#pragma once

#include <cstddef>
#include <cstdint>
#include <functional>

struct Vector2Options
{
	std::int32_t x;
	std::int32_t y;
};

/**
 * A 2D Vector.
 */
class Vector2
{
public:
	using Value = std::int32_t;

	constexpr explicit Vector2(const Vector2Options &options) noexcept
		: _x(options.x), _y(options.y)
	{
	}

	[[nodiscard]] auto get_x() const noexcept -> Value;

	void set_x(Value x) noexcept;

	[[nodiscard]] auto get_y() const noexcept -> Value;

	void set_y(Value y) noexcept;

	[[nodiscard]] auto
	to_direction(const Vector2 &direction, Vector2::Value amount) const noexcept
		-> Vector2;

	auto operator+=(const Vector2 &rhs) noexcept -> const Vector2 &;
	auto operator-=(const Vector2 &rhs) noexcept -> const Vector2 &;

	auto operator+(const Vector2 &rhs) const noexcept -> Vector2;
	auto operator-(const Vector2 &rhs) const noexcept -> Vector2;
	auto operator*(const Vector2 &rhs) const noexcept -> Vector2;

	auto operator==(const Vector2 &rhs) const noexcept -> bool;
	auto operator!=(const Vector2 &rhs) const noexcept -> bool;

	auto operator<(const Vector2 &rhs) const noexcept -> bool;
	auto operator>(const Vector2 &rhs) const noexcept -> bool;

	auto operator<=(const Vector2 &rhs) const noexcept -> bool;
	auto operator>=(const Vector2 &rhs) const noexcept -> bool;

	/**
	 *  Returns Vector2({.x = 0, .y = 1})
	 */
	static constexpr auto up() noexcept -> Vector2
	{
		return Vector2({.x = 0, .y = 1});
	}

	/**
	 *  Returns Vector2({.x = 0, .y = -1})
	 */
	static constexpr auto down() noexcept -> Vector2
	{
		return Vector2({.x = 0, .y = -1});
	}

	/**
	 *  Returns Vector2({.x = -1, .y = 0})
	 */
	static constexpr auto left() noexcept -> Vector2
	{

		return Vector2({.x = -1, .y = 0});
	}

	/**
	 *  Returns Vector2({.x = 1, .y = 0})
	 */
	static constexpr auto right() noexcept -> Vector2
	{
		return Vector2({.x = 1, .y = 0});
	}

private:
	Value _x;
	Value _y;
};

class Vector2Hasher
{
public:
	auto operator()(const Vector2 &vector2) const noexcept -> std::size_t;
};