/** @file
 *  @brief GATT Battery Service
 */

/*
 * Copyright (c) 2018 Nordic Semiconductor ASA
 * Copyright (c) 2016 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <errno.h>
#include <stdbool.h>
#include <zephyr/types.h>

#include "bluetooth.h"
#include "conn.h"
#include "gatt.h"
#include "uuid.h"
#include "bas.h"

#if !defined(BFLB_BLE)
#define LOG_LEVEL CONFIG_BT_GATT_BAS_LOG_LEVEL
#include <logging/log.h>
LOG_MODULE_REGISTER(bas);
#endif

static u8_t battery_level = 100U;

static void blvl_ccc_cfg_changed(const struct bt_gatt_attr *attr,
                                 u16_t value)
{
    ARG_UNUSED(attr);

    bool notif_enabled = (value == BT_GATT_CCC_NOTIFY);

#if !defined(BFLB_BLE)
    LOG_INF("BAS Notifications %s", notif_enabled ? "enabled" : "disabled");
#endif
}

static ssize_t read_blvl(struct bt_conn *conn,
                         const struct bt_gatt_attr *attr, void *buf,
                         u16_t len, u16_t offset)
{
    u8_t lvl8 = battery_level;

    return bt_gatt_attr_read(conn, attr, buf, len, offset, &lvl8,
                             sizeof(lvl8));
}

static struct bt_gatt_attr attrs[] = {
    BT_GATT_PRIMARY_SERVICE(BT_UUID_BAS),
    BT_GATT_CHARACTERISTIC(BT_UUID_BAS_BATTERY_LEVEL,
                           BT_GATT_CHRC_READ | BT_GATT_CHRC_NOTIFY,
                           BT_GATT_PERM_READ, read_blvl, NULL,
                           &battery_level),
    BT_GATT_CCC(blvl_ccc_cfg_changed, BT_GATT_PERM_READ | BT_GATT_PERM_WRITE),
    BT_GATT_DESCRIPTOR(BT_UUID_HIDS_REPORT_REF, BT_GATT_PERM_READ,
                       NULL, NULL, NULL),
};

struct bt_gatt_service bas = BT_GATT_SERVICE(attrs);

void bas_init(void)
{
    bt_gatt_service_register(&bas);
}

u8_t bt_gatt_bas_get_battery_level(void)
{
    return battery_level;
}

int bt_gatt_bas_set_battery_level(u8_t level)
{
    int rc;

    if (level > 100U) {
        return -EINVAL;
    }

    battery_level = level;

    rc = bt_gatt_notify(NULL, &bas.attrs[1], &level, sizeof(level));

    return rc == -ENOTCONN ? 0 : rc;
}

#if !defined(BFLB_BLE)
SYS_INIT(bas_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
#endif