#include <iostream>
#include <string>

#include "queue.h"

Queue::Queue() : first{nullptr} {}

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

void Queue::enqueue(std::string t)
{
    if ( first == nullptr)
    {
	first = new Task{t, first};
    }
    else
    {
	Task* curr{first};
	while ( curr -> next )
	{
	    curr = curr -> next;
	}
	curr -> next = new Task{t, nullptr};
    }
}

void Queue::dequeue()
{
    if( first )
    {
	Task* tmp{first->next};
	first -> next = nullptr;
	delete first;
	first = tmp;
    }
}

void Queue::execute()
{
    if (first)
    {
	std::cout << first->task << std::endl;
	dequeue();
    }
    else
    {
	std::cout << "Queue is empty, no task to run" << std::endl;
    }
}