#include "common.hh"

#include "pathutil.hh"
#include "strutil.hh"

#include <vector>

namespace path {

std::string cleanup(std::string_view path) {
  auto trimmed_path = str::trim(path);
  bool trailing = !trimmed_path.empty() && trimmed_path.back() == '/';
  auto parts = str::split(trimmed_path, '/');
  auto it = parts.begin();
  while (it != parts.end()) {
    if (it->empty() || *it == ".") {
      if (it + 1 == parts.end())
        trailing = true;
      it = parts.erase(it);
    } else if (*it == "..") {
      if (it + 1 == parts.end())
        trailing = true;
      if (it > parts.begin()) {
        it = parts.erase(it - 1, it);
      } else {
        it = parts.erase(it);
      }
    } else {
      ++it;
    }
  }
  if (parts.empty())
    return "/";
  std::string ret;
  for (auto const& part : parts) {
    ret.push_back('/');
    ret.append(part);
  }
  if (trailing)
    ret.push_back('/');
  return ret;
}

}  // namespace path