/*
    Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file

    This file is part of 0MQ.

    0MQ is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    0MQ is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "testutil.hpp"

const int MAX_SENDS = 10000;

enum TestType { BIND_FIRST, CONNECT_FIRST };

int test_defaults ()
{
    void *ctx = zmq_ctx_new ();
    assert (ctx);
    int rc;

    // Set up bind socket
    void *bind_socket = zmq_socket (ctx, ZMQ_PULL);
    assert (bind_socket);
    rc = zmq_bind (bind_socket, "inproc://a");
    assert (rc == 0);

    // Set up connect socket
    void *connect_socket = zmq_socket (ctx, ZMQ_PUSH);
    assert (connect_socket);
    rc = zmq_connect (connect_socket, "inproc://a");
    assert (rc == 0);

    // Send until we block
    int send_count = 0;
    while (send_count < MAX_SENDS && zmq_send (connect_socket, NULL, 0, ZMQ_DONTWAIT) == 0)
        ++send_count;

    // Now receive all sent messages
    int recv_count = 0;
    while (zmq_recv (bind_socket, NULL, 0, ZMQ_DONTWAIT) == 0)
        ++recv_count;

    assert (send_count == recv_count);

    // Clean up
    rc = zmq_close (connect_socket);
    assert (rc == 0);

    rc = zmq_close (bind_socket);
    assert (rc == 0);

    rc = zmq_ctx_term (ctx);
    assert (rc == 0);

    return send_count;
}

int count_msg (int send_hwm, int recv_hwm, TestType testType)
{
    void *ctx = zmq_ctx_new ();
    assert (ctx);
    int rc;

    void *bind_socket;
    void *connect_socket;
    if (testType == BIND_FIRST)
    {
        // Set up bind socket
        bind_socket = zmq_socket (ctx, ZMQ_PULL);
        assert (bind_socket);
        rc = zmq_setsockopt (bind_socket, ZMQ_RCVHWM, &recv_hwm, sizeof (recv_hwm));
        assert (rc == 0);
        rc = zmq_bind (bind_socket, "inproc://a");
        assert (rc == 0);

        // Set up connect socket
        connect_socket = zmq_socket (ctx, ZMQ_PUSH);
        assert (connect_socket);
        rc = zmq_setsockopt (connect_socket, ZMQ_SNDHWM, &send_hwm, sizeof (send_hwm));
        assert (rc == 0);
        rc = zmq_connect (connect_socket, "inproc://a");
        assert (rc == 0);
    }
    else
    {
        // Set up connect socket
        connect_socket = zmq_socket (ctx, ZMQ_PUSH);
        assert (connect_socket);
        rc = zmq_setsockopt (connect_socket, ZMQ_SNDHWM, &send_hwm, sizeof (send_hwm));
        assert (rc == 0);
        rc = zmq_connect (connect_socket, "inproc://a");
        assert (rc == 0);

        // Set up bind socket
        bind_socket = zmq_socket (ctx, ZMQ_PULL);
        assert (bind_socket);
        rc = zmq_setsockopt (bind_socket, ZMQ_RCVHWM, &recv_hwm, sizeof (recv_hwm));
        assert (rc == 0);
        rc = zmq_bind (bind_socket, "inproc://a");
        assert (rc == 0);
    }

    // Send until we block
    int send_count = 0;
    while (send_count < MAX_SENDS && zmq_send (connect_socket, NULL, 0, ZMQ_DONTWAIT) == 0)
        ++send_count;

    // Now receive all sent messages
    int recv_count = 0;
    while (zmq_recv (bind_socket, NULL, 0, ZMQ_DONTWAIT) == 0)
        ++recv_count;

    assert (send_count == recv_count);

    // Now it should be possible to send one more.
    rc = zmq_send (connect_socket, NULL, 0, 0);
    assert (rc == 0);

    //  Consume the remaining message.
    rc = zmq_recv (bind_socket, NULL, 0, 0);
    assert (rc == 0);

    // Clean up
    rc = zmq_close (connect_socket);
    assert (rc == 0);

    rc = zmq_close (bind_socket);
    assert (rc == 0);

    rc = zmq_ctx_term (ctx);
    assert (rc == 0);

    return send_count;
}

int test_inproc_bind_first (int send_hwm, int recv_hwm)
{
    return count_msg(send_hwm, recv_hwm, BIND_FIRST);
}

int test_inproc_connect_first (int send_hwm, int recv_hwm)
{
    return count_msg(send_hwm, recv_hwm, CONNECT_FIRST);
}

int test_inproc_connect_and_close_first (int send_hwm, int recv_hwm)
{
    void *ctx = zmq_ctx_new ();
    assert (ctx);
    int rc;

    // Set up connect socket
    void *connect_socket = zmq_socket (ctx, ZMQ_PUSH);
    assert (connect_socket);
    rc = zmq_setsockopt (connect_socket, ZMQ_SNDHWM, &send_hwm, sizeof (send_hwm));
    assert (rc == 0);
    rc = zmq_connect (connect_socket, "inproc://a");
    assert (rc == 0);

    // Send until we block
    int send_count = 0;
    while (send_count < MAX_SENDS && zmq_send (connect_socket, NULL, 0, ZMQ_DONTWAIT) == 0)
        ++send_count;

    // Close connect
    rc = zmq_close (connect_socket);
    assert (rc == 0);

    // Set up bind socket
    void *bind_socket = zmq_socket (ctx, ZMQ_PULL);
    assert (bind_socket);
    rc = zmq_setsockopt (bind_socket, ZMQ_RCVHWM, &recv_hwm, sizeof (recv_hwm));
    assert (rc == 0);
    rc = zmq_bind (bind_socket, "inproc://a");
    assert (rc == 0);

    // Now receive all sent messages
    int recv_count = 0;
    while (zmq_recv (bind_socket, NULL, 0, ZMQ_DONTWAIT) == 0)
        ++recv_count;

    assert (send_count == recv_count);

    // Clean up
    rc = zmq_close (bind_socket);
    assert (rc == 0);

    rc = zmq_ctx_term (ctx);
    assert (rc == 0);

    return send_count;
}

int test_inproc_bind_and_close_first (int send_hwm, int recv_hwm)
{
    void *ctx = zmq_ctx_new ();
    assert (ctx);
    int rc;

    // Set up bind socket
    void *bind_socket = zmq_socket (ctx, ZMQ_PUSH);
    assert (bind_socket);
    rc = zmq_setsockopt (bind_socket, ZMQ_SNDHWM, &send_hwm, sizeof (send_hwm));
    assert (rc == 0);
    rc = zmq_bind (bind_socket, "inproc://a");
    assert (rc == 0);

    // Send until we block
    int send_count = 0;
    while (send_count < MAX_SENDS && zmq_send (bind_socket, NULL, 0, ZMQ_DONTWAIT) == 0)
        ++send_count;

    // Close bind
    rc = zmq_close (bind_socket);
    assert (rc == 0);

    /* Can't currently do connect without then wiring up a bind as things hang, this needs top be fixed.
    // Set up connect socket
    void *connect_socket = zmq_socket (ctx, ZMQ_PULL);
    assert (connect_socket);
    rc = zmq_setsockopt (connect_socket, ZMQ_RCVHWM, &recv_hwm, sizeof (recv_hwm));
    assert (rc == 0);
    rc = zmq_connect (connect_socket, "inproc://a");
    assert (rc == 0);

    // Now receive all sent messages
    int recv_count = 0;
    while (zmq_recv (connect_socket, NULL, 0, ZMQ_DONTWAIT) == 0)
        ++recv_count;

    assert (send_count == recv_count);
    */

    // Clean up
    //rc = zmq_close (connect_socket);
    //assert (rc == 0);

    rc = zmq_ctx_term (ctx);
    assert (rc == 0);

    return send_count;
}

int main (void)
{
    setup_test_environment();
    
    int count;

    // Default values are 1000 on send and 1000 one receive, so 2000 total
    count = test_defaults ();
    assert (count == 2000);

    // Infinite send and receive buffer
    count = test_inproc_bind_first (0, 0);
    assert (count == MAX_SENDS);
    count = test_inproc_connect_first (0, 0);
    assert (count == MAX_SENDS);

    // Infinite send buffer
    count = test_inproc_bind_first (1, 0);
    assert (count == MAX_SENDS);
    count = test_inproc_connect_first (1, 0);
    assert (count == MAX_SENDS);

    // Infinite receive buffer
    count = test_inproc_bind_first (0, 1);
    assert (count == MAX_SENDS);
    count = test_inproc_connect_first (0, 1);
    assert (count == MAX_SENDS);

    // Send and recv buffers hwm 1, so total that can be queued is 2
    count = test_inproc_bind_first (1, 1);
    assert (count == 2);
    count = test_inproc_connect_first (1, 1);
    assert (count == 2);

    // Send hwm of 1, send before bind so total that can be queued is 1
    count = test_inproc_connect_and_close_first (1, 0);
    assert (count == 1);

    // Send hwm of 1, send from bind side before connect so total that can be queued should be 1,
    // however currently all messages get thrown away before the connect.  BUG?
    count = test_inproc_bind_and_close_first (1, 0);
    //assert (count == 1);

    return 0;
}