<?php

namespace App\InvoiceRule;

use App\InvoiceRuleInterface;

use Doctrine\ORM\EntityManagerInterface;

use App\Ramcar\ServiceType;
use App\Ramcar\TradeInType;

use App\Entity\Battery;

class BatteryReplacementWarranty implements InvoiceRuleInterface
{
    protected $em;

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

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

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

        $items = [];
        if ($stype == $this->getID())
        {
            // get the entries
            $entries = $criteria->getEntries();

            foreach($entries as $entry)
            {
                $batt = $entry['battery'];
                $qty = 1;
                $price = $this->getServiceTypeFee();     

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

                $qty_price = bcmul($price, $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)
    {
        // check service type. Only battery sales and battery warranty should have invoice items
        $stype = $criteria->getServiceType();
        if ($stype != ServiceType::BATTERY_REPLACEMENT_NEW && $stype != ServiceType::BATTERY_REPLACEMENT_WARRANTY)
            return null;

        // return error if there's a problem, false otherwise
        if (!empty($invoice_items))
        {
            // check if this is a valid battery
            foreach ($invoice_items as $item)
            {
                $battery = $this->em->getRepository(Battery::class)->find($item['battery']);

                if (empty($battery))
                {
                    $error = 'Invalid battery specified.';
                    return $error;
                }

                // quantity
                $qty = $item['quantity'];
                if ($qty < 1)
                    continue;

                // if this is a trade in, add trade in
                if (!empty($item['trade_in']) && TradeInType::validate($item['trade_in']))
                    $trade_in = $item['trade_in'];
                else
                    $trade_in = null;

                $criteria->addEntry($battery, $trade_in, $qty);
            }
        }

        return null;
    }

    protected function getTitle($battery)
    {
        $title = $battery->getModel()->getName() . ' ' . $battery->getSize()->getName() . ' - Service Unit';

        return $title;
    }
}