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#include <string>
#include <vector>
#include "base/file_stream.h"
#include "base/singleton.h"
#include "base/util.h"
#include "converter/connector.h"
#include "testing/base/public/gunit.h"

#ifdef MOZC_USE_SEPARATE_CONNECTION_DATA
#include "converter/connection_data_injected_environment.h"
namespace {
const ::testing::Environment *kConnectionDataInjectedEnvironment =
    ::testing::AddGlobalTestEnvironment(
        new ::mozc::ConnectionDataInjectedEnvironment());
}  // namespace
#endif  // MOZC_USE_SEPARATE_CONNECTION_DATA

DECLARE_string(test_srcdir);
DEFINE_string(connection_text_file, "data/dictionary/connection.txt",
              "Path to connection file.");

namespace mozc {

namespace {

bool ParseLine(const string &line, uint16 *rid, uint16 *lid, int *cost) {
  DCHECK(rid);
  DCHECK(lid);
  DCHECK(cost);
  vector<string> tokens;
  Util::SplitStringUsing(line, " ", &tokens);
  if (tokens.size() != 3) {
    return false;
  }

  *rid = atoi32(tokens[0].c_str());
  *lid = atoi32(tokens[1].c_str());
  *cost = atoi32(tokens[2].c_str());
  return true;
}

// Get actual file path for testing
string GetFilePath(const string &path) {
  return Util::JoinPath(FLAGS_test_srcdir, path);
}
}  // namespace

class ConnectorTest : public testing::Test {
 protected:
  ConnectorTest() : connector_(Singleton<Connector>::get()),
                    data_file_(GetFilePath(FLAGS_connection_text_file)) {}

  const Connector *connector_;
  const string data_file_;
};

TEST_F(ConnectorTest, RandomValueCheck) {
  InputFileStream ifs(data_file_.c_str());
  CHECK(ifs);
  string header_line;
  EXPECT_TRUE(getline(ifs, header_line));

  string line;
  const int resolution = connector_->GetResolution();
  while (getline(ifs, line)) {
    uint16 rid = 0, lid = 0;
    int cost = -1;
    // connection data have several millions of entries
    if (Util::Random(100000) != 0) {
      continue;
    }
    EXPECT_TRUE(ParseLine(line, &rid, &lid, &cost));
    EXPECT_GE(cost, 0);
    const int actual_cost = connector_->GetTransitionCost(rid, lid);
    if (cost == ConnectorInterface::kInvalidCost) {
      EXPECT_EQ(cost, actual_cost);
    } else {
      EXPECT_TRUE(cost == actual_cost ||
                  (cost - cost % resolution) == actual_cost)
          << "cost: " << cost << ", actual_cost: " << actual_cost;
    }
  }
}
}  // namespace mozc