/*! \file piprocess.h
 * \ingroup System
 * \~\brief
 * \~english External process
 * \~russian Внешний процесс
 */
/*
    PIP - Platform Independent Primitives
    Process
    Ivan Pelipenko peri4ko@yandex.ru

    This program 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 3 of the License, or
    (at your option) any later version.

    This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef PIPROCESS_H
#define PIPROCESS_H

#ifndef MICRO_PIP

#  include "pifile.h"
#  include "pithread.h"


//! \ingroup System
//! \~\brief
//! \~english External process.
//! \~russian Внешний процесс.
class PIP_EXPORT PIProcess: public PIThread {
	PIOBJECT_SUBCLASS(PIProcess, PIThread);

public:
	//! \~english Construct empty %PIProcess
	//! \~russian Создает пустой %PIProcess
	PIProcess();

	virtual ~PIProcess();


	//! \~english Returns last attached execution exit code
	//! \~russian Возвращает код завершения последнего выполнения
	int exitCode() const { return exit_code; }

	//! \~english Returns current attached execution process ID
	//! \~russian Возвращает ID процесса текущего выполнения
	int pID() const;

	void setGrabInput(bool yes) { g_in = yes; }

	//! \~english Set attached execution grab output stream enabled
	//! \~russian
	void setGrabOutput(bool yes) { g_out = yes; }

	//! \~english Set attached execution grab error stream enabled
	//! \~russian
	void setGrabError(bool yes) { g_err = yes; }

	void setInputFile(const PIString & path) { f_in.setPath(path); }

	//! \~english Set attached execution grab output stream file
	//! \~russian
	void setOutputFile(const PIString & path) { f_out.setPath(path); }

	//! \~english Set attached execution grab error stream file
	//! \~russian
	void setErrorFile(const PIString & path) { f_err.setPath(path); }

	void unsetInputFile() { f_in.setPath(""); }

	//! \~english Reset attached execution grab output stream file
	//! \~russian
	void unsetOutputFile() { f_out.setPath(""); }

	//! \~english Reset attached execution grab error stream file
	//! \~russian
	void unsetErrorFile() { f_err.setPath(""); }

	//! \~english Returns current attached execution working directory or empty string if it wasn`t set
	//! \~russian
	PIString workingDirectory() const { return wd; }

	//! \~english Set attached execution working directory
	//! \~russian
	void setWorkingDirectory(const PIString & path) { wd = path; }

	//! \~english Rseet attached execution working directory, application working dir will be used
	//! \~russian
	void resetWorkingDirectory() { wd.clear(); }

	//! \~english Returns all attached execution output stream
	//! \~russian
	PIByteArray readOutput(bool clear = false);

	//! \~english Returns all attached execution error stream
	//! \~russian
	PIByteArray readError(bool clear = false);

	//! \~english Returns current attached execution environment
	//! \~russian
	PIStringList environment() { return env; }

	//! \~english Clear current attached execution environment. Call before \a exec()
	//! \~russian
	void clearEnvironment() { env.clear(); }

	//! \~english Remove variable "variable" from current attached execution environment. Call before \a exec()
	//! \~russian
	void removeEnvironmentVariable(const PIString & variable);

	//! \~english Set variable "variable" to "value" in current attached execution environment. Call before \a exec()
	//! \~russian
	void setEnvironmentVariable(const PIString & variable, const PIString & value);

	//! \~english Start attached execution "program" with one argument "arg"
	//! \~russian
	void exec(const PIString & program, const PIString & arg) {
		args.clear();
		args << program << arg;
		exec_();
	}

	EVENT_HANDLER1(void, exec, const PIString &, program) {
		args.clear();
		args << program;
		exec_();
	}
	EVENT_HANDLER2(void, exec, const PIString &, program, const PIStringList &, args_) {
		args.clear();
		args << program << args_;
		exec_();
	}
	EVENT_HANDLER(void, terminate);
	EVENT_HANDLER(bool, waitForFinish);
	EVENT_HANDLER1(bool, waitForFinish, PISystemTime, timeout) { return PIThread::waitForFinish(timeout); }

	EVENT1(execStarted, PIString, program);
	EVENT2(execFinished, PIString, program, int, exit_code);


	//! \~english Start detached execution "program" without arguments
	//! \~russian
	static void execIndependent(const PIString & program) { execIndependent(program, PIStringList()); }

	//! \~english Start detached execution "program" with one argument "arg"
	//! \~russian
	static void execIndependent(const PIString & program, const PIString & arg) { execIndependent(program, PIStringList() << arg); }

	//! \~english Start detached execution "program" with arguments "args"
	//! \~russian
	static void execIndependent(const PIString & program, const PIStringList & args);


	//! \~english Returns application environment
	//! \~russian
	static PIStringList currentEnvironment();

	//! \~english Returns application process ID
	//! \~russian
	static int currentPID();

	//! \~english Returns variable "variable" value from application environment
	//! \~russian
	static PIString getEnvironmentVariable(const PIString & variable);

	//! \handlers
	//! \{

	//! \fn void exec(const PIString & program)
	//! \brief
	//! \~english Start attached execution "program" without arguments
	//! \~russian

	//! \fn void exec(const PIString & program, const PIStringList & args)
	//! \brief
	//! \~english Start attached execution "program" with arguments "args"
	//! \~russian

	//! \fn void terminate()
	//! \brief
	//! \~english Immediately terminate attached execution
	//! \~russian

	//! \fn bool waitForFinish()
	//! \brief
	//! \~english Wait for attached execution finish maximum for 60 seconds
	//! \~russian

	//! \fn bool waitForFinish(PISystemTime timeout)
	//! \brief
	//! \~english Wait for attached execution finish maximum for "timeout_"
	//! \~russian

	//! \}
	//! \events
	//! \{

	//! \fn void execStarted(PIString program)
	//! \brief
	//! \~english Raise on attached execution start
	//! \~russian

	//! \fn void execFinished(PIString program)
	//! \brief
	//! \~english Raise on attached execution finish
	//! \~russian

	//! \}

private:
	void run() override;
	void exec_();
	void startProc(bool detached);
	PIByteArray readFile(PIFile & f, bool clear);

	PRIVATE_DECLARATION(PIP_EXPORT)
	PIStringList args, env;
	PIString wd;
	PIByteArray out;
	PIFile f_in, f_out, f_err;
	bool g_in, g_out, g_err, t_in, t_out, t_err;
	int exit_code;
	bool is_exec;
};

#endif // MICRO_PIP
#endif // PIPROCESS_H