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

# NEW FILE

# math-, random- and datetime-modules today!

# adding new lines among text
print("Here's some text\n\n\nAnother line")

# printing without text also prints a new line by default
print()

# you can use tabs to position texts on screen
print("Total:\t\t350€")
print("Total cost:\t199€")

# NEW FILE

# first phase, ask all needed variables from user with input()
salary = input("Give your salary:\n")
salary = float(salary)

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

# second phase, do the calculations

# our total money is salary + savings, increased by 25%
total = (salary + savings) * 1.25

# third phase, print out the results
print(f"Total money: {total} €")

# NEW FILE

import math

print(math.pi)

# border of circle = 2 * pi * radius
radius = input("Give radius:\n")
radius = int(radius)

border = 2 * math.pi * radius
print(f"Border: {border}")

# NEW FILE

import math

print(math.pi)

# border of circle = 2 * pi * radius
radius = input("Give radius:\n")
radius = int(radius)

# computer border and round to two decimals
border = 2 * math.pi * radius
print(f"Border: {border}")

border = round(border, 2)
print(f"Border: {border}")

# NEW FILE

import math

# 5 to the power of 8, two ways
number1 = 5 ** 8
number2 = math.pow(5, 8)

print(number1)
print(number2)

# square root of 25 is 5
number3 = 25
root_value = math.sqrt(number3)
print(root_value)

# programmers often have to convert mathematical
# equations into actual code, example:
# diagonal of a cube = square root of 3 * side
side = 15
diagonal = math.sqrt(3) * side

# NEW FILE

import random

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

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

# print the dice values
print(dice1)
print(dice2)

# UUSI TIEDOSTO

from datetime import date

# get current date, YEAR-MONTH-DAY
today = date.today()

print(f"Today is {today}")

# NEW FILE

from datetime import datetime

today = datetime.now()
print(today)

# formatting logic for date:
# %d = day, %m = month, %Y = year, %H = hour, %M = minutes, %S = seconds
date_text = today.strftime("%d.%m.%Y %H:%M:%S")

print(date_text)

# NEW FILE

from datetime import date, datetime, timedelta

# how many days are left this year
today = date.today()
future = date(2022, 12, 31)

delta = future - today
days = delta.days

print(f"Days left this year: {days}")

# if we borrow a book today, and the return is after 14 days,
# when is the actual return date?
today = datetime.now()
today = today + timedelta(14)
print(today)

# NEW FILE, BIGGER EXAMPLE

from datetime import date
import math

# compound interest formula
# future money = start money * math.pow(1 + interest rate, number of years)

# start money and interest rate (decimal)
start_money = 25000
interest_rate = 0.07

# how many years between two dates
start_date = date.today()
end_date = date(2032, 12, 31)
delta = end_date - start_date
days = delta.days
years = days // 365

# compound interest
total_money = start_money * math.pow(1 + interest_rate, years)

# actual money earnt while saving
new_money = total_money - start_money
new_money = round(new_money, 2)

# all done, print out results
print("With the given parameters, we earnt this much money:")
print(f"{new_money} €")

# ANOTHER EXAMPLE, HOW MUCH TIME IT TAKES TO HALVE THE AMOUNT OF COFFEE IN YOUR BODY

import math
from datetime import datetime

start_time = datetime(2022, 9, 21, 13, 45, 0)
end_time = datetime(2022, 9, 21, 23, 45, 0)
duration = end_time - start_time
seconds = duration.total_seconds()
minutes = seconds / 60
hours = minutes / 60

hours = int(hours)

# 300 ml
cup = 300

# coffee half-life 4 hours, found from Google
half_life = 4

# https://www.mathsisfun.com/algebra/exponential-growth.html
# 9 hours => cup * exp ** (log(0.5) / half_life) * hours
logarithm = math.log(0.5) / half_life
coffee_left = cup * math.exp(logarithm * hours)

coffee_left = round(coffee_left)

# calculate the amount of coffee you have in your body, after a certain time
print(f"Coffee left: {coffee_left} ml")