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<?php

declare(strict_types=1);

use Laminas\Validator\Hostname;

require __DIR__ . '/../vendor/autoload.php';

const IANA_URL                        = 'https://data.iana.org/TLD/tlds-alpha-by-domain.txt';
const LAMINAS_HOSTNAME_VALIDATOR_FILE = __DIR__ . '/../src/Hostname.php';

if (! file_exists(LAMINAS_HOSTNAME_VALIDATOR_FILE) || ! is_readable(LAMINAS_HOSTNAME_VALIDATOR_FILE)) {
    printf("Error: cannot read file '%s'%s", LAMINAS_HOSTNAME_VALIDATOR_FILE, PHP_EOL);
    exit(1);
}

if (! is_writable(LAMINAS_HOSTNAME_VALIDATOR_FILE)) {
    printf("Error: cannot update file '%s'%s", LAMINAS_HOSTNAME_VALIDATOR_FILE, PHP_EOL);
    exit(1);
}

/** @psalm-var list<string> $newFileContent */
$newFileContent = [];    // new file content
$insertDone     = false; // becomes 'true' when we find start of $validTlds declaration
$insertFinish   = false; // becomes 'true' when we find end of $validTlds declaration
$checkOnly      = isset($argv[1]) ? $argv[1] === '--check-only' : false;
$response       = getOfficialTLDs();

$currentFileContent = file(LAMINAS_HOSTNAME_VALIDATOR_FILE);

foreach ($currentFileContent as $line) {
    if ($insertDone === $insertFinish) {
        // Outside of $validTlds definition; keep line as-is
        $newFileContent[] = $line;
    }

    if ($insertFinish) {
        continue;
    }

    if ($insertDone) {
        // Detect where the $validTlds declaration ends
        if (preg_match('/^\s+\];\s*$/', $line)) {
            $newFileContent[] = $line;
            $insertFinish     = true;
        }

        continue;
    }

    // Detect where the $validTlds declaration begins
    if (preg_match('/^\s+protected\s+\$validTlds\s+=\s+\[\s*$/', $line)) {
        $newFileContent = array_merge($newFileContent, getNewValidTlds($response));
        $insertDone     = true;
    }
}

if (! $insertDone) {
    printf('Error: cannot find line with "protected $validTlds"%s', PHP_EOL);
    exit(1);
}

if (! $insertFinish) {
    printf('Error: cannot find end of $validTlds declaration%s', PHP_EOL);
    exit(1);
}

if ($currentFileContent === $newFileContent) {
    printf('Nothing to do. Validator has no TLD changes.%s', PHP_EOL);
    exit(0);
}

if ($checkOnly) {
    printf(
        'TLDs must be updated, please run `php bin/update_hostname_validator.php` and push your changes%s',
        PHP_EOL
    );
    exit(1);
}

if (false === @file_put_contents(LAMINAS_HOSTNAME_VALIDATOR_FILE, $newFileContent)) {
    printf('Error: cannot write info file "%s"%s', LAMINAS_HOSTNAME_VALIDATOR_FILE, PHP_EOL);
    exit(1);
}

printf('Validator TLD file updated.%s', PHP_EOL);
exit(0);

/**
 * Get Official TLDs
 */
function getOfficialTLDs(): string
{
    try {
        return file_get_contents(IANA_URL);
    } catch (Throwable $e) {
        printf(
            'Downloading the IANA TLD list failed: %s',
            $e->getMessage(),
        );

        exit(1);
    }
}

/**
 * Extract new Valid TLDs from a string containing one per line.
 *
 * @return list<string>
 */
function getNewValidTlds(string $string): array
{
    $decodePunycode = getPunycodeDecoder();

    // Get new TLDs from the list previously fetched
    $newValidTlds = [];
    foreach (preg_grep('/^[^#]/', preg_split("#\r?\n#", $string)) as $line) {
        $newValidTlds [] = sprintf(
            "%s'%s',\n",
            str_repeat(' ', 8),
            $decodePunycode(strtolower($line))
        );
    }

    return $newValidTlds;
}

/**
 * Retrieve and return a punycode decoder.
 *
 * TLDs are puny encoded.
 *
 * We need a decodePunycode function to translate TLDs to UTF-8:
 *
 * - use idn_to_utf8 if available
 * - otherwise, use Hostname::decodePunycode()
 *
 * @return callable
 */
function getPunycodeDecoder()
{
    if (function_exists('idn_to_utf8')) {
        return function ($domain) {
            return idn_to_utf8($domain, 0, INTL_IDNA_VARIANT_UTS46);
        };
    }

    $hostnameValidator = new Hostname();
    $reflection        = new ReflectionClass($hostnameValidator::class);
    $decodePunyCode    = $reflection->getMethod('decodePunycode');

    return function ($encode) use ($hostnameValidator, $decodePunyCode) {
        if (strpos($encode, 'xn--') === 0) {
            return $decodePunyCode->invokeArgs($hostnameValidator, [substr($encode, 4)]);
        }
        return $encode;
    };
}