""" BirthdayBook.py ***An introductory OOP Python activity demonstrating
classes, attributes and methods inclusing saves to external text file*** """

###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)

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
    
class UserInterface():
    def __init__(self):
        self.birthday_book = BirthdayBook()
        self.choices()

    def confirm_quit(self):
        outofhere = input("Do you really want to quit? y/n?")
        if outofhere.lower()=='y' or outofhere.lower()=='yes':
            return True
        else:
            return False
    
    def add_entry(self):

        print ("Adding a new person")
        print("What is persons's: ")
        ## allow user to escape entry while editing
        given_name = input("Given Name? ")
        if given_name.lower()== "q":
            print("Not adding")
            return
        
        family_name = input("Family Name? ")
        if family_name.lower()=="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.lower()=="q":
                print("Not adding")
                return

        DOB_PROMPT="Date of Birth in form DD MM YY? "
        DOB = input(DOB_PROMPT)
        if DOB.lower()=="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))
        f = open("workfile.txt","a+") 
        e = birthday_entry
        saveline = ("{} {}   DOB:{}   email:{}".format(e.given_name, e.family_name, e.DOB, e.email_address))
        f.write(saveline+"\n")
        f.close()


    def display_summaries(self):
        print()
        print("**************************************")
        print("   Displaying my saved Address Book   ")
        print("**************************************")
        f=open("workfile.txt","r+")
        for line in f:
            print(line)
        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.lower()=="a":
                self.add_entry()
            elif choice.lower()=="q":
                if self.confirm_quit()==True:
                    print("Exiting the Birthday book.")
                    break
            elif choice.lower()=="i":
                    print(Help)
            elif choice.lower() =="d":
                    self.display_summaries()
            else:
                    instruction_message = "This was not one of my choices: {}"
                    print()
                    print(instruction_message.format(choice))


UserInterface()