<?php

declare(strict_types=1);

namespace App\Models;

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

/**
 * Item-item co-occurrence pair for behavior-based similarity.
 *
 * @property int         $a_artwork_id
 * @property int         $b_artwork_id
 * @property float       $weight
 * @property \Carbon\Carbon $updated_at
 *
 * @property-read Artwork $artworkA
 * @property-read Artwork $artworkB
 */
final class RecItemPair extends Model
{
    protected $table = 'rec_item_pairs';

    public $incrementing = false;

    public $timestamps = false;

    protected $fillable = [
        'a_artwork_id',
        'b_artwork_id',
        'weight',
        'updated_at',
    ];

    protected $casts = [
        'a_artwork_id' => 'integer',
        'b_artwork_id' => 'integer',
        'weight'       => 'double',
        'updated_at'   => 'datetime',
    ];

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

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

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