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#ifndef MOZC_TESTING_TESTING_UTIL_H_
#define MOZC_TESTING_TESTING_UTIL_H_

#include "absl/strings/string_view.h"
#include "base/protobuf/message.h"
#include "testing/gunit.h"

namespace mozc {
namespace testing {

// The following code is the implementation of EXPECT_PROTO_EQ and
// EXPECT_PROTO_PEQ (meaning EXPECT_PROTO_PARTIALLY_EQ),
// which compare given proto buffers with output appropriate message.
//
// How to use:
// You can pass the same type of proto buffer to EXPECT_PROTO_P?EQ, in
// "expect, actual" order. For convenience, the first argument of the macros,
// (i.e. expect), can take string literal. It'll be parsed appropriately.
// Assuming the proto P has members a and b;
//
// 1)
// P actual;
// ... (testing code) ...
// P expected;
// expected.set_a(expected_a);
// expected.set_b(expected_b);
// EXPECT_PROTO_EQ(expected, actual);
//
// 2)
// P actual;
// ... (testing code) ...
// EXPECT_PROTO_EQ("a: expected_a b: expected_b", actual);
//
// and so on. We can use EXPECT_PROTO_PEQ instead of EXPECT_PROTO_EQ.
// The difference between them is that EXPECT_PROTO_EQ compares all fields,
// but EXPECT_PROTO_PEQ checks only fields which is set in "expected".

namespace internal {
::testing::AssertionResult EqualsProtoFormat(
    absl::string_view expect_string, absl::string_view actual_string,
    const mozc::protobuf::Message& expect,
    const mozc::protobuf::Message& actual, bool is_partial);
}  // namespace internal

// Thin wrapper of EqualsProto to check if expect and actual has same type
// on compile time.
template <typename T>
::testing::AssertionResult EqualsProto(absl::string_view expect_string,
                                       absl::string_view actual_string,
                                       const T& expect, const T& actual) {
  return ::mozc::testing::internal::EqualsProtoFormat(
      expect_string, actual_string, expect, actual, false);
}

// To accept string constant, we also define a function taking
// absl::string_view.
::testing::AssertionResult EqualsProto(absl::string_view expect_string,
                                       absl::string_view actual_string,
                                       absl::string_view expect,
                                       const mozc::protobuf::Message& actual);

#define EXPECT_PROTO_EQ(expect, actual) \
  EXPECT_PRED_FORMAT2(::mozc::testing::EqualsProto, expect, actual)

// To accept string constant, we also define a function taking
// absl::string_view .
::testing::AssertionResult PartiallyEqualsProto(
    absl::string_view expect_string, absl::string_view actual_string,
    absl::string_view expect, const mozc::protobuf::Message& actual);

#define EXPECT_PROTO_PEQ(expect, actual) \
  EXPECT_PRED_FORMAT2(::mozc::testing::PartiallyEqualsProto, expect, actual)

}  // namespace testing
}  // namespace mozc

#endif  // MOZC_TESTING_TESTING_UTIL_H_
