/* This file is part of Clementine.
   Copyright 2010, David Sansome <me@davidsansome.com>

   Clementine is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Clementine 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef UTILITIES_H
#define UTILITIES_H

#include <memory>

#include <QColor>
#include <QFile>
#include <QLocale>
#include <QCryptographicHash>
#include <QSize>
#include <QString>
#include <QUrl>

class QIODevice;
class QMouseEvent;
class QXmlStreamReader;
struct QMetaObject;

namespace Utilities {
QString PrettyTime(int seconds);
QString PrettyTimeDelta(int seconds);
QString PrettyTimeNanosec(qint64 nanoseconds);
QString PrettySize(quint64 bytes);
QString PrettySize(const QSize& size);
QString WordyTime(quint64 seconds);
QString WordyTimeNanosec(qint64 nanoseconds);
QString Ago(int seconds_since_epoch, const QLocale& locale);
QString PrettyFutureDate(const QDate& date);

QString ColorToRgba(const QColor& color);

quint64 FileSystemCapacity(const QString& path);
quint64 FileSystemFreeSpace(const QString& path);

QString MakeTempDir(const QString template_name = QString());
QString GetTemporaryFileName();
void RemoveRecursive(const QString& path);
bool CopyRecursive(const QString& source, const QString& destination);
bool Copy(QIODevice* source, QIODevice* destination);

void OpenInFileBrowser(const QList<QUrl>& filenames);

enum HashFunction { Md5_Algo, Sha256_Algo, Sha1_Algo, };
QByteArray Hmac(const QByteArray& key, const QByteArray& data,
                HashFunction algo);
QByteArray HmacMd5(const QByteArray& key, const QByteArray& data);
QByteArray HmacSha256(const QByteArray& key, const QByteArray& data);
QByteArray HmacSha1(const QByteArray& key, const QByteArray& data);
QByteArray Sha256(const QByteArray& data);
QByteArray Sha1File(QFile& file);
QByteArray Sha1CoverHash(const QString& artist, const QString& album);

// Picks an unused ephemeral port number.  Doesn't hold the port open so
// there's the obvious race condition
quint16 PickUnusedPort();

// Forwards a mouse event to a different widget, remapping the event's widget
// coordinates relative to those of the target widget.
void ForwardMouseEvent(const QMouseEvent* e, QWidget* target);

// Checks if the mouse event was inside the widget's rectangle.
bool IsMouseEventInWidget(const QMouseEvent* e, const QWidget* widget);

// Reads all children of the current element, and returns with the stream
// reader either on the EndElement for the current element, or the end of the
// file - whichever came first.
void ConsumeCurrentElement(QXmlStreamReader* reader);

// Advances the stream reader until it finds an element with the given name.
// Returns false if the end of the document was reached before finding a
// matching element.
bool ParseUntilElement(QXmlStreamReader* reader, const QString& name);

// Parses a string containing an RFC822 time and date.
QDateTime ParseRFC822DateTime(const QString& text);

// Replaces some HTML entities with their normal characters.
QString DecodeHtmlEntities(const QString& text);

// Shortcut for getting a Qt-aware enum value as a string.
// Pass in the QMetaObject of the class that owns the enum, the string name of
// the enum and a valid value from that enum.
const char* EnumToString(const QMetaObject& meta, const char* name, int value);

QStringList Prepend(const QString& text, const QStringList& list);
QStringList Updateify(const QStringList& list);

// Check if two urls are on the same drive (mainly for windows)
bool UrlOnSameDriveAsClementine(const QUrl& url);

// Get relative path to clementine binary
QUrl GetRelativePathToClementineBin(const QUrl& url);

// Get the path without the filename extension
QString PathWithoutFilenameExtension(const QString& filename);
QString FiddleFileExtension(const QString& filename,
                            const QString& new_extension);

enum ConfigPath {
  Path_Root,
  Path_AlbumCovers,
  Path_NetworkCache,
  Path_GstreamerRegistry,
  Path_DefaultMusicLibrary,
  Path_LocalSpotifyBlob,
  Path_MoodbarCache,
  Path_CacheRoot,
};
QString GetConfigPath(ConfigPath config);

// Returns the minor version of OS X (ie. 6 for Snow Leopard, 7 for Lion).
qint32 GetMacVersion();

// Borrowed from schedutils
enum IoPriority {
  IOPRIO_CLASS_NONE = 0,
  IOPRIO_CLASS_RT,
  IOPRIO_CLASS_BE,
  IOPRIO_CLASS_IDLE,
};
enum { IOPRIO_WHO_PROCESS = 1, IOPRIO_WHO_PGRP, IOPRIO_WHO_USER, };
static const int IOPRIO_CLASS_SHIFT = 13;

int SetThreadIOPriority(IoPriority priority);
int GetThreadId();

// Returns true if this machine has a battery.
bool IsLaptop();

QString SystemLanguageName();
}

class ScopedWCharArray {
 public:
  ScopedWCharArray(const QString& str);

  QString ToString() const { return QString::fromWCharArray(data_.get()); }

  wchar_t* get() const { return data_.get(); }
  operator wchar_t*() const { return get(); }

  int characters() const { return chars_; }
  int bytes() const { return (chars_ + 1) * sizeof(wchar_t); }

 private:
  Q_DISABLE_COPY(ScopedWCharArray);

  int chars_;
  std::unique_ptr<wchar_t[]> data_;
};

#endif  // UTILITIES_H
