/**
 * SPDX-FileCopyrightText: 2024 David Redondo <kde@david-redondo.de>
 *
 * SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 */
#include "shareinputdevicesplugin.h"

#include "inputcapturesession.h"
#include "plugin_shareinputdevices_debug.h"

#include <core/daemon.h>
#include <core/device.h>

#include <KLocalizedString>
#include <KPluginFactory>

#include <QDBusConnection>
#include <QPointF>

#include <linux/input-event-codes.h>

using namespace Qt::StringLiterals;

#define PACKET_TYPE_MOUSEPAD_REQUEST u"kdeconnect.mousepad.request"_s
#define PACKET_TYPE_SHAREINPUTDEVICES u"kdeconnect.shareinputdevices"_s
#define PACKET_TYPE_SHAREINPUTDEVICES_REQUEST u"kdeconnect.shareinputdevices.request"_s

QMap<int, int> specialKeysMap = {
    // 0,              // Invalid
    {Qt::Key_Backspace, 1},
    {Qt::Key_Tab, 2},
    // XK_Linefeed,    // 3
    {Qt::Key_Left, 4},
    {Qt::Key_Up, 5},
    {Qt::Key_Right, 6},
    {Qt::Key_Down, 7},
    {Qt::Key_PageUp, 8},
    {Qt::Key_PageDown, 9},
    {Qt::Key_Home, 10},
    {Qt::Key_End, 11},
    {Qt::Key_Return, 12},
    {Qt::Key_Enter, 12},
    {Qt::Key_Delete, 13},
    {Qt::Key_Escape, 14},
    {Qt::Key_SysReq, 15},
    {Qt::Key_ScrollLock, 16},
    // 0,              // 17
    // 0,              // 18
    // 0,              // 19
    // 0,              // 20
    {Qt::Key_F1, 21},
    {Qt::Key_F2, 22},
    {Qt::Key_F3, 23},
    {Qt::Key_F4, 24},
    {Qt::Key_F5, 25},
    {Qt::Key_F6, 26},
    {Qt::Key_F7, 27},
    {Qt::Key_F8, 28},
    {Qt::Key_F9, 29},
    {Qt::Key_F10, 30},
    {Qt::Key_F11, 31},
    {Qt::Key_F12, 32},
};

K_PLUGIN_CLASS_WITH_JSON(ShareInputDevicesPlugin, "kdeconnect_shareinputdevices.json")

ShareInputDevicesPlugin::ShareInputDevicesPlugin(QObject *parent, const QVariantList &args)
    : KdeConnectPlugin(parent, args)
    , m_inputCaptureSession(new InputCaptureSession(this))
{
    connect(m_inputCaptureSession, &InputCaptureSession::started, this, [this](const QLine &barrier, const QPointF &delta) {
        m_activatedBarrier = barrier;
        NetworkPacket packet(PACKET_TYPE_SHAREINPUTDEVICES_REQUEST, {{u"startEdge"_s, configuredEdge()}, {u"deltax"_s, delta.x()}, {u"deltay"_s, delta.y()}});
        sendPacket(packet);
    });
    connect(m_inputCaptureSession, &InputCaptureSession::mouseMove, this, [this](double x, double y) {
        NetworkPacket packet(PACKET_TYPE_MOUSEPAD_REQUEST, {{u"dx"_s, x}, {u"dy"_s, y}});
        sendPacket(packet);
    });
    connect(m_inputCaptureSession, &InputCaptureSession::mouseButton, this, [this](int button, bool pressed) {
        NetworkPacket packet(PACKET_TYPE_MOUSEPAD_REQUEST);
        // mousepad only supports separate press and release for left click currently, so send event on release even though not entirely correct
        if (button == BTN_LEFT) {
            packet.set(pressed ? u"singlehold"_s : u"singlerelease"_s, true);
        } else if (button == BTN_RIGHT && pressed) {
            packet.set(u"rightclick"_s, true);
        } else if (button == BTN_MIDDLE) {
            packet.set(u"middleclick"_s, true);
        }
        sendPacket(packet);
    });
    connect(m_inputCaptureSession, &InputCaptureSession::scrollDelta, this, [this](double x, double y) {
        qDebug() << "scrollDelta" << x << y;
        // scrollDirection in kdeconnect is inverted compared to what we get here
        NetworkPacket packet(PACKET_TYPE_MOUSEPAD_REQUEST, {{u"scroll"_s, true}, {u"dx"_s, x}, {u"dy"_s, y}});
        sendPacket(packet);
    });
    connect(m_inputCaptureSession, &InputCaptureSession::scrollDiscrete, this, [this](int x, int y) {
        qDebug() << "scolldiscrete" << x << y;
        constexpr auto anglePer120Step = 15 / 120.0;
        NetworkPacket packet(PACKET_TYPE_MOUSEPAD_REQUEST, {{u"scroll"_s, true}, {u"dx"_s, x * anglePer120Step}, {u"dy"_s, -y * anglePer120Step}});
        sendPacket(packet);
    });
    connect(m_inputCaptureSession, &InputCaptureSession::key, this, [this](Qt::Key key, Qt::KeyboardModifiers modifiers, const QString &text) {
        qDebug() << "sending key" << text << modifiers << specialKeysMap.value(key);
        NetworkPacket packet(PACKET_TYPE_MOUSEPAD_REQUEST,
                             {
                                 {u"key"_s, text},
                                 {u"specialKey"_s, specialKeysMap.value(key)},
                                 {u"shift"_s, static_cast<bool>(modifiers & Qt::ShiftModifier)},
                                 {u"ctrl"_s, static_cast<bool>(modifiers & Qt::ControlModifier)},
                                 {u"alt"_s, static_cast<bool>(modifiers & Qt::AltModifier)},
                                 {u"super"_s, static_cast<bool>(modifiers & Qt::MetaModifier)},
                             });
        sendPacket(packet);
    });

    m_inputCaptureSession->setBarrierEdge(configuredEdge());
    connect(config(), &KdeConnectPluginConfig::configChanged, this, [this] {
        m_inputCaptureSession->setBarrierEdge(configuredEdge());
    });
}

Qt::Edge ShareInputDevicesPlugin::configuredEdge() const
{
    return static_cast<Qt::Edge>(config()->getInt(u"edge"_s, Qt::LeftEdge));
}

void ShareInputDevicesPlugin::receivePacket(const NetworkPacket &np)
{
    if (np.type() == PACKET_TYPE_SHAREINPUTDEVICES) {
        if (np.has(u"releaseDeltax"_s)) {
            const QPointF releaseDelta{np.get<double>(u"releaseDeltax"_s), np.get<double>(u"releaseDeltay"_s)};
            const QPointF releasePosition = m_activatedBarrier.p1() + releaseDelta;
            m_inputCaptureSession->release(releasePosition);
        }
    }
}

QString ShareInputDevicesPlugin::dbusPath() const
{
    return QLatin1String("/modules/kdeconnect/devices/%1/shareinputdevices").arg(device()->id());
}

#include "shareinputdevicesplugin.moc"