;

    backend_box = GTK_BOX (config->priv->backend_box);
    type_label = GTK_LABEL (config->priv->type_label);
    type_combo = GTK_COMBO_BOX_TEXT (config->priv->type_combo);

    registry = e_source_config_get_registry (config);
    parent_uid = e_source_get_parent (scratch_source);
    parent_source = e_source_registry_ref_source (registry, parent_uid);
    g_return_if_fail (parent_source != NULL);

    candidate = g_slice_new (Candidate);
    candidate->backend = g_object_ref (backend);
    candidate->scratch_source = g_object_ref (scratch_source);

    /* Do not show the page here. */
    widget = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
    gtk_box_pack_start (backend_box, widget, FALSE, FALSE, 0);
    candidate->page = g_object_ref_sink (widget);

    g_ptr_array_add (config->priv->candidates, candidate);

    display_name = e_source_get_display_name (parent_source);
    gtk_combo_box_text_append_text (type_combo, display_name);
    gtk_label_set_text (type_label, display_name);

    /* Make sure the combo box has a valid active item before
     * adding widgets.  Otherwise we'll get run-time warnings
     * as property bindings are set up. */
    if (gtk_combo_box_get_active (GTK_COMBO_BOX (type_combo)) == -1)
        gtk_combo_box_set_active (GTK_COMBO_BOX (type_combo), 0);

    /* Bind the standard widgets to the new scratch source. */
    g_signal_emit (
        config, signals[INIT_CANDIDATE], 0,
        candidate->scratch_source);

    /* Insert any backend-specific widgets. */
    e_source_config_backend_insert_widgets (
        candidate->backend, candidate->scratch_source);

    handler_id = g_signal_connect_swapped (
        candidate->scratch_source, "changed",
        G_CALLBACK (e_source_config_check_complete), config);

    candidate->changed_handler_id = handler_id;

    /* Trigger the "changed" handler we just connected to set the
     * initial "complete" state based on the widgets we just added. */
    e_source_changed (candidate->scratch_source);

    g_object_unref (parent_source);
}

static void
source_config_free_candidate (Candidate *candidate)
{
    g_signal_handler_disconnect (
        candidate->scratch_source,
        candidate->changed_handler_id);

    g_object_unref (candidate->page);
    g_object_unref (candidate->scratch_source);
    g_object_unref (candidate->backend);

    g_slice_free (Candidate, candidate);
}

static Candidate *
source_config_get_active_candidate (ESourceConfig *config)
{
    GtkComboBox *type_combo;
    gint index;

    type_combo = GTK_COMBO_BOX (config->priv->type_combo);
    index = gtk_combo_box_get_active (type_combo);
    g_return_val_if_fail (index >= 0, NULL);

    return g_ptr_array_index (config->priv->candidates, index);
}

static void
source_config_type_combo_changed_cb (GtkComboBox *type_combo,
                                     ESourceConfig *config)
{
    Candidate *candidate;
    GPtrArray *array;
    gint index;

    array = config->priv->candidates;

    for (index = 0; index < array->len; index++) {
        candidate = g_ptr_array_index (array, index);
        gtk_widget_hide (candidate->page);
    }

    index = gtk_combo_box_get_active (type_combo);
    if (index == CLAMP (index, 0, array->len)) {
        candidate = g_ptr_array_index (array, index);
        gtk_widget_show (candidate->page);
    }

    e_source_config_resize_window (config);
    e_source_config_check_complete (config);
}

static gboolean
source_config_init_for_adding_source_foreach (gpointer key,
                                              gpointer value,
                                              gpointer user_data)
{
    ESource *scratch_source;
    ESourceBackend *extension;
    ESourceConfig *config;
    ESourceConfigBackend *backend;
    ESourceConfigBackendClass *class;
    const gchar *extension_name;

    scratch_source = E_SOURCE (key);
    backend = E_SOURCE_CONFIG_BACKEND (value);
    config = E_SOURCE_CONFIG (user_data);

    /* This may not be the correct backend name for the child of a
     * collection.  For example, the "yahoo" collection backend uses
     * the "caldav" calender backend for calendar children.  But the
     * ESourceCollectionBackend can override our setting if needed. */
    class = E_SOURCE_CONFIG_BACKEND_GET_CLASS (backend);
    extension_name = e_source_config_get_backend_extension_name (config);
    extension = e_source_get_extension (scratch_source, extension_name);
    e_source_backend_set_backend_name (extension, class->backend_name);

    source_config_add_candidate (config, scratch_source, backend);

    return FALSE;  /* don't stop traversal */
}

static void
source_config_init_for_adding_source (ESourceConfig *config)
{
    GList *list, *link;
    ESourceRegistry *registry;
    GTree *scratch_source_tree;

    /* Candidates are drawn from two sources:
     *
     * ESourceConfigBackend classes that specify a fixed parent UID,
     * meaning there exists one only possible parent source for any
     * scratch source created by the backend.  The fixed parent UID
     * should be a built-in "stub" placeholder ("local-stub", etc).
     *
     * -and-
     *
     * Collection sources.  We let ESourceConfig subclasses gather
     * eligible collection sources to serve as parents for scratch
     * sources.  A scratch source is matched to a backend based on
     * the collection's backend name.  The "calendar-enabled" and
     * "contacts-enabled" settings also factor into eligibility.
     */

    /* Use a GTree instead of a GHashTable so inserted scratch
     * sources automatically sort themselves by their parent's
     * display name. */
    scratch_source_tree = g_tree_new_full (
        source_config_compare_sources, config,
        (GDestroyNotify) g_object_unref,
        (GDestroyNotify) g_object_unref);

    registry = e_source_config_get_registry (config);

    /* First pick out the backends with a fixed parent UID. */

    list = g_hash_table_get_values (config->priv->backends);

    for (link = list; link != NULL; link = g_list_next (link)) {
        ESourceConfigBackend *backend;
        ESourceConfigBackendClass *class;
        ESource *scratch_source;
        ESource *parent_source;
        gboolean parent_is_disabled;

        backend = E_SOURCE_CONFIG_BACKEND (link->data);
        class = E_SOURCE_CONFIG_BACKEND_GET_CLASS (backend);

        if (class->parent_uid == NULL)
            continue;

        /* Verify the fixed parent UID is valid. */
        parent_source = e_source_registry_ref_source (
            registry, class->parent_uid);
        if (parent_source == NULL) {
            g_warning (
                "%s: %sClass specifies "
                "an invalid parent_uid '%s'",
                G_STRFUNC,
                G_OBJECT_TYPE_NAME (backend),
                class->parent_uid);
            continue;
        }
        parent_is_disabled = !e_source_get_enabled (parent_source);
        g_object_unref (parent_source);

        /* It's unusual for a fixed parent source to be disabled.
         * A user would have to go out of his way to do this, but
         * we should honor it regardless. */
        if (parent_is_disabled)
            continue;

        /* Some backends don't allow new sources to be created.
         * The "contacts" calendar backend is one such example. */
        if (!e_source_config_backend_allow_creation (backend))
            continue;

        scratch_source = e_source_new (NULL, NULL, NULL);
        g_return_if_fail (scratch_source != NULL);

        e_source_set_parent (scratch_source, class->parent_uid);

        g_tree_insert (
            scratch_source_tree,
            g_object_ref (scratch_source),
            g_object_ref (backend));

        g_object_unref (scratch_source);
    }

    g_list_free (list);

    /* Next gather eligible collection sources to serve as parents. */

    list = e_source_config_list_eligible_collections (config);

    for (link = list; link != NULL; link = g_list_next (link)) {
        ESource *parent_source;
        ESource *scratch_source;
        ESourceBackend *extension;
        ESourceConfigBackend *backend = NULL;
        const gchar *backend_name;
        const gchar *parent_uid;

        parent_source = E_SOURCE (link->data);
        parent_uid = e_source_get_uid (parent_source);

        extension = e_source_get_extension (
            parent_source, E_SOURCE_EXTENSION_COLLECTION);
        backend_name = e_source_backend_get_backend_name (extension);

        if (backend_name != NULL)
            backend = g_hash_table_lookup (
                config->priv->backends, backend_name);

        if (backend == NULL)
            continue;

        /* Some backends disallow creating certain types of
         * resources.  For example, the Exchange Web Services
         * backend disallows creating new memo lists. */
        if (!e_source_config_backend_allow_creation (backend))
            continue;

        scratch_source = e_source_new (NULL, NULL, NULL);
        g_return_if_fail (scratch_source != NULL);

        e_source_set_parent (scratch_source, parent_uid);

        g_tree_insert (
            scratch_source_tree,
            g_object_ref (scratch_source),
            g_object_ref (backend));

        g_object_unref (scratch_source);
    }

    g_list_free_full (list, (GDestroyNotify) g_object_unref);

    /* XXX GTree doesn't get as much love as GHashTable.
     *     It's missing an equivalent to GHashTableIter. */
    g_tree_foreach (
        scratch_source_tree,
        source_config_init_for_adding_source_foreach, config);

    g_tree_unref (scratch_source_tree);
}

static void
source_config_init_for_editing_source (ESourceConfig *config)
{
    ESource *original_source;
    ESource *scratch_source;
    ESourceBackend *extension;
    ESourceConfigBackend *backend;
    GDBusObject *dbus_object;
    const gchar *backend_name;
    const gchar *extension_name;

    original_source = e_source_config_get_original_source (config);
    g_return_if_fail (original_source != NULL);

    extension_name = e_source_config_get_backend_extension_name (config);
    extension = e_source_get_extension (original_source, extension_name);
    backend_name = e_source_backend_get_backend_name (extension);
    g_return_if_fail (backend_name != NULL);

    backend = g_hash_table_lookup (config->priv->backends, backend_name);
    g_return_if_fail (backend != NULL);

    dbus_object = e_source_ref_dbus_object (original_source);
    g_return_if_fail (dbus_object != NULL);

    scratch_source = e_source_new (dbus_object, NULL, NULL);
    g_return_if_fail (scratch_source != NULL);

    source_config_add_candidate (config, scratch_source, backend);

    g_object_unref (scratch_source);
    g_object_unref (dbus_object);
}

static void
source_config_set_original_source (ESourceConfig *config,
                                   ESource *original_source)
{
    g_return_if_fail (config->priv->original_source == NULL);

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

    config->priv->original_source = original_source;
}

static void
source_config_set_registry (ESourceConfig *config,
                            ESourceRegistry *registry)
{
    g_return_if_fail (E_IS_SOURCE_REGISTRY (registry));
    g_return_if_fail (config->priv->registry == NULL);

    config->priv->registry = g_object_ref (registry);
}

static void
source_config_set_property (GObject *object,
                            guint property_id,
                            const GValue *value,
                            GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_ORIGINAL_SOURCE:
            source_config_set_original_source (
                E_SOURCE_CONFIG (object),
                g_value_get_object (value));
            return;

        case PROP_REGISTRY:
            source_config_set_registry (
                E_SOURCE_CONFIG (object),
                g_value_get_object (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
source_config_get_property (GObject *object,
                            guint property_id,
                            GValue *value,
                            GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_COLLECTION_SOURCE:
            g_value_set_object (
                value,
                e_source_config_get_collection_source (
                E_SOURCE_CONFIG (object)));
            return;

        case PROP_COMPLETE:
            g_value_set_boolean (
                value,
                e_source_config_check_complete (
                E_SOURCE_CONFIG (object)));
            return;

        case PROP_ORIGINAL_SOURCE:
            g_value_set_object (
                value,
                e_source_config_get_original_source (
                E_SOURCE_CONFIG (object)));
            return;

        case PROP_REGISTRY:
            g_value_set_object (
                value,
                e_source_config_get_registry (
                E_SOURCE_CONFIG (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
source_config_dispose (GObject *object)
{
    ESourceConfigPrivate *priv;

    priv = E_SOURCE_CONFIG_GET_PRIVATE (object);

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

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

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

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

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

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

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

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

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

    g_hash_table_remove_all (priv->backends);
    g_ptr_array_set_size (priv->candidates, 0);

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

static void
source_config_finalize (GObject *object)
{
    ESourceConfigPrivate *priv;

    priv = E_SOURCE_CONFIG_GET_PRIVATE (object);

    g_hash_table_destroy (priv->backends);
    g_ptr_array_free (priv->candidates, TRUE);

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

static void
source_config_constructed (GObject *object)
{
    ESourceConfig *config;
    ESourceRegistry *registry;
    ESource *original_source;
    ESource *collection_source = NULL;

    config = E_SOURCE_CONFIG (object);
    registry = e_source_config_get_registry (config);
    original_source = e_source_config_get_original_source (config);

    /* If we have an original source, see if it's part
     * of a collection and note the collection source. */
    if (original_source != NULL) {
        const gchar *extension_name;

        extension_name = E_SOURCE_EXTENSION_COLLECTION;
        collection_source = e_source_registry_find_extension (
            registry, original_source, extension_name);
        config->priv->collection_source = collection_source;
    }

    if (original_source != NULL)
        e_source_config_insert_widget (
            config, NULL, _("Type:"),
            config->priv->type_label);
    else
        e_source_config_insert_widget (
            config, NULL, _("Type:"),
            config->priv->type_combo);

    /* If the original source is part of a collection then we assume
     * the display name is server-assigned and not user-assigned, at
     * least not assigned through Evolution. */
    if (collection_source != NULL)
        e_source_config_insert_widget (
            config, NULL, _("Name:"),
            config->priv->name_label);
    else
        e_source_config_insert_widget (
            config, NULL, _("Name:"),
            config->priv->name_entry);

    source_config_init_backends (config);
}

static void
source_config_realize (GtkWidget *widget)
{
    ESourceConfig *config;
    ESource *original_source;

    /* Chain up to parent's realize() method. */
    GTK_WIDGET_CLASS (e_source_config_parent_class)->realize (widget);

    /* Do this after constructed() so subclasses can fully
     * initialize themselves before we add candidates. */

    config = E_SOURCE_CONFIG (widget);
    original_source = e_source_config_get_original_source (config);

    if (original_source == NULL)
        source_config_init_for_adding_source (config);
    else
        source_config_init_for_editing_source (config);

    /* Connect this signal AFTER we're done adding candidates
     * so we don't trigger check_complete() before candidates
     * have a chance to insert widgets. */
    g_signal_connect (
        config->priv->type_combo, "changed",
        G_CALLBACK (source_config_type_combo_changed_cb), config);

    /* Trigger the callback to make sure the right page
     * is selected, window is an appropriate size, etc. */
    g_signal_emit_by_name (config->priv->type_combo, "changed");
}

static GList *
source_config_list_eligible_collections (ESourceConfig *config)
{
    ESourceRegistry *registry;
    GQueue trash = G_QUEUE_INIT;
    GList *list, *link;
    const gchar *extension_name;

    extension_name = E_SOURCE_EXTENSION_COLLECTION;
    registry = e_source_config_get_registry (config);

    list = e_source_registry_list_sources (registry, extension_name);

    for (link = list; link != NULL; link = g_list_next (link)) {
        ESource *source = E_SOURCE (link->data);
        gboolean elligible;

        elligible =
            e_source_get_enabled (source) &&
            e_source_get_remote_creatable (source);

        if (!elligible)
            g_queue_push_tail (&trash, link);
    }

    /* Remove ineligible collections from the list. */
    while ((link = g_queue_pop_head (&trash)) != NULL) {
        g_object_unref (link->data);
        list = g_list_delete_link (list, link);
    }

    return list;
}

static void
source_config_init_candidate (ESourceConfig *config,
                              ESource *scratch_source)
{
    g_object_bind_property (
        scratch_source, "display-name",
        config->priv->name_label, "label",
        G_BINDING_SYNC_CREATE);

    g_object_bind_property (
        scratch_source, "display-name",
        config->priv->name_entry, "text",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE);
}

static gboolean
source_config_check_complete (ESourceConfig *config,
                              ESource *scratch_source)
{
    GtkEntry *name_entry;
    GtkComboBox *type_combo;
    const gchar *text;

    /* Make sure the Type: combo box has a valid item. */
    type_combo = GTK_COMBO_BOX (config->priv->type_combo);
    if (gtk_combo_box_get_active (type_combo) < 0)
        return FALSE;

    /* Make sure the Name: entry field is not empty. */
    name_entry = GTK_ENTRY (config->priv->name_entry);
    text = gtk_entry_get_text (name_entry);
    if (text == NULL || *text == '\0')
        return FALSE;

    return TRUE;
}

static void
source_config_commit_changes (ESourceConfig *config,
                              ESource *scratch_source)
{
    /* Placeholder so subclasses can safely chain up. */
}

static void
source_config_resize_window (ESourceConfig *config)
{
    GtkWidget *toplevel;

    /* Expand or shrink our parent window vertically to accommodate
     * the newly selected backend's options.  Some backends have tons
     * of options, some have few.  This avoids the case where you
     * select a backend with tons of options and then a backend with
     * few options and wind up with lots of unused vertical space. */

    toplevel = gtk_widget_get_toplevel (GTK_WIDGET (config));

    if (GTK_IS_WINDOW (toplevel)) {
        GtkWindow *window = GTK_WINDOW (toplevel);
        GtkAllocation allocation;

        gtk_widget_get_allocation (toplevel, &allocation);
        gtk_window_resize (window, allocation.width, 1);
    }
}

static gboolean
source_config_check_complete_accumulator (GSignalInvocationHint *ihint,
                                          GValue *return_accu,
                                          const GValue *handler_return,
                                          gpointer unused)
{
    gboolean v_boolean;

    /* Abort emission if a handler returns FALSE. */
    v_boolean = g_value_get_boolean (handler_return);
    g_value_set_boolean (return_accu, v_boolean);

    return v_boolean;
}

static void
e_source_config_class_init (ESourceConfigClass *class)
{
    GObjectClass *object_class;
    GtkWidgetClass *widget_class;

    g_type_class_add_private (class, sizeof (ESourceConfigPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = source_config_set_property;
    object_class->get_property = source_config_get_property;
    object_class->dispose = source_config_dispose;
    object_class->finalize = source_config_finalize;
    object_class->constructed = source_config_constructed;

    widget_class = GTK_WIDGET_CLASS (class);
    widget_class->realize = source_config_realize;

    class->list_eligible_collections =
        source_config_list_eligible_collections;
    class->init_candidate = source_config_init_candidate;
    class->check_complete = source_config_check_complete;
    class->commit_changes = source_config_commit_changes;
    class->resize_window = source_config_resize_window;

    g_object_class_install_property (
        object_class,
        PROP_COLLECTION_SOURCE,
        g_param_spec_object (
            "collection-source",
            "Collection Source",
            "The collection ESource to which "
            "the ESource being edited belongs",
            E_TYPE_SOURCE,
            G_PARAM_READABLE |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_COMPLETE,
        g_param_spec_boolean (
            "complete",
            "Complete",
            "Are the required fields complete?",
            FALSE,
            G_PARAM_READABLE |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_ORIGINAL_SOURCE,
        g_param_spec_object (
            "original-source",
            "Original Source",
            "The original ESource",
            E_TYPE_SOURCE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT_ONLY |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_REGISTRY,
        g_param_spec_object (
            "registry",
            "Registry",
            "Registry of ESources",
            E_TYPE_SOURCE_REGISTRY,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT_ONLY |
            G_PARAM_STATIC_STRINGS));

    signals[CHECK_COMPLETE] = g_signal_new (
        "check-complete",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ESourceConfigClass, check_complete),
        source_config_check_complete_accumulator, NULL,
        e_marshal_BOOLEAN__OBJECT,
        G_TYPE_BOOLEAN, 1,
        E_TYPE_SOURCE);

    signals[COMMIT_CHANGES] = g_signal_new (
        "commit-changes",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ESourceConfigClass, commit_changes),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        E_TYPE_SOURCE);

    signals[INIT_CANDIDATE] = g_signal_new (
        "init-candidate",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ESourceConfigClass, init_candidate),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        E_TYPE_SOURCE);

    signals[RESIZE_WINDOW] = g_signal_new (
        "resize-window",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ESourceConfigClass, resize_window),
        NULL, NULL,
        g_cclosure_marshal_VOID__VOID,
        G_TYPE_NONE, 0);
}

static void
e_source_config_init (ESourceConfig *config)
{
    GPtrArray *candidates;
    GtkSizeGroup *size_group;
    PangoAttribute *attr;
    PangoAttrList *attr_list;
    GtkWidget *widget;

    /* The candidates array holds scratch ESources, one for each
     * item in the "type" combo box.  Scratch ESources are never
     * added to the registry, so backend extensions can make any
     * changes they want to them.  Whichever scratch ESource is
     * "active" (selected in the "type" combo box) when the user
     * clicks OK wins and is written to disk.  The others are
     * discarded. */
    candidates = g_ptr_array_new_with_free_func (
        (GDestroyNotify) source_config_free_candidate);

    /* The size group is used for caption labels. */
    size_group = gtk_size_group_new (GTK_SIZE_GROUP_HORIZONTAL);

    gtk_box_set_spacing (GTK_BOX (config), 6);

    gtk_orientable_set_orientation (
        GTK_ORIENTABLE (config), GTK_ORIENTATION_VERTICAL);

    config->priv = E_SOURCE_CONFIG_GET_PRIVATE (config);
    config->priv->candidates = candidates;
    config->priv->size_group = size_group;

    attr_list = pango_attr_list_new ();

    attr = pango_attr_weight_new (PANGO_WEIGHT_BOLD);
    pango_attr_list_insert (attr_list, attr);

    /* Either the source type combo box or the label is shown,
     * never both.  But we create both widgets and keep them
     * both up-to-date because it makes the logic simpler. */

    widget = gtk_label_new (NULL);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.5);
    gtk_label_set_attributes (GTK_LABEL (widget), attr_list);
    config->priv->type_label = g_object_ref_sink (widget);
    gtk_widget_show (widget);

    widget = gtk_combo_box_text_new ();
    config->priv->type_combo = g_object_ref_sink (widget);
    gtk_widget_show (widget);

    /* Similarly for the display name.  Either the text entry
     * or the label is shown, depending on whether the source
     * is a collection member (new sources never are). */

    widget = gtk_label_new (NULL);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.5);
    gtk_label_set_attributes (GTK_LABEL (widget), attr_list);
    config->priv->name_label = g_object_ref_sink (widget);
    gtk_widget_show (widget);

    widget = gtk_entry_new ();
    gtk_entry_set_activates_default (GTK_ENTRY (widget), TRUE);
    config->priv->name_entry = g_object_ref_sink (widget);
    gtk_widget_show (widget);

    /* The backend box holds backend-specific options.  Each backend
     * gets a child widget.  Only one child widget is visible at once. */
    widget = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
    gtk_box_pack_end (GTK_BOX (config), widget, TRUE, TRUE, 0);
    config->priv->backend_box = g_object_ref (widget);
    gtk_widget_show (widget);

    pango_attr_list_unref (attr_list);
}

GtkWidget *
e_source_config_new (ESourceRegistry *registry,
                     ESource *original_source)
{
    g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), NULL);

    if (original_source != NULL)
        g_return_val_if_fail (E_IS_SOURCE (original_source), NULL);

    return g_object_new (
        E_TYPE_SOURCE_CONFIG, "registry", registry,
        "original-source", original_source, NULL);
}

void
e_source_config_insert_widget (ESourceConfig *config,
                               ESource *scratch_source,
                               const gchar *caption,
                               GtkWidget *widget)
{
    GtkWidget *hbox;
    GtkWidget *vbox;
    GtkWidget *label;

    g_return_if_fail (E_IS_SOURCE_CONFIG (config));
    g_return_if_fail (GTK_IS_WIDGET (widget));

    if (scratch_source == NULL)
        vbox = GTK_WIDGET (config);
    else
        vbox = e_source_config_get_page (config, scratch_source);

    hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 12);
    gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, TRUE, 0);

    g_object_bind_property (
        widget, "visible",
        hbox, "visible",
        G_BINDING_SYNC_CREATE);

    label = gtk_label_new (caption);
    gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
    gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, TRUE, 0);
    gtk_size_group_add_widget (config->priv->size_group, label);
    gtk_widget_show (label);

    gtk_box_pack_start (GTK_BOX (hbox), widget, TRUE, TRUE, 0);
}

GtkWidget *
e_source_config_get_page (ESourceConfig *config,
                          ESource *scratch_source)
{
    Candidate *candidate;
    GtkWidget *page = NULL;
    GPtrArray *array;
    gint index;

    g_return_val_if_fail (E_IS_SOURCE_CONFIG (config), NULL);
    g_return_val_if_fail (E_IS_SOURCE (scratch_source), NULL);

    array = config->priv->candidates;

    for (index = 0; page == NULL && index < array->len; index++) {
        candidate = g_ptr_array_index (array, index);
        if (e_source_equal (scratch_source, candidate->scratch_source))
            page = candidate->page;
    }

    g_return_val_if_fail (GTK_IS_BOX (page), NULL);

    return page;
}

const gchar *
e_source_config_get_backend_extension_name (ESourceConfig *config)
{
    ESourceConfigClass *class;

    g_return_val_if_fail (E_IS_SOURCE_CONFIG (config), NULL);

    class = E_SOURCE_CONFIG_GET_CLASS (config);
    g_return_val_if_fail (class->get_backend_extension_name != NULL, NULL);

    return class->get_backend_extension_name (config);
}

GList *
e_source_config_list_eligible_collections (ESourceConfig *config)
{
    ESourceConfigClass *class;

    g_return_val_if_fail (E_IS_SOURCE_CONFIG (config), NULL);

    class = E_SOURCE_CONFIG_GET_CLASS (config);
    g_return_val_if_fail (class->list_eligible_collections != NULL, NULL);

    return class->list_eligible_collections (config);
}

gboolean
e_source_config_check_complete (ESourceConfig *config)
{
    Candidate *candidate;
    gboolean complete;

    g_return_val_if_fail (E_IS_SOURCE_CONFIG (config), FALSE);

    candidate = source_config_get_active_candidate (config);
    g_return_val_if_fail (candidate != NULL, FALSE);

    g_signal_emit (
        config, signals[CHECK_COMPLETE], 0,
        candidate->scratch_source, &complete);

    complete &= e_source_config_backend_check_complete (
        candidate->backend, candidate->scratch_source);

    /* XXX Emitting "notify::complete" may cause this function
     *     to be called repeatedly by signal handlers.  The IF
     *     check below should break any recursive cycles.  Not
     *     very efficient but I think we can live with it. */

    if (complete != config->priv->complete) {
        config->priv->complete = complete;
        g_object_notify (G_OBJECT (config), "complete");
    }

    return complete;
}

ESource *
e_source_config_get_original_source (ESourceConfig *config)
{
    g_return_val_if_fail (E_IS_SOURCE_CONFIG (config), NULL);

    return config->priv->original_source;
}

ESource *
e_source_config_get_collection_source (ESourceConfig *config)
{
    g_return_val_if_fail (E_IS_SOURCE_CONFIG (config), NULL);

    return config->priv->collection_source;
}

ESourceRegistry *
e_source_config_get_registry (ESourceConfig *config)
{
    g_return_val_if_fail (E_IS_SOURCE_CONFIG (config), NULL);

    return config->priv->registry;
}

void
e_source_config_resize_window (ESourceConfig *config)
{
    g_return_if_fail (E_IS_SOURCE_CONFIG (config));

    g_signal_emit (config, signals[RESIZE_WINDOW], 0);
}

/* Helper for e_source_config_commit() */
static void
source_config_commit_cb (GObject *object,
                         GAsyncResult *result,
                         gpointer user_data)
{
    GSimpleAsyncResult *simple;
    GError *error = NULL;

    simple = G_SIMPLE_ASYNC_RESULT (user_data);

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

    if (error != NULL)
        g_simple_async_result_take_error (simple, error);

    g_simple_async_result_complete (simple);
    g_object_unref (simple);
}

void
e_source_config_commit (ESourceConfig *config,
                        GCancellable *cancellable,
                        GAsyncReadyCallback callback,
                        gpointer user_data)
{
    GSimpleAsyncResult *simple;
    ESourceRegistry *registry;
    Candidate *candidate;

    g_return_if_fail (E_IS_SOURCE_CONFIG (config));

    registry = e_source_config_get_registry (config);

    candidate = source_config_get_active_candidate (config);
    g_return_if_fail (candidate != NULL);

    e_source_config_backend_commit_changes (
        candidate->backend, candidate->scratch_source);

    g_signal_emit (
        config, signals[COMMIT_CHANGES], 0,
        candidate->scratch_source);

    simple = g_simple_async_result_new (
        G_OBJECT (config), callback,
        user_data, e_source_config_commit);

    e_source_registry_commit_source (
        registry, candidate->scratch_source,
        cancellable, source_config_commit_cb, simple);
}

gboolean
e_source_config_commit_finish (ESourceConfig *config,
                               GAsyncResult *result,
                               GError **error)
{
    GSimpleAsyncResult *simple;

    g_return_val_if_fail (
        g_simple_async_result_is_valid (
        result, G_OBJECT (config),
        e_source_config_commit), FALSE);

    simple = G_SIMPLE_ASYNC_RESULT (result);

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

void
e_source_config_add_refresh_interval (ESourceConfig *config,
                                      ESource *scratch_source)
{
    GtkWidget *widget;
    GtkWidget *container;
    ESourceExtension *extension;
    const gchar *extension_name;

    g_return_if_fail (E_IS_SOURCE_CONFIG (config));
    g_return_if_fail (E_IS_SOURCE (scratch_source));

    extension_name = E_SOURCE_EXTENSION_REFRESH;
    extension = e_source_get_extension (scratch_source, extension_name);

    widget = gtk_alignment_new (0.0, 0.5, 0.0, 0.0);
    e_source_config_insert_widget (config, scratch_source, NULL, widget);
    gtk_widget_show (widget);

    container = widget;

    widget = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
    gtk_container_add (GTK_CONTAINER (container), widget);
    gtk_widget_show (widget);

    container = widget;

    /* Translators: This is the first of a sequence of widgets:
     * "Refresh every [NUMERIC_ENTRY] [TIME_UNITS_COMBO]" */
    widget = gtk_label_new (_("Refresh every"));
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

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

    g_object_bind_property (
        extension, "interval-minutes",
        widget, "interval-minutes",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE);
}

void
e_source_config_add_secure_connection (ESourceConfig *config,
                                       ESource *scratch_source)
{
    GtkWidget *widget;
    ESourceExtension *extension;
    const gchar *extension_name;
    const gchar *label;

    g_return_if_fail (E_IS_SOURCE_CONFIG (config));
    g_return_if_fail (E_IS_SOURCE (scratch_source));

    extension_name = E_SOURCE_EXTENSION_SECURITY;
    extension = e_source_get_extension (scratch_source, extension_name);

    label = _("Use a secure connection");
    widget = gtk_check_button_new_with_label (label);
    e_source_config_insert_widget (config, scratch_source, NULL, widget);
    gtk_widget_show (widget);

    g_object_bind_property (
        extension, "secure",
        widget, "active",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE);
}

static gboolean
secure_to_port_cb (GBinding *binding,
                   const GValue *source_value,
                   GValue *target_value,
                   gpointer user_data)
{
    GObject *authentication_extension;
    guint16 port;

    authentication_extension = g_binding_get_target (binding);

    port = e_source_authentication_get_port (
        E_SOURCE_AUTHENTICATION (authentication_extension));

    if (port == 80 || port == 443 || port == 0)
        port = g_value_get_boolean (source_value) ? 443 : 80;

    g_value_set_uint (target_value, port);

    return TRUE;
}

static gboolean
webdav_source_ssl_trust_to_sensitive_cb (GBinding *binding,
                                         const GValue *source_value,
                                         GValue *target_value,
                                         gpointer user_data)
{
    const gchar *ssl_trust = g_value_get_string (source_value);

    g_value_set_boolean (target_value, ssl_trust && *ssl_trust);

    return TRUE;
}

static void
webdav_unset_ssl_trust_clicked_cb (GtkWidget *button,
                                   ESourceWebdav *extension)
{
    e_source_webdav_set_ssl_trust (extension, NULL);
}

void
e_source_config_add_secure_connection_for_webdav (ESourceConfig *config,
                                                  ESource *scratch_source)
{
    GtkWidget *widget;
    ESourceExtension *extension;
    ESourceAuthentication *authentication_extension;
    const gchar *extension_name;
    const gchar *label;

    g_return_if_fail (E_IS_SOURCE_CONFIG (config));
    g_return_if_fail (E_IS_SOURCE (scratch_source));

    extension_name = E_SOURCE_EXTENSION_SECURITY;
    extension = e_source_get_extension (scratch_source, extension_name);

    label = _("Use a secure connection");
    widget = gtk_check_button_new_with_label (label);
    e_source_config_insert_widget (config, scratch_source, NULL, widget);
    gtk_widget_show (widget);

    g_object_bind_property (
        extension, "secure",
        widget, "active",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE);

    extension_name = E_SOURCE_EXTENSION_AUTHENTICATION;
    authentication_extension =
        e_source_get_extension (scratch_source, extension_name);

    g_object_bind_property_full (
        extension, "secure",
        authentication_extension, "port",
        G_BINDING_DEFAULT,
        secure_to_port_cb,
        NULL, NULL, NULL);

    extension_name = E_SOURCE_EXTENSION_WEBDAV_BACKEND;
    extension = e_source_get_extension (scratch_source, extension_name);

    widget = gtk_button_new_with_mnemonic (
        _("Unset _trust for SSL certificate"));
    gtk_widget_set_margin_left (widget, 24);
    e_source_config_insert_widget (config, scratch_source, NULL, widget);
    gtk_widget_show (widget);

    g_object_bind_property_full (
        extension, "ssl-trust",
        widget, "sensitive",
        G_BINDING_SYNC_CREATE,
        webdav_source_ssl_trust_to_sensitive_cb,
        NULL, NULL, NULL);

    g_signal_connect (
        widget, "clicked",
        G_CALLBACK (webdav_unset_ssl_trust_clicked_cb), extension);
}

void
e_source_config_add_user_entry (ESourceConfig *config,
                                ESource *scratch_source)
{
    GtkWidget *widget;
    ESource *original_source;
    ESourceExtension *extension;
    const gchar *extension_name;

    g_return_if_fail (E_IS_SOURCE_CONFIG (config));
    g_return_if_fail (E_IS_SOURCE (scratch_source));

    extension_name = E_SOURCE_EXTENSION_AUTHENTICATION;
    extension = e_source_get_extension (scratch_source, extension_name);

    original_source = e_source_config_get_original_source (config);

    widget = gtk_entry_new ();
    e_source_config_insert_widget (
        config, scratch_source, _("User"), widget);
    gtk_widget_show (widget);

    g_object_bind_property (
        extension, "user",
        widget, "text",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE);

    /* If this is a new data source, initialize the
     * GtkEntry to the user name of the current user. */
    if (original_source == NULL)
        gtk_entry_set_text (GTK_ENTRY (widget), g_get_user_name ());
}