<?php
/* ContentProvider.class.php - phpgitweb
 * Copyright (C) 2011-2012  Philipp Kreil (pk910)
 * 
 * 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 ContentProvider {
    private static $template_cache = array();
	private static $overall_content = array();
	
	private $template, $subtemplate;
	private $content = array();
	
    public function __construct($template, $subtemplate, $content = null) {
		$this->template = $template;
		$this->subtemplate = $subtemplate;
		
		if(is_array($content)) {
			$this->content = $content;
		}
	}
    
	public function set($name, $value) {
		$this->content[strtolower($name)] = $value;
	}
	
	public function append($name, $value) {
		if(!$value)
			return;
		if(!array_key_exists(strtolower($name), $this->content))
			$this->content[strtolower($name)] = array();
		if(!is_array($this->content[strtolower($name)]))
			$this->content[strtolower($name)] = array($this->content[strtolower($name)]);
		$this->content[strtolower($name)][] = $value;
	}
	
	public static function overall_set($name, $value) {
		self::$overall_content[strtolower($name)] = $value;
	}
	
	private function load_template($template, $subtemplate) {
		$tpl_name = 'templates/'.(GitConfig::TEMPLATE_NAME ? GitConfig::TEMPLATE_NAME : 'default').'/'.$template.'.tpl';
		if(!file_exists($tpl_name))	
			return null;
		$tpl = file($tpl_name);
		self::$template_cache[$template] = array();
		
		$cname = null;
		foreach ($tpl as $line) {
			if(preg_match('/^# \[(.*)\]/i', $line, $result)) {
				$cname = $result[1];
				self::$template_cache[$template][$cname] = '';
			} else if($cname)
				self::$template_cache[$template][$cname] .= $line;
		}
		
		return (array_key_exists($subtemplate, self::$template_cache[$template]) ? self::$template_cache[$template][$subtemplate] : null);
	}
	
	private function replace_placeholder($result) {
		$var = strtolower($result[1]);
		switch($var) {
		case "version":
			$rep = PHPGITWEB_VERSION;
			break;
		case "year":
			$rep = date("Y");
			break;
		case "rendertime":
			$rep = "%rendertime%"; //gets replaced later
			break;
		case "template_path":
			$rep = 'templates/'.(GitConfig::TEMPLATE_NAME ? GitConfig::TEMPLATE_NAME : 'default');
			break;
		default:
			if(array_key_exists($var, $this->content)) {
				$rep = $this->resolve_content($this->content[$var]);
			} else if(array_key_exists($var, self::$overall_content)) {
				$rep = $this->resolve_content(self::$overall_content[$var]);
			} else
				$rep = $var;
		}
		return $rep;
	}
	
	private function resolve_content($content) {
		$output = "";
		if(is_array($content)) {
			foreach($content as $part) {
				$output .= $this->resolve_content($part);
			}
		} elseif(is_a($content, "ContentProvider"))
			$output = $content->output();
		else
			$output = $content;
		return $output;
	}
	
	public function output() {
		$subtemplate = strtolower($this->subtemplate);
		if(array_key_exists($this->template, self::$template_cache))
			$template_html = (array_key_exists($subtemplate, self::$template_cache[$this->template]) ? self::$template_cache[$this->template][$subtemplate] : null);
		else {
			$template_html = $this->load_template($this->template, $subtemplate);
		}
		$template_html = preg_replace('/([\r\n]*)$/mD', '', $template_html);
		$template_html = preg_replace_callback('/%([^%\n]*)%/', array($this, "replace_placeholder"), $template_html);
		$template_html = preg_replace_callback('/%([^%\n]*)%/', array($this, "replace_placeholder"), $template_html);
		
		return $template_html;
	}
	
}

?>