<?php

namespace App\Models;

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

/**
 * Social edge between two characters (friend, spouse, parent-child).
 *
 * For parent_child links character_a is the child and character_b is the parent.
 */
#[Fillable(['character_a_id', 'character_b_id', 'type', 'status'])]
class Relationship extends Model
{
    public const TYPE_FRIEND = 'friend';

    public const TYPE_SPOUSE = 'spouse';

    public const TYPE_PARENT_CHILD = 'parent_child';

    public const STATUS_PENDING = 'pending';

    public const STATUS_ACCEPTED = 'accepted';

    /**
     * First character participant.
     *
     * @return BelongsTo<Character, $this>
     */
    public function characterA(): BelongsTo
    {
        return $this->belongsTo(Character::class, 'character_a_id');
    }

    /**
     * Second character participant.
     *
     * @return BelongsTo<Character, $this>
     */
    public function characterB(): BelongsTo
    {
        return $this->belongsTo(Character::class, 'character_b_id');
    }
}