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<?php
/*
 * MODX Revolution
 *
 * Copyright 2006-2014 by MODX, LLC.
 * All rights reserved.
 *
 * This program 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 2 of the License, or (at your option) any later
 * version.
 *
 * This program 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
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA
 */
/**
 * @package modx
 * @subpackage transport
 */
/**
 * @package modx
 * @subpackage transport
 */
class modTransportManager {
	/**
	 * @var MODX A reference to the MODX object.
	 */
    public $modx = null;
    /**
     * @var array The configuration array for the TransportManager.
     */
    public $config = array ();
    /**
     * @var array An array of active providers.
     */
    public $providers = array ();
    /**
     * @var modWorkspace The active MODX workspace.
     */
    public $workspace = null;

    /**
     * Creates an instance of the modTransportManager class.
     *
     * @param xPDO &$modx A reference to a modX instance.
     * @return modTransportManager
     */
    function __construct(xPDO &$modx) {
        $this->modx = &$modx;
        $this->getActiveWorkspace();
        $this->modx->loadClass('transport.xPDOTransport', XPDO_CORE_PATH . 'om/', true, true);
    }

	/**
	 * Get a list of providers for the transports.
	 *
     * @access public
	 * @param boolean $refresh If true, refresh the list of providers. Defaults
	 * to false.
	 * @return array A list of providers.
	 */
    public function getProviders($refresh = false) {
        if (empty($this->providers) || $refresh) {
            $this->providers = $this->modx->getCollection('transport.modTransportProvider', array (
                'disabled' => false,
            ));
            if (!$this->providers) {
                $this->modx->log(modX::LOG_LEVEL_ERROR, "Could not find any active transport providers.");
            }
        }
        return $this->providers;
    }

	/**
	 * Get the active workspace for the MODX installation.
	 *
     * @access public
	 * @return modWorkspace
	 */
    public function getActiveWorkspace() {
        if ($this->workspace == null) {
            if (!$this->workspace = $this->modx->getObject('transport.modWorkspace', array ('active' => true))) {
                $this->modx->log(modX::LOG_LEVEL_ERROR, "Could not find an active workspace!");
            }
        }
        return $this->workspace;
    }

	/**
	 * Change the active workspace in MODX.
	 *
     * @access public
	 * @param integer $workspaceId The PK of the modWorkspace.
	 * @return modWorkspace
	 */
    public function changeActiveWorkspace($workspaceId) {
        $workspace = $this->modx->getObject('transport.modWorkspace', $workspaceId);
        if ($workspace) {
            if ($this->workspace) {
                $this->workspace->set('active', false);
                $this->workspace->save();
            }
            $workspace->set('active', true);
            $workspace->save();
            $this->workspace = $workspace;
        } else {
            $this->modx->log(modX::LOG_LEVEL_ERROR, "Could not change to workspace with id = {$workspaceId}");
        }
        return $this->workspace;
    }

	/**
	 * Scans all providers for a list of updates for all packages.
	 *
     * @access public
	 * @return array An array of updates for packages.
	 */
    public function scanForUpdates() {
        $updates = array ();
        $this->getProviders();
        foreach ($this->providers as $providerId => $provider) {
            if ($update = $provider->scanForUpdates()) {
                $updates[$providerId] = $update;
            }
        }
        return $updates;
    }

	/**
	 * Scans all providers for a list of packages.
	 *
     * @access public
	 * @return array An array of packages.
	 */
    public function scanForPackages() {
        $packages = array ();
        $this->getProviders();
        foreach ($this->providers as $providerId => $provider) {
            if ($package = $provider->scanForPackages()) {
                $packages[$providerId] = $package;
            }
        }
        return $packages;
    }
}