#include <string_view>

#include <gmock/gmock.h>
#include <gtest/gtest.h>

#include <jvalidate/adapter.h>
#include <jvalidate/adapters/jsoncpp.h>
#include <jvalidate/detail/pointer.h>
#include <jvalidate/enum.h>
#include <jvalidate/schema.h>
#include <jvalidate/status.h>
#include <jvalidate/uri.h>
#include <jvalidate/validation_result.h>
#include <jvalidate/validator.h>

#include <json/reader.h>
#include <json/value.h>

using enum jvalidate::schema::Version;
using testing::Not;

auto operator""_jptr(char const * data, size_t len) {
  return jvalidate::detail::Pointer(std::string_view{data, len});
}

Json::Value operator""_json(char const * data, size_t len) {
  Json::Value value;

  Json::CharReaderBuilder builder;
  std::unique_ptr<Json::CharReader> reader(builder.newCharReader());

  std::string error;
  if (not reader->parse(data, data + len, &value, &error)) {
    throw std::runtime_error(error);
  }

  return value;
}

auto validate(Json::Value const & schema_doc, Json::Value const & instance_doc,
              jvalidate::schema::Version version = Draft2020_12) {
  jvalidate::Schema const schema(schema_doc, version);

  jvalidate::ValidationResult result;
  (void)jvalidate::Validator(schema).validate(instance_doc, &result);

  return result;
}

MATCHER_P(HasAnnotationsFor, doc_path, "") { return arg.has(doc_path); }

MATCHER_P2(HasAnnotationAt, doc_path, schema_path, "") { return arg.has(doc_path, schema_path); }

MATCHER_P2(AnnotationAt, key, matcher, "") {
  auto const * anno = arg.annotation({}, {}, key);
  if (not anno) {
    return false;
  }
  return testing::ExplainMatchResult(matcher, *anno, result_listener);
}

MATCHER_P4(AnnotationAt, doc_path, schema_path, key, matcher, "") {
  auto const * anno = arg.annotation(doc_path, schema_path, key);
  if (not anno) {
    return false;
  }
  return testing::ExplainMatchResult(matcher, *anno, result_listener);
}

MATCHER_P2(ErrorAt, key, matcher, "") {
  auto const * anno = arg.error({}, {}, key);
  if (not anno) {
    return false;
  }
  return testing::ExplainMatchResult(matcher, *anno, result_listener);
}

MATCHER_P4(ErrorAt, doc_path, schema_path, key, matcher, "") {
  auto const * anno = arg.error(doc_path, schema_path, key);
  if (not anno) {
    return false;
  }
  return testing::ExplainMatchResult(matcher, *anno, result_listener);
}

TEST(Annotation, AttachesFormattingAnnotation) {
  auto const schema = R"({
    "format": "uri"
  })"_json;

  auto const instance = R"("http://json-schema.org")"_json;

  jvalidate::ValidationResult result = validate(schema, instance);

  EXPECT_THAT(result, AnnotationAt("format", "uri"));
}

TEST(Annotation, AnnotatesErrors) {
  auto const schema = R"({
    "minimum": 5
  })"_json;

  auto const instance = R"(4)"_json;

  jvalidate::ValidationResult result = validate(schema, instance);

  EXPECT_THAT(result, ErrorAt("minimum", "4 < 5"));
}

TEST(Annotation, DoesNotAnnotatesValid) {
  auto const schema = R"({
    "minimum": 5
  })"_json;

  auto const instance = R"(6)"_json;

  jvalidate::ValidationResult result = validate(schema, instance);

  EXPECT_THAT(result, Not(HasAnnotationsFor(""_jptr)));
}

TEST(Annotation, NotSchemaFlipsAnnotationRule) {
  auto const schema = R"({
    "not": { "minimum": 5 }
  })"_json;

  auto const instance = R"(6)"_json;

  jvalidate::ValidationResult result = validate(schema, instance);

  EXPECT_THAT(result, ErrorAt(""_jptr, "/not"_jptr, "minimum", "6 >= 5"));
}

TEST(Annotation, PathFollowsSchemaNotConstraintModel) {
  auto const schema = R"({
    "$comment": "disallow is implemented in the form of NotConstraint[TypeConstraint]",
    "disallow": "string"
  })"_json;

  auto const instance = R"("hello")"_json;

  jvalidate::ValidationResult result = validate(schema, instance, Draft03);

  EXPECT_THAT(result, ErrorAt("disallow", "string is in types [string]"));
}

TEST(Annotation, SomeConstraintsAnnotateBothValidAndInvalid) {
  auto const schema = R"({
    "$comment": "accepts any number <= 0 or >= 10",
    "oneOf": [
      { "minimum": 10 },
      { "maximum": 0 }
    ]
  })"_json;

  auto const instance = R"(-1)"_json;
  jvalidate::ValidationResult result = validate(schema, instance);

  EXPECT_THAT(result, Not(HasAnnotationAt(""_jptr, "/oneOf"_jptr)));
  EXPECT_THAT(result, ErrorAt(""_jptr, "/oneOf/0"_jptr, "minimum", "-1 < 10"));
  EXPECT_THAT(result, ErrorAt(""_jptr, "/oneOf/1"_jptr, "maximum", "-1 <= 0"));
}

TEST(Annotation, AttachesAlwaysFalseSensibly) {
  auto const schema = R"({
    "properties": {
      "A": false
    }
  })"_json;

  auto const instance = R"({
    "A": null
  })"_json;
  jvalidate::ValidationResult result = validate(schema, instance);

  EXPECT_THAT(result, ErrorAt("/A"_jptr, "/properties"_jptr, "", "always false"));
}

int main(int argc, char ** argv) {
  testing::InitGoogleMock(&argc, argv);
  return RUN_ALL_TESTS();
}