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/*
	belle-sip - SIP (RFC3261) library.
    Copyright (C) 2010  Belledonne Communications SARL

    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 3 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, see <http://www.gnu.org/licenses/>.
*/


#include "belle_sip_internal.h"

static void nict_destroy(belle_sip_nict_t *obj){
}

static int nict_on_timer_K(belle_sip_nict_t *obj){
	belle_sip_transaction_terminate((belle_sip_transaction_t*)obj);
	return BELLE_SIP_STOP;
}

static void nict_set_completed(belle_sip_nict_t *obj){
	belle_sip_transaction_t *base=(belle_sip_transaction_t*)obj;
	const belle_sip_timer_config_t *cfg=belle_sip_transaction_get_timer_config(base);
	base->state=BELLE_SIP_TRANSACTION_COMPLETED;
	if (obj->timer_K) belle_sip_fatal("Should never happen.");
	
	obj->timer_K=belle_sip_timeout_source_new((belle_sip_source_func_t)nict_on_timer_K,obj,
		                     belle_sip_channel_is_reliable(base->channel) ? 0 : cfg->T4);
	/*comment: we can indeed setup a timer to fire in 0 seconds so that the process_response notification arrives before
	 * the transaction_terminated notification*/
	belle_sip_transaction_start_timer(base,obj->timer_K);
}

static int nict_on_response(belle_sip_nict_t *obj, belle_sip_response_t *resp){
	belle_sip_transaction_t *base=(belle_sip_transaction_t*)obj;
	int code=belle_sip_response_get_status_code(resp);
	int pass=0; /*whether response should be passed to upper layer*/
	
	switch(base->state){
		case BELLE_SIP_TRANSACTION_TRYING:
			if (code<200){
				base->state=BELLE_SIP_TRANSACTION_PROCEEDING;
				pass=1;
			}
			else {
				nict_set_completed(obj);
				pass=1;
			}
		break;
		case BELLE_SIP_TRANSACTION_PROCEEDING:
			if (code>=200){
				nict_set_completed(obj);
				pass=1;
			}
		break;
		default:
		break;
	}
	return pass;
}

static void nict_on_terminate(belle_sip_nict_t *obj){
	belle_sip_transaction_t *base=(belle_sip_transaction_t*)obj;
	if (obj->timer_F){
		belle_sip_transaction_stop_timer(base,obj->timer_F);
		belle_sip_object_unref(obj->timer_F);
		obj->timer_F=NULL;
	}
	if (obj->timer_E){
		belle_sip_transaction_stop_timer(base,obj->timer_E);
		belle_sip_object_unref(obj->timer_E);
		obj->timer_E=NULL;
	}
	if (obj->timer_K){
		belle_sip_transaction_stop_timer(base,obj->timer_K);
		belle_sip_object_unref(obj->timer_K);
		obj->timer_K=NULL;
	}
}

static int nict_on_timer_F(belle_sip_nict_t *obj){
	belle_sip_transaction_t *base=(belle_sip_transaction_t*)obj;
	switch (base->state){
		case BELLE_SIP_TRANSACTION_TRYING:
		case BELLE_SIP_TRANSACTION_PROCEEDING:
			belle_sip_transaction_notify_timeout(base);
			belle_sip_transaction_terminate(base);
		break;
		default:
		break;
	}
	return BELLE_SIP_STOP;
}

static int nict_on_timer_E(belle_sip_nict_t *obj){
	belle_sip_transaction_t *base=(belle_sip_transaction_t*)obj;
	const belle_sip_timer_config_t *cfg=belle_sip_transaction_get_timer_config(base);

	switch(base->state){
		case BELLE_SIP_TRANSACTION_TRYING:
		{
			/*reset the timer */
			unsigned int prev_timeout=belle_sip_source_get_timeout(obj->timer_E);
			belle_sip_source_set_timeout(obj->timer_E,MIN(2*prev_timeout,cfg->T2));
			belle_sip_channel_queue_message(base->channel,(belle_sip_message_t*)base->request);
		}
		break;
		case BELLE_SIP_TRANSACTION_PROCEEDING:
			belle_sip_source_set_timeout(obj->timer_E,cfg->T2);
			belle_sip_channel_queue_message(base->channel,(belle_sip_message_t*)base->request);
		break;
		default:
		break;
	}
	return BELLE_SIP_CONTINUE;
}

static void nict_send_request(belle_sip_nict_t *obj){
	belle_sip_transaction_t *base=(belle_sip_transaction_t*)obj;
	const belle_sip_timer_config_t *cfg=belle_sip_transaction_get_timer_config(base);
	
	base->state=BELLE_SIP_TRANSACTION_TRYING;
	obj->timer_F=belle_sip_timeout_source_new((belle_sip_source_func_t)nict_on_timer_F,obj,cfg->T1*64);
	belle_sip_transaction_start_timer(base,obj->timer_F);
	belle_sip_channel_queue_message(base->channel,(belle_sip_message_t*)base->request);
	
	if (!belle_sip_channel_is_reliable(base->channel)){
		obj->timer_E=belle_sip_timeout_source_new((belle_sip_source_func_t)nict_on_timer_E,obj,cfg->T1);
		belle_sip_transaction_start_timer(base,obj->timer_E);
	}
}

BELLE_SIP_DECLARE_NO_IMPLEMENTED_INTERFACES(belle_sip_nict_t);

BELLE_SIP_INSTANCIATE_CUSTOM_VPTR(belle_sip_nict_t)={
	{
		{
			{
				BELLE_SIP_VPTR_INIT(belle_sip_nict_t,belle_sip_client_transaction_t,FALSE),
				(belle_sip_object_destroy_t)nict_destroy,
				NULL,
				NULL
			},
			(void (*)(belle_sip_transaction_t *))nict_on_terminate
		},
		(void (*)(belle_sip_client_transaction_t*))nict_send_request,
		(int (*)(belle_sip_client_transaction_t*,belle_sip_response_t*))nict_on_response
	}
};


belle_sip_nict_t *belle_sip_nict_new(belle_sip_provider_t *prov, belle_sip_request_t *req){
	belle_sip_nict_t *obj=belle_sip_object_new(belle_sip_nict_t);
	belle_sip_client_transaction_init((belle_sip_client_transaction_t*)obj,prov,req);
	return obj;
}