<?php
/*
Author: 		Riccardo Di Dato
Creation Date:	22/dic/2015
*/

class GenericDao{
	private $mongoObj;
	private $database;
	
	/**
	 * La connection string viene passata interamente a MongoClient, richiede formato 'mongo://server:port'.
	 * host1 e database sono obbligatori 
	 * 
	 * @param string $connectionString 
	 */
	public function __construct($dbName, $connectionString = null){
		if (is_null($connectionString)){
			$this->mongoObj = new MongoClient();
		}
		else {
			if (!preg_match("~^mongo[:][/][/]\w+[:]\w+$~",$connectionString)){
				throw new CoreException("Invalid connectionString parameter passed to 'GenericDao::__construct()' ('".print_r($connectionString,true)."')");
			}
			$this->mongoObj = new MongoClient($connectionString);
		}
		
		$this->database = $this->mongoObj->$dbName;
	}

	/**
	 * Ritorna un array di model
	 * @param string $modelClass classe da ritornare (DaoSaveable)
	 * @param array $filter array associativo della select formato mongo
	 * @param array $options (al momento supporta limit e sort)
	 * @param string $customReturnClass
	 * @throws CoreException se la CustomReturnClass non è valida
	 * @return DaoSaveable[]
	 */
	public function query($modelClass, array $filter = array(), array $options = array()){
		if (!is_null($modelClass)){
			if (!is_subclass_of($modelClass, "DaoSaveable", true)){
				throw new CoreException("Invalid return class passed to GenericDao::query ($modelClass)");
			}
		}
		
		$collectionName = $modelClass::getCollectionName();
		$collection = $this->database->$collectionName;
		
		$useFilter = $filter;
		
		if (!array_key_exists("deleted",$useFilter)){
			$useFilter["deleted"] = false;
		}
		
		if (array_key_exists("id",$useFilter)){
			$useFilter["_id"] = $useFilter["id"];
			unset($useFilter["id"]);
		}
		
		if (array_key_exists("_id",$useFilter) && is_string($useFilter["_id"])){
			$useFilter["_id"] = new MongoId($useFilter["_id"]);
		}
		
		$cursor = $collection->find($useFilter);
		
		if (array_key_exists("sort",$options)){
			$cursor->sort($options["sort"]);
		}
		if (array_key_exists("limit",$options)){
			$cursor->limit($options["limit"]);
		}
		
		$rval = array();
		foreach ($cursor as $element){
			$rval[] = $modelClass::buildFromSaveableObj($element);
		}
		
		return $rval;
	}
	
	/**
	 * Come query ma ritorna il primo o null se non ci sono risultati
	 * @param string $modelClass
	 * @param array $filter
	 * @param array $options
	 * @return DaoSaveable
	 */
	public function getFirst($modelClass, array $filter = array(), array $options = array()){
		$rval = $this->query($modelClass,$filter,$options);
		if (sizeof($rval)>0){
			$rval = reset($rval);
		}
		else {
			$rval = null;
		}
		return $rval;
	}

	/**
	 * Salva...
	 * @param DaoSaveable $model
	 */
	public function save(DaoSaveable $model){
		$collectionName = $model->getCollectionName();
		$collection = $this->database->$collectionName;
		
		$saveObj = $model->getSaveableObj();
		
		if ( array_key_exists("_id", $saveObj) && !is_null($saveObj["_id"]) ){
			$collection->update( array("_id"=>$saveObj["_id"] ), $saveObj );
		}
		else {
			$saveObj["_id"] = new MongoId();
			$collection->insert($saveObj);
			$model->updateFromSaveableObj($saveObj);
		}
	}

	/**
	 * Cancella... la cancellazione non è reale, viene solo settato il campo deleted a true.
	 * @param DaoSaveable $model
	 */
	public function delete(DaoSaveable $model){
		$collectionName = $model->getCollectionName();
		$collection = $this->database->$collectionName;
		
		$saveObj = $model->getSaveableObj();
		
		if ( array_key_exists("_id", $saveObj) && !is_null($saveObj["_id"]) ){
			$saveObj["deleted"] = true;
			$collection->update( array("_id"=>$saveObj["_id"] ), $saveObj );
			$model->updateFromSaveableObj($saveObj);
		}
	}
	
	
	
// 	public static function registerModel($model){
// 		if(is_subclass_of($model, "DaoSaveable",true)){
// 			$collectionName = $model::getCollectionName();
// 			self::$MODEL_REGISTRY[$collectionName] = $model;
	
// 		}
// 		else{
// 			throw new CoreException("Invalid model passed to GenericDao::registerModel ($model)");
// 		}
// 	}
}

?>