<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class SurfaceAreaConstant extends Model
{
    use HasFactory;

    protected $table = 'surface_area_constants';

    protected $fillable = [
        'standard',
        'general_name',
        'element_name_en',
        'element_name_ru',
        'product_standard',
        'dia_inch',
        'dia_mm',
        'surface_area_m2',
        // 'is_active',
    ];

    protected $casts = [
        'dia_mm' => 'decimal:2',
        'surface_area_m2' => 'decimal:6',
        // 'is_active' => 'boolean',
    ];

    /**
     * Get surface area constants by standard
     */
    public static function byStandard($standard)
    {
        return self::where('standard', $standard)
            // ->where('is_active', true)
            ->get();
    }

    /**
     * Get surface area for specific element
     */
    public static function getSurfaceArea($standard, $elementNameEn, $diaMm)
    {
        return self::where('standard', $standard)
            ->where('element_name_en', $elementNameEn)
            ->where('dia_mm', $diaMm)
            ->first();
    }

    /**
     * Get unique diameters
     */
    public static function getUniqueDiameters()
    {
        return self::select('dia_inch', 'dia_mm')
            ->distinct()
            ->orderBy('dia_mm')
            ->get();
    }

    /**
     * Get unique element types
     */
    public static function getUniqueElements($standard = null)
    {
        $query = self::select('element_name_en')
            // ->where('is_active', true)
            ->distinct();
        
        if ($standard) {
            $query->where('standard', $standard);
        }
        
        return $query->pluck('element_name_en');
    }
}