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#include "testing/base/public/googletest.h"
#include "testing/base/public/gunit.h"

#include "session/commands.pb.h"
#include "win32/base/deleter.h"
#include "win32/base/input_state.h"
#include "win32/base/keyboard.h"

namespace mozc {
namespace win32 {

namespace {

const BYTE kPressed = 0x80;
const uint64 kOutputId = 0x12345678;

class KeyboardMock : public Win32KeyboardInterface {
 public:
  KeyboardMock() {}

  virtual bool IsKanaLocked(const KeyboardStatus &keyboard_state) {
    return keyboard_state.IsPressed(VK_KANA);
  }

  virtual bool SetKeyboardState(const KeyboardStatus &keyboard_state) {
    key_state_ = keyboard_state;
    return true;
  }

  virtual bool GetKeyboardState(KeyboardStatus *keyboard_state) {
    *keyboard_state = key_state_;
    return true;
  }

  virtual bool AsyncIsKeyPressed(int virtual_key) {
    return async_key_state_.IsPressed(virtual_key);
  }

  virtual int ToUnicode(UINT virtual_key, UINT scan_code,
                        const BYTE *key_state, LPWSTR unicode_buffer,
                        int unicode_buffer_num_elements, UINT flags) {
    // We use a mock class in case the Japanese keyboard layout is not
    // available on this system.  This emulator class should work well in most
    // cases.  It returns an unicode character (if any) as if Japanese keyboard
    // layout was currently active.
    return JapaneseKeyboardLayoutEmulator::ToUnicode(
        virtual_key, scan_code, key_state, unicode_buffer,
        unicode_buffer_num_elements, flags);
  }

  virtual UINT SendInput(const vector<INPUT> &inputs) {
    last_send_input_data_ = inputs;
    return inputs.size();
  }

  const KeyboardStatus &key_state() const {
    return key_state_;
  }

  void set_key_state(const KeyboardStatus &key_state) {
    key_state_ = key_state;
  }

  const KeyboardStatus &async_key_state() const {
    return async_key_state_;
  }

  void set_async_key_state(const KeyboardStatus &async_key_state) {
    async_key_state_ = async_key_state;
  }

  const vector<INPUT> &last_send_input_data() const {
    return last_send_input_data_;
  }

  void clear_last_send_input_data() {
    last_send_input_data_.clear();
  }

 private:
  KeyboardStatus key_state_;
  KeyboardStatus async_key_state_;
  vector<INPUT> last_send_input_data_;
  DISALLOW_COPY_AND_ASSIGN(KeyboardMock);
};

}  // namespace

TEST(VKBackBasedDeleterTest, OnKeyEventTestWhenNoDeletionIsOngoing) {
  KeyboardMock *keyboard_mock = new KeyboardMock();
  VKBackBasedDeleter deleter(keyboard_mock);
  commands::Output output;
  output.set_id(kOutputId);

  InputState ime_state;

  EXPECT_FALSE(deleter.IsDeletionOngoing());
  EXPECT_EQ(0, keyboard_mock->last_send_input_data().size());

  // OnKeyEvent never crashes even when there is no ongoing session.
  EXPECT_EQ(VKBackBasedDeleter::DO_DEFAULT_ACTION,
      deleter.OnKeyEvent(VK_BACK, true, true));
}

TEST(VKBackBasedDeleterTest, BeginDeletionTest_DeletionCountZero) {
  KeyboardMock *keyboard_mock = new KeyboardMock();
  VKBackBasedDeleter deleter(keyboard_mock);
  commands::Output output;
  output.set_id(kOutputId);

  InputState ime_state;

  // If the deletion count is zero, no deletion operation is started.
  deleter.BeginDeletion(0, output, ime_state);
  EXPECT_FALSE(deleter.IsDeletionOngoing());
  EXPECT_EQ(0, keyboard_mock->last_send_input_data().size());
}

TEST(VKBackBasedDeleterTest, NormalSequence) {
  const UINT kLastKey = 'A';

  KeyboardMock *keyboard_mock = new KeyboardMock();

  // VKBackBasedDeleter must clear any modifier before calling SendInput.
  // To check this functionality, set VK_CONTROL bit into the mock.
  // See b/3419452 for detailed information.
  {
    KeyboardStatus keyboard_state;
    keyboard_state.SetState(VK_CONTROL, kPressed);
    keyboard_mock->set_key_state(keyboard_state);
  }
  {
    KeyboardStatus async_keyboard_state;
    async_keyboard_state.SetState(VK_CONTROL, kPressed);
    keyboard_mock->set_async_key_state(async_keyboard_state);
  }

  VKBackBasedDeleter deleter(keyboard_mock);
  commands::Output output;
  output.set_id(kOutputId);

  InputState ime_state;
  ime_state.last_down_key = VirtualKey::FromVirtualKey(kLastKey);

  // Delete proceeding 3 characters.
  deleter.BeginDeletion(3, output, ime_state);
  EXPECT_FALSE(keyboard_mock->key_state().IsPressed(VK_CONTROL));
  EXPECT_TRUE(keyboard_mock->async_key_state().IsPressed(VK_CONTROL));
  EXPECT_TRUE(deleter.IsDeletionOngoing());

  // Expect three pairs of VK_BACK [down/up] for deleting proceeding characters
  // and one pair of VK_BACK [down/up] as a sentinel key event where pending
  // output and ime state wiil be applied.
  const vector<INPUT> inputs = keyboard_mock->last_send_input_data();
  EXPECT_EQ(8, inputs.size());
  EXPECT_EQ(VK_BACK, inputs[0].ki.wVk);
  EXPECT_EQ(VK_BACK, inputs[1].ki.wVk);
  EXPECT_EQ(VK_BACK, inputs[2].ki.wVk);
  EXPECT_EQ(VK_BACK, inputs[3].ki.wVk);
  EXPECT_EQ(VK_BACK, inputs[4].ki.wVk);
  EXPECT_EQ(VK_BACK, inputs[5].ki.wVk);
  EXPECT_EQ(VK_BACK, inputs[6].ki.wVk);
  EXPECT_EQ(VK_BACK, inputs[7].ki.wVk);
  EXPECT_EQ(0, inputs[0].ki.dwFlags);
  EXPECT_EQ(KEYEVENTF_KEYUP, inputs[1].ki.dwFlags);
  EXPECT_EQ(0, inputs[2].ki.dwFlags);
  EXPECT_EQ(KEYEVENTF_KEYUP, inputs[3].ki.dwFlags);
  EXPECT_EQ(0, inputs[4].ki.dwFlags);
  EXPECT_EQ(KEYEVENTF_KEYUP, inputs[5].ki.dwFlags);
  EXPECT_EQ(0, inputs[6].ki.dwFlags);
  EXPECT_EQ(KEYEVENTF_KEYUP, inputs[7].ki.dwFlags);

  // Initially, the deleter is waiting for the first VK_BACK test-key-down.
  EXPECT_EQ(VKBackBasedDeleter::DO_DEFAULT_ACTION,
      deleter.OnKeyEvent(VK_TAB, true, true));
  EXPECT_EQ(VKBackBasedDeleter::DO_DEFAULT_ACTION,
      deleter.OnKeyEvent(VK_TAB, false, true));
  EXPECT_EQ(VKBackBasedDeleter::DO_DEFAULT_ACTION,
      deleter.OnKeyEvent('X', true, true));
  EXPECT_EQ(VKBackBasedDeleter::DO_DEFAULT_ACTION,
      deleter.OnKeyEvent('X', false, true));

  // The first pair of test-key-down/up.
  EXPECT_EQ(VKBackBasedDeleter::SEND_KEY_TO_APPLICATION,
      deleter.OnKeyEvent(VK_BACK, true, true));
  EXPECT_EQ(VKBackBasedDeleter::SEND_KEY_TO_APPLICATION,
      deleter.OnKeyEvent(VK_BACK, false, true));

  // The second pair of test-key-down/up.
  EXPECT_EQ(VKBackBasedDeleter::SEND_KEY_TO_APPLICATION,
      deleter.OnKeyEvent(VK_BACK, true, true));
  EXPECT_EQ(VKBackBasedDeleter::SEND_KEY_TO_APPLICATION,
      deleter.OnKeyEvent(VK_BACK, false, true));

  // The third pair of test-key-down/up.
  EXPECT_EQ(VKBackBasedDeleter::SEND_KEY_TO_APPLICATION,
      deleter.OnKeyEvent(VK_BACK, true, true));
  EXPECT_EQ(VKBackBasedDeleter::SEND_KEY_TO_APPLICATION,
      deleter.OnKeyEvent(VK_BACK, false, true));

  // The last key-down will not be sent to the application.
  EXPECT_EQ(VKBackBasedDeleter::CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER,
      deleter.OnKeyEvent(VK_BACK, true, true));
  EXPECT_EQ(VKBackBasedDeleter::APPLY_PENDING_STATUS,
      deleter.OnKeyEvent(VK_BACK, true, false));

  // Check the pending output and state.
  EXPECT_EQ(kOutputId, deleter.pending_output().id());
  EXPECT_EQ(kLastKey, deleter.pending_ime_state().last_down_key.virtual_key());

  // The last key-up will not be sent to the application.
  EXPECT_EQ(VKBackBasedDeleter::CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER,
      deleter.OnKeyEvent(VK_BACK, false, true));
  EXPECT_EQ(VKBackBasedDeleter::CALL_END_DELETION_BUT_NEVER_SEND_TO_SERVER,
      deleter.OnKeyEvent(VK_BACK, false, false));

  // Make sure the status of modifier keys have not changed.
  EXPECT_FALSE(keyboard_mock->key_state().IsPressed(VK_CONTROL));
  EXPECT_TRUE(keyboard_mock->async_key_state().IsPressed(VK_CONTROL));

  // The caller must call EndDeletion when
  // CALL_END_DELETION_BUT_NEVER_SEND_TO_SERVER is returned.
  deleter.EndDeletion();

  // After EndDeletion, the modifier state should be restored based on the
  // async key state.
  EXPECT_TRUE(keyboard_mock->key_state().IsPressed(VK_CONTROL));
  EXPECT_TRUE(keyboard_mock->async_key_state().IsPressed(VK_CONTROL));

  // Internal status must be reset by VKBackBasedDeleter::Reset().
  EXPECT_FALSE(deleter.IsDeletionOngoing());
}

TEST(VKBackBasedDeleterTest, BeginDeletion_InsuccessfulCase) {
  const UINT kLastKey = 'A';

  KeyboardMock *keyboard_mock = new KeyboardMock();

  // VKBackBasedDeleter must clear any modifier before calling SendInput.
  // To check this functionality, set VK_CONTROL bit into the mock.
  // See b/3419452 for detailed information.
  {
    KeyboardStatus keyboard_state;
    keyboard_state.SetState(VK_CONTROL, kPressed);
    keyboard_mock->set_key_state(keyboard_state);
  }
  {
    KeyboardStatus async_keyboard_state;
    async_keyboard_state.SetState(VK_CONTROL, kPressed);
    keyboard_mock->set_async_key_state(async_keyboard_state);
  }

  VKBackBasedDeleter deleter(keyboard_mock);

  commands::Output output;
  output.set_id(kOutputId);

  InputState ime_state;
  ime_state.last_down_key = VirtualKey::FromVirtualKey(kLastKey);

  // Delete proceeding 3 characters.
  deleter.BeginDeletion(3, output, ime_state);
  EXPECT_FALSE(keyboard_mock->key_state().IsPressed(VK_CONTROL));
  EXPECT_TRUE(keyboard_mock->async_key_state().IsPressed(VK_CONTROL));

  EXPECT_TRUE(deleter.IsDeletionOngoing());

  // The first pair of test-key-down/up.
  EXPECT_EQ(VKBackBasedDeleter::SEND_KEY_TO_APPLICATION,
      deleter.OnKeyEvent(VK_BACK, true, true));
  EXPECT_EQ(VKBackBasedDeleter::SEND_KEY_TO_APPLICATION,
      deleter.OnKeyEvent(VK_BACK, false, true));

  // If an unexpected key is passed, the deletion sequence must be terminated.
  EXPECT_EQ(VKBackBasedDeleter::CALL_END_DELETION_THEN_DO_DEFAULT_ACTION,
      deleter.OnKeyEvent(VK_TAB, true, true));

  // Make sure the status of modifier keys have not changed.
  EXPECT_FALSE(keyboard_mock->key_state().IsPressed(VK_CONTROL));
  EXPECT_TRUE(keyboard_mock->async_key_state().IsPressed(VK_CONTROL));

  // The caller must call EndDeletion when
  // CALL_END_DELETION_THEN_DO_DEFAULT_ACTION is returned.
  deleter.EndDeletion();

  // After EndDeletion, the modifier state should be restored based on the
  // async key state.
  EXPECT_TRUE(keyboard_mock->key_state().IsPressed(VK_CONTROL));
  EXPECT_TRUE(keyboard_mock->async_key_state().IsPressed(VK_CONTROL));

  // Internal status must be reset by VKBackBasedDeleter::Reset().
  EXPECT_FALSE(deleter.IsDeletionOngoing());
}

}  // namespace win32
}  // namespace mozc