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#include "base/scheduler.h"

#include <algorithm>

#include "base/logging.h"
#include "base/scoped_ptr.h"
#include "base/unnamed_event.h"
#include "base/util.h"
#include "testing/base/public/gunit.h"

namespace mozc {
namespace {


const int32 kTimeout = 30 * 1000;  // 30 sec.
const int32 kNoRandomDelay = 0;
const int32 kImmediately = 0;
const int32 kShortPeriod = 10;      // 10 millisec.
const int32 kMediumPeriod = 100;    // 100 millisec.
const int32 kTooLongTime = 24 * 60 * 1000;  // 24 hours.

class SchedulerTest : public testing::Test {
 public:
  class ScopedJob {
   public:
    explicit ScopedJob(const Scheduler::JobSetting &setting)
        : name_(setting.name()) {
      Scheduler::AddJob(setting);
    }
    ~ScopedJob() {
      Scheduler::RemoveJob(name_);
    }

   private:
    const string name_;
  };

 protected:
  virtual void TearDown() {
    Scheduler::RemoveAllJobs();
  }
};

TEST_F(SchedulerTest, SimpleJob) {
  struct SharedInfo {
    UnnamedEvent first_event;
    UnnamedEvent second_event;
  };

  class TestCallback {
   public:
    static bool Do(void *ptr) {
      SharedInfo *info = static_cast<SharedInfo *>(ptr);
      static bool first_time = true;
      if (first_time) {
        EXPECT_TRUE(info->first_event.Notify());
        first_time = false;
        return true;  // continue
      }
      EXPECT_TRUE(info->second_event.Notify());
      return false;   // stop
    }
  };

  SharedInfo info;
  ASSERT_TRUE(info.first_event.IsAvailable());
  ASSERT_TRUE(info.second_event.IsAvailable());

  ScopedJob job(Scheduler::JobSetting(
      "Test", kShortPeriod, kShortPeriod, kImmediately, kNoRandomDelay,
      &TestCallback::Do, &info));
  ASSERT_TRUE(info.first_event.Wait(kTimeout));
  ASSERT_TRUE(info.second_event.Wait(kTimeout));
}

TEST_F(SchedulerTest, RemoveJob) {
  struct SharedInfo {
    SharedInfo()
        : running(false) {}
    UnnamedEvent first_event;
    volatile bool running;
  };

  class TestCallback {
   public:
    static bool Do(void *ptr) {
      SharedInfo *info = static_cast<SharedInfo *>(ptr);
      info->running = true;
      static bool first_time = true;
      if (first_time) {
        EXPECT_TRUE(info->first_event.Notify());
        first_time = false;
      }
      return true;  // continue
    }
  };

  SharedInfo info;
  ASSERT_TRUE(info.first_event.IsAvailable());
  {
    ScopedJob job(Scheduler::JobSetting(
        "Test", kShortPeriod, kShortPeriod, kImmediately, kNoRandomDelay,
        &TestCallback::Do, &info));
    // Make sure that the job is running.
    ASSERT_TRUE(info.first_event.Wait(kTimeout));
    ASSERT_TRUE(info.running);
    // Job is removed here.
  }

  info.running = false;

  // The sleep time is arbitrary, but longer sleep time makes the assertion
  // below stronger. Feel free to shorten it.
  Util::Sleep(kMediumPeriod);

  // Job should not be running anymore.
  EXPECT_FALSE(info.running);
}

TEST_F(SchedulerTest, Delay) {
  class TestCallback {
   public:
    static bool Do(void *ptr) {
      UnnamedEvent *event = static_cast<UnnamedEvent *>(ptr);
      EXPECT_TRUE(event->Notify());
      return false;
    }
  };

  {
    UnnamedEvent event;
    ASSERT_TRUE(event.IsAvailable());
    // This job will be delayed |kTooLongTime|.
    ScopedJob job(Scheduler::JobSetting(
        "Test", kShortPeriod, kShortPeriod, kTooLongTime, kNoRandomDelay,
        &TestCallback::Do, &event));
    // The timeout period is arbitrary, but longer timeout period makes the
    // assertion stronger. Feel free to shorten it.
    ASSERT_FALSE(event.Wait(kMediumPeriod));
  }

  {
    UnnamedEvent event;
    ASSERT_TRUE(event.IsAvailable());
    // This job will be delayed |kShortPeriod|.
    ScopedJob job(Scheduler::JobSetting(
        "Test", kShortPeriod, kShortPeriod, kShortPeriod, kNoRandomDelay,
        &TestCallback::Do, &event));
    ASSERT_TRUE(event.Wait(kTimeout));
  }
}

TEST_F(SchedulerTest, RandomDelay) {
  struct SharedInfo {
    UnnamedEvent first_event;
    UnnamedEvent second_event;
  };

  class TestCallback {
   public:
    static bool Do(void *ptr) {
      SharedInfo *info = static_cast<SharedInfo *>(ptr);
      static bool first_time = true;
      if (first_time) {
        EXPECT_TRUE(info->first_event.Notify());
        first_time = false;
        return true;  // continue
      }
      EXPECT_TRUE(info->second_event.Notify());
      return false;   // stop
    }
  };

  SharedInfo info;
  ASSERT_TRUE(info.first_event.IsAvailable());
  ASSERT_TRUE(info.second_event.IsAvailable());

  ScopedJob job(Scheduler::JobSetting(
      "Test", kShortPeriod, kShortPeriod, kImmediately, kMediumPeriod,
      &TestCallback::Do, &info));
  ASSERT_TRUE(info.first_event.Wait(kTimeout));
  ASSERT_TRUE(info.second_event.Wait(kTimeout));
}

TEST_F(SchedulerTest, DontBlockOtherJobs) {
  struct SharedInfo {
    UnnamedEvent notify_event;
    UnnamedEvent quit_event;
  };
  class BlockingCallback {
   public:
    static bool Do(void *ptr) {
      SharedInfo *info = static_cast<SharedInfo *>(ptr);
      const bool succeeded = info->notify_event.Notify();
      EXPECT_TRUE(succeeded);
      if (!succeeded) {
        return false;
      }
      EXPECT_TRUE(info->quit_event.Wait(kTimeout));
      return false;   // stop
    }
  };

  class SecondaryCallback {
   public:
    static bool Do(void *ptr) {
      UnnamedEvent *event = static_cast<UnnamedEvent *>(ptr);
      EXPECT_TRUE(event->Notify());
      return false;   // stop
    }
  };

  SharedInfo info;
  ASSERT_TRUE(info.notify_event.IsAvailable());
  ASSERT_TRUE(info.quit_event.IsAvailable());
  ScopedJob blocking_job(Scheduler::JobSetting(
      "TestJob1", kShortPeriod, kShortPeriod, kImmediately, kNoRandomDelay,
      &BlockingCallback::Do, &info));
  ASSERT_TRUE(info.notify_event.Wait(kTimeout));

  UnnamedEvent event;
  ScopedJob secondary_job(Scheduler::JobSetting(
      "TestJob2", kShortPeriod, kShortPeriod, kImmediately, kNoRandomDelay,
      &SecondaryCallback::Do, &event));
  ASSERT_TRUE(event.Wait(kTimeout));

  // Unblock |blocking_job|.
  EXPECT_TRUE(info.quit_event.Notify());
}


class NameCheckScheduler : public Scheduler::SchedulerInterface {
 public:
  explicit NameCheckScheduler(const string &expected_name)
      : expected_name_(expected_name) {}

  void RemoveAllJobs() {}
  bool RemoveJob(const string &name) { return true; }
  bool AddJob(const Scheduler::JobSetting &job_setting) {
    return (expected_name_ == job_setting.name());
  }

 private:
  const string expected_name_;
};

TEST(SchedulerInterfaceTest, SchedulerHandler) {
  scoped_ptr<NameCheckScheduler> scheduler_mock(new NameCheckScheduler("test"));
  Scheduler::SetSchedulerHandler(scheduler_mock.get());
  EXPECT_TRUE(Scheduler::AddJob(
      Scheduler::JobSetting("test", 0, 0, 0, 0, nullptr, nullptr)));
  EXPECT_FALSE(Scheduler::AddJob(
      Scheduler::JobSetting("not_test", 0, 0, 0, 0, nullptr, nullptr)));
  EXPECT_TRUE(Scheduler::RemoveJob("not_have"));
  Scheduler::RemoveAllJobs();
  Scheduler::SetSchedulerHandler(nullptr);
}

}  // namespace
}  // namespace mozc