<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2022 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
 * Website: https://www.espocrm.com
 *
 * EspoCRM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * EspoCRM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

namespace Espo\Core\Utils\File;

use Espo\Core\{
    Utils\Util,
    Utils\File\Manager as FileManager,
    Utils\Config,
    Utils\Module,
    Utils\DataCache,
    Utils\Module\PathProvider,
};

use ReflectionClass;

class ClassMap
{
    private FileManager $fileManager;

    private Config $config;

    private Module $module;

    private DataCache $dataCache;

    private PathProvider $pathProvider;

    public function __construct(
        FileManager $fileManager,
        Config $config,
        Module $module,
        DataCache $dataCache,
        PathProvider $pathProvider
    ) {
        $this->fileManager = $fileManager;
        $this->config = $config;
        $this->module = $module;
        $this->dataCache = $dataCache;
        $this->pathProvider = $pathProvider;
    }

    /**
     * Return paths to class files.
     *
     * @param ?string[] $allowedMethods If specified, classes w/o specified method will be ignored.
     * @return array<string,class-string>
     */
    public function getData(
        string $path,
        ?string $cacheKey = null,
        ?array $allowedMethods = null,
        bool $subDirs = false
    ): array {

        $data = null;

        if (
            $cacheKey &&
            $this->dataCache->has($cacheKey) &&
            $this->config->get('useCache')
        ) {
            /** @var array<string,class-string> $data */
            $data = $this->dataCache->get($cacheKey);
        }

        if (is_array($data)) {
            return $data;
        }

        $data = $this->getClassNameHash(
            $this->pathProvider->getCore() . $path,
            $allowedMethods,
            $subDirs
        );

        foreach ($this->module->getOrderedList() as $moduleName) {
            $data = array_merge(
                $data,
                $this->getClassNameHash(
                    $this->pathProvider->getModule($moduleName) . $path,
                    $allowedMethods,
                    $subDirs
                )
            );
        }

        $data = array_merge(
            $data,
            $this->getClassNameHash(
                $this->pathProvider->getCustom() . $path,
                $allowedMethods,
                $subDirs
            )
        );

        if ($cacheKey && $this->config->get('useCache')) {
            $this->dataCache->store($cacheKey, $data);
        }

        return $data;
    }

    /**
     * @param string[]|string $dirs
     * @param ?string[] $allowedMethods
     * @return array<string,class-string>
     */
    private function getClassNameHash($dirs, ?array $allowedMethods = [], bool $subDirs = false): array
    {
        if (is_string($dirs)) {
            $dirs = (array) $dirs;
        }

        $data = [];

        foreach ($dirs as $dir) {
            if (file_exists($dir)) {
                /** @var string[] $fileList */
                $fileList = $this->fileManager->getFileList($dir, $subDirs, '\.php$', true);

                $this->fillHashFromFileList($fileList, $dir, $allowedMethods, $data);
            }
        }

        return $data;
    }

    /**
     * @param string[] $fileList
     * @param ?string[] $allowedMethods
     * @param array<string,class-string> $data
     */
    private function fillHashFromFileList(
        array $fileList,
        string $dir,
        ?array $allowedMethods,
        array &$data,
        string $category = ''
    ): void {

        foreach ($fileList as $key => $file) {
            if (is_string($key)) {
                if (is_array($file)) {
                    $this->fillHashFromFileList(
                        $file,
                        $dir . '/'. $key,
                        $allowedMethods,
                        $data,
                        $category . $key . '\\'
                    );
                }

                continue;
            }

            $filePath = Util::concatPath($dir, $file);
            $className = Util::getClassName($filePath);

            $fileName = $this->fileManager->getFileName($filePath);

            $class = new ReflectionClass($className);

            if (!$class->isInstantiable()) {
                continue;
            }

            $name = Util::normalizeScopeName(ucfirst($fileName));

            $name = $category . $name;

            if (empty($allowedMethods)) {
                $data[$name] = $className;

                continue;
            }

            foreach ($allowedMethods as $methodName) {
                if (method_exists($className, $methodName)) {
                    $data[$name] = $className;
                }
            }
        }
    }
}