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/*
 * This file is part of oFono - Open Source Telephony
 *
 * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
 *
 * Contact: Aki Niemi <aki.niemi@nokia.com>
 *
 * 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

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/uio.h>
#include <errno.h>

#include <glib.h>

#include <gisi/client.h>

#include <ofono/log.h>
#include <ofono/modem.h>
#include <ofono/ussd.h>

#include "smsutil.h"
#include "util.h"

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

struct ussd_data {
	GIsiClient *client;
};

static inline int isi_type_to_status(uint8_t type)
{
	switch (type) {
	case SS_GSM_USSD_MT_REPLY:
		return OFONO_USSD_STATUS_LOCAL_CLIENT_RESPONDED;
	case SS_GSM_USSD_COMMAND:
		return OFONO_USSD_STATUS_ACTION_REQUIRED;
	case SS_GSM_USSD_NOTIFY:
		return OFONO_USSD_STATUS_NOTIFY;
	case SS_GSM_USSD_END:
		return OFONO_USSD_STATUS_TERMINATED;
	case SS_GSM_USSD_REQUEST:
	default:
		return OFONO_USSD_STATUS_NOT_SUPPORTED;
	}
}

static void ussd_parse(struct ofono_ussd *ussd, const void *restrict data,
			size_t len)
{
	const unsigned char *msg = data;
	unsigned char buf[256];
	unsigned char *unpacked;
	long written;
	int status;
	char *converted = NULL;
	gboolean udhi;
	enum sms_charset charset;
	gboolean compressed;
	gboolean iso639;

	if (!msg || len < 4)
		goto error;

	status = isi_type_to_status(msg[2]);

	if (msg[3] == 0 || (size_t)(msg[3] + 4) > len)
		goto error;

	if (!cbs_dcs_decode(msg[1], &udhi, NULL, &charset,
				&compressed, NULL, &iso639))
		goto error;

	if (udhi || compressed || iso639)
		goto error;

	if (charset != SMS_CHARSET_7BIT)
		goto error;

	unpacked = unpack_7bit_own_buf(msg + 4, msg[3], 0, TRUE,
					SS_MAX_USSD_LENGTH, &written, 0, buf);

	converted = convert_gsm_to_utf8((const guint8 *)unpacked, written,
					NULL, NULL, 0);

	goto out;

error:
	status = OFONO_USSD_STATUS_NOT_SUPPORTED;

out:
	ofono_ussd_notify(ussd, status, converted);
	g_free(converted);
}


static bool ussd_send_resp_cb(GIsiClient *client, const void *restrict data,
				size_t len, uint16_t object, void *opaque)
{
	const unsigned char *msg = data;
	struct isi_cb_data *cbd = opaque;
	ofono_ussd_cb_t cb = cbd->cb;

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

	if (len < 3)
		return false;

	if (msg[0] == SS_SERVICE_FAILED_RESP)
		goto error;

	if (len < 4 || msg[0] != SS_GSM_USSD_SEND_RESP)
		return false;

	CALLBACK_WITH_SUCCESS(cb, cbd->data);

	ussd_parse(cbd->user, data, len);
	goto out;

error:
	CALLBACK_WITH_FAILURE(cb, cbd->data);

out:
	g_free(cbd);
	return true;
}

static GIsiRequest *ussd_send_make(GIsiClient *client, uint8_t *str,
					size_t len, void *data)
{
	const uint8_t msg[] = {
		SS_GSM_USSD_SEND_REQ,
		SS_GSM_USSD_COMMAND,
		0x01, /* subblock count */
		SS_GSM_USSD_STRING,
		(4 + len + 3) & ~3, /* subblock length */
		0x0f, /* DCS */
		len, /* string length */
		/* USSD string goes here */
	};

	const struct iovec iov[2] = {
		{ (uint8_t *)msg, sizeof(msg) },
		{ str, len }
	};

	return g_isi_request_vmake(client, iov, 2, SS_TIMEOUT,
					ussd_send_resp_cb, data);
}

static void isi_request(struct ofono_ussd *ussd, const char *str,
				ofono_ussd_cb_t cb, void *data)
{
	struct ussd_data *ud = ofono_ussd_get_data(ussd);
	struct isi_cb_data *cbd = isi_cb_data_new(ussd, cb, data);
	unsigned char buf[256];
	unsigned char *packed = NULL;
	unsigned char *converted = NULL;
	long num_packed;
	long written;

	if (!cbd)
		goto error;

	converted = convert_utf8_to_gsm(str, strlen(str), NULL, &written, 0);
	if (!converted)
		goto error;

	packed = pack_7bit_own_buf(converted, written, 0, TRUE,
					&num_packed, 0, buf);

	g_free(converted);

	if (written > SS_MAX_USSD_LENGTH)
		goto error;

	if (ussd_send_make(ud->client, packed, num_packed, cbd))
		return;

error:
	CALLBACK_WITH_FAILURE(cb, data);
	g_free(cbd);
}

static void isi_cancel(struct ofono_ussd *ussd,
				ofono_ussd_cb_t cb, void *data)
{
	struct ussd_data *ud = ofono_ussd_get_data(ussd);
	struct isi_cb_data *cbd = isi_cb_data_new(ussd, cb, data);

	const unsigned char msg[] = {
		SS_GSM_USSD_SEND_REQ,
		SS_GSM_USSD_END,
		0x00 /* subblock count */
	};

	if (!cbd)
		goto error;

	if (g_isi_request_make(ud->client, msg, sizeof(msg), SS_TIMEOUT,
				ussd_send_resp_cb, cbd))
		return;

error:
	CALLBACK_WITH_FAILURE(cb, data);
	g_free(cbd);
}

static void ussd_ind_cb(GIsiClient *client, const void *restrict data,
			size_t len, uint16_t object, void *opaque)
{
	const unsigned char *msg = data;
	struct ofono_ussd *ussd = opaque;

	if (!msg || len < 4 || msg[0] != SS_GSM_USSD_RECEIVE_IND)
		return;

	ussd_parse(ussd, data, len);
}

static gboolean isi_ussd_register(gpointer user)
{
	struct ofono_ussd *ussd = user;
	struct ussd_data *ud = ofono_ussd_get_data(ussd);

	const char *debug = getenv("OFONO_ISI_DEBUG");

	if (debug && (strcmp(debug, "all") == 0 || strcmp(debug, "ussd") == 0))
		g_isi_client_set_debug(ud->client, ss_debug, NULL);

	g_isi_subscribe(ud->client, SS_GSM_USSD_RECEIVE_IND, ussd_ind_cb, ussd);
	ofono_ussd_register(ussd);

	return FALSE;
}

static void ussd_reachable_cb(GIsiClient *client, bool alive, uint16_t object,
				void *opaque)
{
	struct ofono_ussd *ussd = opaque;

	if (!alive) {
		DBG("Unable to bootstrap ussd driver");
		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_idle_add(isi_ussd_register, ussd);
}

static int isi_ussd_probe(struct ofono_ussd *ussd, unsigned int vendor,
				void *user)
{
	GIsiModem *idx = user;
	struct ussd_data *ud = g_try_new0(struct ussd_data, 1);

	if (!ud)
		return -ENOMEM;

	ud->client = g_isi_client_create(idx, PN_SS);
	if (!ud->client)
		return -ENOMEM;

	ofono_ussd_set_data(ussd, ud);
	g_isi_verify(ud->client, ussd_reachable_cb, ussd);

	return 0;
}

static void isi_ussd_remove(struct ofono_ussd *ussd)
{
	struct ussd_data *data = ofono_ussd_get_data(ussd);

	if (!data)
		return;

	ofono_ussd_set_data(ussd, NULL);
	g_isi_client_destroy(data->client);
	g_free(data);
}

static struct ofono_ussd_driver driver = {
	.name			= "isimodem",
	.probe			= isi_ussd_probe,
	.remove			= isi_ussd_remove,
	.request		= isi_request,
	.cancel			= isi_cancel
};

void isi_ussd_init()
{
	ofono_ussd_driver_register(&driver);
}

void isi_ussd_exit()
{
	ofono_ussd_driver_unregister(&driver);
}