/*
 * Copyright (C) 2011~2017 by CSSlayer
 * wengxt@gmail.com
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above Copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above Copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the authors nor the names of its contributors
 *    may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 */

#include "fcitxinputcontextproxy.h"
#include "fcitxwatcher.h"
#include <QCoreApplication>
#include <QDBusConnectionInterface>
#include <QDBusInterface>
#include <QDBusMetaType>
#include <QFileInfo>
#include <QTimer>
#include <unistd.h>

FcitxInputContextProxy::FcitxInputContextProxy(FcitxWatcher *watcher,
                                               QObject *parent)
    : QObject(parent), m_fcitxWatcher(watcher), m_portal(false) {
    FcitxFormattedPreedit::registerMetaType();
    FcitxInputContextArgument::registerMetaType();
    connect(m_fcitxWatcher, SIGNAL(availabilityChanged(bool)), this,
            SLOT(availabilityChanged()));
    m_watcher.setWatchMode(QDBusServiceWatcher::WatchForUnregistration);
    connect(&m_watcher, SIGNAL(serviceUnregistered(QString)), this,
            SLOT(serviceUnregistered()));
    availabilityChanged();
}

FcitxInputContextProxy::~FcitxInputContextProxy() {
    if (isValid()) {
        if (m_portal) {
            m_ic1proxy->DestroyIC();
        } else {
            m_icproxy->DestroyIC();
        }
    }
}

void FcitxInputContextProxy::setDisplay(const QString &display) {
    m_display = display;
}

void FcitxInputContextProxy::serviceUnregistered() {
    cleanUp();
    availabilityChanged();
}

void FcitxInputContextProxy::availabilityChanged() {
    QTimer::singleShot(100, this, SLOT(recheck()));
}

void FcitxInputContextProxy::recheck() {
    if (!isValid() && m_fcitxWatcher->availability()) {
        createInputContext();
    }
    if (!m_fcitxWatcher->availability()) {
        cleanUp();
    }
}

void FcitxInputContextProxy::cleanUp() {
    auto services = m_watcher.watchedServices();
    for (const auto &service : services) {
        m_watcher.removeWatchedService(service);
    }

    delete m_improxy;
    m_improxy = nullptr;
    delete m_im1proxy;
    m_im1proxy = nullptr;
    delete m_icproxy;
    m_icproxy = nullptr;
    delete m_ic1proxy;
    m_ic1proxy = nullptr;
    delete m_createInputContextWatcher;
    m_createInputContextWatcher = nullptr;
}

void FcitxInputContextProxy::createInputContext() {
    if (!m_fcitxWatcher->availability()) {
        return;
    }

    cleanUp();

    auto service = m_fcitxWatcher->service();
    auto connection = m_fcitxWatcher->connection();

    auto owner = connection.interface()->serviceOwner(service);
    if (!owner.isValid()) {
        return;
    }

    m_watcher.setConnection(connection);
    m_watcher.setWatchedServices(QStringList() << owner);
    // Avoid race, query again.
    if (!connection.interface()->isServiceRegistered(owner)) {
        cleanUp();
        return;
    }

    QFileInfo info(QCoreApplication::applicationFilePath());
    if (service == "org.freedesktop.portal.Fcitx") {
        m_portal = true;
        m_im1proxy = new org::fcitx::Fcitx::InputMethod1(
            owner, "/org/freedesktop/portal/inputmethod", connection, this);
        FcitxInputContextArgumentList list;
        FcitxInputContextArgument arg;
        arg.setName("program");
        arg.setValue(info.fileName());
        list << arg;
        if (!m_display.isEmpty()) {
            FcitxInputContextArgument arg2;
            arg2.setName("display");
            arg2.setValue(m_display);
            list << arg2;
        }

        auto result = m_im1proxy->CreateInputContext(list);
        m_createInputContextWatcher = new QDBusPendingCallWatcher(result);
        connect(m_createInputContextWatcher,
                SIGNAL(finished(QDBusPendingCallWatcher *)), this,
                SLOT(createInputContextFinished()));
    } else {
        m_portal = false;
        m_improxy = new org::fcitx::Fcitx::InputMethod(owner, "/inputmethod",
                                                       connection, this);
        auto result = m_improxy->CreateICv3(info.fileName(), getpid());
        m_createInputContextWatcher = new QDBusPendingCallWatcher(result);
        connect(m_createInputContextWatcher,
                SIGNAL(finished(QDBusPendingCallWatcher *)), this,
                SLOT(createInputContextFinished()));
    }
}

void FcitxInputContextProxy::createInputContextFinished() {
    if (m_createInputContextWatcher->isError()) {
        cleanUp();
        return;
    }

    if (m_portal) {
        QDBusPendingReply<QDBusObjectPath, QByteArray> reply(
            *m_createInputContextWatcher);
        m_ic1proxy = new org::fcitx::Fcitx::InputContext1(
            m_im1proxy->service(), reply.value().path(),
            m_im1proxy->connection(), this);
        connect(m_ic1proxy, SIGNAL(CommitString(QString)), this,
                SIGNAL(commitString(QString)));
        connect(m_ic1proxy, SIGNAL(CurrentIM(QString, QString, QString)), this,
                SIGNAL(currentIM(QString, QString, QString)));
        connect(m_ic1proxy, SIGNAL(DeleteSurroundingText(int, uint)), this,
                SIGNAL(deleteSurroundingText(int, uint)));
        connect(m_ic1proxy, SIGNAL(ForwardKey(uint, uint, bool)), this,
                SIGNAL(forwardKey(uint, uint, bool)));
        connect(m_ic1proxy,
                SIGNAL(UpdateFormattedPreedit(FcitxFormattedPreeditList, int)),
                this,
                SIGNAL(updateFormattedPreedit(FcitxFormattedPreeditList, int)));
    } else {
        QDBusPendingReply<int, bool, uint, uint, uint, uint> reply(
            *m_createInputContextWatcher);
        QString path = QString("/inputcontext_%1").arg(reply.value());
        m_icproxy = new org::fcitx::Fcitx::InputContext(
            m_improxy->service(), path, m_improxy->connection(), this);
        connect(m_icproxy, SIGNAL(CommitString(QString)), this,
                SIGNAL(commitString(QString)));
        connect(m_icproxy, SIGNAL(CurrentIM(QString, QString, QString)), this,
                SIGNAL(currentIM(QString, QString, QString)));
        connect(m_icproxy, SIGNAL(DeleteSurroundingText(int, uint)), this,
                SIGNAL(deleteSurroundingText(int, uint)));
        connect(m_icproxy, SIGNAL(ForwardKey(uint, uint, int)), this,
                SLOT(forwardKeyWrapper(uint, uint, int)));
        connect(m_icproxy,
                SIGNAL(UpdateFormattedPreedit(FcitxFormattedPreeditList, int)),
                this,
                SLOT(updateFormattedPreeditWrapper(FcitxFormattedPreeditList,
                                                   int)));
    }

    delete m_createInputContextWatcher;
    m_createInputContextWatcher = nullptr;
    emit inputContextCreated();
}

bool FcitxInputContextProxy::isValid() const {
    return (m_icproxy && m_icproxy->isValid()) ||
           (m_ic1proxy && m_ic1proxy->isValid());
}

void FcitxInputContextProxy::forwardKeyWrapper(uint keyval, uint state,
                                               int type) {
    emit forwardKey(keyval, state, type == 1);
}

void FcitxInputContextProxy::updateFormattedPreeditWrapper(
    const FcitxFormattedPreeditList &list, int cursorpos) {
    auto newList = list;
    for (auto item : newList) {
        const qint32 underlineBit = (1 << 3);
        // revert non underline and "underline"
        item.setFormat(item.format() ^ underlineBit);
    }

    emit updateFormattedPreedit(list, cursorpos);
}

QDBusPendingReply<> FcitxInputContextProxy::focusIn() {
    if (m_portal) {
        return m_ic1proxy->FocusIn();
    } else {
        return m_icproxy->FocusIn();
    }
}

QDBusPendingReply<> FcitxInputContextProxy::focusOut() {
    if (m_portal) {
        return m_ic1proxy->FocusOut();
    } else {
        return m_icproxy->FocusOut();
    }
}

QDBusPendingCall FcitxInputContextProxy::processKeyEvent(uint keyval,
                                                         uint keycode,
                                                         uint state, bool type,
                                                         uint time) {
    if (m_portal) {
        return m_ic1proxy->ProcessKeyEvent(keyval, keycode, state, type, time);
    } else {
        return m_icproxy->ProcessKeyEvent(keyval, keycode, state, type ? 1 : 0,
                                          time);
    }
}

QDBusPendingReply<> FcitxInputContextProxy::reset() {
    if (m_portal) {
        return m_ic1proxy->Reset();
    } else {
        return m_icproxy->Reset();
    }
}

QDBusPendingReply<> FcitxInputContextProxy::setCapability(qulonglong caps) {
    if (m_portal) {
        return m_ic1proxy->SetCapability(caps);
    } else {
        return m_icproxy->SetCapacity(static_cast<uint>(caps));
    }
}

QDBusPendingReply<> FcitxInputContextProxy::setCursorRect(int x, int y, int w,
                                                          int h) {
    if (m_portal) {
        return m_ic1proxy->SetCursorRect(x, y, w, h);
    } else {
        return m_icproxy->SetCursorRect(x, y, w, h);
    }
}

QDBusPendingReply<>
FcitxInputContextProxy::setSurroundingText(const QString &text, uint cursor,
                                           uint anchor) {
    if (m_portal) {
        return m_ic1proxy->SetSurroundingText(text, cursor, anchor);
    } else {
        return m_icproxy->SetSurroundingText(text, cursor, anchor);
    }
}

QDBusPendingReply<>
FcitxInputContextProxy::setSurroundingTextPosition(uint cursor, uint anchor) {
    if (m_portal) {
        return m_ic1proxy->SetSurroundingTextPosition(cursor, anchor);
    } else {
        return m_icproxy->SetSurroundingTextPosition(cursor, anchor);
    }
}

bool FcitxInputContextProxy::processKeyEventResult(
    const QDBusPendingCall &call) {
    if (call.isError()) {
        return false;
    }
    if (m_portal) {
        QDBusPendingReply<bool> reply = call;
        return reply.value();
    } else {
        QDBusPendingReply<int> reply = call;
        return reply.value() > 0;
    }
}