/*
   SPDX-FileCopyrightText: 2016 (c) Matthieu Gallien <matthieu_gallien@yahoo.fr>
   SPDX-FileCopyrightText: 2018 (c) Alexander Stippich <a.stippich@gmx.net>

   SPDX-License-Identifier: LGPL-3.0-or-later
 */

#include "filebrowserproxymodel.h"

#include "filebrowsermodel.h"
#include "mediaplaylistproxymodel.h"

#include "models/modelLogging.h"

#include <stack>

FileBrowserProxyModel::FileBrowserProxyModel(QObject *parent)
    : KDirSortFilterProxyModel(parent)
{
    setFilterCaseSensitivity(Qt::CaseInsensitive);
    setSortFoldersFirst(true);
    sort(Qt::AscendingOrder);
}

FileBrowserProxyModel::~FileBrowserProxyModel() = default;

QString FileBrowserProxyModel::filterText() const
{
    return mFilterText;
}

void FileBrowserProxyModel::setFilterText(const QString &filterText)
{
    if (mFilterText == filterText)
        return;

    mFilterText = filterText;

    mFilterExpression.setPattern(mFilterText.normalized(QString::NormalizationForm_KC));
    mFilterExpression.setPatternOptions(QRegularExpression::CaseInsensitiveOption);
    mFilterExpression.optimize();

    setFilterRegularExpression(mFilterExpression);
    setFilterRole(Qt::DisplayRole);

    Q_EMIT filterTextChanged(mFilterText);
}

void FileBrowserProxyModel::listRecursiveResult(KJob *)
{
    if (mPendingEntries.empty()) {
        mEnqueueInProgress = false;
        Q_EMIT entriesToEnqueue(mAllData, mEnqueueMode, mTriggerPlay);
        return;
    }

    recursiveEnqueue();
}

void FileBrowserProxyModel::listRecursiveNewEntries(KIO::Job *job, const KIO::UDSEntryList &list)
{
    Q_UNUSED(job)

    DataTypes::EntryDataList newData;

    auto vNewEntries = QList<QString>{};

    vNewEntries.reserve(list.size());

    for (const auto &oneEntry : list) {
        if (oneEntry.isDir()) {
            continue;
        }

        vNewEntries.push_back(oneEntry.stringValue(KIO::UDSEntry::UDS_NAME));
    }

    std::sort(std::begin(vNewEntries), std::end(vNewEntries), [this](auto first, auto second) {
        return (sortOrder() == Qt::AscendingOrder) ? (first < second) : (first > second);
    });

    for (const auto &oneEntry : std::as_const(vNewEntries)) {
        auto fullPath = QString{};
        auto fullPathUrl = QUrl{};

        if (mCurentUrl.isLocalFile()) {
            fullPath = QStringLiteral("%0/%1").arg(mCurentUrl.toLocalFile(), oneEntry);
            fullPathUrl = QUrl::fromLocalFile(fullPath);
        } else {
            fullPath = QStringLiteral("%0/%1").arg(mCurentUrl.toString(), oneEntry);
            fullPathUrl = QUrl{fullPath};
        }

        auto mimeType = mMimeDatabase.mimeTypeForUrl(fullPathUrl);

        if (!mimeType.name().startsWith(QLatin1String("audio/")) || ElisaUtils::isPlayList(mimeType)) {
            continue;
        }

        newData.push_back({{{DataTypes::ElementTypeRole, ElisaUtils::FileName}, {DataTypes::ResourceRole, fullPathUrl}}, fullPath, {}});
    }

    mAllData.append(newData);
}

void FileBrowserProxyModel::genericEnqueueToPlayList(const QModelIndex &rootIndex,
                                                     ElisaUtils::PlayListEnqueueMode enqueueMode,
                                                     ElisaUtils::PlayListEnqueueTriggerPlay triggerPlay)
{
    if (mEnqueueInProgress) {
        // display error
        return;
    }

    mPendingEntries = {};
    mAllData.clear();

    for (int rowIndex = 0, maxRowCount = rowCount(); rowIndex < maxRowCount; ++rowIndex) {
        auto currentIndex = index(rowIndex, 0, rootIndex);
        mPendingEntries.emplace(currentIndex.data(DataTypes::FilePathRole).toUrl(),
                                currentIndex.data(DataTypes::ElementTypeRole).value<ElisaUtils::PlayListEntryType>() == ElisaUtils::Container);
    }

    mEnqueueInProgress = true;
    mEnqueueMode = enqueueMode;
    mTriggerPlay = triggerPlay;
    recursiveEnqueue();
}

void FileBrowserProxyModel::enqueueAll(ElisaUtils::PlayListEnqueueMode enqueueMode, ElisaUtils::PlayListEnqueueTriggerPlay triggerPlay)
{
    genericEnqueueToPlayList(QModelIndex{}, enqueueMode, triggerPlay);
}

void FileBrowserProxyModel::enqueue(const DataTypes::MusicDataType &newEntry,
                                    const QString &newEntryTitle,
                                    ElisaUtils::PlayListEnqueueMode enqueueMode,
                                    ElisaUtils::PlayListEnqueueTriggerPlay triggerPlay)
{
    Q_UNUSED(newEntryTitle)

    if (mEnqueueInProgress) {
        // display error
        return;
    }

    mPendingEntries = {};
    mAllData.clear();

    switch (newEntry.elementType())
    {
    case ElisaUtils::Container:
        mPendingEntries.emplace(newEntry[DataTypes::FilePathRole].toUrl(), true);
        break;
    case ElisaUtils::FileName:
    case ElisaUtils::Track:
        mPendingEntries.emplace(newEntry[DataTypes::ResourceRole].toUrl(), false);
        break;
    case ElisaUtils::PlayList:
        if (mPlayList) {
            QMetaObject::invokeMethod(mPlayList,
                                      "loadPlayList",
                                      Q_ARG(QUrl, newEntry[DataTypes::ResourceRole].toUrl()),
                                      Q_ARG(ElisaUtils::PlayListEnqueueMode, enqueueMode),
                                      Q_ARG(ElisaUtils::PlayListEnqueueTriggerPlay, triggerPlay));
        }
        return;
    case ElisaUtils::Album:
    case ElisaUtils::Artist:
    case ElisaUtils::Composer:
    case ElisaUtils::Genre:
    case ElisaUtils::Lyricist:
    case ElisaUtils::Radio:
    case ElisaUtils::Unknown:
        break;
    }

    if (mPendingEntries.empty()) {
        return;
    }

    mEnqueueInProgress = true;
    mEnqueueMode = enqueueMode;
    mTriggerPlay = triggerPlay;
    recursiveEnqueue();
}

void FileBrowserProxyModel::disconnectPlayList()
{
    if (mPlayList) {
        disconnect(this, &FileBrowserProxyModel::entriesToEnqueue,
                   mPlayList, static_cast<void (MediaPlayListProxyModel::*)(const DataTypes::EntryDataList &, ElisaUtils::PlayListEnqueueMode, ElisaUtils::PlayListEnqueueTriggerPlay)>(&MediaPlayListProxyModel::enqueue));
    }
}

void FileBrowserProxyModel::connectPlayList()
{
    if (mPlayList) {
        connect(this, &FileBrowserProxyModel::entriesToEnqueue,
                mPlayList, static_cast<void (MediaPlayListProxyModel::*)(const DataTypes::EntryDataList &, ElisaUtils::PlayListEnqueueMode, ElisaUtils::PlayListEnqueueTriggerPlay)>(&MediaPlayListProxyModel::enqueue));
    }
}

void FileBrowserProxyModel::recursiveEnqueue()
{
    if (mPendingEntries.empty()) {
        mEnqueueInProgress = false;
        Q_EMIT entriesToEnqueue(mAllData, mEnqueueMode, mTriggerPlay);
        return;
    }

    auto [rootUrl, isDirectory] = mPendingEntries.front();

    if (rootUrl.isEmpty()) {
        return;
    }

    mPendingEntries.pop();
    if (isDirectory) {
        mCurentUrl = rootUrl;
        mCurrentJob = KIO::listRecursive(rootUrl, { KIO::HideProgressInfo });

        connect(mCurrentJob, &KJob::result, this, &FileBrowserProxyModel::listRecursiveResult);

        connect(dynamic_cast<KIO::ListJob*>(mCurrentJob), &KIO::ListJob::entries,
                this, &FileBrowserProxyModel::listRecursiveNewEntries);
    } else {
        if (mPlayList) {
            if (!ElisaUtils::isPlayList(mMimeDatabase.mimeTypeForUrl(rootUrl))) {
                mAllData.push_back({{{DataTypes::ElementTypeRole, ElisaUtils::FileName}, {DataTypes::ResourceRole, rootUrl}}, rootUrl.toString(), rootUrl});
            }
            recursiveEnqueue();
        }
    }
}

void FileBrowserProxyModel::setSourceModel(QAbstractItemModel *sourceModel)
{
    KDirSortFilterProxyModel::setSourceModel(sourceModel);

    auto fileBrowserModel = dynamic_cast<FileBrowserModel *>(sourceModel);

    if (!fileBrowserModel) {
        return;
    }
}

MediaPlayListProxyModel *FileBrowserProxyModel::playList() const
{
    return mPlayList;
}

int FileBrowserProxyModel::filterRating() const
{
    return mFilterRating;
}

bool FileBrowserProxyModel::sortedAscending() const
{
    return sortOrder() ? false : true;
}

void FileBrowserProxyModel::sortModel(Qt::SortOrder order)
{
    sort(0, order);
    Q_EMIT sortedAscendingChanged();
}

void FileBrowserProxyModel::setPlayList(MediaPlayListProxyModel *playList)
{
    disconnectPlayList();

    if (mPlayList == playList) {
        return;
    }

    mPlayList = playList;
    Q_EMIT playListChanged();

    connectPlayList();
}

void FileBrowserProxyModel::setFilterRating(int filterRating)
{
    if (mFilterRating == filterRating) {
        return;
    }

    mFilterRating = filterRating;
    Q_EMIT filterRatingChanged();
}

#include "moc_filebrowserproxymodel.cpp"
