.pragma library
.import QtQuick.LocalStorage 2.0 as Sql

function friendicaRequest(login,api,rootwindow,callback) {
        var xhrequest= new XMLHttpRequest();
        xhrequest.onreadystatechange = function() {
            if (xhrequest.readyState === XMLHttpRequest.HEADERS_RECEIVED) {
            } else if(xhrequest.readyState === XMLHttpRequest.DONE) {
                try{ if (xhrequest.responseText!=""){
                        callback(xhrequest.responseText)
                        }else{
                        showMessage("Error",api+" NO RESPONSE",rootwindow)
          callback(xhrequest.responseText)
                    }
              }
               catch (e){
                     showMessage("Error", api+" "+e,rootwindow)
}
            }
        }
        xhrequest.open("GET", login.server+api,true,login.username,Qt.atob(login.password));
        xhrequest.send();
    }


function friendicaWebRequest(url,rootwindow,callback) {
        var xhrequest = new XMLHttpRequest();
        xhrequest.onreadystatechange = function() {
            if (xhrequest.readyState === XMLHttpRequest.HEADERS_RECEIVED) {
            } else if(xhrequest.readyState === XMLHttpRequest.DONE) {
                try{ callback(xhrequest.responseText);
              }
               catch (e){
                 showMessage("Error",url+" "+e, rootwindow)
               }
            }
        }
        xhrequest.open("GET", url,true);
        xhrequest.send();
    }

function readData(database,table,callback,filter,filtervalue) { // reads and applies data from DB
 if (filter){
 var where = " WHERE "+ filter +" = '" + filtervalue+"'";
 } else { var where="";}
 var db=Sql.LocalStorage.openDatabaseSync(database[0],database[1],database[2],database[3]);
 if(!db) { return; }
 db.transaction( function(tx) {
//     print('select * from '+table+where);
        var rsArray=[];
     var rs = tx.executeSql('select * from '+table+where);
     for(var i = 0; i < rs.rows.length; i++) {
         rsArray.push(rs.rows.item(i))
     }
     callback(rsArray);
 });
}

function readField(field,database,table, username, callback,filter,filtervalue) { // reads and applies data from DB
if (filter){
var where = " AND "+ filter +" = '" + filtervalue+"'";
} else { var where="";}
 var db=Sql.LocalStorage.openDatabaseSync(database[0],database[1],database[2],database[3]);
  if(!db) { return; }
 db.transaction( function(tx) {
//     print('... read from database ' + field)
     var rsArray=[];
     print('select DISTINCT '+field+' from '+table+' WHERE username="'+username+'"'+where+' ORDER BY '+field+' ASC');
     var rs = tx.executeSql('select DISTINCT '+field+' from '+table+' WHERE username="'+username+'"'+where+' ORDER BY '+field+' ASC');
     for(var i = 0; i < rs.rows.length; i++) {
         rsArray.push(rs.rows.item(i)[field])
     }
     callback(rsArray);
 });
}

function showMessage(header,message,rootwindow){
    var messageString='import QtQuick 2.0; import QtQuick.Dialogs 1.2; MessageDialog{ visible: true; title:"'+header+'";standardButtons: StandardButton.Ok; text:" '+message+'"}';
    var messageObject=Qt.createQmlObject(messageString,rootwindow,"messageOutput");
}