import statistics
user_stats = []


def program_menu():
print("Welcome message to the user to explain what the programm is going to do")
choice = continue_choice()
if choice.lower() == 'y':
    stats = collect_user_health_stats('y')
    print("there are ", len(stats), "in the data set.")
    print("The values as follows:", end=" ")
    print(stats)
    get_lowest(stats, 'age')
    get_highest(stats, 'age')
    get_average(stats, 'age')
    get_mean(stats, 'age')
   # get_mode(stats, 'age')
    get_range(stats, 'age')
    get_lowest(stats, 'weight')
    get_highest(stats, 'weight')
    get_average(stats, 'weight')
    get_mean(stats, 'weight')
    #get_mode(stats, 'weight')
    get_range(stats, 'weight')
    get_lowest(stats, 'height')
    get_highest(stats, 'height')
    get_average(stats, 'height')
    get_mean(stats, 'height')
    #get_mode(stats, 'height')
    get_range(stats, 'height')
    get_lowest(stats, 'bmi')
    get_highest(stats, 'bmi')
    get_average(stats, 'bmi')
    get_mean(stats, 'bmi')
    #get_mode(stats, 'bmi')
    get_range(stats, 'bmi')


else:
    return


def continue_choice():
print("Would you like to continue? (Y/N)", end=" ")
choice = str(input()).upper()
print(choice)
while choice != "Y" and choice != "N":
    print("invalid option:Would you like to continue ?(Y/N) . ")
    choice = str(input()).upper()
return choice

def collect_user_health_stats(choice):
while choice == 'y':
    height = get_user_height()
    weight = get_user_weight()
    age = get_user_age()
    bmi = weight / height
    bmi = round((bmi / height),2)
    weight_category = weight_category(bmi)

    user_stats.append({'height': height, 'weight': weight, 'age': age, 'bmi': bmi, 'weight_category': weight_category})
    print("Do you want to enter stats for another person? (Y/N)", end=" ")
    choice = continue_choice()
    print(choice)
    collect_user_health_stats(choice.lower())
return user_stats

def get_user_height():
height = get_height_input()
param = get_height_measured_input()
height = calculate_height(float(height), str(param))
return height


def get_height_input():
print("Please enter person height!", end=" ")
height = eval(input())
if not height or type(height) not in (float, int):
    print("Invalid height entered!")
    get_height_input()
return height


def get_height_measured_input():
print("Height measured in meters(m) or feet (ft) or inches (in) ?", end=" ")
param = input()
if not param or type(param) != str or str(param) not in ('m', 'meters', 'ft', 'feet', 'in', 'inches',):
    print("Invalid choice selected")
    get_height_measured_input()
return param


def calculate_height(height, param):
if param == 'ft' or param == 'feet':
    return height / 3.2808  # 1 meter = 3.2808 feet
elif param == 'in' or param == 'inches':
    return height / 39.370  # 1 meter = 39.3701 inch
else:
    return height


def get_user_weight():
weight = get_weight_input()
param = get_weight_measured_input()
weight = calculate_weight(float(weight), str(param))
return weight


def get_weight_input():
print("Please enter person weight!", end=" ")
weight = eval(input())
if not weight or type(weight) not in (float, int):
    print("Invalid weight entered!")
    get_weight_input()
return weight


def get_weight_measured_input():
print("Weight measured in pounds(lb) or stone (st) or kilograms (kg) ?", end=" ")
param = input()
if not param or type(param) != str or str(param) not in ('lb', 'pounds', 'st', 'stone', 'kg', 'kilograms',):
    print("Invalid choice selected")
    get_weight_measured_input()
return param


def calculate_weight(weight, param):
if param == 'lb' or param == 'pounds':
    return weight / 2.2046  # 1 kg = 2.2046 pounds
elif param == 'st' or param == 'stone':
    return weight / 0.15747  # 1 kg = 0.15747 stone
else:
    return weight


def get_user_age():
print("Please enter person age", end=" ")
age = eval(input())
if not age or type(age) not in (float, int):
    print("Invalid age entered!")
    get_user_age()
return int(age)

def weight_category(bmi):


if bmi <= 18.5:
   print(" You are underweight.")
elif bmi > 18.5 and bmi < 25:
   print(" You are Healty.")

elif bmi > 25 and bmi < 30:
   print("You are overweight.")

elif bmi > 30:
   print("You are obese.")

else:

  print(" Ther is an error please try again")
return weight_category

def spread_stats(stats, key):
return [x[key] for x in stats]


def get_average(stats, key):
# this function return average from list
sum_total = sum(spread_stats(stats, key))
avg = sum_total / len(spread_stats(stats, key))
print("The average {key} in the list is :".format(key=key), avg)
return round((avg),2)


def get_lowest(stats, key):
# this function return max from list
value = min(spread_stats(stats, key))
print("The lowest {key} entered is :".format(key=key), value)
return value


def get_highest(stats, key):
# this function return max from list
value = max(spread_stats(stats, key))
print("The highest {key} entered is :".format(key=key), value)
return value


def get_mean(stats,key):
numbers = spread_stats(stats, key)
value = float(sum(numbers)) / max(len(numbers), 1)
print("The mean {key} entered is :".format(key=key), value)
return round((value),2)


def get_mode(stats,key):
numbers = spread_stats(stats, key)
value = statistics.mode(numbers)
print("The mode {key} entered is :".format(key=key), value)
return round((value),2)


def get_range(stats,key):
numbers = spread_stats(stats, key)
range =  max(numbers) - min(numbers)
print("The range {key} entered is : {minimum} - {maximum}".format(key=key,minimum = min(numbers), maximum = max(numbers)))
return range
program_menu()