// vi: ts=4 sw=4 noet:
/*
==================================================================================
	Copyright (c) 2021 AT&T Intellectual Property.
	Copyright (c) 2021 Alexandre Huff.

   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.
==================================================================================
*/

/*
	Mnemonic:	ad_xapp.cpp
	Abstract:   Simulates the AD xApp sending an anomaly dectection message to
                the TS xApp. It sends one message and exits.

	Date:		20 May 2021
	Author:		Alexandre Huff
*/

#include <iostream>
#include <memory>
#include <thread>
#include <unistd.h>
#include <string.h>

#include <rmr/RIC_message_types.h>
#include "ricxfcpp/xapp.hpp"

using namespace std;
using namespace xapp;

unique_ptr<Xapp> xfw;

void ts_callback( Message& mbuf, int mtype, int subid, int len, Msg_component payload,  void* data ) {
    cout << "[AD] TS Callback got a message, type=" << mtype << ", length=" << len << "\n";
    cout << "[AD] Payload  is  " << payload.get() << endl;

    // we only send one message, so we expect to receive only one as well
    xfw->Stop();
}

// this thread just sends out one anomaly message to the TS xApp
void ad_loop() {
    std::unique_ptr<Message> msg;
    Msg_component payload;
    int size;
    int plen;

    cout << "[AD] In Anomaly Detection ad_loop()\n";
    sleep( 1 ); // just wait receiver thread starting up

    msg = xfw->Alloc_msg(2048);
    size = msg->Get_available_size();
    if ( size < 2048 ) {
        cout << "[ERROR] Message returned does not have enough size: " << size << " < 2048" << endl;
        exit(1);
    }

    // the message we are sending
    const char *ad_msg = "[{\"du-id\": 1010, \"ue-id\": \"Train passenger 2\", \"measTimeStampRf\": 1620835470108, \"Degradation\": \"RSRP RSSINR\"}]";

    payload = msg->Get_payload();
    snprintf( (char *) payload.get(), 2048, "%s", ad_msg );

    /*
        we are sending a string, so we have to include the nil byte to send with RMR and keep
        things simple in the receiver side
   */
    plen = strlen( (char *) payload.get() ) + 1;
    cout << "[AD] Sending a message to TS, length: " << plen << "\n";
    cout << "[AD] Message body " << payload.get() << endl;

    // payload updated in place, nothing to copy from, so payload parm is nil
    if ( ! msg->Send_msg( TS_ANOMALY_UPDATE, Message::NO_SUBID, plen, nullptr ) ) // msg type 30003
        cout << "[ERROR] Unable to send a message to TS xApp, state: " << msg->Get_state() << endl;
}

int main(int argc, char const *argv[]) {
    int nthreads = 1;

    char* port = (char *) "4570";

    cout << "[AD] Listening on port " << port << endl;
    xfw = std::unique_ptr<Xapp>( new Xapp( port, true ) );

    xfw->Add_msg_cb( TS_ANOMALY_ACK, ts_callback, NULL ); /*Register a callback function for msg type 30004*/

    std::thread ad_thread;
    ad_thread = std::thread(&ad_loop);

    xfw->Run( nthreads );

    ad_thread.join();

    return 0;
}