#include <algorithm>
#include <iterator>
#include <vector>

#include <gtest/gtest.h>

#include "data_structures/concurrent/skiplist.hpp"
#include "storage/common/index.hpp"

template <class TIterable>
int Count(TIterable &collection) {
  int ret = 0;
  for (__attribute__((unused)) auto it : collection) ret += 1;
  return ret;
}

TEST(SkipListSuffix, EmptyRange) {
  SkipList<int> V;
  auto access = V.access();
  auto r1 = database::index::SkipListSuffix<typename SkipList<int>::Iterator,
                                            int, SkipList<int>>(
      access.begin(), std::move(access));
  EXPECT_EQ(Count(r1), 0);
}

TEST(SkipListSuffix, NonEmptyRange) {
  SkipList<int> V;
  auto access = V.access();
  access.insert(1);
  access.insert(5);
  access.insert(3);
  auto r1 = database::index::SkipListSuffix<typename SkipList<int>::Iterator,
                                            int, SkipList<int>>(
      access.begin(), std::move(access));
  EXPECT_EQ(Count(r1), 3);
  auto iter = r1.begin();
  EXPECT_EQ(*iter, 1);
  ++iter;
  EXPECT_EQ(*iter, 3);
  ++iter;
  EXPECT_EQ(*iter, 5);
}