#include "vector2.h"
#include <algorithm>
#include <cassert>
#include <iomanip>
#include <iostream>

constexpr float abs_(float x) noexcept { return (x >= 0) ? x : -x; }

constexpr bool fuzzy_equal(float a, float b) noexcept {
	auto max = std::max(abs_(a), abs_(b));
	auto min = std::min(abs_(a), abs_(b));
	if (min == 0) {
		return abs_(max) < 1e-12f;
	}
	return ((max / min) - 1) < 1e-12f;
}

static_assert(fuzzy_equal(1.f, 1.f));
static_assert(!fuzzy_equal(1.f, 1.1f));
static_assert(!fuzzy_equal(0.f, 1.f));
static_assert(!fuzzy_equal(1.f, 0.f));
static_assert(fuzzy_equal(0.1f + 0.2f, 0.3f));

int vector2_main(int, char**) {
	Vector2<float> vec;
	auto print = [](const auto& v) {
		std::cout << "{x: " << v.x << ", y: " << v.y
		          << ", len: " << std::setprecision(14) << v.len
		          << ", dir: " << std::setprecision(14) << v.dir << "}\n";
	};
	print(vec);
	vec.x = 1;
	print(vec);
	assert(fuzzy_equal(vec.dir, 0));
	vec.y += 1;
	print(vec);
	assert(fuzzy_equal(vec.len, std::sqrt(2)));
	vec.len *= 4;
	print(vec);
	assert(fuzzy_equal(vec.x, vec.y));
	vec.x = vec.x + 1;
	print(vec);
	++vec.y;
	print(vec);
	assert(fuzzy_equal(vec.x, vec.y));
	return 0;
}