import { describe, it } from 'node:test';
import assert from 'node:assert/strict';

import { parseNextLink } from '../src/webex/client.js';

// RFC-5988 Link headers: webexListAll walks these to page through big
// list endpoints (locations, users, etc). If this parser breaks silently,
// list calls only return the first page.
describe('parseNextLink', () => {
    it('extracts the URL from a next-only Link header', () => {
        const header = '<https://webexapis.com/v1/people?cursor=abc>; rel="next"';
        assert.equal(parseNextLink(header), 'https://webexapis.com/v1/people?cursor=abc');
    });

    it('picks the next rel out of a multi-rel header', () => {
        const header =
            '<https://webexapis.com/v1/people?cursor=abc>; rel="next", ' +
            '<https://webexapis.com/v1/people?cursor=first>; rel="first"';
        assert.equal(parseNextLink(header), 'https://webexapis.com/v1/people?cursor=abc');
    });

    it('accepts unquoted rel values', () => {
        const header = '<https://webexapis.com/v1/people?cursor=xyz>; rel=next';
        assert.equal(parseNextLink(header), 'https://webexapis.com/v1/people?cursor=xyz');
    });

    it('returns null when there is no next rel', () => {
        const header =
            '<https://webexapis.com/v1/people?cursor=prev>; rel="prev", ' +
            '<https://webexapis.com/v1/people?cursor=first>; rel="first"';
        assert.equal(parseNextLink(header), null);
    });

    it('returns null for missing / empty headers', () => {
        assert.equal(parseNextLink(null), null);
        assert.equal(parseNextLink(undefined), null);
        assert.equal(parseNextLink(''), null);
    });
});