<?php

namespace App\Models;

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

class ShipmentPackage extends Model
{
    protected $fillable = [
        'shipment_id',
        'package_no',
        'weight',
        'volumetric_weight',
        'chargeable_weight',
        'dimensions',
        'content_description',
    ];

    protected $casts = [
        'weight' => 'decimal:3',
        'volumetric_weight' => 'decimal:3',
        'chargeable_weight' => 'decimal:3',
    ];

    /**
     * رابطه با Shipment
     */
    public function shipment(): BelongsTo
    {
        return $this->belongsTo(Shipment::class);
    }

    /**
     * محاسبه وزن قابل محاسبه (ماکزیمم وزن واقعی و حجمی)
     */
    public function calculateChargeableWeight(): float
    {
        return max((float) $this->weight, (float) $this->volumetric_weight);
    }

    /**
     * محاسبه وزن حجمی از ابعاد
     * فرمول: (طول × عرض × ارتفاع) / 5000
     */
    public static function calculateVolumetricWeight(?string $dimensions): float
    {
        if (!$dimensions) return 0;

        // پارس کردن ابعاد - فرمت‌های ممکن: "25*15*3" یا "25x15x3" یا "25,15,3"
        $parts = preg_split('/[\*xX,]/', trim($dimensions));
        if (count($parts) !== 3) return 0;

        $length = (float) trim($parts[0]);
        $width = (float) trim($parts[1]);
        $height = (float) trim($parts[2]);

        if ($length <= 0 || $width <= 0 || $height <= 0) return 0;

        // فرمول استاندارد IATA: (L × W × H) / 5000
        return round(($length * $width * $height) / 5000, 3);
    }
}