<?php
/**
 * The own template engine for loading caching and sending out images
 *
 * @author		Roland Haeder <webmaster@shipsimu.org>
 * @version		0.0.0
 * @copyright	Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2015 Core Developer Team
 * @license		GNU GPL 3.0 or any newer version
 * @link		http://www.shipsimu.org
 * @todo		This template engine does not make use of setTemplateType()
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */
class MailTemplateEngine extends BaseTemplateEngine implements CompileableTemplate {
	/**
	 * Main nodes in the XML tree
	 */
	private $mainNodes = array(
		'mail-data'
	);

	/**
	 * Sub nodes in the XML tree
	 */
	private $subNodes = array(
		'subject-line',
		'sender-address',
		'recipient-address',
		'message'
	);

	/**
	 * Mailer instance
	 */
	private $mailerInstance = NULL;

	/**
	 * Current main node
	 */
	private $currMainNode = '';

	/**
	 * Protected constructor
	 *
	 * @return	void
	 */
	protected function __construct () {
		// Call parent constructor
		parent::__construct(__CLASS__);
	}

	/**
	 * Creates an instance of the class TemplateEngine and prepares it for usage
	 *
	 * @return	$templateInstance		An instance of TemplateEngine
	 * @throws	BasePathIsEmptyException		If the provided $templateBasePath is empty
	 * @throws	InvalidBasePathStringException	If $templateBasePath is no string
	 * @throws	BasePathIsNoDirectoryException	If $templateBasePath is no
	 *											directory or not found
	 * @throws	BasePathReadProtectedException	If $templateBasePath is
	 *											read-protected
	 */
	public static final function createMailTemplateEngine () {
		// Get a new instance
		$templateInstance = new MailTemplateEngine();

		// Get the application instance from registry
		$applicationInstance = Registry::getRegistry()->getInstance('app');

		// Determine base path
		$templateBasePath = $templateInstance->getConfigInstance()->getConfigEntry('application_base_path') . $applicationInstance->getRequestInstance()->getRequestElement('app') . '/';

		// Is the base path valid?
		if (empty($templateBasePath)) {
			// Base path is empty
			throw new BasePathIsEmptyException($templateInstance, self::EXCEPTION_UNEXPECTED_EMPTY_STRING);
		} elseif (!is_string($templateBasePath)) {
			// Is not a string
			throw new InvalidBasePathStringException(array($templateInstance, $templateBasePath), self::EXCEPTION_INVALID_STRING);
		} elseif (!is_dir($templateBasePath)) {
			// Is not a path
			throw new BasePathIsNoDirectoryException(array($templateInstance, $templateBasePath), self::EXCEPTION_INVALID_PATH_NAME);
		} elseif (!is_readable($templateBasePath)) {
			// Is not readable
			throw new BasePathReadProtectedException(array($templateInstance, $templateBasePath), self::EXCEPTION_READ_PROTECED_PATH);
		}

		// Set the base path
		$templateInstance->setTemplateBasePath($templateBasePath);

		// Set template extensions
		$templateInstance->setRawTemplateExtension($templateInstance->getConfigInstance()->getConfigEntry('raw_template_extension'));
		$templateInstance->setCodeTemplateExtension($templateInstance->getConfigInstance()->getConfigEntry('code_template_extension'));

		// Absolute output path for compiled templates
		$templateInstance->setCompileOutputPath($templateInstance->getConfigInstance()->getConfigEntry('base_path') . $templateInstance->getConfigInstance()->getConfigEntry('compile_output_path'));

		// Return the prepared instance
		return $templateInstance;
	}

	/**
	 * Getter for current main node
	 *
	 * @return	$currMainNode	Current main node
	 */
	public final function getCurrMainNode () {
		return $this->currMainNode;
	}

	/**
	 * Getter for main node array
	 *
	 * @return	$mainNodes	Array with valid main node names
	 */
	public final function getMainNodes () {
		return $this->mainNodes;
	}

	/**
	 * Getter for sub node array
	 *
	 * @return	$subNodes	Array with valid sub node names
	 */
	public final function getSubNodes () {
		return $this->subNodes;
	}

	/**
	 * Handles the start element of an XML resource
	 *
	 * @param	$resource		XML parser resource (currently ignored)
	 * @param	$element		The element we shall handle
	 * @param	$attributes		All attributes
	 * @return	void
	 * @throws	InvalidXmlNodeException		If an unknown/invalid XML node name was found
	 */
	protected function startElement ($resource, $element, array $attributes) {
		// Initial method name which will never be called...
		$methodName = 'initEmail';

		// Make the element name lower-case
		$element = strtolower($element);

		// Is the element a main node?
		//* DEBUG: */ echo "START: &gt;".$element."&lt;<br />\n";
		if (in_array($element, $this->getMainNodes())) {
			// Okay, main node found!
			$methodName = 'setEmail' . $this->convertToClassName($element);
		} elseif (in_array($element, $this->getSubNodes())) {
			// Sub node found
			$methodName = 'setEmailProperty' . $this->convertToClassName($element);
		} elseif ($element != 'text-mail') {
			// Invalid node name found
			throw new InvalidXmlNodeException(array($this, $element, $attributes), XmlParser::EXCEPTION_XML_NODE_UNKNOWN);
		}

		// Call method
		//* DEBUG: */ echo "call: ".$methodName."<br />\n";
		call_user_func_array(array($this, $methodName), $attributes);
	}

	/**
	 * Ends the main or sub node by sending out the gathered data
	 *
	 * @param	$resource	An XML resource pointer (currently ignored)
	 * @param	$nodeName	Name of the node we want to finish
	 * @return	void
	 * @throws	XmlNodeMismatchException	If current main node mismatches the closing one
	 */
	protected function finishElement ($resource, $nodeName) {
		// Make all lower-case
		$nodeName = strtolower($nodeName);

		// Does this match with current main node?
		//* DEBUG: */ echo "END: &gt;".$nodeName."&lt;<br />\n";
		if (($nodeName != $this->getCurrMainNode()) && (in_array($nodeName, $this->getMainNodes()))) {
			// Did not match!
			throw new XmlNodeMismatchException (array($this, $nodeName, $this->getCurrMainNode()), XmlParser::EXCEPTION_XML_NODE_MISMATCH);
		} elseif (in_array($nodeName, $this->getSubNodes())) {
			// Silently ignore sub nodes
			return;
		}

		// Construct method name
		$methodName = 'finish' . $this->convertToClassName($nodeName);

		// Call the corresponding method
		call_user_func_array(array($this, $methodName), array());
	}

	/**
	 * Adds the message text to the template engine
	 *
	 * @param	$resource		XML parser resource (currently ignored)
	 * @param	$characters		Characters to handle
	 * @return	void
	 */
	protected function characterHandler ($resource, $characters) {
		// Trim all spaces away
		$characters = trim($characters);

		// Is this string empty?
		if (empty($characters)) {
			// Then skip it silently
			return;
		} // END - if

		// Add the message now
		$this->assignVariable('message', $characters);
	}

	/**
	 * Intializes the mail
	 *
	 * @return	void
	 * @todo	Add cache creation here
	 */
	private function initEmail () {
		// Unfinished work!
	}

	/**
	 * Setter for mail data node
	 *
	 * @return	void
	 * @todo	Should we call back the mailer class here?
	 */
	private function setEmailMailData () {
		// Set current main node
		$this->currMainNode = 'mail-data';
	}

	/**
	 * Setter for sender address property
	 *
	 * @param	$senderAddress	Sender address to set in email
	 * @return	void
	 */
	private function setEmailPropertySenderAddress ($senderAddress) {
		// Set the template variable
		$this->assignVariable('sender', $senderAddress);
	}

	/**
	 * Setter for recipient address property
	 *
	 * @param	$recipientAddress	Recipient address to set in email
	 * @return	void
	 */
	private function setEmailPropertyRecipientAddress ($recipientAddress) {
		// Set the template variable
		$this->assignVariable('recipient', $recipientAddress);
	}

	/**
	 * Setter for subject line property
	 *
	 * @param	$subjectLine	Subject line to set in email
	 * @return	void
	 */
	private function setEmailPropertySubjectLine ($subjectLine) {
		// Set the template variable
		$this->assignVariable('subject', $subjectLine);
	}

	/**
	 * Method stub to avoid output
	 *
	 * @return	void
	 */
	private function setEmailPropertyMessage () {
		// Empty for now
	}

	/**
	 * Gets the template variable "message", stores it back as raw template data
	 * and compiles all variables so the mail message got prepared for output
	 *
	 * @return	void
	 */
	private function finishMailData () {
		// Get the message and set it as new raw template data back
		$message = $this->readVariable('message');
		$this->setRawTemplateData($message);

		// Get some variables to compile
		//$sender = $this->compileRawCode($this->readVariable('sender'));
		//$this->assignVariable('sender', $sender);

		// Then compile all variables
		$this->compileVariables();
	}

	/**
	 * Invokes the final mail process
	 *
	 * @return	void
	 */
	private function finishTextMail () {
		$this->getMailerInstance()->invokeMailDelivery();
	}

	/**
	 * Getter for image cache file (FQFN)
	 *
	 * @return	$fqfn	Full-qualified file name of the image cache
	 * @todo	0% done
	 */
	public function getMailCacheFqfn () {
		// Initialize FQFN
		$fqfn = '';
		$this->debugBackTrace('Unfinished area!');

		// Return it
		return $fqfn;
	}

	/**
	 * Setter for mailer instance
	 *
	 * @param	$mailerInstance		A mailer instance
	 * @return	void
	 */
	public final function setMailerInstance (DeliverableMail $mailerInstance) {
		$this->mailerInstance = $mailerInstance;
	}

	/**
	 * Getter for mailer instance
	 *
	 * @return	$mailerInstance		A mailer instance
	 */
	protected final function getMailerInstance () {
		return $this->mailerInstance;
	}

	/**
	 * Outputs the mail to the world. This should only the mailer debug class do!
	 *
	 * @param	$responseInstance	An instance of a Responseable class
	 * @return	void
	 */
	public function transferToResponse (Responseable $responseInstance) {
		$responseInstance->writeToBody($this->getCompiledData());
	}
}

// [EOF]
?>