<?php

namespace Empik\Marketplace\Utils;

use Configuration;
use Empik\Marketplace\Adapter\ConfigurationAdapter;
use Empik\Marketplace\Exception\LogicException;

class IdentifierExtractor
{
    const IDENTIFIER_EAN = 'EAN';
    const IDENTIFIER_SKU = 'SHOP_SKU';

    /** @var string */
    protected $identifierType;

    public function __construct()
    {
        $this->identifierType = Configuration::get(ConfigurationAdapter::CONF_OFFER_IDENTIFIER);
    }

    /**
     * @return bool|false|string
     */
    public function getIdentifierType()
    {
        return $this->identifierType;
    }

    /**
     * @return string
     * @throws LogicException
     */
    public function getFilterKey()
    {
        switch ($this->identifierType) {
            case self::IDENTIFIER_EAN:
                $key = 'p.ean13';
                break;
            case self::IDENTIFIER_SKU:
                $key = 'p.reference';
                break;
            default:
                throw new LogicException(sprintf('Unknown identifier type: "%s"', $this->identifierType));
        }

        return $key;
    }

    /**
     * @param array $product
     * @return mixed|string
     * @throws LogicException
     */
    public function extract(array $product)
    {
        switch ($this->identifierType) {
            case self::IDENTIFIER_EAN:
                $identifier = isset($product['ean13']) ? $product['ean13'] : '';
                break;
            case self::IDENTIFIER_SKU:
                $identifier = isset($product['reference']) ? $product['reference'] : '';
                break;
            default:
                throw new LogicException(sprintf('Unknown identifier type: "%s"', $this->identifierType));
        }

        return $identifier;
    }
}