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//
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// An abstract interface for the client class.

#ifndef MOZC_CLIENT_CLIENT_INTERFACE_H_
#define MOZC_CLIENT_CLIENT_INTERFACE_H_

#include <string>
#include "base/port.h"
#include "session/commands.pb.h"

namespace mozc {

class IPCClientFactoryInterface;

namespace config {
class Config;
}

namespace commands {
class Capability;
class KeyEvent;
class Output;
class SessionCommand;
}

namespace client {
class ClientInterface;

class ServerLauncherInterface {
 public:
  enum ServerErrorType {
    SERVER_TIMEOUT,
    SERVER_BROKEN_MESSAGE,
    SERVER_VERSION_MISMATCH,
    SERVER_SHUTDOWN,
    SERVER_FATAL,
  };

  virtual bool StartServer(ClientInterface *client) = 0;

  // terminate the server.
  // You should not call this method unless protocol version mismatch happens.
  virtual bool ForceTerminateServer(const string &name) = 0;

  // Wait server until it terminates
  virtual bool WaitServer(uint32 pid) = 0;

  // called when fatal error occured.
  virtual void OnFatal(ServerErrorType type) = 0;

  // set the full path of server program.
  virtual void set_server_program(const string &server_program) = 0;

  // return the full path of server program
  // This is used for making IPC connection.
  virtual const string &server_program() const = 0;

  // launch with restricted mode
  virtual void set_restricted(bool restricted) = 0;

  // Sets the flag of error dialog suppression.
  virtual void set_suppress_error_dialog(bool suppress) = 0;

  ServerLauncherInterface() {}
  virtual ~ServerLauncherInterface() {}
};


class ClientInterface {
 public:
  virtual ~ClientInterface() {}

  // NOTE: Client class does NOT take the ownership of client_factory
  virtual void SetIPCClientFactory(
      IPCClientFactoryInterface *client_factory) = 0;

  // set ServerLauncher.
  // ServerLauncher is used as default
  // NOTE: Client class takes the owership of start_server_handler.
  virtual void SetServerLauncher(ServerLauncherInterface *server_launcher) = 0;

  // return true if the current thread is running
  // inside valid run level.
  virtual bool IsValidRunLevel() const = 0;

  // Returns true if connection is alive.
  // If connection is not available,  re-launch mozc_server internally.
  virtual bool EnsureConnection() = 0;

  // Returns true if session id is valid.
  // if session id is invalid, re-issue a valid sssion id.
  virtual bool EnsureSession() = 0;

  // Checks protocol/product version.
  // If a  new version is avaialable, restart the server.
  // return true the server is available.
  // return false some error happend during the server restart.
  // This method calls EnsureConnection automatically.
  virtual bool CheckVersionOrRestartServer() = 0;

  // SendKey/TestSendKey/SendCommand automatically
  // make a connection and issue an session id
  // if valid session id is not found.
  bool SendKey(const commands::KeyEvent &key,
               commands::Output *output) {
    return SendKeyWithContext(key,
                              commands::Context::default_instance(),
                              output);
  }

  bool TestSendKey(const commands::KeyEvent &key,
                   commands::Output *output) {
    return TestSendKeyWithContext(key,
                                  commands::Context::default_instance(),
                                  output);
  }

  bool SendCommand(const commands::SessionCommand &command,
                   commands::Output *output) {
    return SendCommandWithContext(command,
                                  commands::Context::default_instance(),
                                  output);
  }

  virtual bool SendKeyWithContext(const commands::KeyEvent &key,
                                  const commands::Context &context,
                                  commands::Output *output) = 0;
  virtual bool TestSendKeyWithContext(const commands::KeyEvent &key,
                                      const commands::Context &context,
                                      commands::Output *output) = 0;
  virtual bool SendCommandWithContext(const commands::SessionCommand &command,
                                      const commands::Context &context,
                                      commands::Output *output) = 0;

  // The methods below don't call
  // StartServer even if server is not available. This treatment
  // avoids unexceptional and continuous server restart trials.
  // If you really want to ensure the connection,
  // call EnsureConnection() in advance.

  // Get/Set config data
  virtual bool GetConfig(config::Config *config) = 0;
  virtual bool SetConfig(const config::Config &config) = 0;

  // Clear history data
  virtual bool ClearUserHistory() = 0;
  virtual bool ClearUserPrediction() = 0;
  virtual bool ClearUnusedUserPrediction() = 0;

  // Shutdonw server
  virtual bool Shutdown() = 0;

  // Sync server data, e.g, (prediction data) into disk
  virtual bool SyncData() = 0;

  // Reload server data, e.g., (user dictionary, prediction data)
  virtual bool Reload() = 0;

  // Cleanup un-used sessions
  virtual bool Cleanup() = 0;

  // Resets internal state (changs the state to be SERVER_UNKNWON)
  virtual void Reset() = 0;

  // Returns true if server is alive.
  // This method will never change the internal state.
  virtual bool PingServer() const = 0;

  // This method is similar to PingServer(), but the internal
  // state may change. In almost all cases, you don't need to
  // call this method.
  virtual bool NoOperation() = 0;

  // Enables or disables using cascading window.
  virtual void EnableCascadingWindow(bool enable) = 0;

  // Sets the time out in milli second used for the IPC connection.
  virtual void set_timeout(int timeout) = 0;

  // Sets restricted mode.
  // server is launched inside restricted enviroment.
  virtual void set_restricted(bool restricted) = 0;

  // Sets server program path.
  // mainly for unittesting.
  virtual void set_server_program(const string &program_path) = 0;

  // Sets the flag of error dialog suppression.
  virtual void set_suppress_error_dialog(bool suppress) = 0;

  // Sets client capability.
  virtual void set_client_capability(const commands::Capability &capability)
      = 0;

  // Launches mozc tool. |mode| is the mode of MozcTool,
  // e,g,. "config_dialog", "dictionary_tool".
  virtual bool LaunchTool(const string &mode,
                          const string &extra_arg) = 0;
  // Launches mozc_tool with output message.
  // If launch_tool_mode has no value or is set as NO_TOOL, this function will
  // do nothing and return false.
  virtual bool LaunchToolWithProtoBuf(const commands::Output &output) = 0;

  // Launches browser and pass |url|
  virtual bool OpenBrowser(const string &url) = 0;

 protected:
  ClientInterface() {}
};

class ClientFactoryInterface {
 public:
  virtual ~ClientFactoryInterface() {}
  virtual ClientInterface *NewClient() = 0;
};

class ClientFactory {
 public:
  // Return a new client.
  static ClientInterface *NewClient();

  // Set a ClientFactoryInterface for unittesting.
  static void SetClientFactory(ClientFactoryInterface *client_factory);

 private:
  ClientFactory() {}
  ~ClientFactory() {}
};

class SendCommandInterface {
 public:
  virtual ~SendCommandInterface() {}
  virtual bool SendCommand(const commands::SessionCommand &command,
                           commands::Output *output) = 0;
};
}  // namespace client
}  // namespace mozc
#endif  // MOZC_CLIENT_CLIENT_INTERFACE_H_