<?php

/*
 * Title: Template Class
 * Purpose:
 *  	The Template class contains all functions relating to Ditto's
 *  	handling of templates and any supporting functions they need
*/

class template{
	var $language,$fields,$current;

	// ---------------------------------------------------
	// Function: template
	// Set the class language and fields variables
	// ---------------------------------------------------
	function template() {
		$this->language = $GLOBALS["ditto_lang"];
		$this->fields = array (
			"db" => array (),
			"tv" => array (),
			"custom" => array (),
			"item" => array (),
			"qe" => array (),
			"phx" => array (),
			"rss" => array (),
			"json" => array (),
			"xml" => array (),
			"unknown" => array()
		);
	}

	// ---------------------------------------------------
	// Function: process
	// Take the templates and parse them for tempalte variables,
	// Check to make sure they have fields, and sort the fields
	// ---------------------------------------------------
	function process($template) {
		if (!isset($template["base"])) {
			$template["base"] = $template["default"];
		} else {
			unset($template["default"]);
		}
		foreach ($template as $name=>$tpl) {
			if(!empty($tpl) && $tpl != "") {
				$templates[$name] = $this->fetch($tpl);
			}
		}
		$fieldList = array();
		foreach ($templates as $tplName=>$tpl) {
			$check = $this->findTemplateVars($tpl);
			if (is_array($check)) {
				$fieldList = array_merge($check, $fieldList);
			} else {
				switch ($tplName) {
					case "base":
						$displayName = "tpl";
					break;
					
					case "default":
						$displayName = "tpl";
					break;
					
					default:
						$displayName = "tpl".$tplName;
					break;
				}
				$templates[$tplName] = str_replace("[+tpl+]",$displayName,$this->language["bad_tpl"]);
			}
		}

		$fieldList = array_unique($fieldList);
		$fields = $this->sortFields($fieldList);
		$checkAgain = array ("qe", "json", "xml");
		foreach ($checkAgain as $type) {
			$fields = array_merge_recursive($fields, $this->sortFields($fields[$type]));
		}
		$this->fields = $fields;
		return $templates;
	}

	// ---------------------------------------------------
	// Function: findTemplateVars
	// Find al the template variables in the template
	// ---------------------------------------------------
	function findTemplateVars($tpl) {
		preg_match_all('~\[\+(.*?)\+\]~', $tpl, $matches);
		$TVs = array();
		foreach($matches[1] as $tv) {
			$match = explode(":", $tv);
			$TVs[strtolower($match[0])] = $match[0];
		}
		if (count($TVs) >= 1) {
			return array_values($TVs);
		} else {
			return false;
		}
	}

	// ---------------------------------------------------
	// Function: sortFields
	// Sort the array of fields provided by type
	// ---------------------------------------------------
	function sortFields ($fieldList) {
		global $ditto_constantFields;
		$dbFields = $ditto_constantFields["db"];
		$tvFields = $ditto_constantFields["tv"];
		$fields = array (
			"db" => array (),
			"tv" => array (),
			"custom" => array (),
			"item" => array (),
			"qe" => array (),
			"phx" => array (),
			"rss" => array (),
			"json" => array (),
			"xml" => array (),
			"unknown" => array()
		);
		
		$custom = array("author","date","url","title","ditto_iteration");

		foreach ($fieldList as $field) {
			if (substr($field, 0, 4) == "rss_") {
				$fields['rss'][] = substr($field,4);
			}else if (substr($field, 0, 4) == "xml_") {
				$fields['xml'][] = substr($field,4);
			}else if (substr($field, 0, 5) == "json_") {
				$fields['json'][] = substr($field,5);
			}else if (substr($field, 0, 4) == "item") {
				$fields['item'][] = substr($field, 4);
			}else if (substr($field, 0, 1) == "#") {
				$fields['qe'][] = substr($field,1);
			}else if (substr($field, 0, 3) == "phx") {
				$fields['phx'][] = $field;
			}else if (in_array($field, $dbFields)) {
				$fields['db'][] = $field;
			}else if(in_array($field, $tvFields)){
				$fields['tv'][] = $field;
			}else if(substr($field, 0, 2) == "tv" && in_array(substr($field,2), $tvFields)) {
				$fields['tv'][] = substr($field,2);
					// TODO: Remove TV Prefix support in Ditto
			}else if (in_array($field, $custom)) {
				$fields['custom'][] = $field;
			}else {
				$fields['unknown'][] = $field; 
			}
		}
		return $fields;
	}

	// ---------------------------------------------------
	// Function: replace
	// Replcae placeholders with their values
	// ---------------------------------------------------
    public static function replace( $placeholders, $tpl ) {
		$keys = array();
		$values = array();
		foreach ($placeholders as $key=>$value) {
			$keys[] = '[+'.$key.'+]';
			$values[] = $value;
		}
		return str_replace($keys,$values,$tpl);
	}

	// ---------------------------------------------------
	// Function: determine
	// Determine the correct template to apply
	// ---------------------------------------------------		
	function determine($templates,$x,$start,$stop,$id) {
		global $modx;

		// determine current template
		$currentTPL = "base";
		if ($x % 2 && !empty($templates["alt"])) {
			$currentTPL = "alt";
		}
		if ($id == $modx->documentObject['id'] && !empty($templates["current"])){
			$currentTPL = "current";
		}
		if ($x == 0 && !empty($templates["first"])) {
			$currentTPL = "first";
		}
		if ($x == ($stop -1) && !empty($templates["last"])) {
			$currentTPL = "last";
		} 
		$this->current = $currentTPL;
		return $templates[$currentTPL];
	}

	// ---------------------------------------------------
	// Function: fetch
	// Get a template, based on version by Doze
	// 
	// http://modxcms.com/forums/index.php/topic,5344.msg41096.html#msg41096
	// ---------------------------------------------------
	function fetch($tpl){
		global $modx;
		$template = "";
		if ($modx->getChunk($tpl) != "") {
			$template = $modx->getChunk($tpl);
		} else if(substr($tpl, 0, 6) == "@FILE:") {
			$template = $this->get_file_contents(substr($tpl, 6));
		} else if(substr($tpl, 0, 6) == "@CODE:") {
			$template = substr($tpl, 6);
		} else if(substr($tpl, 0, 5) == "@FILE") {
			$template = $this->get_file_contents(trim(substr($tpl, 5)));
		} else if(substr($tpl, 0, 5) == "@CODE") {
			$template = trim(substr($tpl, 5));
		} else {
			$template = $this->language['missing_placeholders_tpl'];
		}
			return $template;
	}

	// ---------------------------------------------------
	// Function: get_file_contents
	// Returns the contents of file name passed
	// 
	// From http://www.nutt.net/2006/07/08/file_get_contents-function-for-php-4/#more-210
	// ---------------------------------------------------
	function get_file_contents($filename) {
		if (!function_exists('file_get_contents')) {
			$fhandle = fopen($filename, "r");
			$fcontents = fread($fhandle, filesize($filename));
			fclose($fhandle);
		} else	{
			$fcontents = file_get_contents($filename);
		}
		return $fcontents;
	}
}

?>