#include "application_instance.h"

#include <qdatetime.h>

#include <QCryptographicHash>
#include <QDateTime>
#include <QProcess>
#include <QTimer>
#include <QUuid>
#include <QtConcurrent/QtConcurrent>

#include "../../modules/applicationhelper/helper.h"
#include "application.h"
#include "applicationinstanceadaptor.h"

#ifdef DEFINE_LOADER_PATH
#include "../../src/define.h"
#endif

class ApplicationInstancePrivate {
    ApplicationInstance* q_ptr = nullptr;
    Q_DECLARE_PUBLIC(ApplicationInstance);

    Application*                                       application;
    ApplicationInstanceAdaptor*                        adapter;
    QString                                            m_path;
    QSharedPointer<modules::ApplicationHelper::Helper> helper;
    QDateTime                                          startupTime;
    QString                                            m_id;

public:
    ApplicationInstancePrivate(ApplicationInstance* parent) : q_ptr(parent)
    {
        startupTime = QDateTime::currentDateTime();
        m_id        = QString(QCryptographicHash::hash(QUuid::createUuid().toByteArray(), QCryptographicHash::Md5).toHex());
        m_path      = QString("/org/desktopspec/ApplicationInstance/%1").arg(m_id);
        adapter     = new ApplicationInstanceAdaptor(q_ptr);
    }

    ~ApplicationInstancePrivate()
    {
        // disconnect dbus
        QDBusConnection::sessionBus().unregisterObject(m_path);
    }

    void run()
    {
#ifdef DEFINE_LOADER_PATH
        const QString task_hash{ QString("DAM_TASK_HASH=%1").arg(m_id) };
        const QString task_type{ "DAM_TASK_TYPE=freedesktop " };
        QProcess*     p = new QProcess(q_ptr);
        p->connect(p, static_cast<void (QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished), p, [=] {
            qInfo().noquote() << p->readAllStandardOutput();
            qWarning().noquote() << p->readAllStandardError();
        });
        p->connect(p, static_cast<void (QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished), q_ptr, &ApplicationInstance::taskFinished);
        p->connect(p, &QProcess::readyReadStandardOutput, p, [=] { qInfo() << p->readAllStandardOutput(); });
        p->connect(p, &QProcess::readyReadStandardError, p, [=] { qWarning() << p->readAllStandardError(); });
        p->setProgram(LOADER_PATH);
        QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
        env.insert("DAM_TASK_HASH", m_id);
        env.insert("DAM_TASK_TYPE", "freedesktop");
        p->setEnvironment(env.toStringList());
        p->start();
        p->waitForStarted();
        if (p->state() == QProcess::ProcessState::NotRunning) {
            emit q_ptr->taskFinished(p->exitCode());
        }
#else
        QDBusInterface   systemd("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager");
        QDBusReply<void> reply = systemd.call("StartUnit", QString("org.deskspec.application.instance@%1.service").arg(m_id), "replace-irreversibly");
        if (!reply.isValid()) {
            qInfo() << reply.error();
            q_ptr->deleteLater();
        }
#endif
    }

    void _exit()
    {
#ifdef LOADER_PATH
#else
        QDBusInterface systemd("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager");
        qInfo() << systemd.call("StopUnit", QString("org.deskspec.application.instance@%1.service").arg(m_id), "replace-irreversibly");
#endif
    }

    void _kill() {}
};

ApplicationInstance::ApplicationInstance(Application* parent, QSharedPointer<modules::ApplicationHelper::Helper> helper) : QObject(nullptr), dd_ptr(new ApplicationInstancePrivate(this))
{
    Q_D(ApplicationInstance);

    d->application = parent;
    d->helper      = helper;

    QTimer::singleShot(0, this, [=] {
        QDBusConnection::sessionBus().registerObject(d->m_path, "org.desktopspec.ApplicationInstance", this);
        d->run();
    });
}

ApplicationInstance::~ApplicationInstance()
{
    Q_D(ApplicationInstance);
    qDebug() << "instance quit " << d->helper->desktop();
}

QDBusObjectPath ApplicationInstance::id() const
{
    Q_D(const ApplicationInstance);

    return d->application->path();
}

QString ApplicationInstance::hash() const
{
    Q_D(const ApplicationInstance);

    return d->m_id;
}

quint64 ApplicationInstance::startuptime() const
{
    Q_D(const ApplicationInstance);

    return d->startupTime.toSecsSinceEpoch();
}

QDBusObjectPath ApplicationInstance::path() const
{
    Q_D(const ApplicationInstance);

    return QDBusObjectPath(d->m_path);
}

Methods::Task ApplicationInstance::taskInfo() const
{
    Q_D(const ApplicationInstance);

    Methods::Task task;
    task.id    = d->m_id.toStdString();
    task.runId = d->application->id().toStdString();
    task.date  = QString::number(startuptime()).toStdString();

    // TODO: debug to display environment
    task.environments.insert({ "DISPLAY", ":0" });
    auto sysEnv = QProcessEnvironment::systemEnvironment();
    for (const auto& key : sysEnv.keys()) {
        task.environments.insert({ key.toStdString(), sysEnv.value(key).toStdString() });
    }

    return task;
}

void ApplicationInstance::Exit()
{
    Q_D(ApplicationInstance);

    return d->_exit();
}

void ApplicationInstance::Kill()
{
    Q_D(ApplicationInstance);

    return d->_kill();
}