# Own functions in Python

# functions.py - file

# our first function!
def print_title():
    print("Welcome to our app!")
    print("-------------------")
    print("Please follow the instructions")
    print()


# three parameters!
def combine_text(first_name, surname, age):
    print(f"{first_name} {surname}, {age} years old!")


# returning data into a variable
def get_year():
    result = 2021
    return result

# check if given number is even/odd
def get_even_number_text(number):
    if number % 2 == 0:
        return "Even number!"
    else:
        return "Odd number!"

# function, hours to days
def get_days(hours):
    result = hours // 24
    return result


# helper function, reverse the given parameter and return it
def reverse_string(text):
    result = text[::-1]
    return result


# helper function, checks if given parameter
# is a palindrome or not. returns either True or False
def check_palindrome(text):
    reversed_text = reverse_string(text)

    if text == reversed_text:
        return True
    else:
        return False


# example validation function
# checks if given order code is okay
# a valid code is 10 characters long +
# first character has to be T
def check_order(code):
    okay = True

    if len(code) != 10:
        okay = False

    if code[0] != "T":
        okay = False

    return okay


# helper function, calculates average of given number list
def get_list_average(numbers):
    # average = total sum / amount of numbers
    total = sum(numbers)
    amount = len(numbers)

    result = total / amount
    return result


# loops are also okay in a function!
def show_vertical_text(text):
    for c in text:
        print(c.upper())


# example recursive function
def factorial(number):
    if number == 1:
        return number
    else:
        next_number = number - 1
        total = number * factorial(next_number)
        return total

# exercise files

from functions import *

# call our first function!
print_title()

print()

# call our function that takes three parameters
combine_text("John", "Doe", 31)

print()

# NEW FILE

from functions import *

# if functions returns data, remember to catch it in a variable
year = get_year()

print(year)

# NEW FILE

from functions import *

# ask number from user, convert to int
number = input("Give a number:\n")
number = int(number)

# check if the number is even/odd with our function
result = get_even_number_text(number)

# print result text
print(result)

# NEW FILE

from functions import *

user_text = input("Give a text:\n")

# reverse user's text with our own function
reversed_text = reverse_string(user_text)

print(reversed_text)

# NEW FILE

from functions import *

# hours from user, to int
user_hours = input("How many hours?\n")
user_hours = int(user_hours)

# get number of days in hours with our own function
days = get_days(user_hours)

print(f"{user_hours} hours is {days} days in total!")

# NEW FILE

from functions import *

text = input("Give some text:\n")

# call our own function that checks if it's a palindrome
# returns True or False
result = check_palindrome(text)

if result:
    print("PALINDROME!")
else:
    print("Not a palindrome...")

# NEW FILE

from functions import *

user_code = input("Provide a code:\n")

# check if the given code is in correct format with our own function
# a good code is 10 characters long exactly and first letter is T
result = check_order(user_code)

if result:
    print("Code is valid!")
else:
    print("Incorrect code...")

# NEW FILE

from functions import *

# some number lists for testing
values = [3, 5, 7, 8, 4, 5, 3, 2]
temperatures = [-5, -11, -15, -12, -13, -25]
grades = [3, 4, 2, 3, 3, 1, 5, 5]

# let's use our average function three times!
# quite handy? :)

# get average of numbers
average = get_list_average(values)
print(round(average, 2))

# get average of temperatures
average = get_list_average(temperatures)
print(round(average, 1))

# get average of grades
average = get_list_average(grades)
print(average)

# NEW FILE

from functions import *

show_vertical_text("hotel")

# NEW FILE

from functions import factorial

# call the recursive function
# (a function that calls itself repeatedly)
result = factorial(6)
print(result)