import { expect, test } from "vitest";
import { type AABB, vec } from "./given.ts";
import { moveAndSlide } from "./moveAndSlide.ts";

const player: AABB = { x: 0, y: 0, w: 2, h: 2 };

test("no walls -> full move", () => {
	const p = moveAndSlide(player, vec(10, 5), []);
	expect(p.x).toBeCloseTo(10);
	expect(p.y).toBeCloseTo(5);
});

test("head-on into the NEAREST of two walls -> stops there", () => {
	const walls: AABB[] = [
		{ x: 5, y: 0, w: 2, h: 2 }, // nearer
		{ x: 8, y: 0, w: 2, h: 2 }, // farther
	];
	const p = moveAndSlide(player, vec(10, 0), walls);
	expect(p.x).toBeCloseTo(3); // right edge (2) meets wall left edge (5)
	expect(p.y).toBeCloseTo(0);
});

test("diagonal into a vertical wall -> slides down it", () => {
	// x is blocked at 3, but the downward motion keeps going for the whole frame
	const walls: AABB[] = [{ x: 5, y: -10, w: 2, h: 40 }];
	const p = moveAndSlide(player, vec(10, 10), walls);
	expect(p.x).toBeCloseTo(3);
	expect(p.y).toBeCloseTo(10);
});

test("diagonal onto a floor -> slides along it", () => {
	// falls until its bottom meets the floor top (y=8 -> corner y=6), keeps moving in x
	const walls: AABB[] = [{ x: 0, y: 8, w: 20, h: 2 }];
	const p = moveAndSlide(player, vec(5, 10), walls);
	expect(p.x).toBeCloseTo(5);
	expect(p.y).toBeCloseTo(6);
});