<?php

class Doc extends PhpObject {

	const DOC_FOLDER = 'files/';
	const DOC_TABLE = 'docs';
	/**
	 * DB
	 * @var Db
	 */
	private $oDb;
	
	private $iDocId;
	private $iUserId;
	private $iCourseId;
	
	public function __construct(Db &$oDb, $iUserId=0, $iCourseId=0)
	{
		parent::__construct(__CLASS__, Settings::DEBUG);
		$this->oDb = &$oDb;
		$this->setDocId(0);
		$this->setUserCourseId($iUserId, $iCourseId);
	}
	
	public function setDocId($iDocId) {
		$this->iDocId = $iDocId;
	}
	
	public function setUserCourseId($iUserId, $iCourseId) {
		$this->iUserId = $iUserId;
		$this->iCourseId = $iCourseId;
	}
	
	public function exists($sFileName) {
		return file_exists(self::DOC_FOLDER.$sFileName);
	}
	
	public function add($sFileName, $sMimeType) {
		$sType = '';
		switch(mime_content_type(self::getFilePath($sFileName))) {
			case 'application/msword':
			case 'application/vnd.openxmlformats-officedocument.wordprocessingml.document':	$sType = 'word';	break;
			case 'application/pdf': 														$sType = 'pdf';		break;
			case 'audio/mpeg': 																$sType = 'audio';	break;
			case 'image/gif':																$sType = 'image';	break;
			case 'image/jpeg':																$sType = 'image';	break;
			case 'image/png':																$sType = 'image';	break;
		}
		
		$asData = array_merge($this->getDocKeys(), array('filename'=>$sFileName, 'type'=>$sType));
		
		$bResult = $this->oDb->insertRow(self::DOC_TABLE, $asData);
		return $bResult?'':'error_db';
	}
	
	public function delete() {
		if($this->iDocId > 0) {
			$asDoc = $this->getDoc();
			$bResult = $this->oDb->deleteRow(self::DOC_TABLE, $this->iDocId);
			if($bResult) $bResult = unlink($asDoc['filepath']);
		}
		
		return $bResult;
	}
	
	public function getDoc() {
		$asDocList = $this->getList(array(Db::getId(self::DOC_TABLE) => $this->iDocId));
		return array_shift($asDocList);
	}
	
	public function getList($asConstraint=array()) {
		$asKeys = empty($asConstraint)?$this->getDocKeys():$asConstraint;
		$asDocs = $this->oDb->selectRows(array('select'=>array(Db::getId(self::DOC_TABLE), 'type', 'filename'), 'from'=>self::DOC_TABLE, 'constraint'=>$asKeys));
		foreach($asDocs as &$asDoc) $asDoc['filepath'] = self::getFilePath($asDoc['filename']);
		
		return $asDocs;
	}
	
	private function getDocKeys() {
		return array(Db::getId(Auth::USER_TABLE) => $this->iUserId, Db::getId(Course::COURSE_TABLE) => $this->iCourseId);
	}
	
	private static function getFilePath($sFileName) {
		return self::DOC_FOLDER.$sFileName;
	}
}