import { expect, test } from "vitest";
import { decideMovie, paretoFilter } from "../../src/shared/algorithm.ts";

test("paretoFilter removes dominated movies", () => {
	const movies = ["A", "B"];
	const people = ["P1", "P2"];
	const ratings = { P1: { A: 1, B: 3 }, P2: { A: 2, B: 4 } };
	expect(paretoFilter(movies, people, ratings)).toEqual(["B"]);
});

test("nash protects against hard no", () => {
	const movies = ["Consensus", "Polarizing"];
	const people = ["A", "B", "C"];
	const ratings = {
		A: { Consensus: 3, Polarizing: 5 },
		B: { Consensus: 3, Polarizing: 5 },
		C: { Consensus: 3, Polarizing: 0 },
	};
	const result = decideMovie({ movies, people, ratings });
	expect(result.winner.movie).toBe("Consensus");
});

test("tie-breaker uses alphabetical order", () => {
	const movies = ["Alpha", "Beta"];
	const people = ["A", "B"];
	const ratings = {
		A: { Alpha: 2, Beta: 2 },
		B: { Alpha: 2, Beta: 2 },
	};
	const result = decideMovie({ movies, people, ratings });
	expect(result.winner.movie).toBe("Alpha");
});