class db {
    public static $dsn;
    public static $username;
    public static $password;
    public static $db;
    public static $conn;

    public static $arrConnAttr;//Array of connection attributes. Ex: ["PDO::ATTR_ERRMODE", "PDO::ERRMODE_EXCEPTION"]
    public static $pathErroLog;//Path to save the erro log files. Ex:$_SERVER['DOCUMENT_ROOT'] . "/myDirRootProject/LogError"
    public static $arrCatchConnResult;//Path to save the erro log files. Ex:$_SERVER['DOCUMENT_ROOT'] . "/myDirRootProject/LogError"
    public static $die;//If we set $setValues["die"]=NULL, during the object initialization, errors will not stop the process.

    public static $sql;

    private static function init(array $setValues=NULL) {


         $arrInitDefault["dsn"]="localhost";
         $arrInitDefault["username"]= "root";
         $arrInitDefault["password"]="";
         $arrInitDefault["db"]="drset2014";



         $arrInitDefault["arrConnAttr"]= ["PDO::ATTR_ERRMODE"," PDO::ERRMODE_EXCEPTION"];

         $arrInitDefault["pathErroLog"]= dirname(__FILE__)."/Log/Error";//Default path to dir. Note: error pathLog can be "/Log/Error/UserName" or "/Log/Error/UserId", etc
         $arrInitDefault["die"]=  TRUE;

         $arrInitDefault["sql"]=  FALSE;


         if(!is_null($setValues)){
              $arrInitDefault=  array_merge($arrInitDefault,$setValues);
          }

          //After merge, initialaze private variables with result merged $arrValues

          self::$dsn = $arrInitDefault["dsn"];
          self::$username= $arrInitDefault["username"];
          self::$password= $arrInitDefault["password"];
          self::$db= $arrInitDefault["db"];

          self::$arrConnAttr= implode(",", $arrInitDefault["arrConnAttr"]);
          self::$pathErroLog=$arrInitDefault["pathErroLog"];
          self::$die=$arrInitDefault["die"];
         //This try and catch  is only to estabilish the connection during the initialization
         try {

                $dns=self::$dsn;
                $username=self::$username;
                $password=self::$password;
                $db=self::$db;

                self::$conn= new PDO("mysql:host=$dns; dbname=$db", "$username", "$password");//Now private $conn is a PDO object
                self::$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

         }// End of try
         catch(PDOException $e){//If had some error. The PDO object ($this->conn) could not be created. Throw an error.
          self::$arrCatchConnResult = self::saveLogError($e->getMessage());//Save a message in the log file and throw a message
          $msg=self::$arrCatchConnResult["strToHTML"];
          self::$conn=null;
                 if(self::$die){
                       die($msg);
                 }
           }
    }

    public static function saveLogError($msg=NULL,$sql=NULL) {

      $sqlErrorStringHTML="";

       $year = date("Y");
       $month = date("M");
       $day = date("d");
       $dt = date("d.M.Y_H.i.s");

       $pathErroLog=  self::$pathErroLog."/".$year."/".$month."/".$day."/";
       if (!is_dir($pathErroLog)) {
          mkdir($pathErroLog,0777,true);
       }//If is not a dir, create it.

       $sqlErrorStringTXT="";
       $sqlErrorString="";
       if(!is_null($sql)){
        $sqlErrorStringTXT = "Sql: $sql";
        $sqlErrorStringHTML = "<kbd>Sql</kbd>: $sql";
       }

///////////////  Maybe should be good save errors in database too.

$strToTxt=<<<EOF
>>>>>  Mensagem de erro:  <<<<< \n
Date:     $dt \n
Msg:     $msg \n
$sqlErrorStringTXT \n
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
EOF;

//Save error message to the file
$f=$pathErroLog."$dt.txt";
$myfile = fopen($f, "w") or die("Unable to open file!");
fwrite($myfile, $strToTxt);
fclose($myfile);

//Create a string to be displayed in the broser
$strToHTML=<<<EOF
<div class="alert alert-danger" role="alert">
Date:     $dt <br/>
Msg:     <span class="label label-danger">$msg</span><br/>
$sqlErrorStringHTML<br/>
</div>
EOF;

$arrCatchConnResult["status"]=0;
$arrCatchConnResult["strToTxt"]=$strToTxt;
$arrCatchConnResult["strToHTML"]=$strToHTML;

return $arrCatchConnResult;

}//End of saveLogError()

    public static function get_values(array $setValues=NULL) {
              try {
                     self::init($setValues);
                     $stmt = self::$conn->prepare(self::$sql);
                     $stmt->execute();
                     while ($field = $stmt->fetch(PDO::FETCH_ASSOC)) {
                      $arrResult[]=$field;
                    }
                    return $arrResult;
              }
              catch (PDOException $e) {
                    self::$arrCatchConnResult =  self::saveLogError($e->getMessage(),  self::$sql);//Save a message in the log file and set a message
                    $msg= self::$arrCatchConnResult["strToHTML"];
                    self::$conn = null;
                    if(self::$die){
                          die($msg);
                    }
              }
         }


}//End of class db