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

  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 "ctkVersionRange_p.h"

#include <stdexcept>

namespace ctk {

  const VersionRange& VersionRange::defaultVersionRange()
  {
    static VersionRange defaultVR;
    return defaultVR;
  }


  VersionRange::VersionRange(const QString& vr)
  {
    bool op = vr.startsWith("(");
    bool ob = vr.startsWith("[");

    if (op || ob) {
      bool cp = vr.endsWith(")");
      bool cb = vr.endsWith("]");
      int comma = vr.indexOf(',');

      if (comma > 0 && (cp || cb))
      {
        low = new Version(vr.mid(1, comma-1).trimmed());
        high = new Version(vr.mid(comma+1, vr.length()-comma-2).trimmed());
        lowIncluded = ob;
        highIncluded = cb;
      }
      else
      {
        throw std::invalid_argument("Illegal version range: " + vr.toStdString());
      }
    }
    else
    {
      low = new Version(vr);
      high = 0;
      lowIncluded = true;
      highIncluded = false;
    }
  }

  VersionRange::VersionRange()
  {
    low = new Version(Version::emptyVersion());
    high = 0;
    lowIncluded = true;
    highIncluded = false;
  }

  VersionRange::~VersionRange()
  {
    delete low;
    delete high;
  }

  bool VersionRange::isSpecified() const
  {
    return !(*this == defaultVersionRange());
  }

  bool VersionRange::withinRange(const Version& ver) const
  {
    if (*this == defaultVersionRange())
    {
      return true;
    }
    int c = low->compare(ver);

    if (c < 0 || (c == 0 && lowIncluded))
    {
      if (!high)
      {
        return true;
      }
      c = high->compare(ver);
      return c > 0 || (c == 0 && highIncluded);
    }
    return false;
  }

  bool VersionRange::withinRange(const VersionRange& range) const
  {
    if (*this == range) {
      return true;
    }
    int c = low->compare(*range.low);

    if (c < 0 || (c == 0 && lowIncluded == range.lowIncluded))
    {
      if (!high)
      {
        return true;
      }
      c = high->compare(*range.high);
      return c > 0 || (c == 0 && highIncluded == range.highIncluded);
    }
    return false;
  }

  int VersionRange::compare(const VersionRange& obj) const
  {
    return low->compare(*obj.low);
  }

  QString VersionRange::toString() const
  {
    if (high)
    {
      QString res;
      if (lowIncluded)
      {
        res += '[';
      }
      else
      {
        res += '(';
      }
      res += low->toString() + "," + high->toString();
      if (highIncluded)
      {
        res += ']';
      }
      else
      {
        res += ')';
      }
      return res;
    }
    else
    {
      return low->toString();
    }
  }

  bool VersionRange::operator==(const VersionRange& r) const
  {
    if (*low == *(r.low))
    {
      if (high)
      {
        return (*high == *(r.high))  &&
          (lowIncluded == r.lowIncluded) &&
          (highIncluded == r.highIncluded);
      }
      else
      {
        return true;
      }
    }
    return false;
  }

}