/*
 * oFono - Open Source Telephony
 * Copyright (C) 2017  Intel Corporation
 * Copyright (C) 2018  Gemalto M2M
 *
 * SPDX-License-Identifier: GPL-2.0-only
 */

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

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>

#include <glib.h>

#include <ofono/modem.h>
#include <ofono/gprs-context.h>
#include <ofono/log.h>
#include <ofono/lte.h>

#include <drivers/atmodem/atutil.h>

#include "gatchat.h"
#include "gatresult.h"

static const char *none_prefix[] = { NULL };

struct lte_driver_data {
	GAtChat *chat;
	struct ofono_lte_default_attach_info pending_info;
};

static void at_lte_set_auth_cb(gboolean ok, GAtResult *result,
							gpointer user_data)
{
	struct cb_data *cbd = user_data;
	ofono_lte_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 at_lte_set_default_attach_info_cb(gboolean ok, GAtResult *result,
							gpointer user_data)
{
	struct cb_data *cbd = user_data;
	ofono_lte_cb_t cb = cbd->cb;
	void *data = cbd->data;
	struct lte_driver_data *ldd = cbd->user;
	struct ofono_error error;
	char buf[32 + OFONO_GPRS_MAX_USERNAME_LENGTH +
					OFONO_GPRS_MAX_PASSWORD_LENGTH  + 1];
	size_t buflen = sizeof(buf);
	size_t len;
	enum ofono_gprs_auth_method auth_method;

	if (!ok) {
		decode_at_error(&error, g_at_result_final_response(result));
		cb(&error, data);
		return;
	}

	auth_method = ldd->pending_info.auth_method;

	/* change the authentication method if the  parameters are invalid */
	if (!*ldd->pending_info.username ||
		(!*ldd->pending_info.username && !*ldd->pending_info.password))
		auth_method = OFONO_GPRS_AUTH_METHOD_NONE;

	len = snprintf(buf, buflen, "AT+CGAUTH=0,%d",
			at_util_gprs_auth_method_to_auth_prot(auth_method));
	buflen -= len;

	if (auth_method != OFONO_GPRS_AUTH_METHOD_NONE)
		snprintf(buf + len, buflen, ",\"%s\",\"%s\"",
				ldd->pending_info.username,
				ldd->pending_info.password);

	cbd = cb_data_ref(cbd);
	if (g_at_chat_send(ldd->chat, buf, none_prefix,
			at_lte_set_auth_cb, cbd, cb_data_unref) > 0)
		return;

	cb_data_unref(cbd);
	CALLBACK_WITH_FAILURE(cb, data);
}

static void at_lte_set_default_attach_info(const struct ofono_lte *lte,
			const struct ofono_lte_default_attach_info *info,
			ofono_lte_cb_t cb, void *data)
{
	struct lte_driver_data *ldd = ofono_lte_get_data(lte);
	struct cb_data *cbd = cb_data_new(cb, data);
	char *buf = at_util_get_cgdcont_command(0, info->proto, info->apn);

	cbd->user = ldd;
	memcpy(&ldd->pending_info, info, sizeof(ldd->pending_info));

	if (g_at_chat_send(ldd->chat, buf, none_prefix,
					at_lte_set_default_attach_info_cb,
					cbd, cb_data_unref) > 0)
		goto end;

	cb_data_unref(cbd);
	CALLBACK_WITH_FAILURE(cb, data);
end:
	g_free(buf);
}

static gboolean lte_delayed_register(gpointer user_data)
{
	struct ofono_lte *lte = user_data;

	ofono_lte_register(lte);

	return FALSE;
}

static int at_lte_probe(struct ofono_lte *lte, unsigned int vendor, void *data)
{
	GAtChat *chat = data;
	struct lte_driver_data *ldd;

	DBG("at lte probe");

	ldd = g_try_new0(struct lte_driver_data, 1);
	if (!ldd)
		return -ENOMEM;

	ldd->chat = g_at_chat_clone(chat);

	ofono_lte_set_data(lte, ldd);

	g_idle_add(lte_delayed_register, lte);

	return 0;
}

static void at_lte_remove(struct ofono_lte *lte)
{
	struct lte_driver_data *ldd = ofono_lte_get_data(lte);

	DBG("at lte remove");

	g_at_chat_unref(ldd->chat);

	ofono_lte_set_data(lte, NULL);

	g_free(ldd);
}

static const struct ofono_lte_driver driver = {
	.probe				= at_lte_probe,
	.remove				= at_lte_remove,
	.set_default_attach_info	= at_lte_set_default_attach_info,
};

OFONO_ATOM_DRIVER_BUILTIN(lte, atmodem, &driver)
