<?php

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

	Copyright (C) 2007  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 tpl_data {
	
	private static $CACHE;
	private static $FETCH;
	
	public static function newcontext(){
		$c = CORE::hash(NULL, 5);
		self::$CACHE[$c] = Array();
		return $c;
	}
	
	public static function clearcontext($c){
		if ( ! isset(self::$CACHE[$c]) ){ 
			errors::raise("Data Context '$c' could not cleared, does not exists", CORE_LOG_ERROR, 'TPL');
			return FALSE; 
		}
		unset(self::$CACHE[$c]);
		return TRUE;
	}
	
	public static function setdata($c, $data){
		if ( ! isset(self::$CACHE[$c]) ){ 
			errors::raise("Unknow Data Context '$c', data could not be set", CORE_LOG_ERROR, 'TPL');
			return FALSE; 
		}
		if ( !is_array($data) ){ 
			errors::raise("SetData expect second parameters to be an array, in context '$c'", CORE_LOG_ERROR, 'TPL');
			return FALSE;
		}
		//echo "Setting Cache $c value to : ";print_r($data);echo "<br/>\n";
		self::$CACHE[$c] = $data;
		return TRUE;
	}
	
	public static function appendata($c, $data, $k){
		if ( ! isset(self::$CACHE[$c]) ){ 
			errors::raise("Unknow Data Context '$c', data could not be append to $k", CORE_LOG_ERROR, 'TPL');
			return FALSe;
		}
		//echo "Append To Cache $c as k $k : $data<br/>\n";
		self::$CACHE[$c][$k] = $data;
		return TRUE;
	}
	
	public static function fetch($c, $k=NULL){
		if ( ! isset(self::$CACHE[$c]) ){ 
			$err = new error("Unknow Data Context '$c', data could not be fetched", CORE_LOG_ERROR, 'TPL');
			return $err; 
		}
		if ( !isset(self::$FETCH[$c]) ){ self::$FETCH[$c] = -1; }
		$i=0;
		reset(self::$CACHE[$c]);
		foreach(self::$CACHE[$c] as $k => $val ){
			if ( $i > self::$FETCH[$c] ){ 
				self::$FETCH[$c] = $i; 
				return Array($k, $val);
			}
			$i++;
		}
		self::$FETCH[$c] = -1;
		return FALSE;
	}
	
	//fetch context data one by one, return array($k, $val);
	public static function fetch_strings($c, $k=NULL){
		if ( ! isset(self::$CACHE[$c]) ){ 
			$err = new error("Unknow Data Context '$c', data could not be fetched", CORE_LOG_ERROR, 'TPL');
			return $err; 
		}
		if ( !isset(self::$FETCH[$c]) ){ self::$FETCH[$c] = -1; }
		$i=0;
		reset(self::$CACHE[$c]);
		foreach(self::$CACHE[$c] as $k => $val ){
			if ( $i > self::$FETCH[$c] AND ! is_array($val) ){ 
				self::$FETCH[$c] = $i; 
				//echo "Strings for $c return $k => $val<br/>\n";
				return Array($k, $val);
			}
			$i++;
		}
		self::$FETCH[$c] = -1;
		return FALSE;
	}
	
	public static function fetch_arrays($c, $k=NULL){
		if ( ! isset(self::$CACHE[$c]) ){ 
			$err = new error("Unknow Data Context '$c', data could not be fetched", CORE_LOG_ERROR, 'TPL');
			return $err; 
		}
		if ( !isset(self::$FETCH[$c]) ){ self::$FETCH[$c] = -1;}
		$i=0;
		reset(self::$CACHE[$c]);
		foreach(self::$CACHE[$c] as $k => $val ){
			if ( $i > self::$FETCH[$c] AND is_array($val) ){
				self::$FETCH[$c] = $i; 
				//echo "Arrays for $c return $k => $val<br/>\n";
				return Array($k, $val);
			}
			$i++;
		}
		self::$FETCH[$c] = -1;
		return FALSE;
	}
	
	public static function fetch_reset($c){
		if ( ! isset(self::$CACHE[$c]) ){ 
			errors::raise("Unknow Data Context '$c', data fetch counter could not be reset", CORE_LOG_ERROR, 'TPL');
			return FALSE;
		}
		self::$FETCH[$c] = -1;
		reset(self::$CACHE[$c]);
		return TRUE;
	}
	
}