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#include "converter/connector.h"

#include <algorithm>
#include <string>
#include <vector>

#include "base/file_util.h"
#include "base/mmap.h"
#include "base/scoped_ptr.h"
#include "data_manager/connection_file_reader.h"
#include "testing/base/public/gunit.h"

DECLARE_string(test_srcdir);

namespace mozc {
namespace {

const char kTestConnectionDataImagePath[] =
    "data_manager/testing/connection_data.data";
const char kTestConnectionFilePath[] =
    "data_manager/testing/connection_single_column.txt";

struct ConnectionDataEntry {
  uint16 rid;
  uint16 lid;
  int cost;
};

TEST(ConnectorTest, CompareWithRawData) {
  const string path = FileUtil::JoinPath(
      FLAGS_test_srcdir, kTestConnectionDataImagePath);
  Mmap cmmap;
  ASSERT_TRUE(cmmap.Open(path.c_str())) << "Failed to open image: " << path;
  scoped_ptr<Connector> connector(
      new Connector(cmmap.begin(), cmmap.size(), 256));
  ASSERT_EQ(1, connector->GetResolution());

  const string connection_text_path =
      FileUtil::JoinPath(FLAGS_test_srcdir, kTestConnectionFilePath);
  vector<ConnectionDataEntry> data;
  for (ConnectionFileReader reader(connection_text_path);
       !reader.done(); reader.Next()) {
    ConnectionDataEntry entry;
    entry.rid = reader.rid_of_left_node();
    entry.lid = reader.lid_of_right_node();
    entry.cost = reader.cost();
    data.push_back(entry);
  }

  for (int trial = 0; trial < 3; ++trial) {
    // Lookup in random order for a few times.
    random_shuffle(data.begin(), data.end());
    for (size_t i = 0; i < data.size(); ++i) {
      int actual = connector->GetTransitionCost(data[i].rid, data[i].lid);
      EXPECT_EQ(data[i].cost, actual);

      // Cache hit case.
      actual = connector->GetTransitionCost(data[i].rid, data[i].lid);
      EXPECT_EQ(data[i].cost, actual);
    }
  }
}

}  // namespace
}  // namespace mozc