<?php

namespace App\Models;

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

class RelatedItem extends Model
{
    protected $guarded = [];

    public function item(): MorphTo
    {
        return $this->morphTo(__FUNCTION__, 'item_type', 'item_id');
    }

    public function relatedItem(): MorphTo
    {
        return $this->morphTo(__FUNCTION__, 'related_item_type', 'related_item_id');
    }

    public function creator()
    {
        return $this->belongsTo(User::class, 'created_by');
    }

    /**
     * All edges touching a given model, either as owner or as target (symmetric view).
     */
    public static function forItem(Model $model)
    {
        return static::where(function ($query) use ($model) {
            $query->where('item_type', $model->getMorphClass())->where('item_id', $model->getKey());
        })->orWhere(function ($query) use ($model) {
            $query->where('related_item_type', $model->getMorphClass())->where('related_item_id', $model->getKey());
        });
    }

    /**
     * The model on the "other side" of this edge, relative to the given model.
     */
    public function otherItem(Model $relativeTo): ?Model
    {
        $isOwner = $this->item_type === $relativeTo->getMorphClass() && (string) $this->item_id === (string) $relativeTo->getKey();

        return $isOwner ? $this->relatedItem : $this->item;
    }
}