/*! \file pistatemachine_transition.h
 * \ingroup StateMachine
 * \~\brief
 * \~english State machine transition
 * \~russian Переход машины состояний
 */
/*
    PIP - Platform Independent Primitives
	State machine transition
    Ivan Pelipenko peri4ko@yandex.ru, Andrey Bychkov work.a.b@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 pistatemachine_transition_H
#define pistatemachine_transition_H

#include "pistatemachine_base.h"
#include "pitimer.h"


//! \ingroup StateMachine
//! \~\brief
//! \~english
//! \~russian
class PIP_EXPORT PITransitionBase {
	friend class PIStateMachine;
	friend class PIStateBase;

public:
	PITransitionBase(PIStateBase * source, PIStateBase * target, int event_id);
	virtual ~PITransitionBase();

	PIStateMachine * machine() const { return root; }
	PIStateBase * source() const { return source_state; }
	PIStateBase * target() const { return target_state; }

	template<typename R, typename... Args>
	PITransitionBase * addGuard(std::function<R(Args...)> f) {
		static_assert(std::is_same<R, bool>::value, "guard function should return bool!");
		piDeleteSafety(guard);
		guard = PIStateMachineHelpers::makeFunction(f);
		return this;
	}

	template<typename L>
	PITransitionBase * addGuard(L f) {
		return addGuard(toStdFunction(f));
	}

	template<typename... Args>
	bool testGuard(Args... args) {
		if (!guard) return true;
		if (guard->formatHash() != PIStateMachineHelpers::Function<Args...>().formatHash()) {
			piCout << "invalid arguments format!";
			return false;
		}
		return reinterpret_cast<PIStateMachineHelpers::Function<Args...> *>(guard)->func(args...);
	}

	PITransitionBase * addAction(std::function<void()> a);
	void makeAction();

	void trigger();

protected:
	virtual void enabled() {}
	virtual void disabled() {}

	int eventID               = 0;
	PIStateBase *source_state = nullptr, *target_state = nullptr;
	PIStateMachine * root                       = nullptr;
	PIStateMachineHelpers::FunctionBase * guard = nullptr;
	std::function<void()> action;
};


class PIP_EXPORT PITransitionTimeout: public PITransitionBase {
public:
	PITransitionTimeout(PIStateBase * source, PIStateBase * target, PISystemTime timeout);
	~PITransitionTimeout();

private:
	void enabled() override;
	void disabled() override;

	PITimer timer;
};

#endif