<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

namespace Magento\TestFramework\Utility;

use Magento\Framework\App\Utility\Files;

/**
 * A helper to gather various changed files
 * if INCREMENTAL_BUILD env variable is set by CI build infrastructure, only files changed in the
 * branch are gathered, otherwise all files
 */
class ChangedFiles
{
    /**
     * File path with changed files content.
     */
    const CHANGED_FILES_CONTENT_FILE = '/dev/tests/static/testsuite/Magento/Test/_files/changed_%s_files_content.json';

    /**
     * Returns array of PHP-files, that use or declare Magento application classes and Magento libs
     *
     * @param string $changedFilesList
     * @param int $fileTypes
     * @return array
     */
    public static function getPhpFiles($changedFilesList, $fileTypes = 0)
    {
        $fileUtilities = Files::init();
        if (isset($_ENV['INCREMENTAL_BUILD'])) {
            $phpFiles = [];
            foreach (glob($changedFilesList, GLOB_NOSORT) as $listFile) {
                $phpFiles = array_merge($phpFiles, file($listFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES));
            }
            array_walk(
                $phpFiles,
                function (&$file) {
                    $file = BP . '/' . $file;
                }
            );
            if (!empty($phpFiles)) {
                $phpFiles = Files::composeDataSets($phpFiles);
                $phpFiles = array_intersect_key($phpFiles, $fileUtilities->getPhpFiles($fileTypes));
            }
        } else {
            $phpFiles = $fileUtilities->getPhpFiles($fileTypes);
        }

        return $phpFiles;
    }

    /**
     * Get changed content.
     *
     * @param string $fileName
     * @return string
     */
    public static function getChangedContent($fileName)
    {
        $data = [];
        $extension = self::getFileExtension($fileName);
        $fileName = ltrim(str_replace(BP, '', $fileName), DIRECTORY_SEPARATOR);
        $changedFilesContentFile = BP . sprintf(self::CHANGED_FILES_CONTENT_FILE, $extension);
        if (file_exists($changedFilesContentFile)) {
            $changedContent = file_get_contents($changedFilesContentFile);
            $data = json_decode($changedContent, true);
        }

        return isset($data[$fileName]) ? $data[$fileName] : '';
    }

    /**
     * Get file extension.
     *
     * @param string $fileName
     * @return string
     */
    public static function getFileExtension($fileName)
    {
        $fileInfo = pathinfo($fileName);
        return isset($fileInfo['extension']) ? $fileInfo['extension'] : 'unknown';
    }
}