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

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

module.exports.addTest = function(sessionid, classname, subject, description, date, response, callback){

  utils.checkProfSession(sessionid, function(row, response){

    console.log("Controllando la sessione...");

    if(response){

      console.log("Sessione invalida!");
      callback(null, response);
      console.log(response)
      return false;

    }

    if(row){

      console.log("Sessione valida!");

      var username = utils.rowToString(row, "username");

      utils.checkIfProfInClass(username, classname, function(row, response){

        if(response){

          console.log("Non in questa classe!");
          callback(null, response);

        }

        if(row){

          db.query("INSERT INTO tests (class, subject, description, date) VALUES(?,?,?,?)", [classname, subject, description, date], function(err, success){

            if(err){

              console.log("Errore nell'aggiunta della verifica!");

              throw err;
              response = {

                success: false,
                errordesc: "fatal"

              }

              callback(null, response);

            }

            if(success){

              response = {

                success: true

              }

              callback(null, response);

              console.log("Verifica aggiunta!");

            }

          });

        }

      });

    }

  });

}

module.exports.removeTest = function(sessionid, testid, response, callback){

  utils.checkProfSession(sessionid, function(row, res){

    if(res){

      console.log("Sessione invalida!");
      callback(null, res);
      return false;

    }

    if(row){

      console.log("Sessione valida!");
      db.query("DELETE FROM tests WHERE id = ?", [testid], function(err, success){

        if(err){

          throw err;
          response = {

            success: false,
            errordesc: "fatal"

          }

          callback(null, response);
          return false;

        }

        response = {

          success: true

        }

        callback(null, response);

      });

    }

  });

}

module.exports.alterTest = function(sessionid, classname, testid, description, date, response, callback){

  utils.checkProfSession(sessionid, function(row, response){

    if(response){

      console.log("Sessione invalida!");
      callback(null, response);
      return false;

    }

    if(row){

      var username = utils.rowToString(row, "username");

      utils.checkIfProfInClass(username, classname, function(row, response){

        if(response){

          console.log("Sessione invalida!");
          callback(null, response);
          return false;

        }

        if(row){

          db.query("UPDATE tests SET description = ?,date = ? WHERE id = ?", [description, date, testid], function(err, success){

            if(err){

              throw err;
              response = {

                success: false,
                errordesc: "fatal"

              }

              callback(null, response);
              return false;

            }

            console.log("Ok, aggiornato!");

            response = {

              success: true,
              newdesc: description,
              newdate: date

            }

            callback(null, response);

          });

        }

      });

    }

  });

}

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

  utils.checkSession(sessionid, function(row, response){

    if(response){

      console.log("Sessione invalida!");
      callback(null, response);
      return false;

    }

    if(row){
      console.log("Creazione rank ed username");
      var rank = utils.rowToString(row, "rank");
      var username = utils.rowToString(row, "username");
      console.log("r/u creati! \n", rank, username);

      switch(rank){

        case "prof":
        console.log("è un prof!");
        utils.checkIfProfInClass(username, classname, function(row, response){

          if(response){

            console.log("Non di questa classe");
            callback(null, response);
            return false;

          }

          if(row){

            db.query("SELECT * FROM tests WHERE class = ?", [classname], function(err, rows){

              if(err){

                throw err;
                response = {

                  success: false,
                  errordesc: "fatal"

                }

                callback(null, response);

                return false;

              }

            if(rows.length > 0){

              console.log("Verifiche trovate!");

              response = {

                success: true,
                list: rows

              }

              callback(null, response);

            }

            if(rows.length == 0){

              response = {

                success: false,
                errordesc: "no_tests_found"

              }

              callback(null, response);
              return false;

            }

            });

          }

        });

        break;

        case "stud":
        console.log("è uno studente!");
        db.query("SELECT * FROM tests WHERE class = ?", [classname], function(err, rows){

          if(err){

            throw err;
            response = {

              success: false,
              errordesc: "fatal"

            }

            callback(null, response);

            return false;

          }

        if(rows.length > 0){

          console.log("Verifiche trovate!");

          response = {

            success: true,
            list: rows

          }

          callback(null, response);

        }

        if(rows.length == 0){

          response = {

            success: false,
            errordesc: "no_tests_found"

          }

          callback(null, response);
          return false;

        }

        });

        break;

        default:
        break;

      }

    }

  });

}