import { describe, expect, it } from "@suaveplan/testing/runner";
import { extraDataMatches } from "./extra-data.js";

function bytewise(a: Uint8Array, b: Uint8Array): boolean {
    if (a.length !== b.length) return false;
    let acc = 0;
    for (let i = 0; i < a.length; i++)
        acc |= (a[i] as number) ^ (b[i] as number);
    return acc === 0;
}

describe("extraDataMatches", () => {
    it("returns true for equal buffers", { timeout: 5000 }, () => {
        const a = new Uint8Array([1, 2, 3, 4]);
        const b = new Uint8Array([1, 2, 3, 4]);
        expect(extraDataMatches(a, b, bytewise)).toBe(true);
    });

    it("returns false for differing content (same length)", {
        timeout: 5000,
    }, () => {
        const a = new Uint8Array([1, 2, 3, 4]);
        const b = new Uint8Array([1, 2, 3, 5]);
        expect(extraDataMatches(a, b, bytewise)).toBe(false);
    });

    it("returns false on length mismatch without calling equal", {
        timeout: 5000,
    }, () => {
        let called = false;
        const fn = () => {
            called = true;
            return true;
        };
        const out = extraDataMatches(
            new Uint8Array([1, 2, 3]),
            new Uint8Array([1, 2]),
            fn
        );
        expect(out).toBe(false);
        expect(called).toBe(false);
    });

    it("returns true on empty buffers", { timeout: 5000 }, () => {
        expect(
            extraDataMatches(new Uint8Array(0), new Uint8Array(0), bytewise)
        ).toBe(true);
    });
});