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#include <string.h>
#include "base/mutex.h"
#include "base/thread.h"
#include "base/util.h"
#include "testing/base/public/gunit.h"

namespace mozc {
namespace {

int g_counter = 0;

class TestThread : public Thread {
 public:
  TestThread(Mutex *mutex, int loop, int sleep)
      : mutex_(mutex), loop_(loop), sleep_(sleep) {}

  virtual void Run() {
    for (int i = 0; i < loop_; ++i) {
      {
        scoped_lock l(mutex_);
        ++g_counter;
      }
      Util::Sleep(sleep_);
    }
  }

 private:
  Mutex *mutex_;
  int loop_;
  int sleep_;
};

TEST(MutexTest, MutexBasicTest) {
  g_counter = 0;
  Mutex mutex;
  TestThread t(&mutex, 1, 1000);
  t.Start();

  Util::Sleep(100);       // still g_counter is locked
  scoped_lock l(&mutex);  // get mutex 2nd
  ++g_counter;
  EXPECT_EQ(2, g_counter);
  t.Join();               // make sure that the thread no longer uses the mutex
}

TEST(MutexTest, MutexBatchTest) {
  const int kThreadsSize = 5;
  const int kLoopSize = 10;
  vector<TestThread *> threads(kThreadsSize);

  g_counter = 0;

  Mutex mutex;
  for (int i = 0; i < kThreadsSize; ++i) {
    threads[i] = new TestThread(&mutex, kLoopSize, 1);
  }

  for (int i = 0; i < kThreadsSize; ++i) {
    threads[i]->Start();
  }

  for (int i = 0; i < kThreadsSize; ++i) {
    threads[i]->Join();
  }

  for (int i = 0; i < kThreadsSize; ++i) {
    delete threads[i];
  }

  EXPECT_EQ(kThreadsSize * kLoopSize, g_counter);
}

void CallbackFunc() {
  ++g_counter;
  Util::Sleep(20);
}

TEST(CallOnceTest, CallOnceBasicTest) {
  g_counter = 0;
  once_t once = MOZC_ONCE_INIT;
  CallOnce(&once, CallbackFunc);
  EXPECT_EQ(1, g_counter);

  CallOnce(&once, CallbackFunc);
  EXPECT_EQ(1, g_counter);

  CallOnce(&once, CallbackFunc);
  EXPECT_EQ(1, g_counter);
}
}  // namespace
}  // namespace mozc