<?php

namespace App\InvoiceRule;

use Doctrine\ORM\EntityManagerInterface;

use App\InvoiceRuleInterface;

use App\Ramcar\ServiceType;

use App\Entity\ServiceOffering;
use App\Entity\CustomerVehicle;
use App\Entity\ItemType;

use App\Service\PriceTierManager;

class Overheat implements InvoiceRuleInterface
{
    protected $em;
    protected $pt_manager;

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

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

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

        $items = [];

        if ($stype == $this->getID())
        {
            $cv = $criteria->getCustomerVehicle();

            // check if price tier has item price
            $pt_price = $this->getPriceTierItemPrice($pt_id, $cv);

            if ($pt_price == null)
                $price = $this->getServiceTypeFee($cv);
            else

                $price = $pt_price;

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

            $qty_fee = bcmul($qty, $price, 2);
            $total_price = $qty_fee;

            if ($has_coolant)
            {
                $coolant_fee = $this->getCoolantFee();
                $items[] = [
                    'service_type' => $this->getID(),
                    'qty' => $qty,
                    'title' => $this->getServiceCoolantTitle(),
                    'price' => $coolant_fee,
                ];

                $qty_price = bcmul($coolant_fee, $qty, 2);
                $total_price = bcadd($total_price, $qty_price, 2);
            }

            $total['total_price'] = bcadd($total['total_price'], $total_price, 2);
        }

        return $items;
    }

    public function getServiceTypeFee(CustomerVehicle $cv)
    {
        $code = 'overheat_fee';

        // check if customer vehicle has a motolite battery
        // if yes, set the code to the motolite user service fee
        if ($cv->hasMotoliteBattery())
            $code = 'motolite_user_service_fee';

        // find the service fee for overheat using the code
        // if we can't find the fee, return 0
        $fee = $this->em->getRepository(ServiceOffering::class)->findOneBy(['code' => $code]);

        if ($fee == null)
            return 0;

        return $fee->getFee();
    }

    public function getCoolantFee()
    {
        $code = 'coolant_fee';

        // find the service fee using the code
        // if we can't find the fee, return 0
        $fee = $this->em->getRepository(ServiceOffering::class)->findOneBy($code);

        if ($fee == null)
            return 0;
            
        return $fee->getFee();
    }

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

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

    protected function getPriceTierItemPrice($pt_id, CustomerVehicle $cv)
    {
        // price_tier is default
        if ($pt_id == 0)
            return null;

        // find the item type for service offering
        $item_type = $this->em->getRepository(ItemType::class)->findOneBy(['code' => 'service_offering']);
        if ($item_type == null)
            return null;

        // find the service offering
        $code = 'overheat_fee';

        // check if customer vehicle has a motolite battery
        // if yes, set the code to the motolite user service fee
        if ($cv->hasMotoliteBattery())
            $code = 'motolite_user_service_fee';

        $service = $this->em->getRepository(ServiceOffering::class)->findOneBy(['code' => $code]);

        // check if service is null. If null, return null
        if ($service == null)
            return null;

        $item_type_id = $item_type->getID();
        $item_id = $service->getID();

        $price = $this->pt_manager->getItemPrice($pt_id, $item_type_id, $item_id);

        return $price;
    }

    protected function getServiceTitle()
    {
        $title = 'Service - ' . ServiceType::getName(ServiceType::OVERHEAT_ASSISTANCE);

        return $title;
    }

    protected function getServiceCoolantTitle()
    {
        $title = '4L Coolant';

        return $title;
    }
}