<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Payment\Gateway\Config;

use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Payment\Gateway\ConfigInterface;
use Magento\Store\Model\ScopeInterface;

/**
 * Default implementation of Payment Gateway Config.
 *
 * To process value retrieved from config implementation of \Magento\Payment\Gateway\Config\ValueHandlerInterface
 * should be used (inheritance and overriding of getValue method or introduction of new public methods
 * is not recommended).
 */
class Config implements ConfigInterface
{
    const DEFAULT_PATH_PATTERN = 'payment/%s/%s';

    /**
     * @var ScopeConfigInterface
     */
    private $scopeConfig;

    /**
     * @var string|null
     */
    private $methodCode;

    /**
     * @var string|null
     */
    private $pathPattern;

    /**
     * @param ScopeConfigInterface $scopeConfig
     * @param string|null $methodCode
     * @param string $pathPattern
     */
    public function __construct(
        ScopeConfigInterface $scopeConfig,
        $methodCode = null,
        $pathPattern = self::DEFAULT_PATH_PATTERN
    ) {
        $this->scopeConfig = $scopeConfig;
        $this->methodCode = $methodCode;
        $this->pathPattern = $pathPattern;
    }

    /**
     * Sets method code
     *
     * @param string $methodCode
     * @return void
     */
    public function setMethodCode($methodCode)
    {
        $this->methodCode = $methodCode;
    }

    /**
     * Sets path pattern
     *
     * @param string $pathPattern
     * @return void
     */
    public function setPathPattern($pathPattern)
    {
        $this->pathPattern = $pathPattern;
    }

    /**
     * Retrieve information from payment configuration
     *
     * @param string $field
     * @param int|null $storeId
     *
     * @return mixed
     */
    public function getValue($field, $storeId = null)
    {
        if ($this->methodCode === null || $this->pathPattern === null) {
            return null;
        }

        return $this->scopeConfig->getValue(
            sprintf($this->pathPattern, $this->methodCode, $field),
            ScopeInterface::SCOPE_STORE,
            $storeId
        );
    }
}