/*
 *
 *  oFono - Open Source Telephony
 *
 *  Copyright (C) 2008-2011  Intel Corporation. All rights reserved.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  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, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <string.h>
#include <sys/socket.h>

#include <glib.h>
#include <gatchat.h>
#include <gattty.h>

#define OFONO_API_SUBJECT_TO_CHANGE
#include <ofono/plugin.h>
#include <ofono/log.h>
#include <ofono/modem.h>
#include <ofono/call-barring.h>
#include <ofono/call-forwarding.h>
#include <ofono/call-meter.h>
#include <ofono/call-settings.h>
#include <ofono/devinfo.h>
#include <ofono/message-waiting.h>
#include <ofono/netreg.h>
#include <ofono/phonebook.h>
#include <ofono/sim.h>
#include <ofono/gprs.h>
#include <ofono/gprs-context.h>
#include <ofono/sms.h>
#include <ofono/ussd.h>
#include <ofono/voicecall.h>

#include <drivers/atmodem/atutil.h>
#include <drivers/atmodem/vendor.h>

#include "bluez4.h"

static const char *none_prefix[] = { NULL };
static const char *rsen_prefix[]= { "#RSEN:", NULL };

struct telit_data {
	GAtChat *chat;		/* AT chat */
	GAtChat *modem;		/* Data port */
	struct ofono_sim *sim;
	ofono_bool_t have_sim;
	ofono_bool_t sms_phonebook_added;
	struct ofono_modem *sap_modem;
	GIOChannel *bt_io;
	GIOChannel *hw_io;
	guint bt_watch;
	guint hw_watch;
};

static void telit_debug(const char *str, void *user_data)
{
	const char *prefix = user_data;

	ofono_info("%s%s", prefix, str);
}

static void sap_close_io(struct ofono_modem *modem)
{
	struct telit_data *data = ofono_modem_get_data(modem);

	if (data->bt_io != NULL) {
		int sk = g_io_channel_unix_get_fd(data->bt_io);
		shutdown(sk, SHUT_RDWR);

		g_io_channel_unref(data->bt_io);
		data->bt_io = NULL;
	}

	if (data->bt_watch > 0)
		g_source_remove(data->bt_watch);

	g_io_channel_unref(data->hw_io);
	data->hw_io = NULL;

	if (data->hw_watch > 0)
		g_source_remove(data->hw_watch);
}

static void bt_watch_remove(gpointer userdata)
{
	struct ofono_modem *modem = userdata;
	struct telit_data *data = ofono_modem_get_data(modem);

	ofono_modem_set_powered(modem, FALSE);

	data->bt_watch = 0;
}

static gboolean bt_event_cb(GIOChannel *bt_io, GIOCondition condition,
							gpointer userdata)
{
	struct ofono_modem *modem = userdata;
	struct telit_data *data = ofono_modem_get_data(modem);

	if (condition & G_IO_IN) {
		GIOStatus status;
		gsize bytes_read, bytes_written;
		gchar buf[300];

		status = g_io_channel_read_chars(bt_io, buf, 300,
							&bytes_read, NULL);

		if (bytes_read > 0)
			g_io_channel_write_chars(data->hw_io, buf,
					bytes_read, &bytes_written, NULL);

		if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
			return FALSE;

		return TRUE;
	}

	return FALSE;
}

static void hw_watch_remove(gpointer userdata)
{
	struct ofono_modem *modem = userdata;
	struct telit_data *data = ofono_modem_get_data(modem);

	ofono_modem_set_powered(modem, FALSE);

	data->hw_watch = 0;
}

static gboolean hw_event_cb(GIOChannel *hw_io, GIOCondition condition,
							gpointer userdata)
{
	struct ofono_modem *modem = userdata;
	struct telit_data *data = ofono_modem_get_data(modem);

	if (condition & G_IO_IN) {
		GIOStatus status;
		gsize bytes_read, bytes_written;
		gchar buf[300];

		status = g_io_channel_read_chars(hw_io, buf, 300,
							&bytes_read, NULL);

		if (bytes_read > 0)
			g_io_channel_write_chars(data->bt_io, buf,
					bytes_read, &bytes_written, NULL);

		if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
			return FALSE;

		return TRUE;
	}

	return FALSE;
}

static GAtChat *open_device(struct ofono_modem *modem,
				const char *key, char *debug)
{
	const char *device;
	GAtSyntax *syntax;
	GIOChannel *channel;
	GAtChat *chat;
	GHashTable *options;

	device = ofono_modem_get_string(modem, key);
	if (device == NULL)
		return NULL;

	DBG("%s %s", key, device);

	options = g_hash_table_new(g_str_hash, g_str_equal);
	if (options == NULL)
		return NULL;

	g_hash_table_insert(options, "Baud", "115200");

	channel = g_at_tty_open(device, options);

	g_hash_table_destroy(options);

	if (channel == NULL)
		return NULL;

	syntax = g_at_syntax_new_gsmv1();
	chat = g_at_chat_new(channel, syntax);
	g_at_syntax_unref(syntax);
	g_io_channel_unref(channel);

	if (chat == NULL)
		return NULL;

	if (getenv("OFONO_AT_DEBUG"))
		g_at_chat_set_debug(chat, telit_debug, debug);

	return chat;
}

static void switch_sim_state_status(struct ofono_modem *modem, int status)
{
	struct telit_data *data = ofono_modem_get_data(modem);

	DBG("%p, SIM status: %d", modem, status);

	switch (status) {
	case 0:	/* SIM not inserted */
		if (data->have_sim == TRUE) {
			ofono_sim_inserted_notify(data->sim, FALSE);
			data->have_sim = FALSE;
			data->sms_phonebook_added = FALSE;
		}
		break;
	case 1:	/* SIM inserted */
	case 2:	/* SIM inserted and PIN unlocked */
		if (data->have_sim == FALSE) {
			ofono_sim_inserted_notify(data->sim, TRUE);
			data->have_sim = TRUE;
		}
		break;
	case 3:	/* SIM inserted, SMS and phonebook ready */
		if (data->sms_phonebook_added == FALSE) {
			ofono_phonebook_create(modem, 0, "atmodem", data->chat);
			ofono_sms_create(modem, 0, "atmodem", data->chat);
			data->sms_phonebook_added = TRUE;
		}
		break;
	default:
		ofono_warn("Unknown SIM state %d received", status);
		break;
	}
}

static void telit_qss_notify(GAtResult *result, gpointer user_data)
{
	struct ofono_modem *modem = user_data;
	int status;
	GAtResultIter iter;

	DBG("%p", modem);

	g_at_result_iter_init(&iter, result);

	if (!g_at_result_iter_next(&iter, "#QSS:"))
		return;

	g_at_result_iter_next_number(&iter, &status);

	switch_sim_state_status(modem, status);
}

static void cfun_enable_cb(gboolean ok, GAtResult *result, gpointer user_data)
{
	struct ofono_modem *modem = user_data;
	struct telit_data *data = ofono_modem_get_data(modem);
	struct ofono_modem *m = data->sap_modem ? : modem;

	DBG("%p", modem);

	if (!ok) {
		g_at_chat_unref(data->chat);
		data->chat = NULL;
		ofono_modem_set_powered(m, FALSE);
		sap_close_io(modem);
		return;
	}

	/*
	 * Switch data carrier detect signal off.
	 * When the DCD is disabled the modem does not hangup anymore
	 * after the data connection.
	 */
	g_at_chat_send(data->chat, "AT&C0", NULL, NULL, NULL, NULL);

	data->have_sim = FALSE;
	data->sms_phonebook_added = FALSE;

	ofono_modem_set_powered(m, TRUE);

	/*
	 * Tell the modem not to automatically initiate auto-attach
	 * proceedures on its own.
	 */
	g_at_chat_send(data->chat, "AT#AUTOATT=0", none_prefix,
				NULL, NULL, NULL);

	/* Follow sim state */
	g_at_chat_register(data->chat, "#QSS:", telit_qss_notify,
				FALSE, modem, NULL);

	/* Enable sim state notification */
	g_at_chat_send(data->chat, "AT#QSS=2", none_prefix, NULL, NULL, NULL);
}

static int telit_enable(struct ofono_modem *modem)
{
	struct telit_data *data = ofono_modem_get_data(modem);

	DBG("%p", modem);

	data->modem = open_device(modem, "Modem", "Modem: ");
	if (data->modem == NULL)
		return -EINVAL;

	data->chat = open_device(modem, "Aux", "Aux: ");
	if (data->chat == NULL) {
		g_at_chat_unref(data->modem);
		data->modem = NULL;
		return -EIO;
	}

	g_at_chat_set_slave(data->modem, data->chat);

	/*
	 * Disable command echo and
	 * enable the Extended Error Result Codes
	 */
	g_at_chat_send(data->chat, "ATE0 +CMEE=1", none_prefix,
				NULL, NULL, NULL);

	/*
	 * Disable sim state notification so that we sure get a notification
	 * when we enable it again later and don't have to query it.
	 */
	g_at_chat_send(data->chat, "AT#QSS=0", none_prefix, NULL, NULL, NULL);

	/* Set phone functionality */
	g_at_chat_send(data->chat, "AT+CFUN=4", none_prefix,
				cfun_enable_cb, modem, NULL);

	return -EINPROGRESS;
}

static void telit_rsen_notify(GAtResult *result, gpointer user_data)
{
	struct ofono_modem *modem = user_data;
	struct telit_data *data = ofono_modem_get_data(modem);
	int status;
	GAtResultIter iter;

	DBG("%p", modem);

	g_at_result_iter_init(&iter, result);

	if (!g_at_result_iter_next(&iter, "#RSEN:"))
		return;

	g_at_result_iter_next_number(&iter, &status);

	if (status == 0) {
		ofono_modem_set_powered(data->sap_modem, FALSE);
		sap_close_io(modem);
		return;
	}

	telit_enable(modem);
}

static void rsen_enable_cb(gboolean ok, GAtResult *result, gpointer user_data)
{
	struct ofono_modem *modem = user_data;
	struct telit_data *data = ofono_modem_get_data(modem);

	DBG("%p", modem);

	if (!ok) {
		ofono_modem_set_powered(data->sap_modem, FALSE);
		sap_close_io(modem);
		return;
	}
}

static void cfun_disable_cb(gboolean ok, GAtResult *result, gpointer user_data)
{
	struct ofono_modem *modem = user_data;
	struct telit_data *data = ofono_modem_get_data(modem);

	if(data->sap_modem)
		modem = data->sap_modem;

	DBG("%p", modem);

	g_at_chat_unref(data->chat);
	data->chat = NULL;

	if (ok)
		ofono_modem_set_powered(modem, FALSE);

	data->sap_modem = NULL;
}

static int telit_disable(struct ofono_modem *modem)
{
	struct telit_data *data = ofono_modem_get_data(modem);
	DBG("%p", modem);

	g_at_chat_cancel_all(data->modem);
	g_at_chat_unregister_all(data->modem);
	g_at_chat_unref(data->modem);
	data->modem = NULL;

	g_at_chat_cancel_all(data->chat);
	g_at_chat_unregister_all(data->chat);

	/* Power down modem */
	g_at_chat_send(data->chat, "AT+CFUN=0", none_prefix,
				cfun_disable_cb, modem, NULL);

	return -EINPROGRESS;
}

static void rsen_disable_cb(gboolean ok, GAtResult *result, gpointer user_data)
{
	struct ofono_modem *modem = user_data;

	DBG("%p", modem);

	sap_close_io(modem);

	telit_disable(modem);
}

static int telit_sap_open(void)
{
	const char *device = "/dev/ttyUSB4";
	struct termios ti;
	int fd;

	DBG("%s", device);

	fd = open(device, O_RDWR | O_NOCTTY | O_NONBLOCK);
	if (fd < 0)
		return -EINVAL;

	/* Switch TTY to raw mode */
	memset(&ti, 0, sizeof(ti));
	cfmakeraw(&ti);

	ti.c_cflag |= (B115200 | CLOCAL | CREAD);

	tcflush(fd, TCIOFLUSH);
	if (tcsetattr(fd, TCSANOW, &ti) < 0) {
		close(fd);
		return -EBADF;
	}

	return fd;
}

static int telit_sap_enable(struct ofono_modem *modem,
					struct ofono_modem *sap_modem,
					int bt_fd)
{
	struct telit_data *data = ofono_modem_get_data(modem);
	int fd;

	DBG("%p", modem);

	fd = telit_sap_open();
	if (fd < 0)
		goto error;

	data->hw_io = g_io_channel_unix_new(fd);
	if (data->hw_io == NULL) {
		close(fd);
		goto error;
	}

	g_io_channel_set_encoding(data->hw_io, NULL, NULL);
	g_io_channel_set_buffered(data->hw_io, FALSE);
	g_io_channel_set_close_on_unref(data->hw_io, TRUE);

	data->bt_io = g_io_channel_unix_new(bt_fd);
	if (data->bt_io == NULL)
		goto error;

	g_io_channel_set_encoding(data->bt_io, NULL, NULL);
	g_io_channel_set_buffered(data->bt_io, FALSE);
	g_io_channel_set_close_on_unref(data->bt_io, TRUE);

	data->hw_watch = g_io_add_watch_full(data->hw_io, G_PRIORITY_DEFAULT,
				G_IO_HUP | G_IO_ERR | G_IO_NVAL | G_IO_IN,
				hw_event_cb, modem, hw_watch_remove);

	data->bt_watch = g_io_add_watch_full(data->bt_io, G_PRIORITY_DEFAULT,
				G_IO_HUP | G_IO_ERR | G_IO_NVAL | G_IO_IN,
				bt_event_cb, modem, bt_watch_remove);

	data->sap_modem = sap_modem;

	g_at_chat_register(data->chat, "#RSEN:", telit_rsen_notify,
				FALSE, modem, NULL);

	g_at_chat_send(data->chat, "AT#NOPT=0", NULL, NULL, NULL, NULL);

	/* Set SAP functionality */
	g_at_chat_send(data->chat, "AT#RSEN=1,1,0,2,0", rsen_prefix,
				rsen_enable_cb, modem, NULL);

	return -EINPROGRESS;

error:
	shutdown(bt_fd, SHUT_RDWR);
	close(bt_fd);

	sap_close_io(modem);
	return -EINVAL;
}

static int telit_sap_disable(struct ofono_modem *modem)
{
	struct telit_data *data = ofono_modem_get_data(modem);

	DBG("%p", modem);

	g_at_chat_send(data->chat, "AT#RSEN=0", rsen_prefix,
				rsen_disable_cb, modem, NULL);

	return -EINPROGRESS;
}

static void telit_pre_sim(struct ofono_modem *modem)
{
	struct telit_data *data = ofono_modem_get_data(modem);

	if (data->sap_modem)
		modem = data->sap_modem;

	DBG("%p", modem);

	ofono_devinfo_create(modem, 0, "atmodem", data->chat);
	data->sim = ofono_sim_create(modem, OFONO_VENDOR_TELIT, "atmodem",
					data->chat);
	ofono_voicecall_create(modem, 0, "atmodem", data->chat);
}

static void telit_post_sim(struct ofono_modem *modem)
{
	struct telit_data *data = ofono_modem_get_data(modem);
	struct ofono_gprs *gprs;
	struct ofono_gprs_context *gc;

	if (data->sap_modem)
		modem = data->sap_modem;

	DBG("%p", modem);

	gprs = ofono_gprs_create(modem, OFONO_VENDOR_TELIT, "atmodem",
					data->chat);
	gc = ofono_gprs_context_create(modem, 0, "atmodem", data->modem);

	if (gprs && gc)
		ofono_gprs_add_context(gprs, gc);
}

static void set_online_cb(gboolean ok, GAtResult *result, gpointer user_data)
{
	struct cb_data *cbd = user_data;
	ofono_modem_online_cb_t cb = cbd->cb;
	struct ofono_error error;

	decode_at_error(&error, g_at_result_final_response(result));
	cb(&error, cbd->data);
}

static void telit_set_online(struct ofono_modem *modem, ofono_bool_t online,
				ofono_modem_online_cb_t cb, void *user_data)
{
	struct telit_data *data = ofono_modem_get_data(modem);
	struct cb_data *cbd = cb_data_new(cb, user_data);
	char const *command = online ? "AT+CFUN=1,0" : "AT+CFUN=4,0";

	DBG("modem %p %s", modem, online ? "online" : "offline");

	g_at_chat_send(data->chat, command, none_prefix, set_online_cb,
						cbd, g_free);
}

static void telit_post_online(struct ofono_modem *modem)
{
	struct telit_data *data = ofono_modem_get_data(modem);
	struct ofono_message_waiting *mw;

	if(data->sap_modem)
		modem = data->sap_modem;

	DBG("%p", modem);

	ofono_netreg_create(modem, OFONO_VENDOR_TELIT, "atmodem", data->chat);
	ofono_ussd_create(modem, 0, "atmodem", data->chat);
	ofono_call_forwarding_create(modem, 0, "atmodem", data->chat);
	ofono_call_settings_create(modem, 0, "atmodem", data->chat);
	ofono_call_meter_create(modem, 0, "atmodem", data->chat);
	ofono_call_barring_create(modem, 0, "atmodem", data->chat);

	mw = ofono_message_waiting_create(modem);
	if (mw)
		ofono_message_waiting_register(mw);
}

static struct bluetooth_sap_driver sap_driver = {
	.name = "telit",
	.enable = telit_sap_enable,
	.pre_sim = telit_pre_sim,
	.post_sim = telit_post_sim,
	.set_online = telit_set_online,
	.post_online = telit_post_online,
	.disable = telit_sap_disable,
};

static int telit_probe(struct ofono_modem *modem)
{
	struct telit_data *data;

	DBG("%p", modem);

	data = g_try_new0(struct telit_data, 1);
	if (data == NULL)
		return -ENOMEM;

	ofono_modem_set_data(modem, data);

	bluetooth_sap_client_register(&sap_driver, modem);

	return 0;
}

static void telit_remove(struct ofono_modem *modem)
{
	struct telit_data *data = ofono_modem_get_data(modem);

	DBG("%p", modem);

	bluetooth_sap_client_unregister(modem);

	ofono_modem_set_data(modem, NULL);

	/* Cleanup after hot-unplug */
	g_at_chat_unref(data->chat);
	g_at_chat_unref(data->modem);

	g_free(data);
}

static struct ofono_modem_driver telit_driver = {
	.name		= "telit",
	.probe		= telit_probe,
	.remove		= telit_remove,
	.enable		= telit_enable,
	.disable	= telit_disable,
	.set_online	= telit_set_online,
	.pre_sim	= telit_pre_sim,
	.post_sim	= telit_post_sim,
	.post_online	= telit_post_online,
};

static int telit_init(void)
{
	return ofono_modem_driver_register(&telit_driver);
}

static void telit_exit(void)
{
	ofono_modem_driver_unregister(&telit_driver);
}

OFONO_PLUGIN_DEFINE(telit, "telit driver", VERSION,
		OFONO_PLUGIN_PRIORITY_DEFAULT, telit_init, telit_exit)