<?php

/*
 * This file is part of SwiftMailer.
 * (c) 2004-2009 Chris Corbyn
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Changes some global preference settings in Swift Mailer.
 * @package Swift
 * @author Chris Corbyn
 */
class Swift_Preferences
{
    /** Singleton instance */
    private static $_instance = null;

    /** Constructor not to be used */
    private function __construct() { }

    /**
     * Get a new instance of Preferences.
     * @return Swift_Preferences
     */
    public static function getInstance()
    {
        if (!isset(self::$_instance)) {
            self::$_instance = new self();
        }

        return self::$_instance;
    }

    /**
     * Set the default charset used.
     * @param string
     * @return Swift_Preferences
     */
    public function setCharset($charset)
    {
        Swift_DependencyContainer::getInstance()
            ->register('properties.charset')->asValue($charset);

        return $this;
    }

    /**
     * Set the directory where temporary files can be saved.
     * @param  string            $dir
     * @return Swift_Preferences
     */
    public function setTempDir($dir)
    {
        Swift_DependencyContainer::getInstance()
            ->register('tempdir')->asValue($dir);

        return $this;
    }

    /**
     * Set the type of cache to use (i.e. "disk" or "array").
     * @param  string            $type
     * @return Swift_Preferences
     */
    public function setCacheType($type)
    {
        Swift_DependencyContainer::getInstance()
            ->register('cache')->asAliasOf(sprintf('cache.%s', $type));

        return $this;
    }

    /**
     * Add the
     * @param  boolean           $dotEscape
     * @return Swift_Preferences
     */
    public function setQPDotEscape($dotEscape)
    {
        $dotEscape=!empty($dotEscape);
        Swift_DependencyContainer::getInstance()
            -> register('mime.qpcontentencoder')
            -> asNewInstanceOf('Swift_Mime_ContentEncoder_QpContentEncoder')
            -> withDependencies(array('mime.charstream', 'mime.bytecanonicalizer'))
            -> addConstructorValue($dotEscape);

        return $this;
    }
}