from tkinter import *

#Login GUI
window = Tk()
window.title("Countries Generation")
window.geometry("400x300")
window.configure(bg="#cccccc")

username = "admin"
password = "secret"

def callback():
        if (user == username) and (passw == password):
            message.configure(text = "Valid Logged in.")
        else:
            message.configure(text = "Username and password don't match. \nPlease try again.")

title1 = Label(window, text="Log in", bg="#6491ca")
usertitle = Label(window, text="---Username---", bg="#6491ca")
passtitle = Label(window, text="---Password---", bg="#6491ca")
message = Label(window, bg="#6491ca")

user = Entry(window)
passw = Entry(window, show='*')

go = Button(window, text="Log in!", command = callback, bg="#3e3365")

title1.pack()
usertitle.pack()
user.pack()
passtitle.pack()
passw.pack()
go.pack()
message.pack()

window.mainloop()

#Lists
countryList1 = []

#function   1
def readCountries(letterChosen,fh):
        counter = 0
        countryList2 = []
        populationList = []
        dataInList = fh.readlines()
        for x in range(0,len(dataInList)):
                data = dataInList[x]
                data = data.strip("\n")
                data = data.strip()
                dataInList[x] = data
                fh.close()
        for x in range(0, len(dataInList)-1):
                Length = dataInList[x]
                dataInList2 = Length.rsplit('-',1)
                countryList1.append(dataInList2[0])
                populationList.append(dataInList2[1])
        for x in countryList1:
                if(countryList1[counter][:1] == letterChosen):
                        countryList2.append(countryList1[counter][:-1])
                        counter+=1
                else:
                        counter+=1
        for x in range(0, len(countryList2)):
                print(countryList2[x])
        print("The total amount of countries that start with the letter", letterChosen,":",len(countryList2))
        return(populationList, countryList2)

#function   2

#Main
letterChosen = str(input("Enter Only The First Letter: "))

try:
        fh = open("Countries.txt", "r")
except IOError:
    print("The File does not exist or an Error opening it.")



readCountries(letterChosen,fh)

#This allows the input to only accepts 1 letter
if len(letterChosen) > 1:
        print ("Error! Only 1 Letter is Allowed!")

#This allows the input to only accepts letters
elif not re.match("^[A-Za-z]*$", letterChosen):
    print ("Error! Only letters a-z allowed!")

print("\n")