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/*
 *  oFono - Open Source Telephony
 *
 *  Copyright (C) 2008-2009  Intel Corporation. All rights reserved.
 *  Copyright (C) 2009  Collabora Ltd. 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 <stdlib.h>
#include <errno.h>

#include <glib.h>
#include <gatchat.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/sms.h>
#include <ofono/ssn.h>
#include <ofono/ussd.h>
#include <ofono/voicecall.h>

#include <drivers/atmodem/vendor.h>

/* Supply our own syntax parser */

enum G1_STATE_ {
	G1_STATE_IDLE = 0,
	G1_STATE_RESPONSE,
	G1_STATE_GUESS_PDU,
	G1_STATE_PDU,
	G1_STATE_PROMPT,
};

static void g1_hint(GAtSyntax *syntax, GAtSyntaxExpectHint hint)
{
	if (hint == G_AT_SYNTAX_EXPECT_PDU)
		syntax->state = G1_STATE_GUESS_PDU;
}

static GAtSyntaxResult g1_feed(GAtSyntax *syntax,
		const char *bytes, gsize *len)
{
	gsize i = 0;
	GAtSyntaxResult res = G_AT_SYNTAX_RESULT_UNSURE;

	while (i < *len) {
		char byte = bytes[i];

		switch (syntax->state) {
		case G1_STATE_IDLE:
			if (byte == '\r' || byte == '\n')
				/* ignore */;
			else if (byte == '>')
				syntax->state = G1_STATE_PROMPT;
			else
				syntax->state = G1_STATE_RESPONSE;
			break;

		case G1_STATE_RESPONSE:
			if (byte == '\r') {
				syntax->state = G1_STATE_IDLE;

				i += 1;
				res = G_AT_SYNTAX_RESULT_LINE;
				goto out;
			}
			break;

		case G1_STATE_GUESS_PDU:
			/* keep going until we find a LF that leads the PDU */
			if (byte == '\n')
				syntax->state = G1_STATE_PDU;
			break;

		case G1_STATE_PDU:
			if (byte == '\r') {
				syntax->state = G1_STATE_IDLE;

				i += 1;
				res = G_AT_SYNTAX_RESULT_PDU;
				goto out;
			}
			break;

		case G1_STATE_PROMPT:
			if (byte == ' ') {
				syntax->state = G1_STATE_IDLE;
				i += 1;
				res = G_AT_SYNTAX_RESULT_PROMPT;
				goto out;
			}

			syntax->state = G1_STATE_RESPONSE;
			return G_AT_SYNTAX_RESULT_UNSURE;

		default:
			break;
		};

		i += 1;
	}

out:
	*len = i;
	return res;
}

static void g1_debug(const char *str, void *data)
{
	DBG("%s", str);
}

/* Detect hardware, and initialize if found */
static int g1_probe(struct ofono_modem *modem)
{
	GAtSyntax *syntax;
	GAtChat *chat;
	const char *device;

	DBG("");

	device = ofono_modem_get_string(modem, "Device");
	if (device == NULL)
		return -EINVAL;

	syntax = g_at_syntax_new_full(g1_feed, g1_hint, G1_STATE_IDLE);
	chat = g_at_chat_new_from_tty(device, syntax);
	g_at_syntax_unref(syntax);

	if (chat == NULL)
		return -EIO;

	if (getenv("OFONO_AT_DEBUG") != NULL)
		g_at_chat_set_debug(chat, g1_debug, NULL);

	ofono_modem_set_data(modem, chat);

	return 0;
}

static void g1_remove(struct ofono_modem *modem)
{
	GAtChat *chat = ofono_modem_get_data(modem);

	DBG("");

	ofono_modem_set_data(modem, NULL);
	g_at_chat_unref(chat);
}

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

	if (ok)
		ofono_modem_set_powered(modem, TRUE);
}

/* power up hardware */
static int g1_enable(struct ofono_modem *modem)
{
	GAtChat *chat = ofono_modem_get_data(modem);

	DBG("");

	/* ensure modem is in a known state; verbose on, echo/quiet off */
	g_at_chat_send(chat, "ATE0Q0V1", NULL, NULL, NULL, NULL);

	/* power up modem */
	g_at_chat_send(chat, "AT+CFUN=1", NULL, cfun_set_on_cb, modem, NULL);

	return 0;
}

static void cfun_set_off_cb(gboolean ok, GAtResult *result, gpointer user_data)
{
	struct ofono_modem *modem = user_data;
 
	DBG("");
 
	if (ok)
		ofono_modem_set_powered(modem, FALSE);
}

static int g1_disable(struct ofono_modem *modem)
{
	GAtChat *chat = ofono_modem_get_data(modem);

	DBG("");

	/* power down modem */
	g_at_chat_send(chat, "AT+CFUN=0", NULL, cfun_set_off_cb, modem, NULL);

	return 0;
}

static void g1_populate(struct ofono_modem *modem)
{
	GAtChat *chat = ofono_modem_get_data(modem);
	struct ofono_message_waiting *mw;

	DBG("");

	ofono_devinfo_create(modem, 0, "atmodem", chat);
	ofono_ussd_create(modem, 0, "atmodem", chat);
	ofono_sim_create(modem, 0, "atmodem", chat);
	ofono_call_forwarding_create(modem, 0, "atmodem", chat);
	ofono_call_settings_create(modem, 0, "atmodem", chat);
	ofono_netreg_create(modem, 0, "atmodem", chat);
	ofono_voicecall_create(modem, 0, "atmodem", chat);
	ofono_call_meter_create(modem, 0, "atmodem", chat);
	ofono_call_barring_create(modem, 0, "atmodem", chat);
	ofono_ssn_create(modem, 0, "atmodem", chat);
	ofono_sms_create(modem, OFONO_VENDOR_HTC_G1, "atmodem", chat);
	ofono_phonebook_create(modem, 0, "atmodem", chat);

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

static struct ofono_modem_driver g1_driver = {
	.name		= "g1",
	.probe		= g1_probe,
	.remove		= g1_remove,
	.enable		= g1_enable,
	.disable	= g1_disable,
	.populate	= g1_populate,
};

static int g1_init(void)
{
	return ofono_modem_driver_register(&g1_driver);
}

static void g1_exit(void)
{
	ofono_modem_driver_unregister(&g1_driver);
}

OFONO_PLUGIN_DEFINE(g1, "HTC G1 modem driver", VERSION,
			OFONO_PLUGIN_PRIORITY_DEFAULT, g1_init, g1_exit)