<?php
/*
 * e107 website system
 *
 * Copyright (C) 2001-2008 e107 Inc (e107.org)
 * Released under the terms and conditions of the
 * GNU General Public License (http://www.gnu.org/licenses/gpl.txt)
 *
 * e107 Base Model
 *
 * $Source: /cvs_backup/e107_0.8/e107_handlers/model_class.php,v $
 * $Revision: 1.30 $
 * $Date: 2009-11-04 17:29:26 $
 * $Author: secretr $
*/

if (!defined('e107_INIT')) { exit; }

/**
 * Base e107 Model class
 * 
 * @package e107
 * @category e107_handlers
 * @version 1.0
 * @author SecretR
 * @copyright Copyright (C) 2009, e107 Inc.
 */
class e_model
{
    /**
     * Object data
     *
     * @var array
     */
    protected $_data = array();
	
    /**
     * Data structure (types) array, required for {@link e_admin_model::sanitize()} method, 
     * it also serves as a map (find data) for building DB queries,
     * copy/sanitize posted data to object data, etc.
     * 
     * This can/should be overwritten by extending the class
     *
     * @var array
     */
    protected $_data_fields = array();
	
	/**
	 * Current model DB table, used in all db calls
	 * 
	 * This can/should be overwritten/set by extending the class
	 * 
	 * @var string
	 */
	protected $_db_table;
    
    /**
     * Runtime cache of parsed from {@link _getData()} keys
     *
     * @var array
     */
    protected $_parsed_keys = array();
	
    /**
     * Avoid DB calls if data is not changed
     *
     * @see _setData()
     * @var boolean
     */
    protected $data_has_changed = false;
    
    /**
    * Name of object id field
    * Required for {@link getId()()} method
    *
    * @var string
    */
    protected $_field_id;
	
	/**
	 * Namespace to be used for model related system messages in {@link eMessage} handler
	 * 
	 * @var string 
	 */
	protected $_message_stack = 'default';
	
	/**
	 * Model parameters passed mostly from external sources
	 * 
	 * @var array
	 */
	protected $_params = array();
	
    /**
     * Constructor - set data on initialization
     *
     * @param array $data
     */
	function __construct($data = array())
	{
		$this->setData($data);
	}
	
	/**
	 * Optional DB table - used for auto-load data from the DB
	 * @param string $table
	 * @return e_model
	 */	
	public function getModelTable()
	{
		return $this->_db_table;
	}

	/**
	 * Set model DB table
	 * @param string $table
	 * @return e_model
	 */	
	public function setModelTable($table)
	{
		$this->_db_table = $table;
		return $this;
	}
	
    /**
     * Get data fields array
     * @return array
     */
    public function getDataFields()
    {
    	return $this->_data_fields;
    }
	
    /**
     * Set Predefined data fields in format key => type
     * @return e_model
     */
    public function setDataFields($data_fields)
    {
    	$this->_data_fields = $data_fields;
		return $this;
    }
    
    /**
     * Set name of object's field id
     *
     * @see getId()
     * 
     * @param   string $name
     * @return  e_model
     */
    public function setFieldIdName($name)
    {
        $this->_field_id = $name;
        return $this;
    }

    /**
     * Retrieve name of object's field id
     *
     * @see getId()
     * 
     * @param   string $name
     * @return  string
     */
    public function getFieldIdName()
    {
        return $this->_field_id;
    }

    /**
     * Retrieve object primary id field value
     *
     * @return integer
     */
    public function getId()
    {
        if ($this->getFieldIdName()) 
        {
            return $this->get($this->getFieldIdName(), 0);
        }
        return $this->get('id', 0);
    }
	
    /**
     * Set object primary id field value
     *
     * @return e_model
     */
    public function setId($id)
    {
        if ($this->getFieldIdName()) 
        {
            return $this->set($this->getFieldIdName(), intval($id));
        }
        return $this;
    }
    
    /**
     * Retrieves data from the object ($_data) without
     * key parsing (performance wise, prefered when possible)
     *
     * @see _getDataSimple()
     * @param string $key
     * @param mixed $default
     * @return mixed
     */
	public function get($key, $default = null)
    {
    	return $this->_getDataSimple((string) $key, $default);
    }
    
    /**
     * Retrieves data from the object ($_data)
     * If $key is empty, return all object data
     *
     * @see _getData()
     * @param string $key
     * @param mixed $default
     * @param integer $index
     * @return mixed
     */
	public function getData($key = '', $default = null, $index = null)
    {
    	return $this->_getData($key, $default, $index);
    }
    
    /**
     * Overwrite data in the object for a single field. Key is not parsed.
     * Public proxy of {@link _setDataSimple()}
     * Data isn't sanitized so use this method only when data comes from trustable sources (e.g. DB)
     * 
     *
     * @see _setData()
     * @param string $key
     * @param mixed $value
     * @param boolean $strict update only
     * @return e_model
     */
	public function set($key, $value = null, $strict = false)
    {
    	return $this->_setDataSimple($key, $value, $strict);
    }
    
    /**
     * Overwrite data in the object. Public proxy of {@link _setData()}
     * Data isn't sanitized so use this method only when data comes from trustable sources (e.g. DB)
     *
     * @see _setData()
     * @param string|array $key
     * @param mixed $value
     * @param boolean $strict update only
     * @return e_model
     */
	public function setData($key, $value = null, $strict = false)
    {
    	return $this->_setData($key, $value, $strict);
    }
    
    /**
     * Add data to the object.
     * Retains existing data in the object.
     * Public proxy of {@link _addData()}
     * 
     * If $override is false, data will be updated only (check against existing data)
     * 
     * @param string|array $key
     * @param mixed $value
     * @param boolean $override override existing data
     * @return e_model
     */
    public function addData($key, $value = null, $override = true)
    {
    	return $this->_addData($key, $value, $override);
    }
    
	/**
     * Unset single field from the object.
     * Public proxy of {@link _unsetDataSimple()}
     *
     * @param string $key
     * @return e_model
     */
    public function remove($key)
    {
    	return $this->_unsetDataSimple($key);
    }
    
	/**
     * Unset data from the object.
     * $key can be a string only. Array will be ignored.
     * '/' inside the key will be treated as array path
     * if $key is null entire object will be reset
     * 
     * Public proxy of {@link _unsetData()}
     *
     * @param string|null $key
     * @return e_model
     */
    public function removeData($key = null)
    {
    	return $this->_unsetData($key);
    }
    
    /**
     * @param string $key
     * @return boolean
     */
    public function has($key)
    {
    	return $this->_hasData($key);
    }
    
    /**
     * @param string $key
     * @return boolean
     */
    public function hasData($key = '')
    {
    	return $this->_hasData($key);
    }
	
    /**
     * @param string $key
     * @return boolean
     */
    public function is($key)
    {
    	return (isset($this->_data[$key]));
    }
    
    /**
     * @param string $key
     * @return boolean
     */
    public function isData($key)
    {
    	return $this->_isData($key);
    }
    
    /**
     * Retrieves data from the object
     *
     * If $key is empty will return all the data as an array
     * Otherwise it will return value of the attribute specified by $key
     * '/' inside the key will be treated as array path (x/y/z equals to [x][y][z]
     *
     * If $index is specified it will assume that attribute data is an array
     * and retrieve corresponding member.
     *
     * @param string $key
     * @param mixed $default
     * @param integer $index
     * @param boolean $posted data source
     * @return mixed
     */
    protected function _getData($key = '', $default = null, $index = null, $data_src = '_data')
    {
    	$key = trim($key, '/');
        if ('' === $key) 
        {
            return $this->$data_src;
        }

        if (strpos($key, '/'))
        {
        	if(isset($this->_parsed_keys[$data_src.'/'.$key]))
        	{
        		return $this->_parsed_keys[$data_src.'/'.$key];
        	}
            $keyArr = explode('/', $key);
            $data = $this->$data_src;
            foreach ($keyArr as $k) 
            {
                if ('' === $k) 
                {
                    return $default;
                }
                if (is_array($data)) 
                {
                    if (!isset($data[$k])) 
                    {
                        return $default;
                    }
                    $data = $data[$k];
                }
                else 
                {
                    return $default;
                }
            }
            $this->_parsed_keys[$data_src.'/'.$key] = $data;
            return $data;
        }

        //get $index
        if (isset($this->{$data_src}[$key])) 
        {
            if (null === $index) 
            {
                return $this->{$data_src}[$key];
            }

            $value = $this->{$data_src}[$key];
            if (is_array($value)) 
            {
                if (isset($value[$index])) 
                {
                    return $value[$index];
                }
                return $default;
            } 
            elseif (is_string($value)) 
            {
                $arr = explode("\n", $value);
                return (isset($arr[$index]) ? $arr[$index] : $default);
            }
            return $default;
        }
        return $default;
    }
    
    /**
     * Get value from _data array without parsing the key
     *
     * @param string $key
     * @param mixed $default
     * @param string $posted data source
     * @return mixed
     */
    protected function _getDataSimple($key, $default = null, $data_src = '_data')
    {
        return isset($this->{$data_src}[$key]) ? $this->{$data_src}[$key] : $default;
    }
    
    /**
     * Overwrite data in the object.
     *
     * $key can be string or array.
     * If $key is string, the attribute value will be overwritten by $value
     * '/' inside the key will be treated as array path
     *
     * If $key is an array and $strict is false, it will overwrite all the data in the object.
     * 
     * If $strict is true and $data_src is '_data', data will be updated only (no new data will be added)
     *
     * @param string|array $key
     * @param mixed $value
     * @param boolean $strict
     * @param string $data_src
     * @return e_model
     */
    protected function _setData($key, $value = null, $strict = false, $data_src = '_data')
    {
        if(is_array($key)) 
        {
            if($strict)
	    	{
				foreach(array_keys($key) as $k) 
		        {
		        	$this->_setData($k, $key[$k], true, $data_src);
		        }
		        return $this;
	    	}

            $this->${data_src} = $key;
            return $this;
        } 
        
        //multidimensional array support - strict _setData for values of type array
    	if($strict && !empty($value) && is_array($value))
       	{
			foreach($value as $k => $v)
			{
			    $this->_setData($key.'/'.$k, $v, true, $data_src);
			}
			return $this;
       	}
        
        //multidimensional array support - parse key
        $key = trim($key, '/');
        if(strpos($key,'/')) 
        {
        	//if strict - update only
	        if($strict && !$this->isData($key))
	        {
	        	return $this;
	        }
	        
        	$keyArr = explode('/', $key);
        	$data = &$this->{$data_src};
            for ($i = 0, $l = count($keyArr); $i < $l; $i++) 
            {
	            $k = $keyArr[$i];
		        
	            if (!isset($data[$k])) 
	            {
	                $data[$k] = array();
	            }
	            $data = &$data[$k];
	        }
            
	        //data has changed - optimized
	        if('_data' === $data_src && !$this->data_has_changed)
	        {
	        	$this->data_has_changed = (!isset($this->_data[$key]) || $this->_data[$key] != $value);
	        }
	        $this->_parsed_keys[$data_src.'/'.$key] = $value;
	        $data = $value;
        }
        else 
        {
			//if strict - update only
	        if($strict && !isset($this->_data[$key]))
	        {
	        	return $this;
	        }
        	if('_data' === $data_src && !$this->data_has_changed)
	        {
	        	$this->data_has_changed = (!isset($this->_data[$key]) || $this->{$data_src}[$key] != $value);
	        }
            $this->{$data_src}[$key] = $value;
        }

        return $this;
    }
    
    /**
     * Set data for the given source. More simple (and performance wise) version
     * of {@link _setData()}
     *
     * @param string $key
     * @param mixed $value
     * @param boolean $strict
     * @param string $data_src
     * @return e_model
     */
	protected function _setDataSimple($key, $value = null, $strict = false, $data_src = '_data')
    {
    	$key = $key.'';//smart toString
    	if(!$strict)
    	{
			//data has changed
	        if('_data' === $data_src && !$this->data_has_changed)
	        {
	        	$this->data_has_changed = (!isset($this->_data[$key]) || $this->_data[$key] != $value);
	        }
	        $this->{$data_src}[$key] = $value;
    		return $this;
    	}
    	
    	if($this->isData($key))
    	{
			if('_data' === $data_src && !$this->data_has_changed)
	        {
	        	$this->data_has_changed = (!isset($this->_data[$key]) || $this->_data[$key] != $value);
	        }
	        $this->{$data_src}[$key] = $value;
    	}

    	return $this;
    }
    
    /**
     * Add data to the object.
     * Retains existing data in the object.
     * 
     * If $override is false, only new (non-existent) data will be added
     * 
     * @param string|array $key
     * @param mixed $value
     * @param boolean $override allow override of existing data
     * @param string $data_src data source
     * @return e_model
     */
    protected function _addData($key, $value = null, $override = true, $data_src = '_data')
    {
    	if(is_array($key))
    	{
			foreach($key as $k => $v)
			{
			    $this->_addData($k, $v, $override, $data_src);
			}
			return $this;
    	}
    	
		if($override || !$this->_isData($key, $data_src))
       	{
       		if(is_array($value))
       		{
				if(is_array($key))
				{
					foreach($key as $k => $v)
					{
					    $this->_addData($key.'/'.$k, $v, $override, $data_src);
					}
				}
				return $this;
       		}
       		$this->_setData($key, $value, false, $data_src);
       	}
        return $this;
    }
    
    /**
     * Unset data from the object from the given source.
     * $key can be a string only. Array will be ignored.
     * '/' inside the key will be treated as array path
     * if $key is null entire object will be reset
     *
     * @param string|null $key
     * @param string $data_src data source
     * @return e_model
     */
    protected function _unsetData($key = null, $data_src = '_data')
    {
        if (null === $key) 
        {
        	if('_data' === $data_src && !empty($this->_data))
        	{
        		$this->data_has_changed = true;
        	}
        	$this->{$data_src} = array();
            return $this;
        } 
		
        $key = trim($key, '/');
        if(strpos($key,'/')) 
        {
        	$keyArr = explode('/', $key);
        	$data = &$this->{$data_src};
        	
        	$unskey = array_pop($keyArr);
            for ($i = 0, $l = count($keyArr); $i < $l; $i++) 
            {
	            $k = $keyArr[$i];
	            if (!isset($data[$k])) 
	            {
	                return $this; //not found
	            }
	            $data = &$data[$k];
	        }
	        if(is_array($data))
	        {
				if('_data' === $data_src && isset($data[$unskey]))
	        	{
	        		$this->data_has_changed = true;
	        	}
	        	unset($data[$unskey], $this->_parsed_keys[$data_src.'/'.$key]);
	        }
        }
        else 
        {
       		if('_data' === $data_src && isset($this->{$data_src}[$key]))
        	{
        		$this->data_has_changed = true;
        	}
            unset($this->{$data_src}[$key]);
        }
        return $this;
    }
    
	/**
     * Unset single field from the object from the given source. Key is not parsed
     *
     * @param string $key
     * @param string $data_src data source
     * @return e_model
     */
    protected function _unsetDataSimple($key, $data_src = '_data')
    {
		if('_data' === $data_src && isset($this->{$data_src}[$key]))
       	{
       		$this->data_has_changed = true;
       	}
    	unset($this->{$data_src}[$key]);
    	return $this;
    }

    /**
     * If $key is empty, checks whether there's any data in the object
     * Otherwise checks if the specified key is empty/set.
     *
     * @param string $key
     * @param string $data_src data source
     * @return boolean
     */
    protected function _hasData($key = '', $data_src = '_data')
    {
        if (empty($key)) 
        {
            return !empty($this->$data_src);
        }
        $value = $this->_getData($key, null, null, $data_src);
        return !empty($value);
    }
    
    /**
     * Checks if the specified key is set
     *
     * @param string $key
     * @param string $data_src data source
     * @return boolean
     */
    protected function _isData($key, $data_src = '_data')
    {
        return (null !== $this->_getData($key, null, null, $data_src));
    }

	/**
	 * Add system message of type Information
	 * 
	 * @param string $message
	 * @param boolean $session [optional]
	 * @return e_model
	 */
	public function addMessageInfo($message, $session = false)
	{
		e107::getMessage()->addStack($message, $this->_message_stack, E_MESSAGE_INFO, $session);
		return $this;
	}
	
	/**
	 * Add system message of type Success
	 * 
	 * @param string $message
	 * @param boolean $session [optional]
	 * @return e_model
	 */
	public function addMessageSuccess($message, $session = false)
	{
		e107::getMessage()->addStack($message, $this->_message_stack, E_MESSAGE_SUCCESS, $session);
		return $this;
	}
	
	/**
	 * Add system message of type Warning
	 * 
	 * @param string $message
	 * @param boolean $session [optional]
	 * @return e_model
	 */
	public function addMessageWarning($message, $session = false)
	{
		e107::getMessage()->addStack($message, $this->_message_stack, E_MESSAGE_WARNING, $session);
		return $this;
	}
	
	/**
	 * Add system message of type Error
	 * 
	 * @param string $message
	 * @param boolean $session [optional]
	 * @return e_model
	 */
	public function addMessageError($message, $session = false)
	{
		e107::getMessage()->addStack($message, $this->_message_stack, E_MESSAGE_ERROR, $session);
		return $this;
	}
	
	/**
	 * Add system message of type Information
	 * 
	 * @param string $message
	 * @param boolean $session [optional]
	 * @return e_model
	 */
	public function addMessageDebug($message, $session = false)
	{
		e107::getMessage()->addStack($message, $this->_message_stack, E_MESSAGE_DEBUG, $session);
		return $this;
	}
	
    /**
     * Render System messages (if any)
     * 
     * @param boolean $session store messages to session
     * @param boolean $reset reset errors
     * @return string
     */
    public function renderMessages($session = false, $reset = true)
    {
    	return e107::getMessage()->render($this->_message_stack, $session, $reset);
    }
	
    /**
     * Move model System messages (if any) to the default eMessage stack
     * 
     * @param boolean $session store messages to session
     * @return e_model
     */
    public function setMessages($session = false)
    {
    	e107::getMessage()->moveStack($this->_message_stack, 'default', false, $session);
		return $this;
    }
	
    /**
     * User defined model validation
     * Awaiting for child class implementation
     *
     */
    public function verify()
    {
    }
	
    /**
     * Model validation 
     * @see e_model_admin
     */
    public function validate()
    {
    }
    
    /**
     * Generic load data from DB
     * @param boolean $force
     * @return e_admin
     */
	public function load($id, $force = false)
	{
		if($this->hasData() && !$force)
		{
			return $this;
		}
		$id = intval($id);
		
		$qry = str_replace('{ID}', $id, $this->getParam('db_query'));
		if(!$qry)
		{
			$qry = '
				SELECT * FROM #'.$this->getModelTable().' WHERE '.$this->getFieldIdName().'='.$id.'
			';
		}
		//TODO - error reporting
		$sql = e107::getDb();
		if($sql->db_Select_gen($qry))
		{
			$this->setData($sql->db_Fetch());
		}
		return $this;
	}
    
    /**
     * Save data to DB
     * Awaiting for child class implementation
     * @see e_model_admin
     */
    public function save()
    {
    }
    
    /**
     * Insert data to DB
     * Awaiting for child class implementation
     * @see e_model_admin
     */
    public function dbInsert()
    {
    }
    
    /**
     * Update DB data
     * Awaiting for child class implementation
     * @see e_model_admin
     */
    public function dbUpdate()
    {
    }
	
    /**
     * Replace DB record
     * Awaiting for child class implementation
     * @see e_model_admin
     */
    public function dbReplace()
    {
    }
	
    /**
     * Delete DB data
     * Awaiting for child class implementation
     * @see e_model_admin
     */
    public function dbDelete()
    {
    }
	
	/**
	 * Set parameter array
	 * Core parameters:
	 * - db_query: string db query to be passed to load() ($sql->db_Select_gen())
	 * - model_class: e_tree_model class - string class name for creating nodes inside default load() method
	 *
	 * @param array $params
	 * @return e_model
	 */
	public function setParams(array $params)
	{
		$this->_params = $params;
		return $this;
	}
	
	/**
	 * Get parameter array
	 * 
	 * @return array parameters
	 */
	public function getParams()
	{
		return $this->_params;
	}
	
	/**
	 * Set parameter
	 * 
	 * @param string $key 
	 * @param mixed $value
	 * @return e_model
	 */
	public function setParam($key, $value)
	{
		$this->_params[$key] = $value;
		return $this;
	}
	
	/**
	 * Get parameter
	 *
	 * @param string $key
	 * @param mixed $default
	 */
	public function getParam($key, $default = null)
	{
		return (isset($this->_params[$key]) ? $this->_params[$key] : $default);
	}
	
	/**
	 * Try to convert string to a number
	 * Shoud fix locale related troubles
	 * 
	 * @param string $value
	 * @return 
	 */
	public function toNumber($value)
	{
		if(!is_numeric($value))
		{
			$larr = localeconv(); 
			$search = array($larr['decimal_point'], $larr['mon_decimal_point'], $larr['thousands_sep'], $larr['mon_thousands_sep'], $larr['currency_symbol'], $larr['int_curr_symbol']);
			$replace = array('.', '.', '', '', '', '');
			$value = str_replace($search, $replace, $value);
		}
		return (0 + $value);
	}
	
	/**
	 * Convert model object to array
	 * @return array object data
	 */
	public function toArray()
	{
		return $this->getData();
	}
	
	/**
	 * Convert object data to a string
	 *
	 * @param boolean $AddSlashes
	 * @param string $key optional, if set method will return corresponding value as a string
	 * @return string
	 */
	public function toString($AddSlashes = true, $key = null)
	{
		if (null !== $key)
		{
			$value = $this->getData($key);
			if(is_array($value))
			{
				return e107::getArrayStorage()->WriteArray($value, $AddSlashes);
			}
			return (string) $value;
		}
		return (string) e107::getArrayStorage()->WriteArray($this->getData(), $AddSlashes);
	}
	
	/**
	 * Magic method - convert object data to a string
	 * NOTE: before PHP 5.2.0 the __toString method was only 
	 * called when it was directly combined with echo() or print()
	 * 
	 * NOTE: PHP 5.3+ is throwing parse error if __toString has optional arguments.
	 *
	 * @param boolean $AddSlashes
	 * @return string
	 */
	public function __toString()
	{
		return $this->toString((@func_get_arg(0) === true));
	}
	
	public function destroy()
	{
		$this->_data = array();
		$this->_params = array();
		$this->_data_fields = array();
		$this->_parsed_keys = array();
		$this->_db_table = $this->_field_id = '';
		$this->data_has_changed = false;
	}
}

//FIXME - move e_model_admin to e_model_admin.php

/**
 * Base e107 Admin Model class
 * 
 * Some important points:
 * - model data should be always in toDB() format:
 * 		- retrieved direct from DB
 * 		- set & sanitized via setPostedData()->mergePostedData()
 * 		- manually sanitized before passed to model setter (set(), setData(), add(), addData(), etc.) methods 
 * - $_data_fields property is important, it tells to sanitize() method how to sanitize posted data
 * - if $_data_fields is missing, sanitize() will call internally e107::getParser()->toDB() on the data
 * - sanitize() is triggered by default on mergePostedData() and mergeData() methods
 * - mergePostedData() and mergeData() methods will filter posted/passed data against (in this order):
 * 		- getValidator()->getValidData() if true is passed as validate parameter (currently disabled, gather feedback)
 * 		- $_data_fields if true is passed as sanitize parameter
 * - toSqlQuery() needs $_data_fields and $_field_id to work proper, $_FIELD_TYPES is optional but recommended (faster SQL queries)
 * - result array from toSqlQuery() call will be filtered against $_data_fields
 * - in almost every case $_FIELD_TYPES shouldn't contain 'escape' and 'todb' - dont't forget you are going to pass already sanitized data (see above)
 * - most probably $_FIELD_TYPES will go in the future, $_data_fields alone could do the job
 * - default db related methods (save(), dbUpdate(), etc.) need $_db_table
 * 
 * @package e107
 * @category e107_handlers
 * @version 1.0
 * @author SecretR
 * @copyright Copyright (C) 2009, e107 Inc.
 */
class e_admin_model extends e_model
{
    /**
    * Posted data
    * Back-end related
    *
    * @var array
    */
    protected $_posted_data = array();
	
    /**
     * DB format array - see db::_getTypes() and db::_getFieldValue() (mysql_class.php)
     * for example
     * 
     * This can/should be overwritten by extending the class
     *
     * @var array
     */
    protected $_FIELD_TYPES = array();
    
    /**
     * Validation structure - see {@link e_validator::$_required_rules} for
     * more information about the array format.
     * Used in {@link validate()} method.
     * TODO - check_rules (see e_validator::$_optional_rules)
     * This can/should be overwritten by extending the class.
     *
     * @var array
     */
    protected $_validation_rules = array();
	
	/**
	 * @var integer Last SQL error number
	 */
	protected $_db_errno = 0;
    
    /**
     * Validator object
     * 
     * @var e_validator 
     */
    protected $_validator = null;
	
    /**
     * @return array
     */
    public function getValidationRules()
    {
    	return $this->_validation_rules;
    }
    
    /**
     * Set object validation rules if $_validation_rules array is empty
     * 
     * @param array $vrules
     * @return e_admin_model
     */
    public function setValidationRules(array $vrules)
    {
    	if(empty($this->_validation_rules))
    	{
    		$this->_validation_rules = $vrules;
    	}
    	return $this;
    }
	
    /**
     * Predefined data fields types, passed to DB handler
     * @return array
     */
    public function getFieldTypes()
    {
    	return $this->_FIELD_TYPES;
    }
	
    /**
     * Predefined data fields types, passed to DB handler
     * 
     * @param array $field_types
     * @return e_admin_model
     */
    public function setFieldTypes($field_types)
    {
    	$this->_FIELD_TYPES = $field_types;
		return $this;
    }
    
    /**
     * Retrieves data from the object ($_posted_data) without
     * key parsing (performance wise, prefered when possible)
     *
     * @see _getDataSimple()
     * @param string $key
     * @param mixed $default
     * @return mixed
     */
	public function getPosted($key, $default = null)
    {
    	return $this->_getDataSimple((string) $key, $default, '_posted_data');
    }
    
    /**
     * Retrieves data from the object ($_posted_data)
     * If $key is empty, return all object posted data
     * @see _getData()
     * @param string $key
     * @param mixed $default
     * @param integer $index
     * @return mixed
     */
	public function getPostedData($key = '', $default = null, $index = null)
    {
    	return $this->_getData($key, $default, $index, '_posted_data');
    }
    
    /**
     * Search for requested data from available sources in this order:
     * - posted data
     * - default object data
     * - passed default value
     * 
     * Use this method inside forms
     *
     * @param string $key
     * @param string $default
     * @param integer $index
     * @return string
     */
    public function getIfPosted($key, $default = '', $index = null)
    {
		if(null !== $this->getPostedData((string) $key))
		{
			return e107::getParser()->post_toForm($this->getPostedData((string) $key, null, $index));
		}
		return e107::getParser()->toForm($this->getData((string) $key, $default, $index));
    }
    
    /**
     * Overwrite posted data in the object for a single field. Key is not parsed.
     * Public proxy of {@link _setDataSimple()}
     * Use this method to store data from non-trustable sources (e.g. _POST) - it doesn't overwrite 
     * the original object data
     * 
     * @param string $key
     * @param mixed $value
     * @param boolean $strict update only
     * @param boolean $toForm use post_toForm() on both key and data arguments
     * @return e_admin_model
     */
    public function setPosted($key, $value, $strict = false, $toForm = true)
    {
    	if($toForm)
		{
			$tp = e107::getParser();
			$key = $tp->post_toForm($key);
			$value = $tp->post_toForm($value);
		}
        return $this->_setDataSimple($key, $value, $strict, '_posted_data');
    }
    
    /**
     * Overwrite posted data in the object. Key is parsed (multidmensional array support).
     * Public proxy of {@link _setData()}
     * Use this method to store data from non-trustable sources (e.g. _POST) - it doesn't overwrite 
     * the original object data
     *
     * @param string|array $key
     * @param mixed $value
     * @param boolean $strict update only
     * @param boolean $toForm use post_toForm() on both key and data arguments
     * @return e_admin_model
     */
    public function setPostedData($key, $value = null, $strict = false, $toForm = true)
    {
    	if($toForm)
		{
			$tp = e107::getParser();
			$key = $tp->post_toForm($key);
			$value = $tp->post_toForm($value);
		}
        return $this->_setData($key, $value, $strict, '_posted_data');
    }
    
    /**
     * Add data to the object.
     * Retains existing data in the object.
     * Public proxy of {@link _addData()}
     * 
     * If $override is false, data will be updated only (check against existing data)
     * 
     * @param string|array $key
     * @param mixed $value
     * @param boolean $override override existing data
     * @param boolean $toForm use post_toForm() on both key and data arguments
     * @return e_admin_model
     */
    public function addPostedData($key, $value = null, $override = true, $toForm = true)
    {
    	if($toForm)
		{
			$tp = e107::getParser();
			$key = $tp->post_toForm($key);
			$value = $tp->post_toForm($value);
		}
    	return $this->_addData($key, $value, $override, '_posted_data');
    }
    
	/**
     * Unset single posted data field from the object.
     * Public proxy of {@link _unsetDataSimple()}
     *
     * @param string $key
     * @return e_admin_model
     */
    public function removePosted($key)
    {
    	return $this->_unsetDataSimple($key, '_posted_data');
    }
    
	/**
     * Unset posted data from the object.
     * $key can be a string only. Array will be ignored.
     * '/' inside the key will be treated as array path
     * if $key is null entire object will be reset
     * 
     * Public proxy of {@link _unsetData()}
     *
     * @param string|null $key
     * @return e_admin_model
     */
    public function removePostedData($key = null)
    {
    	return $this->_unsetData($key, '_posted_data');
    }

    /**
     * Check if given key exists and non-empty in the posted data array
     * @param string $key
     * @return boolean
     */
    public function hasPosted($key)
    {
    	return $this->_hasData($key, '_posted_data');
    }
    
	/**
	 * Check if posted data is empty
	 * @return boolean
	 */
    public function hasPostedData()
    {
    	return $this->_hasData('', '_posted_data');
    }
	
    /**
     * Check if given key exists in the posted data array
     * 
     * @param string $key
     * @return boolean
     */
    public function isPosted($key)
    {
    	return (isset($this->_posted_data[$key]));
    }
    
    /**
     * Check if given key exists in the posted data array ($key us parsed)
     * 
     * @param string $key
     * @return boolean
     */
    public function isPostedData($key)
    {
    	return $this->_isData($key, '_posted_data');
    }
    
    /**
     * Compares posted data vs object data
     *
     * @param string $field
     * @param boolean $strict compare variable type as well
     * @return boolean
     */
    public function dataHasChangedFor($field, $strict = false)
    {
        $newData = $this->getData($field);
        $postedData = $this->getPostedData($field);
        return ($strict ? $newData !== $postedData : $newData != $postedData);
    }
    
    /**
     * @return boolean
     */
    public function dataHasChanged()
    {
        return $this->data_has_changed;
    }
	
    /**
     * Merge posted data with the object data
     * Should be used on edit/update/create record (back-end)
     * Retrieved for copy Posted data will be removed (no matter if copy is successfull or not)
     * 
     * If $strict is true, only existing object data will be copied (update)
     * If $validate is true, data will be copied only after successful validation
     *
     * @param boolean $strict 
     * @param boolean $sanitize sanitize posted data before move it to the object data
     * @param boolean $validate perform validation check
     * @return e_admin_model
     */
    public function mergePostedData($strict = true, $sanitize = true, $validate = true)
    {
    	if(!$this->hasPostedData() || ($validate && !$this->validate()))
    	{
    		return $this; 
    	}
    	
		/* XXX - Wrong? Should validator keep track on validated data at all?
		// retrieve only valid data
		if($validate) 
		{
			$data = $this->getValidator()->getValidData();
		}
		else // retrieve all posted data
		{
			$data = $this->getPostedData();
		}*/
		
		$data = $this->getPostedData();
		if($sanitize)
		{
			// search for db_field types
			if($this->getDataFields())
			{
				$data = $this->sanitize($data);
			}
			else //no db field types, use toDB()
			{
				$tp = e107::getParser();
				$data = $tp->toDB($data);
			}
		}
		
    	foreach ($data as $field => $dt) 
    	{
    		$this->setData($field, $dt, $strict)
    			->removePostedData($field);
    	}
    	return $this;
    }
    
    /**
     * Merge passed data array with the object data
     * Should be used on edit/update/create record (back-end)
     * 
     * If $strict is true, only existing object data will be copied (update)
     * If $validate is true, data will be copied only after successful validation
     *
     * @param array $src_data
     * @param boolean $sanitize
     * @param boolean $validate perform validation check
     * @return e_admin_model
     */
    public function mergeData(array $src_data, $strict = true, $sanitize = true, $validate = true)
    {
    	//FIXME
    	if(!$src_data || ($validate && !$this->validate($src_data)))
    	{
    		return $this;
    	}
		
		/* Wrong?
		// retrieve only valid data
		if($validate) 
		{
			$src_data = $this->getValidator()->getValidData();
		}*/
    	
		if($sanitize)
		{
			// search for db_field types
			if($this->getDataFields())
			{
				$src_data = $this->sanitize($src_data);
			}
			else //no db field types, use toDB()
			{
				$src_data = $tp->toDB($src_data);
			}
		}
   		
		foreach ($src_data as $key => $value)
		{
			$this->setData($key, $value, $strict);
		}
   		
    	return $this;
    }
    
    /**
     * Validate posted data:
     * 1. validate posted data against object validation rules
     * 2. add validation errors to the object if any
     * 3. return true for valid and false for non-valid data
     *
     * @param array $data optional - data for validation, defaults to posted data
     * @return boolean
     */
    public function validate($data = null)
    {
    	if(!$this->getValidationRules())
    	{
    		return true;
    	}
		if(null === $data) 
		{
			$data = $this->getPostedData();
		}
		return $this->getValidator()->validate($data);
    }
	
    /**
     * User defined model validation
     * Awaiting for child class implementation
     *
     */
    public function verify()
    {
    }
    
	/**
	 * @return e_validator
	 */
	public function getValidator()
	{
		if(null === $this->_validator)
		{
			$this->_validator = e107::getObject('e_validator');
			$this->_validator->setRules($this->getValidationRules())->setMessageStack($this->_message_stack.'_validator');
			//TODO - optional check rules
		}
		return $this->_validator;
	}

	/**
	 * Add custom validation message.
	 * $field_type and $error_code will be inserted via sprintf()
	 * in the $message string
	 * Example: 
	 * <code>
	 * $model->addValidationError('Custom error message [#%d] for %s', 'My Field', 1000); 
	 * //produces 'Custom error message [#1000] for My Field'
	 * </code>
	 * 
	 * @param string $message
	 * @param string $field_title [optional]
	 * @param integer $error_code [optional]
	 * @return 
	 */
	public function addValidationError($message, $field_title = '', $error_code = '')
	{
		$this->getValidator()->addValidateMessage($field_title, $error_code, $message);
		return $this;
	}
    
    /**
     * Render validation errors (if any)
     * 
     * @param boolean $session store messages to session
     * @param boolean $reset reset errors
     * @return string
     */
    public function renderValidationErrors($session = false, $reset = true)
    {
		return $this->getValidator()->renderValidateMessages($session, $reset);
    }
	
    /**
     * Render System messages (if any)
     * 
     * @param boolean $validation render validation messages as well
     * @param boolean $session store messages to session
     * @param boolean $reset reset errors
     * @return string
     */
    public function renderMessages($validation = true, $session = false, $reset = true)
    {
    	if($validation)
		{
			e107::getMessage()->moveStack($this->_message_stack.'_validator', $this->_message_stack, false, $session);
		}
		return parent::renderMessages($session, $reset);
    }
	
    /**
     * Move model System messages (if any) to the default eMessage stack
     * 
     * @param boolean $validation move validation messages as well
     * @param boolean $session store messages to session
     * @return e_admin_model
     */
    public function setMessages($validation = true, $session = false)
    {
    	if($validation)
		{
			e107::getMessage()->moveStack($this->_message_stack.'_validator', 'default', false, $session);
		}
    	parent::setMessages($session);
		return $this;
    }

    /**
     * @return boolean
     */
    public function hasValidationError()
    {
    	return $this->getValidator()->isValid();
    }
	
    /**
     * @return boolean
     */
    public function hasSqlError()
    {
    	return !empty($this->_db_errno);
    }
	
    /**
     * @return boolean
     */
    public function hasError()
    {
    	return ($this->hasValidationError() || $this->hasSqlError());
    }
	
    /**
     * Generic load data from DB
     * @param boolean $force
     * @return e_admin_model
     */
	public function load($id, $force = false)
	{
		parent::load($id, $force);
		
		$this->_db_errno = e107::getDb()->getLastErrorNumber();
		if($this->_db_errno)
		{
			$this->addMessageError('SQL Update Error', $session_messages); //TODO - Lan
			$this->addMessageDebug('SQL Error #'.$this->_db_errno.': '.e107::getDb()->getLastErrorText());
		}
		return $this;
	}
	
    /**
     * Save data to DB
     * 
     * @param boolen $from_post
     */
    public function save($from_post = true, $force = false, $session_messages = false)
    {
    	if(!$this->getFieldIdName())
		{
			return false;
		}
		
		if($from_post)
		{
			//no strict copy, validate & sanitize 
			$this->mergePostedData(false, true, true);
		}
		
		if($this->getId())
		{
			return $this->dbUpdate($force, $session_messages);
		}
		
		return $this->dbInsert($force, $session_messages);
    }
	
	public function delete($destroy = true, $session_messages = false)
	{
		$ret = $this->dbDelete();
		if($ret)
		{
			if($destroy)
			{
				$this->setMessages(true, $session_messages)->destroy();
			}
		}
		return $ret;
	}
    
    /**
     * Insert data to DB
     * 
     * @param boolean $force force query even if $data_has_changed is false
     * @param boolean $session_messages to use or not session to store system messages
     */
    public function dbInsert($force = false, $session_messages = false)
    {
    	$this->_db_errno = 0;
		if($this->hasError() || (!$this->data_has_changed && !$force))
		{
			return 0;
		}
		
		$res = e107::getDb()->db_Insert($this->getModelTable(), $this->toSqlQuery('create'));
		if(!$res)
		{
			$this->_db_errno = e107::getDb()->getLastErrorNumber();
			$this->addMessageError('SQL Insert Error', $session_messages); //TODO - Lan
			$this->addMessageDebug('SQL Error #'.$this->_db_errno.': '.e107::getDb()->getLastErrorText());
			return false;
		}
		
		// Set the reutrned ID
		$this->setId($res);
		$this->addMessageSuccess(LAN_CREATED);
		
		return $res;
    }
	
    /**
     * Replace data in DB
     * 
     * @param boolean $force force query even if $data_has_changed is false
     * @param boolean $session_messages to use or not session to store system messages
     */
    public function dbReplace($force = false, $session_messages = false)
    {
    	$this->_db_errno = 0;
		if($this->hasError() || (!$this->data_has_changed && !$force))
		{
			return 0;
		}
		
		$res = e107::getDb()->db_Insert($this->getModelTable(), $this->toSqlQuery('replace'));
		if(!$res)
		{
			$this->_db_errno = e107::getDb()->getLastErrorNumber();
			if($this->_db_errno)
			{
				$this->addMessageError('SQL Replace Error', $session_messages); //TODO - Lan
				$this->addMessageDebug('SQL Error #'.$this->_db_errno.': '.e107::getDb()->getLastErrorText());
			}
		}
		
		return $res;
    }
    
    /**
     * Update DB data
     * 
     * @param boolean $force force query even if $data_has_changed is false
     * @param boolean $session_messages to use or not session to store system messages
     */
    public function dbUpdate($force = false, $session_messages = false)
    {
    	$this->_db_errno = 0;
		if($this->hasError() || (!$this->data_has_changed && !$force))
		{
			return 0;
		}
		$res = e107::getDb()->db_Update($this->getModelTable(), $this->toSqlQuery('update'));
		if(!$res)
		{
			$this->_db_errno = e107::getDb()->getLastErrorNumber();
			if($this->_db_errno)
			{
				$this->addMessageError('SQL Update Error', $session_messages); //TODO - Lan
				$this->addMessageDebug('SQL Error #'.$this->_db_errno.': '.e107::getDb()->getLastErrorText());
				return false;
			}
			$this->addMessageInfo(LAN_NO_CHANGE);
			return 0;
		}
		$this->addMessageSuccess(LAN_UPDATED);
		return $res;
    }
	
    /**
     * Delete DB data
     * 
     * @param boolean $force force query even if $data_has_changed is false
     * @param boolean $session_messages to use or not session to store system messages
     */
    public function dbDelete($session_messages = false)
    {
    	$this->_db_errno = 0;
		if($this->hasError())
		{
			return 0;
		}
		
		if(!$this->getId())
		{
			$this->addMessageError('Record not found', $session_messages); //TODO - Lan
			return 0;
		}
		$res = e107::getDb()->db_Delete($this->getModelTable(), $this->getFieldIdName().'='.intval($this->getId()));
		if(!$res)
		{
			$this->_db_errno = e107::getDb()->getLastErrorNumber();
			if($this->_db_errno)
			{
				$this->addMessageError('SQL Delete Error', $session_messages); //TODO - Lan
				$this->addMessageDebug('SQL Error #'.$this->_db_errno.': '.e107::getDb()->getLastErrorText());
			}
		}
		
		return $res;
    }
	
	/**
	 * Build query array to be used with db methods (db_Update, db_Insert, db_Replace)
	 * 
	 * @param string $force [optional] force action - possible values are create|update|replace
	 * @return array db query
	 */
	public function toSqlQuery($force = '')
	{
		$qry = array();
		
		if($force)
		{
			$action = $force;
		}
		else
		{
			$action = $this->getId() ? 'update' : 'create';
		}
		
		$qry['_FIELD_TYPES'] = $this->_FIELD_TYPES; //DB field types are optional
		$qry['data'][$this->getFieldIdName()] = $this->getId();
		$qry['_FIELD_TYPES'][$this->getFieldIdName()] = 'int';
		
		foreach ($this->_data_fields as $key => $type)
		{
			if($key == $this->getFieldIdName())
			{
				continue;
			}
			if(!isset($qry['_FIELD_TYPES'][$key]))
			{
				$qry['_FIELD_TYPES'][$key] = $type; //_FIELD_TYPES much more optional now...
			}
			$qry['data'][$key] = $this->getData($key);
		}
		
		switch($action)
		{
			case 'create':
				$qry['data'][$this->getFieldIdName()] = 0;
			break;
			case 'replace':
				$qry['_REPLACE'] = true;
			break;
		
			case 'update':
				unset($qry['data'][$this->getFieldIdName()]);
				$qry['WHERE'] = $this->getFieldIdName().'='.intval($this->getId()); //intval just in case...
			break;
		}
		
		return $qry;
	}
	
	/**
	 * Sanitize value based on its db field type ($_data_fields),
	 * method will return null only if db field rule is not found.
	 * If $value is null, it'll be retrieved from object posted data
	 * If $key is an array, $value is omitted.
	 * 
	 * NOTE: If $key is not found in object's _data_fields array, null is returned
	 * 
	 * @param mixed $key string key name or array data to be sanitized
	 * @param mixed $value 
	 * @return mixed sanitized $value or null on failure
	 */
	public function sanitize($key, $value = null)
	{
		$tp = e107::getParser();
		if(is_array($key))
		{
			$ret = array(); 
			foreach ($key as $k=>$v)
			{
	            if(isset($this->_data_fields[$k]))
	            {
	               $ret[$k] = $this->sanitize($k, $v);
	            }
			}
			return $ret;
		}
		
		if(!isset($this->_data_fields[$key]))
		{
			return null;
		}
		$type =  $this->_data_fields[$key];
		if(null === $value)
		{
			$value = $this->getPostedData($key);
		}
		
		switch ($type)
		{
			case 'int':
			case 'integer':
				return intval($this->toNumber($value));
			break;

			case 'str':
			case 'string':
				return $tp->toDB($value);
			break;

			case 'float': 
				return $this->toNumber($value);
			break;

			case 'bool':
			case 'boolean':
				return ($value ? true : false);
			break;

			case 'model':
				return $value-mergePostedData(false, true, true)->sanitize(); //XXX - ???
			break;
			
			case 'null':
				return ($value ? $tp->toDB($value) : null);
			break;
	  	}
		
		return null;
	}

	public function destroy()
	{
		parent::destroy();
		$this->_validator = null;
		$this->_validation_rules = array();
		$this->_db_errno = null;
		$this->_posted_data = array();
		$this->data_has_changed = array();
		$this->_FIELD_TYPES = array();		
	}
}

/**
 * Model collection handler
 */
class e_tree_model extends e_model 
{
	/**
	 * Current model DB table, used in all db calls
	 * This can/should be overwritten by extending the class
	 * 
	 * @var string
	 */
	protected $_db_table;
	
	/**
	 * All records (no limit) cache
	 * 
	 * @var string
	 */
	protected $_total = 0;
	
	/**
	 * Constructor
	 *
	 */
	function __construct($tree_data = array())
	{
		if($tree_data)
		{
			$this->setTree($tree_data);
		}
	}
	
	public function getTotal()
	{
		return $this->_total; 
	}
	
	public function setTotal($num)
	{
		$this->_total = $num;
		return $this;
	}
	
	/**
	 * Set table name
	 * @param object $table
	 * @return e_admin_tree_model
	 */
	public function setModelTable($table)
	{
		$this->_db_table = $table;
		return $this;
	}
	
	/**
	 * Get table name
	 * @return string
	 */
	public function getModelTable()
	{
		return $this->_db_table;
	}
	
	/**
	 * Set array of models
	 * @return array
	 */
	function getTree($force = false)
	{
		return $this->get('__tree');
	}
	
	/**
	 * Set array of models
	 * @return e_tree_model
	 */
	function setTree($tree_data, $force = false)
	{
		if($force || !$this->is('__tree'))
		{
			$this->set('__tree', $tree_data);
		}

		return $this;
	}
	
	/**
	 * Default load method
	 * 
	 * @return e_tree_model
	 */
	public function load($force = false)
	{
		
		if(!$this->isEmpty() && !$force)
		{
			return $this;
		}
		
		if($this->getParam('db_query') && $this->getParam('model_class') && class_exists($this->getParam('model_class')))
		{
			$sql = e107::getDb();
			$class_name = $this->getParam('model_class');
			$this->_total = $sql->total_results = false;
			if($sql->db_Select_gen($this->getParam('db_query')))
			{
				$this->_total = $sql->total_results; //requires SQL_CALC_FOUND_ROWS in query - see db handler
				
				while($tmp = $sql->db_Fetch())
				{
					$tmp = new $class_name($tmp);
					$this->setNode($tmp->get($this->getFieldIdName()), $tmp);
				}
				// FIXME - test for type of $this->_total to avoid query if table is empty
				if(!$this->_total && $this->getModelTable())
				{
					//SQL_CALC_FOUND_ROWS not found in the query, do one more query
					$this->_total = e107::getDb()->db_Count($this->getModelTable());
				}
				
				unset($tmp);
			}
		}
		return $this;
	}

	/**
	 * Get single model instance from the collection
	 * @param integer $node_id
	 * @return e_model
	 */
	function getNode($node_id)
	{
		return $this->getData('__tree/'.$node_id);
	}
	
	/**
	 * Add or remove (when $node is null) model to the collection
	 * 
	 * @param integer $node_id
	 * @param e_model $node
	 * @return e_tree_model
	 */
	function setNode($node_id, $node)
	{
		if(null === $node)
		{
			$this->removeData('__tree/'.$node_id);
			return $this;
		}
		
		$this->setData('__tree/'.$node_id, $node);
		return $this;
	}
	
	/**
	 * Check if model with passed id exists in the collection
	 * 
	 * @param integer $node_id
	 * @return boolean
	 */
	public function isNode($node_id)
	{
		return $this->isData('__tree/'.$node_id);
	}
	
	/**
	 * Check if model with passed id exists in the collection and is not empty
	 * 
	 * @param integer $node_id
	 * @return boolean
	 */
	public function hasNode($node_id)
	{
		return $this->hasData('__tree/'.$node_id);
	}
	
	/**
	 * Check if collection is empty
	 *
	 * @return boolean
	 */
	function isEmpty()
	{
		return (!$this->has('__tree'));
	}
}

class e_admin_tree_model extends e_tree_model
{
	/**
	 * Delete records
	 * @param mixed $ids
	 * @param boolean $destroy [optional] destroy object instance after db delete
	 * @param boolean $session_messages [optional]
	 * @return mixed integer deleted records or false on DB error
	 */
	public function delete($ids, $destroy = true, $session_messages = false)
	{
		if(!$ids) return $this;
		if(is_array($ids))
		{
			$ids = implode(',', $ids);
		}
		$ids = e107::getParser()->toDB($ids);
		$sql = e107::getDb();
		$res = $sql->db_Delete($this->getModelTable(), $this->getFieldIdName().' IN ('.$ids.')');
		if(!$res)
		{	
			if($sql->getLastErrorNumber())
			{
				$this->addMessageError('SQL Delete Error', $session_messages); //TODO - Lan
				$this->addMessageDebug('SQL Error #'.$sql->getLastErrorNumber().': '.$sql->getLastErrorText());
			}
		}
		elseif($destroy)
		{
			if(!is_array($ids))
			{
				$ids = explode(',', $ids);
			}
			
			foreach ($ids as $id)
			{
				if($this->getNode($id))
				{
					$this->getNode($id)->setMessages(true, $session_messages);
					call_user_func(array($this->getNode(trim($id)), 'destroy')); // first call model destroy method if any
					$this->setNode($id, null);
				}
			}
		}
		
		return $res;
	}
}


// Experimental admin interface class. //TODO integrate with the above. 
// see e107_plugins/release/admin_config.php.  
class e_model_interface
{
	var $fields;
	var $fieldpref;
	var $listQry;
	var $table;
	var $pid;
	var $mode; // as found in the URL query. $_GET['mode]
			
	function __construct()
	{

	}
	
	function init()
	{
		
		global $user_pref; // e107::getConfig('user') ??
		
		$this->mode = varset($_GET['mode']) ? $_GET['mode'] : 'list';
		
		$column_pref_name = "admin_".$this->table."_columns";
				
		if(isset($_POST['submit-e-columns']))
		{		
			$user_pref[$column_pref_name] = $_POST['e-columns'];
			save_prefs('user');
			$this->mode = 'list';
		}
				
		$this->fieldpref = (varset($user_pref[$column_pref_name])) ? $user_pref[$column_pref_name] : array_keys($this->fields);		
		
		foreach($this->fields as $k=>$v) // Find Primary table ID field (before checkboxes is run. ). 
		{
			if(vartrue($v['primary']))
			{
				$this->pid = $k;
			}
		}
		
		
		if(varset($_POST['execute_batch']))
		{
			if(vartrue($_POST['multiselect']))
			{
				// $_SESSION[$this->table."_batch"] = $_POST['execute_batch']; // DO we want this to 'stick'?
				list($tmp,$field,$value) = explode('__',$_POST['execute_batch']);
				$this->processBatch($field,$_POST['multiselect'],$value);
			}
			$this->mode = 'list';	
		}
				
		if(varset($_POST['execute_filter'])) // Filter the db records. 
		{
			$_SESSION[$this->table."_filter"] = $_POST['filter_options'];
			list($tmp,$filterField,$filterValue) = explode('__',$_POST['filter_options']);
			$this->modifyListQry($_POST['searchquery'],$filterField,$filterValue);
			$this->mode = 'list';	
		}
		
			
		if(varset($_POST['update']) || varset($_POST['create']))
		{
		
			$id = intval($_POST['record_id']);
			$this->saveRecord($id);
		}
		
		if(varset($_POST['delete']))
		{
			$id = key($_POST['delete']);
			$this->deleteRecord($id);
			$this->mode = "list";
		}
		
		if(varset($_POST['saveOptions']))
		{
			$this->saveSettings();
		}
		
		if(varset($_POST['edit']))
		{
			$this->mode = 'create';
		}
		
		
		if($this->mode) // Render Page. 
		{
			$method = $this->mode."Page";
			$this->$method();
		}
		
	}


	function modifyListQry($search,$filterField,$filterValue)
	{
		$searchQry = array();
			
			if(vartrue($filterField) && vartrue($filterValue))
			{
				$searchQry[] = $filterField." = '".$filterValue."'";
			}
			
			$filter = array();
			
			foreach($this->fields as $key=>$var)
			{
				if(($var['type'] == 'text' || $var['type'] == 'method') && vartrue($search))
				{
					$filter[] = "(".$key." REGEXP ('".$search."'))";	
				}
			}
			if(count($filter)>0)
			{
				$searchQry[] = " (".implode(" OR ",$filter)." )";
			}
			if(count($searchQry)>0)
			{
				$this->listQry .= " WHERE ".implode(" AND ",$searchQry);
			}
	}


	function processBatch($field,$ids,$value)
	{
		$sql = e107::getDb();
		
		if($field == 'delete')
		{
			return $sql->db_Delete($this->table,$this->pid." IN (".implode(",",$ids).")");	
		}
		
		if(!is_numeric($value))
		{
			$value = "'".$value."'";	
		}
		
		$query = $field." = ".$value." WHERE ".$this->pid." IN (".implode(",",$ids).") ";
		$count = $sql->db_Update($this->table,$query);
	}
	
	function renderFilter()
	{
		$frm = e107::getForm();
		$text = "<form method='post' action='".e_SELF."?".e_QUERY."'>
		<div class='left' style='padding-bottom:10px'>\n"; //TODO assign CSS
		$text .= "<input class='tbox' type='text' name='searchquery' size='20' value=\"".$_POST['searchquery']."\" maxlength='50' />\n";
		$text .= $frm->select_open('filter_options', array('class' => 'tbox select e-filter-options', 'id' => false));
		$text .= $frm->option('Display All', '');	
		$text .= $this->renderBatchFilter('filter');
		
        $text .= $frm->admin_button('execute_filter', ADLAN_142);
		$text .= "</div></form>\n";
		return $text;	
	}
	
	function renderBatch()
	{	
		$frm = e107::getForm();
		
	
		if(!varset($this->fields['checkboxes']))
		{
			return;
		}	
		
		$text = "<div class='buttons-bar left'>
         	<img src='".e_IMAGE_ABS."generic/branchbottom.gif' alt='' class='icon action' />";
			$text .= $frm->select_open('execute_batch', array('class' => 'tbox select e-execute-batch', 'id' => false)).
			$frm->option('With selected...', '').			
			$frm->option(LAN_DELETE, 'batch__delete');
		$text .= $this->renderBatchFilter('batch');	
		$text .= "</div>";
		
		return $text;

	}
	
	function renderBatchFilter($type='batch') // Common function used for both batches and filters. 
	{
		$frm = e107::getForm();
				
		$optdiz 	= array('batch' => 'Modify ', 'filter'=> 'Filter by ');
						
		foreach($this->fields as $key=>$val)
		{
			if(!varset($val[$type]))
			{
				continue;
			}
			
			$option = array();
			
			switch($val['type'])
			{
					case 'boolean': //TODO modify description based on $val['parm]
						$option[$type.'__'.$key."__1"] = LAN_YES;
						$option[$type.'__'.$key."__0"] = LAN_NO;
					break;
					
					case 'dropdown': // use the array $parm; 
						foreach($val['parm'] as $k=>$name)
						{
							$option[$type.'__'.$key."__".$k] = $name;
						}
					break;
					
					case 'date': // use $parm to determine unix-style or YYYY-MM-DD 
					    //TODO last hour, today, yesterday, this-month, last-month etc. 
					/*	foreach($val['parm'] as $k=>$name)
						{
							$text .= $frm->option($name, $type.'__'.$key."__".$k);	
						}*/
					break;
					
					case 'userclass':
						$classes = e107::getUserClass()->uc_required_class_list($val['parm']);
						foreach($classes as $k=>$name)
						{
							$option[$type. '__'.$key."__".$k] = $name;
						}
					break;					
				
					case 'method':
						$method = $key;
						$list = $this->$method('',$type);
						foreach($list as $k=>$name)
						{
							$option[$type.'__'.$key."__".$k] = $name;
						}
					break;
			}
				
				if(count($option)>0)
				{
					$text .= "\t".$frm->optgroup_open($optdiz[$type].$val['title'], $disabled)."\n";
					foreach($option as $okey=>$oval)
					{
						$sel = ($_SESSION[$this->table."_".$type] == $okey) ? TRUE : FALSE;
						$text .= $frm->option($oval, $okey,$sel)."\n";			
					}
					$text .= "\t".$frm->optgroup_close()."\n";	
				}
				
					
		}
			

		$text .= "</select>";
		
		return $text;
		
	}
	
	
	/**
	 * Generic DB Record Listing Function. 
	 * @return 
	 */
	function listPage()
	{
		$ns = e107::getRender();
		$sql = e107::getDb();
		$frm = e107::getForm();
		$mes = e107::getMessage();
		$pref = e107::getConfig()->getPref();
		$tp = e107::getParser();
		
		$amount = 20; // do we hardcode or let the plugin developer decide.. OR - a pref in admin?
		$from = vartrue($_GET['frm']) ? $_GET['frm'] : 0;	//TODO sanitize?. 	
		$text = $this->renderFilter();
        $text .= "<form method='post' action='".e_SELF."'>
                        <fieldset id='core-".$this->table."-list'>
						<legend class='e-hideme'>".$this->pluginTitle."</legend>
						<table cellpadding='0' cellspacing='0' class='adminlist'>".
							$frm->colGroup($this->fields,$this->fieldpref).
							$frm->thead($this->fields,$this->fieldpref, 'mode='.$this->mode.'&fld=[FIELD]&asc=[ASC]&frm=[FROM]').

							"<tbody>";


		if(!$total = $sql->db_Select_gen($this->listQry))
		{
			$text .= "\n<tr><td colspan='".count($this->fields)."' class='center middle'>".LAN_NO_RECORDS."</td></tr>\n";
		}
		else
		{
			$query = $this->listQry;
			$query .= ($_GET['fld'] && $_GET['asc']) ? " ORDER BY ".$_GET['fld']." ".$_GET['asc'] : "";
			$query .= " LIMIT ".$from.",".$amount;
			
			$sql->db_Select_gen($query);
			$row = $sql->db_getList('ALL', FALSE, FALSE);
			
			foreach($row as $field)
			{
				$text .= $frm->trow($this, $field);
			}

		}

		$text .= "
						</tbody>
					</table>";
					
		$text .= $this->renderBatch();
		
		$text .= "
				</fieldset>
			</form>
		";
		
		$parms = $total.",".$amount.",".$from.",".e_SELF.'?action='.$this->mode.'&frm=[FROM]';
    	$text .= $tp->parseTemplate("{NEXTPREV={$parms}}");

		$ns->tablerender($this->pluginTitle." :: ".$this->adminMenu['list']['caption'], $mes->render().$text);
	}
	
	
	/**
	 * Generic DB Record Creation Form. 
	 * @param object $id [optional]
	 * @return 
	 */
	function createPage()
	{
		global $e_userclass, $e_event;
		
		$id = varset($_POST['edit']) ? key($_POST['edit']) : "";

		$tp = e107::getParser();
		$ns = e107::getRender();
		$sql = e107::getDb();
		$frm = e107::getForm();
		

		if($id)
		{
			$query = str_replace("{ID}",$id,$this->editQry);
			$sql->db_Select_gen($query);
			$row = $sql->db_Fetch(MYSQL_ASSOC);			
		}
		else
		{
			$row = array();
		}

		$text = "
			<form method='post' action='".e_SELF."?mode=list' id='dataform' enctype='multipart/form-data'>
				<fieldset id='core-cpage-create-general'>
					<legend class='e-hideme'>".$this->pluginTitle."</legend>
					<table cellpadding='0' cellspacing='0' class='adminedit'>
						<colgroup span='2'>
							<col class='col-label' />
							<col class='col-control' />
						</colgroup>
						<tbody>";
			
		foreach($this->fields as $key=>$att)
		{
			if($att['forced']!==TRUE)
			{
				$text .= "
					<tr>
						<td class='label'>".$att['title']."</td>
						<td class='control'>".$this->renderElement($key,$row)."</td>
					</tr>";
			}
							
		}

		$text .= "
			</tbody>
			</table>	
		<div class='buttons-bar center'>";
					
					if($id)
					{
						$text .= $frm->admin_button('update', LAN_UPDATE, 'update');
						$text .= "<input type='hidden' name='record_id' value='".$id."' />";						
					}	
					else
					{
						$text .= $frm->admin_button('create', LAN_CREATE, 'create');	
					}
					
		$text .= "
			</div>
			</fieldset>
		</form>";	
		
		$ns->tablerender($this->pluginTitle." :: ".$this->adminMenu['create']['caption'], $text);
	}
	
	
	/**
	 * Generic Save DB Record Function. 
	 * @param object $id [optional]
	 * @return 
	 */
	function saveRecord($id=FALSE)
	{
		global $e107cache, $admin_log, $e_event;

		$sql = e107::getDb();
		$tp = e107::getParser();
		$mes = e107::getMessage();
		
		$insert_array = array();
		
		//TODO validation and sanitizing using above classes. 
		
		foreach($this->fields as $key=>$att)
		{
			if($att['forced']!=TRUE)
			{
				$insert_array[$key] = $_POST[$key]; 
			}
		}
			
		if($id)
		{
			$insert_array['WHERE'] = $this->primary." = ".$id;
			$status = $sql->db_Update($this->table,$insert_array) ? E_MESSAGE_SUCCESS : E_MESSAGE_FAILED;
			$message = LAN_UPDATED;	// deliberately ambiguous - to be used on success or error. 

		}
		else
		{
			$status = $sql->db_Insert($this->table,$insert_array) ? E_MESSAGE_SUCCESS : E_MESSAGE_FAILED;
			$message = LAN_CREATED;	
		}
		

		$mes->add($message, $status);		
	}

	/**
	 * Generic Delete DB Record Function. 
	 * @param object $id
	 * @return 
	 */
	function deleteRecord($id)
	{
		if(!$id || !$this->primary || !$this->table)
		{
			return;
		}
		
		$mes = e107::getMessage();
		$sql = e107::getDb();
		
		$query = $this->primary." = ".$id;
		$status = $sql->db_Delete($this->table,$query) ? E_MESSAGE_SUCCESS : E_MESSAGE_FAILED;
		$message = LAN_DELETED; 
		$mes->add($message, $status);	
	}


	/**
	 * Render Form Element (edit page)
	 * @param object $key
	 * @param object $row
	 * @return 
	 */
	function renderElement($key,$row)
	{
		$frm = e107::getForm();
		
		$att = ($this->mode == 'options') ? $this->prefs[$key] : $this->fields[$key];
		$value = $row[$key];	
		
		if($att['type']=='method')
		{
			$meth = $key;
			return $this->$meth($value);
		}
		
		if($att['type']=='boolean')
		{
			return $frm->radio_switch($key, $row[$key]);	
		}
		
		return $frm->text($key, $row[$key], 50);
			
	}


	/**
	 * Render Field value (listing page)
	 * @param object $key
	 * @param object $row
	 * @return 
	 */
	function renderValue($key,$row) // NO LONGER REQUIRED. use $frm->trow();
	{
		$att = $this->fields[$key];	
		//TODO add checkbox. 
				
		if($att['type']=='method')
		{
			$meth = $key;
			return $this->$meth($row[$key]);
		}
				
		
		if($key == "options")
		{
			$id = $this->primary;
	//		$text = "<input type='image' class='action edit' name='edit[{$row[$id]}]' src='".ADMIN_EDIT_ICON_PATH."' title='".LAN_EDIT."' />";
	//		$text .= "<input type='image' class='action delete' name='delete[{$row[$id]}]' src='".ADMIN_DELETE_ICON_PATH."' title='".LAN_DELETE." [ ID: {$row[$id]} ]' />";
	//		return $text;
		}
		
		switch($att['type']) 
		{
			case 'url':
				return "<a href='".$row[$key]."'>".$row[$key]."</a>";
			break;
		
			default:
				return $row[$key];
			break;
		}	
		return $row[$key] .$att['type'];	
	}


	/**
	 * Generic Options/Preferences Form. 
	 * @return 
	 */
	function optionsPage()
	{
		$pref = e107::getConfig()->getPref();
		$frm = e107::getForm();
		$ns = e107::getRender();
		$mes = e107::getMessage();

		//XXX Lan - Options
		$text = "
			<form method='post' action='".e_SELF."?".e_QUERY."'>
				<fieldset id='core-cpage-options'>
					<legend class='e-hideme'>".LAN_OPTIONS."</legend>
					<table cellpadding='0' cellspacing='0' class='adminform'>
						<colgroup span='2'>
							<col class='col-label' />
							<col class='col-control' />
						</colgroup>
						<tbody>\n";
						
						
						foreach($this->prefs as $key => $var)
						{
							$text .= "
							<tr>
								<td class='label'>".$var['title']."</td>
								<td class='control'>
									".$this->renderElement($key,$pref)."
								</td>
							</tr>\n";	
						}
					
						$text .= "</tbody>
					</table>
					<div class='buttons-bar center'>
						".$frm->admin_button('saveOptions', LAN_SAVE, 'submit')."
					</div>
				</fieldset>
			</form>
		";

		$ns->tablerender($this->pluginTitle." :: ".LAN_OPTIONS, $mes->render().$text);
	}


	function saveSettings() //TODO needs to use native e_model functions, validation etc.  
	{
		global $pref, $admin_log;
		
		unset($_POST['saveOptions'],$_POST['e-columns']);
		
		foreach($_POST as $key=>$val)
		{
			e107::getConfig('core')->set($key,$val);
		}
						
		e107::getConfig('core')->save();
	}


	/**
	 * Generic Admin Menu Generator
	 * @param object $action
	 * @return 
	 */
	function show_options()
	{
		
		$action = $this->mode;
		
		foreach($this->adminMenu as $key=>$val)
		{
			$var[$key]['text'] = $val['caption'];
			$var[$key]['link'] = e_SELF."?mode=".$key;
			$var[$key]['perm'] = $val['perm'];	
		}

		e_admin_menu($this->pluginTitle, $action, $var);
	}
	
	
}