/*
 * pua_usrloc module - usrloc pua module
 *
 * Copyright (C) 2006 Voice Sistem S.R.L.
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio 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
 *
 * Kamailio 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libxml/parser.h>
#include <time.h>

#include "../../core/parser/parse_expires.h"
#include "../../core/parser/msg_parser.h"
#include "../../core/str.h"
#include "../../core/str_list.h"
#include "../../core/name_alias.h"
#include "../../core/socket_info.h"
#include "../usrloc/usrloc.h"
#include "../usrloc/ul_callback.h"
#include "../../modules/tm/tm_load.h"
#include "../pua/pua.h"
#include "pua_dialoginfo.h"

/* global modul parameters */
extern int include_callid;
extern int include_localremote;
extern int include_tags;


/* for debug purpose only */
void print_publ(publ_info_t* p)
{
	LM_DBG("publ:\n");
	LM_DBG("uri= %.*s\n", p->pres_uri->len, p->pres_uri->s);
	LM_DBG("id= %.*s\n", p->id.len, p->id.s);
	LM_DBG("expires= %d\n", p->expires);
}

str* build_dialoginfo(char *state, str *entity, str *peer, str *callid,
		unsigned int initiator, str *localtag, str *remotetag,
		str *localtarget, str *remotetarget)
{
	xmlDocPtr  doc = NULL;
	xmlNodePtr root_node = NULL;
	xmlNodePtr dialog_node = NULL;
	xmlNodePtr state_node = NULL;
	xmlNodePtr remote_node = NULL;
	xmlNodePtr local_node = NULL;
	xmlNodePtr tag_node = NULL;
	str *body= NULL;
	char buf[MAX_URI_SIZE+1];

	if (entity->len > MAX_URI_SIZE) {
		LM_ERR("entity URI '%.*s' too long, maximum=%d\n",entity->len,
				entity->s, MAX_URI_SIZE);
		return NULL;
	}
	memcpy(buf, entity->s, entity->len);
	buf[entity->len]= '\0';

	/* create the Publish body */
	doc = xmlNewDoc(BAD_CAST "1.0");
	if(doc==0)
		return NULL;

	root_node = xmlNewNode(NULL, BAD_CAST "dialog-info");
	if(root_node==0)
		goto error;

	xmlDocSetRootElement(doc, root_node);

	xmlNewProp(root_node, BAD_CAST "xmlns",
			BAD_CAST "urn:ietf:params:xml:ns:dialog-info");
	/* we set the version to 0 but it should be set to the correct value
	 * in the pua module */
	xmlNewProp(root_node, BAD_CAST "version",
			BAD_CAST "0");
	xmlNewProp(root_node, BAD_CAST  "state",
			BAD_CAST "full" );
	xmlNewProp(root_node, BAD_CAST "entity",
			BAD_CAST buf);

	/* RFC 3245 differs between id and call-id. For example if a call
	 * is forked and 2 early dialogs are established, we should send 2
	 * PUBLISH requests, both have the same call-id but different id.
	 * Thus, id could be for example derived from the totag.
	 *
	 * Currently the dialog module does not support multiple dialogs.
	 * Thus, it does no make sense to differ here between multiple dialog.
	 * Thus, id and call-id will be populated identically */

	/* dialog tag */
	dialog_node =xmlNewChild(root_node, NULL, BAD_CAST "dialog", NULL) ;
	if( dialog_node ==NULL)
	{
		LM_ERR("while adding child\n");
		goto error;
	}

	if (callid->len > MAX_URI_SIZE) {
		LM_ERR("call-id '%.*s' too long, maximum=%d\n", callid->len,
				callid->s, MAX_URI_SIZE);
		goto error;
	}
	memcpy(buf, callid->s, callid->len);
	buf[callid->len]= '\0';

	xmlNewProp(dialog_node, BAD_CAST "id", BAD_CAST buf);
	if (include_callid) {
		xmlNewProp(dialog_node, BAD_CAST "call-id", BAD_CAST buf);
	}
	if (include_tags) {
		if (localtag && localtag->s) {
			if (localtag->len > MAX_URI_SIZE) {
				LM_ERR("localtag '%.*s' too long, maximum=%d\n",
						localtag->len, localtag->s, MAX_URI_SIZE);
				goto error;
			}
			memcpy(buf, localtag->s, localtag->len);
			buf[localtag->len]= '\0';
			xmlNewProp(dialog_node, BAD_CAST "local-tag", BAD_CAST buf);
		}
		if (remotetag && remotetag->s) {
			if (remotetag->len > MAX_URI_SIZE) {
				LM_ERR("remotetag '%.*s' too long, maximum=%d\n",
						remotetag->len, remotetag->s, MAX_URI_SIZE);
				goto error;
			}
			memcpy(buf, remotetag->s, remotetag->len);
			buf[remotetag->len]= '\0';
			xmlNewProp(dialog_node, BAD_CAST "remote-tag", BAD_CAST buf);
		}
	}

	if (initiator) {
		xmlNewProp(dialog_node, BAD_CAST "direction", BAD_CAST "initiator");
	}else {
		xmlNewProp(dialog_node, BAD_CAST "direction", BAD_CAST "recipient");
	}

	/* state tag */
	state_node = xmlNewChild(dialog_node, NULL, BAD_CAST "state",
			BAD_CAST state) ;
	if( state_node ==NULL)
	{
		LM_ERR("while adding child\n");
		goto error;
	}

	if (include_localremote) {
		/* remote tag*/
		remote_node = xmlNewChild(dialog_node, NULL, BAD_CAST "remote", NULL) ;
		if( remote_node ==NULL)
		{
			LM_ERR("while adding child\n");
			goto error;
		}

		if (peer->len > MAX_URI_SIZE) {
			LM_ERR("peer '%.*s' too long, maximum=%d\n", peer->len, peer->s,
					MAX_URI_SIZE);
			goto error;
		}
		memcpy(buf, peer->s, peer->len);
		buf[peer->len]= '\0';

		tag_node = xmlNewChild(remote_node, NULL, BAD_CAST "identity",
				BAD_CAST buf) ;
		if( tag_node ==NULL)
		{
			LM_ERR("while adding child\n");
			goto error;
		}
		tag_node = xmlNewChild(remote_node, NULL, BAD_CAST "target", NULL);
		if( tag_node ==NULL)
		{
			LM_ERR("while adding child\n");
			goto error;
		}
		if (remotetarget && remotetarget->s) {
			memcpy(buf, remotetarget->s, remotetarget->len);
			buf[remotetarget->len]= '\0';
		}
		xmlNewProp(tag_node, BAD_CAST "uri", BAD_CAST buf);

		/* local tag*/
		local_node = xmlNewChild(dialog_node, NULL, BAD_CAST "local", NULL);
		if( local_node ==NULL)
		{
			LM_ERR("while adding child\n");
			goto error;
		}

		if (entity->len > MAX_URI_SIZE) {
			LM_ERR("entity '%.*s' too long, maximum=%d\n",
					entity->len, entity->s, MAX_URI_SIZE);
			goto error;
		}
		memcpy(buf, entity->s, entity->len);
		buf[entity->len]= '\0';

		tag_node = xmlNewChild(local_node, NULL, BAD_CAST "identity",
				BAD_CAST buf) ;
		if( tag_node ==NULL)
		{
			LM_ERR("while adding child\n");
			goto error;
		}
		tag_node = xmlNewChild(local_node, NULL, BAD_CAST "target", NULL);
		if( tag_node ==NULL)
		{
			LM_ERR("while adding child\n");
			goto error;
		}
		if (localtarget && localtarget->s) {
			memcpy(buf, localtarget->s, localtarget->len);
			buf[localtarget->len]= '\0';
		}
		xmlNewProp(tag_node, BAD_CAST "uri", BAD_CAST buf);
	}

	/* create the body */
	body = (str*)pkg_malloc(sizeof(str));
	if(body == NULL)
	{
		PKG_MEM_ERROR;
		goto error;
	}
	memset(body, 0, sizeof(str));

	xmlDocDumpFormatMemory(doc,(unsigned char**)(void*)&body->s,&body->len,1);

	if(body->s==NULL || body->len==0) {
		LM_ERR("failure formatting xml doc from memory or empty doc\n");
		goto error;
	}

	LM_DBG("new_body:\n%.*s\n", body->len, body->s);

	/*free the document */
	xmlFreeDoc(doc);
	xmlCleanupParser();

	return body;

error:
	if(body)
	{
		if(body->s)
			xmlFree(body->s);
		pkg_free(body);
	}
	if(doc) {
		xmlFreeDoc(doc);
		xmlCleanupParser();
	}

	return NULL;
}

void dialog_publish(char *state, str* ruri, str *entity, str *peer, str *callid,
		unsigned int initiator, unsigned int lifetime, str *localtag,
		str *remotetag, str *localtarget, str *remotetarget,
		unsigned short do_pubruri_localcheck)
{
	str* body= NULL;
	str uri= {NULL, 0};
	publ_info_t* publ= NULL;
	int size= 0;
	str content_type;
	struct sip_uri ruri_uri;


	if (parse_uri(ruri->s, ruri->len, &ruri_uri) < 0) {
		LM_ERR("failed to parse the PUBLISH R-URI\n");
		return;
	}

	if(do_pubruri_localcheck) {

		/* send PUBLISH only if the receiver PUBLISH R-URI is local*/
		if (!check_self(&(ruri_uri.host), 0, 0)) {
			LM_DBG("do not send PUBLISH to external URI %.*s\n",
					ruri->len, ruri->s);
			return;
		}

	}

	content_type.s= "application/dialog-info+xml";
	content_type.len= 27;

	body= build_dialoginfo(state, entity, peer, callid, initiator, localtag,
			remotetag, localtarget, remotetarget);
	if(body == NULL || body->s == NULL)
		goto error;

	LM_DBG("publish uri= %.*s\n", ruri->len, ruri->s);

	size= sizeof(publ_info_t)
		+ sizeof(str) 			/* *pres_uri */
		+ ( ruri->len 		/* pres_uri->s */
				+ callid->len + 16	/* id.s */
				+ content_type.len	/* content_type.s */
			)*sizeof(char);

	if(body)
		size+= sizeof(str)+ body->len* sizeof(char);

	publ= (publ_info_t*)pkg_malloc(size);
	if(publ== NULL)
	{
		PKG_MEM_ERROR;
		goto error;
	}
	memset(publ, 0, size);
	size= sizeof(publ_info_t);

	publ->pres_uri= (str*)((char*)publ + size);
	size+= sizeof(str);
	publ->pres_uri->s= (char*)publ+ size;
	memcpy(publ->pres_uri->s, ruri->s, ruri->len);
	publ->pres_uri->len= ruri->len;
	size+= ruri->len;

	if(body)
	{
		publ->body= (str*)( (char*)publ + size);
		size+= sizeof(str);

		publ->body->s= (char*)publ + size;
		memcpy(publ->body->s, body->s, body->len);
		publ->body->len= body->len;
		size+= body->len;
	}
	publ->id.s= (char*)publ+ size;
	memcpy(publ->id.s, "DIALOG_PUBLISH.", 15);
	memcpy(publ->id.s+15, callid->s, callid->len);
	publ->id.len= 15+ callid->len;
	size+= publ->id.len;

	publ->content_type.s= (char*)publ+ size;
	memcpy(publ->content_type.s, content_type.s, content_type.len);
	publ->content_type.len= content_type.len;
	size+= content_type.len;

	publ->expires= lifetime;

	/* make UPDATE_TYPE, as if this "publish dialog" is not found
	 * by pua it will fallback to INSERT_TYPE anyway */
	publ->flag|= UPDATE_TYPE;

	publ->source_flag|= DIALOG_PUBLISH;
	publ->event|= DIALOG_EVENT;
	publ->extra_headers= NULL;
	print_publ(publ);
	if(pua_send_publish(publ)< 0)
	{
		LM_ERR("while sending publish\n");
	}

error:

	if(publ)
		pkg_free(publ);

	if(body)
	{
		if(body->s)
			xmlFree(body->s);
		pkg_free(body);
	}

	if(uri.s)
		pkg_free(uri.s);

	return;
}



void dialog_publish_multi(char *state, struct str_list* ruris, str *entity,
		str *peer, str *callid, unsigned int initiator, unsigned int lifetime,
		str *localtag, str *remotetag,
		str *localtarget, str *remotetarget, unsigned short
		do_pubruri_localcheck)
{
	while(ruris) {
		LM_DBG("CALLING dialog_publish for URI %.*s\n",
				ruris->s.len, ruris->s.s);
		dialog_publish(state,&(ruris->s),entity,peer,callid,initiator,
				lifetime,localtag,remotetag,localtarget,remotetarget,
				do_pubruri_localcheck);
		ruris=ruris->next;
	}
}