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/*
 *  Copyright (C) 2002  Ricardo Fernández Pascual
 *
 *  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, 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "ephy-autocompletion-source.h"
#include "ephy-filesystem-autocompletion.h"
#include "ephy-gobject-misc.h"
#include <string.h>

#include  <libgnomevfs/gnome-vfs-async-ops.h>

#define NOT_IMPLEMENTED g_warning ("not implemented: " G_STRLOC);

//#define DEBUG_MSG(x) g_print x
#define DEBUG_MSG(x)

/**
 * Private data
 */
struct _EphyFilesystemAutocompletionPrivate {
    gchar *current_dir;
    gchar *base_dir;
    GnomeVFSURI *base_dir_uri;
    gchar *basic_key;
    gchar *basic_key_dir;
    GSList *files;

    guint score;
    GnomeVFSAsyncHandle *load_handle;
};

/**
 * Private functions, only availble from this file
 */
static void     ephy_filesystem_autocompletion_class_init   (EphyFilesystemAutocompletionClass *klass);
static void     ephy_filesystem_autocompletion_init     (EphyFilesystemAutocompletion *as);
static void     ephy_filesystem_autocompletion_finalize_impl    (GObject *o);
static void     ephy_filesystem_autocompletion_autocompletion_source_init (EphyAutocompletionSourceIface *iface);
static void     ephy_filesystem_autocompletion_autocompletion_source_foreach (EphyAutocompletionSource *source,
                                             const gchar *current_text,
                                             EphyAutocompletionSourceForeachFunc func,
                                             gpointer data);
void            ephy_filesystem_autocompletion_autocompletion_source_set_basic_key (EphyAutocompletionSource *source,
                                               const gchar *basic_key);
static void     ephy_filesystem_autocompletion_emit_autocompletion_source_data_changed (EphyFilesystemAutocompletion *gh);
static void     ephy_filesystem_autocompletion_set_current_dir  (EphyFilesystemAutocompletion *fa, const gchar *d);


static gpointer g_object_class;

/**
 * FilesystemAutocompletion object
 */
MAKE_GET_TYPE_IFACE (ephy_filesystem_autocompletion, "EphyFilesystemAutocompletion", EphyFilesystemAutocompletion,
             ephy_filesystem_autocompletion_class_init, ephy_filesystem_autocompletion_init, G_TYPE_OBJECT,
             ephy_filesystem_autocompletion_autocompletion_source_init, EPHY_TYPE_AUTOCOMPLETION_SOURCE);

static void
ephy_filesystem_autocompletion_autocompletion_source_init (EphyAutocompletionSourceIface *iface)
{
    iface->foreach = ephy_filesystem_autocompletion_autocompletion_source_foreach;
    iface->set_basic_key = ephy_filesystem_autocompletion_autocompletion_source_set_basic_key;
}

static void
ephy_filesystem_autocompletion_class_init (EphyFilesystemAutocompletionClass *klass)
{
    G_OBJECT_CLASS (klass)->finalize = ephy_filesystem_autocompletion_finalize_impl;

    g_object_class = g_type_class_peek_parent (klass);
}

static void 
ephy_filesystem_autocompletion_init (EphyFilesystemAutocompletion *e)
{
    EphyFilesystemAutocompletionPrivate *p = g_new0 (EphyFilesystemAutocompletionPrivate, 1);
    e->priv = p;

    p->score = G_MAXINT / 2;
    p->base_dir = g_strdup ("");
}

static void
ephy_filesystem_autocompletion_finalize_impl (GObject *o)
{
    EphyFilesystemAutocompletion *as = GUL_FILESYSTEM_AUTOCOMPLETION (o);
    EphyFilesystemAutocompletionPrivate *p = as->priv;

    DEBUG_MSG (("in ephy_filesystem_autocompletion_finalize_impl\n"));

    g_free (p->basic_key);
    g_free (p->basic_key_dir);
    g_free (p->current_dir);
    g_free (p->base_dir);
    if (p->base_dir_uri) 
    {
        gnome_vfs_uri_unref (p->base_dir_uri);
    }

    g_free (p);

    G_OBJECT_CLASS (g_object_class)->finalize (o);
}

EphyFilesystemAutocompletion *
ephy_filesystem_autocompletion_new (void)
{
    EphyFilesystemAutocompletion *ret = g_object_new (GUL_TYPE_FILESYSTEM_AUTOCOMPLETION, NULL);
    return ret;
}


static gchar *
gfa_get_nearest_dir (const gchar *path)
{
    gchar *ret;
    const gchar *lastslash = rindex (path, '/');
    
    if (lastslash)
    {
        if (!strcmp (path, "file://"))
        {
            /* without this, gnome-vfs does not recognize it as a dir */
            ret = g_strdup ("file:///");
        }
        else
        {
            ret = g_strndup (path, lastslash - path + 1);
        }
    }
    else
    {
        ret = g_strdup ("");
    }

    return ret;
}

static void
ephy_filesystem_autocompletion_autocompletion_source_foreach (EphyAutocompletionSource *source,
                                 const gchar *basic_key,
                                 EphyAutocompletionSourceForeachFunc func,
                                 gpointer data)
{
    EphyFilesystemAutocompletion *fa = GUL_FILESYSTEM_AUTOCOMPLETION (source);
    EphyFilesystemAutocompletionPrivate *p = fa->priv;
    GSList *li;

    ephy_filesystem_autocompletion_autocompletion_source_set_basic_key (source, basic_key);

    for (li = p->files; li; li = li->next)
    {
        func (source, li->data, li->data, li->data, FALSE, FALSE, p->score, data);
    }
    
}

static void
ephy_filesystem_autocompletion_emit_autocompletion_source_data_changed (EphyFilesystemAutocompletion *fa)
{
    g_signal_emit_by_name (fa, "data-changed");
}

static void
gfa_load_directory_cb (GnomeVFSAsyncHandle *handle,
               GnomeVFSResult result,
               GList *list,
               guint entries_read,
               gpointer callback_data)
{
    EphyFilesystemAutocompletion *fa = callback_data;
    EphyFilesystemAutocompletionPrivate *p = fa->priv;
    GList *li;
    gchar *cd;

    g_return_if_fail (p->load_handle == handle);

    DEBUG_MSG (("gfa_load_directory_cb, entries_read == %d\n", entries_read));

    if (entries_read <= 0)
    {
        return;
    }
    
    if (p->basic_key_dir[strlen (p->basic_key_dir) - 1] == G_DIR_SEPARATOR
        || p->basic_key_dir[0] == '\0')
    {
        cd = g_strdup (p->basic_key_dir);
    }
    else
    {
        cd = g_strconcat (p->basic_key_dir, G_DIR_SEPARATOR_S, NULL);
    }

    for (li = list; li; li = li->next)
    {
        GnomeVFSFileInfo *i = li->data;
        if (!(i->name[0] == '.' 
              && (i->name[1] == '\0'
              || (i->name[1] == '.'
                  && i->name[2] == '\0'))))
        {
            gchar *f = g_strconcat (cd, i->name, NULL);
            p->files = g_slist_prepend (p->files, f);
            
            DEBUG_MSG (("+ %s\n", f));
        }
    }

    g_free (cd);

    ephy_filesystem_autocompletion_emit_autocompletion_source_data_changed (fa);
}

static void
ephy_filesystem_autocompletion_set_current_dir (EphyFilesystemAutocompletion *fa, const gchar *d)
{
    EphyFilesystemAutocompletionPrivate *p = fa->priv;
    GnomeVFSURI *cd_uri;

    if (p->base_dir_uri)
    {
        cd_uri = gnome_vfs_uri_append_path (p->base_dir_uri, d);
    }
    else
    {
        cd_uri = gnome_vfs_uri_new (d);
    }

    if (p->load_handle)
    {
        gnome_vfs_async_cancel (p->load_handle);
        p->load_handle = NULL;
    }

    if (p->files)
    {
        g_slist_foreach (p->files, (GFunc) g_free, NULL);
        g_slist_free (p->files);
        p->files = NULL;

        ephy_filesystem_autocompletion_emit_autocompletion_source_data_changed (fa);
    }
    
    if (!cd_uri)
    {
        DEBUG_MSG (("Can't load dir %s\n", d));
        return;
    }

    g_free (p->current_dir);
    p->current_dir = gnome_vfs_uri_to_string (cd_uri, GNOME_VFS_URI_HIDE_NONE);

    DEBUG_MSG (("Loading dir: %s\n", p->current_dir));

    gnome_vfs_async_load_directory_uri (&p->load_handle,
                        cd_uri,
                        GNOME_VFS_FILE_INFO_DEFAULT,
                        100,
                        0,
                        gfa_load_directory_cb,
                        fa);

    gnome_vfs_uri_unref (cd_uri);
}

void
ephy_filesystem_autocompletion_autocompletion_source_set_basic_key (EphyAutocompletionSource *source,
                                   const gchar *basic_key)
{
    EphyFilesystemAutocompletion *fa = GUL_FILESYSTEM_AUTOCOMPLETION (source);
    EphyFilesystemAutocompletionPrivate *p = fa->priv;
    gchar *new_basic_key_dir;
    
    if (p->basic_key && !strcmp (p->basic_key, basic_key))
    {
        return;
    }

    g_free (p->basic_key);
    p->basic_key = g_strdup (basic_key);

    new_basic_key_dir = gfa_get_nearest_dir (basic_key);
    if (p->basic_key_dir && !strcmp (p->basic_key_dir, new_basic_key_dir))
    {
        g_free (new_basic_key_dir);
    }
    else
    {
        g_free (p->basic_key_dir);
        p->basic_key_dir = new_basic_key_dir;
        ephy_filesystem_autocompletion_set_current_dir (fa, p->basic_key_dir);
    }
}

void
ephy_filesystem_autocompletion_set_base_dir (EphyFilesystemAutocompletion *fa, const gchar *d)
{
    EphyFilesystemAutocompletionPrivate *p = fa->priv;

    g_free (p->base_dir);
    p->base_dir = g_strdup (d);

    if (p->base_dir_uri) 
    {
        gnome_vfs_uri_unref (p->base_dir_uri);
    }

    if (p->base_dir[0])
    {
        p->base_dir_uri = gnome_vfs_uri_new (p->base_dir);
    }
    else
    {
        p->base_dir_uri = NULL;
    }

    if (p->base_dir_uri)
    {
        gchar *t = gnome_vfs_uri_to_string (p->base_dir_uri, GNOME_VFS_URI_HIDE_NONE);
        DEBUG_MSG (("base_dir: %s\n", t));
        g_free (t);
    }
}