package ch.nuth.zhaw.exbox;

/**
 * Provides the functionality to draw a snowflake.
 */
public class SnowflakeServer implements CommandExecutor {
    @Override
    public String execute(String command) {
        int recursionLevel = Integer.parseInt(command);
        Turtle turtle = Turtle.instance();
        drawSnowflake(turtle, recursionLevel);
        return turtle.getTrace();
    }

    public void drawSnowflake(Turtle turtle, int recursionLevel) {
        turtle.reset(0.1, 0.266);
        turtle.turn(60);

        for (int i = 0; i < 3; i++) {
            drawLine(turtle, recursionLevel, 0.8);
            turtle.turn(-120);
        }
    }

    public void drawLine(Turtle turtle, int recursionLevel, double destination) {
        if (recursionLevel == 0) {
            turtle.move(destination);
        } else {
            double distance = destination / 3;

            for (int i = 0; i < 3; i++) {
                drawLine(turtle, recursionLevel - 1, distance);
                turtle.turn(i % 2 == 0 ? 60 : -120);
            }

            drawLine(turtle, recursionLevel - 1, distance);
        }
    }
}