#This program will ask for a shape and measurement. It will calculate the chosen shapes perimiter and area based on the measurement given.
import math
#Collect input
name = input('What is your name? ')
print(f'Kia ora {name}')

keep_going = ''

print('This program calculates the perimiter and area of different shapes.')
while keep_going == '':
    shape = input(f'{name}, what  shape do you want to select? square, triangle, rectangle or circle? press "s" for square, "t" for triangle, "r" for rectangle or "c" for circle ')
    if shape == 's':
        length = float(input('What is the length of your square? '))
        measurement = input('What units of measurement are you using? ')
        perimeter = length + length + length + length
        area = length * length
        print(f'The perimeter of a square with a length of {length} {measurement} is {perimeter} {measurement} and the area is {area} {measurement}².')
    elif shape == 't':
        length_a = float(input('What is length "a" of your triangle? '))
        length_b = float(input('What is length "b" of your triangle? '))
        length_c = float(input('What is length "c" of your triangle? '))
        measurement = input('What units of measurement are you using? ')
        perimeter = length_a + length_b + length_c
        semi_perimeter = perimeter / 2
        area = math.sqrt(semi_perimeter * (semi_perimeter - length_a) * (semi_perimeter - length_b) * (semi_perimeter - length_c))
        print(f'The perimiter of a rectangle with a length "a" of {length_a} {measurement}, a length "b" of {length_b} {measurement} and length "c" of {length_c} {measurement} is {perimeter} {measurement} and the area is {area} {measurement}².')
    elif shape == 'r':
        length = float(input('What is the length of your rectangle? '))
        width = float(input('What is the width of your rectangle? '))
        measurement = input('What units of measurement are you using? ')
        perimeter = width + length + width + length
        area = length * width
        print(f'The perimiter of a rectangle with a length of {length} {measurement} and a width of {width} {measurement} is {perimeter} {measurement} and the area is {area} {measurement}².')
    elif shape == 'c':
        radius = float(input('What is the radius of your circle? '))
        measurement = input('What units of measurement are you using? ')
        circumference = 2 * 3.14 * radius
        area = 3.14 * (radius * radius)
        print(f'The circumference of a circle with a radius of {radius} {measurement} is {circumference} {measurement} and the area is {area} {measurement}².')
    else:
        print('You have chosen an invalid shape')
        
    keep_going = input('Do you want to find measurements for another shape? Press enter if yes, type no if no.')
    
#Display output    
 
print('The program has ended')