%description:
Tests cGate::connectTo() and disconnect().

%file: test.ned

simple Sender
{
    gates:
        input in;
        output out;
}

simple Receiver
{
    gates:
        input in;
        output out;
}

network Test
{
    submodules:
        theSender : Sender;
        theReceiver : Receiver;
    connections:
        theSender.out --> theReceiver.in;
        theSender.in  <-- theReceiver.out;
}

%file: test.cc

#include <omnetpp.h>

using namespace omnetpp;

namespace @TESTNAME@ {

class Sender : public cSimpleModule
{
  public:
    Sender() : cSimpleModule(32768) { }
    cChannel *createChannel(double delay);
    virtual void activity() override;
};

Define_Module(Sender);

#define PRINT(g)   EV << #g << ":" << ((g) ? (g)->getFullName() : "nullptr") << endl

cChannel *Sender::createChannel(double delay)
{
    cDatarateChannel *ch = cDatarateChannel::create("chan");
    ch->setDelay(delay);
    return ch;
}

void Sender::activity()
{
   cGate *out = gate("out");
   cGate *rcvin = gate("out")->getNextGate();
   cChannel *ch;

   // start clean
   out->disconnect();

   // connect, then check if OK
   ch = createChannel(0.5);
   out->connectTo(rcvin, ch);
   PRINT(out->getChannel());

   // even send message to verify
   cMessage *msg = new cMessage("hello1");
   send(msg, "out");
   wait(1);

   // disconnect, then check if OK
   out->disconnect();
   PRINT(out->getChannel());

   // set channel, then reconnect
   ch = createChannel(0.25);
   out->connectTo(rcvin, ch);
   PRINT(out->getChannel());

   // send to verify
   cMessage *msg2 = new cMessage("hello2");
   send(msg2, "out");
   wait(1);

   // change channel
   ch = createChannel(0.125);
   out->reconnectWith(ch);

   // send to verify
   cMessage *msg3 = new cMessage("hello3");
   send(msg3, "out");
   wait(1);

   // remove channel
   out->reconnectWith(nullptr);
   PRINT(out->getChannel());

   EV << "done\n";
}

class Receiver : public cSimpleModule
{
  public:
    Receiver() : cSimpleModule(32768) { }
    virtual void activity() override;
};

Define_Module(Receiver);

void Receiver::activity()
{
    while (true)
    {
        cMessage *msg = receive();
        EV << msg->getName() << " arrived at " << simTime() << endl;
        delete msg;
    }
}

}; //namespace

%contains-regex: stdout
out->getChannel\(\):chan
.*
hello1 arrived at 0.5
.*
out->getChannel\(\):nullptr
.*
out->getChannel\(\):chan
.*
hello2 arrived at 1.25
.*
hello3 arrived at 2.125
.*
out->getChannel\(\):nullptr
done