// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "util/json/json_helpers.h"

#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "util/chrono_helpers.h"

namespace openscreen {
namespace json {
namespace {

using ::testing::ElementsAre;

const Json::Value kNone;
const Json::Value kEmptyString = "";
const Json::Value kEmptyArray(Json::arrayValue);

struct Dummy {
  int value;

  constexpr bool operator==(const Dummy& other) const {
    return other.value == value;
  }
};

bool ParseAndValidateDummy(const Json::Value& value, Dummy* out) {
  int value_out;
  if (!ParseAndValidateInt(value, &value_out)) {
    return false;
  }
  *out = Dummy{value_out};
  return true;
}

}  // namespace

TEST(ParsingHelpersTest, ParseAndValidateDouble) {
  const Json::Value kValid = 13.37;
  const Json::Value kNotDouble = "coffee beans";
  const Json::Value kNegativeDouble = -4.2;
  const Json::Value kZeroDouble = 0.0;
  const Json::Value kNanDouble = std::nan("");

  double out;
  EXPECT_TRUE(ParseAndValidateDouble(kValid, &out));
  EXPECT_DOUBLE_EQ(13.37, out);
  EXPECT_TRUE(ParseAndValidateDouble(kZeroDouble, &out));
  EXPECT_DOUBLE_EQ(0.0, out);
  EXPECT_FALSE(ParseAndValidateDouble(kNotDouble, &out));
  EXPECT_FALSE(ParseAndValidateDouble(kNegativeDouble, &out));
  EXPECT_FALSE(ParseAndValidateDouble(kNone, &out));
  EXPECT_FALSE(ParseAndValidateDouble(kNanDouble, &out));
}

TEST(ParsingHelpersTest, ParseAndValidateInt) {
  const Json::Value kValid = 1337;
  const Json::Value kNotInt = "cold brew";
  const Json::Value kNegativeInt = -42;
  const Json::Value kZeroInt = 0;

  int out;
  EXPECT_TRUE(ParseAndValidateInt(kValid, &out));
  EXPECT_EQ(1337, out);
  EXPECT_TRUE(ParseAndValidateInt(kZeroInt, &out));
  EXPECT_EQ(0, out);
  EXPECT_FALSE(ParseAndValidateInt(kNone, &out));
  EXPECT_FALSE(ParseAndValidateInt(kNotInt, &out));
  EXPECT_FALSE(ParseAndValidateInt(kNegativeInt, &out));
}

TEST(ParsingHelpersTest, ParseAndValidateUint) {
  const Json::Value kValid = 1337u;
  const Json::Value kNotUint = "espresso";
  const Json::Value kZeroUint = 0u;

  uint32_t out;
  EXPECT_TRUE(ParseAndValidateUint(kValid, &out));
  EXPECT_EQ(1337u, out);
  EXPECT_TRUE(ParseAndValidateUint(kZeroUint, &out));
  EXPECT_EQ(0u, out);
  EXPECT_FALSE(ParseAndValidateUint(kNone, &out));
  EXPECT_FALSE(ParseAndValidateUint(kNotUint, &out));
}

TEST(ParsingHelpersTest, ParseAndValidateString) {
  const Json::Value kValid = "macchiato";
  const Json::Value kNotString = 42;

  std::string out;
  EXPECT_TRUE(ParseAndValidateString(kValid, &out));
  EXPECT_EQ("macchiato", out);
  EXPECT_TRUE(ParseAndValidateString(kEmptyString, &out));
  EXPECT_EQ("", out);
  EXPECT_FALSE(ParseAndValidateString(kNone, &out));
  EXPECT_FALSE(ParseAndValidateString(kNotString, &out));
}

// Simple fraction validity is tested extensively in its unit tests, so we
// just check the major cases here.
TEST(ParsingHelpersTest, ParseAndValidateSimpleFraction) {
  const Json::Value kValid = "42/30";
  const Json::Value kValidNumber = "42";
  const Json::Value kUndefined = "5/0";
  const Json::Value kNegative = "10/-2";
  const Json::Value kInvalidNumber = "-1";
  const Json::Value kNotSimpleFraction = "latte";
  const Json::Value kInteger = 123;
  const Json::Value kNegativeInteger = -5000;

  SimpleFraction out;
  EXPECT_TRUE(ParseAndValidateSimpleFraction(kValid, &out));
  EXPECT_EQ((SimpleFraction{42, 30}), out);
  EXPECT_TRUE(ParseAndValidateSimpleFraction(kValidNumber, &out));
  EXPECT_EQ((SimpleFraction{42, 1}), out);
  EXPECT_TRUE(ParseAndValidateSimpleFraction(kInteger, &out));
  EXPECT_EQ((SimpleFraction{123, 1}), out);
  EXPECT_FALSE(ParseAndValidateSimpleFraction(kUndefined, &out));
  EXPECT_FALSE(ParseAndValidateSimpleFraction(kNegative, &out));
  EXPECT_FALSE(ParseAndValidateSimpleFraction(kInvalidNumber, &out));
  EXPECT_FALSE(ParseAndValidateSimpleFraction(kNotSimpleFraction, &out));
  EXPECT_FALSE(ParseAndValidateSimpleFraction(kNone, &out));
  EXPECT_FALSE(ParseAndValidateSimpleFraction(kEmptyString, &out));
  EXPECT_FALSE(ParseAndValidateSimpleFraction(kNegativeInteger, &out));
}

TEST(ParsingHelpersTest, ParseAndValidateMilliseconds) {
  const Json::Value kValid = 1000;
  const Json::Value kValidFloat = 500.0;
  const Json::Value kNegativeNumber = -120;
  const Json::Value kZeroNumber = 0;
  const Json::Value kNotNumber = "affogato";

  milliseconds out;
  EXPECT_TRUE(ParseAndValidateMilliseconds(kValid, &out));
  EXPECT_EQ(milliseconds(1000), out);
  EXPECT_TRUE(ParseAndValidateMilliseconds(kValidFloat, &out));
  EXPECT_EQ(milliseconds(500), out);
  EXPECT_TRUE(ParseAndValidateMilliseconds(kZeroNumber, &out));
  EXPECT_EQ(milliseconds(0), out);
  EXPECT_FALSE(ParseAndValidateMilliseconds(kNone, &out));
  EXPECT_FALSE(ParseAndValidateMilliseconds(kNegativeNumber, &out));
  EXPECT_FALSE(ParseAndValidateMilliseconds(kNotNumber, &out));
}

TEST(ParsingHelpersTest, ParseAndValidateArray) {
  Json::Value valid_dummy_array;
  valid_dummy_array[0] = 123;
  valid_dummy_array[1] = 456;

  Json::Value invalid_dummy_array;
  invalid_dummy_array[0] = "iced coffee";
  invalid_dummy_array[1] = 456;

  std::vector<Dummy> out;
  EXPECT_TRUE(ParseAndValidateArray<Dummy>(valid_dummy_array,
                                           ParseAndValidateDummy, &out));
  EXPECT_THAT(out, ElementsAre(Dummy{123}, Dummy{456}));
  EXPECT_FALSE(ParseAndValidateArray<Dummy>(invalid_dummy_array,
                                            ParseAndValidateDummy, &out));
  EXPECT_FALSE(
      ParseAndValidateArray<Dummy>(kEmptyArray, ParseAndValidateDummy, &out));
}

TEST(ParsingHelpersTest, ParseAndValidateIntArray) {
  Json::Value valid_int_array;
  valid_int_array[0] = 123;
  valid_int_array[1] = 456;

  Json::Value invalid_int_array;
  invalid_int_array[0] = "iced coffee";
  invalid_int_array[1] = 456;

  std::vector<int> out;
  EXPECT_TRUE(ParseAndValidateIntArray(valid_int_array, &out));
  EXPECT_THAT(out, ElementsAre(123, 456));
  EXPECT_FALSE(ParseAndValidateIntArray(invalid_int_array, &out));
  EXPECT_FALSE(ParseAndValidateIntArray(kEmptyArray, &out));
}

TEST(ParsingHelpersTest, ParseAndValidateUintArray) {
  Json::Value valid_uint_array;
  valid_uint_array[0] = 123u;
  valid_uint_array[1] = 456u;

  Json::Value invalid_uint_array;
  invalid_uint_array[0] = "breve";
  invalid_uint_array[1] = 456u;

  std::vector<uint32_t> out;
  EXPECT_TRUE(ParseAndValidateUintArray(valid_uint_array, &out));
  EXPECT_THAT(out, ElementsAre(123u, 456u));
  EXPECT_FALSE(ParseAndValidateUintArray(invalid_uint_array, &out));
  EXPECT_FALSE(ParseAndValidateUintArray(kEmptyArray, &out));
}

TEST(ParsingHelpersTest, ParseAndValidateStringArray) {
  Json::Value valid_string_array;
  valid_string_array[0] = "nitro cold brew";
  valid_string_array[1] = "doppio espresso";

  Json::Value invalid_string_array;
  invalid_string_array[0] = "mocha latte";
  invalid_string_array[1] = 456;

  std::vector<std::string> out;
  EXPECT_TRUE(ParseAndValidateStringArray(valid_string_array, &out));
  EXPECT_THAT(out, ElementsAre("nitro cold brew", "doppio espresso"));
  EXPECT_FALSE(ParseAndValidateStringArray(invalid_string_array, &out));
  EXPECT_FALSE(ParseAndValidateStringArray(kEmptyArray, &out));
}

}  // namespace json
}  // namespace openscreen