/*
 *
 *  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

#define _GNU_SOURCE
#include <string.h>
#include <stdio.h>

#include <glib.h>

#include <ofono/modem.h>
#include <ofono/sim-auth.h>

#include "gatchat.h"
#include "gatresult.h"
#include "simutil.h"
#include "vendor.h"
#include "util.h"

#include "atmodem.h"

struct sim_auth_data {
	GAtChat *chat;
	unsigned int vendor;
};

static const char *cuad_prefix[] = { "+CUAD:", NULL };
static const char *ccho_prefix[] = { "+CCHO:", NULL };
static const char *cgla_prefix[] = { "+CGLA:", NULL };

static void at_discover_apps_cb(gboolean ok, GAtResult *result,
				gpointer user_data)
{
	struct cb_data *cbd = user_data;
	GAtResultIter iter;
	ofono_sim_list_apps_cb_t cb = cbd->cb;
	struct ofono_error error;
	const unsigned char *dataobj;
	gint linelen;
	unsigned char *buffer;
	int len;

	decode_at_error(&error, g_at_result_final_response(result));

	if (!ok) {
		cb(&error, NULL, 0, cbd->data);
		return;
	}

	g_at_result_iter_init(&iter, result);

	len = 0;
	while (g_at_result_iter_next(&iter, "+CUAD:")) {
		if (!g_at_result_iter_next_hexstring(&iter, NULL, &linelen))
			goto error;

		len += linelen;
	}

	g_at_result_iter_init(&iter, result);

	buffer = g_malloc(len);
	len = 0;

	while (g_at_result_iter_next(&iter, "+CUAD:")) {
		g_at_result_iter_next_hexstring(&iter, &dataobj, &linelen);
		memcpy(buffer + len, dataobj, linelen);
		len += linelen;
	}

	cb(&error, buffer, len, cbd->data);

	g_free(buffer);
	return;

error:
	CALLBACK_WITH_FAILURE(cb, NULL, 0, cbd->data);
}

static void at_discover_apps(struct ofono_sim_auth *sa,
				ofono_sim_list_apps_cb_t cb,
				void *data)
{
	struct sim_auth_data *sad = ofono_sim_auth_get_data(sa);
	struct cb_data *cbd = cb_data_new(cb, data);

	if (g_at_chat_send(sad->chat, "AT+CUAD", cuad_prefix,
					at_discover_apps_cb, cbd, g_free) > 0)
		return;

	g_free(cbd);

	CALLBACK_WITH_FAILURE(cb, NULL, 0, data);
}

static void at_open_channel_cb(gboolean ok, GAtResult *result,
		gpointer user_data)
{
	struct cb_data *cbd = user_data;
	GAtResultIter iter;
	ofono_sim_open_channel_cb_t cb = cbd->cb;
	struct ofono_error error;
	int session_id = -1;

	decode_at_error(&error, g_at_result_final_response(result));

	if (!ok)
		goto error;

	g_at_result_iter_init(&iter, result);

	if (!g_at_result_iter_next(&iter, "+CCHO:"))
		goto error;

	if (!g_at_result_iter_next_number(&iter, &session_id))
		goto error;

	cb(&error, session_id, cbd->data);

	return;

error:
	cb(&error, -1, cbd->data);
}

static void at_open_channel(struct ofono_sim_auth *sa, const uint8_t *aid,
		ofono_sim_open_channel_cb_t cb, void *data)
{
	struct sim_auth_data *sad = ofono_sim_auth_get_data(sa);
	struct cb_data *cbd = cb_data_new(cb, data);
	char cmd[43];
	int ret = 0;

	strcpy(cmd, "AT+CCHO=\"");
	ret += 9;

	encode_hex_own_buf(aid, 16, 0, cmd + ret);
	ret += 32;

	strcpy(cmd + ret, "\"");

	if (g_at_chat_send(sad->chat, cmd, ccho_prefix, at_open_channel_cb,
			cbd, g_free) > 0)
		return;

	g_free(cbd);

	CALLBACK_WITH_FAILURE(cb, -1, data);
}

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

	decode_at_error(&error, g_at_result_final_response(result));

	if (cb)
		cb(&error, cbd->data);
}

static void at_close_channel(struct ofono_sim_auth *sa, int session_id,
		ofono_sim_close_channel_cb_t cb, void *data)
{
	struct sim_auth_data *sad = ofono_sim_auth_get_data(sa);
	struct cb_data *cbd = cb_data_new(cb, data);
	char cmd[15];

	sprintf(cmd, "AT+CCHC=%d", session_id);

	g_at_chat_send(sad->chat, cmd, NULL, at_close_channel_cb, cbd, g_free);
}

static void logical_access_cb(gboolean ok, GAtResult *result,
		gpointer user_data)
{
	struct cb_data *cbd = user_data;
	ofono_logical_access_cb_t cb = cbd->cb;
	struct ofono_error error;
	const char *str_data;
	uint8_t *raw;
	gint len = 0;
	GAtResultIter iter;

	decode_at_error(&error, g_at_result_final_response(result));

	if (!ok)
		goto error;

	g_at_result_iter_init(&iter, result);

	if (!g_at_result_iter_next(&iter, "+CGLA:"))
		goto error;

	if (!g_at_result_iter_next_number(&iter, &len))
		goto error;

	if (!g_at_result_iter_next_string(&iter, &str_data))
		goto error;

	raw = alloca(len / 2);

	decode_hex_own_buf(str_data, len, NULL, 0, raw);

	cb(&error, raw, len / 2, cbd->data);

	return;

error:
	cb(&error, NULL, 0, cbd->data);
}

static void at_logical_access(struct ofono_sim_auth *sa, int session_id,
		const uint8_t *pdu, uint16_t len, ofono_logical_access_cb_t cb,
		void *data)

{
	struct sim_auth_data *sad = ofono_sim_auth_get_data(sa);
	struct cb_data *cbd = cb_data_new(cb, data);
	int ret = 0;
	char cmd[(len * 2) + 19];

	ret = sprintf(cmd, "AT+CGLA=%d,%d,\"", session_id, len * 2);

	encode_hex_own_buf(pdu, len, 0, cmd + ret);
	ret += len * 2;

	strcpy(cmd + ret, "\"");

	if (g_at_chat_send(sad->chat, cmd, cgla_prefix, logical_access_cb,
			cbd, g_free) > 0)
		return;

	g_free(cbd);

	CALLBACK_WITH_FAILURE(cb, NULL, 0, data);
}

static gboolean at_sim_auth_register(gpointer user)
{
	struct ofono_sim_auth *sa = user;

	ofono_sim_auth_register(sa);

	return FALSE;
}

static int at_sim_auth_probe(struct ofono_sim_auth *sa, unsigned int vendor,
				void *data)
{
	GAtChat *chat = data;
	struct sim_auth_data *sad;

	sad = g_new0(struct sim_auth_data, 1);
	sad->chat = g_at_chat_clone(chat);
	sad->vendor = vendor;

	ofono_sim_auth_set_data(sa, sad);
	g_idle_add(at_sim_auth_register, sa);

	return 0;
}

static void at_sim_auth_remove(struct ofono_sim_auth *sa)
{
	struct sim_auth_data *sad = ofono_sim_auth_get_data(sa);

	g_idle_remove_by_data(sa);
	ofono_sim_auth_set_data(sa, NULL);

	g_at_chat_unref(sad->chat);
	g_free(sad);
}

static struct ofono_sim_auth_driver driver = {
	.name		= "atmodem",
	.probe		= at_sim_auth_probe,
	.remove		= at_sim_auth_remove,
	.list_apps	= at_discover_apps,
	.open_channel	= at_open_channel,
	.close_channel	= at_close_channel,
	.logical_access = at_logical_access
};

void at_sim_auth_init(void)
{
	ofono_sim_auth_driver_register(&driver);
}

void at_sim_auth_exit(void)
{
	ofono_sim_auth_driver_unregister(&driver);
}