/* Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program 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, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#include <gtest/gtest.h>
#include <sys/types.h>
#include <vector>

#include "my_inttypes.h"
#include "sql/merge_sort.h"
#include "sql/sql_select.h"
#include "unittest/gunit/test_utils.h"

namespace join_tab_sort_unittest {

using my_testing::Mock_error_handler;
using my_testing::Server_initializer;

class JTSortTest : public ::testing::Test {
 protected:
  virtual void SetUp() { initializer.SetUp(); }
  virtual void TearDown() { initializer.TearDown(); }

  Server_initializer initializer;
};

class MOCK_JOIN_TAB : public JOIN_TAB {
 public:
  MOCK_JOIN_TAB(uint recs, uint table_no) : JOIN_TAB() {
    found_records = recs;
    set_qs(&m_shared);
    this->set_table(&m_table);
    m_table_list.set_tableno(table_no);
    this->table_ref = &m_table_list;
  }

  TABLE m_table;
  TABLE_LIST m_table_list;
  QEP_shared m_shared;
};

std::ostream &operator<<(std::ostream &s, const MOCK_JOIN_TAB &jt) {
  return s << "{" << jt.found_records << ", " << jt.m_table_list.map() << "}";
}

TEST_F(JTSortTest, SimpleSortTest) {
  MOCK_JOIN_TAB jt1(UINT_MAX, 0);
  MOCK_JOIN_TAB jt2(2, 0);
  MOCK_JOIN_TAB jt3(1, 0);
  MOCK_JOIN_TAB jt4(10, 0);
  MOCK_JOIN_TAB jt5(5, 0);

  MOCK_JOIN_TAB *arr[5];
  arr[0] = &jt1;
  arr[1] = &jt2;
  arr[2] = &jt3;
  arr[3] = &jt4;
  arr[4] = &jt5;

  insert_sort(arr, arr + 5, Join_tab_compare_default());

  EXPECT_EQ(1U, arr[0]->found_records);
  EXPECT_EQ(2U, arr[1]->found_records);
  EXPECT_EQ(5U, arr[2]->found_records);
  EXPECT_EQ(10U, arr[3]->found_records);
  EXPECT_EQ(UINT_MAX, arr[4]->found_records);
}

TEST_F(JTSortTest, SortFoundRecordsTest) {
  const int num_tables = 50;
  MOCK_JOIN_TAB *arr[num_tables];

  for (int i = 0; i < num_tables; i++)
    arr[i] = new (*THR_MALLOC) MOCK_JOIN_TAB(i, 0);

  // MERGE SORT
  std::random_shuffle(arr, arr + 50);
  merge_sort(arr, arr + num_tables, Join_tab_compare_default());
  for (int i = 1; i < num_tables; i++)
    EXPECT_TRUE(arr[i]->found_records > arr[i - 1]->found_records);

  // INSERT SORT
  std::random_shuffle(arr, arr + 50);
  insert_sort(arr, arr + num_tables, Join_tab_compare_default());
  for (int i = 1; i < num_tables; i++)
    EXPECT_TRUE(arr[i]->found_records > arr[i - 1]->found_records);

  for (int i = 0; i < num_tables; i++) {
    destroy(arr[i]);
  }
}

TEST_F(JTSortTest, SortDependsTest) {
  const int num_tables = 50;
  MOCK_JOIN_TAB *arr[num_tables];

  /*
    dependency has higher precedence than found_records, so the tables
    shall be ordered with decreasing number of records in this test
  */
  for (int i = 0; i < num_tables; i++) {
    arr[i] = new (*THR_MALLOC) MOCK_JOIN_TAB(i, i);
    for (int j = i + 1; j < num_tables; j++) arr[i]->dependent |= 1ULL << j;
  }

  // MERGE SORT
  std::random_shuffle(arr, arr + num_tables);
  merge_sort(arr, arr + num_tables, Join_tab_compare_default());
  for (int i = 1; i < num_tables; i++)
    EXPECT_TRUE(arr[i]->found_records < arr[i - 1]->found_records)
        << "i: " << *(arr[i]) << " "
        << "i-1: " << *(arr[i - 1]);

  // INSERT SORT
  std::random_shuffle(arr, arr + num_tables);
  insert_sort(arr, arr + num_tables, Join_tab_compare_default());
  for (int i = 1; i < num_tables; i++)
    EXPECT_TRUE(arr[i]->found_records < arr[i - 1]->found_records);

  for (int i = 0; i < num_tables; i++) {
    destroy(arr[i]);
  }
}

TEST_F(JTSortTest, SortKeyDependsTest) {
  const int num_tables = 50;
  MOCK_JOIN_TAB *arr[num_tables];

  /*
    key_dependency has higher precedence than found_records, so the
    tables shall be ordered with decreasing number of records in this
    test
  */
  for (int i = 0; i < num_tables; i++) {
    arr[i] = new (*THR_MALLOC) MOCK_JOIN_TAB(i, i);
    for (int j = i + 1; j < num_tables; j++) arr[i]->key_dependent |= 1ULL << j;
  }

  // MERGE SORT
  std::random_shuffle(arr, arr + num_tables);
  merge_sort(arr, arr + num_tables, Join_tab_compare_default());
  for (int i = 1; i < num_tables; i++)
    EXPECT_TRUE(arr[i]->found_records < arr[i - 1]->found_records);

  // INSERT SORT
  std::random_shuffle(arr, arr + num_tables);
  insert_sort(arr, arr + num_tables, Join_tab_compare_default());
  for (int i = 1; i < num_tables; i++)
    EXPECT_TRUE(arr[i]->found_records < arr[i - 1]->found_records);

  for (int i = 0; i < num_tables; i++) destroy(arr[i]);
}

/*
  Above, sorting for JOIN_TABs were tested. Below we check that the
  sorting works for ints types as well.
*/

class Int_compare_ptr {
 public:
  bool operator()(const int *i1, const int *i2) const { return *i1 < *i2; }
};

TEST_F(JTSortTest, SortIntTest) {
  const uint ints_to_sort = 1000;

  std::vector<int> arr;
  std::vector<int *> arr_ptr;

  arr.reserve(ints_to_sort);
  arr_ptr.reserve(ints_to_sort);

  for (uint i = 0; i < ints_to_sort; i++) {
    arr.push_back(i);
    arr_ptr.push_back(&arr[i]);
  }

  EXPECT_TRUE(arr.size() == ints_to_sort);
  EXPECT_TRUE(arr_ptr.size() == ints_to_sort);

  // MERGE SORT
  std::random_shuffle(&arr_ptr.front(), &arr_ptr.back() + 1);
  merge_sort(&arr_ptr.front(), &arr_ptr.back() + 1, Int_compare_ptr());
  for (uint i = 0; i < arr_ptr.size(); i++) EXPECT_TRUE(*arr_ptr[i] == (int)i);

  // INSERT SORT
  std::random_shuffle(&arr_ptr.front(), &arr_ptr.back() + 1);
  insert_sort(&arr_ptr.front(), &arr_ptr.back() + 1, Int_compare_ptr());
  for (uint i = 0; i < arr_ptr.size(); i++) EXPECT_TRUE(*arr_ptr[i] == (int)i);
}

TEST_F(JTSortTest, SortInt2Test) {
  const uint ints_to_sort = 1000;

  std::vector<int> arr;
  std::vector<int *> arr_ptr;

  arr.reserve(ints_to_sort);
  arr_ptr.reserve(ints_to_sort);

  for (uint i = 0; i < (ints_to_sort - 2); i++) {
    arr.push_back((i % 2) ? i : (i * -1));
    arr_ptr.push_back(&arr[i]);
  }

  arr.push_back(INT_MAX32);
  arr_ptr.push_back(&arr.back());

  arr.push_back(INT_MIN32);
  arr_ptr.push_back(&arr.back());

  EXPECT_TRUE(arr.size() == ints_to_sort);
  EXPECT_TRUE(arr_ptr.size() == ints_to_sort);

  // MERGE SORT
  std::random_shuffle(&arr_ptr.front(), &arr_ptr.back() + 1);
  merge_sort(&arr_ptr.front(), &arr_ptr.back() + 1, Int_compare_ptr());
  for (uint i = 1; i < arr_ptr.size(); i++)
    EXPECT_TRUE(*arr_ptr[i - 1] < *arr_ptr[i]);

  // INSERT SORT
  std::random_shuffle(&arr_ptr.front(), &arr_ptr.back() + 1);
  insert_sort(&arr_ptr.front(), &arr_ptr.back() + 1, Int_compare_ptr());
  for (uint i = 1; i < arr_ptr.size(); i++)
    EXPECT_TRUE(*arr_ptr[i - 1] < *arr_ptr[i]);
}

}  // namespace join_tab_sort_unittest