//// @file
/// @brief QS/C++ QUTEST port for POSIX
/// @ingroup qf
/// @cond
///***************************************************************************
/// Last updated for version 6.2.0
/// Last updated on  2018-03-16
///
///                    Q u a n t u m     L e a P s
///                    ---------------------------
///                    innovating embedded systems
///
/// Copyright (C) 2005-2018 Quantum Leaps, LLC. All rights reserved.
///
/// This program is open source software: you can redistribute it and/or
/// modify it under the terms of the GNU General Public License as published
/// by the Free Software Foundation, either version 3 of the License, or
/// (at your option) any later version.
///
/// Alternatively, this program may be distributed and modified under the
/// terms of Quantum Leaps commercial licenses, which expressly supersede
/// the GNU General Public License and are specifically designed for
/// licensees interested in retaining the proprietary status of their code.
///
/// This program 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 General Public License for more details.
///
/// You should have received a copy of the GNU General Public License
/// along with this program. If not, see <http://www.gnu.org/licenses/>.
///
/// Contact information:
/// https://www.state-machine.com
/// mailto:info@state-machine.com
///***************************************************************************
/// @endcond
///

#ifndef Q_SPY
    #error "Q_SPY must be defined for QTEST application"
#endif // Q_SPY

#define QP_IMPL       // this is QP implementation
#include "qf_port.h"  // QF port
#include "qassert.h"  // QP embedded systems-friendly assertions
#include "qs_port.h"  // include QS port

#include <stdio.h>    // for printf() and _snprintf_s()
#include <stdlib.h>
#include <string.h>
#include <sys/select.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <errno.h>
#include <time.h>
#include <unistd.h>
#include <signal.h>

#define QS_TX_SIZE     (4*1024)
#define QS_RX_SIZE     1024
#define QS_IMEOUT_MS   100
#define INVALID_SOCKET -1

namespace QP {

Q_DEFINE_THIS_MODULE("qutest_port")

// local variables ...........................................................
static void sigIntHandler(int dummy);
static int l_sock = INVALID_SOCKET;

//............................................................................
bool QS::onStartup(void const *arg) {
    static uint8_t qsBuf[QS_TX_SIZE];   // buffer for QS-TX channel
    static uint8_t qsRxBuf[QS_RX_SIZE]; // buffer for QS-RX channel
    char hostName[128];
    char const *src;
    char *dst;

    uint16_t port_local  = 51234; /* default local port */
    uint16_t port_remote = 6601;  /* default QSPY server port */
    int sockopt_bool;
    struct sockaddr_in sa_local;
    struct sockaddr_in sa_remote;
    struct hostent *host;

    struct sigaction sig_act;

    initBuf(qsBuf, sizeof(qsBuf));
    rxInitBuf(qsRxBuf, sizeof(qsRxBuf));

    src = (arg != (void const *)0)
          ? (char const *)arg
          : "localhost";
    dst = hostName;
    while ((*src != '\0')
           && (*src != ':')
           && (dst < &hostName[sizeof(hostName)]))
    {
        *dst++ = *src++;
    }
    *dst = '\0';
    if (*src == ':') {
        port_remote = (uint16_t)strtoul(src + 1, NULL, 10);
    }

    //printf("<TARGET> Connecting to QSPY on Host=%s:%d...\n",
    //       hostName, port_remote);

    l_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); /* TCP socket */
    if (l_sock == INVALID_SOCKET){
        printf("<TARGET> ERROR   cannot create client socket,errno=%d\n",
               errno);
        goto error;
    }

    /* configure the socket */
    sockopt_bool = 1;
    setsockopt(l_sock, SOL_SOCKET, SO_REUSEADDR,
               &sockopt_bool, sizeof(sockopt_bool));

    sockopt_bool = 0;
    setsockopt(l_sock, SOL_SOCKET, SO_LINGER,
               &sockopt_bool, sizeof(sockopt_bool));

    /* local address:port */
    memset(&sa_local, 0, sizeof(sa_local));
    sa_local.sin_family = AF_INET;
    sa_local.sin_port = htons(port_local);
    host = gethostbyname(""); /* local host */

    /* remote hostName:port (QSPY server socket) */
    host = gethostbyname(hostName);
    if (host == NULL) {
        printf("<TARGET> ERROR   cannot resolve host Name=%s,errno=%d\n",
               hostName, errno);
        goto error;
    }

    memset(&sa_remote, 0, sizeof(sa_remote));
    sa_remote.sin_family = AF_INET;
    memcpy(&sa_remote.sin_addr, host->h_addr, host->h_length);
    sa_remote.sin_port = htons(port_remote);

    /* try to connect to the QSPY server */
    if (connect(l_sock, (struct sockaddr *)&sa_remote, sizeof(sa_remote))
        == -1)
    {
        printf("<TARGET> ERROR   cannot connect to QSPY at "
               "Host=%s:%d,errno=%d\n",
               hostName, port_remote, errno);
        goto error;
    }

    //printf("<TARGET> Connected to QSPY at Host=%s:%d\n",
    //       hostName, port_remote);
    onFlush();

    // install the SIGINT (Ctrl-C) signal handler
    sig_act.sa_handler = &sigIntHandler;
    sigaction(SIGINT, &sig_act, NULL);

    return true;  // success

error:
    return false; // failure
}
//............................................................................
void QS::onCleanup(void) {
    if (l_sock != INVALID_SOCKET) {
        close(l_sock);
        l_sock = INVALID_SOCKET;
    }
    //printf("<TARGET> Disconnected from QSPY\n");
}
//............................................................................
void QS::onReset(void) {
    onCleanup();
    exit(0);
}

//............................................................................
void QS::onTestLoop() {
    fd_set readSet;
    FD_ZERO(&readSet);

    rxPriv_.inTestLoop = true;
    while (rxPriv_.inTestLoop) {
        static struct timeval timeout = {
            (long)0, (long)(QS_IMEOUT_MS * 1000)
        };
        int nrec;
        uint16_t nBytes;
        uint8_t const *block;

        FD_SET(l_sock, &readSet);   /* the socket */

        /* selective, timed blocking on the TCP/IP socket... */
        timeout.tv_usec = (long)(QS_IMEOUT_MS * 1000);
        nrec = select(l_sock + 1, &readSet,
                      (fd_set *)0, (fd_set *)0, &timeout);
        if (nrec < 0) {
            printf("<TARGET> ERROR socket select,errno=%d\n", errno);
            onCleanup();
            exit(-2);
        }
        else if (nrec > 0) {
            if (FD_ISSET(l_sock, &readSet)) { /* socket ready to read? */
                uint8_t buf[QS_RX_SIZE];
                int status = recv(l_sock, (char *)buf, (int)sizeof(buf), 0);
                while (status > 0) { /* any data received? */
                    uint8_t *pb;
                    int i = (int)rxGetNfree();
                    if (i > status) {
                        i = status;
                    }
                    status -= i;
                    /* reorder the received bytes into QS-RX buffer */
                    for (pb = &buf[0]; i > 0; --i, ++pb) {
                        rxPut(*pb);
                    }
                    rxParse(); // parse all n-bytes of data
                }
            }
        }

        nBytes = QS_TX_SIZE;
        //QF_CRIT_ENTRY(dummy);
        block = getBlock(&nBytes);
        //QF_CRIT_EXIT(dummy);

        if (block != (uint8_t *)0) {
            send(l_sock, (char const *)block, nBytes, 0);
        }
    }
    // set inTestLoop to true in case calls to QS_onTestLoop() nest,
    // which can happen through the calls to QS_TEST_PAUSE().
    rxPriv_.inTestLoop = true;
}
//............................................................................
void QS::onFlush(void) {
    if (l_sock != INVALID_SOCKET) {  // socket initialized?
        uint16_t nBytes = QS_TX_SIZE;
        uint8_t const *data;
        while ((data = getBlock(&nBytes)) != (uint8_t *)0) {
            send(l_sock, (char const *)data, nBytes, 0);
            nBytes = QS_TX_SIZE;
        }
    }
}

//............................................................................
static void sigIntHandler(int /* dummy */) {
    QS::onCleanup();
    printf("\n<TARGET> disconnecting from QSPY\n");
    exit(-1);
}

} // namespace QP