<?php
require 'autoload.php';
class Cart implements CartInterface
{
    private $Warenkorb = array();

    public function addItem($sku, $itemPrice, $quantity)
    {
        $exists = false;

        foreach($this->Warenkorb as $item){
            if($item['sku'] === $sku){
                $exists = true;
            }
        }

        if($exists){
            //Anzahl der Quanität erhöhen.
        }else{
            $newItem = array("sku" => $sku, "itemPrice" => $itemPrice, "quantity" => $quantity);
            array_push($this->Warenkorb, $newItem);
        }
    }

    public function removeItem($sku)
    {
        $exists = false;
        for($d = 0; $d < count($this->Warenkorb); $d++){
            if($this->Warenkorb[$d]['sku'] === $sku){
                unset($this->Warenkorb[$d]);
                $exists = true;
            }
        }

        if($exists === false){
            throw new Exception('Dieser Artikel ist nicht in Ihrem Warenkorb');
        }
    }

    public function getItemCount()
    {
        $total = 0;

        foreach($this->Warenkorb as $item){
            $total += $item['quantity'];
        }

        return $total;
    }

    public function getTotalPrice()
    {
        $total = 0;

        foreach($this->Warenkorb as $item){
            $total += $item['itemPrice'];
        }

        return $total;
    }

    public function getQuantity($sku)
    {
        $quantity = 0;

        $exist = false;

        foreach($this->Warenkorb as $item){
            if($item['sku'] === $sku){
                $quantity += $item['quantity'];
                $exist = true;
            }
        }

        if(!$exist){
            throw new Exception('Dieser Artikel ist nicht in Ihrem Warenkorb');
        }

        return $quantity;
    }

    public function getItems()
    {
        $items = array();

        foreach($this->Warenkorb as $item){
            $items[$item['sku']] = $item['quantity'];
        }


        return $items;
    }

    public function compareTo(CartInterface $cart)
    {
        $same = true;

        $WarenkorbB = $cart->getItems();

        $WarenkorbA = $this->getItems();

        if(count(array_diff_key($WarenkorbA, $WarenkorbB)) !== 0 OR array_diff($WarenkorbA, $WarenkorbB) !== 0){
            $same = false;
        }

        return $same;
    }
}