/*
 * This file is part of oFono - Open Source Telephony
 *
 * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
 *
 * 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 <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>

#include <gisi/netlink.h>
#include <gisi/client.h>

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

#include "isimodem.h"
#include "isiutil.h"
#include "mtc.h"
#include "debug.h"

struct isi_data {
	struct ofono_modem *modem;
	char const *ifname;
	GIsiModem *idx;
	GIsiClient *client;
	GPhonetNetlink *link;
	GPhonetLinkState linkstate;
	unsigned interval;
	int reported;
	int mtc_state;
};

static void report_powered(struct isi_data *isi, ofono_bool_t powered)
{
	if (powered != isi->reported)
		ofono_modem_set_powered(isi->modem, isi->reported = powered);
}

static void set_power_by_mtc_state(struct isi_data *isi, int state)
{
	switch (isi->mtc_state = state) {
	case MTC_STATE_NONE:
	case MTC_POWER_OFF:
	case MTC_CHARGING:
	case MTC_SELFTEST_FAIL:
		report_powered(isi, 0);
		break;

	case MTC_RF_INACTIVE:
	case MTC_NORMAL:
		report_powered(isi, 1);
		break;

	default:
		report_powered(isi, 1);
	}
}

static void mtc_state_ind_cb(GIsiClient *client,
				const void *restrict data, size_t len,
				uint16_t object, void *opaque)
{
	const unsigned char *msg = data;
	struct isi_data *isi = opaque;

	if (!msg) {
		DBG("ISI client error: %d", g_isi_client_error(client));
		return;
	}

	if (len < 3 || msg[0] != MTC_STATE_INFO_IND)
		return;

	if (msg[2] == MTC_START) {
		DBG("target modem state: %s (0x%02X)",
			mtc_modem_state_name(msg[1]), msg[1]);
	} else if (msg[2] == MTC_READY) {
		DBG("current modem state: %s (0x%02X)",
			mtc_modem_state_name(msg[1]), msg[1]);
		set_power_by_mtc_state(isi, msg[1]);
	}
}

static gboolean mtc_poll_query_cb(GIsiClient *client,
					const void *restrict data, size_t len,
					uint16_t object, void *opaque)
{
	const unsigned char *msg = data;
	struct isi_data *isi = opaque;

	if (!msg) {
		const unsigned char req[] = {
			MTC_STATE_QUERY_REQ, 0x00, 0x00
		};

		if (isi->linkstate != PN_LINK_UP)
			return TRUE;

		isi->interval *= 2;
		if (isi->interval >= 20)
			isi->interval = 20;

		g_isi_request_make(client, req, sizeof(req),
					isi->interval,
					mtc_poll_query_cb, opaque);

		return TRUE;
	}

	if (len < 3 || msg[0] != MTC_STATE_QUERY_RESP)
		return FALSE;

	g_isi_subscribe(client, MTC_STATE_INFO_IND, mtc_state_ind_cb, opaque);

	DBG("current modem state: %s (0x%02X)",
		mtc_modem_state_name(msg[1]), msg[1]);
	DBG("target modem state: %s (0x%02X)",
		mtc_modem_state_name(msg[2]), msg[2]);

	set_power_by_mtc_state(isi, msg[1]);

	return TRUE;
}

static gboolean mtc_query_cb(GIsiClient *client,
				const void *restrict data, size_t len,
				uint16_t object, void *opaque)
{
	const unsigned char *msg = data;
	struct isi_data *isi = opaque;

	if (!msg) {
		DBG("ISI client error: %d", g_isi_client_error(client));
		return TRUE;
	}

	if (len < 3 || msg[0] != MTC_STATE_QUERY_RESP)
		return FALSE;

	DBG("current modem state: %s (0x%02X)",
		mtc_modem_state_name(msg[1]), msg[1]);
	DBG("target modem state: %s (0x%02X)",
		mtc_modem_state_name(msg[2]), msg[2]);

	set_power_by_mtc_state(isi, msg[1]);

	return TRUE;
}

static void reachable_cb(GIsiClient *client, gboolean alive, uint16_t object,
				void *opaque)
{
	struct isi_data *isi = opaque;

	const unsigned char msg[] = {
		MTC_STATE_QUERY_REQ,
		0x00, 0x00 /* Filler */
	};

	if (!alive) {
		DBG("MTC client: %s", strerror(-g_isi_client_error(client)));

		if (isi->linkstate == PN_LINK_UP)
			g_isi_request_make(client, msg, sizeof(msg),
						isi->interval = MTC_TIMEOUT,
						mtc_poll_query_cb, opaque);
		return;
	}

	DBG("%s (v.%03d.%03d) reachable",
		pn_resource_name(g_isi_client_resource(client)),
		g_isi_version_major(client),
		g_isi_version_minor(client));

	g_isi_subscribe(client, MTC_STATE_INFO_IND, mtc_state_ind_cb, opaque);
	g_isi_request_make(client, msg, sizeof(msg), MTC_TIMEOUT,
				mtc_query_cb, opaque);
}

static void phonet_status_cb(GIsiModem *idx,
				GPhonetLinkState st,
				char const *ifname,
				void *data)
{
	struct ofono_modem *modem = data;
	struct isi_data *isi = ofono_modem_get_data(modem);

	DBG("Link %s (%u) is %s",
		isi->ifname, g_isi_modem_index(isi->idx),
		st == PN_LINK_REMOVED ? "removed" :
		st == PN_LINK_DOWN ? "down" : "up");

	isi->linkstate = st;

	if (st == PN_LINK_UP)
		g_isi_verify(isi->client, reachable_cb, isi);
	else if (st == PN_LINK_DOWN)
		set_power_by_mtc_state(isi, MTC_STATE_NONE);
	else if (st == PN_LINK_REMOVED)
		ofono_modem_remove(modem);
}

static int isi_modem_probe(struct ofono_modem *modem)
{
	struct isi_data *isi;
	char const *ifname = ofono_modem_get_string(modem, "Interface");
	GIsiModem *idx;
	GPhonetNetlink *link;

	if (ifname == NULL)
		return -EINVAL;

	DBG("(%p) with %s", modem, ifname);

	idx = g_isi_modem_by_name(ifname);
	if (idx == NULL) {
		DBG("Interface=%s: %s", ifname, strerror(errno));
		return -errno;
	}

	if (g_pn_netlink_by_modem(idx)) {
		DBG("%s: %s", ifname, strerror(EBUSY));
		return -EBUSY;
	}

	link = g_pn_netlink_start(idx, phonet_status_cb, modem);
	if (!link) {
		DBG("%s: %s", ifname, strerror(errno));
		return -errno;
	}

	isi = g_new0(struct isi_data, 1);
	if (isi == NULL)
		return -ENOMEM;

	ofono_modem_set_data(isi->modem = modem, isi);

	isi->idx = idx;
	isi->ifname = ifname;
	isi->link = link;
	isi->client = g_isi_client_create(isi->idx, PN_MTC);

	return 0;
}

static void isi_modem_remove(struct ofono_modem *modem)
{
	struct isi_data *isi = ofono_modem_get_data(modem);

	if (!isi)
		return;

	ofono_modem_set_data(modem, NULL);
	g_isi_client_destroy(isi->client);
	g_pn_netlink_stop(isi->link);
	g_free(isi);
}

static void isi_modem_pre_sim(struct ofono_modem *modem)
{
	struct isi_data *isi = ofono_modem_get_data(modem);

	DBG("(%p) with %s", modem, isi->ifname);

	ofono_sim_create(isi->modem, 0, "isimodem", isi->idx);
	ofono_devinfo_create(isi->modem, 0, "isimodem", isi->idx);
	ofono_voicecall_create(isi->modem, 0, "isimodem", isi->idx);
}

static void isi_modem_post_sim(struct ofono_modem *modem)
{
	struct isi_data *isi = ofono_modem_get_data(modem);
	struct ofono_gprs *gprs;
	struct ofono_gprs_context *gc;

	DBG("(%p) with %s", modem, isi->ifname);

	ofono_phonebook_create(isi->modem, 0, "isimodem", isi->idx);
	ofono_netreg_create(isi->modem, 0, "isimodem", isi->idx);
	ofono_sms_create(isi->modem, 0, "isimodem", isi->idx);
	ofono_cbs_create(isi->modem, 0, "isimodem", isi->idx);
	ofono_ssn_create(isi->modem, 0, "isimodem", isi->idx);
	ofono_ussd_create(isi->modem, 0, "isimodem", isi->idx);
	ofono_call_forwarding_create(isi->modem, 0, "isimodem", isi->idx);
	ofono_call_settings_create(isi->modem, 0, "isimodem", isi->idx);
	ofono_call_barring_create(isi->modem, 0, "isimodem", isi->idx);
	ofono_call_meter_create(isi->modem, 0, "isimodem", isi->idx);
	ofono_radio_settings_create(isi->modem, 0, "isimodem", isi->idx);
	gprs = ofono_gprs_create(isi->modem, 0, "isimodem", isi->idx);
	gc = ofono_gprs_context_create(isi->modem, 0, "isimodem", isi->idx);

	if (gprs && gc)
		ofono_gprs_add_context(gprs, gc);
	else
		DBG("Failed to add context");
}

static struct ofono_modem_driver driver = {
	.name = "isimodem",
	.probe = isi_modem_probe,
	.remove = isi_modem_remove,
	.pre_sim = isi_modem_pre_sim,
	.post_sim = isi_modem_post_sim,
};

static int isimodem_init(void)
{
	isi_devinfo_init();
	isi_phonebook_init();
	isi_netreg_init();
	isi_voicecall_init();
	isi_sms_init();
	isi_cbs_init();
	isi_sim_init();
	isi_ssn_init();
	isi_ussd_init();
	isi_call_forwarding_init();
	isi_call_settings_init();
	isi_call_barring_init();
	isi_call_meter_init();
	isi_radio_settings_init();
	isi_gprs_init();
	isi_gprs_context_init();

	ofono_modem_driver_register(&driver);

	return 0;
}

static void isimodem_exit(void)
{
	ofono_modem_driver_unregister(&driver);

	isi_devinfo_exit();
	isi_phonebook_exit();
	isi_netreg_exit();
	isi_voicecall_exit();
	isi_sms_exit();
	isi_cbs_exit();
	isi_sim_exit();
	isi_ssn_exit();
	isi_ussd_exit();
	isi_call_forwarding_exit();
	isi_call_settings_exit();
	isi_call_barring_exit();
	isi_call_meter_exit();
	isi_radio_settings_exit();
	isi_gprs_exit();
	isi_gprs_context_exit();
}

OFONO_PLUGIN_DEFINE(isimodem, "PhoNet / ISI modem driver", VERSION,
		OFONO_PLUGIN_PRIORITY_DEFAULT, isimodem_init, isimodem_exit)