/*
 *  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.
 *
 * 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; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *		Nat Friedman <nat@novell.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/xmlmemory.h>

#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include <string.h>

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

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

#include "bbdb.h"

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

/* Forward declarations for this file. */
static gboolean	bbdb_merge_buddy_to_contact	(EBookClient *client,
						 GaimBuddy *buddy,
						 EContact *contact);
static void	bbdb_get_gaim_buddy_list	(GQueue *out_buddies);
static gchar *	get_node_text			(xmlNodePtr node);
static gchar *	get_buddy_icon_from_setting	(xmlNodePtr setting);
static void	parse_buddy_group		(xmlNodePtr group,
						 GQueue *out_buddies,
						 GSList *blocked);
static EContactField
		proto_to_contact_field		(const gchar *proto);

static void
free_gaim_body (GaimBuddy *gb)
{
	if (gb != NULL) {
		g_free (gb->icon);
		g_free (gb->alias);
		g_free (gb->account_name);
		g_free (gb->proto);
		g_free (gb);
	}
}

static gchar *
get_buddy_filename (void)
{
	return g_build_filename (
		g_get_home_dir (), ".purple", "blist.xml", NULL);
}

static gchar *
get_md5_as_string (const gchar *filename)
{
	GMappedFile *mapped_file;
	const gchar *contents;
	gchar *digest;
	gsize length;
	GError *error = NULL;

	g_return_val_if_fail (filename != NULL, NULL);

	mapped_file = g_mapped_file_new (filename, FALSE, &error);
	if (mapped_file == NULL) {
		g_warning ("%s", error->message);
		return NULL;
	}

	contents = g_mapped_file_get_contents (mapped_file);
	length = g_mapped_file_get_length (mapped_file);

	digest = g_compute_checksum_for_data (
		G_CHECKSUM_MD5, (guchar *) contents, length);

	g_mapped_file_unref (mapped_file);

	return digest;
}

void
bbdb_sync_buddy_list_check (void)
{
	struct stat statbuf;
	time_t last_sync_time;
	gchar *md5;
	gchar *blist_path;
	gchar *last_sync_str;
	GSettings *settings = g_settings_new (CONF_SCHEMA);

	blist_path = get_buddy_filename ();
	if (stat (blist_path, &statbuf) < 0) {
		g_free (blist_path);
		return;
	}

	/* Reprocess the buddy list if it's been updated. */
	last_sync_str = g_settings_get_string (settings, CONF_KEY_GAIM_LAST_SYNC_TIME);
	if (last_sync_str == NULL || !strcmp ((const gchar *) last_sync_str, ""))
		last_sync_time = (time_t) 0;
	else
		last_sync_time = (time_t) g_ascii_strtoull (last_sync_str, NULL, 10);

	g_free (last_sync_str);

	if (statbuf.st_mtime <= last_sync_time) {
		g_object_unref (G_OBJECT (settings));
		g_free (blist_path);
		return;
	}

	last_sync_str = g_settings_get_string (
		settings, CONF_KEY_GAIM_LAST_SYNC_MD5);

	g_object_unref (settings);

	md5 = get_md5_as_string (blist_path);

	if (!last_sync_str || !*last_sync_str || !g_str_equal (md5, last_sync_str)) {
		fprintf (stderr, "bbdb: Buddy list has changed since last sync.\n");

		bbdb_sync_buddy_list ();
	}

	g_free (last_sync_str);
	g_free (blist_path);
	g_free (md5);
}

static gboolean
store_last_sync_idle_cb (gpointer data)
{
	GSettings *settings;
	gchar *md5;
	gchar *blist_path = get_buddy_filename ();
	time_t last_sync;
	gchar *last_sync_time;

	time (&last_sync);
	last_sync_time = g_strdup_printf ("%ld", (glong) last_sync);

	md5 = get_md5_as_string (blist_path);

	settings = g_settings_new (CONF_SCHEMA);
	g_settings_set_string (
		settings, CONF_KEY_GAIM_LAST_SYNC_TIME, last_sync_time);
	g_settings_set_string (
		settings, CONF_KEY_GAIM_LAST_SYNC_MD5, md5);

	g_object_unref (G_OBJECT (settings));

	g_free (last_sync_time);
	g_free (blist_path);
	g_free (md5);

	return FALSE;
}

static gboolean syncing = FALSE;
G_LOCK_DEFINE_STATIC (syncing);

static gpointer
bbdb_sync_buddy_list_in_thread (gpointer data)
{
	EBookClient *client;
	GQueue *buddies = data;
	GList *head, *link;
	GError *error = NULL;

	g_return_val_if_fail (buddies != NULL, NULL);

	client = bbdb_create_book_client (GAIM_ADDRESSBOOK, NULL, &error);
	if (error != NULL) {
		g_warning (
			"bbdb: Failed to get addressbook: %s",
			error->message);
		g_error_free (error);
		goto exit;
	}

	printf ("bbdb: Synchronizing buddy list to contacts...\n");

	/* Walk the buddy list */

	head = g_queue_peek_head_link (buddies);

	for (link = head; link != NULL; link = g_list_next (link)) {
		GaimBuddy *b = link->data;
		EBookQuery *query;
		gchar *query_string;
		GSList *contacts = NULL;
		EContact *c;

		if (b->alias == NULL || strlen (b->alias) == 0) {
			g_free (b->alias);
			b->alias = g_strdup (b->account_name);
		}

		/* 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);
		query_string = e_book_query_to_string (query);
		e_book_query_unref (query);
		if (!e_book_client_get_contacts_sync (
			client, query_string, &contacts, NULL, NULL)) {
			g_free (query_string);
			continue;
		}

		g_free (query_string);

		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) {
				g_slist_free_full (
					contacts,
					(GDestroyNotify) g_object_unref);
				continue;
			}

			c = E_CONTACT (contacts->data);

			if (!bbdb_merge_buddy_to_contact (client, b, c)) {
				g_slist_free_full (
					contacts,
					(GDestroyNotify) g_object_unref);
				continue;
			}

			/* Write it out to the addressbook */
			e_book_client_modify_contact_sync (
				client, c, NULL, &error);

			if (error != NULL) {
				g_warning (
					"bbdb: Could not modify contact: %s",
					error->message);
				g_clear_error (&error);
			}

			g_slist_free_full (
				contacts,
				(GDestroyNotify) g_object_unref);
			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 (client, b, c)) {
			g_object_unref (c);
			continue;
		}

		e_book_client_add_contact_sync (client, c, NULL, NULL, &error);

		if (error != NULL) {
			g_warning (
				"bbdb: Failed to add new contact: %s",
				error->message);
			g_clear_error (&error);
			goto exit;
		}

		g_object_unref (c);
	}

	g_idle_add (store_last_sync_idle_cb, NULL);

exit:
	printf ("bbdb: Done syncing buddy list to contacts.\n");

	g_clear_object (&client);

	g_queue_free_full (buddies, (GDestroyNotify) free_gaim_body);

	G_LOCK (syncing);
	syncing = FALSE;
	G_UNLOCK (syncing);

	return NULL;
}

void
bbdb_sync_buddy_list (void)
{
	GQueue *buddies;

	G_LOCK (syncing);
	if (syncing) {
		G_UNLOCK (syncing);
		printf ("bbdb: Already syncing buddy list, skipping this call\n");
		return;
	}

	buddies = g_queue_new ();
	bbdb_get_gaim_buddy_list (buddies);

	if (g_queue_is_empty (buddies)) {
		g_queue_free (buddies);
	} else {
		GThread *thread;

		syncing = TRUE;

		thread = g_thread_new (
			NULL, bbdb_sync_buddy_list_in_thread, buddies);
		g_thread_unref (thread);
	}

	G_UNLOCK (syncing);
}

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

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

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

	return FALSE;
}

static gboolean
bbdb_merge_buddy_to_contact (EBookClient *client,
                             GaimBuddy *b,
                             EContact *c)
{
	EContactField field;
	GList *ims;
	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, g_strdup (b->account_name));
		e_contact_set (c, field, (gpointer) ims);
		dirty = TRUE;
	}

	g_list_foreach (ims, (GFunc) g_free, NULL);
	g_list_free (ims);
	ims = NULL;

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

			photo = g_new0 (EContactPhoto, 1);
			photo->type = E_CONTACT_PHOTO_TYPE_INLINED;

			if (!g_file_get_contents (
				b->icon, &contents,
				&photo->data.inlined.length, &error)) {
				g_warning (
					"bbdb: Could not read buddy icon: "
					"%s\n", error->message);
				g_error_free (error);
				return dirty;
			}

			photo->data.inlined.data = (guchar *) contents;
			e_contact_set (c, E_CONTACT_PHOTO, (gpointer) photo);
			dirty = TRUE;
		}
	}

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

	return dirty;
}

static EContactField
proto_to_contact_field (const gchar *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;
	if (!strcmp (proto, "prpl-gg"))
		return E_CONTACT_IM_GADUGADU;

	return E_CONTACT_IM_AIM;
}

static void
get_all_blocked (xmlNodePtr node,
                 GSList **blocked)
{
	xmlNodePtr child;

	if (!node || !blocked)
		return;

	for (child = node->children; child; child = child->next) {
		if (child->children)
			get_all_blocked (child, blocked);

		if (!strcmp ((const gchar *) child->name, "block")) {
			gchar *name = get_node_text (child);

			if (name)
				*blocked = g_slist_prepend (*blocked, name);
		}
	}
}

static void
bbdb_get_gaim_buddy_list (GQueue *out_buddies)
{
	gchar *blist_path;
	xmlDocPtr buddy_xml;
	xmlNodePtr root, child, blist;
	GSList *blocked = NULL;

	blist_path = get_buddy_filename ();

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

	root = xmlDocGetRootElement (buddy_xml);
	if (strcmp ((const gchar *) root->name, "purple")) {
		fprintf (stderr, "bbdb: Could not parse Pidgin buddy list.\n");
		xmlFreeDoc (buddy_xml);
		return;
	}

	for (child = root->children; child != NULL; child = child->next) {
		if (!strcmp ((const gchar *) child->name, "privacy")) {
			get_all_blocked (child, &blocked);
			break;
		}
	}

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

	for (child = blist->children; child != NULL; child = child->next) {
		if (!strcmp ((const gchar *) child->name, "group"))
			parse_buddy_group (child, out_buddies, blocked);
	}

	xmlFreeDoc (buddy_xml);

	g_slist_foreach (blocked, (GFunc) g_free, NULL);
	g_slist_free (blocked);
}

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

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

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

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

		path = g_build_path ("/", g_get_home_dir (), ".purple/icons", icon, NULL);
		g_free (icon);
		icon = path;
	}

	return icon;
}

static void
parse_contact (xmlNodePtr contact,
               GQueue *out_buddies,
               GSList *blocked)
{
	xmlNodePtr  child;
	xmlNodePtr  buddy = NULL;
	GaimBuddy  *gb;
	gboolean    is_blocked = FALSE;

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

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

	gb = g_new0 (GaimBuddy, 1);

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

	for (child = buddy->children; child != NULL && !is_blocked; child = child->next) {
		if (!strcmp ((const gchar *) child->name, "setting")) {
			gchar *setting_type;

			setting_type = e_xml_get_string_prop_by_name (
				child, (const guchar *)"name");

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

			g_free (setting_type);
		} else if (!strcmp ((const gchar *) child->name, "name")) {
			gb->account_name = get_node_text (child);
			is_blocked = g_slist_find_custom (
				blocked, gb->account_name,
				(GCompareFunc) strcmp) != NULL;
		} else if (!strcmp ((const gchar *) child->name, "alias"))
			gb->alias = get_node_text (child);

	}

	if (is_blocked)
		free_gaim_body (gb);
	else
		g_queue_push_tail (out_buddies, gb);
}

static void
parse_buddy_group (xmlNodePtr group,
                   GQueue *out_buddies,
                   GSList *blocked)
{
	xmlNodePtr child;

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

		parse_contact (child, out_buddies, blocked);
	}
}