// Menu.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
using namespace std;

#include "WString.h"
#include "math.h"
#include "DVector.h"

double f_exp(double x, double epsi)
{
	    double stx,fakt,ex;
		int i;

		stx=x;
        fakt=1;
        ex=1;
        i=1;
        while (stx/fakt>=epsi)
		{
           ex=ex+stx/fakt;
		   i++;
           stx=stx*x;
           fakt=fakt*i;
		}

		return ex;
}


class WMenuFunction
{
public:
	WMenuFunction(){name = "default";};
	virtual void execute(bool *exit){};
	virtual void printf_name(){name.m_printf();};
    virtual void set_name(WString str){name = str;}

private:
    WString name;


};

class w_exp: public WMenuFunction
{
public:
	w_exp(){name = "e^x at point"; set_name(name);}
	void execute(bool *exit)
	{
		system("cls");
		printf_name();
		cout<<"------------------"<<endl;
		double x,y,epsi;
		cout<<"Enter x"<<endl;
		cin>>x;
		cout<<"Enter determ value"<<endl;
		cin>>epsi;
		cout<<"Result is: "<<endl;		
		y = f_exp(x,epsi);
		cout<<"y = "<<y<<endl;
		cout<<"------------------"<<endl;
		cout<<"Press any key ;)"<<endl;
		_getch();
	}
private:
	WString name;
};

class w_exp_r: public WMenuFunction
{
public:
	w_exp_r(){name = "e^x at range"; set_name(name);}
	void execute(bool *exit)
	{
		system("cls");
		printf_name();
		cout<<"------------------"<<endl;

		double xs,xe;
		int j,step;
		cout<<"Enter start x"<<endl;
		cin>>xs;
		cout<<"Enter end x"<<endl;
		cin>>xe;
		cout<<"Enter step size"<<endl;
		cin>>step;

		double x,y,epsi;
		
		cout<<"Enter determ value"<<endl;
		cin>>epsi;

		cout<<"Result is: "<<endl;

		for(j = xs; j<xe; j+=step)
		{		
		y = f_exp(j,epsi);
		cout<<"y("<<j<<") = "<<y<<endl;
		}

		cout<<"------------------"<<endl;
		cout<<"Press any key ;)"<<endl;
		_getch();
	}
private:
	WString name;
};
class w_sqrt: public WMenuFunction
{
public:
	w_sqrt(){name = "x^2 at point"; set_name(name);}
	void execute(bool *exit)
	{
		system("cls");
		printf_name();
		cout<<"------------------"<<endl;
		double x,y;
		cout<<"Enter x"<<endl;
		cin>>x;
		cout<<"Result is: "<<endl;
		y = pow(x,2.0);
		cout<<"y = "<<y<<endl;
		cout<<"------------------"<<endl;
		cout<<"Press any key ;)"<<endl;
		_getch();
	}
private:
	WString name;
};

class w_sqrt_r: public WMenuFunction
{
public:
	w_sqrt_r(){name = "x^2 at range"; set_name(name);}
	void execute(bool *exit)
	{
		system("cls");
		printf_name();
		cout<<"------------------"<<endl;
		double xs,xe;
		int j,step;
		cout<<"Enter start x"<<endl;
		cin>>xs;
		cout<<"Enter end x"<<endl;
		cin>>xe;
		cout<<"Enter step size"<<endl;
		cin>>step;


		double x,y;
		cout<<"Result is: "<<endl;

		for(j = xs; j<xe; j+=step)
		{		
		y = pow(j,2.0);
		cout<<"y("<<j<<") = "<<y<<endl;
		}
		cout<<"------------------"<<endl;
		cout<<"Press any key ;)"<<endl;
		_getch();
	}
private:
	WString name;
};


class w_iext: public WMenuFunction
{
public:
	w_iext(){name = "Exit"; set_name(name);}
    void execute(bool *exit){*exit = true;}
private:
	WString name;

};

class WMenu : public WMenuFunction
{
public:
	WMenu(int m, WMenuFunction** mas,char* Name):obj(m,mas)
	{
		name = Name;
		set_name(name);
		selected = 0;
		enter=false;
		redraw = false;
		EXIT = false;

		int i;
		obj.SetSize(m+1);
		for(i=0;i<m;i++)
		{
			obj.loadvector(i,mas[i]);
		}
		obj.loadvector(i,NULL);

	};
	

	void execute(bool *exit)
	{
		EXIT = *exit;
		
		while(!EXIT)
	{
		system("cls");
		cout <<"                         ";
		name.m_printf();
		
		printf("==========================================================================\n");
		

		for(int i=0; i<obj.GetSize()-1; i++)
		{
			if (i==selected)
			{
				printf("--------------------------------------------------------------------------\n");
				obj[i]->printf_name(); //printf("\n");
				printf("--------------------------------------------------------------------------\n");
				if(enter){obj[i]->execute(&EXIT); enter = false; redraw = true;}else{redraw = false;}
			}else{printf("\n"); obj[i]->printf_name(); printf("\n");}
		}

		if((!EXIT)&&(!redraw))
		{
		key = _getch();
		if ((key == 0x50)&&(selected < obj.GetSize()-2)) selected++;
		if ((key == 0x48)&&(selected > 0)) selected--;
		if (key == 13){enter = true;}
		}
		

		}




	}
private:
	WString name;
	Vector <WMenuFunction*> obj;
	int key,selected,redraw;
	bool enter,EXIT;
};






void main()
{
	setlocale(LC_ALL,".1251");

	int h = 3;
	w_sqrt fDoubleUpX;
	w_sqrt_r fDoubleUpXrange;
	w_exp  fExpX;
	w_exp_r  fExpXrange;
	w_iext fExit;
	


	h = 3;
	WMenuFunction** fExpXmenu=new WMenuFunction*[h];
	fExpXmenu[0]=&fExpX;
	fExpXmenu[1]=&fExpXrange;
	fExpXmenu[2]=&fExit;	
	WMenu MenuExponenta(h,fExpXmenu,"Exponenta");

	h = 3;
	WMenuFunction** fMnchXmenu=new WMenuFunction*[h];
	fMnchXmenu[0]=&fDoubleUpX;
	fMnchXmenu[1]=&fDoubleUpXrange;
	fMnchXmenu[2]=&fExit;	
	WMenu MenuPolinom(h,fMnchXmenu,"Polinom");
	

	h = 3;
	WMenuFunction** Menu1_Func=new WMenuFunction*[h];
	Menu1_Func[0]=&MenuPolinom;
	Menu1_Func[1]=&MenuExponenta;
	Menu1_Func[2]=&fExit;
	WMenu Menu(h,Menu1_Func,"Welcome to Function Culc");


	bool ex=false;
	Menu.execute(&ex);
}