#ifndef _STATE_H_
#define _STATE_H_
#include <iostream>
#include <string>

class State {
protected:
	virtual void run (std::string input, std::string& output)=0;
	virtual State* newState ()=0;
	friend class StateControl;
};

/************************************
 *		Implementation details		*
 ************************************
   
// Each state should be like:
class SomeState : public State {
	// Singleton object
	static SomeState state;
protected:
	// This is where all computation should be
	virtual void run (std::string input, std::string& output);
	// This is the method that knows when to change states
	virtual State* newState (); // Return new state or itself
public:
	// Singleton cosntructor
	static SomeState* Instance();
	SomeState ();
};

// The StateControl should be like:
class StateControl {
	std::string input;
	State* currentState;
public:
	StateControl () {
		// There must be an initial state
		this->currentState = (State*) InitialState::Instance();
	}
	bool setInput (std::string in) {
		// This could be a lot different by reading the input itself
		this->input = in;
	}
	void run (std::string& result) {
		// Run
		this->currentState->run(this->input, result);
		// And change state, if need to
		this->currentState = this->currentState->newState();
	}
};


*/

#endif // _STATE_H_