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#include "bbmediastoragelocation.h"

#include <QStandardPaths>

QT_BEGIN_NAMESPACE

BbMediaStorageLocation::BbMediaStorageLocation()
{
}

QDir BbMediaStorageLocation::defaultDir(QCamera::CaptureMode mode) const
{
    QStringList dirCandidates;

    dirCandidates << QLatin1String("shared/camera");

    if (mode == QCamera::CaptureVideo) {
        dirCandidates << QStandardPaths::writableLocation(QStandardPaths::MoviesLocation);
    } else {
        dirCandidates << QStandardPaths::writableLocation(QStandardPaths::PicturesLocation);
    }

    dirCandidates << QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
    dirCandidates << QDir::homePath();
    dirCandidates << QDir::currentPath();
    dirCandidates << QDir::tempPath();

    Q_FOREACH (const QString &path, dirCandidates) {
        if (QFileInfo(path).isWritable())
            return QDir(path);
    }

    return QDir();
}

QString BbMediaStorageLocation::generateFileName(const QString &requestedName, QCamera::CaptureMode mode, const QString &prefix, const QString &extension) const
{
    if (requestedName.isEmpty())
        return generateFileName(prefix, defaultDir(mode), extension);

    if (QFileInfo(requestedName).isDir())
        return generateFileName(prefix, QDir(requestedName), extension);

    return requestedName;
}

QString BbMediaStorageLocation::generateFileName(const QString &prefix, const QDir &dir, const QString &extension) const
{
    const QString lastMediaKey = dir.absolutePath() + QLatin1Char(' ') + prefix + QLatin1Char(' ') + extension;
    qint64 lastMediaIndex = m_lastUsedIndex.value(lastMediaKey, 0);

    if (lastMediaIndex == 0) {
        // first run, find the maximum media number during the fist capture
        Q_FOREACH (const QString &fileName, dir.entryList(QStringList() << QString("%1*.%2").arg(prefix).arg(extension))) {
            const qint64 mediaIndex = fileName.midRef(prefix.length(), fileName.size() - prefix.length() - extension.length() - 1).toInt();
            lastMediaIndex = qMax(lastMediaIndex, mediaIndex);
        }
    }

    // don't just rely on cached lastMediaIndex value,
    // someone else may create a file after camera started
    while (true) {
        const QString name = QString("%1%2.%3").arg(prefix)
                                               .arg(lastMediaIndex + 1, 8, 10, QLatin1Char('0'))
                                               .arg(extension);

        const QString path = dir.absoluteFilePath(name);
        if (!QFileInfo(path).exists()) {
            m_lastUsedIndex[lastMediaKey] = lastMediaIndex + 1;
            return path;
        }

        lastMediaIndex++;
    }

    return QString();
}

QT_END_NAMESPACE
