<?php

namespace App\Models\Products;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
use App\Traits\ModelTrait;
use App\Traits\BelongsToTenant;

class ProductComponent extends Model
{
    use SoftDeletes, ModelTrait, BelongsToTenant;

    protected $table = 'product_components';

    protected $fillable = [
        'tenant_id',
        'parent_product_id',
        'ref_type',
        'child_product_id',
        'material_id',
        'quantity',
        'sort_order',
        'is_default',
        'created_by',
        'updated_by',
    ];

    protected $casts = [
        'quantity'   => 'decimal:4',
        'is_default' => 'boolean',
        'created_at' => 'datetime',
        'updated_at' => 'datetime',
        'deleted_at' => 'datetime',
    ];

    protected $hidden = [
        'deleted_at',
    ];


    /**
     * 상위 제품 (모델/제품)
     */
    public function parentProduct()
    {
        return $this->belongsTo(Product::class, 'parent_product_id');
    }

    /**
     * 하위 제품 (ref_type = PRODUCT일 때만 의미 있음)
     */
    public function childProduct()
    {
        return $this->belongsTo(Product::class, 'child_product_id');
    }

    /**
     * 하위 자재 (ref_type = MATERIAL일 때만 의미 있음)
     */
    public function material()
    {
        return $this->belongsTo(\App\Models\Materials\Material::class, 'material_id');
    }

    // ---------------------------------------------------
    // 🔎 Query Scopes
    // ---------------------------------------------------

    /**
     * 제품 BOM 아이템만
     */
    public function scopeProducts($query)
    {
        return $query->where('ref_type', 'PRODUCT');
    }

    /**
     * 자재 BOM 아이템만
     */
    public function scopeMaterials($query)
    {
        return $query->where('ref_type', 'MATERIAL');
    }

    /**
     * 특정 상위 제품의 BOM
     */
    public function scopeForParent($query, int $parentProductId)
    {
        return $query->where('parent_product_id', $parentProductId);
    }
}