<?php
/**
 *  
 * @author  Benjamin Gillissen <hide@address.com>
 * 
 *	**************************************************************

	Copyright (C) 2009  Benjamin Gillissen
	
	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 2
	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 at:
	http://www.gnu.org/copyleft/gpl.html

 *	**************************************************************
 */
class themes {

	private static $active;			//Active theme reference
	private static $THM;			//Active theme object
	private static $CC;				//client configs object
	
	/*public static function isloaded(){ return isset(self::$THM); }*/
	
	public static function load(){
		if ( isset(self::$THM) ){ return TRUE; }
		if ( ! isset(self::$CC) ){ 
			$run 		= Array(client_configs::SESSION=>'profile');
			$store		= Array(client_configs::PROFILE=>'site_profile');
			$run_update  = Array(client_configs::GET=>'', client_configs::POST=>'');
			$store_update= Array(client_configs::POST=>'');
			self::$CC = new client_configs($run, $store, $run_update, $store_update);
			unset($run, $store, $run_update, $store_update);
		}
		self::get_active();
		errors::raise('Themes is using theme : '.self::$active.', '.self::getname(), CORE_LOG_NOTICE, 'THEME');
		$class = configs::get('themes', 'themes', Array(self::$active, 'class'));
		if ( FALSE === $class ){
			errors::raise("Missing class setting for Theme self::$active, plz check your theme config, trying failsave", CORE_LOG_WARNING, 'THEME');
			$class = 'thm_failsave';
		} elseif ( FALSE === CORE::getdeps(PATH_LIBS, $class, 'thm_', 'class', 'php') ){
			errors::raise("Theme object '".$class."' was not found in ".PATH_LIBS.", trying failsave", CORE_LOG_WARNING, 'THEME');
			$class = 'thm_failsave';
		} else {
			$class = 'thm_'.$class;
		}
		self::$THM = new $class();
		return TRUE;
	}
	
	public static function get_active(){
		if ( isset(self::$active) ){ return self::$active; }
		if ( self::$CC->is_updated('theme') ){
			$new = self::$CC->get_updated('theme');
			if ( FALSE === self::istheme($new) ){ 
				unset($new);self::$CC->del_updated('theme'); 
			} else { 
				//store to sess, only profile page update profile eh
				self::$CC->store_updated('theme');
			}
		} elseif ( self::$CC->is_stored('theme') ){
			$new = self::$CC->get_stored('theme');
			if ( FALSE === self::istheme($new) ){ unset($new);self::$CC->del_stored('theme'); }
		} else {
			$new = self::negotiateTheme();
		}
		if ( ! isset($new) ){ $new = configs::get('themes', 'default');	}
		if ( FALSE === $new ){ 
			errors::raise('Active theme could be determined !, plz check your themes.opt.php file', CORE_LOG_ERROR, 'THEME');
		}
		self::$active = $new;
		return self::$active;	
	}
	
	public static function getname($ref=NULL){
		if ( $ref === NULL ){ $ref = self::$active; } 
		return configs::get('themes', 'themes', Array($ref, 'name')); 
	}
	
	public static function gethemes(){
		$conf = configs::get('themes', 'themes');
		foreach($conf as $k => &$theme){ $o[] = $k; }
		return $o;
	}
	
	public static function istheme($thm){
		$thms = self::gethemes();
		return (FALSE !== array_search($thm, $thms));
	}
   	
	private static function get_default(){ return configs::get('themes', 'default'); }
	
	private static function negotiateTheme(){
		$thms = self::gethemes();
		$bval = 0;
		foreach($thms as $k => $ref){
			if (!isset($first) ){ $first = $ref; }
			$brws = configs::get('themes', 'themes', Array($ref, 'browser'));
			if ( is_array($brws) ){
				foreach($brws as $brw => $val){
					if ( $brw == client::browser() AND $bval < $val ){ $bthm = $ref; }
				}
			}
		}
		if ( !isset($bthm) ){ return self::get_default(); }
		errors::raise("Theme negotiation for client browser (".client::browser().") : $bthm", CORE_LOG_NOTICE, 'THEME');
		return $bthm;
	}
	
	public static function get_active_conf($var){
		$b = configs::get('themes', 'themes', Array(self::$active, 'vars'));
		if ( FALSE === $b ){ return $b; }
		if ( isset($b[$var]) ){
			$active = self::get_variant_key($var, self::$active);
			if ( $active == 'custum' ){ return self::get_variant_key("custum_$var", self::$active); }
			if ( !is_array($b[$var]) ){ return $b[$var]; }
			//$var is an array, so many variant possible, let's see which one is active 
			return $b[$var][$active][$var];
		}
		return FALSE;
	}
	
	public static function get_variant_key($var, $theme){
		//multi img/css variant support, only return the key of the active option
		if ( self::$CC->is_updated($var.'_'.$theme) ){
			$new = self::$CC->get_updated($var.'_'.$theme);
			//errors::raise("Theme $theme, variant $var is updated to => $new", CORE_LOG_WARNING, 'THEME');
			if ( self::is_valid_variant_key($var, $new) ){ 
				//errors::raise("Theme $theme, variant $var is updated and valid, storing value", CORE_LOG_WARNING, 'THEME');
				self::$CC->store_updated($var.'_'.$theme); 
			} else {
				unset($new);
			}
			self::$CC->del_updated($var.'_'.$theme);
		} elseif ( self::$CC->is_stored($var.'_'.$theme) ){	//check storage
			$new = self::$CC->get_stored($var.'_'.$theme);
			if ( ! self::is_valid_variant_key($var, $new) ){
				unset($new);self::$CC->del_stored($var.'_'.$theme);
			}
		}
		if ( isset($new) ){ return $new; }
		return FALSE;
	}
	
	private static function is_valid_variant_key($var, $key){
		if ( $var = 'custum_css' ){ return TRUE; }
		if ( $var = 'custum_img' ){ return TRUE; }
		if ( $key = 'custum' ){ return configs::get('themes', 'themes', Array(self::$active, "custum_$var") ); }
		return ( FALSE !== configs::get('themes', 'themes', Array(self::$active, 'vars', $var, $key)) );
	}
	
	public static function template_define(){
		if ( FALSE === self::load() ){ return FALSE; }
 		$o['actif']	= self::$active;
 		$o['theme'] = self::getname();
 		$o['js'] 	= self::get_active_conf('js');
 		$o['img'] 	= self::get_active_conf('img');
 		$o['css'] 	= self::get_active_conf('css');
 		//maybe active theme got some vars too.
 		if ( method_exists(self::$THM, 'template_define') ){ $o = array_merge($o, self::$THM->template_define);	}
 		return $o;
 	}
	
	//CALLBACKS to active theme
	public static function special_events(){
		if ( FALSE === self::load() ){ return FALSE; }
		return self::$THM->special_events();
	}
	
	public static function send_header($data=Array()){
		if ( FALSE === self::load() ){ return FALSE; }
		return self::$THM->send_header($data);
	}
	
	public static function send_content($c){
		if ( FALSE === self::load() ){ return FALSE; }
		return self::$THM->send_content($c);
	}
	
	public static function send_footer($data=Array()){
		if ( FALSE === self::load() ){ return FALSE; }
		return self::$THM->send_footer($data);
	}
	
	public static function get_features(){
		if ( FALSE === self::load() ){ return FALSE; }
		return self::$THM->getfeats();
	}

	
}