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#include "rewriter/user_dictionary_rewriter.h"

#include <cstddef>
#include <string>
#include <vector>

#include "base/logging.h"
#include "base/system_util.h"
#include "base/util.h"
#include "converter/segments.h"
#include "request/conversion_request.h"
#include "testing/base/public/googletest.h"
#include "testing/base/public/gunit.h"
#include "absl/flags/flag.h"

namespace mozc {

namespace {
void AddCandidate(const std::string &value, bool is_user_dictionary,
                  Segments *segments) {
  segments->set_request_type(Segments::CONVERSION);
  Segment *seg = nullptr;
  if (segments->segments_size() == 0) {
    seg = segments->push_back_segment();
    seg->set_key("test");
  } else {
    seg = segments->mutable_segment(0);
  }
  Segment::Candidate *candidate = seg->add_candidate();
  candidate->Init();
  candidate->key = value;
  candidate->content_key = value;
  candidate->value = value;
  candidate->content_value = value;
  if (is_user_dictionary) {
    candidate->attributes |= Segment::Candidate::USER_DICTIONARY;
  }
}

std::string GetCandidates(const Segments &segments) {
  CHECK_EQ(1, segments.segments_size());
  const Segment &seg = segments.segment(0);
  std::vector<std::string> results;
  for (size_t i = 0; i < seg.candidates_size(); ++i) {
    results.push_back(seg.candidate(i).value);
  }
  std::string result;
  Util::JoinStrings(results, " ", &result);
  return result;
}
}  // namespace

class UserDictionaryRewriterTest : public testing::Test {
 protected:
  UserDictionaryRewriterTest() {}
  ~UserDictionaryRewriterTest() override {}

  void SetUp() override {
    SystemUtil::SetUserProfileDirectory(absl::GetFlag(FLAGS_test_tmpdir));
  }

  void TearDown() override {}
};

TEST_F(UserDictionaryRewriterTest, RewriteTest) {
  UserDictionaryRewriter rewriter;
  const ConversionRequest request;

  {
    Segments segments;
    AddCandidate("1", false, &segments);
    AddCandidate("2", false, &segments);
    AddCandidate("3", false, &segments);
    AddCandidate("4", false, &segments);
    AddCandidate("5", false, &segments);
    EXPECT_FALSE(rewriter.Rewrite(request, &segments));
    EXPECT_EQ("1 2 3 4 5", GetCandidates(segments));
  }

  {
    Segments segments;
    AddCandidate("1", true, &segments);
    AddCandidate("2", false, &segments);
    AddCandidate("3", false, &segments);
    AddCandidate("4", false, &segments);
    AddCandidate("5", false, &segments);
    EXPECT_FALSE(rewriter.Rewrite(request, &segments));
    EXPECT_EQ("1 2 3 4 5", GetCandidates(segments));
  }

  {
    Segments segments;
    AddCandidate("1", false, &segments);
    AddCandidate("2", true, &segments);
    AddCandidate("3", false, &segments);
    AddCandidate("4", false, &segments);
    AddCandidate("5", false, &segments);
    EXPECT_FALSE(rewriter.Rewrite(request, &segments));
    EXPECT_EQ("1 2 3 4 5", GetCandidates(segments));
  }

  {
    Segments segments;
    AddCandidate("1", false, &segments);
    AddCandidate("2", false, &segments);
    AddCandidate("3", true, &segments);
    AddCandidate("4", false, &segments);
    AddCandidate("5", false, &segments);
    EXPECT_TRUE(rewriter.Rewrite(request, &segments));
    EXPECT_EQ("1 3 2 4 5", GetCandidates(segments));
  }
  {
    Segments segments;
    AddCandidate("1", false, &segments);
    AddCandidate("2", false, &segments);
    AddCandidate("3", true, &segments);
    AddCandidate("4", true, &segments);
    AddCandidate("5", false, &segments);
    EXPECT_TRUE(rewriter.Rewrite(request, &segments));
    EXPECT_EQ("1 3 4 2 5", GetCandidates(segments));
  }
  {
    Segments segments;
    AddCandidate("1", false, &segments);
    AddCandidate("2", true, &segments);
    AddCandidate("3", true, &segments);
    AddCandidate("4", true, &segments);
    AddCandidate("5", false, &segments);
    EXPECT_FALSE(rewriter.Rewrite(request, &segments));
    EXPECT_EQ("1 2 3 4 5", GetCandidates(segments));
  }
  {
    Segments segments;
    AddCandidate("1", true, &segments);
    AddCandidate("2", true, &segments);
    AddCandidate("3", true, &segments);
    AddCandidate("4", true, &segments);
    AddCandidate("5", true, &segments);
    EXPECT_FALSE(rewriter.Rewrite(request, &segments));
    EXPECT_EQ("1 2 3 4 5", GetCandidates(segments));
  }
  {
    Segments segments;
    AddCandidate("1", true, &segments);
    AddCandidate("2", false, &segments);
    AddCandidate("3", false, &segments);
    AddCandidate("4", true, &segments);
    AddCandidate("5", false, &segments);
    EXPECT_TRUE(rewriter.Rewrite(request, &segments));
    EXPECT_EQ("1 4 2 3 5", GetCandidates(segments));
  }
}
}  // namespace mozc
