/// <summary>
/// This function performs the action indicated by the user's input.
/// </summary>
private static async Task PerformScreenAction(CLIScreen screen)
{
int totalOptions = screen.Options.Count;
string input = Console.ReadLine();
if (int.TryParse(input, out int enteredNumber))
{
if (enteredNumber >= 1 && enteredNumber <= totalOptions)
{
screen.state = CLIScreenState.Complete;
await screen.Options[enteredNumber - 1].Command(enteredNumber, String.IsNullOrEmpty(screen.SelectionHistory) ? screen.Options[enteredNumber - 1].Name : screen.SelectionHistory + " -> " + screen.Options[enteredNumber - 1].Name);
}
else if (screen.PreviousScreen != null && enteredNumber == totalOptions + 1)
{
screen.PreviousScreen.state = CLIScreenState.Incomplete; // show previous screen again.
screen.state = CLIScreenState.Complete;
return;
}
else
{
screen.InputValidationError = "Operation " + enteredNumber + " not found. Please enter the number for the operation you like to start.";
return;
}
}
else
{
screen.InputValidationError = "Invalid input. Please enter a number.";
return;
}
}
/// <summary>
/// Prints the contents of the provided screen.
/// </summary>
/// <param name="screen">The <c>CLIScreen</c> object to print.</param>
private static void PrintScreen(CLIScreen screen)
{
int totalOptions = screen.Options.Count;
if (totalOptions == 0)
{
screen.state = CLIScreenState.Complete;
}
if (String.IsNullOrEmpty(screen.InputValidationError))
{
Console.Clear();
if (!String.IsNullOrEmpty(screen.SelectionHistory))
{
Console.WriteLine("Selection History: " + screen.SelectionHistory + "\n");
}
Console.WriteLine(String.IsNullOrEmpty(screen.InfoBeforeOptions) ? "The list of options to choose from:\n" : screen.InfoBeforeOptions);
DisplayOptions(screen);
}
else
{
Console.WriteLine(screen.InputValidationError);
}
Console.Write(String.IsNullOrEmpty(screen.InfoAfterOptions) ? "Please enter the number(1/2/..) for the operation you'd like to start: " : screen.InfoAfterOptions);
}
/// <summary>
/// This function displays the provided screen.
/// </summary>
public static async Task ShowScreen(CLIScreen screen)
{
screen.PreviousScreen = currentScreen;
currentScreen = screen;
while (screen.state == CLIScreenState.Incomplete)
{
PrintScreen(screen);
await PerformScreenAction(screen);
}
currentScreen = screen.PreviousScreen;
}
private static void DisplayOptions(CLIScreen screen)
{
int currOptionNumber = 1;
foreach (CLIOption option in screen.Options)
{
Console.WriteLine("\t" + currOptionNumber.ToString() + ". " + option.Name);
currOptionNumber++;
}
if (screen.PreviousScreen != null)
{
Console.WriteLine("\t" + currOptionNumber.ToString() + ". " + "Back");
}
}