<?php

declare(strict_types=1);

namespace App\Command;

use App\Entity\User;
use App\Repository\UserRepository;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\Console\Attribute\AsCommand;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Style\SymfonyStyle;

#[AsCommand(
    name: 'app:seed-user-avatars',
    description: 'Assign generated profile images to existing users.'
)]
/**
 * Seeds or refreshes user profile images using the DiceBear avatar API.
 *
 * - Skips users that already have an image unless --overwrite is provided.
 * - Builds deterministic avatar URLs based on user identity and an optional seed prefix.
 * - Does not download or cache the avatars locally; URLs are stored directly.
 */
class SeedUserAvatarsCommand extends Command
{
    public function __construct(
        private readonly UserRepository $userRepository,
        private readonly EntityManagerInterface $entityManager,
    ) {
        parent::__construct();
    }

    protected function configure(): void
    {
        $this
            ->addOption('overwrite', null, InputOption::VALUE_NONE, 'Overwrite users that already have a profile image set')
            ->addOption('style', null, InputOption::VALUE_OPTIONAL, 'DiceBear style to use for avatars', 'thumbs')
            ->addOption('seed-prefix', null, InputOption::VALUE_OPTIONAL, 'Prefix added to the avatar seed for variety', 'musicratings');
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $io = new SymfonyStyle($input, $output);
        $overwrite = (bool) $input->getOption('overwrite');
        $style = (string) $input->getOption('style');
        $seedPrefix = (string) $input->getOption('seed-prefix');

        $users = $this->userRepository->findAll();
        if ($users === []) {
            $io->warning('No users found.');
            return Command::FAILURE;
        }

        $updated = 0;
        foreach ($users as $user) {
            if (!$user instanceof User) {
                continue;
            }
            if (!$overwrite && $user->getProfileImagePath()) {
                // Respect existing uploads unless the operator explicitly allows clobbering them.
                continue;
            }
            $user->setProfileImagePath($this->buildAvatarUrl($user, $style, $seedPrefix));
            $updated++;
        }

        if ($updated === 0) {
            $io->info('No avatars needed updating.');
            return Command::SUCCESS;
        }

        $this->entityManager->flush();
        $io->success(sprintf('Assigned avatars to %d user(s).', $updated));

        return Command::SUCCESS;
    }

    private function buildAvatarUrl(User $user, string $style, string $seedPrefix): string
    {
        // Use a stable identifier (display name when present, email as fallback)
        // so the same user is always mapped to the same avatar for a given prefix.
        $identifier = trim((string) ($user->getDisplayName() ?? $user->getEmail()));
        // Combine prefix, identifier, and primary key into a deterministic hash
        // and trim it to a shorter seed value accepted by DiceBear.
        $seed = substr(hash('sha256', $seedPrefix . '|' . strtolower($identifier) . '|' . (string) $user->getId()), 0, 32);

        return sprintf('https://api.dicebear.com/7.x/%s/svg?seed=%s', rawurlencode($style), $seed);
    }
}