<?php

namespace App\InvoiceRule;

use Doctrine\ORM\EntityManagerInterface;
use App\InvoiceRuleInterface;
use App\Ramcar\ServiceType;

class IsSubscription implements InvoiceRuleInterface
{
    protected $em;

    public function __construct(EntityManagerInterface $em)
    {
        $this->em = $em;
    }

    public function getID()
    {
        return 'discount';
    }

    public function compute($criteria, &$total)
    {
        $items = [];

        // set the discount to the total selling price
        $discount = $total['sell_price'];
        $qty = 1;
        $price = bcmul(-1, $discount, 2);

        $items[] = [
            'title' => $this->getTitle(),
            'qty' => $qty,
            'price' => $price,
        ];

        $total['discount'] = $discount;
        $total['total_price'] = bcsub($total['total_price'], $discount, 2);

        return $items;
    }

    public function validatePromo($criteria, $promo_id)
    {
        // only applies to battery sales
        if ($criteria->getServiceType() != ServiceType::BATTERY_REPLACEMENT_NEW)
            return null;

        // only applies if this is a subscription order
        if ($criteria->isSubscription() === false)
            return null;
        
        return false;
    }

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

    protected function getTitle()
    {
        $title = 'Waived for subscription';

        return $title;
    }
}