<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014  Yuri Kuznetsov, Taras Machyshyn, Oleksiy Avramenko
 * Website: http://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/.
 ************************************************************************/

namespace Espo\Core;

use \Espo\Core\Exceptions\Error;

use \Espo\Core\Utils\Util;

class ServiceFactory
{
    private $container;

    protected $cacheFile = 'data/cache/application/services.php';

    /**
     * @var array - path to Service files
     */
    protected $paths = array(
        'corePath' => 'application/Espo/Services',
        'modulePath' => 'application/Espo/Modules/{*}/Services',
        'customPath' => 'custom/Espo/Custom/Services',
    );

    protected $data;

    public function __construct(Container $container)
    {
        $this->container = $container;
    }

    protected function init()
    {
        $config = $this->getContainer()->get('config');

        if (file_exists($this->cacheFile) && $config->get('useCache')) {
            $this->data = $this->getFileManager()->getContents($this->cacheFile);
        } else {
            $this->data = $this->getClassNameHash($this->paths['corePath']);

            foreach ($this->getContainer()->get('metadata')->getModuleList() as $moduleName) {
                $path = str_replace('{*}', $moduleName, $this->paths['modulePath']);
                $this->data = array_merge($this->data, $this->getClassNameHash($path));
            }

            $this->data = array_merge($this->data, $this->getClassNameHash($this->paths['customPath']));

            if ($config->get('useCache')) {
                $result = $this->getFileManager()->putContentsPHP($this->cacheFile, $this->data);
                if ($result == false) {
                    throw new \Espo\Core\Exceptions\Error();
                }
            }
        }
    }

    protected function getFileManager()
    {
        return $this->container->get('fileManager');
    }

    protected function getContainer()
    {
        return $this->container;
    }

    protected function getClassName($name)
    {
        $name = Util::normilizeClassName($name);

        if (!isset($this->data)) {
            $this->init();
        }

        $name = ucfirst($name);
        if (isset($this->data[$name])) {
            return $this->data[$name];
        }

        return false;
    }

    public function checkExists($name) {
        $className = $this->getClassName($name);
        if (!empty($className)) {
            return true;
        }
    }

    public function create($name)
    {
        $className = $this->getClassName($name);
        if (empty($className)) {
            throw new Error();
        }
        return $this->createByClassName($className);
    }

    protected function createByClassName($className)
    {
        if (class_exists($className)) {
            $service = new $className();
            $dependencies = $service->getDependencyList();
            foreach ($dependencies as $name) {
                $service->inject($name, $this->container->get($name));
            }
            return $service;
        }
        throw new Error("Class '$className' does not exist");
    }

    // TODO delegate to another class
    protected function getClassNameHash($dirs)
    {
        if (is_string($dirs)) {
            $dirs = (array) $dirs;
        }

        $data = array();

        foreach ($dirs as $dir) {
            if (file_exists($dir)) {
                $fileList = $this->getFileManager()->getFileList($dir, false, '\.php$', true);
                foreach ($fileList as $file) {
                    $filePath = Util::concatPath($dir, $file);
                    $className = Util::getClassName($filePath);
                    $fileName = $this->getFileManager()->getFileName($filePath);
                    $data[$fileName] = $className;
                }
            }
        }
        return $data;
    }
}