// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
//
// 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.



/****************************************************************************
*
* This file is for iBeacon APIs. It supports both iBeacon encode and decode. 
*
* iBeacon is a trademark of Apple Inc. Before building devices which use iBeacon technology,
* visit https://developer.apple.com/ibeacon/ to obtain a license.
*
****************************************************************************/

#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#include <stdio.h>

#include "esp_gap_ble_api.h"
#include "esp_ibeacon_api.h"


const uint8_t uuid_zeros[ESP_UUID_LEN_128] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

/* For iBeacon packet format, please refer to Apple "Proximity Beacon Specification" doc */
/* Constant part of iBeacon data */
esp_ble_ibeacon_head_t ibeacon_common_head = {
    .flags = {0x02, 0x01, 0x06},
    .length = 0x1A,
    .type = 0xFF,
    .company_id = 0x004C,
    .beacon_type = 0x1502
};

/* Vendor part of iBeacon data*/
esp_ble_ibeacon_vendor_t vendor_config = {
    .proximity_uuid = ESP_UUID,
    .major = ENDIAN_CHANGE_U16(ESP_MAJOR), //Major=ESP_MAJOR
    .minor = ENDIAN_CHANGE_U16(ESP_MINOR), //Minor=ESP_MINOR
    .measured_power = 0xC5
};

BOOLEAN esp_ble_is_ibeacon_packet (uint8_t *adv_data, uint8_t adv_data_len){
    BOOLEAN result = FALSE;

    if ((adv_data != NULL) && (adv_data_len == 0x1E)){
        if (!memcmp(adv_data, (uint8_t*)&ibeacon_common_head, sizeof(ibeacon_common_head))){
            result = TRUE;
        }
    }

    return result;
}

esp_err_t esp_ble_config_ibeacon_data (esp_ble_ibeacon_vendor_t *vendor_config, esp_ble_ibeacon_t *ibeacon_adv_data){
    if ((vendor_config == NULL) || (ibeacon_adv_data == NULL) || (!memcmp(vendor_config->proximity_uuid, uuid_zeros, sizeof(uuid_zeros)))){
        return ESP_ERR_INVALID_ARG;
    }

    memcpy(&ibeacon_adv_data->ibeacon_head, &ibeacon_common_head, sizeof(esp_ble_ibeacon_head_t));
    memcpy(&ibeacon_adv_data->ibeacon_vendor, vendor_config, sizeof(esp_ble_ibeacon_vendor_t));

    return ESP_OK;
}