import os

filename = None
metric = None
action = None

def read(filename):
    with open(filename) as file:
            filecontents = file.read()

    print(filecontents)

def column(filename):
    with open(filename, 'r') as f:
        results []
        for line in f:
            words = line.split(',')
            results.append((words[0], words[1:]))




            #results.append((words[0], words[1:]))
       # print(results)

#def min_calculation():

#def mean_calculation()
#def median_calculation():
#def harmonic_mean_calculation():


def calculation(metric,action):

    if action == "list":
        if metric == "min":
            action == None
        elif metric == "mean":
            action == None
        elif metric == "median":
            action == None
        elif metric == "harmonic mean":
            action == None
    elif action == "correlation":
        if metric == "min":
            action == None
        elif metric == "mean":
            action == None
        elif metric == "median":
            action == None
        elif metric == "harmonic mean":
            action == None

    # DO CAPITAL LETTERS AND SPACE CHECK

def file_noexist(filename):
    if not os.path.isfile(filename):
        filename = input("This file does not exist, please enter the name of the file you wish to read ").lower().strip()
        file_noexist(filename)

def metric_noexist(metric):
    if metric not in {"min", "mean", "median", "harmonic mean"}:
        metric = input("Incorrect choice, please choose a metric from min, mean, median, harmonic mean ").lower().strip()
        metric_noexist(metric)

def action_noexist(action):
    if action not in {"list","correlation"}:
        action = input(
            "Incorrect choice, please chose an action to be performed on the data using the specified metric. "
            "Options are list, correlation ").lower().strip()
        action_noexist(action)

def userinput():
    filename = input("Enter the name of the file you wish to read ").lower().strip()
    file_noexist(filename)

    metric = input("Please choose a metric from min, mean, median, harmonic mean ").lower().strip()
    metric_noexist(metric)

    action = input("Chose action to be performed on the data using the specified metric. Options are list, correlation ").lower().strip()
    action_noexist(action)

    return filename, metric, action



def main():
    filename, metic, action = userinput()
    read(filename)
    column(filename)
    calculation(metric,action)

if __name__ == "__main__":
    main()