/*
    This file is part of the syndication library
    SPDX-FileCopyrightText: 2006 Frank Osterfeld <osterfeld@kde.org>

    SPDX-License-Identifier: LGPL-2.0-or-later
*/

#include "document.h"
#include "dublincore.h"
#include "image.h"
#include "item.h"
#include "model.h"
#include "model_p.h"
#include "resource.h"
#include "rssvocab.h"
#include "sequence.h"
#include "statement.h"
#include "syndicationinfo.h"
#include "textinput.h"

#include <documentvisitor.h>
#include <tools.h>

#include <QList>
#include <QString>
#include <QStringList>
#include <QVector>

#include <algorithm>

namespace Syndication
{
namespace RDF
{
class SYNDICATION_NO_EXPORT Document::Private
{
public:
    Private()
        : itemTitleContainsMarkup(false)
        , itemTitlesGuessed(false)
        , itemDescriptionContainsMarkup(false)
        , itemDescGuessed(false)
    {
    }
    mutable bool itemTitleContainsMarkup;
    mutable bool itemTitlesGuessed;
    mutable bool itemDescriptionContainsMarkup;
    mutable bool itemDescGuessed;
    QSharedPointer<Model::ModelPrivate> modelPrivate;
};

Document::Document()
    : Syndication::SpecificDocument()
    , ResourceWrapper()
    , d(new Private)
{
    d->modelPrivate = resource()->model().d;
}

Document::Document(ResourcePtr resource)
    : Syndication::SpecificDocument()
    , ResourceWrapper(resource)
    , d(new Private)
{
    d->modelPrivate = resource->model().d;
}

Document::Document(const Document &other)
    : SpecificDocument(other)
    , ResourceWrapper(other)
    , d(new Private)
{
    *d = *(other.d);
}

Document::~Document() = default;

bool Document::operator==(const Document &other) const
{
    return ResourceWrapper::operator==(other);
}

Document &Document::operator=(const Document &other)
{
    ResourceWrapper::operator=(other);
    *d = *(other.d);

    return *this;
}

bool Document::accept(DocumentVisitor *visitor)
{
    return visitor->visitRDFDocument(this);
}

bool Document::isValid() const
{
    return !isNull();
}

QString Document::title() const
{
    const QString str = resource()->property(RSSVocab::self()->title())->asString();
    return normalize(str);
}

QString Document::description() const
{
    const QString str = resource()->property(RSSVocab::self()->description())->asString();
    return normalize(str);
}

QString Document::link() const
{
    return resource()->property(RSSVocab::self()->link())->asString();
}

DublinCore Document::dc() const
{
    return DublinCore(resource());
}

SyndicationInfo Document::syn() const
{
    return SyndicationInfo(resource());
}

struct SortItem {
    Item item;
    int index;
};

struct LessThanByIndex {
    bool operator()(const SortItem &lhs, const SortItem &rhs) const
    {
        return lhs.index < rhs.index;
    }
};

static QList<Item> sortListToMatchSequence(QList<Item> items, const QStringList &uriSequence)
{
    QVector<SortItem> toSort;
    toSort.reserve(items.size());
    for (const Item &i : items) {
        SortItem item;
        item.item = i;
        item.index = uriSequence.indexOf(i.resource()->uri());
        toSort.append(item);
    }
    std::sort(toSort.begin(), toSort.end(), LessThanByIndex());

    int i = 0;
    for (const SortItem &sortItem : std::as_const(toSort)) {
        items[i] = sortItem.item;
        i++;
    }

    return items;
}

struct UriLessThan {
    bool operator()(const RDF::ResourcePtr &lhs, const RDF::ResourcePtr &rhs) const
    {
        return lhs->uri() < rhs->uri();
    }
};

QList<Item> Document::items() const
{
    QList<ResourcePtr> items = resource()->model().resourcesWithType(RSSVocab::self()->item());
    // if there is no sequence, ensure sorting by URI to have a defined and deterministic order
    // important for unit tests
    std::sort(items.begin(), items.end(), UriLessThan());

    DocumentPtr doccpy(new Document(*this));

    QList<Item> list;
    list.reserve(items.count());

    for (const ResourcePtr &i : std::as_const(items)) {
        list.append(Item(i, doccpy));
    }

    if (resource()->hasProperty(RSSVocab::self()->items())) {
        NodePtr n = resource()->property(RSSVocab::self()->items())->object();
        if (n->isSequence()) {
            const SequencePtr seq = n.staticCast<Sequence>();

            const QList<NodePtr> seqItems = seq->items();

            QStringList uriSequence;
            uriSequence.reserve(seqItems.size());

            for (const NodePtr &i : seqItems) {
                if (i->isResource()) {
                    uriSequence.append(i.staticCast<Resource>()->uri());
                }
            }
            list = sortListToMatchSequence(list, uriSequence);
        }
    }

    return list;
}

Image Document::image() const
{
    ResourcePtr img = resource()->property(RSSVocab::self()->image())->asResource();

    return img ? Image(img) : Image();
}

TextInput Document::textInput() const
{
    ResourcePtr ti = resource()->property(RSSVocab::self()->textinput())->asResource();

    return ti ? TextInput(ti) : TextInput();
}

void Document::getItemTitleFormatInfo(bool *containsMarkup) const
{
    if (!d->itemTitlesGuessed) {
        QString titles;
        QList<Item> litems = items();

        if (litems.isEmpty()) {
            d->itemTitlesGuessed = true;
            return;
        }

        const int nmax = std::min<int>(litems.size(), 10); // we check a maximum of 10 items
        int i = 0;

        for (const auto &item : litems) {
            if (i++ >= nmax) {
                break;
            }
            titles += item.originalTitle();
        }

        d->itemTitleContainsMarkup = stringContainsMarkup(titles);
        d->itemTitlesGuessed = true;
    }
    if (containsMarkup != nullptr) {
        *containsMarkup = d->itemTitleContainsMarkup;
    }
}

void Document::getItemDescriptionFormatInfo(bool *containsMarkup) const
{
    if (!d->itemDescGuessed) {
        QString desc;
        QList<Item> litems = items();

        if (litems.isEmpty()) {
            d->itemDescGuessed = true;
            return;
        }

        const int nmax = std::min<int>(litems.size(), 10); // we check a maximum of 10 items
        int i = 0;

        for (const auto &item : litems) {
            if (i++ >= nmax) {
                break;
            }
            desc += item.originalDescription();
        }

        d->itemDescriptionContainsMarkup = stringContainsMarkup(desc);
        d->itemDescGuessed = true;
    }

    if (containsMarkup != nullptr) {
        *containsMarkup = d->itemDescriptionContainsMarkup;
    }
}

QString Document::debugInfo() const
{
    QString info;
    info += QLatin1String("### Document: ###################\n");
    info += QLatin1String("title: #") + title() + QLatin1String("#\n");
    info += QLatin1String("link: #") + link() + QLatin1String("#\n");
    info += QLatin1String("description: #") + description() + QLatin1String("#\n");
    info += dc().debugInfo();
    info += syn().debugInfo();
    Image img = image();
    if (!img.resource() == 0L) {
        info += img.debugInfo();
    }
    TextInput input = textInput();
    if (!input.isNull()) {
        info += input.debugInfo();
    }

    const QList<Item> itlist = items();
    for (const auto &item : itlist) {
        info += item.debugInfo();
    }

    info += QLatin1String("### Document end ################\n");
    return info;
}

} // namespace RDF
} // namespace Syndication