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#include "base/version.h"
#include "base/util.h"

namespace mozc {
namespace version {

extern const char *kMozcVersion;
}  // namespace mozc::version

namespace {
class StringAsIntegerComparator {
 public:
  bool operator() (const string &lhs, const string &rhs) {
    return mozc::Util::SimpleAtoi(lhs) < mozc::Util::SimpleAtoi(rhs);
  }
};
}  // namespace

string Version::GetMozcVersion() {
  return version::kMozcVersion;
}

#ifdef OS_WINDOWS
wstring Version::GetMozcVersionW() {
  wstring version;
  mozc::Util::UTF8ToWide(version::kMozcVersion, &version);
  return version;
}
#endif

bool Version::CompareVersion(const string &lhs, const string &rhs) {
  if (lhs == rhs) {
    return false;
  }
  if (lhs.find("Unknown") != string::npos ||
      rhs.find("Unknown") != string::npos) {
    LOG(WARNING) << "Unknown is given as version";
    return false;
  }
  vector<string> vlhs;
  Util::SplitStringUsing(lhs, ".", &vlhs);
  vector<string> vrhs;
  Util::SplitStringUsing(rhs, ".", &vrhs);
  return lexicographical_compare(vlhs.begin(), vlhs.end(),
                                 vrhs.begin(), vrhs.end(),
                                 StringAsIntegerComparator());
}
}  // namespace mozc