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// Licensed to the Software Freedom Conservancy (SFC) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The SFC licenses this file
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// to you under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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//     http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef WEBDRIVER_HOOKPROCESSOR_H_
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#define WEBDRIVER_HOOKPROCESSOR_H_
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#include <string>
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#include <vector>
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namespace webdriver {
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enum HookCommunicationType {
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  OneWay = 0,
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  TwoWay = 1
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};
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struct HookSettings {
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  std::string hook_procedure_name;
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  int hook_procedure_type;
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  HookCommunicationType communication_type;
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  HWND window_handle;
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};
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class HookProcessor {
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 public:
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  HookProcessor(void);
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  virtual ~HookProcessor(void);
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  static int GetDataBufferSize(void);
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  static void SetDataBufferSize(int size);
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  static void* GetDataBufferAddress(void);
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  static int GetEventCount(void);
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  static void ResetEventCount(void);
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  static void IncrementEventCount(int increment);
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  static void ResetFlag(void);
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  static bool GetFlagValue(void);
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  static void SetFlagValue(bool flag_value);
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  static void CopyDataToBuffer(int source_data_size, void* source);
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  static void CopyDataFromBuffer(int destination_data_size, void* destination);
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  static void CopyWStringToBuffer(const std::wstring& data);
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  static std::wstring CopyWStringFromBuffer(void);
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  static void WriteBufferToPipe(const int process_id);
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  bool CanSetWindowsHook(HWND window_handle);
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  void Initialize(const HookSettings& settings);
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  void Initialize(const std::string& hook_proc_name, const int hook_proc_type);
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  void Dispose(void);
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  bool PushData(int data_size,
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                void* pointer_to_data);
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  bool PushData(const std::wstring& data);
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  int PullData(std::vector<char>* data);
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  int PullData(std::wstring data);
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 private:
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  static void ClearBuffer(void);
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  void CreateReturnPipe(void);
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  bool InstallWindowsHook(const std::string& hook_proc_name,
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                          const int hook_proc_type);
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  void UninstallWindowsHook(void);
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  bool Is64BitProcess(HANDLE process_handle);
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  HookCommunicationType communication_type_;
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  HWND window_handle_;
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  HHOOK hook_procedure_handle_;
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  HANDLE pipe_handle_;
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};
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} // namespace webdriver
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#endif // WEBDRIVER_HOOKPROCESSOR_H_
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