#pragma once

/**
 * \file VarInt.h
 * \brief File containing the sp::VarInt class
 */

#include <cstddef>
#include <cstdint>
#include <ostream>
#include <sp/protocol/Field.h>

namespace sp {

class DataBuffer;

/**
 * \class VarInt
 * \brief Variable-length format such that smaller numbers use fewer bytes.
 */
class VarInt {
  private:
	std::uint64_t m_Value;

  public:
	static const std::uint64_t MAX_VALUE = static_cast<std::uint64_t>(-1) >> 8;

	VarInt() : m_Value(0) {}
	/**
	 * \brief Construct a variable integer from a value
	 * \param value The value of the variable integer
	 */
	VarInt(std::uint64_t value) : m_Value(value) {}

	/**
	 * \brief Get the value of the variable integer
	 */
	std::uint64_t GetValue() const {
		return m_Value;
	}

	/**
	 * \brief Get the length of the serialized variable integer
	 */
	std::size_t GetSerializedLength() const;

	/**
	 * \brief Serialize the variable integer
	 * \param out The buffer to write the serialized variable integer to
	 * \param var The variable integer to serialize
	 */
	friend DataBuffer& operator<<(DataBuffer& out, const VarInt& var);

	/**
	 * \brief Deserialize the variable integer
	 * \param in The buffer to read the serialized variable integer from
	 * \param var The variable integer to deserialize
	 */
	friend DataBuffer& operator>>(DataBuffer& in, VarInt& var);

	friend std::ostream& operator<<(std::ostream& a_Stream, const PrintableField<VarInt>& a_VarInt);
};

}  // namespace sp