<?php

namespace App\InvoiceRule;

use App\InvoiceRuleInterface;

class PostReplacement implements InvoiceRuleInterface
{  
    public function getID()
    {   
        return 'post_replacement';
    }

    public function compute($criteria, &$total)
    {
        $stype = $criteria->getServiceType();

        $items = [];

        if ($stype == $this->getID())
        {
            $fee = $this->getServiceTypeFee();

            $qty = 1;
            $items[] = [
                'service_type' => $this->getID(),
                'qty' => $qty,
                'title' => $this->getServiceTitle(),
                'price' => $fee,
            ];

            $qty_price = bcmul($fee, $qty, 2);
            $total['total_price'] = bcadd($total['total_price'], $qty_price, 2);
        }

        return $items;
    }

    public function getServiceTypeFee()
    {   
        // TODO: we need to to put this somewhere like in .env
        // so that if any chanages are to be made, we just edit the file
        // instead of the code
        return 0;
    }

    public function validatePromo($criteria, $promo_id)
    {   
        return false;
    }

    public function validateInvoiceItems($criteria, $invoice_items)
    {
        return null;
    }

    protected function getServiceTitle()
    {
        $title = 'Battery replacement';

        return $title;
    }
}