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/*
	belle-sip - SIP (RFC3261) library.
    Copyright (C) 2012  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"
#include "belle-sip/refresher-helper.h"

struct belle_sip_refresher {
	belle_sip_object_t obj;
	belle_sip_refresher_listener_t listener;
	belle_sip_source_t* timer;
	belle_sip_client_transaction_t* transaction;
	int expires;
	unsigned int started;
	belle_sip_listener_callbacks_t listener_callbacks;
	void* user_data;
};

static void process_dialog_terminated(void *sal, const belle_sip_dialog_terminated_event_t *event){
	/*belle_sip_dialog_t* dialog =  belle_sip_dialog_terminated_get_dialog(event);*/
	belle_sip_fatal("Refresher process_dialog_terminated not implemented yet");
}
static void process_io_error(void *user_ctx, const belle_sip_io_error_event_t *event){
	belle_sip_fatal("Refresher process_io_error not implemented yet");
}

static int set_expires_from_trans(belle_sip_refresher_t* refresher);
static int refresh(belle_sip_refresher_t* refresher);
static int timer_cb(void *user_data, unsigned int events) ;

static void schedule_timer(belle_sip_refresher_t* refresher) {
	if (refresher->expires>0) {
		refresher->timer=belle_sip_timeout_source_new(timer_cb,refresher,refresher->expires);
		belle_sip_object_set_name((belle_sip_object_t*)refresher->timer,"Refresher timeout");
		belle_sip_main_loop_add_source(belle_sip_stack_get_main_loop(refresher->transaction->base.provider->stack),refresher->timer);
	}
}

static void process_response_event(void *user_ctx, const belle_sip_response_event_t *event){
	belle_sip_client_transaction_t* client_transaction = belle_sip_response_event_get_client_transaction(event);
	belle_sip_response_t* response = belle_sip_response_event_get_response(event);
	int response_code = belle_sip_response_get_status_code(response);
	belle_sip_refresher_t* refresher=(belle_sip_refresher_t*)user_ctx;
	if (refresher && (client_transaction !=refresher->transaction))
		return; /*not for me*/

		/*handle authorization*/
		switch (response_code) {
		case 200: {
			/*great, success*/
			/*update expire if needed*/
			set_expires_from_trans(refresher);
			schedule_timer(refresher); /*re-arm timer*/
			break;
		}
		case 401:
		case 407:{
			refresh(refresher); /*authorization is spoosed to be available imediatly*/
			return;
		}
		default:
			break;
		}
		refresher->listener(refresher,refresher->user_data,response_code, belle_sip_response_get_reason_phrase(response));

}
static void process_timeout(void *user_ctx, const belle_sip_timeout_event_t *event) {
/*	belle_sip_client_transaction_t* client_transaction = belle_sip_timeout_event_get_client_transaction(event);
	SalOp* op = (SalOp*)belle_sip_transaction_get_application_data(BELLE_SIP_TRANSACTION(client_transaction));
	if (op->callbacks.process_timeout) {
		op->callbacks.process_timeout(op,event);
	} else*/ {
		belle_sip_fatal("Unhandled event timeout [%p]",event);
	}
}
static void process_transaction_terminated(void *user_ctx, const belle_sip_transaction_terminated_event_t *event) {
/*	belle_sip_client_transaction_t* client_transaction = belle_sip_transaction_terminated_event_get_client_transaction(event);
	SalOp* op = (SalOp*)belle_sip_transaction_get_application_data(client_transaction);
	if (op->calbacks.process_transaction_terminated) {
		op->calbacks.process_transaction_terminated(op,event);
	} else */{
		belle_sip_fatal("Unhandled transaction terminated [%p]",event);
	}
}

static void destroy(belle_sip_refresher_t *refresher){
	if (refresher->transaction) belle_sip_object_unref(refresher->transaction);
}
BELLE_SIP_DECLARE_NO_IMPLEMENTED_INTERFACES(belle_sip_refresher_t);

BELLE_SIP_INSTANCIATE_VPTR(belle_sip_refresher_t, belle_sip_object_t,destroy, NULL, NULL,FALSE);

void belle_sip_refresher_set_listener(belle_sip_refresher_t* refresher, belle_sip_refresher_listener_t listener,void* user_pointer) {
	refresher->listener=listener;
	refresher->user_data=user_pointer;
}

static int refresh(belle_sip_refresher_t* refresher) {

	belle_sip_request_t*old_request=belle_sip_transaction_get_request(BELLE_SIP_TRANSACTION(refresher->transaction));
	belle_sip_header_cseq_t* cseq=(belle_sip_header_cseq_t*)belle_sip_message_get_header(BELLE_SIP_MESSAGE(old_request),BELLE_SIP_CSEQ);
	belle_sip_dialog_t* dialog = belle_sip_transaction_get_dialog(BELLE_SIP_TRANSACTION(refresher->transaction));
	belle_sip_client_transaction_t* client_transaction;
	belle_sip_request_t* request;
	belle_sip_provider_t* prov=refresher->transaction->base.provider;
	if (!dialog) {
		/*inc cseq*/
		belle_sip_header_cseq_set_seq_number(cseq,belle_sip_header_cseq_get_seq_number(cseq)+1);
		request=old_request;
		/*remove auth headers*/
		belle_sip_message_remove_header(BELLE_SIP_MESSAGE(request),BELLE_SIP_AUTHORIZATION);
		belle_sip_message_remove_header(BELLE_SIP_MESSAGE(request),BELLE_SIP_PROXY_AUTHORIZATION);
		if (refresher->transaction->preset_route) {
			belle_sip_message_add_header(BELLE_SIP_MESSAGE(request),BELLE_SIP_HEADER(refresher->transaction->preset_route));
		}


	} else if (dialog && belle_sip_dialog_get_state(dialog)==BELLE_SIP_DIALOG_CONFIRMED) {
		request=belle_sip_dialog_create_request(dialog,belle_sip_request_get_method(old_request));
	} else {
		belle_sip_error("Unexpected dialog state [%s] for dialog [%p], cannot refresh [%s]"
				,belle_sip_dialog_state_to_string(belle_sip_dialog_get_state(dialog))
				,dialog
				,belle_sip_request_get_method(old_request));
		return -1;
	}
	client_transaction = belle_sip_provider_create_client_transaction(prov,request);
	client_transaction->base.is_internal=1;
	belle_sip_transaction_set_application_data(BELLE_SIP_TRANSACTION(client_transaction),refresher);
	belle_sip_provider_add_authorization(prov,request,client_transaction->base.last_response);
	/*update reference transaction for next refresh*/
	belle_sip_object_unref(refresher->transaction);
	refresher->transaction=client_transaction;

	if (belle_sip_client_transaction_send_request(client_transaction)) {
		belle_sip_error("Cannot send refresh method [%s] for refresher [%p]"
				,belle_sip_request_get_method(old_request)
				,refresher);
	return -1;
	}
	return 0;
}

static int timer_cb(void *user_data, unsigned int events) {
	belle_sip_refresher_t* refresher = (belle_sip_refresher_t*)user_data;
	return refresh(refresher);
}
/*return 0 if succeeded*/
static belle_sip_header_contact_t* get_matching_contact(const belle_sip_transaction_t* transaction) {
	belle_sip_request_t*request=belle_sip_transaction_get_request(transaction);
	belle_sip_response_t*response=transaction->last_response;
	const belle_sip_list_t* contact_header_list;
	belle_sip_header_contact_t* local_contact;
	/*we assume, there is only one contact in request*/
	local_contact= belle_sip_message_get_header_by_type(BELLE_SIP_MESSAGE(request),belle_sip_header_contact_t);
	local_contact= BELLE_SIP_HEADER_CONTACT(belle_sip_object_clone(BELLE_SIP_OBJECT(local_contact)));

	/*first fix contact using received/rport*/
	belle_sip_response_fix_contact(response,local_contact);

	/*now, we have a *NAT* aware contact*/
	contact_header_list = belle_sip_message_get_headers(BELLE_SIP_MESSAGE(response),BELLE_SIP_CONTACT);
	if (contact_header_list) {
		contact_header_list = belle_sip_list_find_custom((belle_sip_list_t*)contact_header_list
				,(belle_sip_compare_func)belle_sip_header_contact_equals
				, (const void*)local_contact);
		if (!contact_header_list) {
			char* contact_string=belle_sip_object_to_string(BELLE_SIP_OBJECT(local_contact));
			belle_sip_error("no matching contact for  [%s]",contact_string);
			belle_sip_free(contact_string);
			return NULL;
		} else {
			return BELLE_SIP_HEADER_CONTACT(contact_header_list->data);
		}
	} else {
		return NULL;
	}

}
static int set_expires_from_trans(belle_sip_refresher_t* refresher) {
	belle_sip_transaction_t* transaction = BELLE_SIP_TRANSACTION(refresher->transaction);
	belle_sip_response_t*response=transaction->last_response;
	belle_sip_request_t*request=belle_sip_transaction_get_request(transaction);
	belle_sip_header_expires_t* expires_header;
	refresher->expires=-1;
	belle_sip_header_contact_t* contact_header;
	if (strcmp("REGISTER",belle_sip_request_get_method(request))==0
			|| strcmp("SUBSCRIBE",belle_sip_request_get_method(request))==0) {

		/*An "expires" parameter on the "Contact" header has no semantics for
		*   SUBSCRIBE and is explicitly not equivalent to an "Expires" header in
		*  a SUBSCRIBE request or response.
		*/
		if (strcmp("REGISTER",belle_sip_request_get_method(request))==0 && (contact_header=get_matching_contact(transaction)))  {
			refresher->expires=belle_sip_header_contact_get_expires(BELLE_SIP_HEADER_CONTACT(contact_header));
			belle_sip_object_unref(contact_header);
			contact_header=NULL;
		} else {
			/*no contact with expire or not relevant, looking for Expires header*/
			if ((expires_header=(belle_sip_header_expires_t*)belle_sip_message_get_header(BELLE_SIP_MESSAGE(response),BELLE_SIP_EXPIRES))) {
				refresher->expires = belle_sip_header_expires_get_expires(expires_header);
			}
		}
		if (refresher->expires<0) {
			belle_sip_message("Neither Expires header nor corresponding Contact header found");
			refresher->expires=0;
			return 1;
		}

	} 	else if (strcmp("INVITE",belle_sip_request_get_method(request))==0) {
		belle_sip_fatal("Refresher does not support ERROR yet");
	} else {
		belle_sip_error("Refresher does not support [%s] yet",belle_sip_request_get_method(request));
		return 1;
	}
	return 0;
}


int belle_sip_refresher_start(belle_sip_refresher_t* refresher) {
	if(refresher->started) {
		belle_sip_warning("Refresher[%p] already started",refresher);
	} else {
		if (refresher->expires>0) {
			schedule_timer(refresher);
			belle_sip_message("Refresher [%p] started, next refresh in [%i] s",refresher,refresher->expires);
		}
	}
	return 0;
}

void belle_sip_refresher_stop(belle_sip_refresher_t* refresher) {
	if (refresher->timer)
		belle_sip_main_loop_cancel_source(belle_sip_stack_get_main_loop(refresher->transaction->base.provider->stack),refresher->timer->id);
	refresher->timer=NULL;
}
belle_sip_refresher_t* belle_sip_refresher_new(belle_sip_client_transaction_t* transaction) {

	if (belle_sip_transaction_get_state(BELLE_SIP_TRANSACTION(transaction)) != BELLE_SIP_TRANSACTION_COMPLETED) {
		belle_sip_error("Invalid state [%s] for transaction [%p], should be BELLE_SIP_TRANSACTION_COMPLETED"
					,belle_sip_transaction_state_to_string(belle_sip_transaction_get_state(BELLE_SIP_TRANSACTION(transaction)))
					,transaction);
		return NULL;
	}
	belle_sip_refresher_t* refresher = (belle_sip_refresher_t*)belle_sip_object_new(belle_sip_refresher_t);
	refresher->transaction=transaction;
	belle_sip_object_ref(transaction);
	refresher->listener_callbacks.process_response_event=process_response_event;
	refresher->listener_callbacks.process_timeout=process_timeout;
	refresher->listener_callbacks.process_io_error=process_io_error;
	refresher->listener_callbacks.process_dialog_terminated=process_dialog_terminated;
	refresher->listener_callbacks.process_transaction_terminated=process_transaction_terminated;
	belle_sip_provider_add_internal_sip_listener(transaction->base.provider,belle_sip_listener_create_from_callbacks(&(refresher->listener_callbacks),refresher));
	if (set_expires_from_trans(refresher)){
		belle_sip_error("Unable to extract refresh value from transaction [%p]",transaction);
	}
	return refresher;
}