/* Copyright (c) 2011, 2012, 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 as published by
   the Free Software Foundation; version 2 of the License.

   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 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 */

// First include (the generated) my_config.h, to get correct platform defines.
#include "my_config.h"
#include <gtest/gtest.h>

#include "sql_plist.h"
#include "test_utils.h"

namespace sql_plist_unittest {

// A simple helper function to insert values into a List.
template <class T, int size, class L>
void insert_values(T (&array)[size], L *list)
{
  uint ix, elements= list->elements();
  for (ix= 0; ix < size; ++ix)
    list->push_back(&array[ix]);
  EXPECT_EQ(ix + elements, list->elements());
}

/*
  The fixture for testing the MySQL List and List_iterator classes.
  A fresh instance of this class will be created for each of the
  TEST_F functions below.
*/
class IPListTest : public ::testing::Test
{
protected:
  IPListTest()
    : m_int_list(), m_int_list_iter(m_int_list)
  {
  }

public:
  template<typename V>
  struct I_P_ListTestValue
  {
    V value;
    I_P_ListTestValue(V val) : value(val) {}
    bool operator == (const I_P_ListTestValue<V> &obj) const
    { return value == obj.value; }
    struct I_P_ListTestValue<V> *next;
    struct I_P_ListTestValue<V> **prev;
  };

protected:
  template<typename V>
  struct I_P_ListCountedPushBack
  {
    typedef I_P_ListTestValue<V> Value;
    typedef I_P_List<Value,
                     I_P_List_adapter<Value, &Value::next, &Value::prev>,
                     I_P_List_counter,
                     I_P_List_fast_push_back<Value>
                    > Type;
  };

  I_P_ListCountedPushBack<int>::Type m_int_list;
  I_P_ListCountedPushBack<int>::Type::Iterator m_int_list_iter;

private:
  // Declares (but does not define) copy constructor and assignment operator.
  GTEST_DISALLOW_COPY_AND_ASSIGN_(IPListTest);
};


// Allow construction of test messages via the << operator.
template<typename T>
std::ostream &operator<< (std::ostream &s,
                          const IPListTest::I_P_ListTestValue<T> &v)
{
  return s << v.value;
}


// Tests that we can construct and destruct lists.
TEST_F(IPListTest, ConstructAndDestruct)
{
  EXPECT_TRUE(m_int_list.is_empty());
  I_P_ListCountedPushBack<int>::Type *p_int_list;
  p_int_list= new I_P_ListCountedPushBack<int>::Type;
  EXPECT_TRUE(p_int_list->is_empty());
  delete p_int_list;
}


// Tests basic operations push and remove.
TEST_F(IPListTest, BasicOperations)
{
  I_P_ListTestValue<int> v1(1), v2(2), v3(3);
  m_int_list.push_front(&v1);
  m_int_list.insert_after(&v1, &v2);
  m_int_list.push_back(&v3);
  EXPECT_FALSE(m_int_list.is_empty());
  EXPECT_EQ(3U, m_int_list.elements());

  EXPECT_EQ(&v1, m_int_list.front());
  m_int_list.remove(&v1);
  EXPECT_EQ(&v2, m_int_list.front());
  m_int_list.remove(&v2);
  EXPECT_EQ(&v3, m_int_list.front());
  m_int_list.remove(&v3);
  EXPECT_TRUE(m_int_list.is_empty()) << "The list should be empty now!";
}


// Tests that we can iterate over values.
TEST_F(IPListTest, Iterate)
{
  I_P_ListTestValue<int> values[]= {3, 2, 1};
  insert_values(values, &m_int_list);
  m_int_list_iter.init(m_int_list);
  for (int ix= 0; ix < array_size(values); ++ix)
  {
    EXPECT_EQ(values[ix], *m_int_list_iter++);
  }
  m_int_list_iter.init(m_int_list);
  I_P_ListTestValue<int> *value;
  int value_number= 0;
  while ((value= m_int_list_iter++))
  {
    EXPECT_EQ(values[value_number++], value->value);
  }
}

}  // namespace