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

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

module.exports.addMark = function(sessionID, username, mark, subject, desc, term, response, callback){

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

    if(response){

      console.log("Ops!")
      callback(null, response);

    }

    if(row){

      var user = utils.rowToString(sessid, "username");

      console.log("SessID found for " + user + "!");

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

        if(classes.length > 1){

          console.log("WTF?");
          response = {

            success: false,
            error: "generic"

          }

          callback(null, response);

        }

        if(classes.length == 1){

          console.log("Classi trovate!");

          var classes = utils.rowToString(classes, "classes");
          var cArr = classes.split(",");

          var getrawClass = "SELECT class FROM users WHERE username = ? AND rank = 'stud'";
          db.query(getrawClass, [username], function(err, classn){

            var rawClass = utils.rowToString(classn, "class");
            console.log(jClass);

            if(err){throw err; response = {success: false, errordesc: "fatal"}}

            if(classn.length == 0){

              console.log("Studente inesistente");
              response = {

                success: false,
                error: "username_does_not_exist"

              }

              callback(null, response);

            }

            if(classn.length == 1){

              if(cArr.contains(rawClass)){

                console.log("Autorizzato!");

                var unixdate = Math.round((new Date()).getTime() / 1000);

                var addMarkQuery = "INSERT INTO global_marks (username, class, mark, subject, description, mark_date, term) VALUES(?,?,?,?,?,?,?)";
                db.query(addMarkQuery, [username, rawClass, mark, subject, desc, unixdate, term], function(err, res){

                  if(err){ throw err; response = { success: false, errordesc: "fatal" } }

                  console.log("Voto aggiunto!");

                  response = {

                    success: true,
                    student: username,
                    class: rawClass,
                    "mark": mark,
                    "subject": subject,
                    description: desc,
                    date: unixdate,
                    term: term

                  }

                  callback(null, response);

                });

              }else{

                console.log("Non autorizzato");
                response = {

                  success: false,
                  error: "Unauthorized"

                }

                callback(null, response);

              }

            }

          });

        }

      });

    }

  });

}

module.exports.getMarks = function(sessionid, student, response, callback){

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

    if(response){

      console.log("Ops!");
      callback(null, response);

    }

    if(row){

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

        console.log(rank, username);

        switch (rank) {
          case 'prof':

          console.log("è un prof!");

          db.query("SELECT class FROM users WHERE username = ?", [student], function(err, row){

            if(row.length == 0){

              console.log("Nessuno studente con quell'username");

              response = {

                success: false,
                errordesc: "no_student_found"

              }

              callback(null, response);

            }

            if(err){

              throw err;
              response = {

                success: false,
                errordesc: "fatal"

              }

              callback(null, response);
              return false;
            }

            if(row.length == 1){

              console.log("Classe dello studente trovata");

              var rawClass = utils.rowToString(row, "class");

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

                if(row.length == 0){

                  console.log("Nessun prof con quell'username");

                  response = {

                    success: false,
                    errordesc: "no_prof_found"

                  }

                  callback(null, response);

                }

                if(err){

                  throw err;
                  response = {

                    success: false,
                    errordesc: "fatal"

                  }

                  callback(null, response);
                  return false;
                }

                if(row.length == 1){

                  var rawClasses = utils.rowToString(row, "classes");
                  var classesArray = rawClasses.split(",");

                  console.log(classesArray);

                  if(classesArray.contains(rawClass)){

                    console.log("Professore autorizzato a leggere i voti dello studente " + student);
                    db.query("SELECT * FROM global_marks WHERE username = ?", [student], function(err, marks){

                      console.log("Query per le info dei voti eseguita!");

                      if(marks.length == 0){

                        if(err) callback(err, null);

                        console.log("Nessun voto.");
                        response = {

                          success: false,
                          error: 'no_marks_found'

                        }

                        callback(null, response);

                      }

                      if(marks.length > 0){

                        console.log("Voto/i trovato/i per " + username);

                        response = {
                          success: true,
                          list: marks
                        }

                        callback(null, response);

                      }

                    });


                  }else{

                    console.log("Professore non autorizzato!");

                    response = {

                      success: false,
                      errordesc: "not_of_this_class"

                    }

                    callback(null, response);

                    return false;

                  }

                }

              });

            }

          });

            break;

          case 'stud':

          console.log("è uno studente!");

          db.query("SELECT * FROM global_marks WHERE username = ?", [student], function(err, marks){

            console.log("Query per le info dei voti eseguita!");

            if(marks.length == 0){

              if(err) callback(err, null);

              console.log("Nessun voto.");
              response = {

                success: false,
                error: 'no_marks_found'

              }

              callback(null, response);

            }

            if(marks.length > 0){

              console.log("Voto/i trovato/i per " + username);

              response = {
                success: true,
                list: marks
              }

              callback(null, response);

            }

          });

          break;

          default:

          break;

        }

      }

  });

}

module.exports.alterMark = function(sessionid, newmark, newdesc, markid, response, callback){

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

    if(err){

      throw err;
      response = {

        success: false,
        error: "fatal"

      }

      callback(null, response);
      return false;

    }

    if(row.length == 0){

      response = {

        success: false,
        error: "invalid_sessionid"

      }
      callback(null, response);

    }

    if(row.length == 1){

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

      db.query("SELECT class FROM global_marks WHERE id = ?", [markid], function(err, row){

        if(err){

          throw err;
          response = {

            success: false,
            error: "fatal"

          }

          callback(null, response);
          return false;

        }

        if(row.length == 0){

          response = {

            success: false,
            error: "no_id_found"

          }

          callback(null, response);

        }

        if(row.length == 1){

          var rawClass = utils.rowToString(row, "class");

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

            if(row.length == 0){

              console.log("Nessun prof con quell'username");

              response = {

                success: false,
                errordesc: "no_prof_found"

              }

              callback(null, response);

            }

            if(err){

              throw err;
              response = {

                success: false,
                errordesc: "fatal"

              }

              callback(null, response);
              return false;
            }

            if(row.length == 1){

              var rawClasses = utils.rowToString(row, "classes");
              var classesArray = rawClasses.split(",");

              if(classesArray.contains(rawClass)){

                console.log("Professore autorizzato a modificare il voto");
                db.query("UPDATE global_marks SET mark = ?, description = ? WHERE id = ?", [newmark, newdesc, markid], function(err, success){

                  if(err){

                    throw err;

                    response = {

                      success: false,
                      errordesc: "fatal"

                    }

                    callback(null, response);
                    return false;

                  }

                  response = {
                    success: true,
                    newmark: newmark,
                    newdesc: newdesc

                  }

                  callback(null, response);

                });

              }else{

                console.log("Professore non autorizzato!");

                response = {

                  success: false,
                  errordesc: "not_of_this_class"

                }

                callback(null, response);

                return false;

              }

            }

          });

        }

      });

    }

  });
}