<?php

namespace Phem\Environment;

use Doctrine\Common\Annotations\AnnotationReader;
use Doctrine\ORM\EntityManager;
use DoctrineBoot;
use Phem\Core\Collection;
use Phem\Libraries\Forms\Annotations\Relation;
use Phem\Libraries\ResourceLoading\ResourceManager;
use Phem\Libraries\Security\Authentication\MySQLAuthenticationProvider;
use Phem\Libraries\Security\Authorization\IAuthenticationProvider;
use Phem\Libraries\Security\Authorization\IAuthorizationProvider;
use Phem\Libraries\Security\Authorization\MySQLAuthorizationProvider;
use Phem\Libraries\Security\Management\IPermissionManager;
use Phem\Libraries\Security\Management\IUserManager;
use Phem\Libraries\Security\Management\MySQLPermissionManager;
use Phem\Libraries\Security\Management\MySQLTaskManager;
use Phem\Libraries\Security\Management\MySQLUserManager;
use Phem\Libraries\Security\Management\TaskManager;
use ReflectionClass;
use Srovnavac\Models\Entities\File;
use Twig_Environment;
use Twig_Loader_Filesystem;

/**
 * This class provides basic global functions for managing sessions, http requests etc.
 * 
 * @author Jakub Petržílka <petrzilka@czweb.net>
 */
class EnvironmentManager
{

    private static $session;
    private static $entityManagers;
    private static $linkBuilder;
    private static $temporaryVariables = Array();
    private static $twig;

    /* Resources */
    private static $resourceManager;

    /* Security */
    private static $authenticationProvider;
    private static $authorizationProvider;
    private static $permissionManager;
    private static $taskManager;
    private static $userManager;

    /**
     * 
     * @return ResourceManager
     */
    static function getResourceManager()
    {
        if (self::$resourceManager == null)
        {
            self::$resourceManager = new ResourceManager();
            
        }

        return self::$resourceManager;
    }

    /**
     * 
     * @return IAuthenticationProvider
     */
    static function getAuthenticationProvider()
    {
        if (self::$authenticationProvider == null)
        {
            self::$authenticationProvider = new MySQLAuthenticationProvider();
        }

        return self::$authenticationProvider;
    }

    /**
     * 
     * @return IAuthorizationProvider
     */
    static function getAuthorizationProvider()
    {
        if (self::$authorizationProvider == null)
        {
            self::$authorizationProvider = new MySQLAuthorizationProvider();
        }

        return self::$authorizationProvider;
    }

    /**
     * 
     * @return IPermissionManager
     */
    static function getPermissionManager()
    {
        if (self::$permissionManager == null)
        {
            self::$permissionManager = new MySQLPermissionManager();
        }

        return self::$permissionManager;
    }

    /**
     * 
     * @return TaskManager
     */
    static function getTaskManager()
    {
        if (self::$taskManager == null)
        {
            self::$taskManager = new MySQLTaskManager();
        }

        return self::$taskManager;
    }

    /**
     * 
     * @return IUserManager
     */
    static function getUserManager()
    {
        if (self::$userManager == null)
        {
            self::$userManager = new MySQLUserManager();
        }

        return self::$userManager;
    }

    /**
     * @param string $key
     * @return mixed temporaryVariable
     */
    public static
            function getVariable($key)
    {
        if (array_key_exists($key, self::$temporaryVariables))
            return self::$temporaryVariables[$key];
        else
            return null;
    }

    /**
     * @param string $key
     * @param mixed $value
     * @return mixed temporaryVariable
     */
    public static function setVariable($key, $value)
    {
        if (self::$temporaryVariables == null)
            self::$temporaryVariables = Array();
        self::$temporaryVariables[$key] = $value;
    }

    /**
     * Converts matching rule to regexp
     * 
     * @param string $matchRule The input match rule
     * @return string regexp
     */
    private static function parseMatchRule($matchRule)
    {
        switch ($matchRule)
        {
            case "word":
                return "/[A-Za-z0-9_]/";
            default:
                return $matchRule;
        }
    }


    /**
     *
     * Gets the http request variable - from POST or GET method
     * (POST has higher priority if both of them are set)
     * 
     * @param string $name Name of the variable
     * @param mixed $defaultValue The default value being returned if matchRule check fails or if variable is not set
     * @param string $matchRule Matching rule can be [ "word" | regex ]
     * @return mixed The value of environment variable with given name
     */
    static function getRequestVar($name, $defaultValue = null, $matchRule = null)
    {
        $regexp = self::parseMatchRule($matchRule);

        $var = null;
        if (isset($_POST[$name]))
            $var = htmlspecialchars($_POST[$name]);
        else if (isset($_GET[$name]))
            $var = htmlspecialchars($_GET[$name]);

        if (($var != null) && ((($matchRule != null) && (preg_match($regexp, $var) > 0)) || ($matchRule == null)))
        {
            return $var;
        } else
        {
            return $defaultValue;
        }
    }

    /**
     * Factory method for accessing the Session object
     * 
     * @return Session The Session object 
     */
    static function getSession()
    {
        if (self::$session == null)
        {
            self::$session = new Session();
        }

        return self::$session;
    }

    /**
     * 
     * @return EntityManager Doctrine entity manager
     */
    static function getEntityManager($selectedDb = null)
    {
        if (self::$entityManagers == null)
        {
            self::$entityManagers = new Collection();
        }

        $dbConfig = unserialize(DB_CONFIG);

        if ($selectedDb == null)
        {
            $selectedDb = self::getSession()->getVar(ROOT_NAMESPACE . ".selectedDatabase");
        }

        if ($selectedDb == null)
        {
            $selectedDb = DB_DEFAULT_CONFIG;
        }

        if (self::$entityManagers->get($dbConfig[$selectedDb]['name']) == null)
        {

            $connection = array(
                'driver' => 'pdo_mysql',
                'host' => DB_HOST,
                'dbname' => $dbConfig[$selectedDb]['name'],
                'user' => $dbConfig[$selectedDb]['user'],
                'password' => $dbConfig[$selectedDb]['password'],
                'charset' => 'utf8',
                'driverOptions' => array(
                    1002 => 'SET NAMES utf8')
            );

            self::$entityManagers->put($dbConfig[$selectedDb]['name'], EntityManager::create($connection, DoctrineBoot::$config));
        }

        return self::$entityManagers->get($dbConfig[$selectedDb]['name']);
    }

    /**
     * 
     * @return LinkBuilder
     */
    static function getLinkBuilder()
    {
        if (self::$linkBuilder == null)
        {
            self::$linkBuilder = new LinkBuilder();
        }

        return self::$linkBuilder;
    }

    static function getTwig()
    {
        if (self::$twig == null)
        {
            $loader = new Twig_Loader_Filesystem(TEMPLATE_DIR);
            $loader->addPath(
                    FRAMEWORK_DIR . DS .
                    BUILTIN_RESOURCES_DIR . DS .
                    BUILTIN_TEMPLATES_DIR
                    , BUILTIN_TEMPLATES_NAMESPACE
            );
            $cacheAutoreload = false;
            if (defined("TWIG_DEVEL_MODE"))
                $cacheAutoreload = true;
            $twig = new Twig_Environment($loader, array(
                'cache' => TEMPLATE_CACHE_DIR,
                'auto_reload' => $cacheAutoreload,
            ));
            self::$twig = $twig;
        }

        return self::$twig;
    }

    static function getSubmittedFormData($formName)
    {
        $formData = array();
        foreach ($_POST as $key => $value)
        {
            if (strpos($key, $formName) == 0)
            {
                $formData[substr($key, strlen($formName) + 1)]
                        = $value;
            }
        }
        return $formData;
    }

    static function getSubmittedFormObject($object = null, $data = null, $prefix = "Phem_")
    {
        if ($data == null)
            $data = self::getSubmittedFormData($prefix);

        if (empty($data))
            return null;

        $className = $data['source'];
        unset($data['source']);
        if ($object == null)
        {
            $object = new $className();
        }

        /* @var $r ReflectionClass */
        $r = new ReflectionClass($className);

        foreach ($data as $property => $value)
        {
            $path = explode('_', $property);
            if (count($path) == 1)
            {
                $setMethod = "set" . ucFirst($property);
                if ($r->hasMethod($setMethod))
                {
                    $object->$setMethod($value);
                    unset($data[$property]);
                }
            }
            else
            {
                $tmp = $object;
                foreach ($path as $p)
                {
            	    $p = lcfirst($p);
		    $getMethod = "get" . ucFirst($p);
                    $setMethod = "set" . ucFirst($p);
            	    if(!method_exists($tmp, $getMethod))
            		throw new \Exception("Objekt tridy \"" . get_class($tmp) . "\" neobsahuje metodu \"" . $getMethod . "\".");
                    if (!is_object($tmp->$getMethod()))
                    {
                        $rr = new ReflectionClass(get_class($tmp));
                        $annotationReader = new AnnotationReader();
                        $annotations = $annotationReader->getPropertyAnnotations($rr->getProperty($p));
                        foreach ($annotations as $annotation)
                        {
                            if ($annotation instanceof Relation)
                            {
                                $constructor = $annotation->source;
                                $tmp->$setMethod(new $constructor());
                                $tmp = $tmp->$getMethod();
                                break;
                            }
                        }
                    }
                    else
                    {
                        $tmp = $tmp->$getMethod();
                    }
                    /* pokud je to poslední element cesty, nastav hodnotu */
                    if ($p === lcfirst(end($path)))
                    {
                        $tmp->$setMethod($value);
                    }
                }
            }
        }
        return $object;
    }
    
    static function closeDbConnection()
    {
	if (self::$entityManagers != null)
	{
            foreach (self::$entityManagers as $em)
            {
                $em->clear();
                $em->close();
                $em = null;
            }
            self::$entityManagers = null;
	}
    }

    /**
     * Check if the request is allowed AJAX request
     * 
     * @param string $sourceSiteURL the allowed site the request came from (HTTP_REFERER)
     * @return boolean
     */
    static function validAJAXRequest()
    {
        if (
        // make sure it's an AJAX request
                isset($_SERVER['HTTP_X_REQUESTED_WITH']) &&
                // make sure it has a referrer
                isset($_SERVER['HTTP_REFERER']) &&
                // make sure it comes from your website
                strpos($_SERVER['HTTP_REFERER'], "http://" . $_SERVER['HTTP_HOST']) === 0
        )
            return true;
        else
            return false;
    }

}
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