<?php

namespace App\InvoiceRule;

use Doctrine\ORM\EntityManagerInterface;

use App\InvoiceRuleInterface;

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

use App\Entity\PriceTier as PTEntity;

class PriceTier implements InvoiceRuleInterface
{
    protected $em;

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

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

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

        // get the service type
        $service_type = $criteria->getServiceType();

        // get price tier
        $pt = $em->getRepository(PTEntity::class)->find($pt_id);

        // price tier is default
        if ($pt == null)
        {
            // check if service type is battery sales
            if ($service_type == ServiceType::BATTERY_REPLACEMENT_NEW)
            {
                $items = $this->processBatteryEntries($criteria, $total);
            }
        }
        else
        {
            // get items in price tier
            $pt_items = $pt->getItemPrices();

            foreach ($pt_items as $pt_item)
            {
                // make item price hash
                $pt_prices[$pt_item->getItemID()] = $pt_item->getPrice();
            }
        }

        return $items;
    }

    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 processBatteryEntries($criteria, &$total)
    {
        $items = [];

        // get the entries
        $entries = $criteria->getEntries();
        foreach($entries as $entry)
        {
            $batt = $entry['battery'];
            $qty = $entry['qty'];
            $trade_in = null;

            if (isset($entry['trade_in']))
                $trade_in = $entry['trade_in'];

            $size = $batt->getSize();

            if ($trade_in == null)
            {
                // battery purchase
                $price = $batt->getSellingPrice();

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

                $qty_price = bcmul($price, $qty, 2);

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

        return $items;
    }

    protected function getTitle($service_type, $battery)
    {
        $title ='';

        // TODO: check for service type
        $title = $battery->getModel()->getName() . ' ' . $battery->getSize()->getName();

        return $title;
    }

}