/* main.c - Application main entry point */

/*
 * Copyright (c) 2015 Intel Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <errno.h>
#include <misc/printk.h>
#include <misc/byteorder.h>
#include <zephyr.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/conn.h>
#include <bluetooth/uuid.h>
#include <bluetooth/gatt.h>

#define DEVICE_NAME	"DIS peripheral"
#define DEVICE_NAME_LEN	(sizeof(DEVICE_NAME) - 1)
#define APPEARANCE	0x0000

static int read_appearance(struct bt_conn *conn,
			   const struct bt_gatt_attr *attr, void *buf,
			   uint16_t len, uint16_t offset)
{
	uint16_t appearance = sys_cpu_to_le16(APPEARANCE);

	return bt_gatt_attr_read(conn, attr, buf, len, offset, &appearance,
				 sizeof(appearance));
}

static int read_string(struct bt_conn *conn, const struct bt_gatt_attr *attr,
		       void *buf, uint16_t len, uint16_t offset)
{
	const char *value = attr->user_data;

	return bt_gatt_attr_read(conn, attr, buf, len, offset, value,
				 strlen(value));
}

static struct bt_gatt_attr attrs[] = {
	BT_GATT_PRIMARY_SERVICE(BT_UUID_GAP),
	BT_GATT_CHARACTERISTIC(BT_UUID_GAP_DEVICE_NAME, BT_GATT_CHRC_READ),
	BT_GATT_DESCRIPTOR(BT_UUID_GAP_DEVICE_NAME, BT_GATT_PERM_READ,
			   read_string, NULL, DEVICE_NAME),
	BT_GATT_CHARACTERISTIC(BT_UUID_GAP_APPEARANCE, BT_GATT_CHRC_READ),
	BT_GATT_DESCRIPTOR(BT_UUID_GAP_APPEARANCE, BT_GATT_PERM_READ,
			   read_appearance, NULL, NULL),
	/* Device Information Service Declaration */
	BT_GATT_PRIMARY_SERVICE(BT_UUID_DIS),
	BT_GATT_CHARACTERISTIC(BT_UUID_DIS_MODEL_NUMBER, BT_GATT_CHRC_READ),
	BT_GATT_DESCRIPTOR(BT_UUID_DIS_MODEL_NUMBER, BT_GATT_PERM_READ,
			   read_string, NULL, CONFIG_SOC),
	BT_GATT_CHARACTERISTIC(BT_UUID_DIS_MANUFACTURER_NAME,
			       BT_GATT_CHRC_READ),
	BT_GATT_DESCRIPTOR(BT_UUID_DIS_MANUFACTURER_NAME, BT_GATT_PERM_READ,
			   read_string, NULL, "Manufacturer"),
};

static const struct bt_data ad[] = {
	BT_DATA_BYTES(BT_DATA_FLAGS, (BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR)),
	BT_DATA_BYTES(BT_DATA_UUID16_ALL, 0x0a, 0x18),
};

static const struct bt_data sd[] = {
	BT_DATA(BT_DATA_NAME_COMPLETE, DEVICE_NAME, DEVICE_NAME_LEN),
};

static void connected(struct bt_conn *conn, uint8_t err)
{
	if (err) {
		printk("Connection failed (err %u)\n", err);
	} else {
		printk("Connected\n");
	}
}

static void disconnected(struct bt_conn *conn, uint8_t reason)
{
	printk("Disconnected (reason %u)\n", reason);
}

static struct bt_conn_cb conn_callbacks = {
	.connected = connected,
	.disconnected = disconnected,
};

#ifdef CONFIG_MICROKERNEL
void mainloop(void)
#else
void main(void)
#endif
{
	int err;

	err = bt_enable(NULL);
	if (err) {
		printk("Bluetooth init failed (err %d)\n", err);
		return;
	}

	printk("Bluetooth initialized\n");

	bt_gatt_register(attrs, ARRAY_SIZE(attrs));

	bt_conn_cb_register(&conn_callbacks);

	err = bt_le_adv_start(BT_LE_ADV(BT_LE_ADV_IND), ad, ARRAY_SIZE(ad),
			      sd, ARRAY_SIZE(sd));
	if (err) {
		printk("Advertising failed to start (err %d)\n", err);
		return;
	}

	printk("Advertising successfully started\n");
}