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/*****************************************************************************
			Eurecom OpenAirInterface 3
			Copyright(c) 2012 Eurecom

Source		nas_network.h

Version		0.1

Date		2012/09/20

Product		NAS stack

Subsystem	NAS main process

Author		Frederic Maurel

Description	NAS procedure functions triggered by the network

*****************************************************************************/

#include "nas_network.h"
#include "commonDef.h"
#include "nas_log.h"

#include "as_message.h"
#include "nas_proc.h"

/****************************************************************************/
/****************  E X T E R N A L    D E F I N I T I O N S  ****************/
/****************************************************************************/

/****************************************************************************/
/*******************  L O C A L    D E F I N I T I O N S  *******************/
/****************************************************************************/

/****************************************************************************/
/******************  E X P O R T E D    F U N C T I O N S  ******************/
/****************************************************************************/

/****************************************************************************
 **                                                                        **
 ** Name:	 nas_network_initialize()                                  **
 **                                                                        **
 ** Description: Initializes network internal data                         **
 **                                                                        **
 ** Inputs:	 None                                                      **
 ** 	 	 Others:	None                                       **
 **                                                                        **
 ** Outputs:	 None                                                      **
 **		 Return:	None                                       **
 ** 	 	 Others:	None                                       **
 **                                                                        **
 ***************************************************************************/
void nas_network_initialize(void)
{
    LOG_FUNC_IN;

#ifdef NAS_MME
    /* Initialize the internal NAS processing data */
    nas_proc_initialize();
#endif

    LOG_FUNC_OUT;
}

/****************************************************************************
 **                                                                        **
 ** Name:	 nas_network_cleanup()                                     **
 **                                                                        **
 ** Description: Performs clean up procedure before the system is shutdown **
 **                                                                        **
 ** Inputs:	 None                                                      **
 ** 	 	 Others:	None                                       **
 **                                                                        **
 ** Outputs:	 None                                                      **
 ** 		 Return:	None                                       **
 ** 	 	 Others:	None                                       **
 **                                                                        **
 ***************************************************************************/
void nas_network_cleanup(void)
{
    LOG_FUNC_IN;

    nas_proc_cleanup();

    LOG_FUNC_OUT;
}

/****************************************************************************
 **                                                                        **
 ** Name:	 nas_network_process_data()                                **
 **                                                                        **
 ** Description: Process Access Stratum messages received from the network **
 **		 and call applicable NAS procedure function.               **
 **                                                                        **
 ** Inputs:	 msg_id:	AS message identifier                      **
 ** 		 data:		Generic pointer to data structure that has **
 **				to be processed                            **
 ** 	 	 Others:	None                                       **
 **                                                                        **
 ** Outputs:	 None                                                      **
 **		 Return:	RETURNok if the message has been success-  **
 **				fully processed; RETURNerror otherwise     **
 ** 	 	 Others:	None                                       **
 **                                                                        **
 ***************************************************************************/
int nas_network_process_data(int msg_id, const void* data)
{
    LOG_FUNC_IN;

    const as_message_t* msg = (as_message_t*)(data);
    int rc = RETURNok;

    /* Sanity check */
    if (msg_id != msg->msgID) {
	LOG_TRACE(ERROR, "NET-MAIN  - Message identifier 0x%x to process "
		  "is different from that of the network data (0x%x)",
		  msg_id, msg->msgID);
	LOG_FUNC_RETURN (RETURNerror);
    }

    switch (msg_id)
    {
#ifdef NAS_UE
	case AS_BROADCAST_INFO_IND:
	    break;

	case AS_CELL_INFO_CNF:
	{
	    /* Received cell information confirm */
	    const cell_info_cnf_t* info = &msg->msg.cell_info_cnf;
	    int cell_found = (info->errCode == AS_SUCCESS);
	    rc = nas_proc_cell_info(cell_found, info->tac,
				    info->cellID, info->rat,
				    info->rsrp, info->rsrq);
	    break;
	}

	case AS_CELL_INFO_IND:
	    break;

	case AS_PAGING_IND:
	    break;

	case AS_NAS_ESTABLISH_CNF:
	{
	    /* Received NAS signalling connection establishment confirm */
	    const nas_establish_cnf_t* confirm = &msg->msg.nas_establish_cnf;
	    if ( (confirm->errCode == AS_SUCCESS) ||
		 (confirm->errCode == AS_TERMINATED_NAS) ) {
		rc = nas_proc_establish_cnf(confirm->nasMsg.data,
					    confirm->nasMsg.length);
	    }
	    else {
		LOG_TRACE(WARNING, "NET-MAIN  - "
			  "Initial NAS message not delivered");
		rc = nas_proc_establish_rej();
	    }
	    break;
	}

	case AS_NAS_RELEASE_IND:
	    /* Received NAS signalling connection releaase indication */
	    rc = nas_proc_release_ind(msg->msg.nas_release_ind.cause);
	    break;

	case AS_UL_INFO_TRANSFER_CNF:
	    /* Received uplink data transfer confirm */
	    if (msg->msg.ul_info_transfer_cnf.errCode != AS_SUCCESS) {
		LOG_TRACE(WARNING, "NET-MAIN  - "
			  "Uplink NAS message not delivered");
		rc = nas_proc_ul_transfer_rej();
	    }
	    else {
		rc = nas_proc_ul_transfer_cnf();
	    }
	    break;

	case AS_DL_INFO_TRANSFER_IND:
	{
	    const dl_info_transfer_ind_t* info = &msg->msg.dl_info_transfer_ind;
	    /* Received downlink data transfer indication */
	    rc = nas_proc_dl_transfer_ind(info->nasMsg.data,
	    				  info->nasMsg.length);
	    break;
	}

	case AS_RAB_ESTABLISH_IND:
	    break;

	case AS_RAB_RELEASE_IND:
	    break;
#endif
#ifdef NAS_MME
	case AS_NAS_ESTABLISH_IND:
	{
	    /* Received NAS signalling connection establishment indication */
	    const nas_establish_ind_t* indication = &msg->msg.nas_establish_ind;
	    rc = nas_proc_establish_ind(indication->UEid,
					indication->tac,
					indication->initialNasMsg.data,
					indication->initialNasMsg.length);
	    break;
	}

	case AS_DL_INFO_TRANSFER_CNF:
	{
	    const dl_info_transfer_cnf_t* info = &msg->msg.dl_info_transfer_cnf;
	    /* Received downlink data transfer confirm */
	    if (info->errCode != AS_SUCCESS) {
		LOG_TRACE(WARNING, "NET-MAIN  - "
			  "Downlink NAS message not delivered");
		rc = nas_proc_dl_transfer_rej(info->UEid);
	    }
	    else {
		rc = nas_proc_dl_transfer_cnf(info->UEid);
	    }
	    break;
	}

	case AS_UL_INFO_TRANSFER_IND:
	{
	    const ul_info_transfer_ind_t* info = &msg->msg.ul_info_transfer_ind;
	    /* Received uplink data transfer indication */
	    rc = nas_proc_ul_transfer_ind(info->UEid,
					  info->nasMsg.data,
					  info->nasMsg.length);
	    break;
	}

	case AS_RAB_ESTABLISH_CNF:
	    break;
#endif

	default:
            LOG_TRACE(ERROR, "NET-MAIN  - Unexpected AS message type: 0x%x",
		      msg_id);
	    rc = RETURNerror;
	    break;
    }

    LOG_FUNC_RETURN (rc);
}

/****************************************************************************/
/*********************  L O C A L    F U N C T I O N S  *********************/
/****************************************************************************/