/**
 * Copyright (c) 2017 - 2020, 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
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 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * 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.
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 */

/**
 * @brief BLE Object Transfer Service server application main file.
 *
 * This file contains the source code for a sample Object Transfer Service server application.
 */


#include <stdint.h>
#include "ble.h"
#include "nrf.h"
#include "ble_ots.h"
#include "ble_hci.h"
#include "bsp.h"
#include "ble_advertising.h"
#include "ble_conn_params.h"
#include "app_timer.h"
#include "nrf_sdh.h"
#include "nrf_sdh_ble.h"
#include "nrf_sdh_soc.h"
#include "nrf_ble_qwr.h"
#include "nrf_pwr_mgmt.h"

#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"


#define DEVICE_NAME                          "Nordic_OTS"                      /**< Name of device. Will be included in the advertising data. */

#define APP_BLE_OBSERVER_PRIO                3                                 /**< Application's BLE observer priority. You shouldn't need to modify this value. */

#define APP_ADV_INTERVAL                     40                                /**< The advertising interval (in units of 0.625 ms. This value corresponds to 25 ms). */
#define APP_ADV_DURATION                     18000                             /**< The advertising duration (180 seconds) in units of 10 milliseconds. */
#define MIN_CONN_INTERVAL                    MSEC_TO_UNITS(10, UNIT_1_25_MS)   /**< Minimum acceptable connection interval (0.5 seconds). */
#define MAX_CONN_INTERVAL                    MSEC_TO_UNITS(1000, UNIT_1_25_MS) /**< Maximum acceptable connection interval (1 second). */
#define SLAVE_LATENCY                        0                                 /**< Slave latency. */
#define CONN_SUP_TIMEOUT                     MSEC_TO_UNITS(4000, UNIT_10_MS)   /**< Connection supervisory timeout (4 seconds). */

#define FIRST_CONN_PARAMS_UPDATE_DELAY       APP_TIMER_TICKS(5000)             /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY        APP_TIMER_TICKS(5000)             /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT         3                                 /**< Number of attempts before giving up the connection parameter negotiation. */

#define DEAD_BEEF                            0xDEADBEEF                        /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */
#define APP_BLE_CONN_CFG_TAG                 1
#define MAX_ALLOCATED_OBJECT_SIZE            1024
#define L2CAP_RX_MPS                         60                                /**< Size of L2CAP Rx MPS (must be at least BLE_L2CAP_MPS_MIN).*/
#define L2CAP_TX_MPS                         40                                /**< Size of L2CAP Tx MPS (must be at least BLE_L2CAP_MPS_MIN).*/
#define L2CAP_RX_MTU                         30                                /**< Rx L2CAP MTU size (must be at least BLE_L2CAP_MTU_MIN).*/
                                                                               
BLE_ADVERTISING_DEF(m_advertising);                                            /**< Advertising module instance. */
BLE_OTS_DEF(m_ots);                                                            /**< Object transfer service instance. */
NRF_BLE_QWR_DEF(m_qwr);                                                        /**< Context for the Queued Write module.*/
NRF_BLE_GQ_DEF(m_ble_gatt_queue,                                               /**< BLE GATT Queue instance. */
               NRF_SDH_BLE_PERIPHERAL_LINK_COUNT,                           
               NRF_BLE_GQ_QUEUE_SIZE);

static uint16_t         m_conn_handle;
static ble_ots_object_t m_ots_object;
static uint8_t          m_l2cap_buffer[MAX_ALLOCATED_OBJECT_SIZE];

static ble_uuid_t m_adv_uuids[] =           /**< Universally unique service identifiers. */
{
    {BLE_UUID_OTS_SERVICE, BLE_UUID_TYPE_BLE}
};


/**@brief Callback function for asserts in the SoftDevice.
 *
 * @details This function will be called in case of an assert in the SoftDevice.
 *
 * @warning This handler is an example only and does not fit a final product. You need to analyze
 *          how your product is supposed to react in case of Assert.
 * @warning On assert from the SoftDevice, the system can only recover on reset.
 *
 * @param[in]   line_num   Line number of the failing ASSERT call.
 * @param[in]   file_name  File name of the failing ASSERT call.
 */
void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
{
    app_error_handler(DEAD_BEEF, line_num, p_file_name);
}


/**@brief Function for the GAP initialization.
 *
 * @details This function sets up all the necessary GAP (Generic Access Profile) parameters of the
 *          device including the device name, appearance, and the preferred connection parameters.
 */
static void gap_params_init(void)
{
    uint32_t                err_code;
    ble_gap_conn_params_t   gap_conn_params;
    ble_gap_conn_sec_mode_t sec_mode;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);

    err_code = sd_ble_gap_device_name_set(&sec_mode,
                                          (const uint8_t *)DEVICE_NAME,
                                          strlen(DEVICE_NAME));
    APP_ERROR_CHECK(err_code);

    err_code = sd_ble_gap_appearance_set(BLE_APPEARANCE_HEART_RATE_SENSOR_HEART_RATE_BELT);
    APP_ERROR_CHECK(err_code);

    memset(&gap_conn_params, 0, sizeof(gap_conn_params));

    gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
    gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
    gap_conn_params.slave_latency     = SLAVE_LATENCY;
    gap_conn_params.conn_sup_timeout  = CONN_SUP_TIMEOUT;

    err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling Queued Write Module errors.
 *
 * @details A pointer to this function will be passed to each service which may need to inform the
 *          application about an error.
 *
 * @param[in]   nrf_error   Error code containing information about what went wrong.
 */
static void nrf_qwr_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}


static void ble_ots_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}


static void print_object_data(ble_ots_object_t * p_ots_obj)
{
    NRF_LOG_INFO("Object data (size %i):", p_ots_obj->current_size);
    uint32_t size_to_display = p_ots_obj->current_size;
    if (size_to_display >= NRF_LOG_BACKEND_UART_TEMP_BUFFER_SIZE)
    {
        size_to_display = NRF_LOG_BACKEND_UART_TEMP_BUFFER_SIZE / 2;
        size_to_display  --;
        NRF_LOG_INFO("First %i bytes of the object:", size_to_display);
        NRF_LOG_HEXDUMP_INFO(p_ots_obj->data, size_to_display);
        NRF_LOG_INFO("Last %i bytes of the object:", size_to_display);
        NRF_LOG_HEXDUMP_INFO(&p_ots_obj->data[p_ots_obj->current_size - size_to_display], size_to_display);
    }
    else
    {
        NRF_LOG_HEXDUMP_INFO(p_ots_obj->data, size_to_display);
    }
}


static void ble_ots_evt_handler(ble_ots_t * p_ots, ble_ots_evt_t * p_evt)
{
    switch (p_evt->type)
    {
        case BLE_OTS_EVT_OACP:
            NRF_LOG_INFO("Got oacp event %i", p_evt->evt.oacp_evt.type);

            switch (p_evt->evt.oacp_evt.type)
            {
                case BLE_OTS_OACP_EVT_REQ_READ:
                    break;
                case BLE_OTS_OACP_EVT_INCREASE_ALLOC_LEN:
                    break;
                case BLE_OTS_OACP_EVT_ABORT:
                    break;
                case BLE_OTS_OACP_EVT_EXECUTE:
                    break;
                case BLE_OTS_OACP_EVT_REQ_WRITE:
                    break;
            }
            break;

        case BLE_OTS_EVT_OBJECT:
            NRF_LOG_INFO("Got object event %d, name: %s", (uint32_t)p_evt->evt.object_evt.type, (uint32_t)p_evt->evt.object_evt.evt.p_object->name);
            break;
        case BLE_OTS_EVT_INDICATION_ENABLED:
            NRF_LOG_INFO("Indications Enabled");
            break;
        case BLE_OTS_EVT_INDICATION_DISABLED:
            NRF_LOG_INFO("Indications Disabled");
            break;
        case BLE_OTS_EVT_OBJECT_RECEIVED:
            print_object_data(&m_ots_object);
            break;
        default:
            // no implementation needed
            break;
    }
}


/**@brief Function for initializing services that will be used by the application.
 *
 * @details Initialize the Object Transfer service.
 */
static void services_init(void)
{
    uint32_t           err_code;
    ble_ots_init_t     ots_init;
    nrf_ble_qwr_init_t qwr_init = {0};

    // Initialize Queued Write Module.
    qwr_init.error_handler = nrf_qwr_error_handler;

    err_code = nrf_ble_qwr_init(&m_qwr, &qwr_init);
    APP_ERROR_CHECK(err_code);

    // Initialize OTS.

    memset(&ots_init, 0x00, sizeof(ots_init));

    ots_init.error_handler     = ble_ots_error_handler;
    ots_init.evt_handler       = ble_ots_evt_handler;
    ots_init.p_object          = &m_ots_object;
    ots_init.p_gatt_queue      = &m_ble_gatt_queue;

    ots_init.feature_char_read_access = SEC_OPEN;

    memset(&m_ots_object, 0, sizeof(m_ots_object));
    //Initialize our object.
    m_ots_object.is_valid                              = true;
    m_ots_object.properties.decoded.is_write_permitted = true;
    m_ots_object.properties.decoded.is_read_permitted  = true;
    m_ots_object.is_locked                             = false;
    m_ots_object.alloc_len                             = MAX_ALLOCATED_OBJECT_SIZE;

    ots_init.object_chars_init.p_ots = &m_ots;
    ots_init.object_chars_init.name_read_access = SEC_OPEN;
    ots_init.object_chars_init.type_read_access = SEC_OPEN;
    ots_init.object_chars_init.size_read_access = SEC_OPEN;
    ots_init.object_chars_init.properties_read_access = SEC_OPEN;

    ots_init.oacp_init.p_ots            = &m_ots;
    ots_init.oacp_init.l2cap_buffer_len = sizeof(m_ots_object);
    ots_init.oacp_init.p_l2cap_buffer   = m_l2cap_buffer;

    ots_init.oacp_init.write_access      = SEC_OPEN;
    ots_init.oacp_init.cccd_write_access = SEC_OPEN;

    ots_init.rx_mps = L2CAP_RX_MPS;
    ots_init.rx_mtu = L2CAP_RX_MTU;

    err_code = ble_ots_init(&m_ots, &ots_init);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling the Connection Parameters Module.
 *
 * @details This function will be called for all events in the Connection Parameters Module which
 *          are passed to the application.
 *          @note All this function does is to disconnect. This could have been done by simply
 *                setting the disconnect_on_fail config parameter, but instead we use the event
 *                handler mechanism to demonstrate its use.
 *
 * @param[in] p_evt  Event received from the Connection Parameters Module.
 */
static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)
{
    uint32_t err_code;

    if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
    {
        err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
        APP_ERROR_CHECK(err_code);
    }
}


/**@brief Function for handling a Connection Parameters error.
 *
 * @param[in] nrf_error  Error code containing information about what went wrong.
 */
static void conn_params_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}


/**@brief Function for initializing the Connection Parameters module.
 */
static void conn_params_init(void)
{
    uint32_t               err_code;
    ble_conn_params_init_t cp_init;

    memset(&cp_init, 0, sizeof(cp_init));

    cp_init.p_conn_params                  = NULL;
    cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
    cp_init.next_conn_params_update_delay  = NEXT_CONN_PARAMS_UPDATE_DELAY;
    cp_init.max_conn_params_update_count   = MAX_CONN_PARAMS_UPDATE_COUNT;
    cp_init.start_on_notify_cccd_handle    = BLE_GATT_HANDLE_INVALID;
    cp_init.disconnect_on_fail             = false;
    cp_init.evt_handler                    = on_conn_params_evt;
    cp_init.error_handler                  = conn_params_error_handler;

    err_code = ble_conn_params_init(&cp_init);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling advertising events.
 *
 * @details This function will be called for advertising events which are passed to the application.
 *
 * @param[in] ble_adv_evt  Advertising event.
 */
static void on_adv_evt(ble_adv_evt_t ble_adv_evt)
{
    uint32_t err_code;

    switch (ble_adv_evt)
    {
        case BLE_ADV_EVT_FAST:
            err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
            APP_ERROR_CHECK(err_code);
            break;
        default:
            break;
    }
}

/**@brief Function for initializing the Advertising functionality.
 */
static void advertising_init(void)
{
    uint32_t               err_code;
    ble_advertising_init_t init;

    memset(&init, 0, sizeof(init));

    init.advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance      = true;
    init.advdata.flags                   = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
    init.advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.advdata.uuids_complete.p_uuids  = m_adv_uuids;

    init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;

    init.evt_handler = on_adv_evt;

    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}


/**@brief Function for handling BLE events.
 *
 * @param[in]   p_ble_evt   Bluetooth stack event.
 * @param[in]   p_context   Unused.
 */
static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
    uint32_t err_code;
    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            NRF_LOG_INFO("Peer Connected.");
            err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
            APP_ERROR_CHECK(err_code);
            m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
            err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GAP_EVT_DISCONNECTED:
            NRF_LOG_INFO("Disconnected. conn_handle: 0x%x, reason: 0x%x",
                         p_ble_evt->evt.gap_evt.conn_handle,
                         p_ble_evt->evt.gap_evt.params.disconnected.reason);
            m_conn_handle = BLE_CONN_HANDLE_INVALID;
            break;

        case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
        {
            NRF_LOG_DEBUG("PHY update request.");
            ble_gap_phys_t const phys =
            {
                .rx_phys = BLE_GAP_PHY_AUTO,
                .tx_phys = BLE_GAP_PHY_AUTO,
            };
            err_code = sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys);
            APP_ERROR_CHECK(err_code);
        } break;

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


/**@brief Function for initializing the BLE stack.
 *
 * @details Initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    ret_code_t err_code;

    err_code = nrf_sdh_enable_request();
    APP_ERROR_CHECK(err_code);

    // Fetch the start address of the application RAM.
    uint32_t ram_start = 0;
    err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
    APP_ERROR_CHECK(err_code);

    // Overwrite some of the default configurations for the BLE stack.
    ble_cfg_t ble_cfg;

    // Configure the number of custom UUIDS.
    memset(&ble_cfg, 0x00, sizeof(ble_cfg));
    ble_cfg.common_cfg.vs_uuid_cfg.vs_uuid_count = 0;

    // Set l2cap channel configuration
    ble_cfg.conn_cfg.conn_cfg_tag                        = APP_BLE_CONN_CFG_TAG;
    ble_cfg.conn_cfg.params.l2cap_conn_cfg.rx_mps        = L2CAP_RX_MPS;
    ble_cfg.conn_cfg.params.l2cap_conn_cfg.rx_queue_size = 1;
    ble_cfg.conn_cfg.params.l2cap_conn_cfg.tx_mps        = L2CAP_TX_MPS;
    ble_cfg.conn_cfg.params.l2cap_conn_cfg.tx_queue_size = 1;
    ble_cfg.conn_cfg.params.l2cap_conn_cfg.ch_count      = 1;

    err_code = sd_ble_cfg_set(BLE_CONN_CFG_L2CAP, &ble_cfg, ram_start);
    APP_ERROR_CHECK(err_code);

    // Enable BLE stack.
    err_code = nrf_sdh_ble_enable(&ram_start);
    APP_ERROR_CHECK(err_code);

    // Register a handler for BLE events.
    NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);

}


/**@brief Function for handling events from the BSP module.
 *
 * @param[in]   event   Event generated by button press.
 */
void bsp_event_handler(bsp_event_t event)
{
    uint32_t err_code;
    switch (event)
    {
        case BSP_EVENT_DISCONNECT:
            err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;

        case BSP_EVENT_WHITELIST_OFF:
            err_code = ble_advertising_restart_without_whitelist(&m_advertising);
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;

        default:
            break;
    }
}


/**@brief Function for initializing logging.
 */
static void log_init(void)
{
    ret_code_t err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);
    NRF_LOG_DEFAULT_BACKENDS_INIT();
}


/**@brief Function for the Timer initialization.
 *
 * @details Initializes the timer module. This creates and starts application timers.
 */
static void timers_init(void)
{
    ret_code_t err_code;

    // Initialize timer module.
    err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing buttons and leds.
 *
 * @param[out] p_erase_bonds  Will be true if the clear bonding button was pressed to wake the application up.
 */
static void buttons_leds_init(void)
{
    uint32_t err_code = bsp_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS, bsp_event_handler);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing power management.
 */
static void power_management_init(void)
{
    ret_code_t err_code;
    err_code = nrf_pwr_mgmt_init();
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling the idle state (main loop).
 *
 * @details If there is no pending log operation, then sleep until next the next event occurs.
 */
static void idle_state_handle(void)
{
    if (NRF_LOG_PROCESS() == false)
    {
        nrf_pwr_mgmt_run();
    }
}


static void advertising_start(void)
{
    uint32_t err_code;
    err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for application main entry.
 */
int main(void)
{
    // Initialize.
    log_init();
    timers_init();
    buttons_leds_init();
    power_management_init();
    ble_stack_init();
    gap_params_init();
    advertising_init();
    services_init();
    conn_params_init();

    // Start execution.
    NRF_LOG_INFO("Object Transfer server example started.");
    advertising_start();

    // Enter main loop.
    for (;;)
    {
        idle_state_handle();
    }
}


