<?php

declare(strict_types=1);

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

/**
 * Precomputed recommendation list for an artwork.
 *
 * @property int         $id
 * @property int         $artwork_id
 * @property string      $rec_type       similar_hybrid|similar_visual|similar_tags|similar_behavior
 * @property array       $recs           Ordered array of artwork IDs
 * @property string      $model_version  e.g. "sim_v1"
 * @property \Carbon\Carbon $computed_at
 * @property \Carbon\Carbon $created_at
 * @property \Carbon\Carbon $updated_at
 *
 * @property-read Artwork $artwork
 */
final class RecArtworkRec extends Model
{
    protected $table = 'rec_artwork_recs';

    protected $fillable = [
        'artwork_id',
        'rec_type',
        'recs',
        'model_version',
        'computed_at',
    ];

    protected $casts = [
        'artwork_id'  => 'integer',
        'recs'        => 'array',
        'computed_at' => 'datetime',
    ];

    // ── Relations ──────────────────────────────────────────────────────────

    public function artwork(): BelongsTo
    {
        return $this->belongsTo(Artwork::class, 'artwork_id');
    }
}