/*=============================================================================

  Library: CTK

  Copyright (c) 2010 German Cancer Research Center,
    Division of Medical and Biological Informatics

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

=============================================================================*/

#include "ctkVersion.h"

#include <stdexcept>

#include <QStringListIterator>
#include <QDebug>

namespace ctk {

  const QString Version::SEPARATOR = ".";
  const QRegExp Version::RegExp = QRegExp("[a-zA-Z0-9_\\-]*");

  const Version& Version::emptyVersion()
  {
    static Version emptyV;
    return emptyV;
  }

  Version& Version::operator=(const Version& v)
  {
    majorVersion = v.majorVersion;
    minorVersion = v.minorVersion;
    microVersion = v.microVersion;
    qualifier = v.qualifier;
    return *this;
  }

  Version::Version()
    : majorVersion(0), minorVersion(0), microVersion(0), qualifier("")
  {

  }


  void Version::validate()
  {
    if (!RegExp.exactMatch(qualifier))
      throw std::invalid_argument(std::string("invalid qualifier: ") + qualifier.toStdString());
  }

  Version::Version(unsigned int majorVersion, unsigned int minorVersion, unsigned int microVersion)
    : majorVersion(majorVersion), minorVersion(minorVersion), microVersion(microVersion), qualifier("")
  {

  }

  Version::Version(unsigned int majorVersion, unsigned int minorVersion, unsigned int microVersion, const QString& qualifier)
     : majorVersion(majorVersion), minorVersion(minorVersion), microVersion(microVersion), qualifier(qualifier)
  {
    this->validate();
  }

  Version::Version(const QString& version)
    : majorVersion(0), minorVersion(0), microVersion(0)
  {
    unsigned int maj = 0;
    unsigned int min = 0;
    unsigned int mic = 0;
    QString qual("");

    QStringList st = version.split(SEPARATOR);

    if (st.empty()) return;

    QStringListIterator i(st);

    bool ok = true;
    maj = i.next().toUInt(&ok);

    if (i.hasNext())
    {
      min = i.next().toUInt(&ok);
      if (i.hasNext())
      {
        mic = i.next().toUInt(&ok);
        if (i.hasNext())
        {
          qual = i.next();
          if (i.hasNext())
          {
             ok = false;
          }
        }
      }
    }

    if (!ok) throw std::invalid_argument("invalid format");

    majorVersion = maj;
    minorVersion = min;
    microVersion = mic;
    qualifier = qual;
    this->validate();
  }

  Version::Version(const Version& version)
  : majorVersion(version.majorVersion), minorVersion(version.minorVersion),
    microVersion(version.microVersion), qualifier(version.qualifier)
  {

  }

  Version Version::parseVersion(const QString& version)
  {
    if (version.isEmpty())
    {
      return emptyVersion();
    }

    QString version2 = version.trimmed();
    if (version2.isEmpty())
    {
      return emptyVersion();
    }

    return Version(version2);
  }

  unsigned int Version::getMajor() const
  {
    return majorVersion;
  }

  unsigned int Version::getMinor() const
  {
    return minorVersion;
  }

  unsigned int Version::getMicro() const
  {
    return microVersion;
  }

  QString Version::getQualifier() const
  {
    return qualifier;
  }

  QString Version::toString() const
  {
    QString result;
    result += QString::number(majorVersion) + SEPARATOR + QString::number(minorVersion) + SEPARATOR + QString::number(microVersion);
    if (!qualifier.isEmpty())
    {
      result += SEPARATOR + qualifier;
    }
    return result;
  }

  bool Version::operator==(const Version& other) const
  {
    if (&other == this)
    { // quicktest
      return true;
    }

    return (majorVersion == other.majorVersion) && (minorVersion == other.minorVersion) && (microVersion
        == other.microVersion) && qualifier == other.qualifier;
  }

  int Version::compare(const Version& other) const
  {
    if (&other == this)
    { // quicktest
      return 0;
    }

    if (majorVersion < other.majorVersion)
    {
      return -1;
    }

    if (majorVersion == other.majorVersion)
    {

      if (minorVersion < other.minorVersion)
      {
        return -1;
      }

      if (minorVersion == other.minorVersion)
      {

        if (microVersion < other.microVersion)
        {
          return -1;
        }

        if (microVersion == other.microVersion)
        {
          return qualifier.compare(other.qualifier);
        }
      }
    }
    return 1;
  }

}

QDebug operator<<(QDebug dbg, const ctk::Version& v)
{
  dbg << v.toString();

  return dbg.maybeSpace();
}