module PCU_Tests_NS {

/* Osmocom PCU test suite for IP Sub-Network-Service (SNS) in TTCN-3
 * (C) 2018-2019 Harald Welte <laforge@gnumonks.org>
 * All rights reserved.
 *
 * Released under the terms of GNU General Public License, Version 2 or
 * (at your option) any later version.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

import from General_Types all;
import from Osmocom_Types all;
import from PCU_Tests all;
import from SGSN_Components all;
import from Osmocom_Gb_Types all;
import from NS_CodecPort all;
import from NS_Types all;
import from BSSGP_Types all;
import from UD_Types all;
import from NS_CodecPort all;
import from NS_CodecPort_CtrlFunct all;
import from NS_Emulation all;
import from Native_Functions all;
import from IPL4asp_Types all;
import from PCUIF_Types all;
import from PCUIF_CodecPort all;
import from RAW_NS all;

modulepar {
	/* tolerate CellID absence/presence in BVC-RESET in violation to spec */
	boolean mp_tolerate_bvc_reset_cellid := false;
}

type component RAW_PCU_CT {
	/* PCUIF (we emulate the BTS part) */
	port PCUIF_CODEC_PT PCU;
	var ConnectionId g_pcu_conn_id := -1;
}

type component RAW_Test_CT extends RAW_NS_CT, RAW_PCU_CT {
}

function f_init_pcuif() runs on RAW_PCU_CT {
	var PCUIF_info_ind info_ind;
	map(self:PCU, system:PCU);


	info_ind := valueof(ts_PCUIF_INFO_default);

	/* Connect the Unix Domain Socket */
	g_pcu_conn_id := f_pcuif_listen(PCU, mp_pcu_sock_path);
	PCU.receive(UD_connected:?);

	/* Wait for PCU_VERSION and return INFO_IND */
	PCU.receive(t_SD_PCUIF(g_pcu_conn_id, tr_PCUIF_TXT_IND(0, PCU_VERSION, ?)));
	/* FIXME: make sure to use parameters from mp_gb_cfg.bvc[0].cell_id in the PCU INFO IND */
	var template PCUIF_Message info_ind_msg := ts_PCUIF_INFO_IND(0, info_ind);
	PCU.send(t_SD_PCUIF(g_pcu_conn_id, info_ind_msg));
}

function f_pcuif_tx(template (value) PCUIF_Message msg) runs on RAW_PCU_CT {
	PCU.send(t_SD_PCUIF(g_pcu_conn_id, msg));
}

/* ensure no matching message is received within 'tout' */
function f_ensure_no_ns(template PDU_NS ns := ?, integer idx := 0, float tout := 3.0)
runs on RAW_Test_CT {
	timer T := tout;
	T.start;
	alt {
	[] NSCP[idx].receive(t_NS_RecvFrom(ns)) {
		setverdict(fail, "NS-ALIVE from unconfigured (possibly initial) endpoint");
		}
	[] T.timeout {
		setverdict(pass);
		}
	}
}

/* test the NS-RESET procedure */
testcase TC_ns_reset() runs on RAW_Test_CT {
	f_init_ns_codec(mp_nsconfig);
	f_init_pcuif();


	/* Expect inbound NS-RESET procedure */
	as_rx_ns_reset_ack(oneshot := true);
	setverdict(pass);
}

/* ensure NS-RESET are re-transmitted */
testcase TC_ns_reset_retrans() runs on RAW_Test_CT {
	f_init_ns_codec(mp_nsconfig);
	f_init_pcuif();

	var integer i;
	for (i := 0; i < 3; i := i+1) {
		NSCP[0].receive(t_NS_RecvFrom(tr_NS_RESET(NS_CAUSE_OM_INTERVENTION,
							g_nsconfig[0].nsvci, g_nsconfig[0].nsei)));
	}

	/* Expect inbound NS-RESET procedure */
	as_rx_ns_reset_ack(oneshot := true);
	setverdict(pass);
}

/* test the inbound NS-ALIVE procedure after NS-RESET */
testcase TC_ns_alive() runs on RAW_Test_CT {
	f_init_ns_codec(mp_nsconfig);
	f_init_pcuif();

	/* Expect inbound NS-RESET procedure */
	as_rx_ns_reset_ack(oneshot := true);

	alt {
	/* wait for one ALIVE cycle, then ACK any further ALIVE in the background */
	[] NSCP[0].receive(t_NS_RecvFrom(t_NS_ALIVE)) { setverdict(pass); };
	[] NSCP[0].receive(t_NS_RecvFrom(t_NS_UNBLOCK)) { repeat; }
	}
}

/* Test for NS-RESET after NS-ALIVE timeout */
testcase TC_ns_alive_timeout_reset() runs on RAW_Test_CT {
	f_init_ns_codec(mp_nsconfig, guard_secs := 100.0);
	f_init_pcuif();

	/* Expect inbound NS-RESET procedure */
	as_rx_ns_reset_ack(oneshot := true);

	/* wait for at least one NS-ALIVE */
	alt {
	[] as_rx_alive_tx_ack(oneshot := true) { };
	[] NSCP[0].receive(t_NS_RecvFrom(t_NS_UNBLOCK)) { repeat; }
	}

	/* wait for NS-RESET to re-appear, ignoring any NS-ALIVE until then */
	alt {
	[] as_rx_ns_reset_ack(oneshot := true) { setverdict(pass); }
	[] NSCP[0].receive(t_NS_RecvFrom(t_NS_ALIVE)) { repeat; }
	[] NSCP[0].receive(t_NS_RecvFrom(t_NS_UNBLOCK)) { repeat; }
	}
}

/* test for NS-RESET/NS-ALIVE/NS-UNBLOCK */
testcase TC_ns_unblock() runs on RAW_Test_CT {
	f_init_ns_codec(mp_nsconfig);
	f_init_pcuif();

	/* Expect inbound NS-RESET procedure */
	as_rx_ns_reset_ack(oneshot := true);

	/* keep it alive */
	activate(as_rx_alive_tx_ack());

	as_rx_ns_unblock_ack(oneshot := true);
	setverdict(pass);
}

/* test for NS-UNBLOCK re-transmissions */
testcase TC_ns_unblock_retrans() runs on RAW_Test_CT {
	f_init_ns_codec(mp_nsconfig);
	f_init_pcuif();

	/* Expect inbound NS-RESET procedure */
	as_rx_ns_reset_ack(oneshot := true);

	/* keep it alive */
	activate(as_rx_alive_tx_ack());

	/* wait for first NS-UNBLOCK, don't respond */
	NSCP[0].receive(t_NS_RecvFrom(t_NS_UNBLOCK));

	/* wait for re-transmission of NS-UNBLOCK */
	as_rx_ns_unblock_ack(oneshot := true);
	setverdict(pass);
}

/* full bring-up of the Gb link for NS and BSSGP layer up to BVC-FC */
testcase TC_ns_full_bringup() runs on RAW_Test_CT {
	f_init_ns_codec(mp_nsconfig);
	f_init_pcuif();

	/* Expect inbound NS-RESET procedure */
	as_rx_ns_reset_ack(oneshot := true);

	/* keep it alive */
	activate(as_rx_alive_tx_ack());

	as_rx_ns_unblock_ack(oneshot := true);

	f_outgoing_ns_alive();

	/* Expect BVC-RESET for signaling (0) and ptp BVCI */
	if (mp_tolerate_bvc_reset_cellid) {
		as_rx_bvc_reset_tx_ack(0, mp_gb_cfg.bvc[0].cell_id, oneshot := true);
	} else {
		as_rx_bvc_reset_tx_ack(0, omit, oneshot := true);
	}
	as_rx_bvc_reset_tx_ack(mp_gb_cfg.bvc[0].bvci, mp_gb_cfg.bvc[0].cell_id, oneshot := true);
	as_rx_bvc_unblock_tx_ack(mp_gb_cfg.bvc[0].bvci, oneshot := true);

	/* wait for one FLOW-CONTROL BVC and then ACK any further in the future */
	as_rx_bvc_fc_tx_ack(mp_gb_cfg.bvc[0].bvci, oneshot := true);
	activate(as_rx_bvc_fc_tx_ack(mp_gb_cfg.bvc[0].bvci));
	setverdict(pass);
}

/* test outbound (SGSN-originated) NS-BLOCK procedure */
testcase TC_ns_so_block() runs on RAW_Test_CT {
	f_init_ns_codec(mp_nsconfig);
	f_init_pcuif();

	/* Expect inbound NS-RESET procedure */
	as_rx_ns_reset_ack(oneshot := true);

	/* keep it alive */
	activate(as_rx_alive_tx_ack());

	as_rx_ns_unblock_ack(oneshot := true);

	f_outgoing_ns_alive();

	f_outgoing_ns_block(NS_CAUSE_EQUIPMENT_FAILURE);
	setverdict(pass);
}


control {
	execute( TC_ns_reset() );
	execute( TC_ns_reset_retrans() );
	execute( TC_ns_alive() );
	execute( TC_ns_alive_timeout_reset() );
	execute( TC_ns_unblock() );
	execute( TC_ns_unblock_retrans() );
	execute( TC_ns_full_bringup() );
	execute( TC_ns_so_block() );
}

}