<?php
  /**
   * Copyright (c) 2013 Bart Visscher <bartv@thisnet.nl>
   * This file is licensed under the Affero General Public License version 3 or
   * later.
   * See the COPYING-README file.
   */
  
  namespace OC\Template;
  
  class Base {
  	private $template; // The template
  	private $vars; // Vars
  	private $l10n; // The l10n-Object
  	private $theme; // theme defaults

  	/**
  	 * @param string $template
  	 * @param \OC_L10N $l10n
  	 * @param \OC_Defaults $theme
  	 */

  	public function __construct( $template, $requesttoken, $l10n, $theme ) {
  		$this->vars = array();
  		$this->vars['requesttoken'] = $requesttoken;
  		$this->l10n = $l10n;
  		$this->template = $template;
  		$this->theme = $theme;
  	}

  	/**
  	 * @param string $serverroot
  	 * @param string|false $app_dir
  	 * @param string $theme
  	 * @param string $app
  	 */

  	protected function getAppTemplateDirs($theme, $app, $serverroot, $app_dir) {
  		// Check if the app is in the app folder or in the root
  		if( file_exists($app_dir.'/templates/' )) {
  			return array(
  				$serverroot.'/themes/'.$theme.'/apps/'.$app.'/templates/',
  				$app_dir.'/templates/',
  			);
  		}
  		return array(
  			$serverroot.'/themes/'.$theme.'/'.$app.'/templates/',
  			$serverroot.'/'.$app.'/templates/',
  		);
  	}

  	/**
  	 * @param string $serverroot
  	 * @param string $theme
  	 */

  	protected function getCoreTemplateDirs($theme, $serverroot) {
  		return array(
  			$serverroot.'/themes/'.$theme.'/core/templates/',
  			$serverroot.'/core/templates/',
  		);
  	}
  
  	/**

  	 * Assign variables

  	 * @param string $key key

  	 * @param array|bool|integer|string $value value

  	 * @return bool
  	 *
  	 * This function assigns a variable. It can be accessed via $_[$key] in
  	 * the template.
  	 *
  	 * If the key existed before, it will be overwritten
  	 */
  	public function assign( $key, $value) {
  		$this->vars[$key] = $value;
  		return true;
  	}
  
  	/**

  	 * Appends a variable

  	 * @param string $key key

  	 * @param mixed $value value
  	 * @return boolean|null

  	 *
  	 * This function assigns a variable in an array context. If the key already
  	 * exists, the value will be appended. It can be accessed via
  	 * $_[$key][$position] in the template.
  	 */
  	public function append( $key, $value ) {
  		if( array_key_exists( $key, $this->vars )) {
  			$this->vars[$key][] = $value;
  		}
  		else{
  			$this->vars[$key] = array( $value );
  		}
  	}
  
  	/**

  	 * Prints the proceeded template

  	 * @return bool
  	 *
  	 * This function proceeds the template and prints its output.
  	 */
  	public function printPage() {
  		$data = $this->fetchPage();
  		if( $data === false ) {
  			return false;
  		}
  		else{
  			print $data;
  			return true;
  		}
  	}
  
  	/**

  	 * Process the template
  	 * @return string

  	 *
  	 * This function processes the template.
  	 */
  	public function fetchPage() {
  		return $this->load($this->template);
  	}
  
  	/**

  	 * doing the actual work
  	 * @param string $file

  	 * @return string content
  	 *
  	 * Includes the template file, fetches its output
  	 */
  	protected function load( $file, $additionalparams = null ) {
  		// Register the variables
  		$_ = $this->vars;
  		$l = $this->l10n;
  		$theme = $this->theme;
  
  		if( !is_null($additionalparams)) {
  			$_ = array_merge( $additionalparams, $this->vars );
  		}
  
  		// Include
  		ob_start();
  		include $file;
  		$data = ob_get_contents();
  		@ob_end_clean();
  
  		// Return data
  		return $data;
  	}
  
  }