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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* evolution-shell-component.c
 *
 * Copyright (C) 2000, 2001 Ximian, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Author: Ettore Perazzoli
 */

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

#include "evolution-shell-component.h"

#include <fcntl.h>

#include <glib.h>
#include <gtk/gtksignal.h>
#include <bonobo/bonobo-object.h>

#include <gal/util/e-util.h>

#include "Evolution.h"


#define PARENT_TYPE BONOBO_X_OBJECT_TYPE

static GtkObjectClass *parent_class = NULL;

struct _EvolutionShellComponentPrivate {
    GList *folder_types;    /* EvolutionShellComponentFolderType */
    GList *external_uri_schemas; /* char * */

    EvolutionShellComponentCreateViewFn create_view_fn;
    EvolutionShellComponentCreateFolderFn create_folder_fn;
    EvolutionShellComponentRemoveFolderFn remove_folder_fn;
    EvolutionShellComponentXferFolderFn xfer_folder_fn;
    EvolutionShellComponentPopulateFolderContextMenuFn populate_folder_context_menu_fn;
    EvolutionShellComponentGetDndSelectionFn get_dnd_selection_fn;

    EvolutionShellClient *owner_client;

    void *closure;
};

enum {
    OWNER_SET,
    OWNER_UNSET,
    DEBUG,
    HANDLE_EXTERNAL_URI,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };


/* Helper functions.  */

/* Notice that, if passed a NULL pointer, this string will construct a
   zero-element NULL-terminated string array instead of returning NULL itself
   (i.e. it will return a pointer to a single g_malloc()ed NULL pointer).  */
static char **
duplicate_null_terminated_string_array (char *array[])
{
    char **new;
    int count;
    int i;

    if (array == NULL) {
        count = 0;
    } else {
        for (count = 0; array[count] != NULL; count++)
            ;
    }

    new = g_new (char *, count + 1);

    for (i = 0; i < count; i++)
        new[i] = g_strdup (array[i]);
    new[count] = NULL;

    return new;
}

/* The following will create a CORBA sequence of strings from the specified
 * NULL-terminated array, without duplicating the strings.  */
static void
fill_corba_sequence_from_null_terminated_string_array (CORBA_sequence_CORBA_string *corba_sequence,
                               char **array)
{
    int count;
    int i;

    g_assert (corba_sequence != NULL);
    g_assert (array != NULL);

    /* We won't be reallocating the strings, so we don't want them to be
       freed when the sequence is freed.  */
    CORBA_sequence_set_release (corba_sequence, FALSE);

    count = 0;
    while (array[count] != NULL)
        count++;

    corba_sequence->_maximum = count;
    corba_sequence->_length = count;
    corba_sequence->_buffer = CORBA_sequence_CORBA_string_allocbuf (count);

    for (i = 0; i < count; i++)
        corba_sequence->_buffer[i] = (CORBA_char *) array[i];
}


/* CORBA interface implementation.  */

static GNOME_Evolution_FolderTypeList *
impl_ShellComponent__get_supported_types (PortableServer_Servant servant,
                      CORBA_Environment *ev)
{
    BonoboObject *bonobo_object;
    EvolutionShellComponent *shell_component;
    EvolutionShellComponentPrivate *priv;
    GNOME_Evolution_FolderTypeList *folder_type_list;
    unsigned int i;
    GList *p;

    bonobo_object = bonobo_object_from_servant (servant);
    shell_component = EVOLUTION_SHELL_COMPONENT (bonobo_object);
    priv = shell_component->priv;

    folder_type_list = GNOME_Evolution_FolderTypeList__alloc ();
    CORBA_sequence_set_release (folder_type_list, TRUE);
    folder_type_list->_length = g_list_length (priv->folder_types);
    folder_type_list->_maximum = folder_type_list->_length;
    folder_type_list->_buffer = CORBA_sequence_GNOME_Evolution_FolderType_allocbuf (folder_type_list->_maximum);

    for (p = priv->folder_types, i = 0; p != NULL; p = p->next, i++) {
        GNOME_Evolution_FolderType *corba_folder_type;
        EvolutionShellComponentFolderType *folder_type;

        folder_type = (EvolutionShellComponentFolderType *) p->data;

        corba_folder_type = folder_type_list->_buffer + i;
        corba_folder_type->name      = CORBA_string_dup (folder_type->name);
        corba_folder_type->icon_name = CORBA_string_dup (folder_type->icon_name);

        fill_corba_sequence_from_null_terminated_string_array (& corba_folder_type->accepted_dnd_types,
                                       folder_type->accepted_dnd_types);
        fill_corba_sequence_from_null_terminated_string_array (& corba_folder_type->exported_dnd_types,
                                       folder_type->exported_dnd_types);
    }

    return folder_type_list;
}

static GNOME_Evolution_URISchemaList *
impl_ShellComponent__get_external_uri_schemas (PortableServer_Servant servant,
                           CORBA_Environment *ev)
{
    EvolutionShellComponent *shell_component;
    EvolutionShellComponentPrivate *priv;
    GNOME_Evolution_URISchemaList *uri_schema_list;
    GList *p;
    int i;

    shell_component = EVOLUTION_SHELL_COMPONENT (bonobo_object_from_servant (servant));
    priv = shell_component->priv;

    uri_schema_list = GNOME_Evolution_URISchemaList__alloc ();

    /* FIXME: We could probably keep this to FALSE and avoid
       CORBA_string_duplicating.  */
    CORBA_sequence_set_release (uri_schema_list, TRUE);

    if (priv->external_uri_schemas == NULL) {
        uri_schema_list->_length = 0;
        uri_schema_list->_maximum = 0;
        uri_schema_list->_buffer = NULL;
        return uri_schema_list;
    }

    uri_schema_list->_length = g_list_length (priv->external_uri_schemas);
    uri_schema_list->_maximum = uri_schema_list->_length;
    uri_schema_list->_buffer = CORBA_sequence_GNOME_Evolution_URISchema_allocbuf (uri_schema_list->_maximum);

    for (p = priv->external_uri_schemas, i = 0; p != NULL; p = p->next, i++) {
        const char *schema;

        schema = (const char *) p->data;
        uri_schema_list->_buffer[i] = CORBA_string_dup (schema);
    }

    return uri_schema_list;
}

static void
impl_ShellComponent_set_owner (PortableServer_Servant servant,
                   const GNOME_Evolution_Shell shell,
                   const CORBA_char *evolution_homedir,
                   CORBA_Environment *ev)
{
    BonoboObject *bonobo_object;
    EvolutionShellComponent *shell_component;
    EvolutionShellComponentPrivate *priv;
    GNOME_Evolution_Shell shell_duplicate;

    bonobo_object = bonobo_object_from_servant (servant);
    shell_component = EVOLUTION_SHELL_COMPONENT (bonobo_object);
    priv = shell_component->priv;

    if (priv->owner_client != NULL) {
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                     ex_GNOME_Evolution_ShellComponent_AlreadyOwned, NULL);
        return;
    }

    shell_duplicate = CORBA_Object_duplicate (shell, ev);

    if (ev->_major == CORBA_NO_EXCEPTION) {
        priv->owner_client = evolution_shell_client_new (shell_duplicate);
        gtk_signal_emit (GTK_OBJECT (shell_component), signals[OWNER_SET], priv->owner_client, evolution_homedir);
    }
}

static void
impl_ShellComponent_unset_owner (PortableServer_Servant servant,
                 CORBA_Environment *ev)
{
    BonoboObject *bonobo_object;
    EvolutionShellComponent *shell_component;
    EvolutionShellComponentPrivate *priv;

    bonobo_object = bonobo_object_from_servant (servant);
    shell_component = EVOLUTION_SHELL_COMPONENT (bonobo_object);
    priv = shell_component->priv;

    if (priv->owner_client == NULL) {
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                     ex_GNOME_Evolution_ShellComponent_NotOwned, NULL);
        return;
    }

    bonobo_object_unref (BONOBO_OBJECT (priv->owner_client));
    priv->owner_client = NULL;

    gtk_signal_emit (GTK_OBJECT (shell_component), signals[OWNER_UNSET]);
}

static void
impl_ShellComponent_debug (PortableServer_Servant servant,
               const CORBA_char *log_path,
               CORBA_Environment *ev)
{
    BonoboObject *bonobo_object;
    EvolutionShellComponent *shell_component;
    int fd;

    bonobo_object = bonobo_object_from_servant (servant);
    shell_component = EVOLUTION_SHELL_COMPONENT (bonobo_object);

    fd = open (log_path, O_WRONLY | O_APPEND);
    if (!fd)
        return;

    dup2 (fd, STDOUT_FILENO);
    dup2 (fd, STDERR_FILENO);
    close (fd);

    gtk_signal_emit (GTK_OBJECT (shell_component), signals[DEBUG]);
}

static Bonobo_Control
impl_ShellComponent_create_view (PortableServer_Servant servant,
                 const CORBA_char *physical_uri,
                 const CORBA_char *type,
                 CORBA_Environment *ev)
{
    BonoboObject *bonobo_object;
    EvolutionShellComponent *shell_component;
    EvolutionShellComponentPrivate *priv;
    EvolutionShellComponentResult result;
    BonoboControl *control;

    bonobo_object = bonobo_object_from_servant (servant);
    shell_component = EVOLUTION_SHELL_COMPONENT (bonobo_object);
    priv = shell_component->priv;

    result = (* priv->create_view_fn) (shell_component, physical_uri, type,
                       &control, priv->closure);

    if (result != EVOLUTION_SHELL_COMPONENT_OK) {
        switch (result) {
        case EVOLUTION_SHELL_COMPONENT_UNSUPPORTEDTYPE:
            CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                         ex_GNOME_Evolution_ShellComponent_UnsupportedType,
                         NULL);
            break;
        case EVOLUTION_SHELL_COMPONENT_INTERNALERROR:
            CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                         ex_GNOME_Evolution_ShellComponent_InternalError,
                         NULL);
            break;
        default:
            CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                         ex_GNOME_Evolution_ShellComponent_NotFound,
                         NULL);
        }

        return CORBA_OBJECT_NIL;
    }

    return CORBA_Object_duplicate (bonobo_object_corba_objref (BONOBO_OBJECT (control)), ev);
}

static void
impl_ShellComponent_async_create_folder (PortableServer_Servant servant,
                     const GNOME_Evolution_ShellComponentListener listener,
                     const CORBA_char *physical_uri,
                     const CORBA_char *type,
                     CORBA_Environment *ev)
{
    BonoboObject *bonobo_object;
    EvolutionShellComponent *shell_component;
    EvolutionShellComponentPrivate *priv;

    bonobo_object = bonobo_object_from_servant (servant);
    shell_component = EVOLUTION_SHELL_COMPONENT (bonobo_object);
    priv = shell_component->priv;

    if (priv->create_folder_fn == NULL) {
        GNOME_Evolution_ShellComponentListener_notifyResult (listener,
                                     GNOME_Evolution_ShellComponentListener_UNSUPPORTED_OPERATION,
                                     ev);
        return;
    }

    (* priv->create_folder_fn) (shell_component, physical_uri, type, listener, priv->closure);
}

static void
impl_ShellComponent_async_remove_folder (PortableServer_Servant servant,
                     const GNOME_Evolution_ShellComponentListener listener,
                     const CORBA_char *physical_uri,
                     CORBA_Environment *ev)
{
    BonoboObject *bonobo_object;
    EvolutionShellComponent *shell_component;
    EvolutionShellComponentPrivate *priv;

    bonobo_object = bonobo_object_from_servant (servant);
    shell_component = EVOLUTION_SHELL_COMPONENT (bonobo_object);
    priv = shell_component->priv;

    if (priv->remove_folder_fn == NULL) {
        GNOME_Evolution_ShellComponentListener_notifyResult (listener,
                                     GNOME_Evolution_ShellComponentListener_UNSUPPORTED_OPERATION,
                                     ev);
        return;
    }

    (* priv->remove_folder_fn) (shell_component, physical_uri, listener, priv->closure);
}

static void
impl_ShellComponent_async_xfer_folder (PortableServer_Servant servant,
                       const GNOME_Evolution_ShellComponentListener listener,
                       const CORBA_char *source_physical_uri,
                       const CORBA_char *destination_physical_uri,
                       const CORBA_boolean remove_source,
                       CORBA_Environment *ev)
{
    BonoboObject *bonobo_object;
    EvolutionShellComponent *shell_component;
    EvolutionShellComponentPrivate *priv;

    bonobo_object = bonobo_object_from_servant (servant);
    shell_component = EVOLUTION_SHELL_COMPONENT (bonobo_object);
    priv = shell_component->priv;

    if (priv->xfer_folder_fn == NULL) {
        GNOME_Evolution_ShellComponentListener_notifyResult (listener,
                                     GNOME_Evolution_ShellComponentListener_UNSUPPORTED_OPERATION,
                                     ev);
        return;
    }

    (* priv->xfer_folder_fn) (shell_component,
                  source_physical_uri,
                  destination_physical_uri,
                  remove_source,
                  listener,
                  priv->closure);
}

static void
impl_ShellComponent_populate_folder_context_menu (PortableServer_Servant servant,
                          const Bonobo_UIContainer corba_uih,
                          const CORBA_char *physical_uri,
                          const CORBA_char *type,
                          CORBA_Environment *ev)
{
    BonoboObject *bonobo_object;
    EvolutionShellComponent *shell_component;
    EvolutionShellComponentPrivate *priv;
    BonoboUIComponent *uic;

    bonobo_object = bonobo_object_from_servant (servant);
    shell_component = EVOLUTION_SHELL_COMPONENT (bonobo_object);
    priv = shell_component->priv;

    if (priv->populate_folder_context_menu_fn == NULL)
        return;

    uic = bonobo_ui_component_new_default ();
    bonobo_ui_component_set_container (uic, corba_uih);
    bonobo_object_release_unref (corba_uih, NULL);

    (* priv->populate_folder_context_menu_fn) (shell_component, uic, physical_uri, type, priv->closure);

    bonobo_object_unref (BONOBO_OBJECT (uic));
}


/* GtkObject methods.  */

static void
destroy (GtkObject *object)
{
    EvolutionShellComponent *shell_component;
    EvolutionShellComponentPrivate *priv;
    CORBA_Environment ev;
    GList *p;

    shell_component = EVOLUTION_SHELL_COMPONENT (object);

    priv = shell_component->priv;

    CORBA_exception_init (&ev);

    if (priv->owner_client != NULL)
        bonobo_object_unref (BONOBO_OBJECT (priv->owner_client));

    CORBA_exception_free (&ev);

    for (p = priv->folder_types; p != NULL; p = p->next) {
        EvolutionShellComponentFolderType *folder_type;

        folder_type = (EvolutionShellComponentFolderType *) p->data;

        g_free (folder_type->name);
        g_free (folder_type->icon_name);
        g_strfreev (folder_type->exported_dnd_types);
        g_strfreev (folder_type->accepted_dnd_types);

        g_free (folder_type);
    }
    g_list_free (priv->folder_types);

    e_free_string_list (priv->external_uri_schemas);

    g_free (priv);

    parent_class->destroy (object);
}


/* Initialization.  */

static void
class_init (EvolutionShellComponentClass *klass)
{
    GtkObjectClass *object_class;
    POA_GNOME_Evolution_ShellComponent__epv *epv = &klass->epv;

    object_class = GTK_OBJECT_CLASS (klass);
    object_class->destroy = destroy;

    signals[OWNER_SET]
        = gtk_signal_new ("owner_set",
                  GTK_RUN_FIRST,
                  object_class->type,
                  GTK_SIGNAL_OFFSET (EvolutionShellComponentClass, owner_set),
                  gtk_marshal_NONE__POINTER_POINTER,
                  GTK_TYPE_NONE, 2,
                  GTK_TYPE_POINTER, GTK_TYPE_POINTER);

    signals[OWNER_UNSET]
        = gtk_signal_new ("owner_unset",
                  GTK_RUN_FIRST,
                  object_class->type,
                  GTK_SIGNAL_OFFSET (EvolutionShellComponentClass, owner_unset),
                  gtk_marshal_NONE__NONE,
                  GTK_TYPE_NONE, 0);

    signals[DEBUG]
        = gtk_signal_new ("debug",
                  GTK_RUN_FIRST,
                  object_class->type,
                  GTK_SIGNAL_OFFSET (EvolutionShellComponentClass, debug),
                  gtk_marshal_NONE__NONE,
                  GTK_TYPE_NONE, 0);

    signals[HANDLE_EXTERNAL_URI]
        = gtk_signal_new ("handle_external_uri",
                  GTK_RUN_FIRST,
                  object_class->type,
                  GTK_SIGNAL_OFFSET (EvolutionShellComponentClass, handle_external_uri),
                  gtk_marshal_NONE__STRING,
                  GTK_TYPE_NONE, 1,
                  GTK_TYPE_STRING);

    gtk_object_class_add_signals (object_class, signals, LAST_SIGNAL);

    parent_class = gtk_type_class (PARENT_TYPE);

    epv->_get_supported_types      = impl_ShellComponent__get_supported_types;
    epv->_get_external_uri_schemas = impl_ShellComponent__get_external_uri_schemas;
    epv->setOwner                  = impl_ShellComponent_set_owner;
    epv->unsetOwner                = impl_ShellComponent_unset_owner;
    epv->debug                     = impl_ShellComponent_debug;
    epv->createView                = impl_ShellComponent_create_view;
    epv->createFolderAsync         = impl_ShellComponent_async_create_folder;
    epv->removeFolderAsync         = impl_ShellComponent_async_remove_folder;
    epv->xferFolderAsync           = impl_ShellComponent_async_xfer_folder;
    epv->populateFolderContextMenu = impl_ShellComponent_populate_folder_context_menu;
}

static void
init (EvolutionShellComponent *shell_component)
{
    EvolutionShellComponentPrivate *priv;

    priv = g_new (EvolutionShellComponentPrivate, 1);

    priv->folder_types                    = NULL;
    priv->external_uri_schemas            = NULL;

    priv->create_view_fn                  = NULL;
    priv->create_folder_fn                = NULL;
    priv->remove_folder_fn                = NULL;
    priv->xfer_folder_fn                  = NULL;
    priv->populate_folder_context_menu_fn = NULL;

    priv->owner_client                    = NULL;
    priv->closure                         = NULL;

    shell_component->priv = priv;
}


void
evolution_shell_component_construct (EvolutionShellComponent *shell_component,
                     const EvolutionShellComponentFolderType folder_types[],
                     const char *external_uri_schemas[],
                     EvolutionShellComponentCreateViewFn create_view_fn,
                     EvolutionShellComponentCreateFolderFn create_folder_fn,
                     EvolutionShellComponentRemoveFolderFn remove_folder_fn,
                     EvolutionShellComponentXferFolderFn xfer_folder_fn,
                     EvolutionShellComponentPopulateFolderContextMenuFn populate_folder_context_menu_fn,
                     EvolutionShellComponentGetDndSelectionFn get_dnd_selection_fn,
                     void *closure)
{
    EvolutionShellComponentPrivate *priv;
    int i;

    g_return_if_fail (shell_component != NULL);
    g_return_if_fail (EVOLUTION_IS_SHELL_COMPONENT (shell_component));
    g_return_if_fail (folder_types != NULL);

    priv = shell_component->priv;

    priv->create_view_fn                  = create_view_fn;
    priv->create_folder_fn                = create_folder_fn;
    priv->remove_folder_fn                = remove_folder_fn;
    priv->xfer_folder_fn                  = xfer_folder_fn;
    priv->populate_folder_context_menu_fn = populate_folder_context_menu_fn;
    priv->get_dnd_selection_fn            = get_dnd_selection_fn;

    priv->closure = closure;

    for (i = 0; folder_types[i].name != NULL; i++) {
        EvolutionShellComponentFolderType *new;

        if (folder_types[i].icon_name == NULL
            || folder_types[i].name[0] == '\0'
            || folder_types[i].icon_name[0] == '\0')
            continue;

        new = g_new (EvolutionShellComponentFolderType, 1);
        new->name               = g_strdup (folder_types[i].name);
        new->icon_name          = g_strdup (folder_types[i].icon_name);
        new->accepted_dnd_types = duplicate_null_terminated_string_array (folder_types[i].accepted_dnd_types);
        new->exported_dnd_types = duplicate_null_terminated_string_array (folder_types[i].exported_dnd_types);

        priv->folder_types = g_list_prepend (priv->folder_types, new);
    }

    if (priv->folder_types == NULL)
        g_warning ("No valid folder types constructing EShellComponent %p", shell_component);

    if (external_uri_schemas != NULL) {
        for (i = 0; external_uri_schemas[i] != NULL; i++)
            priv->external_uri_schemas = g_list_prepend (priv->external_uri_schemas,
                                     g_strdup (external_uri_schemas[i]));
    }
}

EvolutionShellComponent *
evolution_shell_component_new (const EvolutionShellComponentFolderType folder_types[],
                   const char *external_uri_schemas[],
                   EvolutionShellComponentCreateViewFn create_view_fn,
                   EvolutionShellComponentCreateFolderFn create_folder_fn,
                   EvolutionShellComponentRemoveFolderFn remove_folder_fn,
                   EvolutionShellComponentXferFolderFn xfer_folder_fn,
                   EvolutionShellComponentPopulateFolderContextMenuFn populate_folder_context_menu_fn,
                   EvolutionShellComponentGetDndSelectionFn get_dnd_selection_fn,
                   void *closure)
{
    EvolutionShellComponent *new;

    g_return_val_if_fail (folder_types != NULL, NULL);

    new = gtk_type_new (evolution_shell_component_get_type ());

    evolution_shell_component_construct (new,
                         folder_types,
                         external_uri_schemas,
                         create_view_fn,
                         create_folder_fn,
                         remove_folder_fn,
                         xfer_folder_fn,
                         populate_folder_context_menu_fn,
                         get_dnd_selection_fn,
                         closure);

    return new;
}

EvolutionShellClient *
evolution_shell_component_get_owner  (EvolutionShellComponent *shell_component)
{
    g_return_val_if_fail (shell_component != NULL, NULL);
    g_return_val_if_fail (EVOLUTION_IS_SHELL_COMPONENT (shell_component), NULL);

    return shell_component->priv->owner_client;
}


E_MAKE_X_TYPE (evolution_shell_component, "EvolutionShellComponent", EvolutionShellComponent,
           class_init, init, PARENT_TYPE,
           POA_GNOME_Evolution_ShellComponent__init,
           GTK_STRUCT_OFFSET (EvolutionShellComponentClass, epv));