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#include "ipc/named_event.h"

#include <string>

#include "base/port.h"
#include "base/system_util.h"
#include "base/thread.h"
#include "base/util.h"
#include "testing/base/public/gunit.h"

DECLARE_string(test_tmpdir);

namespace mozc {

namespace {
const char kName[] = "named_event_test";
const int kNumRequests = 5;

class NamedEventNotifierThread: public Thread {
 public:
  void Run() {
    Util::Sleep(100);
    NamedEventNotifier n(kName);
    EXPECT_TRUE(n.IsAvailable());
    Util::Sleep(500);
    EXPECT_TRUE(n.Notify());
  }
};

class NamedEventListenerThread: public Thread {
 public:
  void Run() {
    NamedEventListener n(kName);
    EXPECT_TRUE(n.IsAvailable());
    EXPECT_FALSE(n.Wait(500));
    EXPECT_TRUE(n.Wait(2000));
  }
};

TEST(NamedEventTest, NamedEventBasicTest) {
  SystemUtil::SetUserProfileDirectory(FLAGS_test_tmpdir);

  for (int i = 0; i < kNumRequests; ++i) {
    NamedEventNotifierThread t;
    NamedEventListener l(kName);
    EXPECT_TRUE(l.IsAvailable());
    t.Start();
    EXPECT_FALSE(l.Wait(200));
    Util::Sleep(100);
    EXPECT_TRUE(l.Wait(500));
    t.Join();
  }
}

TEST(NamedEventTest, IsAvailableTest) {
  {
    NamedEventListener l(kName);
    EXPECT_TRUE(l.IsAvailable());
    NamedEventNotifier n(kName);
    EXPECT_TRUE(n.IsAvailable());
  }

  // no listner
  {
    NamedEventNotifier n(kName);
    EXPECT_FALSE(n.IsAvailable());
  }
}

TEST(NamedEventTest, IsOwnerTest) {
  for (int i = 0; i < kNumRequests; ++i) {
    NamedEventListener l1(kName);
    EXPECT_TRUE(l1.IsOwner());
    EXPECT_TRUE(l1.IsAvailable());
    NamedEventListener l2(kName);
    EXPECT_FALSE(l2.IsOwner());   // the instance is owneded by l1
    EXPECT_TRUE(l2.IsAvailable());
  }
}

TEST(NamedEventTest, NamedEventMultipleListenerTest) {
  SystemUtil::SetUserProfileDirectory(FLAGS_test_tmpdir);

  // mozc::Thread is not designed as value-semantics.
  // So here we use pointers to maintain these instances.
  vector<NamedEventListenerThread *> t(kNumRequests);
  for (int i = 0; i < kNumRequests; ++i) {
    t[i] = new NamedEventListenerThread;
    t[i]->Start();
  }

  // all |kNumRequests| listener events should be raised
  // at once with single notifier event
  Util::Sleep(1000);
  NamedEventNotifier n(kName);
  EXPECT_TRUE(n.Notify());

  for (int i = 0; i < kNumRequests; ++i) {
    t[i]->Join();
    delete t[i];
    t[i] = NULL;
  }
}

TEST(NamedEventTest, NamedEventPathLengthTest) {
#ifndef OS_WIN
  const string name_path = NamedEventUtil::GetEventPath(kName);
  // length should be less than 14 not includeing terminating null.
  EXPECT_EQ(13, strlen(name_path.c_str()));
#endif  // OS_WIN
}
}  // namespace
}  // namespace mozc