<?php

/**
 * Class Management accomodate database manipulation; show, remove, edit, and add
 *
 * derived class should redefine protected method with parent::method. it's more php specific.
 * should be fine 
 *
 */

Abstract Class Management extends ControllerBase{

	protected $offset;
	protected $pglimit;

	protected function __construct(){
		parent::__construct();
	}
	public function index(){
		$this->session->set('last',$this->getName().'/index');	
		$this->session->set('lastadmin',$this->getName().'/index');	
		$this->xml->addText($this->getTitle(),'title',0);
		$this->xml->addText(null,'panel',0);
		$this->xml->removeAllLoop();
		$this->xml->buildSubMenu($this->navigator->getSubMenu($this));
		$this->show();
	}
	protected function show(){
		//put the common step here, leave the special case in child class
		$this->offset = 0;	  
		if(isset($_POST['ofs'])){
			$this->offset = $_POST['ofs'];	 
		}	 
		$this->pglimit = PAGELIMIT;
		if(isset($_POST['pglimit'])){
			$this->pglimit = $_POST['pglimit'];	  
		}	 
		//special handling for different children wrapped in a method
		$this->populateShowContent();
		$this->xml->printOffset($this->offset,$this->getTotal(),$this->getName().'/show',$this->pglimit);

		$this->xml->flush();
	}
	
	//remove item
	protected function remove(){
		$this->xml->addText(null,'panel',0);
		if(isset($_POST['id'])){
			$this->offset = $_POST['ofs'];
			$itemnumber = $_POST['itemnumber'];
			if($itemnumber%PAGELIMIT==1){
				if($itemnumber==$this->getTotal()){	  
					$this->offset = $this->offset-PAGELIMIT;
				}
				if($this->offset<0){
					$this->offset = 0;
				}
			}
			$this->removeItem();	 
			$this->xml->addRedirPOST($this->getName().'/show','ofs='.$this->offset);
			$this->xml->addText('Removing item','note',0);
			$this->xml->flush();
		}
	}

	//add item
	public function add(){
		$this->session->set('lastadmin',$this->getName().'/add');	
		//get POST variable
		if(isset($_POST[$this->getKeyVar()])){
			$this->checkAdd();
			//specific for children
			$this->addItem();
			$total = $this->getTotal();
			$this->offset = (floor($total/PAGELIMIT))*PAGELIMIT;
			if($total%PAGELIMIT==0){
				$this->offset -= PAGELIMIT;
			}
			if($this->offset<0){
					$this->offset = 0;
			}
			$this->postAddAction();
			$this->xml->addRedirPOST($this->getName().'/show','ofs='.$this->offset);
			$this->xml->clearForm();
		}
		else{
			$this->xml->addForm($this->getAddID(),$this->getFormPlace(),0);
			$this->populateAddForm();
			$this->xml->addSubmitBtn('submitForm(\''.$this->getName().'/add\')','Submit');
			$this->setAddCaption();
		}
		$this->xml->flush();
	}

	//edit item
	public function edit(){
		if(isset($_POST[$this->getKeyVar()])){
		  	if($_POST[$this->getKeyVar()]==''){
				die('ERROR: Field should not be empty');	  
			}
			$this->checkEdit();
			if($this->editItem()){	  
				$this->postEditAction();
				$this->xml->addRedirPOST($this->getName().'/show','ofs='.$_POST['ofs']);
				$this->offset = $_POST['ofs'];
				$this->xml->addText(null,'panel',0);
			}else{
				$this->xml->addText('IGNORE: item does not exist','note',0);
				$this->xml->addRedirPOST($this->getName().'/show','ofs='.$_POST['ofs']);
			}
		}
		else
		if(isset($_POST['id'])){
			$this->xml->addForm($this->getEditID(),$this->getFormPlace(),0);
			$this->setEditCaption();
			$this->xml->addHidden('id',$_POST['id']);
			$this->offset = $_POST['ofs'];
			$this->xml->addHidden('ofs',$this->offset);
			$this->populateEditForm();  
			$this->xml->addSubmitBtn('submitForm(\''.$this->getName().'/edit\')','Update');
		}
		$this->xml->flush();
	}

	//return the form Edit ID
	protected function getEditID(){
		$result='javascript:sndReqPOST(\''.$this->getName().'/edit\',\'id='.$_POST['id'].'&itemnumber='.$_POST['itemnumber'].'&ofs='.$_POST['ofs'].'\')';
		return $result;
	}

	//return the form Add ID
	protected function getAddID(){
		$result= 'javascript:sndReq(\''.$this->getName().'/add\')';
		return $result;	  
	}

	//populate content that should be displayed including table and url offset if exists
	//return void
	abstract function populateShowContent();

	//build add form
	abstract function populateAddForm();

	//page title
	abstract function getTitle();
	
	//get total item
	abstract function getTotal();

	//add item
	abstract function addItem();

	//edit item
	abstract function editItem();

	//remove item
	abstract function removeItem();

	//set form location
	abstract function getFormPlace();

	//get key variable to add or update
	//it will check for existing post variable with this value
	abstract function getKeyVar();

	abstract function checkAdd();
	abstract function checkEdit();

	//do a favor for the methods below. override on derived class when needed
	//this is the default ones
	protected function postAddAction(){
		$this->xml->addText('Adding new item','note',0);
	}
	protected function postEditAction(){
		$this->xml->addText('Updating item','note',0);
	}
	protected function setEditCaption(){
		$this->xml->addText('Edit Item','headbox',1);
	}
	protected function setAddCaption(){
		$this->xml->addText('Add Item','headbox',1);
	}
}
?>