// Copyright 2010-2021, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "converter/connector.h"

#include <algorithm>
#include <cstdint>
#include <memory>
#include <random>
#include <string>
#include <vector>

#include "base/logging.h"
#include "base/mmap.h"
#include "data_manager/connection_file_reader.h"
#include "testing/base/public/gunit.h"
#include "testing/base/public/mozctest.h"
#include "absl/memory/memory.h"

namespace mozc {
namespace {

struct ConnectionDataEntry {
  uint16_t rid;
  uint16_t lid;
  int cost;
};

TEST(ConnectorTest, CompareWithRawData) {
  const std::string path = testing::GetSourceFileOrDie(
      {"data_manager", "testing", "connection.data"});
  Mmap cmmap;
  ASSERT_TRUE(cmmap.Open(path.c_str())) << "Failed to open image: " << path;
  auto status_or_connector =
      Connector::Create(cmmap.begin(), cmmap.size(), 256);
  ASSERT_TRUE(status_or_connector.ok()) << status_or_connector.status();
  auto connector = std::move(status_or_connector).value();
  ASSERT_EQ(1, connector->GetResolution());

  const std::string connection_text_path = testing::GetSourceFileOrDie(
      {"data_manager", "testing", "connection_single_column.txt"});
  std::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.
    std::random_device rd;
    std::mt19937 urbg(rd());
    std::shuffle(data.begin(), data.end(), urbg);
    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);
    }
  }
}

TEST(ConnectorTest, BrokenData) {
  const std::string path = testing::GetSourceFileOrDie(
      {"data_manager", "testing", "connection.data"});
  Mmap cmmap;
  ASSERT_TRUE(cmmap.Open(path.c_str())) << "Failed to open image: " << path;

  std::string data;

  // Invalid magic number.
  {
    data.assign(cmmap.begin(), cmmap.size());
    *reinterpret_cast<uint16_t *>(&data[0]) = 0;
    const auto status =
        Connector::Create(data.data(), data.size(), 256).status();
    VLOG(1) << status;
    EXPECT_FALSE(status.ok());
  }
  // Not square.
  {
    data.assign(cmmap.begin(), cmmap.size());
    uint16_t *array = reinterpret_cast<uint16_t *>(&data[0]);
    array[2] = 100;
    array[3] = 200;
    const auto status =
        Connector::Create(data.data(), data.size(), 256).status();
    VLOG(1) << status;
    EXPECT_FALSE(status.ok());
  }
  // Incomplete data.
  {
    data.assign(cmmap.begin(), cmmap.size());
    for (size_t divider : {2, 3, 5, 7, 10, 100, 1000}) {
      const auto size = data.size() / divider;
      const auto status = Connector::Create(data.data(), size, 256).status();
      VLOG(1) << "Divider=" << divider << ": " << status;
      EXPECT_FALSE(status.ok());
    }
  }
  // Not aligned at 32-bit bounary.
  {
    data.resize(cmmap.size() + 2);
    data.insert(2, cmmap.begin(), cmmap.size());  // Align at 16-bit boundary.
    const auto status =
        Connector::Create(data.data() + 2, cmmap.size(), 256).status();
    VLOG(1) << status;
    EXPECT_FALSE(status.ok());
  }
}

}  // namespace
}  // namespace mozc
