<?php
/**
 * Changes the order of the grid rows.
 * Should be added to a Grid; column of type 'order' should also be defined
 * 
 * Created on 15.06.2006 by *Camper* (hide@address.com)
 */
class RecordOrder extends AbstractController{
	/**
	 * Field name by which the dataset will be ordered.
	 * By default this field value should by equal to id value. 
	 * You should take care of this by yourself
	 */
	private $field;
	
	function init(){
		parent::init();
		$this->api->addHook('post-init', array($this, 'process'));
	}
	function process(){
		if(isset($_GET[$this->name]))$this->act($_GET[$this->name], $_GET['action']);
	}
	function setField($field_name){
		/**
		 * Sets the field by which dataset will be ordered
		 */
		$this->field=$field_name;
		$this->owner->dq->order("coalesce($this->field, id)");
	}
	function getCell($id){
		if($this->recall('hl',null)){
			$left_pic='amodules3/templates/shared/move-here.gif';
			$left_act=$id==$this->recall('hl',null)?
				"":
				$this->add('Ajax')->reloadRegion('Content', array($this->name=>$id, 'action'=>'mv'))->getString();
			$left_alt="Move marked row here";
			$right_pic='amodules3/templates/shared/xchg.gif';
			$right_act=$id==$this->recall('hl',null)?
				"":
				$this->add('Ajax')->reloadRegion('Content', array($this->name=>$id, 'action'=>'xchg'))->getString();
			$right_alt="Exchange this row with marked";
		}else{
			$left_pic='amodules3/templates/shared/move-up.gif';
			$left_act=
				$this->add('Ajax')->reloadRegion('Content', array($this->name=>$id, 'action'=>'up'))->getString();
			$left_alt="Move this row up once";
			$right_pic='amodules3/templates/shared/move-down.gif';
			$right_act=
				$this->add('Ajax')->reloadRegion('Content', array($this->name=>$id, 'action'=>'dn'))->getString();
			$right_alt="Move this row down once";
		}
		$mark_pic=$id==$this->recall('hl',null)?'amodules3/templates/shared/unmark.gif':'amodules3/templates/shared/mark.gif';
		$mark_act=$this->recall('hl',null)?
			$this->add('Ajax')->reloadRegion('Content', array($this->name=>$id, 'action'=>'untag'))->getString():
			$this->add('Ajax')->reloadRegion('Content', array($this->name=>$id, 'action'=>'tag'))->getString();
		$mark_alt=$this->recall('hl',null)?"Unmark this row":"Mark this row";
		$cell=
			'<img title="'.$left_alt.'" src="'.$left_pic.'" onclick="'.$left_act.'">' .
			'<img title="'.$mark_alt.'" src="'.$mark_pic.'" onclick="'.$mark_act.'">' .
			'<img title="'.$right_alt.'" src="'.$right_pic.'" onclick="'.$right_act.'">'
			;
		//Ajax:ajaxFunc() adds a \n to the end of function, that causes a problem with inlines
		$cell=implode('', explode("\n", $cell));
		return $cell; 
	}
	function act($id, $action){
		$aid=array();
		$ord=array();
		switch($action){
			case 'up':
				$aid[0]=$id;
				$ord[0]=$this->api->db->getOne("select coalesce($this->field,id) from ".$this->owner->dq->args['table'].
					" where id=$id");
				$row=$this->api->db->getHash("select id, coalesce($this->field,id) ord from ".$this->owner->dq->args['table'].
					" where coalesce($this->field,id)<{$ord[0]} order by coalesce($this->field,id) desc limit 1");
				$aid[1]=$row['id']; $ord[1]=$row['ord'];
				break;
			case 'dn':
				$aid[0]=$id;
				$ord[0]=$this->api->db->getOne("select coalesce($this->field,id) from ".$this->owner->dq->args['table'].
					" where id=$id");
				$row=$this->api->db->getHash("select id, coalesce($this->field,id) ord from ".$this->owner->dq->args['table'].
					" where coalesce($this->field,id)>{$ord[0]} order by coalesce($this->field,id) asc limit 1");
				$aid[1]=$row['id']; $ord[1]=$row['ord'];
				break;
			case 'mv':
				$aid[0]=$this->recall('hl');
				$ord[0]=$this->api->db->getOne("select coalesce($this->field,id) from ".$this->owner->dq->args['table'].
					" where id={$aid[0]}");
				$row=$this->api->db->getHash("select id, coalesce($this->field,id) ord from ".$this->owner->dq->args['table'].
					" where id=$id");
				$aid[1]=$row['id']; $ord[1]=$row['ord'];
				$ord[1]+=$ord[0]-$ord[1]>0?-1:1;
				$inc=$ord[0]-$ord[1]>0?"-1":"+1";
				$cond=$ord[0]-$ord[1]>0?"<=":">=";
				$this->api->db->query("update ".$this->owner->dq->args['table']." set " .
						"$this->field=$this->field $inc where coalesce($this->field,id) $cond ".$ord[1]);
				break;
			case 'xchg':
				$aid[0]=$this->recall('hl');
				$ord[0]=$this->api->db->getOne("select coalesce($this->field,id) from ".$this->owner->dq->args['table'].
					" where id={$aid[0]}");
				$row=$this->api->db->getHash("select id, coalesce($this->field,id) ord from ".$this->owner->dq->args['table'].
					" where id=$id");
				$aid[1]=$row['id']; $ord[1]=$row['ord'];
				break;
			case 'tag':
				$this->memorize('hl', $id);
				break;
			case 'untag':
				$this->forget('hl');
				break;
			default:
		}
		//if second pair is null - it is probably the edge of a grid, so we exit
		if(!$ord[1]||!$aid[1])return;
		if($action!='tag'&&$action!='untag'){
			//changing marked/ordered row
			$this->api->db->query("update ".$this->owner->dq->args['table']." set $this->field={$ord[1]} where id={$aid[0]}");
			//changing exchanged row
			if($action!='mv'){
				$this->api->db->query("update ".$this->owner->dq->args['table']." set $this->field={$ord[0]} where id={$aid[1]}");
			}
			$this->forget('hl');
		}
	}
}