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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-storage.c
 *
 * Copyright (C) 2000, 2001 Ximian, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Author: Ettore Perazzoli
 */

/* FIXME: The EFolderTree is kept both in the EStorage and the
 * EvolutionStorage.  Bad design.
 */

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

#include "e-storage.h"

#include "e-folder-tree.h"
#include "e-shell-constants.h"
#include "e-shell-marshal.h"

#include <gtk/gtkobject.h>
#include <gtk/gtksignal.h>

#include <libgnome/gnome-i18n.h>
#include <gal/util/e-util.h>

#include <string.h>


#define PARENT_TYPE GTK_TYPE_OBJECT
static GtkObjectClass *parent_class = NULL;

#define ES_CLASS(obj) \
    E_STORAGE_CLASS (GTK_OBJECT_GET_CLASS (obj))

struct _EStoragePrivate {
    /* The set of folders we have in this storage.  */
    EFolderTree *folder_tree;

    /* The pseudofolders representing un-filled-in subtrees */
    GHashTable *pseudofolders;

    /* Internal name of the storage */
    char *name;
};

enum {
    NEW_FOLDER,
    UPDATED_FOLDER,
    REMOVED_FOLDER,
    CLOSE_FOLDER,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };


/* Destroy notification function for the folders in the tree.  */

static void
folder_destroy_notify (EFolderTree *tree,
               const char *path,
               void *data,
               void *closure)
{
    EFolder *e_folder;

    if (data == NULL) {
        /* The root folder has no EFolder associated to it.  */
        return;
    }

    e_folder = E_FOLDER (data);
    g_object_unref (e_folder);
}


/* Signal callbacks for the EFolders.  */

static void
folder_changed_cb (EFolder *folder,
           void *data)
{
    EStorage *storage;
    EStoragePrivate *priv;
    const char *path, *p;
    gboolean highlight;

    g_assert (E_IS_STORAGE (data));

    storage = E_STORAGE (data);
    priv = storage->priv;

    path = e_folder_tree_get_path_for_data (priv->folder_tree, folder);
    g_assert (path != NULL);

    g_signal_emit (storage, signals[UPDATED_FOLDER], 0, path);

    highlight = GPOINTER_TO_INT (gtk_object_get_data (GTK_OBJECT (folder), "last_highlight"));
    if (highlight != e_folder_get_highlighted (folder)) {
        highlight = !highlight;
        g_object_set_data (G_OBJECT (folder), "last_highlight", GINT_TO_POINTER (highlight));
        p = strrchr (path, '/');
        if (p && p != path) {
            char *name;
            
            name = g_strndup (path, p - path);
            folder = e_folder_tree_get_folder (priv->folder_tree, name);
            g_free (name);
            if (folder)
                e_folder_set_child_highlight (folder, highlight);
        }
    }
}


/* GtkObject methods.  */

static void
free_folder (gpointer path, gpointer folder, gpointer user_data)
{
    g_free (path);
    /* folders will have been freed by e_folder_tree_destroy */
}

static void
destroy (GtkObject *object)
{
    EStorage *storage;
    EStoragePrivate *priv;

    storage = E_STORAGE (object);
    priv = storage->priv;

    if (priv->folder_tree != NULL)
        e_folder_tree_destroy (priv->folder_tree);
    if (priv->pseudofolders) {
        g_hash_table_foreach (priv->pseudofolders, free_folder, NULL);
        g_hash_table_destroy (priv->pseudofolders);
    }

    g_free (priv->name);

    (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}


/* EStorage methods.  */

static GList *
impl_get_subfolder_paths (EStorage *storage,
              const char *path)
{
    EStoragePrivate *priv;

    priv = storage->priv;

    return e_folder_tree_get_subfolders (priv->folder_tree, path);
}

static EFolder *
impl_get_folder (EStorage *storage,
         const char *path)
{
    EStoragePrivate *priv;
    EFolder *e_folder;

    priv = storage->priv;

    e_folder = (EFolder *) e_folder_tree_get_folder (priv->folder_tree, path);

    return e_folder;
}

static const char *
impl_get_name (EStorage *storage)
{
    return storage->priv->name;
}

static void
impl_async_create_folder (EStorage *storage,
              const char *path,
              const char *type,
              const char *description,
              EStorageResultCallback callback,
              void *data)
{
    (* callback) (storage, E_STORAGE_NOTIMPLEMENTED, data);
}

static void
impl_async_remove_folder (EStorage *storage,
              const char *path,
              EStorageResultCallback callback,
              void *data)
{
    (* callback) (storage, E_STORAGE_NOTIMPLEMENTED, data);
}

static void
impl_async_xfer_folder (EStorage *storage,
            const char *source_path,
            const char *destination_path,
            gboolean remove_source,
            EStorageResultCallback callback,
            void *data)
{
    (* callback) (storage, E_STORAGE_NOTIMPLEMENTED, data);
}

static void
impl_async_open_folder (EStorage *storage,
            const char *path)
{
    ;
}

static gboolean
impl_supports_shared_folders (EStorage *storage)
{
    return FALSE;
}

static void
impl_async_discover_shared_folder (EStorage *storage,
                   const char *owner,
                   const char *folder_name,
                   EStorageDiscoveryCallback callback,
                   void *data)
{
    (* callback) (storage, E_STORAGE_NOTIMPLEMENTED, NULL, data);
}

static void
impl_async_remove_shared_folder (EStorage *storage,
                 const char *path,
                 EStorageResultCallback callback,
                 void *data)
{
    (* callback) (storage, E_STORAGE_NOTIMPLEMENTED, data);
}


/* Initialization.  */

static void
class_init (EStorageClass *class)
{
    GtkObjectClass *object_class;

    object_class = GTK_OBJECT_CLASS (class);
    parent_class = gtk_type_class (gtk_object_get_type ());

    object_class->destroy = destroy;

    class->get_subfolder_paths = impl_get_subfolder_paths;
    class->get_folder          = impl_get_folder;
    class->get_name            = impl_get_name;
    class->async_create_folder = impl_async_create_folder;
    class->async_remove_folder = impl_async_remove_folder;
    class->async_xfer_folder   = impl_async_xfer_folder;
    class->async_open_folder   = impl_async_open_folder;

    class->supports_shared_folders       = impl_supports_shared_folders;
    class->async_discover_shared_folder  = impl_async_discover_shared_folder;
    class->async_remove_shared_folder    = impl_async_remove_shared_folder;

    signals[NEW_FOLDER] =
        gtk_signal_new ("new_folder",
                GTK_RUN_FIRST,
                GTK_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (EStorageClass, new_folder),
                e_shell_marshal_NONE__STRING,
                GTK_TYPE_NONE, 1,
                GTK_TYPE_STRING);
    signals[UPDATED_FOLDER] =
        gtk_signal_new ("updated_folder",
                GTK_RUN_FIRST,
                GTK_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (EStorageClass, updated_folder),
                e_shell_marshal_NONE__STRING,
                GTK_TYPE_NONE, 1,
                GTK_TYPE_STRING);
    signals[REMOVED_FOLDER] =
        gtk_signal_new ("removed_folder",
                GTK_RUN_FIRST,
                GTK_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (EStorageClass, removed_folder),
                e_shell_marshal_NONE__STRING,
                GTK_TYPE_NONE, 1,
                GTK_TYPE_STRING);
    signals[CLOSE_FOLDER] =
        gtk_signal_new ("close_folder",
                GTK_RUN_FIRST,
                GTK_CLASS_TYPE (object_class),
                GTK_SIGNAL_OFFSET (EStorageClass, close_folder),
                e_shell_marshal_NONE__STRING,
                GTK_TYPE_NONE, 1,
                GTK_TYPE_STRING);
}

static void
init (EStorage *storage)
{
    EStoragePrivate *priv;

    priv = g_new (EStoragePrivate, 1);

    priv->folder_tree   = e_folder_tree_new (folder_destroy_notify, NULL);
    priv->pseudofolders = g_hash_table_new (g_str_hash, g_str_equal);
    priv->name          = NULL;

    storage->priv = priv;
}


/* Creation.  */

void
e_storage_construct (EStorage *storage,
             const char *name,
             EFolder *root_folder)
{
    EStoragePrivate *priv;

    g_return_if_fail (storage != NULL);
    g_return_if_fail (E_IS_STORAGE (storage));

    priv = storage->priv;

    priv->name               = g_strdup (name);

    e_storage_new_folder (storage, "/", root_folder);

    GTK_OBJECT_UNSET_FLAGS (GTK_OBJECT (storage), GTK_FLOATING);
}

EStorage *
e_storage_new (const char *name,
           EFolder *root_folder)
{
    EStorage *new;

    new = gtk_type_new (e_storage_get_type ());

    e_storage_construct (new, name, root_folder);

    return new;
}


gboolean
e_storage_path_is_absolute (const char *path)
{
    g_return_val_if_fail (path != NULL, FALSE);

    return *path == E_PATH_SEPARATOR;
}

gboolean
e_storage_path_is_relative (const char *path)
{
    g_return_val_if_fail (path != NULL, FALSE);

    return *path != E_PATH_SEPARATOR;
}


GList *
e_storage_get_subfolder_paths (EStorage *storage,
                   const char *path)
{
    g_return_val_if_fail (storage != NULL, NULL);
    g_return_val_if_fail (E_IS_STORAGE (storage), NULL);
    g_return_val_if_fail (path != NULL, NULL);
    g_return_val_if_fail (g_path_is_absolute (path), NULL);

    return (* ES_CLASS (storage)->get_subfolder_paths) (storage, path);
}

EFolder *
e_storage_get_folder (EStorage *storage,
              const char *path)
{
    g_return_val_if_fail (storage != NULL, NULL);
    g_return_val_if_fail (E_IS_STORAGE (storage), NULL);
    g_return_val_if_fail (path != NULL, NULL);
    g_return_val_if_fail (e_storage_path_is_absolute (path), NULL);

    return (* ES_CLASS (storage)->get_folder) (storage, path);
}

const char *
e_storage_get_name (EStorage *storage)
{
    g_return_val_if_fail (storage != NULL, NULL);
    g_return_val_if_fail (E_IS_STORAGE (storage), NULL);

    return (* ES_CLASS (storage)->get_name) (storage);
}


/* Folder operations.  */

void
e_storage_async_create_folder (EStorage *storage,
                   const char *path,
                   const char *type,
                   const char *description,
                   EStorageResultCallback callback,
                   void *data)
{
    g_return_if_fail (storage != NULL);
    g_return_if_fail (E_IS_STORAGE (storage));
    g_return_if_fail (path != NULL);
    g_return_if_fail (g_path_is_absolute (path));
    g_return_if_fail (type != NULL);
    g_return_if_fail (callback != NULL);

    (* ES_CLASS (storage)->async_create_folder) (storage, path, type, description, callback, data);
}

void
e_storage_async_remove_folder (EStorage              *storage,
                   const char            *path,
                   EStorageResultCallback callback,
                   void                  *data)
{
    g_return_if_fail (storage != NULL);
    g_return_if_fail (E_IS_STORAGE (storage));
    g_return_if_fail (path != NULL);
    g_return_if_fail (g_path_is_absolute (path));
    g_return_if_fail (callback != NULL);

    (* ES_CLASS (storage)->async_remove_folder) (storage, path, callback, data);
}

void
e_storage_async_xfer_folder (EStorage *storage,
                 const char *source_path,
                 const char *destination_path,
                 const gboolean remove_source,
                 EStorageResultCallback callback,
                 void *data)
{
    g_return_if_fail (storage != NULL);
    g_return_if_fail (E_IS_STORAGE (storage));
    g_return_if_fail (source_path != NULL);
    g_return_if_fail (g_path_is_absolute (source_path));
    g_return_if_fail (destination_path != NULL);
    g_return_if_fail (g_path_is_absolute (destination_path));

    if (strcmp (source_path, destination_path) == 0) {
        (* callback) (storage, E_STORAGE_OK, data);
        return;
    }

    if (remove_source) {
        int destination_len;
        int source_len;

        source_len = strlen (source_path);
        destination_len = strlen (destination_path);

        if (source_len < destination_len
            && destination_path[source_len] == E_PATH_SEPARATOR
            && strncmp (destination_path, source_path, source_len) == 0) {
            (* callback) (storage, E_STORAGE_CANTMOVETODESCENDANT, data);
            return;
        }
    }

    (* ES_CLASS (storage)->async_xfer_folder) (storage, source_path, destination_path, remove_source, callback, data);
}

void
e_storage_async_open_folder (EStorage *storage,
                 const char *path)
{
    g_return_if_fail (storage != NULL);
    g_return_if_fail (E_IS_STORAGE (storage));
    g_return_if_fail (path != NULL);
    g_return_if_fail (g_path_is_absolute (path));

    if (g_hash_table_lookup (storage->priv->pseudofolders, path) == NULL)
        return;

    (* ES_CLASS (storage)->async_open_folder) (storage, path);
}


/* Shared folders.  */

gboolean
e_storage_supports_shared_folders (EStorage *storage)
{
    g_return_val_if_fail (storage != NULL, FALSE);
    g_return_val_if_fail (E_IS_STORAGE (storage), FALSE);

    return (* ES_CLASS (storage)->supports_shared_folders) (storage);
}

void
e_storage_async_discover_shared_folder (EStorage *storage,
                    const char *owner,
                    const char *folder_name,
                    EStorageDiscoveryCallback callback,
                    void *data)
{
    g_return_if_fail (storage != NULL);
    g_return_if_fail (E_IS_STORAGE (storage));
    g_return_if_fail (owner != NULL);
    g_return_if_fail (folder_name != NULL);

    (* ES_CLASS (storage)->async_discover_shared_folder) (storage, owner, folder_name, callback, data);
}

void
e_storage_cancel_discover_shared_folder (EStorage *storage,
                     const char *owner,
                     const char *folder_name)
{
    g_return_if_fail (E_IS_STORAGE (storage));
    g_return_if_fail (owner != NULL);
    g_return_if_fail (folder_name != NULL);
    g_return_if_fail (ES_CLASS (storage)->cancel_discover_shared_folder != NULL);

    (* ES_CLASS (storage)->cancel_discover_shared_folder) (storage, owner, folder_name);
}

void
e_storage_async_remove_shared_folder (EStorage *storage,
                      const char *path,
                      EStorageResultCallback callback,
                      void *data)
{
    g_return_if_fail (storage != NULL);
    g_return_if_fail (E_IS_STORAGE (storage));
    g_return_if_fail (path != NULL);
    g_return_if_fail (g_path_is_absolute (path));

    (* ES_CLASS (storage)->async_remove_shared_folder) (storage, path, callback, data);
}


const char *
e_storage_result_to_string (EStorageResult result)
{
    switch (result) {
    case E_STORAGE_OK:
        return _("No error");
    case E_STORAGE_GENERICERROR:
        return _("Generic error");
    case E_STORAGE_EXISTS:
        return _("A folder with the same name already exists");
    case E_STORAGE_INVALIDTYPE:
        return _("The specified folder type is not valid");
    case E_STORAGE_IOERROR:
        return _("I/O error");
    case E_STORAGE_NOSPACE:
        return _("Not enough space to create the folder");
    case E_STORAGE_NOTEMPTY:
        return _("The folder is not empty");
    case E_STORAGE_NOTFOUND:
        return _("The specified folder was not found");
    case E_STORAGE_NOTIMPLEMENTED:
        return _("Function not implemented in this storage");
    case E_STORAGE_PERMISSIONDENIED:
        return _("Permission denied");
    case E_STORAGE_UNSUPPORTEDOPERATION:
        return _("Operation not supported");
    case E_STORAGE_UNSUPPORTEDTYPE:
        return _("The specified type is not supported in this storage");
    case E_STORAGE_CANTCHANGESTOCKFOLDER:
        return _("The specified folder cannot be modified or removed");
    case E_STORAGE_CANTMOVETODESCENDANT:
        return _("Cannot make a folder a child of one of its descendants");
    case E_STORAGE_INVALIDNAME:
        return _("Cannot create a folder with that name");
    case E_STORAGE_NOTONLINE:
        return _("This operation cannot be performed in off-line mode");
    default:
        return _("Unknown error");
    }
}


/* Public utility functions.  */

struct _GetPathForPhysicalUriForeachData {
    const char *physical_uri;
    char *retval;
};
typedef struct _GetPathForPhysicalUriForeachData GetPathForPhysicalUriForeachData;

static void
get_path_for_physical_uri_foreach (EFolderTree *folder_tree,
                   const char *path,
                   void *path_data,
                   void *user_data)
{
    GetPathForPhysicalUriForeachData *foreach_data;
    const char *physical_uri;
    EFolder *e_folder;

    foreach_data = (GetPathForPhysicalUriForeachData *) user_data;
    if (foreach_data->retval != NULL)
        return;

    e_folder = (EFolder *) path_data;
    if (e_folder == NULL)
        return;

    physical_uri = e_folder_get_physical_uri (e_folder);
    if (physical_uri == NULL)
        return;

    if (strcmp (foreach_data->physical_uri, physical_uri) == 0)
        foreach_data->retval = g_strdup (path);
}

/**
 * e_storage_get_path_for_physical_uri:
 * @storage: A storage
 * @physical_uri: A physical URI
 * 
 * Look for the folder having the specified @physical_uri.
 * 
 * Return value: The path of the folder having the specified @physical_uri in
 * @storage.  If such a folder does not exist, just return NULL.  The return
 * value must be freed by the caller.
 **/
char *
e_storage_get_path_for_physical_uri (EStorage *storage,
                     const char *physical_uri)
{
    GetPathForPhysicalUriForeachData foreach_data;
    EStoragePrivate *priv;

    g_return_val_if_fail (storage != NULL, NULL);
    g_return_val_if_fail (E_IS_STORAGE (storage), NULL);
    g_return_val_if_fail (physical_uri != NULL, NULL);

    priv = storage->priv;

    foreach_data.physical_uri = physical_uri;
    foreach_data.retval       = NULL;

    e_folder_tree_foreach (priv->folder_tree, get_path_for_physical_uri_foreach, &foreach_data);

    return foreach_data.retval;
}


/* Protected functions.  */

/* These functions are used by subclasses to add and remove folders from the
   state stored in the storage object.  */

gboolean
e_storage_new_folder (EStorage *storage,
              const char *path,
              EFolder *e_folder)
{
    EStoragePrivate *priv;
    char *parent_path, *p;
    gpointer stored_path, pseudofolder;

    g_return_val_if_fail (storage != NULL, FALSE);
    g_return_val_if_fail (E_IS_STORAGE (storage), FALSE);
    g_return_val_if_fail (path != NULL, FALSE);
    g_return_val_if_fail (g_path_is_absolute (path), FALSE);
    g_return_val_if_fail (e_folder != NULL, FALSE);
    g_return_val_if_fail (E_IS_FOLDER (e_folder), FALSE);

    priv = storage->priv;

    if (! e_folder_tree_add (priv->folder_tree, path, e_folder))
        return FALSE;

    p = strrchr (path, '/');
    if (p && p != path)
        parent_path = g_strndup (path, p - path);
    else
        parent_path = g_strdup ("/");
    if (g_hash_table_lookup_extended (priv->pseudofolders, parent_path,
                      &stored_path, &pseudofolder) &&
        pseudofolder != e_folder) {
        g_hash_table_remove (priv->pseudofolders, parent_path);
        g_free (stored_path);       
        e_storage_removed_folder (storage, e_folder_get_physical_uri (pseudofolder));
    }
    g_free (parent_path);

    g_signal_connect_object (e_folder, "changed", G_CALLBACK (folder_changed_cb), storage, 0);

    g_signal_emit (storage, signals[NEW_FOLDER], 0, path);

    folder_changed_cb (e_folder, storage);

    return TRUE;
}

gboolean
e_storage_has_subfolders (EStorage *storage,
              const char *path,
              const char *message)
{
    EStoragePrivate *priv;
    GList *subfolders, *f;
    EFolder *pseudofolder;
    char *pseudofolder_path;

    g_return_val_if_fail (storage != NULL, FALSE);
    g_return_val_if_fail (E_IS_STORAGE (storage), FALSE);
    g_return_val_if_fail (path != NULL, FALSE);
    g_return_val_if_fail (g_path_is_absolute (path), FALSE);
    g_return_val_if_fail (message != NULL, FALSE);

    priv = storage->priv;

    g_signal_emit (storage, signals[CLOSE_FOLDER], 0, path);

    if (g_hash_table_lookup (priv->pseudofolders, path))
        return TRUE;

    subfolders = e_folder_tree_get_subfolders (priv->folder_tree, path);
    if (subfolders != NULL) {
        for (f = subfolders; f; f = f->next)
            e_storage_removed_folder (storage, f->data);
        g_list_free (subfolders);
        /* FIXME: close parent */
    }

    pseudofolder = e_folder_new (message, "working", "");
    if (strcmp (path, "/") == 0)
        pseudofolder_path = g_strdup_printf ("/%s", message);
    else
        pseudofolder_path = g_strdup_printf ("%s/%s", path, message);
    e_folder_set_physical_uri (pseudofolder, pseudofolder_path);

    g_hash_table_insert (priv->pseudofolders, g_strdup (path), pseudofolder);

    return e_storage_new_folder (storage, pseudofolder_path, pseudofolder);
}

gboolean
e_storage_removed_folder (EStorage *storage,
              const char *path)
{
    EStoragePrivate *priv;
    EFolder *folder;
    const char *p;

    g_return_val_if_fail (storage != NULL, FALSE);
    g_return_val_if_fail (E_IS_STORAGE (storage), FALSE);
    g_return_val_if_fail (path != NULL, FALSE);
    g_return_val_if_fail (g_path_is_absolute (path), FALSE);

    priv = storage->priv;

    folder = e_folder_tree_get_folder (priv->folder_tree, path);
    if (folder == NULL)
        return FALSE;

    p = strrchr (path, '/');
    if (p != NULL && p != path) {
        EFolder *parent_folder;
        char *parent_path;

        parent_path = g_strndup (path, p - path);
        parent_folder = e_folder_tree_get_folder (priv->folder_tree, parent_path);

        if (e_folder_get_highlighted (folder))
            e_folder_set_child_highlight (parent_folder, FALSE);

        g_free (parent_path);
    }

    g_signal_emit (storage, signals[REMOVED_FOLDER], 0, path);

    e_folder_tree_remove (priv->folder_tree, path);

    return TRUE;
}


E_MAKE_TYPE (e_storage, "EStorage", EStorage, class_init, init, PARENT_TYPE)