<?php

declare(strict_types=1);

namespace App\Command;

use App\Exception\NewsletterProviderException;
use App\Service\MailjetApiClient;
use Psr\Log\LoggerInterface;
use Symfony\Component\Console\Attribute\AsCommand;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Style\SymfonyStyle;
use Symfony\Component\DependencyInjection\Attribute\Autowire;

#[AsCommand(
    name: 'app:mailjet:newsletter-webhook',
    description: 'Creates or deletes the Mailjet newsletter webhook',
)]
final class MailjetNewsletterWebhookCommand extends Command
{
    private const string ACTION_REGISTER = 'register';
    private const string ACTION_REMOVE = 'remove';
    private const string ACTION_DEACTIVATE = 'deactivate';
    private const string EVENT_TYPE_UNSUBSCRIBE = 'unsub';
    private const string WEBHOOK_BASIC_AUTH_USER = 'mailjet';
    private const string WEBHOOK_PATH = '/webhooks/mailjet/newsletter';
    private const int WEBHOOK_VERSION = 2;

    public function __construct(
        private readonly MailjetApiClient $mailjetApiClient,
        #[Autowire(env: 'APP_BASE_URL')]
        private readonly string $defaultBaseUrl,
        #[Autowire(env: 'MAILJET_WEBHOOK_BASIC_PASSWORD')]
        private readonly string $basicAuthPassword,
        private readonly LoggerInterface $logger,
    ) {
        parent::__construct();
    }

    protected function configure(): void
    {
        $this
            ->addArgument('action', InputArgument::REQUIRED, 'One of: register, remove, deactivate')
            ->addArgument('callback_id', InputArgument::OPTIONAL, 'Callback ID required for remove/deactivate')
            ->addOption('url', null, InputOption::VALUE_REQUIRED, 'Override the webhook URL to register before Basic Auth credentials are added');
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $io = new SymfonyStyle($input, $output);
        $action = strtolower(trim((string) $input->getArgument('action')));

        try {
            return match ($action) {
                self::ACTION_REGISTER => $this->register($io, $input->getOption('url')),
                self::ACTION_REMOVE, self::ACTION_DEACTIVATE => $this->remove($io, $input->getArgument('callback_id')),
                default => $this->invalidAction($io, $action),
            };
        } catch (NewsletterProviderException|\InvalidArgumentException $exception) {
            $this->logger->error('Mailjet newsletter webhook command failed', [
                'action' => $action,
                'error' => $exception->getMessage(),
            ]);

            $io->error($exception->getMessage());

            return Command::FAILURE;
        }
    }

    private function register(SymfonyStyle $io, mixed $overrideUrl): int
    {
        $webhookUrl = $this->resolveWebhookUrl($overrideUrl);
        $authenticatedWebhookUrl = $this->prependBasicAuth($webhookUrl);
        $payload = $this->mailjetApiClient->createEventCallbackUrl(self::EVENT_TYPE_UNSUBSCRIBE, $authenticatedWebhookUrl, self::WEBHOOK_VERSION);

        $io->success(sprintf('Created Mailjet newsletter webhook at %s.', $authenticatedWebhookUrl));
        $io->writeln($this->formatPayload($payload));

        return Command::SUCCESS;
    }

    private function remove(SymfonyStyle $io, mixed $callbackId): int
    {
        $resolvedCallbackId = $this->resolveCallbackId($callbackId);
        $this->mailjetApiClient->deleteEventCallbackUrl($resolvedCallbackId);

        $io->success(sprintf('Deleted Mailjet newsletter webhook callback ID %d.', $resolvedCallbackId));

        return Command::SUCCESS;
    }

    private function invalidAction(SymfonyStyle $io, string $action): int
    {
        $io->error(sprintf('Unknown action "%s". Use register, remove, or deactivate.', $action));

        return Command::FAILURE;
    }

    private function resolveWebhookUrl(mixed $override): string
    {
        if (true === is_string($override) && '' !== trim($override)) {
            $url = trim($override);
            if (false === filter_var($url, FILTER_VALIDATE_URL)) {
                throw new \InvalidArgumentException('The provided webhook URL is not valid.');
            }

            return rtrim($url, '/');
        }

        if ('' === trim($this->defaultBaseUrl)) {
            throw new \InvalidArgumentException('APP_BASE_URL is not configured.');
        }

        return rtrim(trim($this->defaultBaseUrl), '/').self::WEBHOOK_PATH;
    }

    private function prependBasicAuth(string $url): string
    {
        if ('' === trim($this->basicAuthPassword)) {
            throw new \InvalidArgumentException('MAILJET_WEBHOOK_BASIC_PASSWORD is not configured.');
        }

        $parts = parse_url($url);
        if (false === is_array($parts) || false === isset($parts['scheme'], $parts['host'])) {
            throw new \InvalidArgumentException('The webhook URL is not valid.');
        }

        $host = $parts['host'];
        if (false === str_starts_with($host, '[') && true === str_contains($host, ':')) {
            $host = sprintf('[%s]', $host);
        }

        $authenticatedUrl = sprintf(
            '%s://%s:%s@%s',
            $parts['scheme'],
            rawurlencode(self::WEBHOOK_BASIC_AUTH_USER),
            rawurlencode($this->basicAuthPassword),
            $host,
        );

        if (isset($parts['port'])) {
            $authenticatedUrl .= sprintf(':%d', $parts['port']);
        }

        $authenticatedUrl .= $parts['path'] ?? '';

        if (isset($parts['query'])) {
            $authenticatedUrl .= '?'.$parts['query'];
        }

        if (isset($parts['fragment'])) {
            $authenticatedUrl .= '#'.$parts['fragment'];
        }

        return $authenticatedUrl;
    }

    private function resolveCallbackId(mixed $callbackId): int
    {
        if (true === is_int($callbackId) && $callbackId > 0) {
            return $callbackId;
        }

        if (true === is_string($callbackId) && true === ctype_digit(trim($callbackId))) {
            $resolvedCallbackId = (int) trim($callbackId);
            if ($resolvedCallbackId > 0) {
                return $resolvedCallbackId;
            }
        }

        throw new \InvalidArgumentException('A numeric callback ID is required for remove/deactivate.');
    }

    /**
     * @param array<string, mixed> $payload
     */
    private function formatPayload(array $payload): string
    {
        $encoded = json_encode($payload, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
        if (false !== $encoded) {
            return $encoded;
        }

        return var_export($payload, true);
    }
}