/*
 * Copyright (C) 2017 Jesse Pullinen <jesse12p@gmail.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) version 3, or any
 * later version accepted by the membership of KDE e.V. (or its
 * successor approved by the membership of KDE e.V.), which shall
 * act as a proxy defined in Section 6 of version 3 of the license.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "AcbfData.h"
#include "AcbfDocument.h"

#include <QString>

#include <acbf_debug.h>

using namespace AdvancedComicBookFormat;

class Data::Private
{
public:
    Private(Data *qq)
        : q(qq)
    {
    }
    Data *q;
    QMultiHash<QString, Binary *> binariesById;
    QObjectList binaries;

    void addBinary(Binary *binary, bool emitListChangeSignal = true)
    {
        binariesById.insert(binary->id(), binary);
        binaries << binary;
        QObject::connect(binary, &Binary::contentTypeChanged, q, &Data::binariesChanged);
        QObject::connect(binary, &Binary::dataChanged, q, &Data::binariesChanged);
        QObject::connect(binary, &Binary::idChanged, q, [this, binary]() {
            binariesById.removeIf([&binary](QMultiHash<QString, Binary *>::iterator it) {
                return it.value() == binary;
            });
            binariesById.insert(binary->id(), binary);
            Q_EMIT q->binariesChanged();
        });
        QObject::connect(binary, &QObject::destroyed, q, [this, binary]() {
            binariesById.remove(binariesById.key(binary));
            binaries.removeAll(binary);
            Q_EMIT q->binariesChanged();
        });
        Q_EMIT q->binaryAdded(binary);
        if (emitListChangeSignal) {
            Q_EMIT q->binariesChanged();
        }
    }
};

Data::Data(Document *parent)
    : QObject(parent)
    , d(new Private(this))
{
    static const int typeId = qRegisterMetaType<Data *>("Data*");
    Q_UNUSED(typeId);
}

Data::~Data() = default;

void Data::toXml(QXmlStreamWriter *writer)
{
    writer->writeStartElement(QStringLiteral("data"));

    for (Binary *binary : d->binariesById) {
        binary->toXml(writer);
    }

    writer->writeEndElement();
}

bool Data::fromXml(QXmlStreamReader *xmlReader)
{
    while (xmlReader->readNextStartElement()) {
        if (xmlReader->name() == QStringLiteral("binary")) {
            Binary *newBinary = new Binary(this);
            if (!newBinary->fromXml(xmlReader)) {
                return false;
            }
            d->addBinary(newBinary, false);
        } else {
            qCWarning(ACBF_LOG) << Q_FUNC_INFO << "currently unsupported subsection:" << xmlReader->name();
            xmlReader->skipCurrentElement();
        }
    }
    if (xmlReader->hasError()) {
        qCWarning(ACBF_LOG) << Q_FUNC_INFO << "Failed to read ACBF XML document at token" << xmlReader->name() << "(" << xmlReader->lineNumber() << ":"
                            << xmlReader->columnNumber() << ") The reported error was:" << xmlReader->errorString();
    }
    qCDebug(ACBF_LOG) << Q_FUNC_INFO << "Created data with" << d->binariesById.count() << "binaries";
    Q_EMIT binariesChanged();

    return !xmlReader->hasError();
}

Binary *Data::addBinary(const QString &id)
{
    Binary *newBinary = new Binary(this);
    newBinary->setId(id);
    d->addBinary(newBinary);
    return newBinary;
}

Binary *Data::binary(const QString &id) const
{
    return d->binariesById.value(id);
}

QStringList Data::binaryIds() const
{
    return d->binariesById.keys();
}

QObjectList Data::binaries() const
{
    return d->binaries;
}

int Data::binaryIndex(Binary *binary)
{
    return d->binaries.indexOf(binary);
}

void Data::swapBinaries(QObject *swapThis, QObject *withThis)
{
    int first = d->binaries.indexOf(swapThis);
    int second = d->binaries.indexOf(withThis);
    swapBinariesByIndex(first, second);
}

void Data::swapBinariesByIndex(int swapThis, int withThis)
{
    if (swapThis > -1 && swapThis < d->binaries.count() && withThis > -1 && withThis < d->binaries.count()) {
        d->binaries.swapItemsAt(swapThis, withThis);
        InternalReferenceObject *first = qobject_cast<InternalReferenceObject *>(d->binaries[swapThis]);
        InternalReferenceObject *second = qobject_cast<InternalReferenceObject *>(d->binaries[withThis]);
        Q_EMIT first->propertyDataChanged();
        Q_EMIT second->propertyDataChanged();
        Q_EMIT binariesChanged();
    } else {
        qCWarning(ACBF_LOG) << "There was an attempt to swap two binaries, and at least one of them was outside the bounds of the current list:" << swapThis
                            << withThis;
    }
}
