<?php declare(strict_types = 1);

namespace MailPoet\Newsletter\Sharing;

if (!defined('ABSPATH')) exit;


use InvalidArgumentException;
use MailPoet\Entities\NewsletterEntity;
use MailPoet\Newsletter\NewslettersRepository;
use MailPoet\Newsletter\Sending\SendingQueuesRepository;
use MailPoet\Newsletter\Url as NewsletterUrl;
use MailPoet\Newsletter\ViewInBrowser\ViewInBrowserRenderer;

class PublicEmailController {
  /** @var NewslettersRepository */
  private $newslettersRepository;

  /** @var SendingQueuesRepository */
  private $sendingQueuesRepository;

  /** @var NewsletterUrl */
  private $newsletterUrl;

  /** @var ShareVisibility */
  private $shareVisibility;

  /** @var ViewInBrowserRenderer */
  private $viewInBrowserRenderer;

  /** @var ShareMetadataBuilder */
  private $shareMetadataBuilder;

  public function __construct(
    NewslettersRepository $newslettersRepository,
    SendingQueuesRepository $sendingQueuesRepository,
    NewsletterUrl $newsletterUrl,
    ShareVisibility $shareVisibility,
    ViewInBrowserRenderer $viewInBrowserRenderer,
    ShareMetadataBuilder $shareMetadataBuilder
  ) {
    $this->newslettersRepository = $newslettersRepository;
    $this->sendingQueuesRepository = $sendingQueuesRepository;
    $this->newsletterUrl = $newsletterUrl;
    $this->shareVisibility = $shareVisibility;
    $this->viewInBrowserRenderer = $viewInBrowserRenderer;
    $this->shareMetadataBuilder = $shareMetadataBuilder;
  }

  public function getNewsletter(string $identifier): NewsletterEntity {
    $data = $this->newsletterUrl->parsePublicShareIdentifier($identifier);
    if (!$data) {
      throw new InvalidArgumentException('Invalid public email identifier.');
    }

    $newsletter = $this->newslettersRepository->findOneBy(['hash' => $data['hash']]);
    if (!$newsletter instanceof NewsletterEntity || !$this->shareVisibility->canShare($newsletter)) {
      throw new InvalidArgumentException('Email is not publicly shareable.');
    }

    return $newsletter;
  }

  public function isCanonicalIdentifier(string $identifier, NewsletterEntity $newsletter): bool {
    return $this->normalizeIdentifierForCanonicalComparison($identifier)
      === $this->normalizeIdentifierForCanonicalComparison($this->newsletterUrl->getPublicShareIdentifier($newsletter));
  }

  public function getCanonicalUrl(NewsletterEntity $newsletter): string {
    return $this->newsletterUrl->getPublicShareUrl($newsletter);
  }

  public function render(NewsletterEntity $newsletter): string {
    $queue = $this->sendingQueuesRepository->findLatestCompletedByNewsletter($newsletter);
    $canonicalUrl = $this->getCanonicalUrl($newsletter);
    $html = $this->viewInBrowserRenderer->renderPublicShare($newsletter, $queue);
    $html = $this->shareMetadataBuilder->injectShareToolbar($html, $newsletter, $canonicalUrl);
    return $this->shareMetadataBuilder->injectMetadata($html, $newsletter, $canonicalUrl);
  }

  private function normalizeIdentifierForCanonicalComparison(string $identifier): string {
    // Normalize only URL percent-escape hex digits, e.g. %F0 -> %f0.
    // The slug text remains strict so genuinely stale slugs still redirect.
    $normalized = preg_replace_callback('/%[0-9A-Fa-f]{2}/', function (array $matches): string {
      return strtolower($matches[0]);
    }, $identifier);
    return is_string($normalized) ? $normalized : $identifier;
  }
}