/**
 * Copyright (c) 2015 - 2018, Nordic Semiconductor ASA
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 * 
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 * 
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 * 
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 * 
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */
#include  "sdk_common.h"
#if NRF_MODULE_ENABLED(BLE_ADVERTISING)
#include "ble_advdata.h"
#include "ble_advertising.h"
#include "nrf_soc.h"
#include "nrf_log.h"
#include "nrf_fstorage.h"
#include "sdk_errors.h"
#include "nrf_sdh_ble.h"
#include "nrf_sdh_soc.h"

#define BLE_ADV_MODES (5) /**< Total number of possible advertising modes. */


/**@brief Function for checking if the whitelist is in use.
 *
 * @param[in] p_advertising Advertising module instance.
 */
static bool whitelist_has_entries(ble_advertising_t * const p_advertising)
{
    return p_advertising->whitelist_in_use;
}


/**@brief Function for checking if an address is valid.
 *
 * @param[in] p_addr Pointer to a bluetooth address.
 */
static bool addr_is_valid(uint8_t const * const p_addr)
{
    for (uint32_t i = 0; i < BLE_GAP_ADDR_LEN; i++)
    {
        if (p_addr[i] != 0)
        {
            return true;
        }
    }
    return false;
}


/**@brief Function for checking the next advertising mode.
 *
 * @param[in] adv_mode Current advertising mode.
 */
static ble_adv_mode_t adv_mode_next_get(ble_adv_mode_t adv_mode)
{
    return (ble_adv_mode_t)((adv_mode + 1) % BLE_ADV_MODES);
}


/**@brief Function for handling the Connected event.
 *
 * @param[in] p_ble_evt Event received from the BLE stack.
 */
static void on_connected(ble_advertising_t * const p_advertising, ble_evt_t const * p_ble_evt)
{
    if (p_ble_evt->evt.gap_evt.params.connected.role == BLE_GAP_ROLE_PERIPH)
    {
        p_advertising->current_slave_link_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
    }
}


/**@brief Function for handling the Disconnected event.
 *
 * @param[in] p_advertising Advertising module instance.
 * @param[in] p_ble_evt Event received from the BLE stack.
 */
static void on_disconnected(ble_advertising_t * const p_advertising, ble_evt_t const * p_ble_evt)
{
    uint32_t ret;

    p_advertising->whitelist_temporarily_disabled = false;

    if (p_ble_evt->evt.gap_evt.conn_handle == p_advertising->current_slave_link_conn_handle &&
        p_advertising->adv_modes_config.ble_adv_on_disconnect_disabled == false)
    {
       ret = ble_advertising_start(p_advertising, BLE_ADV_MODE_DIRECTED_HIGH_DUTY);
       if ((ret != NRF_SUCCESS) && (p_advertising->error_handler != NULL))
       {
           p_advertising->error_handler(ret);
       }
    }
}


/**@brief Function for handling the Timeout event.
 *
 * @param[in] p_advertising Advertising module instance.
 * @param[in] p_ble_evt Event received from the BLE stack.
 */
static void on_terminated(ble_advertising_t * const p_advertising, ble_evt_t const * p_ble_evt)
{
    ret_code_t ret;

    if (p_ble_evt->header.evt_id != BLE_GAP_EVT_ADV_SET_TERMINATED)
    {
        // Nothing to do.
        return;
    }

    if (  p_ble_evt->evt.gap_evt.params.adv_set_terminated.reason == BLE_GAP_EVT_ADV_SET_TERMINATED_REASON_TIMEOUT
        ||p_ble_evt->evt.gap_evt.params.adv_set_terminated.reason == BLE_GAP_EVT_ADV_SET_TERMINATED_REASON_LIMIT_REACHED)
    {
        // Start advertising in the next mode.
        ret = ble_advertising_start(p_advertising, adv_mode_next_get(p_advertising->adv_mode_current));

        if ((ret != NRF_SUCCESS) && (p_advertising->error_handler != NULL))
        {
            p_advertising->error_handler(ret);
        }
    }
}


/** @brief Function to determine if a flash write operation in in progress.
 *
 * @return true if a flash operation is in progress, false if not.
 */
static bool flash_access_in_progress()
{
    return nrf_fstorage_is_busy(NULL);
}


/**@brief Get the next available advertising mode.
 *
 * @param[in] p_advertising Advertising module instance.
 * @param[in] adv_mode Requested advertising mode.
 *
 * @returns adv_mode if possible, or the best available mode if not.
 */
static ble_adv_mode_t adv_mode_next_avail_get(ble_advertising_t * const p_advertising,
                                              ble_adv_mode_t            adv_mode)
{
    bool peer_addr_is_valid = addr_is_valid(p_advertising->peer_address.addr);

    // If a mode is disabled, continue to the next mode.

    switch (adv_mode)
    {
        case BLE_ADV_MODE_DIRECTED_HIGH_DUTY:
            if (   (p_advertising->adv_modes_config.ble_adv_directed_high_duty_enabled)
                && (!p_advertising->adv_modes_config.ble_adv_extended_enabled)
                && (peer_addr_is_valid))
            {
                return BLE_ADV_MODE_DIRECTED_HIGH_DUTY;
            }
            // Fallthrough.

        case BLE_ADV_MODE_DIRECTED:
            if ((p_advertising->adv_modes_config.ble_adv_directed_enabled) && peer_addr_is_valid)
            {
                return BLE_ADV_MODE_DIRECTED;
            }
            // Fallthrough.

        case BLE_ADV_MODE_FAST:
            if (p_advertising->adv_modes_config.ble_adv_fast_enabled)
            {
                return BLE_ADV_MODE_FAST;
            }
            // Fallthrough.

        case BLE_ADV_MODE_SLOW:
            if (p_advertising->adv_modes_config.ble_adv_slow_enabled)
            {
                return BLE_ADV_MODE_SLOW;
            }
            // Fallthrough.

        default:
            return BLE_ADV_MODE_IDLE;
    }
}


/**@brief Function for starting high duty directed advertising.
 *
 * @param[in]  p_advertising Advertising instance.
 * @param[out] p_adv_params Advertising parameters.
 *
 * @return NRF_SUCCESS
 */
static ret_code_t set_adv_mode_directed_high_duty(ble_advertising_t * const p_advertising,
                                                  ble_gap_adv_params_t    * p_adv_params)
{
    p_advertising->adv_evt    = BLE_ADV_EVT_DIRECTED_HIGH_DUTY;
    p_advertising->p_adv_data = NULL;

    p_adv_params->p_peer_addr     = &(p_advertising->peer_address);
    p_adv_params->interval        = 0;
    p_adv_params->properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_NONSCANNABLE_DIRECTED_HIGH_DUTY_CYCLE;
    p_adv_params->duration        = BLE_GAP_ADV_TIMEOUT_HIGH_DUTY_MAX;

    return NRF_SUCCESS;
}


/**@brief Function for starting directed slow advertising.
 *
 * @param[in]  p_advertising Advertising module instance.
 * @param[out] p_adv_params Advertising parameters.
 *
 * @return NRF_SUCCESS
 */
static ret_code_t set_adv_mode_directed(ble_advertising_t * const p_advertising,
                                        ble_gap_adv_params_t    * p_adv_params)
{
    p_advertising->adv_evt = BLE_ADV_EVT_DIRECTED;
#if !defined (S112)
    if (p_advertising->adv_modes_config.ble_adv_extended_enabled)
    {
        p_adv_params->properties.type = BLE_GAP_ADV_TYPE_EXTENDED_CONNECTABLE_NONSCANNABLE_DIRECTED;
    }
    else
    {
#endif // !defined (S112)
        p_adv_params->properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_NONSCANNABLE_DIRECTED;
#if !defined (S112)
    }
#endif // !defined (S112)
    p_adv_params->duration = p_advertising->adv_modes_config.ble_adv_directed_timeout;

    p_advertising->p_adv_data = NULL;

    p_adv_params->p_peer_addr = &p_advertising->peer_address;
    p_adv_params->interval    = p_advertising->adv_modes_config.ble_adv_directed_interval;

    return NRF_SUCCESS;
}


/**@brief Function for indicating whether to use whitelist for advertising.
 *
 * @param[in]  p_advertising Advertising module instance.
 *
 * @return Whether to use whitelist.
 */
static bool use_whitelist(ble_advertising_t * const p_advertising)
{
    return((p_advertising->adv_modes_config.ble_adv_whitelist_enabled) &&
           (!p_advertising->whitelist_temporarily_disabled) &&
           (whitelist_has_entries(p_advertising)));
}


/**@brief Function for setting new advertising flags in the advertising parameters.
 *
 * @param[in]  p_advertising Advertising module instance.
 * @param[in]  flags         New flags.
 *
 * @return Any error from @ref sd_ble_gap_adv_set_configure.
 */
static ret_code_t flags_set(ble_advertising_t * const p_advertising, uint8_t flags)
{
    uint8_t * p_flags = ble_advdata_parse(p_advertising->adv_data.adv_data.p_data,
                                          p_advertising->adv_data.adv_data.len,
                                          BLE_GAP_AD_TYPE_FLAGS);

    if (p_flags != NULL)
    {
        *p_flags = flags;
    }

    return sd_ble_gap_adv_set_configure(&p_advertising->adv_handle, &p_advertising->adv_data, &p_advertising->adv_params);
}


/**@brief Function for starting fast advertising.
 *
 * @param[in]  p_advertising Advertising module instance.
 * @param[out] p_adv_params Advertising parameters.
 *
 * @return NRF_SUCCESS or an error from @ref flags_set().
 */
static ret_code_t set_adv_mode_fast(ble_advertising_t * const p_advertising,
                                    ble_gap_adv_params_t    * p_adv_params)
{
    ret_code_t ret;

    p_adv_params->interval = p_advertising->adv_modes_config.ble_adv_fast_interval;
    p_adv_params->duration = p_advertising->adv_modes_config.ble_adv_fast_timeout;

#if !defined (S112)
    if (p_advertising->adv_modes_config.ble_adv_extended_enabled)
    {
        p_advertising->adv_params.properties.type = BLE_GAP_ADV_TYPE_EXTENDED_CONNECTABLE_NONSCANNABLE_UNDIRECTED;
    }
    else
    {
#endif // !defined (S112)
        p_advertising->adv_params.properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED;
#if !defined (S112)
    }
#endif // !defined (S112)
 
    if (use_whitelist(p_advertising))
    {
        p_adv_params->filter_policy = BLE_GAP_ADV_FP_FILTER_CONNREQ;

        // Set correct flags.
        ret = flags_set(p_advertising, BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED);
        VERIFY_SUCCESS(ret);

        p_advertising->adv_evt = BLE_ADV_EVT_FAST_WHITELIST;
    }
    else
    {
        p_advertising->adv_evt = BLE_ADV_EVT_FAST;
    }
    p_advertising->p_adv_data = &(p_advertising->adv_data);
    return NRF_SUCCESS;
}


/**@brief Function for starting slow advertising.
 *
 * @param[in]  p_advertising Advertising module instance.
 * @param[out] p_adv_params Advertising parameters.
 *
 * @return NRF_SUCCESS or an error from @ref flags_set().
 */
static ret_code_t set_adv_mode_slow(ble_advertising_t * const p_advertising,
                                    ble_gap_adv_params_t    * p_adv_params)
{
    ret_code_t ret;

    p_adv_params->interval = p_advertising->adv_modes_config.ble_adv_slow_interval;
    p_adv_params->duration = p_advertising->adv_modes_config.ble_adv_slow_timeout;

#if !defined (S112)
    if (p_advertising->adv_modes_config.ble_adv_extended_enabled)
    {
        p_advertising->adv_params.properties.type = BLE_GAP_ADV_TYPE_EXTENDED_CONNECTABLE_NONSCANNABLE_UNDIRECTED;
    }
    else
    {
#endif // !defined (S112)
        p_advertising->adv_params.properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED;
#if !defined (S112)
    }
#endif // !defined (S112)

    if (use_whitelist(p_advertising))
    {
        p_adv_params->filter_policy = BLE_GAP_ADV_FP_FILTER_CONNREQ;

        // Set correct flags.
        ret = flags_set(p_advertising, BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED);
        VERIFY_SUCCESS(ret);

        p_advertising->adv_evt = BLE_ADV_EVT_SLOW_WHITELIST;
    }
    else
    {
        p_advertising->adv_evt = BLE_ADV_EVT_SLOW;
    }
    p_advertising->p_adv_data = &(p_advertising->adv_data);
    return NRF_SUCCESS;
}


/**@brief Function for checking if an advertising module configuration is legal.
 *
 * @details Advertising module can not be initialized if high duty directed advertising is used
 *          together with extended advertising.
 *
 * @param[in] p_config Pointer to the configuration.
 *
 * @return True  If the configuration is valid.
 * @return False If the configuration is invalid.
 */
static bool config_is_valid(ble_adv_modes_config_t const * const p_config)
{
    if ((p_config->ble_adv_directed_high_duty_enabled == true) &&
        (p_config->ble_adv_extended_enabled == true))
    {
        return false;
    }
#if !defined (S140)
    else if ( p_config->ble_adv_primary_phy == BLE_GAP_PHY_CODED ||
              p_config->ble_adv_secondary_phy == BLE_GAP_PHY_CODED)
    {
        return false;
    }
#endif // !defined (S140)
    else
    {
        return true;
    }
}


void ble_advertising_conn_cfg_tag_set(ble_advertising_t * const p_advertising,
                                      uint8_t                   ble_cfg_tag)
{
    p_advertising->conn_cfg_tag = ble_cfg_tag;
}


uint32_t ble_advertising_init(ble_advertising_t            * const p_advertising,
                              ble_advertising_init_t const * const p_init)
{
    uint32_t ret;
    if ((p_init == NULL) || (p_advertising == NULL))
    {
        return NRF_ERROR_NULL;
    }
    if (!config_is_valid(&p_init->config))
    {
        return NRF_ERROR_INVALID_PARAM;
    }

    p_advertising->adv_mode_current               = BLE_ADV_MODE_IDLE;
    p_advertising->adv_modes_config               = p_init->config;
    p_advertising->conn_cfg_tag                   = BLE_CONN_CFG_TAG_DEFAULT;
    p_advertising->evt_handler                    = p_init->evt_handler;
    p_advertising->error_handler                  = p_init->error_handler;
    p_advertising->current_slave_link_conn_handle = BLE_CONN_HANDLE_INVALID;
    p_advertising->p_adv_data                     = &p_advertising->adv_data;

    memset(&p_advertising->peer_address, 0, sizeof(p_advertising->peer_address));

    // Copy advertising data.
    if (!p_advertising->initialized)
    {
        p_advertising->adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET;
    }
    p_advertising->adv_data.adv_data.p_data = p_advertising->enc_advdata;
    p_advertising->adv_data.adv_data.len    = BLE_GAP_ADV_SET_DATA_SIZE_MAX;

    ret = ble_advdata_encode(&p_init->advdata, p_advertising->enc_advdata, &p_advertising->adv_data.adv_data.len);
    VERIFY_SUCCESS(ret);

    if (&p_init->srdata != NULL)
    {
        p_advertising->adv_data.scan_rsp_data.p_data = p_advertising->enc_scan_rsp_data;
        p_advertising->adv_data.scan_rsp_data.len    = BLE_GAP_ADV_SET_DATA_SIZE_MAX;

        ret = ble_advdata_encode(&p_init->srdata,
                                  p_advertising->adv_data.scan_rsp_data.p_data,
                                 &p_advertising->adv_data.scan_rsp_data.len);
        VERIFY_SUCCESS(ret);
    }
    else
    {
        p_advertising->adv_data.scan_rsp_data.p_data = NULL;
        p_advertising->adv_data.scan_rsp_data.len    = 0;
    }

    // Configure a initial advertising configuration. The advertising data and and advertising
    // parameters will be changed later when we call @ref ble_advertising_start, but must be set
    // to legal values here to define an advertising handle.
    p_advertising->adv_params.primary_phy     = BLE_GAP_PHY_1MBPS;
    p_advertising->adv_params.duration        = p_advertising->adv_modes_config.ble_adv_fast_timeout;
    p_advertising->adv_params.properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED;
    p_advertising->adv_params.p_peer_addr     = NULL;
    p_advertising->adv_params.filter_policy   = BLE_GAP_ADV_FP_ANY;
    p_advertising->adv_params.interval        = p_advertising->adv_modes_config.ble_adv_fast_interval;

    ret = sd_ble_gap_adv_set_configure(&p_advertising->adv_handle, NULL, &p_advertising->adv_params);
    VERIFY_SUCCESS(ret);

    p_advertising->initialized = true;
    return ret;
}


/**@brief Function for checking that a phy define value matches one of the valid phys from the SD.
 *
 * @param[in]  PHY to be validated.
 *
 * @retval true  If the PHY value is valid (1mbit, 2mbit, coded).
 * @retval false If the PHY value is invalid.
 */
static bool phy_is_valid(uint32_t const * const p_phy)
{
    if ((*p_phy) == BLE_GAP_PHY_1MBPS ||
        (*p_phy) == BLE_GAP_PHY_2MBPS
#if defined (S140)
     || (*p_phy) == BLE_GAP_PHY_CODED
#endif // !defined (S140)
        )
    {
        return true;
    }
    else
    {
        return false;
    }
}


uint32_t ble_advertising_start(ble_advertising_t * const p_advertising,
                               ble_adv_mode_t            advertising_mode)
{
    uint32_t ret;

    if (p_advertising->initialized == false)
    {
        return NRF_ERROR_INVALID_STATE;
    }

    p_advertising->adv_mode_current = advertising_mode;

    // Delay starting advertising until the flash operations are complete.
    if (flash_access_in_progress())
    {
        p_advertising->advertising_start_pending = true;
        return NRF_SUCCESS;
    }

   memset(&p_advertising->peer_address, 0, sizeof(p_advertising->peer_address));

    if (  ((p_advertising->adv_modes_config.ble_adv_directed_high_duty_enabled) && (p_advertising->adv_mode_current == BLE_ADV_MODE_DIRECTED_HIGH_DUTY))
        ||((p_advertising->adv_modes_config.ble_adv_directed_enabled)           && (p_advertising->adv_mode_current == BLE_ADV_MODE_DIRECTED_HIGH_DUTY))
        ||((p_advertising->adv_modes_config.ble_adv_directed_enabled)           && (p_advertising->adv_mode_current == BLE_ADV_MODE_DIRECTED))
       )
    {
        if (p_advertising->evt_handler != NULL)
        {
            p_advertising->peer_addr_reply_expected = true;
            p_advertising->evt_handler(BLE_ADV_EVT_PEER_ADDR_REQUEST);
        }
        else
        {
            p_advertising->peer_addr_reply_expected = false;
        }
    }

    p_advertising->adv_mode_current = adv_mode_next_avail_get(p_advertising, advertising_mode);

    // Fetch the whitelist.
    if ((p_advertising->evt_handler != NULL) &&
        (p_advertising->adv_mode_current == BLE_ADV_MODE_FAST || p_advertising->adv_mode_current == BLE_ADV_MODE_SLOW) &&
        (p_advertising->adv_modes_config.ble_adv_whitelist_enabled) &&
        (!p_advertising->whitelist_temporarily_disabled))
    {
        p_advertising->whitelist_in_use         = false;
        p_advertising->whitelist_reply_expected = true;
        p_advertising->evt_handler(BLE_ADV_EVT_WHITELIST_REQUEST);
    }
    else
    {
        p_advertising->whitelist_reply_expected = false;
    }

    // Initialize advertising parameters with default values.
    memset(&p_advertising->adv_params, 0, sizeof(p_advertising->adv_params));

    p_advertising->adv_params.properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED;

    // Use 1MBIT as primary phy if no phy was selected.
    if (phy_is_valid(&p_advertising->adv_modes_config.ble_adv_primary_phy))
    {
        p_advertising->adv_params.primary_phy = p_advertising->adv_modes_config.ble_adv_primary_phy;
    }
    else
    {
        p_advertising->adv_params.primary_phy = BLE_GAP_PHY_1MBPS;
    }

    if (p_advertising->adv_modes_config.ble_adv_extended_enabled)
    {
        // Use 1MBIT as secondary phy if no phy was selected.
        if (phy_is_valid(&p_advertising->adv_modes_config.ble_adv_primary_phy))
        {
            p_advertising->adv_params.secondary_phy = p_advertising->adv_modes_config.ble_adv_secondary_phy;
        }
        else
        {
            p_advertising->adv_params.secondary_phy = BLE_GAP_PHY_1MBPS;
        }
    }
    p_advertising->adv_params.filter_policy = BLE_GAP_ADV_FP_ANY;

    // Set advertising parameters and events according to selected advertising mode.
    switch (p_advertising->adv_mode_current)
    {
        case BLE_ADV_MODE_DIRECTED_HIGH_DUTY:
            ret = set_adv_mode_directed_high_duty(p_advertising, &p_advertising->adv_params);
            break;

        case BLE_ADV_MODE_DIRECTED:
            ret = set_adv_mode_directed(p_advertising, &p_advertising->adv_params);
            break;

        case BLE_ADV_MODE_FAST:
            ret = set_adv_mode_fast(p_advertising, &p_advertising->adv_params);
            break;

        case BLE_ADV_MODE_SLOW:
            ret = set_adv_mode_slow(p_advertising, &p_advertising->adv_params);
            break;

        case BLE_ADV_MODE_IDLE:
            p_advertising->adv_evt = BLE_ADV_EVT_IDLE;
            break;

        default:
            break;
    }

    if (p_advertising->adv_mode_current != BLE_ADV_MODE_IDLE)
    {

        ret = sd_ble_gap_adv_set_configure(&p_advertising->adv_handle, p_advertising->p_adv_data, &p_advertising->adv_params);
        if (ret != NRF_SUCCESS)
        {
            return ret;
        }
        ret = sd_ble_gap_adv_start(p_advertising->adv_handle, p_advertising->conn_cfg_tag);

        if (ret != NRF_SUCCESS)
        {
            return ret;
        }
    }

    if (p_advertising->evt_handler != NULL)
    {
        p_advertising->evt_handler(p_advertising->adv_evt);
    }

    return NRF_SUCCESS;
}


void ble_advertising_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
{
    ble_advertising_t * p_advertising = (ble_advertising_t *)p_context;

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            on_connected(p_advertising, p_ble_evt);
            break;

        // Upon disconnection, whitelist will be activated and direct advertising is started.
        case BLE_GAP_EVT_DISCONNECTED:
            on_disconnected(p_advertising, p_ble_evt);
            break;

        // Upon terminated advertising (time-out), the next advertising mode is started.
        case BLE_GAP_EVT_ADV_SET_TERMINATED:
            on_terminated(p_advertising, p_ble_evt);
            break;

        default:
            break;
    }
}


void ble_advertising_on_sys_evt(uint32_t evt_id, void * p_context)
{
    ble_advertising_t * p_advertising = (ble_advertising_t *)p_context;

    switch (evt_id)
    {
        //When a flash operation finishes, re-attempt to start advertising operations.
        case NRF_EVT_FLASH_OPERATION_SUCCESS:
        case NRF_EVT_FLASH_OPERATION_ERROR:
        {
            if (p_advertising->advertising_start_pending)
            {
                p_advertising->advertising_start_pending = false;
                ret_code_t ret = ble_advertising_start(p_advertising,
                                                       p_advertising->adv_mode_current);

                if ((ret != NRF_SUCCESS) && (p_advertising->error_handler != NULL))
                {
                    p_advertising->error_handler(ret);
                }
            }
        } break;

        default:
            // No implementation needed.
            break;
    }
}


uint32_t ble_advertising_peer_addr_reply(ble_advertising_t * const p_advertising,
                                         ble_gap_addr_t          * p_peer_address)
{
    if (!p_advertising->peer_addr_reply_expected)
    {
        return NRF_ERROR_INVALID_STATE;
    }

    p_advertising->peer_addr_reply_expected = false;

    memcpy(&p_advertising->peer_address, p_peer_address, sizeof(p_advertising->peer_address));

    return NRF_SUCCESS;
}


uint32_t ble_advertising_whitelist_reply(ble_advertising_t * const p_advertising,
                                         ble_gap_addr_t    const * p_gap_addrs,
                                         uint32_t               addr_cnt,
                                         ble_gap_irk_t  const * p_gap_irks,
                                         uint32_t               irk_cnt)
{
    if (!p_advertising->whitelist_reply_expected)
    {
        return NRF_ERROR_INVALID_STATE;
    }

    p_advertising->whitelist_reply_expected = false;
    p_advertising->whitelist_in_use         = ((addr_cnt > 0) || (irk_cnt > 0));

    return NRF_SUCCESS;
}


uint32_t ble_advertising_restart_without_whitelist(ble_advertising_t * const p_advertising)
{
    ret_code_t ret;

    (void) sd_ble_gap_adv_stop(p_advertising->adv_handle);

    p_advertising->whitelist_temporarily_disabled = true;
    p_advertising->whitelist_in_use               = false;
    p_advertising->adv_params.filter_policy       = BLE_GAP_ADV_FP_ANY;
    // Set correct flags.
    ret = flags_set(p_advertising, BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
    VERIFY_SUCCESS(ret);

    ret = ble_advertising_start(p_advertising, p_advertising->adv_mode_current);
    if ((ret != NRF_SUCCESS) && (p_advertising->error_handler != NULL))
    {
        p_advertising->error_handler(ret);
    }

    return NRF_SUCCESS;
}


void ble_advertising_modes_config_set(ble_advertising_t            * const p_advertising,
                                      ble_adv_modes_config_t const * const p_adv_modes_config)
{
    p_advertising->adv_modes_config = *p_adv_modes_config;
}


#endif // NRF_MODULE_ENABLED(BLE_ADVERTISING)