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<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Variable\Model\Source;

use Magento\Config\Model\Config\Structure\SearchInterface;
use Magento\Variable\Model\Config\Structure\AvailableVariables;

/**
 * Store Contact Information source model.
 */
class Variables implements \Magento\Framework\Option\ArrayInterface
{
    /**
     * Variable types
     */
    const DEFAULT_VARIABLE_TYPE = "default";
    const CUSTOM_VARIABLE_TYPE = "custom";

    /**
     * Assoc array of configuration variables.
     *
     * @var array
     */
    private $configVariables = [];

    /**
     * @var AvailableVariables
     */
    private $configPaths = [];

    /**
     * @var SearchInterface
     */
    private $configStructure;

    /**
     * Constructor.
     *
     * @param SearchInterface $configStructure
     * @param array $configPaths
     */
    public function __construct(
        SearchInterface $configStructure,
        AvailableVariables $configPaths
    ) {
        $this->configStructure = $configStructure;
        $this->configPaths = $configPaths;
    }

    /**
     * Retrieve option array of store contact variables.
     *
     * @param bool $withGroup
     * @return array
     */
    public function toOptionArray($withGroup = false)
    {
        $optionArray = [];
        if ($withGroup) {
            foreach ($this->getConfigVariables() as $configVariableGroup) {
                $group = [
                    'label' => $configVariableGroup['label']
                ];
                $groupElements = [];
                foreach ($configVariableGroup['elements'] as $element) {
                    $groupElements[] = [
                        'value' => '{{config path="' . $element['value'] . '"}}',
                        'label' => $element['label'],
                    ];
                }
                $group['value'] = $groupElements;
                $optionArray[] = $group;
            }
        } else {
            foreach ($this->getConfigVariables() as $configVariableGroup) {
                foreach ($configVariableGroup['elements'] as $element) {
                    $optionArray[] = [
                        'value' => '{{config path="' . $element['value'] . '"}}',
                        'label' => $element['label'],
                    ];
                }
            }
        }
        return $optionArray;
    }

    /**
     * Return available config variables.
     *
     * @return array
     * @codeCoverageIgnore
     */
    public function getData()
    {
        return $this->getFlatConfigVars();
    }

    /**
     * Return flat list of available config variables.
     *
     * @return array
     */
    public function getAvailableVars()
    {
        return array_keys($this->configPaths->getFlatConfigPaths());
    }

    /**
     * Get flattened config variables.
     *
     * @return array
     */
    private function getFlatConfigVars()
    {
        $result = [];
        foreach ($this->getConfigVariables() as $configVariableGroup) {
            foreach ($configVariableGroup['elements'] as $element) {
                $element['group_label'] = $configVariableGroup['label'];
                $result[] = $element;
            }
        }
        return $result;
    }

    /**
     * Merge config with user defined data
     *
     * @return array
     */
    private function getConfigVariables()
    {
        if (empty($this->configVariables)) {
            foreach ($this->configPaths->getConfigPaths() as $groupPath => $groupElements) {
                $groupPathElements = explode('/', $groupPath);
                $path = [];
                $labels = [];
                foreach ($groupPathElements as $groupPathElement) {
                    $path[] = $groupPathElement;
                    $labels[] = __(
                        $this->configStructure->getElementByConfigPath(implode('/', $path))->getLabel()
                    );
                }
                $this->configVariables[$groupPath]['label'] = implode(' / ', $labels);
                foreach (array_keys($groupElements) as $elementPath) {
                    $this->configVariables[$groupPath]['elements'][] = [
                        'value' => $elementPath,
                        'label' => __($this->configStructure->getElementByConfigPath($elementPath)->getLabel()),
                    ];
                }
            }
        }

        return $this->configVariables;
    }
}