/**
 * @file DXLabSuiteCommanderTransceiver.cpp
 * @brief Implementation of the DXLabSuiteCommanderTransceiver class
 */

#include "DXLabSuiteCommanderTransceiver.h"
#include "JS8_Main/DriftingDateTime.h"
#include "JS8_Network/NetworkServerLookup.h"

#include <QDateTime>
#include <QLocale>
#include <QLoggingCategory>
#include <QRegularExpression>
#include <QTcpSocket>
#include <QThread>

#include "moc_DXLabSuiteCommanderTransceiver.cpp"

Q_DECLARE_LOGGING_CATEGORY(dxlabsuitecommandertransceiver_js8)

namespace {
char const *const commander_transceiver_name{"DX Lab Suite Commander"};

QString map_mode(Transceiver::MODE mode) {
    switch (mode) {
    case Transceiver::AM:
        return "AM";
    case Transceiver::CW:
        return "CW";
    case Transceiver::CW_R:
        return "CW-R";
    case Transceiver::USB:
        return "USB";
    case Transceiver::LSB:
        return "LSB";
    case Transceiver::FSK:
        return "RTTY";
    case Transceiver::FSK_R:
        return "RTTY-R";
    case Transceiver::DIG_L:
        return "DATA-L";
    case Transceiver::DIG_U:
        return "DATA-U";
    case Transceiver::FM:
    case Transceiver::DIG_FM:
        return "FM";
    default:
        break;
    }
    return "USB";
}
} // namespace

void DXLabSuiteCommanderTransceiver::register_transceivers(
    TransceiverFactory::Transceivers *registry, int id) {
    (*registry)[commander_transceiver_name] = TransceiverFactory::Capabilities{
        id, TransceiverFactory::Capabilities::network, true};
}

DXLabSuiteCommanderTransceiver::DXLabSuiteCommanderTransceiver(
    std::unique_ptr<TransceiverBase> wrapped, QString const &address,
    bool use_for_ptt, int poll_interval, QObject *parent)
    : PollingTransceiver{poll_interval, parent}, wrapped_{std::move(wrapped)},
      use_for_ptt_{use_for_ptt}, server_{address}, commander_{nullptr} {}

int DXLabSuiteCommanderTransceiver::do_start() {
    TRACE_CAT("DXLabSuiteCommanderTransceiver", "starting");
    if (wrapped_)
        wrapped_->start(0);

    auto server_details =
        network_server_lookup(server_, 52002u, QHostAddress::LocalHost,
                              QAbstractSocket::IPv4Protocol);

    if (!commander_) {
        commander_ = new QTcpSocket{this}; // QObject takes ownership
    }

    commander_->connectToHost(std::get<0>(server_details),
                              std::get<1>(server_details));
    if (!commander_->waitForConnected()) {
        TRACE_CAT("DXLabSuiteCommanderTransceiver",
                  "failed to connect" << commander_->errorString());
        throw error{tr("Failed to connect to DX Lab Suite Commander\n") +
                    commander_->errorString()};
    }

    // sleeps here are to ensure Commander has actually queried the rig
    // rather than returning cached data which maybe stale or simply
    // read backs of not yet committed values, the 2s delays are
    // arbitrary but hopefully enough as the actual time required is rig
    // and Commander setting dependent
    int resolution{0};
    QThread::msleep(2000);
    auto reply = command_with_reply("<command:10>CmdGetFreq<parameters:0>");
    if (0 == reply.indexOf("<CmdFreq:")) {
        auto f = string_to_frequency(reply.mid(reply.indexOf('>') + 1));
        if (f && !(f % 10)) {
            auto test_frequency = f - f % 100 + 55;
            auto f_string = frequency_to_string(test_frequency);
            auto params = ("<xcvrfreq:%1>" + f_string).arg(f_string.size());
            simple_command(("<command:10>CmdSetFreq<parameters:%1>" + params)
                               .arg(params.size()));
            QThread::msleep(2000);
            reply = command_with_reply("<command:10>CmdGetFreq<parameters:0>");
            if (0 == reply.indexOf("<CmdFreq:")) {
                auto new_frequency =
                    string_to_frequency(reply.mid(reply.indexOf('>') + 1));
                switch (static_cast<Radio::FrequencyDelta>(new_frequency -
                                                           test_frequency)) {
                case -5:
                    resolution = -1;
                    break; // 10Hz truncated
                case 5:
                    resolution = 1;
                    break; // 10Hz rounded
                case -15:
                    resolution = -2;
                    break; // 20Hz truncated
                case -55:
                    resolution = -2;
                    break; // 100Hz truncated
                case 45:
                    resolution = 2;
                    break; // 100Hz rounded
                }
                if (1 == resolution) // may be 20Hz rounded
                {
                    test_frequency = f - f % 100 + 51;
                    f_string = frequency_to_string(test_frequency);
                    params = ("<xcvrfreq:%1>" + f_string).arg(f_string.size());
                    simple_command(
                        ("<command:10>CmdSetFreq<parameters:%1>" + params)
                            .arg(params.size()));
                    QThread::msleep(2000);
                    reply = command_with_reply(
                        "<command:10>CmdGetFreq<parameters:0>");
                    new_frequency =
                        string_to_frequency(reply.mid(reply.indexOf('>') + 1));
                    if (9 == static_cast<Radio::FrequencyDelta>(
                                 new_frequency - test_frequency)) {
                        resolution = 2; // 20Hz rounded
                    }
                }
                f_string = frequency_to_string(f);
                params = ("<xcvrfreq:%1>" + f_string).arg(f_string.size());
                simple_command(
                    ("<command:10>CmdSetFreq<parameters:%1>" + params)
                        .arg(params.size()));
            }
        }
    } else {
        TRACE_CAT("DXLabSuiteCommanderTransceiver",
                  "get frequency unexpected response" << reply);
        throw error{tr("DX Lab Suite Commander didn't respond correctly "
                       "reading frequency: ") +
                    reply};
    }

    poll();
    return resolution;
}

void DXLabSuiteCommanderTransceiver::do_stop() {
    if (commander_) {
        commander_->close();
        delete commander_, commander_ = nullptr;
    }

    if (wrapped_)
        wrapped_->stop();
    TRACE_CAT("DXLabSuiteCommanderTransceiver", "stopped");
}

void DXLabSuiteCommanderTransceiver::do_ptt(bool on) {
    TRACE_CAT("DXLabSuiteCommanderTransceiver", on << state());
    if (use_for_ptt_) {
        simple_command(on ? "<command:5>CmdTX<parameters:0>"
                          : "<command:5>CmdRX<parameters:0>");

        bool tx{!on};
        auto start = DriftingDateTime::currentMSecsSinceEpoch();
        // we must now wait for Tx on the rig, we will wait a short while
        // before bailing out
        while (tx != on &&
               DriftingDateTime::currentMSecsSinceEpoch() - start < 1000) {
            auto reply =
                command_with_reply("<command:9>CmdSendTx<parameters:0>");
            if (0 == reply.indexOf("<CmdTX:")) {
                auto state = reply.mid(reply.indexOf('>') + 1);
                if ("ON" == state) {
                    tx = true;
                } else if ("OFF" == state) {
                    tx = false;
                } else {
                    TRACE_CAT("DXLabSuiteCommanderTransceiver",
                              "unexpected TX state" << state);
                    throw error{tr("DX Lab Suite Commander sent an "
                                   "unrecognised TX state: ") +
                                state};
                }
            } else {
                TRACE_CAT("DXLabSuiteCommanderTransceiver",
                          "get TX unexpected response" << reply);
                throw error{tr("DX Lab Suite Commander didn't respond "
                               "correctly polling TX status: ") +
                            reply};
            }
            if (tx != on)
                QThread::msleep(10); // don't thrash Commander
        }
        update_PTT(tx);
        if (tx != on) {
            TRACE_CAT("DXLabSuiteCommanderTransceiver",
                      "rig failed to respond to PTT: " << on);
            throw error{
                tr("DX Lab Suite Commander rig did not respond to PTT: ") +
                (on ? "ON" : "OFF")};
        }
    } else {
        Q_ASSERT(wrapped_);
        TransceiverState new_state{wrapped_->state()};
        new_state.ptt(on);
        wrapped_->set(new_state, 0);
        update_PTT(on);
    }
}

void DXLabSuiteCommanderTransceiver::do_frequency(Frequency f, MODE m,
                                                  bool /*no_ignore*/) {
    TRACE_CAT("DXLabSuiteCommanderTransceiver", f << state());
    auto f_string = frequency_to_string(f);
    if (UNK != m && m != get_mode()) {
        auto m_string = map_mode(m);
        auto params = ("<xcvrfreq:%1>" + f_string + "<xcvrmode:%2>" + m_string +
                       "<preservesplitanddual:1>Y")
                          .arg(f_string.size())
                          .arg(m_string.size());
        simple_command(("<command:14>CmdSetFreqMode<parameters:%1>" + params)
                           .arg(params.size()));
        update_mode(m);
    } else {
        auto params = ("<xcvrfreq:%1>" + f_string).arg(f_string.size());
        simple_command(("<command:10>CmdSetFreq<parameters:%1>" + params)
                           .arg(params.size()));
    }
    update_rx_frequency(f);
}

void DXLabSuiteCommanderTransceiver::do_tx_frequency(Frequency tx, MODE mode,
                                                     bool /*no_ignore*/) {
    TRACE_CAT("DXLabSuiteCommanderTransceiver", tx << state());
    if (tx) {
        auto f_string = frequency_to_string(tx);
        auto params = ("<xcvrfreq:%1>" + f_string + "<SuppressDual:1>Y")
                          .arg(f_string.size());
        if (UNK == mode) {
            params += "<SuppressModeChange:1>Y";
        }
        simple_command(("<command:11>CmdQSXSplit<parameters:%1>" + params)
                           .arg(params.size()));
    } else {
        simple_command("<command:8>CmdSplit<parameters:8><1:3>off");
    }
    update_split(tx);
    update_other_frequency(tx);
}

void DXLabSuiteCommanderTransceiver::do_mode(MODE m) {
    TRACE_CAT("DXLabSuiteCommanderTransceiver", m << state());
    auto m_string = map_mode(m);
    auto params = ("<1:%1>" + m_string).arg(m_string.size());
    simple_command(
        ("<command:10>CmdSetMode<parameters:%1>" + params).arg(params.size()));
    update_mode(m);
}

void DXLabSuiteCommanderTransceiver::poll() {
    bool quiet{!transceiverbase_js8().isDebugEnabled()};

    auto reply =
        command_with_reply("<command:10>CmdGetFreq<parameters:0>", quiet);
    if (0 == reply.indexOf("<CmdFreq:")) {
        auto f = string_to_frequency(reply.mid(reply.indexOf('>') + 1));
        if (f) {
            if (!state().ptt()) // Commander is not reliable on frequency
                                // polls while transmitting
            {
                update_rx_frequency(f);
            }
        }
    } else {
        TRACE_CAT_POLL("DXLabSuiteCommanderTransceiver",
                       "get frequency unexpected response" << reply);
        throw error{tr("DX Lab Suite Commander didn't respond correctly "
                       "polling frequency: ") +
                    reply};
    }

    if (state().split()) {
        reply =
            command_with_reply("<command:12>CmdGetTXFreq<parameters:0>", quiet);
        if (0 == reply.indexOf("<CmdTXFreq:")) {
            auto f = string_to_frequency(reply.mid(reply.indexOf('>') + 1));
            if (f) {
                if (!state().ptt()) // Commander is not reliable on frequency
                                    // polls while transmitting
                {
                    update_other_frequency(f);
                }
            }
        } else {
            TRACE_CAT_POLL("DXLabSuiteCommanderTransceiver",
                           "get tx frequency unexpected response" << reply);
            throw error{tr("DX Lab Suite Commander didn't respond correctly "
                           "polling TX frequency: ") +
                        reply};
        }
    }

    reply = command_with_reply("<command:12>CmdSendSplit<parameters:0>", quiet);
    if (0 == reply.indexOf("<CmdSplit:")) {
        auto split = reply.mid(reply.indexOf('>') + 1);
        if ("ON" == split) {
            update_split(true);
        } else if ("OFF" == split) {
            update_split(false);
        } else {
            TRACE_CAT_POLL("DXLabSuiteCommanderTransceiver",
                           "unexpected split state" << split);
            throw error{tr("DX Lab Suite Commander sent an unrecognised split "
                           "state: ") +
                        split};
        }
    } else {
        TRACE_CAT_POLL("DXLabSuiteCommanderTransceiver",
                       "get split mode unexpected response" << reply);
        throw error{tr("DX Lab Suite Commander didn't respond correctly "
                       "polling split status: ") +
                    reply};
    }

    get_mode(quiet);
}

auto DXLabSuiteCommanderTransceiver::get_mode(bool no_debug) -> MODE {
    MODE m{UNK};
    auto reply =
        command_with_reply("<command:11>CmdSendMode<parameters:0>", no_debug);
    if (0 == reply.indexOf("<CmdMode:")) {
        auto mode = reply.mid(reply.indexOf('>') + 1);
        if ("AM" == mode) {
            m = AM;
        } else if ("CW" == mode) {
            m = CW;
        } else if ("CW-R" == mode) {
            m = CW_R;
        } else if ("FM" == mode || "WBFM" == mode) {
            m = FM;
        } else if ("LSB" == mode) {
            m = LSB;
        } else if ("USB" == mode) {
            m = USB;
        } else if ("RTTY" == mode) {
            m = FSK;
        } else if ("RTTY-R" == mode) {
            m = FSK_R;
        } else if ("PKT" == mode || "DATA-L" == mode || "Data-L" == mode ||
                   "DIGL" == mode) {
            m = DIG_L;
        } else if ("PKT-R" == mode || "DATA-U" == mode || "Data-U" == mode ||
                   "DIGU" == mode) {
            m = DIG_U;
        } else {
            TRACE_CAT_POLL("DXLabSuiteCommanderTransceiver",
                           "unexpected mode name" << mode);
            throw error{
                tr("DX Lab Suite Commander sent an unrecognised mode: \"") +
                mode + '"'};
        }
        update_mode(m);
    } else {
        TRACE_CAT_POLL("DXLabSuiteCommanderTransceiver",
                       "unexpected response" << reply);
        throw error{tr("DX Lab Suite Commander didn't respond correctly "
                       "polling mode: ") +
                    reply};
    }
    return m;
}

void DXLabSuiteCommanderTransceiver::simple_command(QString const &cmd,
                                                    bool no_debug) {
    Q_ASSERT(commander_);

    if (!no_debug) {
        TRACE_CAT("DXLabSuiteCommanderTransceiver", cmd);
    }

    if (!write_to_port(cmd)) {
        TRACE_CAT("DXLabSuiteCommanderTransceiver",
                  "failed:" << commander_->errorString());
        throw error{tr("DX Lab Suite Commander send command failed\n") +
                    commander_->errorString()};
    }
}

QString DXLabSuiteCommanderTransceiver::command_with_reply(QString const &cmd,
                                                           bool no_debug) {
    Q_ASSERT(commander_);

    if (!write_to_port(cmd)) {
        TRACE_CAT("DXLabSuiteCommanderTransceiver",
                  "failed to send command:" << commander_->errorString());
        throw error{
            tr("DX Lab Suite Commander failed to send command \"%1\": %2\n")
                .arg(cmd)
                .arg(commander_->errorString())};
    }

    // waitForReadReady appears to be unreliable on Windows timing out
    // when data is waiting so retry a few times
    unsigned retries{5};
    bool replied{false};
    while (!replied && --retries) {
        replied = commander_->waitForReadyRead();
        if (!replied && commander_->error() != commander_->SocketTimeoutError) {
            TRACE_CAT("DXLabSuiteCommanderTransceiver",
                      cmd << "failed to read reply:"
                          << commander_->errorString());
            throw error{tr("DX Lab Suite Commander send command \"%1\" read "
                           "reply failed: %2\n")
                            .arg(cmd)
                            .arg(commander_->errorString())};
        }
    }

    if (!replied) {
        TRACE_CAT("DXLabSuiteCommanderTransceiver", cmd << "retries exhausted");
        throw error{tr("DX Lab Suite Commander retries exhausted sending "
                       "command \"%1\"")
                        .arg(cmd)};
    }

    auto result = commander_->readAll();
    // qCDebug (dxlabsuitecommandertransceiver_js8) << "result: " << result;
    // for (int i = 0; i < result.size (); ++i)
    //   {
    //     qCDebug (dxlabsuitecommandertransceiver_js8) << i << ":" << hex <<
    //     int (result[i]);
    //   }

    if (!no_debug) {
        TRACE_CAT("DXLabSuiteCommanderTransceiver", cmd << "->" << result);
    }

    return result; // converting raw UTF-8 bytes to QString
}

bool DXLabSuiteCommanderTransceiver::write_to_port(QString const &s) {
    auto data = s.toLocal8Bit();
    auto to_send = data.constData();
    auto length = data.size();

    qint64 total_bytes_sent{0};
    while (total_bytes_sent < length) {
        auto bytes_sent = commander_->write(to_send + total_bytes_sent,
                                            length - total_bytes_sent);
        if (bytes_sent < 0 || !commander_->waitForBytesWritten()) {
            return false;
        }

        total_bytes_sent += bytes_sent;
    }
    return true;
}

QString DXLabSuiteCommanderTransceiver::frequency_to_string(Frequency f) const {
    // number is localized and in kHz, avoid floating point translation
    // errors by adding a small number (0.1Hz)
    return QString{"%L1"}.arg(f / 1e3 + 1e-4, 10, 'f', 3);
}

auto DXLabSuiteCommanderTransceiver::string_to_frequency(QString s) const
    -> Frequency {
    // temporary hack because Commander is returning invalid UTF-8 bytes
    s.replace(QChar{QChar::ReplacementCharacter}, locale_.groupSeparator());

    // remove DP - relies on n.nnn kHz format so we can do ulonglong
    // conversion to Hz
    bool ok;

    // auto f = locale_.toDouble (s, &ok); // use when CmdSendFreq and
    // CmdSendTxFreq reinstated

    auto f = QLocale::c().toDouble(s, &ok); // temporary fix

    if (!ok) {
        throw error{
            tr("DX Lab Suite Commander sent an unrecognized frequency")};
    }
    return (f + 1e-4) * 1e3;
}

Q_LOGGING_CATEGORY(dxlabsuitecommandertransceiver_js8,
                   "dxlabsuitecommandertransceiver.js8", QtWarningMsg)