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#include <string>
#include "base/base.h"
#include "base/file_stream.h"
#include "base/mmap.h"
#include "base/util.h"
#include "converter/connector_interface.h"
#include "converter/sparse_connector.h"
#include "testing/base/public/gunit.h"

DECLARE_string(test_tmpdir);

namespace mozc {
namespace {
int GetFakeCost(int l, int r) {
  return (3 * l + r) * 1000;
}
}  // namespace

TEST(SparseConnectorTest, SparseConnecterOpenTest) {
  const string input_filename
      = mozc::Util::JoinPath(FLAGS_test_tmpdir, "connector.txt");

  const string output_filename
      = mozc::Util::JoinPath(FLAGS_test_tmpdir, "connector.db");

  {
    mozc::OutputFileStream ofs(input_filename.c_str());
    EXPECT_TRUE(ofs);

    ofs << "3 3" << endl;  // 3x3 matrix
    for (int i = 0; i < 3; ++i) {
      for (int j = 0; j < 3; ++j) {
        // lid, rid, cost
        ofs << i << " " << j << " " << GetFakeCost(i, j) << endl;
      }
    }
  }

  SparseConnectorBuilder::Compile(input_filename.c_str(),
                                  output_filename.c_str());

  Mmap<char> cmmap;
  CHECK(cmmap.Open(output_filename.c_str()))
      << "Failed to open matrix image" << output_filename;
  CHECK_GE(cmmap.Size(), 4) << "Malformed matrix image";
  scoped_ptr<SparseConnector> connector(
      new SparseConnector(cmmap.begin(), cmmap.GetFileSize()));

  const int cost_resolution = connector->GetResolution();
  for (int i = 0; i < 3; ++i) {
    for (int j = 0; j < 3; ++j) {
      const int diff = GetFakeCost(i, j) - connector->GetTransitionCost(i, j);
      EXPECT_LT(abs(diff), cost_resolution);
    }
  }
}

TEST(SparseConnectorTest, key_coding) {
  int key;
  key = SparseConnector::EncodeKey(0, 0);
  EXPECT_EQ(key, 0);

  key = SparseConnector::EncodeKey(0xaabb, 0xccdd);
  EXPECT_EQ(key, 0xccddaabb);
}
}  // namespace mozc