/**************************************************************************
    copyright            : (C) 2007 by Lukáš Lalinský
    email                : lalinsky@gmail.com
 **************************************************************************/

/***************************************************************************
 *   This library is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU Lesser General Public License version   *
 *   2.1 as published by the Free Software Foundation.                     *
 *                                                                         *
 *   This library 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     *
 *   Lesser General Public License for more details.                       *
 *                                                                         *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this library; if not, write to the Free Software   *
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA         *
 *   02110-1301  USA                                                       *
 *                                                                         *
 *   Alternatively, this file is available under the Mozilla Public        *
 *   License Version 1.1.  You may obtain a copy of the License at         *
 *   http://www.mozilla.org/MPL/                                           *
 ***************************************************************************/

#include "tdebug.h"
#include "tstring.h"
#include "tpropertymap.h"
#include "tagutils.h"

#include "mp4atom.h"
#include "mp4tag.h"
#include "mp4file.h"

using namespace Strawberry_TagLib::TagLib;

namespace {
bool checkValid(const MP4::AtomList &list) {

  for (MP4::AtomList::ConstIterator it = list.begin(); it != list.end(); ++it) {

    if ((*it)->length == 0)
      return false;

    if (!checkValid((*it)->children))
      return false;
  }

  return true;

}
}  // namespace

class MP4::File::FilePrivate {
 public:
  explicit FilePrivate() : tag(nullptr), atoms(nullptr), properties(nullptr) {}

  ~FilePrivate() {
    delete atoms;
    delete tag;
    delete properties;
  }

  MP4::Tag *tag;
  MP4::Atoms *atoms;
  MP4::AudioProperties *properties;
};

////////////////////////////////////////////////////////////////////////////////
// static members
////////////////////////////////////////////////////////////////////////////////

bool MP4::File::isSupported(IOStream *stream) {

  // An MP4 file has to have an "ftyp" box first.

  const ByteVector id = Utils::readHeader(stream, 8, false);
  return id.containsAt("ftyp", 4);

}

////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////

MP4::File::File(FileName file, bool readProperties, AudioProperties::ReadStyle) : Strawberry_TagLib::TagLib::File(file), d(new FilePrivate()) {

  if (isOpen())
    read(readProperties);

}

MP4::File::File(IOStream *stream, bool readProperties, AudioProperties::ReadStyle) : Strawberry_TagLib::TagLib::File(stream), d(new FilePrivate()) {

  if (isOpen())
    read(readProperties);

}

MP4::File::~File() {
  delete d;
}

MP4::Tag *
MP4::File::tag() const {
  return d->tag;
}

MP4::AudioProperties *
MP4::File::audioProperties() const {
  return d->properties;
}

void MP4::File::read(bool readProperties) {

  if (!isValid())
    return;

  d->atoms = new Atoms(this);
  if (!checkValid(d->atoms->atoms)) {
    setValid(false);
    return;
  }

  // must have a moov atom, otherwise consider it invalid
  if (!d->atoms->find("moov")) {
    setValid(false);
    return;
  }

  d->tag = new Tag(this, d->atoms);
  if (readProperties) {
    d->properties = new AudioProperties(this, d->atoms);
  }

}

bool MP4::File::save() {

  if (readOnly()) {
    debug("MP4::File::save() -- File is read only.");
    return false;
  }

  if (!isValid()) {
    debug("MP4::File::save() -- Trying to save invalid file.");
    return false;
  }

  return d->tag->save();

}

bool MP4::File::hasMP4Tag() const {
  return (d->atoms->find("moov", "udta", "meta", "ilst") != nullptr);
}