#include "vector.hpp"

template<class T>
class RingBuffer
{
private:
	Vector<T> data;
	std::size_t head, tail;

	void AdvanceHead()
	{
		++head;
		if(head >= data.GetSize())
		{
			head = 0;
		}
	}

	void AdvanceTail()
	{
		++tail;
		if(tail >= data.GetSize())
		{
			tail = 0;
		}
		if(tail == head)
		{
			AdvanceHead();
		}
	}

public:
	void Push(const T value)
	{
		data[tail] = value;
		AdvanceTail();
	}

	T Pop()
	{
		if(head == tail)
		{
			throw std::out_of_range("Cannot retrieve value when size is 0");
		}

		T const & toReturn = data[head];
		AdvanceHead();
		return toReturn;
	}

	std::size_t GetSize() const
	{
		if(head <= tail)
		{
			return tail - head;
		}
		else
		{
			return tail + (data.GetSize() - head);
		}
	}

	bool IsEmpty() const
	{
		return head == tail;
	}

	RingBuffer(std::size_t const size)
		: data(),
		head(0),
		tail(0)
	{
		data.Resize(size + 1ul);
	}
};