/* vim:set ts=2 sw=2 sts=2 et: */
/**
 * \author     Marcus Holland-Moritz (github@mhxnet.de)
 * \copyright  Copyright (c) Marcus Holland-Moritz
 *
 * This file is part of dwarfs.
 *
 * dwarfs 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 3 of the License, or
 * (at your option) any later version.
 *
 * dwarfs 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 dwarfs.  If not, see <https://www.gnu.org/licenses/>.
 */

#pragma once

#include <filesystem>
#include <functional>
#include <map>
#include <memory>
#include <optional>
#include <span>
#include <string>
#include <string_view>
#include <unordered_set>
#include <variant>
#include <vector>

#include "dwarfs/os_access.h"
#include "dwarfs/script.h"

struct stat;

namespace dwarfs::test {

class os_access_mock : public os_access {
 public:
  os_access_mock();
  ~os_access_mock();

  static std::shared_ptr<os_access_mock> create_test_instance();

  size_t size() const;

  void add(std::filesystem::path const& path, struct ::stat const& st);
  void add(std::filesystem::path const& path, struct ::stat const& st,
           std::string const& contents);
  void add(std::filesystem::path const& path, struct ::stat const& st,
           std::function<std::string()> generator);

  void add_dir(std::filesystem::path const& path);
  void add_file(std::filesystem::path const& path, size_t size);
  void add_file(std::filesystem::path const& path, std::string const& contents);

  void set_access_fail(std::filesystem::path const& path);

  std::shared_ptr<dir_reader> opendir(const std::string& path) const override;

  void lstat(const std::string& path, struct ::stat* st) const override;

  std::string readlink(const std::string& path, size_t size) const override;

  std::shared_ptr<mmif>
  map_file(const std::string& path, size_t size) const override;

  int access(const std::string&, int) const override;

 private:
  struct mock_directory;
  struct mock_dirent;

  static std::vector<std::string> splitpath(std::filesystem::path const& path);
  struct mock_dirent* find(std::filesystem::path const& path) const;
  struct mock_dirent* find(std::vector<std::string> parts) const;
  void add_internal(
      std::filesystem::path const& path, struct ::stat const& st,
      std::variant<std::monostate, std::string, std::function<std::string()>,
                   std::unique_ptr<mock_directory>>
          var);

  std::unique_ptr<mock_dirent> root_;
  size_t ino_{1000000};
  std::unordered_set<std::string> access_fail_set_;
};

class script_mock : public script {
 public:
  bool has_configure() const override { return true; }
  bool has_filter() const override { return true; }
  bool has_transform() const override { return true; }
  bool has_order() const override { return true; }

  void configure(options_interface const& /*oi*/) override {}

  bool filter(entry_interface const& /*ei*/) override { return true; }

  void transform(entry_interface& /*ei*/) override {
    // do nothing
  }

  void order(inode_vector& /*iv*/) override {
    // do nothing
  }
};

struct simplestat {
  ::ino_t st_ino;
  ::mode_t st_mode;
  ::nlink_t st_nlink;
  ::uid_t st_uid;
  ::gid_t st_gid;
  ::off_t st_size;
  ::dev_t st_rdev;
  uint64_t atime;
  uint64_t mtime;
  uint64_t ctime;
};

extern std::map<std::string, simplestat> statmap;

std::optional<std::filesystem::path> find_binary(std::string_view name);

std::span<std::pair<simplestat, std::string_view> const> test_dirtree();

} // namespace dwarfs::test