/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2014-2024,  The University of Memphis
 *
 * This file is part of PSync.
 * See AUTHORS.md for complete list of PSync authors and contributors.
 *
 * PSync is free software: you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 *
 * PSync 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * PSync, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 **/

#include "PSync/detail/iblt.hpp"
#include "PSync/detail/util.hpp"

#include "tests/boost-test.hpp"

namespace psync {
namespace detail {

using ndn::Name;

BOOST_AUTO_TEST_SUITE(TestIBLT)

BOOST_AUTO_TEST_CASE(Equal)
{
  const size_t size = 10;

  IBLT iblt1(size, CompressionScheme::DEFAULT);
  IBLT iblt2(size, CompressionScheme::DEFAULT);
  BOOST_CHECK_EQUAL(iblt1, iblt2);

  auto prefix = Name("/test/memphis").appendNumber(1);
  uint32_t newHash = murmurHash3(11, prefix);
  iblt1.insert(newHash);
  iblt2.insert(newHash);

  BOOST_CHECK_EQUAL(iblt1, iblt2);

  Name ibfName1("sync"), ibfName2("sync");
  iblt1.appendToName(ibfName1);
  iblt2.appendToName(ibfName2);
  BOOST_CHECK_EQUAL(ibfName1, ibfName2);
}

static const uint8_t IBF[] = {
  // Header
  0x08, 0xB4,
  // Uncompressed IBF
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x5C, 0x5B, 0xF2, 0x67,
  0x42, 0x24, 0xEE, 0x6C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x5C, 0x5B, 0xF2, 0x67,
  0x42, 0x24, 0xEE, 0x6C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
  0x5C, 0x5B, 0xF2, 0x67, 0x42, 0x24, 0xEE, 0x6C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00
};

BOOST_AUTO_TEST_CASE(NameAppendAndExtract)
{
  const int size = 10;

  IBLT iblt(size, CompressionScheme::DEFAULT);
  auto prefix = Name("/test/memphis").appendNumber(1);
  auto hash = murmurHash3(11, prefix);
  iblt.insert(hash);

  Name ibltName("/sync");
  iblt.appendToName(ibltName);

  IBLT rcvd(size, CompressionScheme::DEFAULT);
  rcvd.initialize(ibltName.at(-1));
  BOOST_CHECK_EQUAL(iblt, rcvd);

  IBLT rcvdDiffSize(20, CompressionScheme::DEFAULT);
  BOOST_CHECK_THROW(rcvdDiffSize.initialize(ibltName.at(-1)), IBLT::Error);

  IBLT iblt2(size, CompressionScheme::NONE);
  iblt2.insert(hash);
  Name ibltName2("/sync");
  iblt2.appendToName(ibltName2);
  BOOST_TEST(ibltName2.at(-1).wireEncode() == IBF, boost::test_tools::per_element());

  Name malformedName("/test");
  auto compressed = compress(CompressionScheme::DEFAULT,
                             malformedName.wireEncode().value_bytes());
  malformedName.append(Name::Component(std::move(compressed)));
  IBLT rcvd2(size, CompressionScheme::DEFAULT);
  BOOST_CHECK_THROW(rcvd2.initialize(malformedName.at(-1)), IBLT::Error);
}

BOOST_AUTO_TEST_CASE(CopyInsertErase)
{
  const size_t size = 10;

  IBLT iblt1(size, CompressionScheme::DEFAULT);

  auto prefix = Name("/test/memphis").appendNumber(1);
  uint32_t hash1 = murmurHash3(11, prefix);
  iblt1.insert(hash1);

  IBLT iblt2(iblt1);
  iblt2.erase(hash1);
  prefix = Name("/test/memphis").appendNumber(2);
  uint32_t hash3 = murmurHash3(11, prefix);
  iblt2.insert(hash3);

  iblt1.erase(hash1);
  prefix = Name("/test/memphis").appendNumber(5);
  uint32_t hash5 = murmurHash3(11, prefix);
  iblt1.insert(hash5);

  iblt2.erase(hash3);
  iblt2.insert(hash5);

  BOOST_CHECK_EQUAL(iblt1, iblt2);
}

BOOST_AUTO_TEST_CASE(HigherSeqTest)
{
  // The case where we can't recognize if the rcvd IBF has higher sequence number
  // Relevant to full sync case

  const size_t size = 10;

  IBLT ownIBF(size, CompressionScheme::DEFAULT);
  IBLT rcvdIBF(size, CompressionScheme::DEFAULT);

  auto prefix = Name("/test/memphis").appendNumber(3);
  uint32_t hash1 = murmurHash3(11, prefix);
  ownIBF.insert(hash1);

  auto prefix2 = Name("/test/memphis").appendNumber(4);
  uint32_t hash2 = murmurHash3(11, prefix2);
  rcvdIBF.insert(hash2);

  auto diff = ownIBF - rcvdIBF;
  BOOST_CHECK(diff.canDecode);
  BOOST_CHECK(*diff.positive.begin() == hash1);
  BOOST_CHECK(*diff.negative.begin() == hash2);
}

BOOST_AUTO_TEST_CASE(Difference)
{
  const size_t size = 10;

  IBLT ownIBF(size, CompressionScheme::DEFAULT);
  IBLT rcvdIBF = ownIBF;

  auto diff = ownIBF - rcvdIBF;
  // non-empty Positive means we have some elements that the others don't

  BOOST_CHECK(diff.canDecode);
  BOOST_CHECK_EQUAL(diff.positive.size(), 0);
  BOOST_CHECK_EQUAL(diff.negative.size(), 0);

  auto prefix = Name("/test/memphis").appendNumber(1);
  uint32_t newHash = murmurHash3(11, prefix);
  ownIBF.insert(newHash);

  diff = ownIBF - rcvdIBF;
  BOOST_CHECK(diff.canDecode);
  BOOST_CHECK_EQUAL(diff.positive.size(), 1);
  BOOST_CHECK_EQUAL(diff.negative.size(), 0);

  prefix = Name("/test/csu").appendNumber(1);
  newHash = murmurHash3(11, prefix);
  rcvdIBF.insert(newHash);

  diff = ownIBF - rcvdIBF;
  BOOST_CHECK(diff.canDecode);
  BOOST_CHECK_EQUAL(diff.positive.size(), 1);
  BOOST_CHECK_EQUAL(diff.negative.size(), 1);
}

BOOST_AUTO_TEST_CASE(DifferenceBwOversizedIBFs)
{
  // Insert 50 elements into IBF of size 10
  // Check that we can still list the difference
  // even though we can't list the IBFs itself

  const size_t size = 10;

  IBLT ownIBF(size, CompressionScheme::DEFAULT);

  for (int i = 0; i < 50; i++) {
    auto prefix = Name("/test/memphis" + std::to_string(i)).appendNumber(1);
    uint32_t newHash = murmurHash3(11, prefix);
    ownIBF.insert(newHash);
  }

  IBLT rcvdIBF = ownIBF;

  auto prefix = Name("/test/ucla").appendNumber(1);
  uint32_t newHash = murmurHash3(11, prefix);
  ownIBF.insert(newHash);

  auto diff = ownIBF - rcvdIBF;
  BOOST_CHECK(diff.canDecode);
  BOOST_CHECK_EQUAL(diff.positive.size(), 1);
  BOOST_CHECK_EQUAL(*diff.positive.begin(), newHash);
  BOOST_CHECK_EQUAL(diff.negative.size(), 0);

  IBLT emptyIBF(size, CompressionScheme::DEFAULT);
  BOOST_CHECK(!(ownIBF - emptyIBF).canDecode);
  BOOST_CHECK(!(rcvdIBF - emptyIBF).canDecode);
}

BOOST_AUTO_TEST_SUITE_END()

} // namespace detail
} // namespace psync