// SPDX-License-Identifier: MIT

#include "taskbargeometry.h"

#include <QDBusConnection>
#include <QDBusInterface>
#include <QDBusReply>
#include <QDebug>

namespace {
constexpr auto scriptName = "se.ajpanton.task-group-shortcuts.geometry";
constexpr auto objectPath = "/TaskbarGeometry";
}

TaskbarGeometry::TaskbarGeometry(QObject *parent)
    : QObject(parent)
{
    auto bus = QDBusConnection::sessionBus();
    if (!bus.registerObject(QString::fromLatin1(objectPath), this, QDBusConnection::ExportScriptableContents)) {
        qFatal("Cannot register the taskbar geometry interface");
    }
    QDBusInterface scripting(QStringLiteral("org.kde.KWin"), QStringLiteral("/Scripting"),
                             QStringLiteral("org.kde.kwin.Scripting"));
    // Replace any copy left behind by an earlier process that was terminated.
    scripting.call(QStringLiteral("unloadScript"), QString::fromLatin1(scriptName));
    const QDBusReply<int> loaded = scripting.call(QStringLiteral("loadDeclarativeScript"),
        QStringLiteral(GEOMETRY_SCRIPT_PATH), QString::fromLatin1(scriptName));
    if (!loaded.isValid() || loaded.value() < 0) {
        qWarning() << "Cannot load taskbar geometry script:" << loaded.error().message();
        return;
    }
    m_loaded = true;
    QDBusInterface script(QStringLiteral("org.kde.KWin"),
        QStringLiteral("/Scripting/Script%1").arg(loaded.value()), QStringLiteral("org.kde.kwin.Script"));
    const QDBusReply<void> started = script.call(QStringLiteral("run"));
    if (!started.isValid()) {
        qWarning() << "Cannot start taskbar geometry script:" << started.error().message();
        m_loaded = false;
    }
}

TaskbarGeometry::~TaskbarGeometry()
{
    QDBusInterface scripting(QStringLiteral("org.kde.KWin"), QStringLiteral("/Scripting"),
                             QStringLiteral("org.kde.kwin.Scripting"));
    scripting.call(QStringLiteral("unloadScript"), QString::fromLatin1(scriptName));
    QDBusConnection::sessionBus().unregisterObject(QString::fromLatin1(objectPath));
}

void TaskbarGeometry::request(const QString &uuid)
{
    ++m_serial;
    m_uuid = uuid;
    if (m_ready) {
        Q_EMIT lookup(m_serial, uuid);
    } else if (!m_loaded) {
        Q_EMIT received({});
    }
}

void TaskbarGeometry::cancel()
{
    ++m_serial;
    m_uuid.clear();
}

void TaskbarGeometry::bridgeReady()
{
    m_ready = true;
    if (!m_uuid.isEmpty()) {
        Q_EMIT lookup(m_serial, m_uuid);
    }
}

void TaskbarGeometry::complete(int serial, double x, double y, double width, double height)
{
    if (serial == m_serial && !m_uuid.isEmpty()) {
        Q_EMIT received(QRectF(x, y, width, height));
    }
}