/* VTY interface for A-bis OM2000 */

/* (C) 2010-2018 by Harald Welte <laforge@gnumonks.org>
 *
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <stdint.h>

#include <arpa/inet.h>

#include <osmocom/bsc/gsm_data.h>
#include <osmocom/core/msgb.h>
#include <osmocom/gsm/tlv.h>
#include <osmocom/core/talloc.h>
#include <osmocom/bsc/debug.h>
#include <osmocom/bsc/signal.h>
#include <osmocom/bsc/abis_om2000.h>
#include <osmocom/bsc/vty.h>

#include <osmocom/vty/vty.h>
#include <osmocom/vty/command.h>
#include <osmocom/vty/logging.h>
#include <osmocom/vty/telnet_interface.h>

static struct cmd_node om2k_node = {
	OM2K_NODE,
	"%s(om2k)# ",
	1,
};

static struct cmd_node om2k_con_group_node = {
	OM2K_CON_GROUP_NODE,
	"%s(om2k-con-group)# ",
	1,
};

struct con_group;

struct oml_node_state {
	struct gsm_bts *bts;
	struct abis_om2k_mo mo;
	struct con_group *cg;
};

static int dummy_config_write(struct vty *v)
{
	return CMD_SUCCESS;
}

/* FIXME: auto-generate those strings from the value_string lists */
#define OM2K_OBJCLASS_VTY "(trxc|ts|tf|is|con|dp|cf|tx|rx)"
#define OM2K_OBJCLASS_VTY_HELP 	"TRX Controller\n"	\
				"Timeslot\n"		\
				"Timing Function\n"	\
				"Interface Switch\n"	\
				"Abis Concentrator\n"	\
				"Digital Path\n"	\
				"Central Function\n"	\
				"Transmitter\n"		\
				"Receiver\n"

DEFUN(om2k_class_inst, om2k_class_inst_cmd,
	"bts <0-255> om2000 class " OM2K_OBJCLASS_VTY
					" <0-255> <0-255> <0-255>",
	"BTS related commands\n" "BTS Number\n"
	"Manipulate the OM2000 managed objects\n"
	"Object Class\n" 	OM2K_OBJCLASS_VTY_HELP
	"BTS Number\n" "Associated SO Instance\n" "Instance Number\n")
{
	struct gsm_bts *bts;
	struct oml_node_state *oms;
	int bts_nr = atoi(argv[0]);

	bts = gsm_bts_num(gsmnet_from_vty(vty), bts_nr);
	if (!bts) {
		vty_out(vty, "%% No such BTS (%d)%s", bts_nr, VTY_NEWLINE);
		return CMD_WARNING;
	}

	if (bts->type != GSM_BTS_TYPE_RBS2000) {
		vty_out(vty, "%% BTS %d not an Ericsson RBS%s",
			bts_nr, VTY_NEWLINE);
		return CMD_WARNING;
	}

	oms = talloc_zero(tall_bsc_ctx, struct oml_node_state);
	if (!oms)
		return CMD_WARNING;

	oms->bts = bts;
	oms->mo.class = get_string_value(om2k_mo_class_short_vals, argv[1]);
	oms->mo.bts = atoi(argv[2]);
	oms->mo.assoc_so = atoi(argv[3]);
	oms->mo.inst = atoi(argv[4]);

	vty->index = oms;
	vty->node = OM2K_NODE;

	return CMD_SUCCESS;

}

DEFUN(om2k_classnum_inst, om2k_classnum_inst_cmd,
	"bts <0-255> om2000 class <0-255> <0-255> <0-255> <0-255>",
	"BTS related commands\n" "BTS Number\n"
	"Manipulate the OML managed objects\n"
	"Object Class\n" "Object Class\n"
	"BTS Number\n" "Associated SO Instance\n" "Instance Number\n")
{
	struct gsm_bts *bts;
	struct oml_node_state *oms;
	int bts_nr = atoi(argv[0]);

	bts = gsm_bts_num(gsmnet_from_vty(vty), bts_nr);
	if (!bts) {
		vty_out(vty, "%% No such BTS (%d)%s", bts_nr, VTY_NEWLINE);
		return CMD_WARNING;
	}

	oms = talloc_zero(tall_bsc_ctx, struct oml_node_state);
	if (!oms)
		return CMD_WARNING;

	oms->bts = bts;
	oms->mo.class = atoi(argv[1]);
	oms->mo.bts = atoi(argv[2]);
	oms->mo.assoc_so = atoi(argv[3]);
	oms->mo.inst = atoi(argv[4]);

	vty->index = oms;
	vty->node = OM2K_NODE;

	return CMD_SUCCESS;
}

DEFUN(om2k_reset, om2k_reset_cmd,
	"reset-command",
	"Reset the MO\n")
{
	struct oml_node_state *oms = vty->index;

	abis_om2k_tx_reset_cmd(oms->bts, &oms->mo);
	return CMD_SUCCESS;
}

DEFUN(om2k_start, om2k_start_cmd,
	"start-request",
	"Start the MO\n")
{
	struct oml_node_state *oms = vty->index;

	abis_om2k_tx_start_req(oms->bts, &oms->mo);
	return CMD_SUCCESS;
}

DEFUN(om2k_status, om2k_status_cmd,
	"status-request",
	"Get the MO Status\n")
{
	struct oml_node_state *oms = vty->index;

	abis_om2k_tx_status_req(oms->bts, &oms->mo);
	return CMD_SUCCESS;
}

DEFUN(om2k_connect, om2k_connect_cmd,
	"connect-command",
	"Connect the MO\n")
{
	struct oml_node_state *oms = vty->index;

	abis_om2k_tx_connect_cmd(oms->bts, &oms->mo);
	return CMD_SUCCESS;
}

DEFUN(om2k_disconnect, om2k_disconnect_cmd,
	"disconnect-command",
	"Disconnect the MO\n")
{
	struct oml_node_state *oms = vty->index;

	abis_om2k_tx_disconnect_cmd(oms->bts, &oms->mo);
	return CMD_SUCCESS;
}

DEFUN(om2k_enable, om2k_enable_cmd,
	"enable-request",
	"Enable the MO\n")
{
	struct oml_node_state *oms = vty->index;

	abis_om2k_tx_enable_req(oms->bts, &oms->mo);
	return CMD_SUCCESS;
}

DEFUN(om2k_disable, om2k_disable_cmd,
	"disable-request",
	"Disable the MO\n")
{
	struct oml_node_state *oms = vty->index;

	abis_om2k_tx_disable_req(oms->bts, &oms->mo);
	return CMD_SUCCESS;
}

DEFUN(om2k_op_info, om2k_op_info_cmd,
	"operational-info <0-1>",
	"Set operational information\n"
	"Set operational info to 0 or 1\n")
{
	struct oml_node_state *oms = vty->index;
	int oper = atoi(argv[0]);

	abis_om2k_tx_op_info(oms->bts, &oms->mo, oper);
	return CMD_SUCCESS;
}

DEFUN(om2k_test, om2k_test_cmd,
	"test-request",
	"Test the MO\n")
{
	struct oml_node_state *oms = vty->index;

	abis_om2k_tx_test_req(oms->bts, &oms->mo);
	return CMD_SUCCESS;
}

DEFUN(om2k_cap_req, om2k_cap_req_cmd,
	"capabilities-request",
	"Request MO capabilities\n")
{
	struct oml_node_state *oms = vty->index;

	abis_om2k_tx_cap_req(oms->bts, &oms->mo);
	return CMD_SUCCESS;
}

static struct con_group *con_group_find_or_create(struct gsm_bts *bts, uint8_t cg)
{
	struct con_group *ent;

	llist_for_each_entry(ent, &bts->rbs2000.con.conn_groups, list) {
		if (ent->cg == cg)
			return ent;
	}

	ent = talloc_zero(bts, struct con_group);
	ent->bts = bts;
	ent->cg = cg;
	INIT_LLIST_HEAD(&ent->paths);
	llist_add_tail(&ent->list, &bts->rbs2000.con.conn_groups);

	return ent;
}

static int con_group_del(struct gsm_bts *bts, uint8_t cg_id)
{
	struct con_group *cg, *cg2;

	llist_for_each_entry_safe(cg, cg2, &bts->rbs2000.con.conn_groups, list) {
		if (cg->cg == cg_id) {
			llist_del(&cg->list);
			talloc_free(cg);
			return 0;
		};
	}
	return -ENOENT;
}

static void con_group_add_path(struct con_group *cg, uint16_t ccp,
				uint8_t ci, uint8_t tag, uint8_t tei)
{
	struct con_path *cp = talloc_zero(cg, struct con_path);

	cp->ccp = ccp;
	cp->ci = ci;
	cp->tag = tag;
	cp->tei = tei;
	llist_add(&cp->list, &cg->paths);
}

static int con_group_del_path(struct con_group *cg, uint16_t ccp,
				uint8_t ci, uint8_t tag, uint8_t tei)
{
	struct con_path *cp, *cp2;
	llist_for_each_entry_safe(cp, cp2, &cg->paths, list) {
		if (cp->ccp == ccp && cp->ci == ci && cp->tag == tag &&
		    cp->tei == tei) {
			llist_del(&cp->list);
			talloc_free(cp);
			return 0;
		}
	}
	return -ENOENT;
}

DEFUN(cfg_om2k_con_group, cfg_om2k_con_group_cmd,
	"con-connection-group <1-31>",
	"Configure a CON (Concentrator) Connection Group\n"
	"CON Connection Group Number\n")
{
	struct gsm_bts *bts = vty->index;
	struct con_group *cg;
	uint8_t cgid = atoi(argv[0]);

	if (bts->type != GSM_BTS_TYPE_RBS2000) {
		vty_out(vty, "%% CON MO only exists in RBS2000%s",
			VTY_NEWLINE);
		return CMD_WARNING;
	}

	cg = con_group_find_or_create(bts, cgid);
	if (!cg) {
		vty_out(vty, "%% Cannot create CON Group%s",
			VTY_NEWLINE);
		return CMD_WARNING;
	}

	vty->node = OM2K_CON_GROUP_NODE;
	vty->index = cg;

	return CMD_SUCCESS;
}

DEFUN(del_om2k_con_group, del_om2k_con_group_cmd,
	"del-connection-group <1-31>",
	"Delete a CON (Concentrator) Connection Group\n"
	"CON Connection Group Number\n")
{
	struct gsm_bts *bts = vty->index;
	int rc;
	uint8_t cgid = atoi(argv[0]);

	if (bts->type != GSM_BTS_TYPE_RBS2000) {
		vty_out(vty, "%% CON MO only exists in RBS2000%s",
			VTY_NEWLINE);
		return CMD_WARNING;
	}

	rc = con_group_del(bts, cgid);
	if (rc != 0) {
		vty_out(vty, "%% Cannot delete CON Group%s",
			VTY_NEWLINE);
		return CMD_WARNING;
	}

	return CMD_SUCCESS;
}

#define CON_PATH_HELP	"CON Path (In/Out)\n"				\
			"Add CON Path to Concentration Group\n"		\
			"Delete CON Path from Concentration Group\n"	\
			"CON Conection Point\n"				\
			"Contiguity Index\n"				\

DEFUN(cfg_om2k_con_path_dec, cfg_om2k_con_path_dec_cmd,
	"con-path (add|del) <0-2047> <0-255> deconcentrated <0-63>",
	CON_PATH_HELP "De-concentrated in/outlet\n" "TEI Value\n")
{
	struct con_group *cg = vty->index;
	uint16_t ccp = atoi(argv[1]);
	uint8_t ci = atoi(argv[2]);
	uint8_t tei = atoi(argv[3]);

	if (!strcmp(argv[0], "add"))
		con_group_add_path(cg, ccp, ci, 0, tei);
	else {
		if (con_group_del_path(cg, ccp, ci, 0, tei) < 0) {
			vty_out(vty, "%% No matching CON Path%s",
				VTY_NEWLINE);
			return CMD_WARNING;
		}
	}

	return CMD_SUCCESS;
}

DEFUN(cfg_om2k_con_path_conc, cfg_om2k_con_path_conc_cmd,
	"con-path (add|del) <0-2047> <0-255> concentrated <1-16>",
	CON_PATH_HELP "Concentrated in/outlet\n" "Tag Number\n")
{
	struct con_group *cg = vty->index;
	uint16_t ccp = atoi(argv[1]);
	uint8_t ci = atoi(argv[2]);
	uint8_t tag = atoi(argv[3]);

	if (!strcmp(argv[0], "add"))
		con_group_add_path(cg, ccp, ci, tag, 0xff);
	else {
		if (con_group_del_path(cg, ccp, ci, tag, 0xff) < 0) {
			vty_out(vty, "%% No matching CON list entry%s",
				VTY_NEWLINE);
			return CMD_WARNING;
		}
	}

	return CMD_SUCCESS;
}

DEFUN(cfg_bts_alt_mode, cfg_bts_alt_mode_cmd,
	"abis-lower-transport (single-timeslot|super-channel)",
	"Configure thee Abis Lower Transport\n"
	"Single Timeslot (classic Abis)\n"
	"SuperChannel (Packet Abis)\n")
{
	struct gsm_bts *bts = vty->index;

	if (bts->type != GSM_BTS_TYPE_RBS2000) {
		vty_out(vty, "%% Command only works for RBS2000%s",
			VTY_NEWLINE);
		return CMD_WARNING;
	}

	if (!strcmp(argv[0], "super-channel"))
		bts->rbs2000.use_superchannel = 1;
	else
		bts->rbs2000.use_superchannel = 0;

	return CMD_SUCCESS;
}

DEFUN(cfg_bts_is_conn_list, cfg_bts_is_conn_list_cmd,
	"is-connection-list (add|del) <0-2047> <0-2047> <0-255>",
	"Interface Switch Connection List\n"
	"Add to IS list\n" "Delete from IS list\n"
	"ICP1\n" "ICP2\n" "Contiguity Index\n")
{
	struct gsm_bts *bts = vty->index;
	uint16_t icp1 = atoi(argv[1]);
	uint16_t icp2 = atoi(argv[2]);
	uint8_t ci = atoi(argv[3]);
	struct is_conn_group *grp, *grp2;

	if (bts->type != GSM_BTS_TYPE_RBS2000) {
		vty_out(vty, "%% IS MO only exists in RBS2000%s",
			VTY_NEWLINE);
		return CMD_WARNING;
	}

	if (!strcmp(argv[0], "add")) {
		grp = talloc_zero(bts, struct is_conn_group);
		grp->icp1 = icp1;
		grp->icp2 = icp2;
		grp->ci = ci;
		llist_add_tail(&grp->list, &bts->rbs2000.is.conn_groups);
	} else {
		llist_for_each_entry_safe(grp, grp2, &bts->rbs2000.is.conn_groups, list) {
			if (grp->icp1 == icp1 && grp->icp2 == icp2
			    && grp->ci == ci) {
				llist_del(&grp->list);
				talloc_free(grp);
				return CMD_SUCCESS;
			}
		}
		vty_out(vty, "%% No matching IS Conn Group found!%s",
			VTY_NEWLINE);
		return CMD_WARNING;
	}

	return CMD_SUCCESS;
}


DEFUN(om2k_conf_req, om2k_conf_req_cmd,
	"configuration-request",
	"Send the configuration request for current MO\n")
{
	struct oml_node_state *oms = vty->index;
	struct gsm_bts *bts = oms->bts;
	struct gsm_bts_trx *trx = NULL;
	struct gsm_bts_trx_ts *ts = NULL;

	switch (oms->mo.class) {
	case OM2K_MO_CLS_IS:
		abis_om2k_tx_is_conf_req(bts);
		break;
	case OM2K_MO_CLS_TS:
		trx = gsm_bts_trx_by_nr(bts, oms->mo.assoc_so);
		if (!trx) {
			vty_out(vty, "%% BTS %u has no TRX %u%s", bts->nr,
				oms->mo.assoc_so, VTY_NEWLINE);
			return CMD_WARNING;
		}
		if (oms->mo.inst >= ARRAY_SIZE(trx->ts)) {
			vty_out(vty, "%% Timeslot %u out of range%s",
				oms->mo.inst, VTY_NEWLINE);
			return CMD_WARNING;
		}
		ts = &trx->ts[oms->mo.inst];
		abis_om2k_tx_ts_conf_req(ts);
		break;
	case OM2K_MO_CLS_RX:
	case OM2K_MO_CLS_TX:
	case OM2K_MO_CLS_TRXC:
		trx = gsm_bts_trx_by_nr(bts, oms->mo.inst);
		if (!trx) {
			vty_out(vty, "%% BTS %u has no TRX %u%s", bts->nr,
				oms->mo.inst, VTY_NEWLINE);
			return CMD_WARNING;
		}
		switch (oms->mo.class) {
		case OM2K_MO_CLS_RX:
			abis_om2k_tx_rx_conf_req(trx);
			break;
		case OM2K_MO_CLS_TX:
			abis_om2k_tx_tx_conf_req(trx);
			break;
		default:
			break;
		}
		break;
	case OM2K_MO_CLS_TF:
		abis_om2k_tx_tf_conf_req(bts);
		break;
	default:
		vty_out(vty, "%% Don't know how to configure MO%s",
			VTY_NEWLINE);
	}

	return CMD_SUCCESS;
}

static void dump_con_group(struct vty *vty, struct con_group *cg)
{
	struct con_path *cp;

	llist_for_each_entry(cp, &cg->paths, list) {
		vty_out(vty, "   con-path add %u %u ", cp->ccp, cp->ci);
		if (cp->tei == 0xff) {
			vty_out(vty, "concentrated %u%s", cp->tag,
				VTY_NEWLINE);
		} else {
			vty_out(vty, "deconcentrated %u%s", cp->tei,
				VTY_NEWLINE);
		}
	}
}

void abis_om2k_config_write_bts(struct vty *vty, struct gsm_bts *bts)
{
	struct is_conn_group *igrp;
	struct con_group *cgrp;

	llist_for_each_entry(igrp, &bts->rbs2000.is.conn_groups, list)
		vty_out(vty, "  is-connection-list add %u %u %u%s",
			igrp->icp1, igrp->icp2, igrp->ci, VTY_NEWLINE);

	llist_for_each_entry(cgrp, &bts->rbs2000.con.conn_groups, list) {
		vty_out(vty, "  con-connection-group %u%s", cgrp->cg,
			VTY_NEWLINE);
		dump_con_group(vty, cgrp);
	}
	if (bts->rbs2000.use_superchannel)
		vty_out(vty, "  abis-lower-transport super-channel%s",
			VTY_NEWLINE);
}

int abis_om2k_vty_init(void)
{
	install_element(ENABLE_NODE, &om2k_class_inst_cmd);
	install_element(ENABLE_NODE, &om2k_classnum_inst_cmd);
	install_node(&om2k_node, dummy_config_write);

	install_element(OM2K_NODE, &om2k_reset_cmd);
	install_element(OM2K_NODE, &om2k_start_cmd);
	install_element(OM2K_NODE, &om2k_status_cmd);
	install_element(OM2K_NODE, &om2k_connect_cmd);
	install_element(OM2K_NODE, &om2k_disconnect_cmd);
	install_element(OM2K_NODE, &om2k_enable_cmd);
	install_element(OM2K_NODE, &om2k_disable_cmd);
	install_element(OM2K_NODE, &om2k_op_info_cmd);
	install_element(OM2K_NODE, &om2k_test_cmd);
	install_element(OM2K_NODE, &om2k_cap_req_cmd);
	install_element(OM2K_NODE, &om2k_conf_req_cmd);

	install_node(&om2k_con_group_node, dummy_config_write);
	install_element(OM2K_CON_GROUP_NODE, &cfg_om2k_con_path_dec_cmd);
	install_element(OM2K_CON_GROUP_NODE, &cfg_om2k_con_path_conc_cmd);

	install_element(BTS_NODE, &cfg_bts_is_conn_list_cmd);
	install_element(BTS_NODE, &cfg_bts_alt_mode_cmd);
	install_element(BTS_NODE, &cfg_om2k_con_group_cmd);
	install_element(BTS_NODE, &del_om2k_con_group_cmd);

	return 0;
}
