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#include "rewriter/rewriter_util.h"

#include <string>

#include "absl/strings/str_format.h"
#include "absl/strings/string_view.h"
#include "converter/attribute.h"
#include "converter/candidate.h"
#include "converter/segments.h"
#include "testing/gunit.h"

namespace mozc {
namespace {

void AddCandidate(const absl::string_view key, const absl::string_view value,
                  Segment* segment) {
  converter::Candidate* candidate = segment->push_back_candidate();
  candidate->key = std::string(key);
  candidate->value = std::string(value);
}

TEST(RewriterUtilTest, CalculateInsertPositionTest_UserHistory) {
  Segment segment;
  for (int i = 0; i < 5; ++i) {
    AddCandidate(absl::StrFormat("key%d", i), absl::StrFormat("value%d", i),
                 &segment);
  }

  for (int i = 0; i < 3; ++i) {
    segment.mutable_candidate(i)->attributes =
        converter::Attribute::USER_HISTORY_PREDICTION;
  }

  EXPECT_EQ(RewriterUtil::CalculateInsertPosition(segment, 0), 3);
  EXPECT_EQ(RewriterUtil::CalculateInsertPosition(segment, 1), 4);
  EXPECT_EQ(RewriterUtil::CalculateInsertPosition(segment, 2), 5);
  EXPECT_EQ(RewriterUtil::CalculateInsertPosition(segment, 3), 5);
}

TEST(RewriterUtilTest, CalculateInsertPositionTest_NoUserHistory) {
  Segment segment;
  for (int i = 0; i < 5; ++i) {
    AddCandidate(absl::StrFormat("key%d", i), absl::StrFormat("value%d", i),
                 &segment);
  }

  EXPECT_EQ(RewriterUtil::CalculateInsertPosition(segment, 0), 0);
  EXPECT_EQ(RewriterUtil::CalculateInsertPosition(segment, 1), 1);
  EXPECT_EQ(RewriterUtil::CalculateInsertPosition(segment, 5), 5);
  EXPECT_EQ(RewriterUtil::CalculateInsertPosition(segment, 6), 5);
}

}  // namespace
}  // namespace mozc
