/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2003-2007 Imendio AB
 * Copyright (C) 2007 Collabora Ltd.
 *
 * 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.
 *
 * Authors: Richard Hult <richard@imendio.com>
 *          Martyn Russell <martyn@imendio.com>
 *          Xavier Claessens <xclaesse@gmail.com>
 */

#include "config.h"

#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <regex.h>

#include <glib/gi18n.h>

#include <libxml/uri.h>
#include <libmissioncontrol/mc-account.h>
#include <libtelepathy/tp-helpers.h>

#include "gossip-debug.h"
#include "gossip-utils.h"
#include "gossip-paths.h"
#include "empathy-contact-manager.h"

#define DEBUG_DOMAIN "Utils"

static void regex_init (void);

gchar *
gossip_substring (const gchar *str,
		  gint         start,
		  gint         end)
{
	return g_strndup (str + start, end - start);
}

/*
 * Regular Expression code to match urls.
 */
#define USERCHARS "-A-Za-z0-9"
#define PASSCHARS "-A-Za-z0-9,?;.:/!%$^*&~\"#'"
#define HOSTCHARS "-A-Za-z0-9"
#define PATHCHARS "-A-Za-z0-9_$.+!*(),;:@&=?/~#%"
#define SCHEME    "(news:|telnet:|nntp:|file:/|https?:|ftps?:|webcal:)"
#define USER      "[" USERCHARS "]+(:["PASSCHARS "]+)?"
#define URLPATH   "/[" PATHCHARS "]*[^]'.}>) \t\r\n,\\\"]"

static regex_t dingus[GOSSIP_REGEX_ALL];

static void
regex_init (void)
{
	static gboolean  inited = FALSE;
	const gchar     *expression;
	gint             i;

	if (inited) {
		return;
	}

	for (i = 0; i < GOSSIP_REGEX_ALL; i++) {
		switch (i) {
		case GOSSIP_REGEX_AS_IS:
			expression =
				SCHEME "//(" USER "@)?[" HOSTCHARS ".]+"
				"(:[0-9]+)?(" URLPATH ")?";
			break;
		case GOSSIP_REGEX_BROWSER:
			expression =
				"(www|ftp)[" HOSTCHARS "]*\\.[" HOSTCHARS ".]+"
				"(:[0-9]+)?(" URLPATH ")?";
			break;
		case GOSSIP_REGEX_EMAIL:
			expression =
				"(mailto:)?[a-z0-9][a-z0-9.-]*@[a-z0-9]"
				"[a-z0-9-]*(\\.[a-z0-9][a-z0-9-]*)+";
			break;
		case GOSSIP_REGEX_OTHER:
			expression =
				"news:[-A-Z\\^_a-z{|}~!\"#$%&'()*+,./0-9;:=?`]+"
				"@[" HOSTCHARS ".]+(:[0-9]+)?";
			break;
		default:
			/* Silence the compiler. */
			expression = NULL;
			continue;
		}

		memset (&dingus[i], 0, sizeof (regex_t));
		regcomp (&dingus[i], expression, REG_EXTENDED | REG_ICASE);
	}

	inited = TRUE;
}

gint
gossip_regex_match (GossipRegExType  type,
		    const gchar     *msg,
		    GArray          *start,
		    GArray          *end)
{
	regmatch_t matches[1];
	gint       ret = 0;
	gint       num_matches = 0;
	gint       offset = 0;
	gint       i;

	g_return_val_if_fail (type >= 0 || type <= GOSSIP_REGEX_ALL, 0);

	regex_init ();

	while (!ret && type != GOSSIP_REGEX_ALL) {
		ret = regexec (&dingus[type], msg + offset, 1, matches, 0);
		if (ret == 0) {
			gint s;

			num_matches++;

			s = matches[0].rm_so + offset;
			offset = matches[0].rm_eo + offset;

			g_array_append_val (start, s);
			g_array_append_val (end, offset);
		}
	}

	if (type != GOSSIP_REGEX_ALL) {
		gossip_debug (DEBUG_DOMAIN,
			      "Found %d matches for regex type:%d",
			      num_matches, type);
		return num_matches;
	}

	/* If GOSSIP_REGEX_ALL then we run ALL regex's on the string. */
	for (i = 0; i < GOSSIP_REGEX_ALL; i++, ret = 0) {
		while (!ret) {
			ret = regexec (&dingus[i], msg + offset, 1, matches, 0);
			if (ret == 0) {
				gint s;

				num_matches++;

				s = matches[0].rm_so + offset;
				offset = matches[0].rm_eo + offset;

				g_array_append_val (start, s);
				g_array_append_val (end, offset);
			}
		}
	}

	gossip_debug (DEBUG_DOMAIN,
		      "Found %d matches for ALL regex types",
		      num_matches);

	return num_matches;
}

gint
gossip_strcasecmp (const gchar *s1,
		   const gchar *s2)
{
	return gossip_strncasecmp (s1, s2, -1);
}

gint
gossip_strncasecmp (const gchar *s1,
		    const gchar *s2,
		    gsize        n)
{
	gchar *u1, *u2;
	gint   ret_val;

	u1 = g_utf8_casefold (s1, n);
	u2 = g_utf8_casefold (s2, n);

	ret_val = g_utf8_collate (u1, u2);
	g_free (u1);
	g_free (u2);

	return ret_val;
}

gboolean
gossip_xml_validate (xmlDoc      *doc,
		     const gchar *dtd_filename)
{
	gchar        *path, *escaped;
	xmlValidCtxt  cvp;
	xmlDtd       *dtd;
	gboolean      ret;

	path = gossip_paths_get_dtd_path (dtd_filename);

	/* The list of valid chars is taken from libxml. */
	escaped = xmlURIEscapeStr (path, ":@&=+$,/?;");

	g_free (path);

	memset (&cvp, 0, sizeof (cvp));
	dtd = xmlParseDTD (NULL, escaped);
	ret = xmlValidateDtd (&cvp, doc, dtd);

	xmlFree (escaped);
	xmlFreeDtd (dtd);

	return ret;
}

xmlNodePtr
gossip_xml_node_get_child (xmlNodePtr   node, 
			   const gchar *child_name)
{
	xmlNodePtr l;

        g_return_val_if_fail (node != NULL, NULL);
        g_return_val_if_fail (child_name != NULL, NULL);

	for (l = node->children; l; l = l->next) {
		if (l->name && strcmp (l->name, child_name) == 0) {
			return l;
		}
	}

	return NULL;
}

xmlChar *
gossip_xml_node_get_child_content (xmlNodePtr   node, 
				   const gchar *child_name)
{
	xmlNodePtr l;

        g_return_val_if_fail (node != NULL, NULL);
        g_return_val_if_fail (child_name != NULL, NULL);

	l = gossip_xml_node_get_child (node, child_name);
	if (l) {
		return xmlNodeGetContent (l);
	}
		
	return NULL;
}

xmlNodePtr
gossip_xml_node_find_child_prop_value (xmlNodePtr   node, 
				       const gchar *prop_name,
				       const gchar *prop_value)
{
	xmlNodePtr l;
	xmlNodePtr found = NULL;

        g_return_val_if_fail (node != NULL, NULL);
        g_return_val_if_fail (prop_name != NULL, NULL);
        g_return_val_if_fail (prop_value != NULL, NULL);

	for (l = node->children; l && !found; l = l->next) {
		xmlChar *prop;

		if (!xmlHasProp (l, prop_name)) {
			continue;
		}

		prop = xmlGetProp (l, prop_name);
		if (prop && strcmp (prop, prop_value) == 0) {
			found = l;
		}
		
		xmlFree (prop);
	}
		
	return found;
}

GType
gossip_dbus_type_to_g_type (const gchar *dbus_type_string)
{
	if (dbus_type_string == NULL)
		return G_TYPE_NONE;

	if (dbus_type_string[0] == 's') {
		return G_TYPE_STRING;
	}
	else if (dbus_type_string[0] == 'b') {
		return G_TYPE_BOOLEAN;
	}
	else if (dbus_type_string[0] == 'q') {
		return G_TYPE_UINT;
	}
	else if (dbus_type_string[0] == 'n') {
		return G_TYPE_INT;
	}

	g_assert_not_reached ();
	return G_TYPE_NONE;
}

const gchar *
gossip_g_type_to_dbus_type (GType g_type)
{
	switch (g_type) {
	case G_TYPE_STRING:
		return "s";
	case G_TYPE_BOOLEAN:
		return "b";
	case G_TYPE_UINT:
		return "q";
	case G_TYPE_INT:
		return "n";
	default:
		g_assert_not_reached ();
	}

	return NULL;
}

gchar *
gossip_g_value_to_string (const GValue *value)
{
	gchar  *return_string = NULL;
	GValue  string_g_value = {0, };

	g_value_init (&string_g_value, G_TYPE_STRING);
	g_value_transform (value, &string_g_value);
	return_string = g_value_dup_string (&string_g_value);
	g_value_unset (&string_g_value);

	return return_string;
}

GValue *
gossip_string_to_g_value (const gchar *str, GType type)
{
	GValue *g_value;

	g_value = g_new0 (GValue, 1);
	g_value_init (g_value, type);

	switch (type) {
	case G_TYPE_STRING:
		g_value_set_string (g_value, str);
		break;
	case G_TYPE_BOOLEAN:
		g_value_set_boolean (g_value, (str[0] == 'y' || str[0] == 'T'));
		break;
	case G_TYPE_UINT:
		g_value_set_uint (g_value, atoi (str));
		break;
	case G_TYPE_INT:
		g_value_set_int (g_value, atoi (str));
		break;
	default:
		g_assert_not_reached ();
	}

	return g_value;
}

gboolean
gossip_g_value_equal (const GValue *value1,
		      const GValue *value2)
{
	GType type;

	g_return_val_if_fail (value1 != NULL, FALSE);
	g_return_val_if_fail (value2 != NULL, FALSE);

	type = G_VALUE_TYPE (value1);
	if (type != G_VALUE_TYPE (value2)) {
		return FALSE;
	}

	switch (type)
	{
	case G_TYPE_STRING: {
		const gchar *str1;
		const gchar *str2;

		str1 = g_value_get_string (value1);
		str2 = g_value_get_string (value2);
		return (str1 && str2 && strcmp (str1, str2) == 0) ||
		       (G_STR_EMPTY (str1) && G_STR_EMPTY (str2));
	}
	case G_TYPE_BOOLEAN:
		return g_value_get_boolean (value1) == g_value_get_boolean (value2);
	case G_TYPE_UINT:
		return g_value_get_uint (value1) == g_value_get_uint (value2);
	case G_TYPE_INT:
		return g_value_get_int (value1) == g_value_get_int (value2);
	default:
		g_warning ("Unsupported GType in value comparaison");
	}

	return FALSE;
}

guint
gossip_account_hash (gconstpointer key)
{
	return g_str_hash (mc_account_get_unique_name (MC_ACCOUNT (key)));
}

gboolean
gossip_account_equal (gconstpointer a,
		      gconstpointer b)
{
	const gchar *name_a;
	const gchar *name_b;

	name_a = mc_account_get_unique_name (MC_ACCOUNT (a));
	name_b = mc_account_get_unique_name (MC_ACCOUNT (b));

	return g_str_equal (name_a, name_b);
}

GossipContact *
gossip_get_own_contact_from_contact (GossipContact  *contact)
{
	EmpathyContactManager *manager;
	McAccount             *account;
	GossipContact         *own_contact;

	g_return_val_if_fail (GOSSIP_IS_CONTACT (contact), NULL);

	manager = empathy_contact_manager_new ();
	account = gossip_contact_get_account (contact);
	own_contact = empathy_contact_manager_get_own (manager, account);
	g_object_unref (manager);

	return own_contact;
}

MissionControl *
gossip_mission_control_new (void)
{
	static MissionControl *mc = NULL;

	if (!mc) {
		mc = mission_control_new (tp_get_bus ());
		g_object_add_weak_pointer (G_OBJECT (mc), (gpointer) &mc);
	} else {
		g_object_ref (mc);
	}

	return mc;
}