#include <gtest/gtest.h>

#include <memory>
#include <string>
#include <vector>

#include "mocks/mock_alignment.h"
#include "mocks/mock_data_array.h"
#include "translation_table.h"

using namespace std;
using namespace ::testing;

namespace extractor {
namespace {

TEST(TranslationTableTest, TestScores) {
  vector<string> words = {"a", "b", "c"};

  vector<int> source_data = {2, 3, 2, 3, 4, 0, 2, 3, 6, 0, 2, 3, 6, 0};
  vector<int> source_sentence_start = {0, 6, 10, 14};
  shared_ptr<MockDataArray> source_data_array = make_shared<MockDataArray>();
  EXPECT_CALL(*source_data_array, GetData())
      .WillRepeatedly(ReturnRef(source_data));
  EXPECT_CALL(*source_data_array, GetNumSentences())
      .WillRepeatedly(Return(3));
  for (size_t i = 0; i < source_sentence_start.size(); ++i) {
    EXPECT_CALL(*source_data_array, GetSentenceStart(i))
        .WillRepeatedly(Return(source_sentence_start[i]));
  }
  for (size_t i = 0; i < words.size(); ++i) {
    EXPECT_CALL(*source_data_array, HasWord(words[i]))
        .WillRepeatedly(Return(true));
    EXPECT_CALL(*source_data_array, GetWordId(words[i]))
        .WillRepeatedly(Return(i + 2));
  }
  EXPECT_CALL(*source_data_array, HasWord("d"))
      .WillRepeatedly(Return(false));

  vector<int> target_data = {2, 3, 2, 3, 4, 5, 0, 3, 6, 0, 2, 7, 0};
  vector<int> target_sentence_start = {0, 7, 10, 13};
  shared_ptr<MockDataArray> target_data_array = make_shared<MockDataArray>();
  EXPECT_CALL(*target_data_array, GetData())
      .WillRepeatedly(ReturnRef(target_data));
  for (size_t i = 0; i < target_sentence_start.size(); ++i) {
    EXPECT_CALL(*target_data_array, GetSentenceStart(i))
        .WillRepeatedly(Return(target_sentence_start[i]));
  }
  for (size_t i = 0; i < words.size(); ++i) {
    EXPECT_CALL(*target_data_array, HasWord(words[i]))
        .WillRepeatedly(Return(true));
    EXPECT_CALL(*target_data_array, GetWordId(words[i]))
        .WillRepeatedly(Return(i + 2));
  }
  EXPECT_CALL(*target_data_array, HasWord("d"))
      .WillRepeatedly(Return(false));

  vector<pair<int, int> > links1 = {
    make_pair(0, 0), make_pair(1, 1), make_pair(2, 2), make_pair(3, 3),
    make_pair(4, 4), make_pair(4, 5)
  };
  vector<pair<int, int> > links2 = {make_pair(1, 0), make_pair(2, 1)};
  vector<pair<int, int> > links3 = {make_pair(0, 0), make_pair(2, 1)};
  shared_ptr<MockAlignment> alignment = make_shared<MockAlignment>();
  EXPECT_CALL(*alignment, GetLinks(0)).WillRepeatedly(Return(links1));
  EXPECT_CALL(*alignment, GetLinks(1)).WillRepeatedly(Return(links2));
  EXPECT_CALL(*alignment, GetLinks(2)).WillRepeatedly(Return(links3));

  shared_ptr<TranslationTable> table = make_shared<TranslationTable>(
      source_data_array, target_data_array, alignment);

  EXPECT_EQ(0.75, table->GetTargetGivenSourceScore("a", "a"));
  EXPECT_EQ(0, table->GetTargetGivenSourceScore("a", "b"));
  EXPECT_EQ(0.5, table->GetTargetGivenSourceScore("c", "c"));
  EXPECT_EQ(-1, table->GetTargetGivenSourceScore("c", "d"));

  EXPECT_EQ(1, table->GetSourceGivenTargetScore("a", "a"));
  EXPECT_EQ(0, table->GetSourceGivenTargetScore("a", "b"));
  EXPECT_EQ(1, table->GetSourceGivenTargetScore("c", "c"));
  EXPECT_EQ(-1, table->GetSourceGivenTargetScore("c", "d"));
}

} // namespace
} // namespace extractor