//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2026
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once

#include "td/utils/Slice.h"

namespace td {

class PathView {
 public:
  explicit PathView(Slice path);

  bool empty() const {
    return path_.empty();
  }

  bool is_dir() const {
    if (empty()) {
      return false;
    }
    return is_slash(path_.back());
  }

  Slice parent_dir() const {
    return path_.substr(0, last_slash_ + 1);
  }
  Slice parent_dir_noslash() const;

  Slice extension() const {
    if (last_dot_ == static_cast<int32>(path_.size())) {
      return Slice();
    }
    return path_.substr(last_dot_ + 1);
  }

  Slice without_extension() const {
    return path_.substr(0, last_dot_);
  }

  Slice file_stem() const {
    return path_.substr(last_slash_ + 1, last_dot_ - last_slash_ - 1);
  }

  Slice file_name() const {
    return path_.substr(last_slash_ + 1);
  }

  Slice file_name_without_extension() const {
    return path_.substr(last_slash_ + 1, last_dot_ - last_slash_ - 1);
  }

  Slice path() const {
    return path_;
  }

  bool is_absolute() const {
    return !empty() && (is_slash(path_[0]) || (path_.size() >= 3 && path_[1] == ':' && is_slash(path_[2])));
  }

  bool is_relative() const {
    return !is_absolute();
  }

  static Slice relative(Slice path, Slice dir, bool force = false);
  static Slice dir_and_file(Slice path);

 private:
  static bool is_slash(char c) {
    return c == '/' || c == '\\';
  }

  Slice path_;
  int32 last_slash_;
  int32 last_dot_;
};

}  // namespace td
