<?php

/**
 * @package Presentation
 */
class Template {
	var $vars; /// Holds all the template variables
	var $path; /// Path to the templates
	var $templates; /// alamtempleidid
	var $filename;
	var $glues;
	var $parent;
	
	/**
	* template, millega võidakse asendada käesolev template.
	* 'alam'-template, mis katab täielikult antud templeidi, nii et
	* antud templeidi asemel renderdatakse alamtempleit.
	*/
	var $over_template;

	/**
	 * Constructor
	 *
	 * @param string $path the path to the templates
	 *
	 * @return void
	 */
	function Template($filename = null, $path = null){//, $parent = null) {
	    global $tpl_path;
		$this->path = ($path ? $path : $tpl_path);
		$this->filename = $filename;
		//$this->set_parent($parent);
		$this->init();
	}

	function init() {
		$this->vars = array();
		$this->templates = array();
	}

	/**
	 * Set the path to the template files.
	 *
	 * @param string $path path to template files
	 *
	 * @return void
	 */
	function set_path($path) {
		$this->path = $path;
	}

	/**
	 * Set a template variable.
	 *
	 * @param string $name name of the variable to set
	 * @param mixed $value the value of the variable
	 *
	 * @return void
	 */
	function set($name, $value) {
		$this->vars[$name] = $value;
	}

	function set_glue($name, $value) {
		$this->glues[$name] = $value;
	}

	/**
	 * Set a bunch of variables at once using an associative array.
	 *
	 * @param array $vars array of vars to set
	 * @param bool $clear whether to completely overwrite the existing vars
	 *
	 * @return void
	 */
	function set_vars($vars, $clear = false) {
		if($clear) {
			$this->vars = $vars;
		}
		else {
			if(is_array($vars)) $this->vars = array_merge($this->vars, $vars);
		}
	}

	/**
	 * Open, parse, and return the template file.
	 *
	 * @param string string the template file name
	 *
	 * @return string
	 */
	function fetch($file_name) {
		if (isset($this->over_template)) {
			return $this->over_template->render();
		}
			
		if (!isset($file_name))
			return '';
		
	    foreach ($this->templates as $name => $tpl) {
			if (is_array($tpl)) {
				$glue = (isset($this->glues[$name]) ? $this->glues[$name] : "");
				foreach ($tpl as $subtpl) {
					$rendered[] = $subtpl->render();
					$this->vars[$name] = implode($glue, $rendered);
				}
			}
			else {
	        	$this->vars[$name] = $tpl->render();
			}
	    }
		extract($this->vars);          // Extract the vars to local namespace
		ob_start();                    // Start output buffering
		include($this->path . $file_name);  // Include the file
		$contents = ob_get_contents(); // Get the contents of the buffer
		ob_end_clean();                // End buffering and discard
		
		//kui templeidis leidusid muutujad, mida pole defineeritud,
		//tuleks neile anda vaikimisi tühjad väärtused.
		//if()
		//kuidas saaks kontrollida, kas oli mingi warning väärtustamata muutuja kohta?
		//tegelt ei tee praegu, kirjutan tingimused templat'i
		
		return $contents;              // Return the contents
	}

	function render() {
		return $this->fetch($this->filename);
	}

	/**
	 */
	function set_tplfile($filename) {
		$this->filename = $filename;
	}

	/**
	* Vaikimisi template fail - juhul kui pole juba väärtustatud
	* 
	 */
	function def_tplfile($filename) {
		if (!isset($this->filename))
			$this->filename = $filename;
	}

	/**
	 * Template :: set_parent()
	 * 
	 * Vajadusel võivad järglased siin teostada mingeid tegevusi, 
	 * kui on näiteks mingi inf vaja parentile edasi anda, 
	 * või ennast kohandada kuidagi parentiga.
	 */
	function set_parent(&$parent) {
		$this->parent =& $parent;
	}

	function set_template($name, &$template) {
		$this->templates[$name] =& $template;
		$template->set_parent($this);
	}

	function add_template($name, &$template) {
		if (isset($this->templates[$name])) {
			if (is_array($this->templates[$name])) {
				//$this->templates[$name][] = $template;
				$this->templates[$name][] =& $template;
				//$template->set_parent($this);//miks see siin on???
			} else {
				
				$newarr = array();
				$newarr[] =& $this->templates[$name];
				$newarr[] =& $template;
				$this->templates[$name] =& $newarr;
				
				//$this->templates[$name] = array(&$this->templates[$name], &$template);
			}
			$template->set_parent($this);
		}
		else
			$this->set_template($name, $template);
			
	}

	function set_over_template(&$template) {
		$this->over_template =& $template;
	}

}

?>