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#include "rewriter/version_rewriter.h"

#include <cstddef>
#include <string>
#include <utility>

#include "absl/strings/string_view.h"
#include "converter/candidate.h"
#include "converter/segments.h"
#include "protocol/commands.pb.h"
#include "request/conversion_request.h"
#include "rewriter/rewriter_interface.h"
#include "testing/gunit.h"
#include "testing/mozctest.h"

namespace mozc {
namespace {

constexpr absl::string_view kDummyDataVersion = "dataversion";

class VersionRewriterTest : public testing::TestWithTempUserProfile {
 protected:
  static void AddSegment(std::string key, std::string value,
                         Segments* segments) {
    Segment* segment = segments->push_back_segment();
    segment->set_key(key);
    AddCandidate(std::move(key), std::move(value), segment);
  }

  static void AddCandidate(std::string key, std::string value,
                           Segment* segment) {
    converter::Candidate* candidate = segment->add_candidate();
    candidate->value = value;
    candidate->content_value = std::move(value);
    candidate->content_key = std::move(key);
  }

  static bool FindCandidateWithPrefix(const absl::string_view prefix,
                                      const Segments& segments) {
    for (const Segment& segment : segments) {
      for (size_t j = 0; j < segment.candidates_size(); ++j) {
        if (segment.candidate(j).value.starts_with(prefix)) {
          return true;
        }
      }
    }
    return false;
  }
};

TEST_F(VersionRewriterTest, CapabilityTest) {
  // Default request.
  const ConversionRequest request;
  VersionRewriter rewriter(kDummyDataVersion);
  EXPECT_EQ(rewriter.capability(request), RewriterInterface::CONVERSION);
}

TEST_F(VersionRewriterTest, MobileEnvironmentTest) {
  commands::Request request;
  VersionRewriter rewriter(kDummyDataVersion);

  {
    request.set_mixed_conversion(true);
    const ConversionRequest convreq =
        ConversionRequestBuilder().SetRequest(request).Build();
    EXPECT_EQ(rewriter.capability(convreq), RewriterInterface::ALL);
  }

  {
    request.set_mixed_conversion(false);
    const ConversionRequest convreq =
        ConversionRequestBuilder().SetRequest(request).Build();
    EXPECT_EQ(rewriter.capability(convreq), RewriterInterface::CONVERSION);
  }
}


TEST_F(VersionRewriterTest, RewriteTestVersion) {
#ifdef GOOGLE_JAPANESE_INPUT_BUILD
  constexpr absl::string_view kVersionPrefixExpected = "GoogleJapaneseInput-";
  constexpr absl::string_view kVersionPrefixUnexpected = "Mozc-";
#else   // GOOGLE_JAPANESE_INPUT_BUILD
  constexpr absl::string_view kVersionPrefixExpected = "Mozc-";
  constexpr absl::string_view kVersionPrefixUnexpected = "GoogleJapaneseInput-";
#endif  // GOOGLE_JAPANESE_INPUT_BUILD

  VersionRewriter version_rewriter(kDummyDataVersion);

  const ConversionRequest request;
  {
    Segments segments;
    VersionRewriterTest::AddSegment("ばーじょん", "バージョン", &segments);

    EXPECT_TRUE(version_rewriter.Rewrite(request, &segments));
    EXPECT_TRUE(VersionRewriterTest::FindCandidateWithPrefix(
        kVersionPrefixExpected, segments));
    EXPECT_FALSE(VersionRewriterTest::FindCandidateWithPrefix(
        kVersionPrefixUnexpected, segments));
  }
  {
    Segments segments;
    VersionRewriterTest::AddSegment("Version", "Version", &segments);

    EXPECT_TRUE(version_rewriter.Rewrite(request, &segments));
    EXPECT_TRUE(VersionRewriterTest::FindCandidateWithPrefix(
        kVersionPrefixExpected, segments));
    EXPECT_FALSE(VersionRewriterTest::FindCandidateWithPrefix(
        kVersionPrefixUnexpected, segments));
  }
}

}  // namespace
}  // namespace mozc
