/**
 * \file attributedata.h
 * String representation of attribute data.
 *
 * \b Project: Kid3
 * \author Urs Fleisch
 * \date 28 Mar 2009
 *
 * Copyright (C) 2009-2018  Urs Fleisch
 *
 * This file is part of Kid3.
 *
 * Kid3 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 2 of the License, or
 * (at your option) any later version.
 *
 * Kid3 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include <QString>
#include <QByteArray>
#include "kid3api.h"

/** Attribute data used e.g. by Windows Media Player. */
class KID3_CORE_EXPORT AttributeData {
public:
  /** Attribute data types. */
  enum Type {
    Unknown, /**< Unknown type */
    Utf16,   /**< UTF-16 encoded, zero-terminated Unicode string */
    Guid,    /**< 128-bit GUID */
    DWord,   /**< 32-bit value little-endian */
    Binary   /**< Binary data */
  };

  /**
   * Constructor.
   *
   * @param type type
   */
  explicit AttributeData(Type type)
  {
    m_type = type;
  }

  /**
   * Constructor.
   *
   * @param name owner of Windows media PRIV frame
   */
  explicit AttributeData(const QString& name);

  /**
   * Destructor.
   */
  ~AttributeData() {}

  /**
   * Get type.
   * @return type.
   */
  Type getType() const { return m_type; }

  /**
   * Convert attribute data to string.
   *
   * @param data byte array with data
   * @param str  result string
   *
   * @return true if ok.
   */
  bool toString(const QByteArray& data, QString& str);

  /**
   * Convert attribute data string to byte array.
   *
   * @param str  string representation of data
   * @param data result data
   *
   * @return true if ok.
   */
  bool toByteArray(const QString& str, QByteArray& data);

  /**
   * Check if a string represents a hexadecimal number, i.e.
   * contains only characters 0..9, A..F, a..f.
   *
   * @param str string to check
   * @param lastAllowedLetter last allowed character (normally 'F')
   * @param additionalChars additional allowed characters
   *
   * @return true if string has hex format.
   */
  static bool isHexString(const QString& str, char lastAllowedLetter = 'F',
                          const QString& additionalChars = QString());

private:
  Type m_type;
};
