#include "gtest/gtest.h"

#include "lldb/Utility/TaskPool.h"

TEST(TaskPoolTest, AddTask) {
  auto fn = [](int x) { return x * x + 1; };

  auto f1 = TaskPool::AddTask(fn, 1);
  auto f2 = TaskPool::AddTask(fn, 2);
  auto f3 = TaskPool::AddTask(fn, 3);
  auto f4 = TaskPool::AddTask(fn, 4);

  ASSERT_EQ(10, f3.get());
  ASSERT_EQ(2, f1.get());
  ASSERT_EQ(17, f4.get());
  ASSERT_EQ(5, f2.get());
}

TEST(TaskPoolTest, RunTasks) {
  std::vector<int> r(4);

  auto fn = [](int x, int &y) { y = x * x + 1; };

  TaskPool::RunTasks([fn, &r]() { fn(1, r[0]); }, [fn, &r]() { fn(2, r[1]); },
                     [fn, &r]() { fn(3, r[2]); }, [fn, &r]() { fn(4, r[3]); });

  ASSERT_EQ(2, r[0]);
  ASSERT_EQ(5, r[1]);
  ASSERT_EQ(10, r[2]);
  ASSERT_EQ(17, r[3]);
}

TEST(TaskPoolTest, TaskRunner) {
  auto fn = [](int x) { return std::make_pair(x, x * x); };

  TaskRunner<std::pair<int, int>> tr;
  tr.AddTask(fn, 1);
  tr.AddTask(fn, 2);
  tr.AddTask(fn, 3);
  tr.AddTask(fn, 4);

  int count = 0;
  while (true) {
    auto f = tr.WaitForNextCompletedTask();
    if (!f.valid())
      break;

    ++count;
    std::pair<int, int> v = f.get();
    ASSERT_EQ(v.first * v.first, v.second);
  }

  ASSERT_EQ(4, count);
}
