""" BirthdayBook.py ***An introductory OOP Python activity demonstrating
classes, attributes and methods*** """
###CLASSES ##Uses three classes:BirthdayBook, BirthdayEntry, Engine

class BirthdayBook():
#Note: Methods for classes appear as functions
    # creates  instance of the class called 'friends' as a list
    def __init__(self):
        self.friends = []

    def add_newentry(self, new_entry):
        # adds entry to BirthdayBook list
        self.friends.append(new_entry)

##    def display(self):
##        for friend in self.friends:
##            friend.display()


class BirthdayEntry():
    # multiple instances of class hold friend details
    # initialise attributes
    # class requires its methods to be initialised with the argument 'self'
    def __init__(self, given_name = None, family_name = None,
                 email_address = None, DOB = None):
        self.given_name  = given_name
        self.family_name = family_name
        self.email_address = email_address
        self.DOB = DOB
        
# syntax for formatting needs explanation for students
    def display(self):
        print('{} {}: {} {}'.format(self.given_name, self.family_name, self.email_address, self.DOB))
   
    
class UserInterface():
    def __init__(self, book):
        self.birthday_book = book
        self.choices()

    def confirm_quit(self):
        outofhere=input("""If you respond y, all data will be lost
                        as no module exists for saving to a file.
                        Do you really want to quit? y/n?""")
        if outofhere=='n':
            return False
        else:
            return True
    
    def add_entry(self):

        print ("Adding a new person")
        print("What is persons's: ")
        given_name = input("Given Name? ")
        if given_name =="q":
            print("Not adding")
            return
        
        family_name = input("Family Name? ")
        if family_name =="q":
            print("Not adding")
            return

        email_address =input("Email address? ")
        while "@" not in email_address:
            print("Invalid email")
            email_address = input("Email address? ")
            if email_address =="q":
                print("Not adding")
                return

        DOB_PROMPT = "Date of Birth in form DD MM YY? "
        DOB = input(DOB_PROMPT)
        if DOB=="q":
            print("Not adding")
            return

        birthday_entry = BirthdayEntry(given_name, family_name, email_address, DOB)
        self.birthday_book.add_newentry(birthday_entry)
        print("Added Birthday entry for {} {}".format(given_name,family_name))



    def display_summaries(self):
        print()
        print("**************************************")
        print("   Displaying my Address Book   ")
        print("**************************************")
        ##this will be used to display the birthday book as it now exits with its set entries
        self.birthday_book.display()
        print("**************************************")
    
    def choices(self):
        # define Help as string constant as it is used more than once
        Help ="""An OOP Birthday Book Python program
                Use:
                a to add an entry
                d to display all save entries in Address Book
                i to see the instructions
                q to quit
                """
        while True:
            print()
            print(Help)
            choice = input("Make a selection from the above ")
            if choice=="a":
                self.add_entry()
            elif choice=="q":
                if self.confirm_quit()==True:
                    print("Exiting the Birthday book.")
                    break
            elif choice=="i":
                    print(Help)
            elif choice=="d":
                    self.display_summaries()
            else:
                    instruction_message = "This was not one of my choices: {}"
                    print(instruction_message.format(choice))


# the main program starts here
# program is limited to entries created while running in addition to
# the following 'hard-wired'entries until students learn to save and read external files
book = BirthdayBook()
book.add_newentry(BirthdayEntry('Bob', 'Smith', 'bsmith@python.com', '11111'))
book.add_newentry(BirthdayEntry('Mary', 'Smith', 'msmith@python.com', '22222'))

UserInterface(book)