#include "command.h"

#include <QProcess>
#include <QDebug>
#include <QDir>
#include <QRegularExpression>
#include <QDateTime>

Command::Command(QString const &command, int start_timeout, int finish_timeout)
    : m_command(command.trimmed())
    , m_commandResult("")
    , m_waitForStartTimeout(start_timeout)
    , m_waitForFinishTimeout(finish_timeout)
    , m_exitCode(-1) {
}

QString Command::getCommandResult() const {
    return m_commandResult;
}

void Command::readyReadStandardOutput() {
    QProcess *p = (QProcess *)sender();
    m_commandResult += p->readAllStandardOutput();
    // qCritical() << m_commandResult;
}

void Command::readyReadStandardError() {
    QProcess *p = (QProcess *)sender();
    QByteArray buf = p->readAllStandardError();
    qCritical() << buf;
}

void Command::finished(int /*exitCode*/, QProcess::ExitStatus /*exitStatus*/) {
    QProcess *p = (QProcess *)sender();
    // read all remaining data sent to the process, just in case
    QString d = p->readAllStandardOutput();
    if (!d.isEmpty()) {
        m_commandResult += d;
    }
    disconnect(p, SIGNAL(finished(int,QProcess::ExitStatus)), this, SLOT(readyReadStandardOutput()));
    disconnect(p, SIGNAL(finished(int,QProcess::ExitStatus)), this, SLOT(readyReadStandardError()));
}

bool Command::execute(QString workingDirectory, QStringList args) {

    if (!QDir::setCurrent(workingDirectory)) {
        qCritical() << "SET WORKING_DIRECTORY" << workingDirectory
                    << "FAILED FOR" << m_command;
        return false;
    }

    QScopedPointer<QProcess> p(new QProcess(this));
    p->setWorkingDirectory(workingDirectory);
    p->setProcessChannelMode(QProcess::MergedChannels);

    connect(&(*p), SIGNAL(readyReadStandardOutput()), this, SLOT(readyReadStandardOutput()));
    connect(&(*p), SIGNAL(readyReadStandardError()), this, SLOT(readyReadStandardError()));

    if (!args.isEmpty()) {
        //qDebug() << "START COMMAND" << m_command << "WITH ARGS" << args
        //         << "IN" << p->workingDirectory();
        p->start(m_command, args);
    } else {
        //qDebug() << "START COMMAND" << m_command
        //         << "IN" << p->workingDirectory();
        p->start(m_command);
    }

    qint64 const start = QDateTime::currentDateTime().toMSecsSinceEpoch();

    if (p->waitForStarted(m_waitForStartTimeout)) {
        // qDebug() << "PROCESS" << m_command << "STARTED IN" << p->workingDirectory();
        if (p->state() == QProcess::ProcessState::Running) {
            // qDebug() << "PROCESS" << m_command << "RUNNING IN" << p->workingDirectory();
            // wait forever for git/opkg-commands to finish
            int wait = m_waitForFinishTimeout;
            if (m_command.trimmed().startsWith("git", Qt::CaseInsensitive) ||
                m_command.trimmed().startsWith("opkg", Qt::CaseInsensitive)) {
                wait = -1;
            }
            bool const no_timeout = p->waitForFinished(wait);
            if (no_timeout) {
                // qDebug() << "PROCESS" << m_command << "FINISHED IN" << p->workingDirectory();
                if (p->exitStatus() == QProcess::NormalExit) {
                    if ((m_exitCode = p->exitCode()) == 0) {
                        qint64 const end = QDateTime::currentDateTime().toMSecsSinceEpoch();
                        qDebug() << "EXECUTED" << m_command
                                 << QString("(runtime %1ms)").arg(end-start)
                                 << "with code" << m_exitCode
                                 << "IN" << p->workingDirectory();
                        return true;
                    } else {
                        qint64 const end = QDateTime::currentDateTime().toMSecsSinceEpoch();
                        qCritical() << "EXECUTED" << m_command
                                    << QString("(runtime %1ms)").arg(end-start)
                                    << "with code" << m_exitCode
                                    << "IN" << p->workingDirectory();
                    }
                } else {
                    qint64 const end = QDateTime::currentDateTime().toMSecsSinceEpoch();
                    qCritical() << "PROCESS" << m_command << "CRASHED with code"
                                << p->exitCode()
                                << QString("(after %1ms)").arg(end-start)
                                << "IN" << p->workingDirectory();
                }
            } else {
                qint64 const end = QDateTime::currentDateTime().toMSecsSinceEpoch();
                qCritical() << "PROCESS" << m_command
                            << "DID NOT FINISH WITH" << wait
                            << "MS IN" << p->workingDirectory()
                            << QString("(runtime %1ms)").arg(end-start);
            }
        } else {
            qCritical() << "WRONG PROCESS STATE" << p->state()
                        << "IN" << p->workingDirectory();
        }
    } else {
        qint64 const end = QDateTime::currentDateTime().toMSecsSinceEpoch();
        qCritical() << "PROCESS" << m_command << "TIMEOUT AT START"
                    << QString("(runtime %1ms)").arg(end-start)
                    << "IN" << p->workingDirectory();
    }
    return false;
}