import { describe, expect, it } from "@suaveplan/testing/runner";
import { UNIVERSAL_TAGS } from "./asn1.types.js";
import { decodeGeneralizedTime, decodeUtcTime, encodeTime } from "./time.js";

describe("Time codec", () => {
    it("UTCTime 50/49 split — YY < 50 resolves to 20YY", {
        timeout: 5000,
    }, () => {
        const ms = decodeUtcTime(new TextEncoder().encode("250101000000Z"));
        expect(ms).toBe(Date.UTC(2025, 0, 1));
    });

    it("UTCTime 50/49 split — YY >= 50 resolves to 19YY", {
        timeout: 5000,
    }, () => {
        const ms = decodeUtcTime(new TextEncoder().encode("750101000000Z"));
        expect(ms).toBe(Date.UTC(1975, 0, 1));
    });

    it("GeneralizedTime requires Z", { timeout: 5000 }, () => {
        expect(() =>
            decodeGeneralizedTime(new TextEncoder().encode("20250101000000"))
        ).toThrow();
    });

    it("encodeTime picks UTCTime before 2050", { timeout: 5000 }, () => {
        const out = encodeTime(Date.UTC(2024, 0, 15));
        expect(out.tagNumber).toBe(UNIVERSAL_TAGS.UTC_TIME);
    });

    it("encodeTime picks GeneralizedTime at/after 2050", {
        timeout: 5000,
    }, () => {
        const out = encodeTime(Date.UTC(2055, 0, 15));
        expect(out.tagNumber).toBe(UNIVERSAL_TAGS.GENERALIZED_TIME);
    });
});