#include <iostream>
#include <string>

#include "stack.h"

Stack::Stack() : first{nullptr} {}

std::string Stack::to_string() const
{
    std::string s{"[ "};
    Book* curr{first};
    while ( curr )
    {
	s += curr -> name;
	s += " ";
	curr = curr -> next;
    }
    s += "]";
    return s;
}

void Stack::push(std::string t)
{
    first = new Book{t, first};
}

void Stack::pop()
{
    if( first )
    {
	Book* tmp{first->next};
	first -> next = nullptr;
	delete first;
	first = tmp;
    }
}

std::string Stack::top() const
{
    if( first )
    {
	return first -> name;
    }
    else
    {
	return "Empty";
    }
}