/* 
 * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
 *
 * 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 
 */
#ifndef __PJSIP_SIMPLE_MWI_H__
#define __PJSIP_SIMPLE_MWI_H__

/**
 * @file mwi.h
 * @brief SIP Extension for MWI (RFC 3842)
 */
#include <pjsip-simple/evsub.h>
#include <pjsip/sip_msg.h>


PJ_BEGIN_DECL


/**
 * @defgroup mwi SIP Message Summary and Message Waiting Indication (RFC 3842)
 * @ingroup PJSIP_SIMPLE
 * @brief Support for SIP MWI Extension (RFC 3842)
 * @{
 *
 * This module implements RFC 3842: A Message Summary and Message Waiting
 * Indication Event Package for the Session Initiation Protocol (SIP).
 * It uses the SIP Event Notification framework (evsub.h) and extends the 
 * framework by implementing "message-summary" event package.
 */


/**
 * Initialize the MWI module and register it as endpoint module and
 * package to the event subscription module.
 *
 * @param endpt         The endpoint instance.
 * @param mod_evsub     The event subscription module instance.
 *
 * @return              PJ_SUCCESS if the module is successfully 
 *                      initialized and registered to both endpoint
 *                      and the event subscription module.
 */
PJ_DECL(pj_status_t) pjsip_mwi_init_module(pjsip_endpoint *endpt,
                                           pjsip_module *mod_evsub);

/**
 * Get the MWI module instance.
 *
 * @return              The MWI module instance.
 */
PJ_DECL(pjsip_module*) pjsip_mwi_instance(void);

/**
 * Create MWI client subscription session.
 *
 * @param dlg           The underlying dialog to use.
 * @param user_cb       Pointer to callbacks to receive MWI subscription
 *                      events.
 * @param options       Option flags. Currently only PJSIP_EVSUB_NO_EVENT_ID
 *                      is recognized.
 * @param p_evsub       Pointer to receive the MWI subscription
 *                      session.
 *
 * @return              PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_mwi_create_uac( pjsip_dialog *dlg,
                                           const pjsip_evsub_user *user_cb,
                                           unsigned options,
                                           pjsip_evsub **p_evsub );

/**
 * Create MWI server subscription session.
 *
 * @param dlg           The underlying dialog to use.
 * @param user_cb       Pointer to callbacks to receive MWI subscription
 *                      events.
 * @param rdata         The incoming SUBSCRIBE request that creates the event 
 *                      subscription.
 * @param p_evsub       Pointer to receive the MWI subscription
 *                      session.
 *
 * @return              PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_mwi_create_uas( pjsip_dialog *dlg,
                                           const pjsip_evsub_user *user_cb,
                                           pjsip_rx_data *rdata,
                                           pjsip_evsub **p_evsub );

/**
 * Forcefully destroy the MWI subscription. This function should only
 * be called on special condition, such as when the subscription 
 * initialization has failed. For other conditions, application MUST terminate
 * the subscription by sending the appropriate un(SUBSCRIBE) or NOTIFY.
 *
 * @param sub           The MWI subscription.
 * @param notify        Specify whether the state notification callback
 *                      should be called.
 *
 * @return              PJ_SUCCESS if subscription session has been destroyed.
 */
PJ_DECL(pj_status_t) pjsip_mwi_terminate( pjsip_evsub *sub,
                                          pj_bool_t notify );

/**
 * Call this function to create request to initiate MWI subscription, to 
 * refresh subcription, or to request subscription termination.
 *
 * @param sub           Client subscription instance.
 * @param expires       Subscription expiration. If the value is set to zero,
 *                      this will request unsubscription. If the value is
 *                      PJSIP_EXPIRES_NOT_SPECIFIED, default expiration
 *                      as defined by the package will be used.
 * @param p_tdata       Pointer to receive the request.
 *
 * @return              PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_mwi_initiate( pjsip_evsub *sub,
                                         pj_uint32_t expires,
                                         pjsip_tx_data **p_tdata);

/**
 * Accept the incoming subscription request by sending 2xx response to
 * incoming SUBSCRIBE request.
 *
 * @param sub           Server subscription instance.
 * @param rdata         The incoming subscription request message.
 * @param st_code       Status code, which MUST be final response.
 * @param hdr_list      Optional list of headers to be added in the response.
 *
 * @return              PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_mwi_accept( pjsip_evsub *sub,
                                       pjsip_rx_data *rdata,
                                       int st_code,
                                       const pjsip_hdr *hdr_list );

/**
 * For notifier, create NOTIFY request to subscriber, and set the state 
 * of the subscription. 
 *
 * @param sub           The server subscription (notifier) instance.
 * @param state         New state to set.
 * @param state_str     The state string name, if state contains value other
 *                      than active, pending, or terminated. Otherwise this
 *                      argument is ignored.
 * @param reason        Specify reason if new state is terminated, otherwise
 *                      put NULL.
 * @param mime_type     MIME type/content type of the message body.
 * @param body          Message body to be included in the NOTIFY request,
 *                      if NULL, the last body will be used. Note that
 *                      the mime_type must also be set when body is not NULL.
 * @param p_tdata       Pointer to receive the request.
 *
 * @return              PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_mwi_notify( pjsip_evsub *sub,
                                       pjsip_evsub_state state,
                                       const pj_str_t *state_str,
                                       const pj_str_t *reason,
                                       const pjsip_media_type *mime_type,
                                       const pj_str_t *body,
                                       pjsip_tx_data **p_tdata);

/**
 * Create NOTIFY request containing message body from the last NOITFY
 * message created.
 *
 * @param sub           Server subscription object.
 * @param p_tdata       Pointer to receive request.
 *
 * @return              PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_mwi_current_notify( pjsip_evsub *sub,
                                               pjsip_tx_data **p_tdata );


/**
 * Send request message that was previously created with initiate(), notify(),
 * or current_notify(). Application may also send request created with other
 * functions, e.g. authentication. But the request MUST be either request
 * that creates/refresh subscription or NOTIFY request.
 *
 * @param sub           The subscription object.
 * @param tdata         Request message to be sent.
 *
 * @return              PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_mwi_send_request( pjsip_evsub *sub,
                                             pjsip_tx_data *tdata );

/**
 * @}
 */

PJ_END_DECL


#endif  /* __PJSIP_SIMPLE_MWI_H__ */
