/*
 * $Id: imc.c 1808 2007-03-10 17:36:19Z bogdan_iancu $
 *
 * imc module - instant messaging conferencing implementation
 *
 * Copyright (C) 2006 Voice Sistem S.R.L.
 *
 * This file is part of openser, a free SIP server.
 *
 * openser 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
 *
 * openser 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:
 * ---------
 *  2006-10-06  first version (anca)
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include "../../db/db.h"
#include "../../db/db_res.h"
#include "../../sr_module.h"
#include "../../dprint.h"
#include "../../ut.h"
#include "../../timer.h"
#include "../../mem/shm_mem.h"
#include "../../db/db.h"
#include "../../parser/parse_from.h"
#include "../../parser/parse_content.h"
#include "../../parser/contact/parse_contact.h"
#include "../../resolve.h"
#include "../../hash_func.h"
#include "../../mi/mi.h"

#include "../tm/tm_load.h"


#include "imc_mng.h"
#include "imc_cmd.h"

MODULE_VERSION

/** parameters */

db_con_t *imc_db = NULL;
db_func_t imc_dbf;
str db_url = {0, 0};

char* rooms_table = "imc_rooms";
char* members_table = "imc_members";

imc_hentry_p _imc_htable = NULL;
int imc_hash_size = 4;
char *imc_cmd_start_str= IMC_CMD_START_STR;
char imc_cmd_start_char;

/** module functions */
static int mod_init(void);
static int child_init(int);

static int imc_manager(struct sip_msg*, char *, char *);

static struct mi_root* imc_mi_list_rooms(struct mi_root* cmd, void* param);
static struct mi_root* imc_mi_list_members(struct mi_root* cmd, void* param);

void destroy(void);

/** TM bind */
struct tm_binds tmb;

/** TM callback function */
void inv_callback( struct cell *t, int type, struct tmcb_params *ps);

static cmd_export_t cmds[]={
	{"imc_manager",  imc_manager, 0, 0, REQUEST_ROUTE},
	{0,0,0,0,0}
};


static param_export_t params[]={
	{"db_url",				STR_PARAM, &db_url.s},
	{"hash_size",			INT_PARAM, &imc_hash_size},
	{"imc_cmd_start_char",	STR_PARAM, &imc_cmd_start_str},
	{"rooms_table",			STR_PARAM, &rooms_table},
	{"members_table",		STR_PARAM, &members_table},
	{0,0,0}
};

#ifdef STATISTICS
#include "../../statistics.h"

stat_var* imc_active_rooms;

stat_export_t imc_stats[] = {
	{"active_rooms" ,  0,  &imc_active_rooms  },
	{0,0,0}
};

#endif

static mi_export_t mi_cmds[] = {
	{ "imc_list_rooms",    imc_mi_list_rooms,    MI_NO_INPUT_FLAG,  0,  0 },
	{ "imc_list_members",  imc_mi_list_members,  0,                 0,  0 },
	{ 0, 0, 0, 0, 0}
};



/** module exports */
struct module_exports exports= {
	"imc",      /* module name */
	DEFAULT_DLFLAGS, /* dlopen flags */
	cmds,       /* exported commands */
	params,     /* exported parameters */
#ifdef STATISTICS
	imc_stats,
#else
	0,          /* exported statistics */
#endif
	mi_cmds,    /* exported MI functions */
	0,          /* exported pseudo-variables */
	mod_init,   /* mod init */
	(response_function) 0,       /* response handler */
	(destroy_function) destroy,  /* destroy function */
	child_init  /* child init */
};

/**
 * the initiating function
 */
int add_from_db(void)
{
	imc_member_p member = NULL;
	int i, j, flag;
	db_key_t mq_result_cols[4], mquery_cols[2];
	db_key_t rq_result_cols[4];
	db_val_t mquery_vals[2];
	db_res_t *r_res= NULL;
	db_res_t *m_res= NULL;
	db_row_t *m_row = NULL, *r_row = NULL;	
	db_val_t *m_row_vals, *r_row_vals = NULL;
	str name, domain;
	imc_room_p room = NULL;
	int er_ret = -1;
	
	rq_result_cols[0] ="name";		
	rq_result_cols[1] ="domain";	
	rq_result_cols[2] ="flag";

	mq_result_cols[0] ="username";		
	mq_result_cols[1] ="domain";
	mq_result_cols[2] ="flag";

	mquery_cols[0] = "room";
	mquery_vals[0].type = DB_STR;
	mquery_vals[0].nul = 0;


	if(imc_dbf.use_table(imc_db, rooms_table)< 0)
	{
		LOG(L_ERR, "imc:mod_init:ERROR in use table\n");
		return -1;
	}

	if(imc_dbf.query(imc_db,0, 0, 0, rq_result_cols,0, 3, 0,&r_res)< 0)
	{
		LOG(L_ERR, "imc:mod_init:ERROR while querrying table\n");
		return -1;
	}
	if(r_res && r_res->n<=0)
	{
		LOG(L_INFO, "imc:mod_init:the query returned no result\n");
		imc_dbf.free_result(imc_db, r_res);
		r_res = NULL;
		return 0;
	}

	DBG("imc:mod_init: found %d rooms\n", r_res->n);

	for(i =0 ; i< r_res->n ; i++)
	{
		/*add rooms*/
		r_row = &r_res->rows[i];
		r_row_vals = ROW_VALUES(r_row);
	
		name.s = 	r_row_vals[0].val.str_val.s;
		name.len = strlen(name.s);
		
		domain.s = 	r_row_vals[1].val.str_val.s;
		domain.len = strlen(domain.s);
		
		flag = 	r_row_vals[2].val.int_val;
		
		room = imc_add_room(&name, &domain, flag);
		if(room == NULL)
		{
			LOG(L_ERR, "imc:mod_init:ERROR while adding room\n ");
			goto error;		
		}	
	
		/* add members */
		if(imc_dbf.use_table(imc_db, members_table)< 0)
		{
			LOG(L_ERR, "imc:mod_init:ERROR in use table\n ");
			goto error;
		}

		mquery_vals[0].val.str_val= room->uri;
		
		if(imc_dbf.query(imc_db, mquery_cols, 0, mquery_vals, mq_result_cols, 
					1, 3, 0, &m_res)< 0)
		{
			LOG(L_ERR, "imc:mod_init:ERROR while querrying table\n");
			goto error;
		}

		if(m_res && m_res->n <=0)
		{
			LOG(L_INFO, "imc:mod_init:the query returned no result\n");
			er_ret = 0;
			goto error; /* each room must have at least one member*/
		}
		for(j =0; j< m_res->n; j++)
		{
			m_row = &m_res->rows[j];
			m_row_vals = ROW_VALUES(m_row);
			
			name.s =m_row_vals[0].val.str_val.s;
			name.len = strlen(name.s);
			
			domain.s = 	m_row_vals[1].val.str_val.s;
			domain.len = strlen(domain.s);
			
			flag = 	m_row_vals[2].val.int_val	;
			
			DBG("imc:mod_init: Adding memeber: [name]=%.*s [domain]=%.*s"
					" in [room]= %.*s\n",name.len, name.s, domain.len,domain.s,
					room->uri.len, room->uri.s);

			member = imc_add_member(room, &name, &domain, flag);
			if(member == NULL)
			{
				LOG(L_ERR, "imc:mod_init:ERROR while adding member\n ");
				goto error;		
			}
			imc_release_room(room);	
		}

		if(m_res)
		{
			imc_dbf.free_result(imc_db, m_res);
			m_res = NULL;
		}

	}

	if(imc_dbf.use_table(imc_db, members_table)< 0)
	{
		LOG(L_ERR, "imc:mod_init:ERROR in use table\n ");
		goto error;
	}

	if(imc_dbf.delete(imc_db, 0, 0 , 0, 0) < 0)
	{
		LOG(L_ERR, "imc:mod_init:ERROR while deleting information from db\n");
		goto error;
	}
	
	if(imc_dbf.use_table(imc_db, rooms_table)< 0)
	{
		LOG(L_ERR, "imc:mod_init:ERROR in use table\n ");
		goto error;
	}

	if(imc_dbf.delete(imc_db, 0, 0 , 0, 0) < 0)
	{
		LOG(L_ERR, "imc:mod_init:ERROR while deleting information from db\n");
		goto error;
	}

	if(r_res)
	{	
		imc_dbf.free_result(imc_db, r_res);
		r_res = NULL;
	}
	if(m_res)
	{	
		imc_dbf.free_result(imc_db, m_res);
		m_res = NULL;
	}

	return 0;

error:

	if(r_res)
	{
		imc_dbf.free_result(imc_db, r_res);
		r_res = NULL;
	}
	if(m_res)
	{
		imc_dbf.free_result(imc_db, m_res);
		m_res = NULL;
	}
	if(room)
		imc_release_room(room);
	return er_ret;

}	


static int mod_init(void)
{
	DBG("imc: initializing ...\n");

	if(imc_hash_size<=0)
	{
		LOG(L_ERR, "imc:mod_init: error - invalid hash size\n");
		return -1;
	}

	imc_hash_size = 1<<imc_hash_size;

	if(imc_htable_init()<0)
	{
		LOG(L_ERR, "IMC:mod_init: error- initializing hash table\n");
		return -1;
	}

	if(imc_cmd_start_str == NULL)
		imc_cmd_start_str = "#";

	/*  binding to mysql module */	
	
	if(	db_url.s == NULL)
	{
		LOG(L_ERR, "imc:mod_init: ERROR no db url found\n");
		return -1;
	}

	db_url.len = db_url.s ? strlen(db_url.s) : 0;
	DBG("imc:mod_init: db_url=%s/%d/%p\n", ZSW(db_url.s), db_url.len, db_url.s);
	
	if (bind_dbmod(db_url.s, &imc_dbf))
	{
		DBG("imc:mod_init: ERROR: Database module not found\n");
		return -1;
	}

	imc_db = imc_dbf.init(db_url.s);
	if (!imc_db)
	{
		LOG(L_ERR,"imc:mod_init: Error while connecting database\n");
		return -1;
	}
	/* read the informations stored in db */
	if(add_from_db() <0)
	{
		LOG(L_ERR, "IMC:mod_init: error while getting information from db\n");
		return -1;
	}
	
	/* incarcare TM API */
	if (load_tm_api(&tmb)!=0) {
		LOG(L_ERR, "ERROR:imc:mod_init: error - unable to load tm api\n");
		return -1;
	}

	if(imc_cmd_start_str)
		imc_cmd_start_char = imc_cmd_start_str[0];
	
	if(imc_db)
		imc_dbf.close(imc_db);
	imc_db = NULL;
	
	return 0;
}

/**
 * child init
 */
static int child_init(int rank)
{
	if (imc_dbf.init==0)
	{
		LOG(L_CRIT, "imc: child_init: database not bound\n");
		return -1;
	}
	imc_db = imc_dbf.init(db_url.s);
	if (!imc_db)
	{
		LOG(L_ERR,"imc: child %d: Error while connecting database\n",
				rank);
		return -1;
	}
	else
	{
		if (imc_dbf.use_table(imc_db, rooms_table) < 0)  
		{
			LOG(L_ERR, "imc: child %d: Error in use_table %s\n", rank, 
					rooms_table);
			return -1;
		}
		if (imc_dbf.use_table(imc_db, members_table) < 0)  
		{
			LOG(L_ERR, "imc: child %d: Error in use_table %s\n", rank, 
					members_table);
			return -1;
		}

		DBG("imc: child %d: Database connection opened successfully\n", rank);
	}

	return 0;
}


static int imc_manager(struct sip_msg* msg, char *str1, char *str2)
{
	imc_cmd_t cmd;
	str body;
	struct sip_uri from_uri, *pto_uri=NULL, *pfrom_uri=NULL;
	struct to_body *pfrom;

	body.s = get_body( msg );
	if (body.s==0) 
	{
		LOG(L_ERR,"imc:imc_manager: error - cannot extract body from msg\n");
		goto error;
	}
	
	/* lungimea corpului mesajului */
	if (!msg->content_length) 
	{
		LOG(L_ERR,"imc:imc_manager: error - no Content-Length\n");
		goto error;
	}
	body.len = get_content_length( msg );

	if(body.len <= 0)
	{
		DBG("imc:imc_manager: empty body!\n");
		goto error;
	}

	if(parse_sip_msg_uri(msg)<0)
	{
		LOG(L_ERR,"imc:imc_manager: error - parsing r-uri\n");
		goto error;
	}
	
	pto_uri=&msg->parsed_uri;
	
	if(parse_from_header(msg)<0)
	{
		LOG(L_ERR,"imc:imc_manager: error - parsing From header\n");
		goto error;
	}
	pfrom = (struct to_body*)msg->from->parsed;	
	if(parse_uri(pfrom->uri.s, pfrom->uri.len, &from_uri)<0){
		LOG(L_ERR,"imc:imc_manager: error - parsing From URI\n");
		goto error;
	}
	pfrom_uri=&from_uri;

	if(body.s[0]== imc_cmd_start_char)
	{
		DBG("imc:imc_manager: found command\n");
		if(imc_parse_cmd(body.s, body.len, &cmd)<0)
		{
			LOG(L_ERR,"imc:imc_manager: error parsing imc cmd!\n");
			goto error;
		}

		switch(cmd.type)
		{
		case IMC_CMDID_CREATE:
			if(imc_handle_create(msg, &cmd, pfrom_uri, pto_uri)<0)
			{
				LOG(L_ERR, "imc:imc_manager: ERROR while handling 'create'\n");
				goto error;
			}
		break;
		case IMC_CMDID_JOIN:
			if(imc_handle_join(msg, &cmd, pfrom_uri, pto_uri)<0)
			{
				LOG(L_ERR, "imc:imc_manager: ERROR while handling 'join'\n");
				goto error;
			}
		break;
		case IMC_CMDID_INVITE:
			if(imc_handle_invite(msg, &cmd, pfrom_uri, pto_uri)<0)
			{
				LOG(L_ERR, "imc:imc_manager: ERROR while handling 'invite'\n");
				goto error;
			}
		break;
		case IMC_CMDID_ACCEPT:
			if(imc_handle_accept(msg, &cmd, pfrom_uri, pto_uri)<0)
			{
				LOG(L_ERR, "imc:imc_manager: ERROR while handling 'accept'\n");
				goto error;
			}
		break;
		case IMC_CMDID_DENY:
			if(imc_handle_deny(msg, &cmd, pfrom_uri, pto_uri)<0)
			{
				LOG(L_ERR, "imc:imc_manager: ERROR while handling 'deny'\n");
				goto error;
			}
		break;
		case IMC_CMDID_REMOVE:
			if(imc_handle_remove(msg, &cmd, pfrom_uri, pto_uri)<0)
			{
				LOG(L_ERR, "imc:imc_manager: ERROR while handling 'remove'\n");
				goto error;
			}
		break;
		case IMC_CMDID_EXIT:
			if(imc_handle_exit(msg, &cmd, pfrom_uri, pto_uri)<0)
			{
				LOG(L_ERR, "imc:imc_manager: ERROR while handling 'exit'\n");
				goto error;
			}
		break;
		case IMC_CMDID_LIST:
			if(imc_handle_list(msg, &cmd, pfrom_uri, pto_uri)<0)
			{
				LOG(L_ERR, "imc:imc_manager: ERROR while handling 'list'\n");
				goto error;
			}
		break;
		case IMC_CMDID_DESTROY:
			if(imc_handle_destroy(msg, &cmd, pfrom_uri, pto_uri)<0)
			{
				LOG(L_ERR, "imc:imc_manager: ERROR while handling 'destroy'\n");
				goto error;
			}
		break;
		case IMC_CMDID_HELP:
			if(imc_handle_help(msg, &cmd, &pfrom->uri,
			(msg->new_uri.s)?&msg->new_uri:&msg->first_line.u.request.uri)<0)
			{
				LOG(L_ERR, "imc:imc_manager: ERROR while handling 'help'\n");
				goto error;
			}
		break;
		default:
			if(imc_handle_unknown(msg, &cmd, &pfrom->uri,
			(msg->new_uri.s)?&msg->new_uri:&msg->first_line.u.request.uri)<0)
			{
				LOG(L_ERR, "imc:imc_manager: ERROR while handling 'unknown'\n");
				goto error;
			}
		}
									
		goto done;
	}

	if(imc_handle_message(msg, &body, pfrom_uri, pto_uri)<0)
	{
		LOG(L_ERR, "imc:imc_manager: ERROR while handling 'message'\n");
		goto error;
	}

done:
	return 1;

error:

	return -1;	
}

/**
 * destroy module
 */
void destroy(void)
{
	imc_room_p irp = NULL;
	imc_member_p member = NULL;
	int i;
	db_key_t mq_cols[4];
	db_val_t mq_vals[4];
	db_key_t rq_cols[4];
	db_val_t rq_vals[4];

	DBG("imc: destroy module ...\n");
	
	if(imc_db==NULL)
		goto done;

	mq_cols[0] ="username";
	mq_vals[0].type = DB_STR;
	mq_vals[0].nul = 0;
			
	mq_cols[1] ="domain";
	mq_vals[1].type = DB_STR;
	mq_vals[1].nul = 0;
	
	mq_cols[2] ="flag";
	mq_vals[2].type = DB_INT;
	mq_vals[2].nul = 0;

	mq_cols[3] ="room";
	mq_vals[3].type = DB_STR;
	mq_vals[3].nul = 0;


	rq_cols[0] ="name";
	rq_vals[0].type = DB_STR;
	rq_vals[0].nul = 0;
		
	rq_cols[1] ="domain";
	rq_vals[1].type = DB_STR;
	rq_vals[1].nul = 0;

	rq_cols[2] ="flag";
	rq_vals[2].type = DB_INT;
	rq_vals[2].nul = 0;

	for(i=0; i<imc_hash_size; i++) 
	{
		irp = _imc_htable[i].rooms;
		
		while(irp)
		{
			rq_vals[0].val.str_val = irp->name;
			rq_vals[1].val.str_val = irp->domain;
			rq_vals[2].val.int_val = irp->flags;

			if(imc_dbf.use_table(imc_db, rooms_table)< 0)
			{
				LOG(L_ERR, "imc:destroy: ERROR in use_table\n");
				return;
			}

			if(imc_dbf.insert(imc_db, rq_cols, rq_vals, 3)<0)
			{
				LOG(L_ERR, "imc:destroy: ERROR while inserting into table"
						" imc_rooms\n");
				return;
			}
			DBG("imc:destroy: room %d %.*s\n", i, irp->name.len, irp->name.s);
			member = irp->members;
			while(member)
			{
				mq_vals[0].val.str_val = member->user;
				mq_vals[1].val.str_val = member->domain;
				mq_vals[2].val.int_val = member->flags;
				mq_vals[3].val.str_val = irp->uri;

				if(imc_dbf.use_table(imc_db, members_table)< 0)
				{
					LOG(L_ERR, "imc:destroy: ERROR in use_table\n");
					return;
				}

				if(imc_dbf.insert(imc_db, mq_cols, mq_vals, 4)<0)
				{
					LOG(L_ERR, "imc:destroy: ERROR while inserting into table"
						" imc_rooms\n");
					return;
				}
				member = member->next;
			}
			irp = irp->next;
		}
	}

done:
	imc_htable_destroy();
}


/************************* MI ***********************/
static struct mi_root* imc_mi_list_rooms(struct mi_root* cmd_tree, void* param)
{
	int i, len;
	struct mi_root* rpl_tree= NULL;
	struct mi_node* rpl= NULL;
	struct mi_node* node= NULL;
	struct mi_attr* attr= NULL;
	imc_room_p irp = NULL;
	char* p = NULL;

	rpl_tree = init_mi_tree( 200, MI_OK_S, MI_OK_LEN);
	if(rpl_tree == NULL)
		return 0;
	rpl = &rpl_tree->node;

	for(i=0; i<imc_hash_size; i++) 
	{
		lock_get(&_imc_htable[i].lock);
		irp = _imc_htable[i].rooms;
			while(irp){
				node = add_mi_node_child(rpl, 0, "ROOM", 4, 0, 0);
				if( node == NULL)
					goto error;

				attr= add_mi_attr(node, MI_DUP_VALUE, "URI", 3, irp->uri.s,
					irp->uri.len);
				if(attr == NULL)
					goto error;

				p = int2str(irp->nr_of_members, &len);
				attr= add_mi_attr(node, 0, "MEMBERS", 7,p, len );
				if(attr == NULL)
					goto error;

				attr= add_mi_attr(node, MI_DUP_VALUE, "OWNER", 5, 
						irp->members->uri.s, irp->members->uri.len);
				if(attr == NULL)
					goto error;
					
				irp = irp->next;
			}
		lock_release(&_imc_htable[i].lock);
	}

	return rpl_tree;

error:
	lock_release(&_imc_htable[i].lock);
	free_mi_tree(rpl_tree);
	return 0;

}


static struct mi_root* imc_mi_list_members(struct mi_root* cmd_tree,
																void* param)
{
	int i, len;
	struct mi_root* rpl_tree = NULL;
	struct mi_node* node= NULL;
	struct mi_node* node_r= NULL;
	struct mi_attr* attr= NULL;
	char rnbuf[256];
	str room_name;
	imc_room_p room;
	struct sip_uri inv_uri, *pinv_uri;
	imc_member_p imp=NULL;
	char* p = NULL;

	node= cmd_tree->node.kids;
	if(node == NULL|| node->next!=NULL)
		return 0;
	
	/* room name */
	room_name.s = rnbuf;
	room_name.len= node->value.len;
	memcpy(room_name.s, node->value.s, node->value.len);
	if(room_name.s == NULL || room_name.len == 0)
	{
		LOG(L_ERR, "IMC:imc_mi_list_members: error - no room name!\n");
		return init_mi_tree( 404, "room name not found", 19);
	}
	rnbuf[room_name.len] = '\0';
	if(*room_name.s=='\0' || *room_name.s=='.')
	{
		LOG(L_INFO, "IMC:imc_mi_list_members: empty room name\n");
		return init_mi_tree( 400, "empty param", 11);
	}

	/* find room */
	parse_uri(room_name.s,room_name.len, &inv_uri);
	pinv_uri=&inv_uri;
	room=imc_get_room(&pinv_uri->user, &pinv_uri->host);

	if(room==NULL)
	{
		LOG(L_ERR,"IMC:imc_mi_list_members: no such room!\n");
		return init_mi_tree( 404, "no such room", 14);
	}

	rpl_tree = init_mi_tree( 200, MI_OK_S, MI_OK_LEN);
	if(rpl_tree == NULL)
		return 0;

	node_r = add_mi_node_child( &rpl_tree->node, MI_DUP_VALUE, "ROOM", 4,
		room_name.s, room_name.len);
	if(node_r == NULL)
		goto error;
	

	imp = room->members;
	i=0;
	while(imp)
	{
		i++;
		node = add_mi_node_child(node_r, MI_DUP_VALUE, "MEMBER",6, imp->uri.s,
			imp->uri.len);
		if(node == NULL)
			goto error;
		imp = imp->next;
	}
	
	p = int2str(i, &len);
	attr= add_mi_attr(node_r, MI_DUP_VALUE, "NR_OF_MEMBERS", 13, p, len);
	if(attr == 0)
		goto error;

	imc_release_room(room);

	return rpl_tree;

error:
	imc_release_room(room);
	free_mi_tree(rpl_tree);
	return 0;
}