<?php
declare(strict_types=1);

namespace App\Media;

use PDO;

final class MediaRepository implements MediaRepositoryInterface
{
    private const SELECT = 'SELECT id, filename, url, hash, user_id, created_at FROM media';

    public function __construct(private readonly PDO $db)
    {
    }

    public function findAll(): array
    {
        $stmt = $this->db->query(self::SELECT . ' ORDER BY id DESC');
        if ($stmt === false) {
            throw new \RuntimeException('La requête SELECT sur media a échoué.');
        }

        return array_map(fn ($row) => Media::fromArray($row), $stmt->fetchAll(PDO::FETCH_ASSOC));
    }

    public function findPage(int $limit, int $offset): array
    {
        $stmt = $this->db->prepare(self::SELECT . ' ORDER BY id DESC LIMIT :limit OFFSET :offset');
        $stmt->bindValue(':limit', $limit, PDO::PARAM_INT);
        $stmt->bindValue(':offset', $offset, PDO::PARAM_INT);
        $stmt->execute();

        return array_map(fn ($row) => Media::fromArray($row), $stmt->fetchAll(PDO::FETCH_ASSOC));
    }

    public function countAll(): int
    {
        $stmt = $this->db->query('SELECT COUNT(*) FROM media');
        if ($stmt === false) {
            throw new \RuntimeException('La requête COUNT sur media a échoué.');
        }

        return (int) ($stmt->fetchColumn() ?: 0);
    }

    public function findByUserId(int $userId): array
    {
        $stmt = $this->db->prepare(self::SELECT . ' WHERE user_id = :user_id ORDER BY id DESC');
        $stmt->execute([':user_id' => $userId]);

        return array_map(fn ($row) => Media::fromArray($row), $stmt->fetchAll(PDO::FETCH_ASSOC));
    }

    public function findByUserPage(int $userId, int $limit, int $offset): array
    {
        $stmt = $this->db->prepare(self::SELECT . ' WHERE user_id = :user_id ORDER BY id DESC LIMIT :limit OFFSET :offset');
        $stmt->bindValue(':user_id', $userId, PDO::PARAM_INT);
        $stmt->bindValue(':limit', $limit, PDO::PARAM_INT);
        $stmt->bindValue(':offset', $offset, PDO::PARAM_INT);
        $stmt->execute();

        return array_map(fn ($row) => Media::fromArray($row), $stmt->fetchAll(PDO::FETCH_ASSOC));
    }

    public function countByUserId(int $userId): int
    {
        $stmt = $this->db->prepare('SELECT COUNT(*) FROM media WHERE user_id = :user_id');
        $stmt->execute([':user_id' => $userId]);

        return (int) $stmt->fetchColumn();
    }

    public function findById(int $id): ?Media
    {
        $stmt = $this->db->prepare(self::SELECT . ' WHERE id = :id');
        $stmt->execute([':id' => $id]);
        $row = $stmt->fetch(PDO::FETCH_ASSOC);

        return $row ? Media::fromArray($row) : null;
    }

    public function findByHash(string $hash): ?Media
    {
        $stmt = $this->db->prepare(self::SELECT . ' WHERE hash = :hash ORDER BY id DESC LIMIT 1');
        $stmt->execute([':hash' => $hash]);
        $row = $stmt->fetch(PDO::FETCH_ASSOC);

        return $row ? Media::fromArray($row) : null;
    }

    public function findByHashForUser(string $hash, int $userId): ?Media
    {
        $stmt = $this->db->prepare(self::SELECT . ' WHERE hash = :hash AND user_id = :user_id ORDER BY id DESC LIMIT 1');
        $stmt->execute([':hash' => $hash, ':user_id' => $userId]);
        $row = $stmt->fetch(PDO::FETCH_ASSOC);

        return $row ? Media::fromArray($row) : null;
    }

    public function create(Media $media): int
    {
        $stmt = $this->db->prepare(
            'INSERT INTO media (filename, url, hash, user_id, created_at)
             VALUES (:filename, :url, :hash, :user_id, :created_at)'
        );

        $stmt->execute([
            ':filename'   => $media->getFilename(),
            ':url'        => $media->getUrl(),
            ':hash'       => $media->getHash(),
            ':user_id'    => $media->getUserId(),
            ':created_at' => date('Y-m-d H:i:s'),
        ]);

        return (int) $this->db->lastInsertId();
    }

    public function delete(int $id): int
    {
        $stmt = $this->db->prepare('DELETE FROM media WHERE id = :id');
        $stmt->execute([':id' => $id]);

        return $stmt->rowCount();
    }
}