# Time sheet problem

# Function to return a valid date
def GetDate(Message):
    # Iterate until valid date entered in format dd/mm
    IsValid = False
    while not IsValid:
        InputDate = input(Message)
        # Length check
        if len(InputDate) == 5:
            # Format check
            if InputDate[2] == "/":
                # Type check
                if InputDate[0:2].isnumeric():
                    Day = int(InputDate[0:2])
                    if InputDate[-2:].isnumeric():
                        Month = int(InputDate[-2:])
                        # Range check - only checking month so not comprehensive
                        if Month >= 1 and Month <= 12:
                            IsValid = True
                            MonthList = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]
        if not IsValid:
            print("Invalid date entered.")
    return MonthList[Month - 1], InputDate

# Function to return valid number 
def GetNumber(Message):
    ValidInput = False
    # Validation
    while not ValidInput:
        Number = input(Message)
        # Type check
        if Number.isnumeric():
            ValidInput = True
        if not ValidInput:
            print("Invalid number.")
    return Number

# Function to return a month 
def GetMonth(Message):
    ValidInput = False
    # Validation
    while not ValidInput:
        Month = input(Message)
        # Lookup check
        if Month in ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]:
            ValidInput = True
        else:
            print("Invalid month.")
    return Month

# Subroutine to update time sheet
def UpdateTimeSheet():
    Filename, InputDate = GetDate("Enter the date in the format dd/mm: ")
    Hours = GetNumber("Enter the number of hours: ")
    try:
        File = open(Filename,"a")
        File.write(InputDate + "\n")
        File.write(Hours + "\n")
        File.close()
    except:
            print("Failed saving the update.")

# Subroutine to output the time sheet
def OutputTimeSheet():
    Filename = GetMonth("Input the month, e.g. January: ")
    try:
        File = open(Filename,"r")
        Data = File.read()
        File.close()
        print(Data)
    except:
        print("Error, file not found.")

# Main program
UpdateTimeSheet()
OutputTimeSheet()