/**
 * Moves alphabot forward until there is no wall on the left, then it does a back flip
 * By: Alejandro Antorcha
 */
package Lesson4;
import kareltherobot.*;

public class Activity1Lesson4 extends Robot{

    public Activity1Lesson4(int x, int y, Direction d, int b) {
        super(x, y, d, b);
    }

    public static void main(String[] args) {
        World.readWorld("Lesson4World1.kwld");

        World.setDelay(25);
        World.setVisible();

        Robot alphaBot = new Activity1Lesson4(1, 3, North, 0);

        //runs move() 4 times
        for(int i = 0; i < 4; i++) {
            alphaBot.move();
        }

    }

    /**
     * @Override
     * Moves normally but if it is at the tower, it turns left
     * @param
     * @return void
     */
    public void move() {
        //chooses to either move forward or do a back flip
        if(leftIsClear()) {
            this.backFlip();
        } else {
            super.move();
        }

    }

    /**
     * checks to see if the left is clear
     * @param
     * @return boolean
     */
    public boolean leftIsClear() {
        int delay = World.delay();
        World.setDelay(0);

        //initializes boolean variable clear
        boolean clear;

        //turns left to orient and check
        this.turnLeft();

        //assigns clear to
        clear = this.frontIsClear();

        //orients robot back facing north
        while(!this.facingNorth()) {
            turnLeft();
        }
        //setting the relay to what it was previously set to
        World.setDelay(delay);

        return clear;
    }

    /**
     * makes the robot do a back flip
     * @param
     * @return void
     */
    public void backFlip() {
        for(int i = 0; i < 4; i++) {
            this.turnLeft();
        }
    }
}