<?php

/**
 * German and English carry the same keys.
 *
 * R16. A key added to one language and forgotten in the other does not fail
 * anywhere — Laravel prints the key itself — so it ships, and then surfaces as
 * `admin_settings.update_phase.migrate` in the middle of a sentence on whichever
 * language nobody was testing in.
 */

/** @return array<int, string> every key in a translation array, dotted. */
function flattenKeys(array $lines, string $prefix = ''): array
{
    $keys = [];

    foreach ($lines as $key => $value) {
        $path = $prefix === '' ? (string) $key : $prefix.'.'.$key;

        // Only nested arrays recurse. A list of strings — a bullet list in the
        // interface — is one key whose shape is the translator's business.
        if (is_array($value) && ! array_is_list($value)) {
            $keys = [...$keys, ...flattenKeys($value, $path)];

            continue;
        }

        $keys[] = $path;
    }

    sort($keys);

    return $keys;
}

it('has the same keys in German and English', function () {
    $files = array_map(
        fn (string $path) => basename($path),
        glob(lang_path('de/*.php')) ?: [],
    );

    expect($files)->not->toBeEmpty();

    foreach ($files as $file) {
        $de = require lang_path('de/'.$file);
        $enPath = lang_path('en/'.$file);

        expect(file_exists($enPath))->toBeTrue("lang/en/{$file} is missing");

        $en = require $enPath;

        $missingInEn = array_diff(flattenKeys($de), flattenKeys($en));
        $missingInDe = array_diff(flattenKeys($en), flattenKeys($de));

        expect($missingInEn)->toBe([], "missing in lang/en/{$file}: ".implode(', ', $missingInEn));
        expect($missingInDe)->toBe([], "missing in lang/de/{$file}: ".implode(', ', $missingInDe));
    }
});