const { test, expect, describe } = require('bun:test');
const crypto = require('crypto');
const { MEMBER_URN_PREFIX, PARTICIPATION_SECRET, participationSecretOf, memberUrn } = require('./member-urn');

const BOB = 'http://localhost:3000/bob';
const CAROL = 'http://localhost:3000/carol';
const EVENT = 'http://localhost:3000/alice/data/events/e1';
const OTHER_EVENT = 'http://localhost:3000/alice/data/events/e2';
const SECRET = '0123456789abcdef'.repeat(4);

describe('memberUrn — urn:festipod:userref:<sha256("<WebID> <event URI> <secret>")>', () => {
  test('the contract: the lowercase-hex sha256 of the three values joined by single spaces', () => {
    const expected = crypto.createHash('sha256').update(`${BOB} ${EVENT} ${SECRET}`).digest('hex');
    expect(memberUrn({ participantUri: BOB, eventUri: EVENT, secret: SECRET })).toBe(`urn:festipod:userref:${expected}`);
    expect(MEMBER_URN_PREFIX).toBe('urn:festipod:userref:');
    expect(memberUrn({ participantUri: BOB, eventUri: EVENT, secret: SECRET })).toMatch(/^urn:festipod:userref:[0-9a-f]{64}$/);
  });

  test('deterministic for one person and one event; different for another event, person or secret', () => {
    const base = { participantUri: BOB, eventUri: EVENT, secret: SECRET };
    const urn = memberUrn(base);
    expect(memberUrn({ ...base })).toBe(urn);
    expect(memberUrn({ ...base, eventUri: OTHER_EVENT })).not.toBe(urn);
    expect(memberUrn({ ...base, participantUri: CAROL })).not.toBe(urn);
    expect(memberUrn({ ...base, secret: 'f'.repeat(64) })).not.toBe(urn);
  });

  test('a missing value is a programming error, never a URN', () => {
    expect(() => memberUrn({ participantUri: BOB, eventUri: undefined, secret: SECRET })).toThrow('eventUri');
    expect(() => memberUrn({ participantUri: BOB, eventUri: EVENT, secret: '' })).toThrow('secret');
  });
});

describe('participationSecretOf — 64 lowercase hex characters under fp:participationSecret, or nothing', () => {
  test('read under the full IRI, the CURIE, or as a value node', () => {
    expect(PARTICIPATION_SECRET).toBe('http://festipod.org/participationSecret');
    expect(participationSecretOf({ [PARTICIPATION_SECRET]: SECRET })).toBe(SECRET);
    expect(participationSecretOf({ 'fp:participationSecret': SECRET })).toBe(SECRET);
    expect(participationSecretOf({ [PARTICIPATION_SECRET]: { '@value': SECRET } })).toBe(SECRET);
    expect(participationSecretOf({ [PARTICIPATION_SECRET]: [SECRET] })).toBe(SECRET);
  });

  test('absent, malformed or ambiguous: no secret', () => {
    for (const value of [undefined, '', SECRET.toUpperCase(), SECRET.slice(1), `${SECRET}0`, 'g'.repeat(64), 42, { id: SECRET }, [SECRET, 'f'.repeat(64)]]) {
      expect(participationSecretOf({ [PARTICIPATION_SECRET]: value })).toBeUndefined();
    }
    expect(participationSecretOf(undefined)).toBeUndefined();
    expect(participationSecretOf({ name: 'Bob' })).toBeUndefined();
  });
});