<?php
/**
 * {{ ansible_managed }}
 *
 * Post-deploy assertion that Skudak mail branding is actually live.
 *
 * WHY THIS EXISTS: SkudakEMailTemplate extends OC\Mail\EMailTemplate, which is
 * Nextcloud's PRIVATE namespace -- no API stability guarantee. Two things can
 * silently switch the branding off:
 *
 *   1. A Nextcloud major upgrade. appinfo/info.xml pins max-version, so the app
 *      is auto-disabled as incompatible; Mailer::createEMailTemplate() then
 *      fails its class_exists() check and falls back to the stock template.
 *      Mail still sends -- unbranded. That is the right failure mode, but it is
 *      invisible without this check.
 *   2. An upstream change to the private base class breaking an override.
 *
 * Renders through Message::useTemplate() -- the REAL path -- rather than
 * calling renderHtml() directly. That distinction is not academic: renderText()
 * runs first and flips the parent's footerAdded flag, and a renderHtml()-only
 * test once passed green while live mail shipped with no footer at all.
 *
 * Exits non-zero with a diagnostic on any failure, so the Ansible task fails
 * the play rather than reporting a clean deploy over broken branding.
 */

require_once '/var/www/html/lib/base.php';

$mailer = \OC::$server->get(\OCP\Mail\IMailer::class);
$dispatcher = \OC::$server->get(\OCP\EventDispatcher\IEventDispatcher::class);

// Mirrors MailService::notifyUnsignedUser() (custom_apps/libresign/lib/Service/MailService.php:85-116).
$template = $mailer->createEMailTemplate('settings.TestEmail');
$template->setSubject('LibreSign: There is a file for you to sign');
$template->addHeader();
$template->addHeading('File to sign', false);
$template->addBodyText('There is a document for you to sign. Access the link below:');
$template->addBodyButton('Sign »verify.pdf«', 'https://{{ cloud_skudak_server_name_new }}/verify');

$message = $mailer->createMessage();
$message->setTo(['verify@example.invalid' => 'Verify']);
$message->useTemplate($template);

// What Mailer::send() does at lib/private/Mail/Mailer.php:186. Nothing is sent.
$dispatcher->dispatchTyped(new \OCP\Mail\Events\BeforeMessageSent($message));

$html = $message->getSymfonyEmail()->getHtmlBody() ?? '';
$text = $message->getPlainBody();
$subject = $message->getSubject();

$inlineNames = [];
foreach ($message->getSymfonyEmail()->getAttachments() as $part) {
	$inlineNames[] = (string)$part->getFilename();
}

$failures = [];

if (!$template instanceof \OCA\Skudakmail\Mail\SkudakEMailTemplate) {
	$failures[] = 'template class is ' . get_class($template)
		. ' -- expected SkudakEMailTemplate. Is the skudakmail app enabled, and does '
		. 'appinfo/info.xml still allow this Nextcloud major?';
}
if (!str_starts_with($subject, 'Skudak LLP')) {
	$failures[] = 'subject not rewritten: ' . $subject;
}
if (!str_contains($html, 'official document-signing request')) {
	$failures[] = 'HTML footer missing (renderText/renderHtml ordering regression?)';
}
if (!str_contains($text, 'official document-signing request')) {
	$failures[] = 'plain-text footer missing';
}
if (!str_contains($html, 'skudak.com/privacy') || !str_contains($html, 'skudak.com/terms')) {
	$failures[] = 'privacy/terms links missing from footer';
}
if (preg_match('/[»«]/u', $html)) {
	$failures[] = 'German guillemets survived into the body';
}
if (!str_contains($html, 'Review document')) {
	$failures[] = 'button label not normalised to "Review document"';
}
if (!str_contains($html, 'cid:skudak-wordmark.png')) {
	$failures[] = 'logo is not a cid: reference -- BeforeMessageSent listener did not fire';
}
if (!in_array('skudak-wordmark.png', $inlineNames, true)) {
	$failures[] = 'inline logo MIME part absent (found: ' . (implode(', ', $inlineNames) ?: 'none') . ')';
}

// ---------------------------------------------------------------------------
// LibreSign signing settings. These live in oc_appconfig (the database), not on
// disk, so they survive container recreation -- but they are re-assertable and
// a stray click in the admin UI can change them silently. GRAPHIC in particular
// matters: any other mode makes SignatureTextService::getSignatureWidth()
// return $current / 2 and stamp a name/date block that duplicates -- and
// collides with -- the one our documents already typeset.
$appConfig = \OC::$server->get(\OCP\IAppConfig::class);

// Must be exactly GRAPHIC_ONLY -- SignerElementsService::RENDER_MODE_GRAPHIC_ONLY.
// The valid set is DESCRIPTION_ONLY / SIGNAME_AND_DESCRIPTION /
// GRAPHIC_AND_DESCRIPTION / GRAPHIC_ONLY. Anything outside it (a bare 'GRAPHIC',
// say) is accepted by occ but matches no radio in the admin UI and falls
// through to default behaviour, so this asserts membership, not just non-empty.
$renderMode = $appConfig->getValueString('libresign', 'signature_render_mode', '');
if ($renderMode !== 'GRAPHIC_ONLY') {
	$failures[] = 'libresign signature_render_mode is "' . $renderMode
		. '" -- expected GRAPHIC_ONLY (signature only). Any other mode halves the '
		. 'stamp width and overlays a duplicate name/date block.';
}

// Read with getValueBool, exactly as FooterHandler:158 does -- asserting the
// string form would pass on a value the app itself reads as true.
if ($appConfig->getValueBool('libresign', 'write_qrcode_on_footer', true) !== false) {
	$failures[] = 'libresign write_qrcode_on_footer is not false -- the validation '
		. 'QR block will be stamped on every page and overlaps the document footer '
		. 'set by skudak-contract.cls. (Was it written without --type=boolean?)';
}

// Signer search for account-owned emails. Both keys are asserted because the
// two failure modes are opposite and the second is the more dangerous:
//   full_match = yes        -> account-owned emails silently unselectable
//   full_match_email = no   -> email signer search disabled ENTIRELY
// Defaults are 'yes' for both (MailPlugin.php:50-55), so an unset
// full_match_email is correct and only an explicit 'no' is a problem.
if ($appConfig->getValueString('core', 'shareapi_restrict_user_enumeration_full_match', 'yes') !== 'no') {
	$failures[] = 'core shareapi_restrict_user_enumeration_full_match is not "no" -- '
		. 'emails belonging to an existing Nextcloud account cannot be added as '
		. 'LibreSign signers (MailPlugin.php:163 aborts the search).';
}
if ($appConfig->getValueString('core', 'shareapi_restrict_user_enumeration_full_match_email', 'yes') === 'no') {
	$failures[] = 'core shareapi_restrict_user_enumeration_full_match_email is "no" -- '
		. 'this disables email signer search ENTIRELY (MailPlugin.php:67). It must be '
		. 'unset or "yes"; it is NOT the knob for the account-owned-email problem.';
}

$identDocs = $appConfig->getValueString('libresign', 'identification_documents', '');
if ($identDocs !== '0') {
	$failures[] = 'libresign identification_documents is "' . $identDocs
		. '" -- expected 0. A non-zero value gates signing behind an ID upload '
		. 'plus admin approval, and signers see no way to sign.';
}

// ---------------------------------------------------------------------------
// Redis: distributed cache + transactional file locking.
//
// These come from the image's config/redis.config.php drop-in, which only
// activates when REDIS_HOST is set on the container. If the env var is lost
// (a container recreated from a stale spec, say), Nextcloud silently reverts
// to DBLockingProvider and every file lock goes back to being a MariaDB write
// -- functional, but the stalls come back with no error anywhere.
$sysConfig = \OC::$server->get(\OCP\IConfig::class);

foreach (['memcache.locking', 'memcache.distributed'] as $key) {
	$value = $sysConfig->getSystemValueString($key, '');
	if ($value !== '\OC\Memcache\Redis') {
		$failures[] = $key . ' is "' . $value . '" -- expected \\OC\\Memcache\\Redis. '
			. 'Is REDIS_HOST still set on the skudak-cloud container?';
	}
}

// Prove Redis is actually reachable and authenticating, not merely configured.
// A wrong password leaves the config looking perfect while every cache and
// lock operation fails at runtime.
try {
	$cacheFactory = \OC::$server->get(\OCP\ICacheFactory::class);
	if (!$cacheFactory->isAvailable()) {
		$failures[] = 'distributed cache reports unavailable -- redis unreachable or auth failed';
	} else {
		$probe = $cacheFactory->createDistributed('skudakmail-verify');
		$probe->set('probe', 'ok', 30);
		if ($probe->get('probe') !== 'ok') {
			$failures[] = 'distributed cache round-trip failed (set/get mismatch)';
		}
		$probe->remove('probe');
	}
} catch (\Throwable $e) {
	$failures[] = 'distributed cache threw: ' . $e->getMessage();
}

if ($failures !== []) {
	fwrite(STDERR, "skudakmail branding verification FAILED:\n");
	foreach ($failures as $f) {
		fwrite(STDERR, "  - $f\n");
	}
	exit(1);
}

echo "skudakmail branding OK (subject: $subject)\n";