<?php

namespace Modules\Admin\app\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use App\Traits\HasCacheModel;

class ElectricityBill extends Model
{
   use HasFactory;
   use HasCacheModel;

   public function __construct()
   {
      $this->table = 'electricity_bills';
      $this->guarded = [];
   }

   /**
    * Calculate total amount based on reading difference and unit price
    */
   public function calculateTotal(): float
   {
      $consumption = $this->current_reading - $this->previous_reading;
      return round($consumption * $this->unit_price, 2);
   }

   /**
    * Get consumption in kWh
    */
   public function getConsumption(): float
   {
      return $this->current_reading - $this->previous_reading;
   }

   /**
    * Get user who created this record
    */
   public function creator()
   {
      return $this->belongsTo(\App\Models\User::class, 'created_by');
   }

   /**
    * Get user who updated this record
    */
   public function updater()
   {
      return $this->belongsTo(\App\Models\User::class, 'updated_by');
   }
}