/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2012-2014 University of California, Los Angeles
 *
 * This file is part of ChronoSync, synchronization library for distributed realtime
 * applications for NDN.
 *
 * ChronoSync is free software: you can redistribute it and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.
 *
 * ChronoSync is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * ChronoSync, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <boost/test/unit_test.hpp>
#include <boost/test/output_test_stream.hpp>
using boost::test_tools::output_test_stream;

#include "sync-digest.h"
#include <iostream>
#include <sstream>

using namespace Sync;
using namespace Sync::Error;
using namespace std;
using namespace boost;

BOOST_AUTO_TEST_SUITE(DigestTests)

BOOST_AUTO_TEST_CASE (BasicTest)
{
  Digest d0;
  BOOST_REQUIRE (d0.empty ());
}

BOOST_AUTO_TEST_CASE (DigestGenerationTest)
{
  Digest d1;
  BOOST_CHECK_NO_THROW (d1 << "1\n");

  // without explicit finalizing, Digest will not be complete and printing out will cause assert
  BOOST_CHECK (d1.empty ());

  // fix hash
  d1.finalize ();

  BOOST_CHECK_NO_THROW (d1.getHash ());
  BOOST_CHECK (!d1.empty ());
  BOOST_CHECK (d1 == d1);

  BOOST_CHECK_THROW (d1 << "2", DigestCalculationError);

  output_test_stream output;
  BOOST_CHECK_NO_THROW (output << d1);
  // BOOST_CHECK (output.check_length (40, false) );
  // BOOST_CHECK (output.is_equal ("e5fa44f2b31c1fb553b6021e7360d07d5d91ff5e", true)); // for sha1
	BOOST_CHECK (output.check_length (64, false) );
	BOOST_CHECK (output.is_equal ("4355a46b19d348dc2f57c046f8ef63d4538ebb936000f3c9ee954a27460dd865", true)); // for sha256
}

BOOST_AUTO_TEST_CASE (DigestComparison)
{
  Digest d1;
  BOOST_CHECK_NO_THROW (d1 << "1\n");
  // BOOST_CHECK_THROW (d1 == d1, DigestCalculationError);
  BOOST_CHECK_NO_THROW (d1.finalize ());
  BOOST_CHECK (d1 == d1);

  Digest d2;
  BOOST_CHECK_NO_THROW (d2 << "2\n");
  BOOST_CHECK_NO_THROW (d2.finalize ());
  BOOST_CHECK (d1 != d2);

  Digest d3;
  // istringstream is (string ("e5fa44f2b31c1fb553b6021e7360d07d5d91ff5e")); // real sha-1 for "1\n"
	istringstream is (string ("4355a46b19d348dc2f57c046f8ef63d4538ebb936000f3c9ee954a27460dd865")); // real sha256 for "1\n"
  BOOST_CHECK_NO_THROW (is >> d3);
  BOOST_CHECK (!d3.empty ());
  BOOST_CHECK (d3 == d1);
  BOOST_CHECK (d3 != d2);

  istringstream is2 (string ("25fa44f2b31c1fb553b6021e7360d07d5d91ff5e")); // some fake hash
  BOOST_CHECK_THROW (is2 >> d3, DigestCalculationError); // >> can be used only once

  Digest d4;
  BOOST_CHECK_THROW (is2 >> d4, DigestCalculationError); // is2 is now empty. empty >> is not allowed

  istringstream is3 (string ("25fa44f2b31c1fb553b6021e7360d07d5d91ff5e")); // some fake hash
  BOOST_CHECK_NO_THROW (is3 >> d4);

  BOOST_CHECK (d4 != d1);
  BOOST_CHECK (d4 != d2);
  BOOST_CHECK (d4 != d3);
}

BOOST_AUTO_TEST_SUITE_END()