#include <iostream>
#include <fstream>
#include "front.h"
using namespace std;
front::front()
{
	pocetU=0, p_inv=0,suma=0;
}

bool front::isPNode()
{
	popis * priv1;
	for(priv1=p_inv;priv1!=NULL;priv1=priv1->next)
	{
		if(priv1->transakcia=='P')
		{
			return true;
		}
		else
		{
			return false;
		}
	}
	}



void front::push(char tp, char pct, int trs, int cna)
{
	popis * priv1, * priv2;

	if(p_inv == 0)
	{
		p_inv=new popis;
		p_inv->typ=tp;
		p_inv->pocet=pct;
		p_inv->transakcia=trs;
		p_inv->cena=cna;
		p_inv->next=0;
	}
	else
		{
		priv1=p_inv;
		while(priv1->next != 0)
			{
			priv1=priv1->next;
			}
		priv2=new popis;
		priv2->typ=tp;
		priv2->pocet=pct;
		priv2->transakcia=trs;
		priv2->cena=cna;
		priv2->next=0;
		priv1->next=priv2;
		}
	pocetU++;
}
void front::inventar()
{
	popis * priv1;
	for(priv1=p_inv;priv1!=NULL;priv1=priv1->next)
	{
		cout << "typ polozky:\t\t\t" << priv1->typ << endl;
		cout << "pocet prvkov polozky:\t\t" << priv1->pocet << endl;
		cout << "transakcia:\t\t\t" << priv1->transakcia << endl;
		cout << "cena jedneho prvku polozky:\t" << priv1->cena << endl;
	}
}
void front::write()
{
	ofstream fw;
	fw.open("inventory.txt", ios::app);
	popis * priv1;
	for(priv1=p_inv;priv1!=NULL;priv1=priv1->next)
	{
		fw << priv1->typ;
		fw << priv1->transakcia<<" ";
		fw << priv1->pocet<<" ";
		fw << priv1->cena<<endl;
	}
	fw.close();
}

void front::stats()
{
	int cislo;
	suma=0;
	popis * priv1;
	for(priv1=p_inv;priv1!=NULL;priv1=priv1->next)
	{
		cout << "typ polozky:\t\t\t" << priv1->typ << endl;
		cout << "pocet prvkov polozky:\t\t" << priv1->pocet << endl;
		cout << "transakcia:\t\t\t" << priv1->transakcia << endl;
		cout << "cena jedneho prvku polozky:\t" << priv1->cena << endl;
		cislo=priv1->pocet * priv1->cena;
		suma += cislo; //cislo+cislo
		cout << "do kopy:\t\t\t"<<suma<<endl;
		cout << "***********koniec vypisu statistiky*******"<<endl;
	}
}

void front::pop(float pocet)
{
    int cyklus= 0;                                   // premenna i urcuje kolkaty cyklus sa spracuvava
	float result;
	float temp=0.0;
    system("cls");
	popis * priv1 = p_inv;
	popis *	priv2;
	popis * priv3 = p_inv;
	priv2 = p_inv;
	int i = 0;
	while(priv3 != NULL)
	{
		//cout<< i++ << endl;
		temp=temp+priv3->pocet;
		priv3 = priv3->next;
	}
	if ((int)temp<(int)pocet)
	{
		cout<<"GRESKA"<<endl;
		return;
	}
	if(priv1== NULL)
		cout << "nista";
	else
	{
		while(priv1->next != NULL)
			priv1 = priv1->next;
		result = priv1->pocet - pocet;
		 
		if(result < 0)
		{
			
				
			priv1 =p_inv;
			priv1 = priv2->next;
			while(priv1->next != NULL)
			{
				priv2 = priv1;
				priv1 = priv1->next;

			}
			priv2->next = NULL;
			delete priv1;
			pop((-1)*result);
				
		}
		else if(result == 0)
		{
			
			priv2 =p_inv;
			priv1 = priv2->next;
			if(priv2->next == NULL)
			{
				pocetU = 0 ;
				delete priv1;
				delete priv2;
				
				return;
			}
			while(priv1->next != NULL)
			{
				priv2 = priv1;
				priv1 = priv1->next;

			}

			priv2->next = NULL;
			delete priv1;
		}
		else
		{
			priv1 = p_inv;
			while(priv1->next != NULL)
				priv1 = priv1->next;
			priv1->pocet = result;

		}


	}

}