/* Copyright © 2016 Stefano Pigozzi, Emiliano Maccaferri
 * Released under the GPL v3 license
 */

var db = require("./connection");

module.exports.flushSession = function(sessionid){

    console.log("Pulizia sessione " + sessionid);

    //Un po' più lento di truncate, ma vabbeh... Tanto è async ;)

    db.query("DELETE FROM sessions WHERE session_id = ?", [sessionid], function(err, success){

      if(err) throw err;

      console.log("Sessione " + sessionid + " cancellata!");

    });

}

module.exports.getClass = function(classname, response, callback){

  db.query("SELECT username, firstname, lastname, class FROM users WHERE class = ?", [classname], function(err, rows){

    if(rows.length == 0){

      console.log("Nessuna classe trovata!");

      response = {

        success: false,
        error: "class_not_found"

      }

      callback(null, response);

    }

    if(err){

      console.log("Errore fatale!");

      response = {

        success: false,
        error: "fatal"

      }

      callback(err, response);
      throw err;

    }

    response = {

      success: true,
      list: rows

    }

    callback(null, response);

  });

}

module.exports.getProfClasses = function(username, response, callback){

  db.query("SELECT classes FROM prof_classes WHERE username = ?", [username], function(err, row){

    if(row.length == 0){

      console.log("Nessuna classe trovata!");

      response = {

        success: false,
        errordesc: 'no_classes_found'

      }

      callback(null, response);

    }

      if(row.length == 1){

        var jRow = JSON.stringify(row);
        var parsed = JSON.parse(jRow);
        var classes = parsed[0].classes;
        var classesArray = classes.split(",");

        console.log(classesArray);

        response = {

          success: true,
          username: username,
          classes: classesArray

        }

        callback(null, response);

      }

      if(err){

        throw err;
        response = {

          sucess: false,
          errordesc: 'fatal'

        }

        callback(err, response);

      }

  });

}

module.exports.checkSession = function(sessionid, callback){

  var error;

  if(!sessionid || sessionid == ""){

    error = new Error("Sessionid mancante!");
    return false;

  }

  db.query("SELECT username,rank FROM sessions WHERE session_id = ?", [sessionid], function(queryError, row){

    if(queryError){

      throw queryError;

      response = {

        success: false,
        errordesc: "fatal"

      }

      callback(null, response);
      return false;

    }

    if(row.length == 0){

      response = {

        success: false,
        errordesc: "invalid_sessionid"

      }

      callback(null, response);

    }

    if(row.length == 1){

      callback(row, null);

    }

  });

}

module.exports.checkProfSession = function(sessionid, callback){

  var error;

  if(!sessionid || sessionid == ""){

    error = new Error("Sessionid mancante!");
    return false;

  }

  db.query("SELECT username FROM sessions WHERE session_id = ? AND rank = 'prof'", [sessionid], function(queryError, row){

    console.log(row);

    if(queryError){

      throw queryError;

      response = {

        success: false,
        errordesc: "fatal"

      }

      callback(null, response);
      return false;

    }

    if(row.length == 0){

      response = {

        success: false,
        errordesc: "invalid_sessionid"

      }

      callback(null, response);

    }

    if(row.length == 1){

      callback(row, null);

    }

  });

}

module.exports.checkIfProfInClass = function(username, classname, callback){

  db.query("SELECT classes FROM prof_classes WHERE username = ?", [username], function(err, row){

    if(err){

      throw err;
      response = {

        success: false,
        errordesc: "fatal"

      }

      callback(null, response);

    }

    if(row.length == 0){

      response = {

        success: false,
        errordesc: "no_prof_found"

      }

      callback(null, response);

    }

    if(row.length == 1){

      var cArray = module.exports.rowToString(row, "classes");
      var classes = cArray.split(",");
      if(classes.contains(classname)){

        console.log("Professore autorizzato!");
        callback(row, null);
        console.log("OK!");
        return true;

      }

      response = {

        success: false,
        errordesc: "not_of_this_class"

      }

      callback(null, response);

      return false;

    }

  });

}

module.exports.rowToString = function(row, value){

  var jsonObject = JSON.stringify(row);
  var parsedObj = JSON.parse(jsonObject);

  return parsedObj[0][value];

}

Array.prototype.contains = function ( needle ) {
   for (i in this) {
       if (this[i] == needle) return true;
   }
   return false;
}