/**************************************************************************
 *
 * Copyright (C) 2005 Steve Karg <skarg@users.sourceforge.net>
 *
 * SPDX-License-Identifier: MIT
 *
 *********************************************************************/
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "bacnet/config.h"
#include "bacnet/basic/tsm/tsm.h"
#include "bacnet/bacdef.h"
#include "bacnet/bacdcode.h"
#include "bacnet/whois.h"
#include "bacnet/iam.h"
#include "bacnet/basic/object/device.h"
#include "bacnet/basic/services.h"
#include "bacnet/basic/tsm/tsm.h"

bool Send_I_Am_Flag = true;

void sendIamUnicast(uint8_t *buffer, BACNET_ADDRESS *src)
{
    BACNET_ADDRESS dest;
    int pdu_len = 0;
    BACNET_NPDU_DATA npdu_data;

    /* encode the data */
    int npdu_len = 0;
    int apdu_len = 0;
    BACNET_ADDRESS my_address;
    /* The destination will be the same as the src, so copy it over. */
    memcpy(&dest, src, sizeof(BACNET_ADDRESS));
    /* dest->net = 0; - no, must direct back to src->net to meet BTL tests */

    datalink_get_my_address(&my_address);
    /* encode the NPDU portion of the packet */
    npdu_encode_npdu_data(&npdu_data, false, MESSAGE_PRIORITY_NORMAL);
    npdu_len = npdu_encode_pdu(&buffer[0], &dest, &my_address, &npdu_data);
    /* encode the APDU portion of the packet */
    apdu_len =
        iam_encode_apdu(&buffer[npdu_len], Device_Object_Instance_Number(),
            MAX_APDU, SEGMENTATION_NONE, Device_Vendor_Identifier());
    /* send data */
    pdu_len = npdu_len + apdu_len;
    int bytes = datalink_send_pdu(&dest, &npdu_data, &buffer[0], pdu_len);
}

void handler_who_is(
    uint8_t *service_request, uint16_t service_len, BACNET_ADDRESS *src)
{
    int len = 0;
    int32_t low_limit = 0;
    int32_t high_limit = 0;
    int32_t target_device;

    len = whois_decode_service_request(
        service_request, service_len, &low_limit, &high_limit);
    if (len == 0) {
        sendIamUnicast(&Handler_Transmit_Buffer[0], src);
    } else if (len != -1) {
        /* is my device id within the limits? */
        target_device = Device_Object_Instance_Number();
        if ((target_device >= low_limit) && (target_device <= high_limit)) {
            sendIamUnicast(&Handler_Transmit_Buffer[0], src);
        }
    }

    return;
}