# Chapter3.py  Functions

'''
Principles of Programming
Law of Demeter
https://en.wikipedia.org/wiki/Law_of_Demeter

DRY
https://en.wikipedia.org/wiki/Don%27t_repeat_yourself
'''

'''
Functions vs Methods
Functions -> themselves
Methods -> something else ? what object passing it to (that obj has to exist) classes page 53
'''

# Basic Functions page 38

'''
Stuck in coding?
1. did I define it? aka does it exist?
2. did I give it value? Law of Demeter
3. did I return it? function->itself method->something else
'''

'''
3 types of functions/methods
myFunction() # empty function aka we are not passing it any data
myFunction(param1, param2, ...) # parameterized function, which means it EXPECTS you to pass args<aka data> to it
myFunction(param1, param2="value") # Query String Parameter or Default Value Parameter

(fullname, vipStatus=False)
arg (Bob Smith) -> (Bob Smith, False)
arg (Bob Smith, True) -> (Bob Smith, True)
arg (Bob Smith, False) -> (Bob Smith, False)

Python REQUIRES all default value params to be at the end
====> Know your data models!
(fName, mInitial="", lName, vipsStatus=False) -> error in Python
(fName, lName, mInitial="", vipStatus=False) -> ok
'''

def ccInfoInput():
    # Ask the user to enter their credit card informaion, using ccNum, ccExp, ccCode and ccZip
    print("=== Please provide your credit card info for your purchase ===")
    # Credit Card Number
    ccNum = input('Enter you credit card number: ')
    # Expiration Date
    ccExp = input('Enter Expiration Date (mm/yyyy): ')
    # Security Code
    ccCode = input('Enter your Security Code: ')
    # Zip Code
    ## Use 5 digit format, not 5-4 format
    ccZip = input('Enter your zip code (12345): ')
    # Create a tuple with the user-supplied inputs
    ccInfo = (ccNum, ccExp, ccCode, ccZip)
    print(ccInfo)  # function
    return ccNum, ccInfo # method

# Calling the Function
ccInfoInput() # We see the ccInfo tuple from the print()

# Create an instance from the Method
resultNum, resultInfo = ccInfoInput() # Use the return of the value, using the methods return keyword and assigns that value to result
print(resultNum)
print(resultInfo) # print the variable result

# EOF