/*
 * $Id: hash.c 2583 2007-08-08 11:33:25Z anca_vamanu $
 *
 * presence module - presence server implementation
 *
 * Copyright (C) 2007 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * History:
 * --------
 *  2007-08-20  initial version (anca)
 */

/*! \file
 * \brief Kamailio presence module
 * \ingroup presence 
 */

#include <stdio.h>
#include <stdlib.h>
#include "../../mem/shm_mem.h"
#include "../../dprint.h"
#include "../../str.h"
#include "../pua/hash.h"
#include "presence.h"
#include "hash.h"
#include "notify.h"

shtable_t new_shtable(int hash_size)
{
	shtable_t htable= NULL;
	int i, j;

	i = 0;
	htable= (subs_entry_t*)shm_malloc(hash_size* sizeof(subs_entry_t));
	if(htable== NULL)
	{
		ERR_MEM(SHARE_MEM);
	}
	memset(htable, 0, hash_size* sizeof(subs_entry_t));
	for(i= 0; i< hash_size; i++)
	{
		if(lock_init(&htable[i].lock)== 0)
		{
			LM_ERR("initializing lock [%d]\n", i);
			goto error;
		}
		htable[i].entries= (subs_t*)shm_malloc(sizeof(subs_t));
		if(htable[i].entries== NULL)
		{
			lock_destroy(&htable[i].lock);
			ERR_MEM(SHARE_MEM);
		}
		memset(htable[i].entries, 0, sizeof(subs_t));
		htable[i].entries->next= NULL;
	}

	return htable;

error:
	if(htable)
	{
		for(j=0; j< i; j++)
		{
			lock_destroy(&htable[j].lock);
			shm_free(htable[j].entries);
		}
		shm_free(htable);
	}
	return NULL;

}

void destroy_shtable(shtable_t htable, int hash_size)
{
	int i;

	if(htable== NULL)
		return;

	for(i= 0; i< hash_size; i++)
	{
		lock_destroy(&htable[i].lock);
		free_subs_list(htable[i].entries->next, SHM_MEM_TYPE, 1);
		shm_free(htable[i].entries);
	}
	shm_free(htable);
	htable= NULL;
}

subs_t* search_shtable(shtable_t htable,str callid,str to_tag,
		str from_tag,unsigned int hash_code)
{
	subs_t* s;

	s= htable[hash_code].entries->next;

	while(s)
	{
		if(s->callid.len==callid.len &&
				strncmp(s->callid.s, callid.s, callid.len)==0 &&
			s->to_tag.len== to_tag.len &&
				strncmp(s->to_tag.s, to_tag.s, to_tag.len)==0 &&
			s->from_tag.len== from_tag.len &&
				strncmp(s->from_tag.s, from_tag.s, from_tag.len)== 0)
			return s;
		s= s->next;
	}

	return NULL;
}

subs_t* mem_copy_subs(subs_t* s, int mem_type)
{
	int size;
	subs_t* dest;

	size= sizeof(subs_t)+ (s->pres_uri.len+ s->to_user.len
		+ s->to_domain.len+ s->from_user.len+ s->from_domain.len+ s->callid.len
		+ s->to_tag.len+ s->from_tag.len+s->sockinfo_str.len+s->event_id.len
		+ s->local_contact.len+ s->contact.len+ s->record_route.len+
		+ s->reason.len+ 1)*sizeof(char);

	if(mem_type & PKG_MEM_TYPE)
		dest= (subs_t*)pkg_malloc(size);
	else
		dest= (subs_t*)shm_malloc(size);

	if(dest== NULL)
	{
		ERR_MEM((mem_type==PKG_MEM_TYPE)?PKG_MEM_STR:SHARE_MEM);
	}
	memset(dest, 0, size);
	size= sizeof(subs_t);

	CONT_COPY(dest, dest->pres_uri, s->pres_uri)
	CONT_COPY(dest, dest->to_user, s->to_user)
	CONT_COPY(dest, dest->to_domain, s->to_domain)
	CONT_COPY(dest, dest->from_user, s->from_user)
	CONT_COPY(dest, dest->from_domain, s->from_domain)
	CONT_COPY(dest, dest->to_tag, s->to_tag)
	CONT_COPY(dest, dest->from_tag, s->from_tag)
	CONT_COPY(dest, dest->callid, s->callid)
	CONT_COPY(dest, dest->sockinfo_str, s->sockinfo_str)
	CONT_COPY(dest, dest->local_contact, s->local_contact)
	CONT_COPY(dest, dest->contact, s->contact)
	CONT_COPY(dest, dest->record_route, s->record_route)
	if(s->event_id.s)
		CONT_COPY(dest, dest->event_id, s->event_id)
	if(s->reason.s)
		CONT_COPY(dest, dest->reason, s->reason)

	dest->event= s->event;
	dest->local_cseq= s->local_cseq;
	dest->remote_cseq= s->remote_cseq;
	dest->status= s->status;
	dest->version= s->version;
	dest->send_on_cback= s->send_on_cback;
	dest->expires= s->expires;
	dest->db_flag= s->db_flag;

	return dest;

error:
	if(dest)
	{
		if(mem_type & PKG_MEM_TYPE)
			pkg_free(dest);
		else
			shm_free(dest);
	}
	return NULL;
}


subs_t* mem_copy_subs_noc(subs_t* s)
{
	int size;
	subs_t* dest;

	size= sizeof(subs_t)+ (s->pres_uri.len+ s->to_user.len
		+ s->to_domain.len+ s->from_user.len+ s->from_domain.len+ s->callid.len
		+ s->to_tag.len+ s->from_tag.len+s->sockinfo_str.len+s->event_id.len
		+ s->local_contact.len + s->record_route.len+
		+ s->reason.len+ 1)*sizeof(char);

	dest= (subs_t*)shm_malloc(size);
	if(dest== NULL)
	{
		ERR_MEM(SHARE_MEM);
	}
	memset(dest, 0, size);
	size= sizeof(subs_t);

	CONT_COPY(dest, dest->pres_uri, s->pres_uri)
	CONT_COPY(dest, dest->to_user, s->to_user)
	CONT_COPY(dest, dest->to_domain, s->to_domain)
	CONT_COPY(dest, dest->from_user, s->from_user)
	CONT_COPY(dest, dest->from_domain, s->from_domain)
	CONT_COPY(dest, dest->to_tag, s->to_tag)
	CONT_COPY(dest, dest->from_tag, s->from_tag)
	CONT_COPY(dest, dest->callid, s->callid)
	CONT_COPY(dest, dest->sockinfo_str, s->sockinfo_str)
	CONT_COPY(dest, dest->local_contact, s->local_contact)
	CONT_COPY(dest, dest->record_route, s->record_route)
	if(s->event_id.s)
		CONT_COPY(dest, dest->event_id, s->event_id)
	if(s->reason.s)
		CONT_COPY(dest, dest->reason, s->reason)

	dest->event= s->event;
	dest->local_cseq= s->local_cseq;
	dest->remote_cseq= s->remote_cseq;
	dest->status= s->status;
	dest->version= s->version;
	dest->send_on_cback= s->send_on_cback;
	dest->expires= s->expires;
	dest->db_flag= s->db_flag;

	dest->contact.s= (char*)shm_malloc(s->contact.len* sizeof(char));
	if(dest->contact.s== NULL)
	{
		ERR_MEM(SHARE_MEM);
	}
	memcpy(dest->contact.s, s->contact.s, s->contact.len);
	dest->contact.len= s->contact.len;

	return dest;

error:
	if(dest)
			shm_free(dest);
	return NULL;
}

int insert_shtable(shtable_t htable,unsigned int hash_code, subs_t* subs)
{
	subs_t* new_rec= NULL;

	new_rec= mem_copy_subs_noc(subs);
	if(new_rec== NULL)
	{
		LM_ERR("copying in share memory a subs_t structure\n");
		goto error;
	}

	new_rec->expires+= (int)time(NULL);
	new_rec->db_flag= INSERTDB_FLAG;

	lock_get(&htable[hash_code].lock);
	
	new_rec->next= htable[hash_code].entries->next;
	
	htable[hash_code].entries->next= new_rec;
	
	lock_release(&htable[hash_code].lock);
	
	return 0;

error:
	if(new_rec)
		shm_free(new_rec);
	return -1;
}

int delete_shtable(shtable_t htable,unsigned int hash_code,str to_tag)
{
	subs_t* s= NULL, *ps= NULL;
	int found= -1;

	lock_get(&htable[hash_code].lock);
	
	ps= htable[hash_code].entries;
	s= ps->next;
		
	while(s)
	{	
		if(s->to_tag.len== to_tag.len &&
				strncmp(s->to_tag.s, to_tag.s, to_tag.len)== 0)
		{
			found= s->local_cseq;
			ps->next= s->next;
			if(s->contact.s!=NULL)
				shm_free(s->contact.s);
			shm_free(s);
			break;
		}
		ps= s;
		s= s->next;
	}
	lock_release(&htable[hash_code].lock);
	return found;
}

void free_subs_list(subs_t* s_array, int mem_type, int ic)
{
	subs_t* s;

	while(s_array)
	{
		s= s_array;
		s_array= s_array->next;
		if(mem_type & PKG_MEM_TYPE)
		{
			if(ic)
				pkg_free(s->contact.s);
			pkg_free(s);
		}
		else
		{
			if(ic)
				shm_free(s->contact.s);
			shm_free(s);
		}
	}
	
}

int update_shtable(shtable_t htable,unsigned int hash_code, 
		subs_t* subs, int type)
{
	subs_t* s;

	lock_get(&htable[hash_code].lock);

	s= search_shtable(htable,subs->callid, subs->to_tag, subs->from_tag,
			hash_code);
	if(s== NULL)
	{
		LM_DBG("record not found in hash table\n");
		lock_release(&htable[hash_code].lock);
		return -1;
	}

	if(type & REMOTE_TYPE)
	{
		s->expires= subs->expires+ (int)time(NULL);
		s->remote_cseq= subs->remote_cseq;
	}
	else
	{
		subs->local_cseq= s->local_cseq;
		s->local_cseq++;	
		s->version= subs->version+ 1;
	}
	
	if(strncmp(s->contact.s, subs->contact.s, subs->contact.len))
	{
		shm_free(s->contact.s);
		s->contact.s= (char*)shm_malloc(subs->contact.len* sizeof(char));
		if(s->contact.s== NULL)
		{
			lock_release(&htable[hash_code].lock);
			LM_ERR("no more shared memory\n");
			return -1;
		}
		memcpy(s->contact.s, subs->contact.s, subs->contact.len);
		s->contact.len= subs->contact.len;
	}

	s->status= subs->status;
	s->event= subs->event;
	subs->db_flag= s->db_flag;

	if(s->db_flag & NO_UPDATEDB_FLAG)
		s->db_flag= UPDATEDB_FLAG;

	lock_release(&htable[hash_code].lock);
	
	return 0;
}

phtable_t* new_phtable(void)
{
	phtable_t* htable= NULL;
	int i, j;

	i = 0;
	htable= (phtable_t*)shm_malloc(phtable_size* sizeof(phtable_t));
	if(htable== NULL)
	{
		ERR_MEM(SHARE_MEM);
	}
	memset(htable, 0, phtable_size* sizeof(phtable_t));

	for(i= 0; i< phtable_size; i++)
	{
		if(lock_init(&htable[i].lock)== 0)
		{
			LM_ERR("initializing lock [%d]\n", i);
			goto error;
		}
		htable[i].entries= (pres_entry_t*)shm_malloc(sizeof(pres_entry_t));
		if(htable[i].entries== NULL)
		{
			ERR_MEM(SHARE_MEM);
		}
		memset(htable[i].entries, 0, sizeof(pres_entry_t));
		htable[i].entries->next= NULL;
	}

	return htable;

error:
	if(htable)
	{
		for(j=0; j< i; j++)
		{
			if(htable[i].entries)
				shm_free(htable[i].entries);
			else 
				break;
			lock_destroy(&htable[i].lock);
		}
		shm_free(htable);
	}
	return NULL;

}

void destroy_phtable(void)
{
	int i;
	pres_entry_t* p, *prev_p;

	if(pres_htable== NULL)
		return;

	for(i= 0; i< phtable_size; i++)
	{
		lock_destroy(&pres_htable[i].lock);
		p= pres_htable[i].entries;
		while(p)
		{
			prev_p= p;
			p= p->next;
			if(prev_p->sphere)
				shm_free(prev_p->sphere);
			shm_free(prev_p);
		}
	}
	shm_free(pres_htable);
}
/* entry must be locked before calling this function */

pres_entry_t* search_phtable(str* pres_uri,int event, unsigned int hash_code)
{
	pres_entry_t* p;

	LM_DBG("pres_uri= %.*s\n", pres_uri->len,  pres_uri->s);
	p= pres_htable[hash_code].entries->next;
	while(p)
	{
		if(p->event== event && p->pres_uri.len== pres_uri->len &&
				strncmp(p->pres_uri.s, pres_uri->s, pres_uri->len)== 0 )
			return p;
		p= p->next;
	}
	return NULL;
}

int insert_phtable(str* pres_uri, int event, char* sphere)
{
	unsigned int hash_code;
	pres_entry_t* p= NULL;
	int size;

	hash_code= core_hash(pres_uri, NULL, phtable_size);

	lock_get(&pres_htable[hash_code].lock);
	
	p= search_phtable(pres_uri, event, hash_code);
	if(p)
	{
		p->publ_count++;
		lock_release(&pres_htable[hash_code].lock);
		return 0;
	}
	size= sizeof(pres_entry_t)+ pres_uri->len* sizeof(char);

	p= (pres_entry_t*)shm_malloc(size);
	if(p== NULL)
	{
		lock_release(&pres_htable[hash_code].lock);
		ERR_MEM(SHARE_MEM);
	}
	memset(p, 0, size);

	size= sizeof(pres_entry_t);
	p->pres_uri.s= (char*)p+ size;
	memcpy(p->pres_uri.s, pres_uri->s, pres_uri->len);
	p->pres_uri.len= pres_uri->len;
	
	if(sphere)
	{
		p->sphere= (char*)shm_malloc((strlen(sphere)+ 1)*sizeof(char));
		if(p->sphere== NULL)
		{
			lock_release(&pres_htable[hash_code].lock);
			ERR_MEM(SHARE_MEM);
		}
		strcpy(p->sphere, sphere);
	}

	p->event= event;
	

	p->next= pres_htable[hash_code].entries->next;
	pres_htable[hash_code].entries->next= p;

	lock_release(&pres_htable[hash_code].lock);
	
	return 0;

error:
	return -1;
}

int delete_phtable(str* pres_uri, int event)
{
	unsigned int hash_code;
	pres_entry_t* p= NULL, *prev_p= NULL;

	hash_code= core_hash(pres_uri, NULL, phtable_size);

	lock_get(&pres_htable[hash_code].lock);
	
	p= search_phtable(pres_uri, event, hash_code);
	if(p== NULL)
	{
		LM_DBG("record not found\n");
		lock_release(&pres_htable[hash_code].lock);
		return 0;
	}
	
	p->publ_count--;
	if(p->publ_count== 0)
	{
		/* delete record */	
		prev_p= pres_htable[hash_code].entries;
		while(prev_p->next)
		{
			if(prev_p->next== p)
				break;
			prev_p= prev_p->next;
		}
		if(prev_p->next== NULL)
		{
			LM_ERR("record not found\n");
			lock_release(&pres_htable[hash_code].lock);
			return -1;
		}
		prev_p->next= p->next;
		if(p->sphere)
			shm_free(p->sphere);

		shm_free(p);
	}
	lock_release(&pres_htable[hash_code].lock);

	return 0;	
}

int update_phtable(presentity_t* presentity, str pres_uri, str body)
{
	char* sphere= NULL;
	unsigned int hash_code;
	pres_entry_t* p;
	int ret= 0;
	str* xcap_doc= NULL;

	/* get new sphere */
	sphere= extract_sphere(body);
	if(sphere==NULL)
	{
		LM_DBG("no sphere defined in new body\n");
		return 0;
	}

	/* search for record in hash table */
	hash_code= core_hash(&pres_uri, NULL, phtable_size);
	
	lock_get(&pres_htable[hash_code].lock);

	p= search_phtable(&pres_uri, presentity->event->evp->parsed, hash_code);
	if(p== NULL)
	{
		lock_release(&pres_htable[hash_code].lock);
		goto done;
	}
	
	if(p->sphere)
	{
		if(strcmp(p->sphere, sphere)!= 0)
		{
			/* new sphere definition */
			shm_free(p->sphere);
		}
		else
		{
			/* no change in sphere definition */
			lock_release(&pres_htable[hash_code].lock);
			pkg_free(sphere);
			return 0;
		}
	
	}


	p->sphere= (char*)shm_malloc((strlen(sphere)+ 1)*sizeof(char));
	if(p->sphere== NULL)
	{
		lock_release(&pres_htable[hash_code].lock);
		ret= -1;
		goto done;
	}
	strcpy(p->sphere, sphere);
		
	lock_release(&pres_htable[hash_code].lock);

	/* call for watchers status update */

	if(presentity->event->get_rules_doc(&presentity->user, &presentity->domain,
				&xcap_doc)< 0)
	{
		LM_ERR("failed to retreive xcap document\n");
		ret= -1;
		goto done;
	}

	update_watchers_status(pres_uri, presentity->event, xcap_doc);


done:

	if(xcap_doc)
	{
		if(xcap_doc->s)
			pkg_free(xcap_doc->s);
		pkg_free(xcap_doc);
	}

	if(sphere)
		pkg_free(sphere);
	return ret;
}