/*
    Copyright (C) 2017 by Kai Uwe Broulik <kde@privat.broulik.de>
    Copyright (C) 2017 by David Edmundson <davidedmundson@kde.org>

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
*/

#include "tabsrunnerplugin.h"

#include "connection.h"

#include <QDBusConnection>
#include <QGuiApplication>
#include <QHash>
#include <QIcon>
#include <QImage>
#include <QJsonArray>
#include <QJsonObject>
#include <QVariant>

#include <KApplicationTrader>
#include <KLocalizedString>

#include "settings.h"

static const auto s_actionIdMute = QLatin1String("MUTE");
static const auto s_actionIdUnmute = QLatin1String("UNMUTE");

TabsRunnerPlugin::TabsRunnerPlugin(QObject* parent) :
    AbstractKRunnerPlugin(QStringLiteral("/TabsRunner"),
                          QStringLiteral("tabsrunner"),
                          1,
                          parent)
{

}

RemoteActions TabsRunnerPlugin::Actions()
{
    RemoteAction muteAction{
        s_actionIdMute,
        i18n("Mute Tab"),
        QStringLiteral("audio-volume-muted")
    };
    RemoteAction unmuteAction{
        s_actionIdUnmute,
        i18n("Unmute Tab"),
        QStringLiteral("audio-volume-high")
    };

    return {muteAction, unmuteAction};
}

RemoteMatches TabsRunnerPlugin::Match(const QString &searchTerm)
{
    if (searchTerm.length() < 3) {
        sendErrorReply(QDBusError::InvalidArgs, QStringLiteral("Search term too short"));
        return {};
    }

    setDelayedReply(true);

    const bool runQuery = m_requests.isEmpty();

    m_requests.insert(searchTerm, message());

    if (runQuery) {
        sendData(QStringLiteral("getTabs"));
    }

    return {};
}

void TabsRunnerPlugin::Run(const QString &id, const QString &actionId)
{
    bool ok = false;
    const int tabId = id.toInt(&ok);
    if (!ok || tabId < 0) {
        sendErrorReply(QDBusError::InvalidArgs, QStringLiteral("Invalid tab ID"));
        return;
    }

    if (actionId.isEmpty()) {
        sendData(QStringLiteral("activate"), {
            {QStringLiteral("tabId"), tabId}
        });
        return;
    }

    if (actionId == s_actionIdMute || actionId == s_actionIdUnmute) {
        sendData(QStringLiteral("setMuted"), {
            {QStringLiteral("tabId"), tabId},
            {QStringLiteral("muted"), actionId == s_actionIdMute}
        });
        return;
    }

    sendErrorReply(QDBusError::InvalidArgs, QStringLiteral("Unknown action ID"));
}

void TabsRunnerPlugin::handleData(const QString& event, const QJsonObject& json)
{
    if (event == QLatin1String("gotTabs")) {

        const QJsonArray &tabs = json.value(QStringLiteral("tabs")).toArray();

        for (auto it = m_requests.constBegin(), end = m_requests.constEnd(); it != end; ++it) {
            const QString query = it.key();
            const QDBusMessage request = it.value();

            RemoteMatches matches;

            for (auto jt = tabs.constBegin(), jend = tabs.constEnd(); jt != jend; ++jt) {
                const QJsonObject tab = jt->toObject();

                RemoteMatch match;

                const int tabId = tab.value(QStringLiteral("id")).toInt();
                const QString text = tab.value(QStringLiteral("title")).toString();
                const QUrl url(tab.value(QStringLiteral("url")).toString());

                QStringList actions;

                qreal relevance = 0;
                // someone was really busy here, typing the *exact* title or url :D
                if (text.compare(query, Qt::CaseInsensitive) == 0
                        || url.toString().compare(query, Qt::CaseInsensitive) == 0) {
                    match.type = Plasma::QueryMatch::ExactMatch;
                    relevance = 1;
                } else {
                    match.type = Plasma::QueryMatch::PossibleMatch;

                    if (KApplicationTrader::isSubsequence(query, text, Qt::CaseInsensitive)) {
                        relevance = 0.85;
                        if (text.contains(query, Qt::CaseInsensitive)) {
                            relevance += 0.05;
                            if (text.startsWith(query, Qt::CaseInsensitive)) {
                                relevance += 0.05;
                            }
                        }
                    } else if (url.host().contains(query, Qt::CaseInsensitive)) {
                        relevance = 0.7;
                        if (url.host().startsWith(query, Qt::CaseInsensitive)) {
                            relevance += 0.1;
                        }
                    } else if (url.path().contains(query, Qt::CaseInsensitive)) {
                        relevance = 0.5;
                        if (url.path().startsWith(query, Qt::CaseInsensitive)) {
                            relevance += 0.1;
                        }
                    }
                }

                if (!relevance) {
                    continue;
                }

                match.id = QString::number(tabId);
                match.text = text;
                match.properties.insert(QStringLiteral("subtext"), url.toDisplayString());
                match.relevance = relevance;

                const bool audible = tab.value(QStringLiteral("audible")).toBool();

                const QJsonObject mutedInfo = tab.value(QStringLiteral("mutedInfo")).toObject();
                const bool muted = mutedInfo.value(QStringLiteral("muted")).toBool();

                if (audible) {
                    if (muted) {
                        match.iconName = QStringLiteral("audio-volume-muted");
                        actions.append(s_actionIdUnmute);
                    } else {
                        match.iconName = QStringLiteral("audio-volume-high");
                        actions.append(s_actionIdMute);
                    }
                } else {
                    match.iconName = qApp->windowIcon().name();

                    const QImage favIcon = imageFromDataUrl(tab.value(QStringLiteral("favIconData")).toString());
                    if (!favIcon.isNull()) {
                        const RemoteImage remoteImage = serializeImage(favIcon);
                        match.properties.insert(QStringLiteral("icon-data"), QVariant::fromValue(remoteImage));
                    }
                }

                // Has to always be present so it knows we handle actions ourself
                match.properties.insert(QStringLiteral("actions"), actions);

                matches.append(match);
            }

            QDBusConnection::sessionBus().send(
                request.createReply(QVariant::fromValue(matches))
            );
        }

        m_requests.clear();
    }
}
