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/* Interface handler for Sysmocom L1 (forwarding) */

/* (C) 2011 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 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 <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <arpa/inet.h>

#include <osmocom/core/talloc.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/select.h>
#include <osmocom/core/write_queue.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/socket.h>
#include <osmocom/gsm/gsm_utils.h>

#include <osmo-bts/logging.h>
#include <osmo-bts/gsm_data.h>

#include <sysmocom/femtobts/femtobts.h>
#include <sysmocom/femtobts/gsml1prim.h>
#include <sysmocom/femtobts/gsml1const.h>
#include <sysmocom/femtobts/gsml1types.h>

#include "femtobts.h"
#include "l1_if.h"
#include "l1_transp.h"
#include "l1_fwd.h"

static const uint16_t fwd_udp_ports[] = {
	[MQ_SYS_READ]	= L1FWD_SYS_PORT,
	[MQ_L1_READ]	= L1FWD_L1_PORT,
	[MQ_DBG_READ]	= L1FWD_DBG_PORT,
};

static const struct value_string l1t_mq_names[] = {
	{ MQ_SYS_READ,	"SYS" },
	{ MQ_L1_READ,	"L1" },
	{ MQ_DBG_READ,	"DBG" },
	{ 0, NULL }
};

static int fwd_read_cb(struct osmo_fd *ofd)
{
	struct msgb *msg = msgb_alloc_headroom(2048, 127, "udp_rx");
	struct femtol1_hdl *fl1h = ofd->data;
	int rc;

	if (!msg)
		return -ENOMEM;

	msg->l1h = msg->data;
	rc = read(ofd->fd, msg->l1h, msgb_tailroom(msg));
	if (rc < 0) {
		LOGP(DL1C, LOGL_ERROR, "Short read from UDP\n");
		msgb_free(msg);
		return rc;
	} else if (rc == 0) {
		LOGP(DL1C, LOGL_ERROR, "Len=0 from UDP\n");
		msgb_free(msg);
		return rc;
	}
	msgb_put(msg, rc);

	switch (ofd->priv_nr) {
	case MQ_SYS_WRITE:
		rc = l1if_handle_sysprim(fl1h, msg);
		break;
	case MQ_L1_READ:
		rc = l1if_handle_l1prim(fl1h, msg);
		break;
	case MQ_DBG_READ:
		rc = l1if_handle_dbg(fl1h, msg);
		break;
	}

	return rc;
}

static int fwd_read_cb_bfd(struct osmo_fd *ofd, unsigned int what)
{
	if (what & BSC_FD_READ)
		return fwd_read_cb(ofd);

	return 0;
}

static int prim_write_cb(struct osmo_fd *ofd, struct msgb *msg)
{
	/* write to the fd */
	return write(ofd->fd, msg->head, msg->len);
}

int l1if_transport_open(struct femtol1_hdl *fl1h)
{
	int rc, i;
	char *bts_host = getenv("L1FWD_BTS_HOST");

	printf("sizeof(GsmL1_Prim_t) = %lu\n", sizeof(GsmL1_Prim_t));
	printf("sizeof(FemtoBts_Prim_t) = %lu\n", sizeof(FemtoBts_Prim_t));

	if (!bts_host) {
		fprintf(stderr, "You have to set the L1FWD_BTS_HOST environment variable\n");
		exit(2);
	}

	for (i = 0; i < ARRAY_SIZE(fl1h->write_q); i++) {
		struct osmo_wqueue *wq = &fl1h->write_q[i];
		struct osmo_fd *ofd = &wq->bfd;

		osmo_wqueue_init(wq, 10);
		wq->write_cb = prim_write_cb;
		wq->read_cb = fwd_read_cb;

		ofd->data = fl1h;
		ofd->priv_nr = i;
		ofd->when |= BSC_FD_READ;

		rc = osmo_sock_init_ofd(ofd, AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP,
					bts_host, fwd_udp_ports[i],
					OSMO_SOCK_F_CONNECT);
		if (rc < 0) {
			talloc_free(fl1h);
			return rc;
		}
	}
	/* special case: debug is read-only and has no write_q */
	i = MQ_DBG_READ;
	{
		struct osmo_fd *ofd = &fl1h->read_ofd[i];

		ofd->data = fl1h;
		ofd->priv_nr = i;
		ofd->when |= BSC_FD_READ;
		ofd->cb = fwd_read_cb_bfd;

		rc = osmo_sock_init_ofd(ofd, AF_UNSPEC, SOCK_DGRAM,
					IPPROTO_UDP, bts_host,
					fwd_udp_ports[i],
					OSMO_SOCK_F_CONNECT);
		if (rc < 0) {
			talloc_free(fl1h);
			return rc;
		}
	}

	return 0;
}

int l1if_transport_close(struct femtol1_hdl *fl1h)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(fl1h->write_q); i++) {
		struct osmo_wqueue *wq = &fl1h->write_q[i];
		struct osmo_fd *ofd = &wq->bfd;

		osmo_wqueue_clear(wq);
		osmo_fd_unregister(ofd);
		close(ofd->fd);
	}
	/* special case: debug is read-only and has no write_q */
	i = MQ_DBG_READ;
	{
		struct osmo_fd *ofd = &fl1h->read_ofd[i];

		osmo_fd_unregister(ofd);
		close(ofd->fd);
	}
	
	return 0;
}