# math-, random- and datetime modules today!
print("Welcome!")

# NEW FILE

# adding new lines within text
print("Some text here.\n\nAnother line!")

# an empty print() also prints a single \n by default
print()

# tabs can be used to align pieces of text horizontally
# remember to have enough \t to match long words
print("Total:\t\t350 €")
print("Postage:\t40 €")

# NEW FILE

# this kind of a structure is quite clear
# for the exercise sets etc.

# PART 1: ask all needed values from the user
# ask the values from the user
salary = input("Give your salary:\n")
salary = float(salary)

savings = input("How much savings do you have?\n")
savings = float(savings)

# PART 2 - the actual calculation logic of the code
# combine salary and savings, add 25%
total = (salary + savings) * 1.25

# PART 3 - print out the results
print(f"Total money: {total} €")

# NEW FILE

import math

# avoid hardcoded Pi-values  (like 3.14)
# always use math.pi
print(math.pi)
print()

# radius = 13
radius = input("Give a radius:\n")
radius = int(radius)

# circumference of the circle
# 2 * pi * radius
border = 2 * math.pi * radius

# round the border to two decimals
# remember to save to variable
# only round(border, 2) does not work in code
border = round(border, 2)
print(f"Circumference: {border} m")

# NEW FILE

import math

# 3 to the power of 5
number1 = math.pow(3, 5)
print(number1)

# ... or Python
number2 = 3 ** 5
print(number2)

number3 = 25
root_value = math.sqrt(number3)
print(root_value)

# length of a body diagonal of a cube = sqrt 3 * side
side = 14
diagonal = math.sqrt(3) * side
print(diagonal)

# NEW FILE

import random

# generate a random number between 1 and 10
guess = random.randint(1, 10)
print(guess)
print()

# let's generate two random dice
# basic dice 1-6
dice1 = random.randint(1, 6)
dice2 = random.randint(1, 6)

print(dice1)
print(dice2)

# NEW FILE

from datetime import datetime
# if we used import datetime, our code would need to be
# today = datetime.datetime.now()

today = datetime.now()

# print(today)
# formatting logic for date
# %d = day, %m = month, %Y = year, %H = hour, %M = minutes, %S = second
# removing the extra zeroes in days and months:
# in Windows: %#d and %#m
# in Unix / Linux / MacOS %-d and %-m
date_text = today.strftime("%d.%m.%Y %H:%M:%S")
print(date_text)

# NEW FILE

from datetime import date, datetime, timedelta

first = date(2023, 9, 25)
second = date(2023, 12, 31)

delta = second - first
days = delta.days

# end result
print(f"Days left for this year: {days}")

# if we create a bill today, what is the due date in 2 weeks?
# e.g. = 14 days
today = datetime.now()
today = today + timedelta(14)

date_text = today.strftime("%d.%m.%Y")
print(date_text)

# NEW FILE

# careful with float-numbers, with small values, you might get weird decimals
# use either round() or Decimal-module to fix this
number1 = 0.1
number2 = 0.2

print(number1 + number2)

# NEW FILE

from datetime import date
import math

# variables for the compound interest calculation
start_money = 25000
interest_rate = 0.07

# calculate the amount of days and years in this timespan
start_date = date.today()
end_date = date(2033, 12, 31)

# for how many years are we going to save money?
delta = end_date - start_date
days = delta.days
years = days // 365

# compound interest
# final amount of money = start money * (1 + interest_rate) ^ years
total_money = start_money * math.pow(1 + interest_rate, years)
new_money = total_money - start_money
new_money = round(new_money, 2)
print(f"With given parameters, we earned this much money {new_money} €")

# NEW FILE
# https://mathsisfun.com/algebra/exponential-growth.html

import math
from datetime import datetime

# when we drank the last coffee
start_time = datetime(2023, 9 , 25, 9, 0, 0)
end_time = datetime(2023, 9, 25, 22, 0, 0)

# how many hours ago?
duration = end_time - start_time
seconds = duration.total_seconds()
minutes = seconds / 60
hours = minutes // 60
hours = int(hours)

# let's assume half-life of coffee is 5 hours
half_life = 5

# let's assume our coffee cup is 300ml
cup = 300

# half-life = cup * exp ^ (ln(0.5)/half_life)*hours
logarithm = math.log(0.5) / half_life
coffee_left = cup * math.exp(logarithm * hours)
coffee_left = int(coffee_left)

print(f"From the original {cup} ml of coffee I drank {hours} hours ago.")
print(f"{coffee_left} ml of coffee is still left in my body.")