<?php

declare(strict_types=1);

namespace App\Command;

use App\Entity\Album;
use App\Entity\User;
use App\Repository\AlbumRepository;
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-demo-albums',
    description: 'Create demo albums with randomized metadata for local development.'
)]
/**
 * Seeds the database with synthetic user-sourced albums.
 *
 * - Always marked as "user" source with a unique localId.
 * - Include randomized names, artists, genres, release dates, and cover URLs.
 * - Optionally link to existing users as creators when --attach-users is set.
 */
class SeedDemoAlbumsCommand extends Command
{
    private const GENRES = [
        'Dreamwave', 'Synth Pop', 'Lo-Fi', 'Indie Rock', 'Chillhop', 'Neo Jazz',
        'Electro Funk', 'Ambient', 'Future Soul', 'Post Folk', 'Shoegaze', 'Hyperpop',
    ];

    private const ADJECTIVES = [
        'Electric', 'Velvet', 'Crimson', 'Solar', 'Golden', 'Neon', 'Silent', 'Liquid', 'Violet', 'Paper',
    ];

    private const NOUNS = [
        'Echoes', 'Horizons', 'Magnets', 'Parades', 'Cities', 'Signals', 'Fragments', 'Constellations',
        'Gardens', 'Drifters', 'Reflections', 'Blueprints',
    ];

    public function __construct(
        private readonly EntityManagerInterface $entityManager,
        private readonly AlbumRepository $albumRepository,
        private readonly UserRepository $userRepository,
    ) {
        parent::__construct();
    }

    protected function configure(): void
    {
        $this
            ->addOption('count', null, InputOption::VALUE_OPTIONAL, 'Number of demo albums to create', 40)
            ->addOption('attach-users', null, InputOption::VALUE_NONE, 'If set, randomly assigns existing users as creators');
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $io = new SymfonyStyle($input, $output);
        $count = max(1, (int) $input->getOption('count'));
        $attachUsers = (bool) $input->getOption('attach-users');
        $users = $attachUsers ? $this->userRepository->findAll() : [];

        $created = 0;
        // Track generated localIds so we never attempt to persist obvious duplicates.
        $seenLocalIds = [];

        while ($created < $count) {
            // Generate a localId that is unique in-memory and in the database to avoid constraint violations.
            $localId = $this->generateLocalId();
            if (isset($seenLocalIds[$localId]) || $this->albumRepository->findOneBy(['localId' => $localId]) !== null) {
                // Only accept IDs that are unique both in-memory and in the DB to avoid constraint errors.
                continue;
            }

            $album = new Album();
            $album->setSource('user');
            $album->setLocalId($localId);
            $album->setName($this->generateAlbumName());
            $album->setArtists($this->generateArtists());
            $album->setGenres($this->generateGenres());
            $album->setReleaseDate($this->generateReleaseDate());
            $album->setTotalTracks(random_int(6, 16));
            $album->setCoverUrl($this->generateCoverUrl($localId));
            $album->setExternalUrl(sprintf('https://example.com/demo-albums/%s', $localId));

            if ($attachUsers && $users !== []) {
                /** @var User $user */
                $user = $users[array_rand($users)];
                $album->setCreatedBy($user);
            }

            $this->entityManager->persist($album);
            $seenLocalIds[$localId] = true;
            $created++;
        }

        $this->entityManager->flush();

        $io->success(sprintf('Created %d demo albums%s.', $created, $attachUsers ? ' with random owners' : ''));

        return Command::SUCCESS;
    }

    private function generateLocalId(): string
    {
        return 'demo_' . bin2hex(random_bytes(4));
    }

    private function generateAlbumName(): string
    {
        $adj = self::ADJECTIVES[random_int(0, count(self::ADJECTIVES) - 1)];
        $noun = self::NOUNS[random_int(0, count(self::NOUNS) - 1)];
        $genre = self::GENRES[random_int(0, count(self::GENRES) - 1)];

        return sprintf('%s %s of %s', $adj, $noun, $genre);
    }

    /**
     * @return list<string>
     */
    private function generateArtists(): array
    {
        $artists = [];
        $artistCount = random_int(1, 3);
        for ($i = 0; $i < $artistCount; $i++) {
            $artists[] = sprintf(
                '%s %s',
                self::ADJECTIVES[random_int(0, count(self::ADJECTIVES) - 1)],
                self::NOUNS[random_int(0, count(self::NOUNS) - 1)]
            );
        }

        return array_values(array_unique($artists));
    }

    private function generateReleaseDate(): string
    {
        $year = random_int(1990, (int) date('Y'));
        $month = random_int(1, 12);
        $day = random_int(1, 28);

        return sprintf('%04d-%02d-%02d', $year, $month, $day);
    }

    /**
     * @return list<string>
     */
    private function generateGenres(): array
    {
        $count = random_int(1, 3);
        $genres = [];
        for ($i = 0; $i < $count; $i++) {
            $genres[] = self::GENRES[random_int(0, count(self::GENRES) - 1)];
        }
        return array_values(array_unique($genres));
    }

    private function generateCoverUrl(string $seed): string
    {
        return sprintf('https://picsum.photos/seed/%s/640/640', $seed);
    }
}