#------------------------------------------------------------------------------
#  person.py
#  Definition of the Person, class and related subclasses.
#------------------------------------------------------------------------------
import random

# Global random number generator for generating id numbers.
# Using a seed causes the same random numbers on every run.
rng = random.Random(8723) 
                          

class Person(object):
   """Class representing a person."""

   def __init__(self, s='No Name'):
      """Initialize a Person object.""" 
      if not isinstance(s, str):
         msg = f'Person must be initialized with str, not {type(s).__name__}'
         raise TypeError(msg)
      # end
      self._name = s
   # end

   def __str__(self):
      """Return string representation of self."""
      return self._name
   # end

   def __repr__(self):
      """Return a detailed string representation of self."""
      return f"person.{type(self).__name__}( '{self._name}' )"
   # end

   @property
   def first_name(self):
      """Return first name of self."""
      return self._name.split()[0]
   # end

   @property
   def last_name(self):
      """Return last name of self."""
      return self._name.split()[-1]
   # end

   @property
   def full_name(self):
      """Return full name of self, last name first."""
      last = self.last_name
      rest = ' '.join(self._name.split()[:-1])
      return f'{last}, {rest}'
   # end

# end

class Student(Person):
   """Class representing a Student, subclass of Person."""

   def __init__(self, s):
      """Initialize a Student object."""
      super().__init__(s)
      self._student_id = '{:0>7}'.format(rng.randint(10, 10**7))
   # end

   def __str__(self):
      """Return a string representation of self."""
      return super().__str__()+', sid: '+self.student_id
   # end

   @property
   def student_id(self):
      """Return student id number."""
      return self._student_id
   # end
# end

class Employee(Person):
   """Class representing an Employee, subclass of Person."""

   def __init__(self, s):
      """Initialize an Employee object."""
      super().__init__(s)
      self._employee_id = '{:0>8}'.format(rng.randint(10, 10**8))
   # end

   def __str__(self):
      """Return a string representation of self."""
      return super().__str__()+', eid: '+self.employee_id
   # end

   @property
   def employee_id(self):
      """Return employee id number."""
      return self._employee_id
   # end

# end

class StudentEmployee(Student, Employee):
   """
   Class representing a Student Employee, subclass of both Student and 
   Employee.
   """

   def __init__(self, s):
      """Initialize an Student Employee object."""
      super().__init__(s)
   # end
   
   def __str__(self):
      """Return a string representation of self."""
      return super().__str__()
   # end

# end   


# test Person class(es)
def main():

   A = Person()  # try putting something not str as argument
   B = Person('William H. Bradshaw')
   C = Student('Barbara K. Crawford')
   D = Employee('Thomas W. Holder')
   E = StudentEmployee('Karen Jean Bryce-Jennings')

   print()
   print(A)

   print()
   print(B)
   print(repr(B))
   print(B.first_name)
   print(B.last_name)
   print(B.full_name)
   
   print()
   print(C)
   print(repr(C))

   print()
   print(D)
   print(repr(D))

   print()
   print(E)
   print(repr(E))

   print()


# end


#------------------------------------------------------------------------------
if __name__=='__main__':

   main()

# end