/**************************************************************************
    copyright            : (C) 2010 by Anton Sergunov
    email                : setosha@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 "asfpicture.h"

#include "asffile.h"
#include "asfutils.h"

using namespace TagLib;

class ASF::Picture::PicturePrivate
{
public:
  bool valid;
  Type type;
  String mimeType;
  String description;
  ByteVector picture;
};

////////////////////////////////////////////////////////////////////////////////
// Picture class members
////////////////////////////////////////////////////////////////////////////////

ASF::Picture::Picture() :
  d(std::make_shared<PicturePrivate>())
{
  d->valid = true;
}

ASF::Picture::Picture(const Picture &) = default;
ASF::Picture::~Picture() = default;

bool ASF::Picture::isValid() const
{
  return d->valid;
}

String ASF::Picture::mimeType() const
{
  return d->mimeType;
}

void ASF::Picture::setMimeType(const String &value)
{
  d->mimeType = value;
}

ASF::Picture::Type ASF::Picture::type() const
{
  return d->type;
}

void ASF::Picture::setType(const ASF::Picture::Type& t)
{
  d->type = t;
}

String ASF::Picture::description() const
{
  return d->description;
}

void ASF::Picture::setDescription(const String &desc)
{
  d->description = desc;
}

ByteVector ASF::Picture::picture() const
{
  return d->picture;
}

void ASF::Picture::setPicture(const ByteVector &p)
{
  d->picture = p;
}

int ASF::Picture::dataSize() const
{
  return
    9 + (d->mimeType.length() + d->description.length()) * 2 +
    d->picture.size();
}

ASF::Picture &ASF::Picture::operator=(const ASF::Picture &) = default;

void ASF::Picture::swap(Picture &other) noexcept
{
  using std::swap;

  swap(d, other.d);
}

ByteVector ASF::Picture::render() const
{
  if(!isValid())
    return ByteVector();

  return
    ByteVector(static_cast<char>(d->type)) +
    ByteVector::fromUInt(d->picture.size(), false) +
    renderString(d->mimeType) +
    renderString(d->description) +
    d->picture;
}

void ASF::Picture::parse(const ByteVector& bytes)
{
  d->valid = false;
  if(bytes.size() < 9)
    return;
  int pos = 0;
  d->type = static_cast<Type>(bytes[0]); ++pos;
  const unsigned int dataLen = bytes.toUInt(pos, false); pos+=4;

  const ByteVector nullStringTerminator(2, 0);

  int endPos = bytes.find(nullStringTerminator, pos, 2);
  if(endPos < 0)
    return;
  d->mimeType = String(bytes.mid(pos, endPos - pos), String::UTF16LE);
  pos = endPos+2;

  endPos = bytes.find(nullStringTerminator, pos, 2);
  if(endPos < 0)
    return;
  d->description = String(bytes.mid(pos, endPos - pos), String::UTF16LE);
  pos = endPos+2;

  if(dataLen + pos != bytes.size())
    return;

  d->picture = bytes.mid(pos, dataLen);
  d->valid = true;
}

ASF::Picture ASF::Picture::fromInvalid()
{
  Picture ret;
  ret.d->valid = false;
  return ret;
}
