package bin;

import lib.CLIAppBase;

using tink.CoreApi;

class Turtle extends CLIAppBase {
	public function new() {
		registerSyncSubcommand("forward", (args) -> {
			return checkAvailable() && perform(kernel.turtle.Turtle.instance.forward());
		});

		registerSyncSubcommand("back", (args) -> {
			return checkAvailable() && perform(kernel.turtle.Turtle.instance.back());
		});

		registerSyncSubcommand("left", (args) -> {
			return checkAvailable() && perform(kernel.turtle.Turtle.instance.turnLeft());
		});

		registerSyncSubcommand("right", (args) -> {
			return checkAvailable() && perform(kernel.turtle.Turtle.instance.turnRight());
		});

		registerSyncSubcommand("up", (args) -> {
			return checkAvailable() && perform(kernel.turtle.Turtle.instance.up());
		});

		registerSyncSubcommand("down", (args) -> {
			return checkAvailable() && perform(kernel.turtle.Turtle.instance.down());
		});
	}

	private function checkAvailable():Bool {
		if (!kernel.turtle.Turtle.isTurtle()) {
			handle.write("This is not a turtle!");
			return false;
		}
		return true;
	}

	private function perform(outcome:Outcome<Noise, String>):Bool {
		switch outcome {
			case Success(_):
				return true;
			case Failure(error):
				handle.write(error);
				return false;
		}
	}
}