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/*
 *  Routines to copy information from a Gaim buddy list into an
 *  Evolution addressbook.
 *
 *  I currently copy IM account names and buddy icons, provided you
 *  don't already have a buddy icon defined for a person.
 *
 *  This works today (25 October 2004), but is pretty sure to break
 *  later on as the Gaim buddylist file format shifts.
 *
 *  Nat Friedman <nat@novell.com>
 *
 *  Copyright 2004 Novell, Inc.
 *
 *  Permission is hereby granted, free of charge, to any person
 *  obtaining a copy of this software and associated documentation
 *  files (the "Software"), to deal in the Software without
 *  restriction, including without limitation the rights to use, copy,
 *  modify, merge, publish, distribute, sublicense, and/or sell copies
 *  of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *  
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *  
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 *  DEALINGS IN THE SOFTWARE.
 */
 
#include <glib.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/xmlmemory.h>
#include <e-util/e-xml-utils.h>

#include <gtk/gtk.h>
#include <libgnome/gnome-i18n.h>
#include <string.h>

#include <libebook/e-book.h>
#include <libedataserverui/e-source-option-menu.h>

#include <sys/time.h>
#include <sys/stat.h>

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

#include "bbdb.h"

typedef struct {
    char *account_name;
    char *proto;
    char *alias;
    char *icon;
} GaimBuddy;

/* Defined in bbdb.c */
EBook *bbdb_open_addressbook (void);

/* Forward declarations for this file. */
void bbdb_sync_buddy_list (void);
static gboolean bbdb_merge_buddy_to_contact (EBook *book, GaimBuddy *b, EContact *c);
static GList *bbdb_get_gaim_buddy_list (void);
static char *get_node_text (xmlNodePtr node);
static char *get_buddy_icon_from_setting (xmlNodePtr setting);
static char *get_node_text (xmlNodePtr node);
static void free_buddy_list (GList *blist);
static void parse_buddy_group (xmlNodePtr group, GList **buddies);
static EContactField proto_to_contact_field (const char *proto);

void
bbdb_sync_buddy_list_check (void)
{
    GConfClient *gconf;
    struct stat statbuf;
    time_t last_sync;
    char *blist_path;
    char *last_sync_str;

    gconf = gconf_client_get_default ();
    
    if (! gconf_client_get_bool (gconf, GCONF_KEY_ENABLE_GAIM, NULL)) {
        g_object_unref (G_OBJECT (gconf));
        return;
    }

    blist_path = g_build_path ("/", getenv ("HOME"), ".gaim/blist.xml", NULL);
    if (stat (blist_path, &statbuf) < 0) {
        g_object_unref (G_OBJECT (gconf));
        return;
    }

    /* Reprocess the buddy list if it's been updated. */
    last_sync_str = gconf_client_get_string (gconf, GCONF_KEY_GAIM_LAST_SYNC, NULL);
    if (last_sync_str == NULL || ! strcmp (last_sync_str, ""))
        last_sync = (time_t) 0;
    else
        last_sync = (time_t) g_ascii_strtoull (last_sync_str, NULL, 10);

    g_free (last_sync_str);
    g_object_unref (G_OBJECT (gconf));

    if (statbuf.st_mtime > last_sync) {
        fprintf (stderr, "bbdb: Buddy list has changed since last sync.\n");

        bbdb_sync_buddy_list ();
    }
}

void
bbdb_sync_buddy_list (void)
{
    GList       *blist, *l;
    EBook       *book = NULL;

    /* Get the Gaim buddy list */
    blist = bbdb_get_gaim_buddy_list ();
    if (blist == NULL)
        return;

    /* Open the addressbook */
    book = bbdb_open_addressbook ();
    if (book == NULL) {
        free_buddy_list (blist);
        return;
    }

    printf ("bbdb: Synchronizing buddy list to contacts...\n");
    /* Walk the buddy list */
    for (l = blist; l != NULL; l = l->next) {
        GaimBuddy *b = l->data;
        EBookQuery *query;
        GList *contacts;
        GError *error = NULL;
        EContact *c;

        if (b->alias == NULL || strlen (b->alias) == 0)
            continue;

        /* Look for an exact match full name == buddy alias */
        query = e_book_query_field_test (E_CONTACT_FULL_NAME, E_BOOK_QUERY_IS, b->alias);
        e_book_get_contacts (book, query, &contacts, NULL);
        e_book_query_unref (query);
        if (contacts != NULL) {

            /* FIXME: If there's more than one contact with this
               name, just give up; we're not smart enough for
               this. */
            if (contacts->next != NULL)
                continue;

            c = E_CONTACT (contacts->data);

            if (! bbdb_merge_buddy_to_contact (book, b, c))
                continue;

            /* Write it out to the addressbook */
            if (! e_book_commit_contact (book, c, &error)) {
                g_warning ("bbdb: Could not modify contact: %s\n", error->message);
                g_error_free (error);
            }
            continue;
        }

        /* Otherwise, create a new contact. */
        c = e_contact_new ();
        e_contact_set (c, E_CONTACT_FULL_NAME, (gpointer) b->alias);
        if (! bbdb_merge_buddy_to_contact (book, b, c)) {
            g_object_unref (G_OBJECT (c));
            continue;
        }
        
        if (! e_book_add_contact (book, c, &error)) {
            g_warning ("bbdb: Failed to add new contact: %s\n", error->message);
            g_error_free (error);
            return;
        }
        g_object_unref (G_OBJECT (c));
        
    }


    /* Update the last-sync'd time */
    {
        GConfClient *gconf;
        time_t  last_sync;
        char   *last_sync_str;

        gconf = gconf_client_get_default ();

        time (&last_sync);
        last_sync_str = g_strdup_printf ("%ld", (glong) last_sync);
        gconf_client_set_string (gconf, GCONF_KEY_GAIM_LAST_SYNC, last_sync_str, NULL);
        g_free (last_sync_str);

        g_object_unref (G_OBJECT (gconf));
    }
    printf ("bbdb: Done syncing buddy list to contacts.\n");
}

static gboolean
im_list_contains_buddy (GList *ims, GaimBuddy *b)
{
    GList *l;

    for (l = ims; l != NULL; l = l->next) {
        char *im = (char *) l->data;

        if (! strcmp (im, b->account_name))
            return TRUE;
    }

    return FALSE;
}

static gboolean
bbdb_merge_buddy_to_contact (EBook *book, GaimBuddy *b, EContact *c)
{
    EContactField field;
    GList *ims, *l;
    gboolean dirty = FALSE;

    EContactPhoto *photo = NULL;

    GError *error = NULL;

    /* Set the IM account */
    field = proto_to_contact_field (b->proto);
    ims = e_contact_get (c, field);
    if (! im_list_contains_buddy (ims, b)) {
        ims = g_list_append (ims, (gpointer) b->account_name);
        e_contact_set (c, field, (gpointer) ims);
        dirty = TRUE;
    }

        /* Set the photo if it's not set */
    if (b->icon != NULL) {
        photo = e_contact_get (c, E_CONTACT_PHOTO);
        if (photo == NULL) {

            photo = g_new0 (EContactPhoto, 1);

            if (! g_file_get_contents (b->icon, &photo->data, &photo->length, &error)) {
                g_warning ("bbdb: Could not read buddy icon: %s\n", error->message);
                g_error_free (error);
                for (l = ims; l != NULL; l = l->next)
                    g_free ((char *) l->data);
                g_list_free (ims);
                return dirty;
            }

            e_contact_set (c, E_CONTACT_PHOTO, (gpointer) photo);
            dirty = TRUE;
        }
    }

    /* Clean up */
    if (photo != NULL)
        e_contact_photo_free (photo);

    for (l = ims; l != NULL; l = l->next)
        g_free ((char *) l->data);
    g_list_free (ims);

    return dirty;
}

static EContactField
proto_to_contact_field (const char *proto)
{
    if (! strcmp (proto,  "prpl-oscar"))
        return E_CONTACT_IM_AIM;
    if (! strcmp (proto, "prpl-novell"))
        return E_CONTACT_IM_GROUPWISE;
    if (! strcmp (proto, "prpl-msn"))
        return E_CONTACT_IM_MSN;
    if (! strcmp (proto, "prpl-icq"))
        return E_CONTACT_IM_ICQ;
    if (! strcmp (proto, "prpl-yahoo"))
        return E_CONTACT_IM_YAHOO;
    if (! strcmp (proto, "prpl-jabber"))
        return E_CONTACT_IM_JABBER;

    return E_CONTACT_IM_AIM;
}

static GList *
bbdb_get_gaim_buddy_list (void)
{
    char *blist_path;
    xmlDocPtr buddy_xml;
    xmlNodePtr root, child, blist;
    GList *buddies = NULL;

    blist_path = g_build_path ("/", getenv ("HOME"), ".gaim/blist.xml", NULL);

    buddy_xml = xmlParseFile (blist_path);
    g_free (blist_path);
    if (! buddy_xml) {
        fprintf (stderr, "bbdb: Could not open Gaim buddy list.\n");
        return NULL;
    }

    root = xmlDocGetRootElement (buddy_xml);
    if (strcmp (root->name, "gaim")) {
        fprintf (stderr, "bbdb: Could not parse Gaim buddy list.\n");
        xmlFreeDoc (buddy_xml);
        return NULL;
    }

    blist = NULL;
    for (child = root->children; child != NULL; child = child->next) {
        if (! strcmp (child->name, "blist")) {
            blist = child;
            break;
        }
    }
    if (blist == NULL) {
        fprintf (stderr, "bbdb: Could not find 'blist' element in Gaim buddy list.\n");
        xmlFreeDoc (buddy_xml);
        return NULL;
    }

    for (child = blist->children; child != NULL; child = child->next) {
        if (! strcmp (child->name, "group"))
            parse_buddy_group (child, &buddies);
    }

    xmlFreeDoc (buddy_xml);

    return buddies;
}

static void
free_buddy_list (GList *blist)
{
    GList *l;

    for (l = blist; l != NULL; l = l->next) {
        GaimBuddy *gb = l->data;

        g_free (gb->icon);
        g_free (gb->alias);
        g_free (gb->account_name);
        g_free (gb->proto);
        g_free (gb);
    }

    g_list_free (l);
}

static char *
get_node_text (xmlNodePtr node)
{
    if (node->children == NULL || node->children->content == NULL ||
        strcmp (node->children->name, "text"))
        return NULL;

    return g_strdup (node->children->content);
}

static char *
get_buddy_icon_from_setting (xmlNodePtr setting)
{
    char *icon = NULL;

    icon = get_node_text (setting);
    if (icon [0] != '/') {
        char *path;

        path = g_build_path ("/", getenv ("HOME"), ".gaim/icons", icon, NULL);
        g_free (icon);
        icon = path;
    }


    return icon;
}

static void
parse_contact (xmlNodePtr contact, GList **buddies)
{
    xmlNodePtr  child;
    xmlNodePtr  buddy = NULL;
    GaimBuddy  *gb;

    for (child = contact->children; child != NULL; child = child->next) {
        if (! strcmp (child->name, "buddy")) {
            buddy = child;
            break;
        }
    }

    if (buddy == NULL) {
        fprintf (stderr, "bbdb: Could not find buddy in contact.  Malformed Gaim buddy list file.\n");
        return;
    }

    gb = g_new0 (GaimBuddy, 1);

    gb->proto = e_xml_get_string_prop_by_name (buddy, "proto");

    for (child = buddy->children; child != NULL; child = child->next) {
        if (! strcmp (child->name, "setting")) {
            char *setting_type;
            setting_type = e_xml_get_string_prop_by_name (child, "name");

            if (! strcmp (setting_type, "buddy_icon"))
                gb->icon = get_buddy_icon_from_setting (child);

            g_free (setting_type);
        } else if (! strcmp (child->name, "name"))
            gb->account_name = get_node_text (child);
        else if (! strcmp (child->name, "alias"))
            gb->alias = get_node_text (child);
            
    }

    *buddies = g_list_prepend (*buddies, gb);
}

static void
parse_buddy_group (xmlNodePtr group, GList **buddies)
{
    xmlNodePtr child;

    for (child = group->children; child != NULL; child = child->next) {
        if (strcmp (child->name, "contact"))
            continue;

        parse_contact (child, buddies);
    }
}