#include <filesystem>

#include <gmock/gmock.h>

#include <jvalidate/enum.h>
#include <jvalidate/validation_result.h>
#include <jvalidate/validator.h>

using SchemaParams = std::tuple<jvalidate::schema::Version, std::filesystem::path>;

inline std::filesystem::path const & JSONSchemaTestSuiteDir() {
  static auto const g_root =
      std::filesystem::path(__FILE__).parent_path().parent_path().parent_path();
  static auto const g_path = g_root / "thirdparty" / "JSON-Schema-Test-Suite";
  return g_path;
}

inline std::string to_string(jvalidate::schema::Version version) {
  std::stringstream ss;
  ss << version;
  return ss.str();
}

inline auto SchemaTests(jvalidate::schema::Version version) {
  struct fs_iterator : std::filesystem::recursive_directory_iterator {
    using super = std::filesystem::recursive_directory_iterator;
    using value_type = SchemaParams;
    using reference = SchemaParams;

    fs_iterator() = default;
    explicit fs_iterator(jvalidate::schema::Version version)
        : super(JSONSchemaTestSuiteDir() / "tests" / to_string(version)), version(version) {}

    SchemaParams operator*() const { return std::make_tuple(version, super::operator*().path()); }

    fs_iterator operator++() {
      do {
        super::operator++();
      } while (*this != fs_iterator() && super::operator*().is_directory());
      return *this;
    }

    jvalidate::schema::Version version;
  };

  return testing::ValuesIn(fs_iterator(version), fs_iterator());
}

static auto SchemaTestName = [](auto const & info) {
  auto [version, file] = info.param;
  auto base = JSONSchemaTestSuiteDir() / "tests" / to_string(version);

  std::string name = std::filesystem::relative(file, base);
  name = name.substr(0, name.rfind('.'));
  std::transform(name.begin(), name.end(), name.begin(),
                 [](char c) { return std::isalnum(c) ? c : '_'; });
  return name;
};

MATCHER_P(ValidatesAgainst, schema, "") {
  jvalidate::ValidationResult result;
  bool valid = jvalidate::Validator(schema).validate(arg, &result);
  *result_listener << result;
  return valid;
}

template <typename T>
testing::Matcher<T> ValidatesAgainst(jvalidate::Schema const & schema, T const & test) {
  if (not jvalidate::adapter::AdapterFor<T const>(test)["valid"].as_boolean()) {
    return testing::Not(ValidatesAgainst(std::cref(schema)));
  }
  return ValidatesAgainst(std::cref(schema));
}