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#include "rewriter/user_dictionary_rewriter.h"

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

#include "absl/log/check.h"
#include "absl/strings/str_join.h"
#include "absl/strings/string_view.h"
#include "converter/attribute.h"
#include "converter/candidate.h"
#include "converter/segments.h"
#include "request/conversion_request.h"
#include "testing/gunit.h"
#include "testing/mozctest.h"

namespace mozc {
namespace {

void AddCandidate(std::string value, const bool is_user_dictionary,
                  Segments* segments) {
  Segment* seg = nullptr;
  if (segments->segments_size() == 0) {
    seg = segments->push_back_segment();
    seg->set_key("test");
  } else {
    seg = segments->mutable_segment(0);
  }
  converter::Candidate* candidate = seg->add_candidate();
  candidate->key = value;
  candidate->content_key = value;
  candidate->value = value;
  candidate->content_value = std::move(value);
  if (is_user_dictionary) {
    candidate->attributes |= converter::Attribute::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);
  }
  return absl::StrJoin(results, " ");
}

class UserDictionaryRewriterTest : public testing::TestWithTempUserProfile {};

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(GetCandidates(segments), "1 2 3 4 5");
  }

  {
    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(GetCandidates(segments), "1 2 3 4 5");
  }

  {
    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(GetCandidates(segments), "1 2 3 4 5");
  }

  {
    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(GetCandidates(segments), "1 3 2 4 5");
  }
  {
    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(GetCandidates(segments), "1 3 4 2 5");
  }
  {
    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(GetCandidates(segments), "1 2 3 4 5");
  }
  {
    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(GetCandidates(segments), "1 2 3 4 5");
  }
  {
    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(GetCandidates(segments), "1 4 2 3 5");
  }
}

}  // namespace
}  // namespace mozc
