/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Mobility Components.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
**     of its contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
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**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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****************************************************************************/

#include "utility.h"

#include <QtCore>

#define QT_GALLERY_MEDIA_ART_ILLEGAL_CHARACTERS \
    "\\(.*\\)|\\{.*\\}|\\[.*\\]|<.*>|[\\(\\)_\\{\\}\\[\\]\\!@#$\\^&\\*\\+\\=\\|\\\\/\"'\\?~`]"

Utility::Utility(QObject *parent)
    : QObject(parent)
#if defined(Q_OS_UNIX) && !(defined(Q_OS_SYMBIAN) || defined(Q_OS_MAC))
    , illegalCharacters(QLatin1String(QT_GALLERY_MEDIA_ART_ILLEGAL_CHARACTERS))
    , whitespace(QCryptographicHash::hash(" ", QCryptographicHash::Md5).toHex())
#endif
{
}

Utility::~Utility()
{
}

QString Utility::formatDuration(int duration) const
{
    const int seconds = duration % 60;
    const int minutes = (duration /= 60) % 60;
    const int hours = duration / 60;

    QTime time(hours, minutes, seconds);

    return time.hour() > 0
            ? time.toString(tr("h:mm:ss"))
            : time.toString(tr("mm:ss"));
}

#if defined(Q_OS_UNIX) && !(defined(Q_OS_SYMBIAN) || defined(Q_OS_MAC))
QUrl Utility::getAlbumArtUrl(const QString &artist, const QString &title) const
{
    QString fileName = QDir::homePath()
            + QLatin1String("/.cache/media-art/album-")
            + hash(artist)
            + QLatin1Char('-')
            + hash(title)
            + QLatin1String(".jpeg");

    if (QFile::exists(fileName))
        return QUrl::fromLocalFile(fileName);

    return QUrl();

}

QUrl Utility::getAlbumArtThumbnailUrl(const QString &artist, const QString &title) const
{
    QUrl albumUrl = getAlbumArtUrl(artist, title);

    if (albumUrl.isValid()) {
#if defined(Q_WS_MAEMO_5)
        QString thumbnailPath = QDir::homePath()
                + QLatin1String("/.thumbnails/cropped/")
                + QCryptographicHash::hash(
                        albumUrl.toString().toUtf8(), QCryptographicHash::Md5).toHex()
                + QLatin1String(".jpeg");
#elif defined(Q_WS_MAEMO_6)
        QString thumbnailPath = QDir::homePath()
                + QLatin1String("/.thumbnails/grid/")
                + QCryptographicHash::hash(
                        albumUrl.toString().toUtf8(), QCryptographicHash::Md5).toHex()
                + QLatin1String(".jpeg");
#else
        QString thumbnailPath = QDir::homePath()
                + QLatin1String("/.thumbnails/normal/")
                + QCryptographicHash::hash(
                        albumUrl.toEncoded(), QCryptographicHash::Md5).toHex()
                + QLatin1String(".png");
#endif
        if (QFile::exists(thumbnailPath))
            return QUrl::fromLocalFile(thumbnailPath);
    }
    return albumUrl;
}

QString Utility::hash(const QString &identifier) const
{
    if (identifier.isEmpty()) {
        return whitespace;
    } else {
        return QCryptographicHash::hash(
                identifier.toLower().remove(illegalCharacters).simplified().toUtf8(),
                QCryptographicHash::Md5).toHex();
    }
}

#else

QUrl Utility::getAlbumArtUrl(const QString &, const QString &) const
{
    return QUrl();
}

QUrl Utility::getAlbumArtThumbnailUrl(const QString &, const QString &) const
{
    return QUrl();
}

#endif