// The upstream dump URL lives in two places: the Makefile, which downloads it
// to refresh the committed corpus, and the builder, which stamps it into the
// corpus header and from there into the database. They have to agree, or the
// attribution record names a file nobody downloaded. The docs that quote the
// URL are held to the same copy. The image builds from the committed corpus,
// so the Dockerfile must not download the dump at all.
//
// This lives in the JavaScript suite for no better reason than that it is the
// suite that already reads other files in the repository. It is checking build
// files and docs, not the frontend.

import { readFileSync } from 'node:fs';
import { fileURLToPath } from 'node:url';
import { describe, expect, it } from 'vitest';

const makefile = readFileSync(fileURLToPath(new URL('../../Makefile', import.meta.url)), 'utf8');
const dockerfile = readFileSync(fileURLToPath(new URL('../../Dockerfile', import.meta.url)), 'utf8');

/**
 * @param {string} source
 * @param {RegExp} pattern
 * @param {string} what
 */
function pin(source, pattern, what) {
	const match = source.match(pattern);
	expect(match, `${what} not found`).not.toBeNull();
	return match?.[1].trim();
}

describe('the upstream Wiktionary dump', () => {
	const makeUrl = pin(makefile, /DICT_URL\s*:?=\s*(\S+)/, 'DICT_URL in the Makefile');

	it('is never downloaded by the image build', () => {
		// Only comments may mention Wikimedia; an instruction that does would
		// bring back the network dependency the committed corpus removed.
		const instructions = dockerfile
			.split('\n')
			.filter((line) => !line.trimStart().startsWith('#'))
			.join('\n');
		expect(instructions).not.toContain('dumps.wikimedia.org');
		expect(instructions).toContain('--corpus ./dictionary.txt');
	});

	it('is the rolling pages-articles dump of the Vietnamese Wiktionary edition', () => {
		// The vi edition, not the English one; the current-revisions file, not
		// the full history; and `latest/`, which the owner chose over a dated
		// pin. Any of the three changing is a decision, not a typo.
		expect(makeUrl).toMatch(
			/^https:\/\/dumps\.wikimedia\.org\/viwiktionary\/latest\/viwiktionary-latest-pages-articles\.xml\.bz2$/
		);
	});

	it('is the URL the builder stamps into the database', () => {
		// The builder records the source URL in the corpus header from its own
		// constant. The two copies must agree or the attribution record names
		// a file nobody downloaded.
		const builder = readFileSync(
			fileURLToPath(new URL('../../server/cmd/build-dictionary/dump.go', import.meta.url)),
			'utf8'
		);
		const builderUrl = pin(builder, /dumpSourceURL\s*=\s*"([^"]+)"/, 'dumpSourceURL in the builder');
		expect(builderUrl).toBe(makeUrl);
	});

	it('is the URL the docs quote', () => {
		for (const rel of ['../../README.md', '../../data/ATTRIBUTION.md']) {
			const doc = readFileSync(fileURLToPath(new URL(rel, import.meta.url)), 'utf8');
			expect(doc, `${rel} does not quote DICT_URL`).toContain(makeUrl);
		}
	});
});