package KarelChallenges;
import kareltherobot.*;

/**
 * Sebastian Stephens
 * This program has Karel move down a path of beepers by checking each side for one.
 */
public class Challenge3Main extends Robot{

    /**
     * Constructor for Challenge3Main Class
     * @param a
     * @param s
     * @param d
     * @param b
     * @ return - none
     */
    public Challenge3Main (int a, int s, Direction d, int b) {
        super(a, s, d, b);
    }

    public static void main(String[] args){
        World.setDelay(10);
        World.setVisible();
        World.readWorld("KarelChallenges3.kwld");
        //Creates new Challenge3Main object
        Challenge3Main gary = new Challenge3Main(1,1,North, -1);
        //Has gary run masterCheckForBeep method
        gary.masterCheckForBeep();
    }


    /**
     * Checks to see if there is a beeper on each side
     * @ param - none
     * @ return - none
     */
    public void masterCheckForBeep(){
        //Sets a boolean variable to true and has a while toop that runs while it is true
        boolean x = true;
        while(x = true){
            //If one of these conditions is true this code rune
            if(lookUp() || lookLeft() || lookDown() || lookRight() ){
                //Picks beeper robot is on so path doesnt mess up
                pickBeeper();
                //If there is still a beeper the loop ends and so does the program
                //This is because there are two beepers on the last space
                if(nextToABeeper()){
                    pickBeeper();
                    turnOff();
                    x = false;
                }
            }

        }
    }

    /**
     * Checks to see if there is a beeper above the space where robot is located
     * @ param - none
     * @return
     */
    public boolean lookUp() {
        //Checks to see if there is wall in front of it
        if(frontIsClear()) {
            //Moves north and then checks for beeper
            move();
            //If it is next to beeper it returns true and robot stays there facing north
            if (nextToABeeper()) {
                return true;
            }
            //If it is not next to beeper it moves back to the previous space and resets position by facing north
            //Then returns false
            else {
                turnLeft();
                turnLeft();
                move();
                turnLeft();
                turnLeft();
                return false;
            }
        }
        //Nothing runs if there is a wall
        else{
            return false;
        }

    }

    /**
     * Checks to see if there is a beeper in the space below where the robot is located
     * @ param - none
     * @return
     */
    public boolean lookDown(){
        //Turns around and checks to see if front is clear to make sure there is no wall
        turnLeft();
        turnLeft();
        if(frontIsClear()) {
            //If there is no wall it moves and checks for a beeper
            move();
            //If there is beeper it resets position by facing north
            //Returns true
            if (nextToABeeper()) {
                turnLeft();
                turnLeft();
                return true;

            }
            //If there is no beeper then robot turns around and moves up to previous position
            //Returns false
            else {
                turnLeft();
                turnLeft();
                move();
                return false;
            }
        }
        //Does not run if there is wall
        else{
            return false;
        }

    }

    /**
     * Checks to see if there is a beeper to the left of the robot
     * @ param - none
     * @return
     */
    public boolean lookLeft(){
        //Faces left and checks if there is a wall
        turnLeft();
        if(frontIsClear()) {
            //Moves forward and checks if there is a beeper
            move();
            //If there it is a beeper robot turns right and method returns true
            if (nextToABeeper()) {
                turnRight();
                return true;
            }
            //If there is no beeper it turns around moves and resets position in previous spot
            //Then returns false
            else {
                turnRight();
                turnRight();
                move();
                turnLeft();
                return false;
            }
        }
        //Does not run if there is a wall
        else{
            return false;
        }
    }

    /**
     * Checks to see if right has beeper
     * @ param - none
     * @return
     */
    public boolean lookRight(){
        //Robot faces right
        turnRight();
        //Checks to see if the front is clear
        if(frontIsClear()) {
            //If front is clear robot moves forward and checks for beeper
            move();
            //If there is a beeper it turns left to reset position north
            //Returns true
            if (nextToABeeper()) {
                turnLeft();
                return true;
            }
            //If there is no beeper robot turns around a moves back and faces north
            //Returns false
            else {
                turnLeft();
                turnLeft();
                move();
                turnRight();
                return false;
            }
        }
        //If there is wall then nothing runs
        else{
            return false;
        }
    }
    
    /**
     * Allows gary to turn right
     * @ param - none
     * @ return - void
     */
    public void turnRight(){
        int delay = World.delay();
        World.setDelay(0);
        turnLeft();
        turnLeft();
        World.setDelay(delay);
        turnLeft();
    }


}