/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
/***************************************************************************
 *            versionstr.cc
 *
 *  Wed Jul 22 11:41:32 CEST 2009
 *  Copyright 2009 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of DrumGizmo.
 *
 *  DrumGizmo 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.
 *
 *  DrumGizmo 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 DrumGizmo; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "versionstr.h"

#include <memory.h>
#include <stdlib.h>
#include <stdio.h>

// Workaround - major, minor and patch are defined as macros when using _GNU_SOURCES
#ifdef major
#undef major
#endif
#ifdef minor
#undef minor
#endif
#ifdef patch
#undef patch
#endif

VersionStr::VersionStr(std::string v) throw(const char *)
{
  memset(version, 0, sizeof(version));
  set(v);
}

VersionStr::VersionStr(size_t major, size_t minor, size_t patch)
{
  version[0] = major;
  version[1] = minor;
  version[2] = patch;
}

void VersionStr::set(std::string v) throw(const char *)
{
  std::string num;
  size_t idx = 0;
  for(size_t i = 0; i < v.length(); i++) {
    if(v[i] == '.') {
      if(idx > 2) throw "Version string is too long.";
      version[idx] = atoi(num.c_str());
      idx++;
      num = "";
    } else if(v[i] >= '0' && v[i] <= '9') {
      num.append(1, v[i]);
    } else {
      throw "Version string contains illegal character.";
    }
  }
  if(idx > 2) throw "Version string is too long.";
  version[idx] = atoi(num.c_str());
}

VersionStr::operator std::string() const
{
  std::string v;
  char *buf;
  size_t sz;
  if(patch()) sz = asprintf(&buf, "%d.%d.%d", major(), minor(), patch());
  else sz = asprintf(&buf, "%d.%d", major(), minor());
  if(sz) v = buf;
  free(buf);
  return v;
}
  
void VersionStr::operator=(std::string v) throw(const char *)
{
  set(v);
}

// return a - b simplified as -1, 0 or 1
static int vdiff(const VersionStr &a, const VersionStr &b)
{
  if(a.major() < b.major()) return -1;
  if(a.major() > b.major()) return 1;
  if(a.minor() < b.minor()) return -1;
  if(a.minor() > b.minor()) return 1;
  if(a.patch() < b.patch()) return -1;
  if(a.patch() > b.patch()) return 1;
  return 0;
}

bool VersionStr::operator<(const VersionStr &other) const
{
  if(vdiff(*this, other) == -1) return true;
  return false;
}

bool VersionStr::operator>(const VersionStr &other) const
{
  if(vdiff(*this, other) == 1) return true;
  return false;
}

bool VersionStr::operator==(const VersionStr &other) const
{
  if(vdiff(*this, other) == 0) return true;
  return false;
}

bool VersionStr::operator<=(const VersionStr &other) const
{
  if(vdiff(*this, other) != 1) return true;
  return false;
}

bool VersionStr::operator>=(const VersionStr &other) const
{
  if(vdiff(*this, other) != -1) return true;
  return false;
}

size_t VersionStr::major() const
{
  return version[0];
}

size_t VersionStr::minor() const
{
  return version[1];
}

size_t VersionStr::patch() const
{
  return version[2];
}