/*
  Copyright (c) 2013 Arduino LLC. All right reserved.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/

#ifndef PROCESS_H_
#define PROCESS_H_

#include <Bridge.h>

class Process : public Stream {
public:
  // Constructor with a user provided BridgeClass instance
  Process(BridgeClass &_b = Bridge) :
	  bridge(_b), started(false), buffered(0), readPos(0) { }
  ~Process();
  
  void begin(const String &command);
  void addParameter(const String &param);
  unsigned int run();
  void runAsynchronously();
  boolean running();
  unsigned int exitValue();
  void close();

  unsigned int runShellCommand(const String &command);
  void runShellCommandAsynchronously(const String &command);

  operator bool () { return started; }

  // Stream methods 
  // (read from process stdout)
  int available();
  int read();
  int peek();
  // (write to process stdin)
  size_t write(uint8_t);
  void flush();
  // TODO: add optimized function for block write
  
private:
  BridgeClass &bridge;
  unsigned int handle;
  String *cmdline;
  boolean started;

private:
  void doBuffer();
  uint8_t buffered;
  uint8_t readPos;
  static const int BUFFER_SIZE = 64;
  uint8_t buffer[BUFFER_SIZE];
  
};

#endif
