added interface for workday and absence + multiday absences closes #38, #39

Backend/models/user.go

@@ -85,6 +85,15 @@ func (u *User) GetAll() ([]User, error) {
 	return users, nil
 }
 
+// Returns the worktime per day rounded to minutes
+func (u *User) ArbeitszeitProTag() time.Duration {
+	return time.Duration(u.ArbeitszeitPerTag * float32(time.Hour)).Round(time.Minute)
+}
+
+func (u *User) ArbeitszeitProWoche() time.Duration {
+	return time.Duration(u.ArbeitszeitPerWoche * float32(time.Hour)).Round(time.Minute)
+}
+
 // Returns true if there is a booking 1 for today -> meaning the user is at work
 // Returns false if there is no booking today or the user is already booked out of the system
 func (u *User) CheckAnwesenheit() bool {