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")
})