package itm225_proj4;

import javax.swing.*;
import java.awt.*;

public class RocketDisplay extends JApplet {

    Rocket rocket; //the rocket to draw
    TakeOffText takeoff; // the take off text to draw

    ReadyState readystate; //the state of the rocket's launch procedure: either READY, NOT_READY, OR COUNTING

    //The distance to move the rocket each frame
    final int OFFSET = 2;

    //the starting position of the rocket
    final int STARTPOSITION = 550-OFFSET;

    //enum used to specify state of the rocket's launch procedure: see above
    public enum ReadyState {
        NOT_READY, READY, COUNTING;
    }

    /*this is the method that is called when the applet is first loaded.
     * it initializes any variables needed by paint() then starts a new thread
     */
    @Override
    public void init() {
        rocket = new Rocket(STARTPOSITION);
        takeoff = new TakeOffText();
        readystate = ReadyState.NOT_READY;
        /*to start a thread you have to give a new thread's constructor an object
         *of type "Runnable." Since Runnable is an interface you have to implement it
         * see the implementation class below
         */

        (new Thread(new Runner())).start();
    }

    /*This method is used by the event dispatcher thread when an event triggers
     * a window repaint
     *
     */
    @Override
    public void paint(Graphics g) {

        //Stuff that always happens first
        rocket.erase(g);


        //Stuff that might not happen
        switch (readystate) {
            case NOT_READY:
                LaunchPad.paint(g); //only draw launchpad at initial state
                break;
            case READY:
                rocket.moveRocketUp(OFFSET);//only move rocket when rocket is ready to be launched
                break;
            case COUNTING:
                takeoff.paint(g); //only draw take off text when countdown is still running
                break;

        }

        //Stuff that always happens last


        rocket.paint(g);


    }

    /*
     * This class contains a run method which is invoked upon creation of new threads
     * using objects from this class
     */
    class Runner implements Runnable {


        public void run() {

            /* Draw the rocket and launch pad */
            repaint();

            //Ask user if they would like to launch the rocket
            int input = JOptionPane.showConfirmDialog(null, "Would you like to launch the rocket?", "Entery Yes/No", JOptionPane.YES_NO_OPTION);

            //Exit if they say no
            if (input != 0)
                System.exit(0);


                //change ready state to counting so that paint method will draw take off text when called
                readystate = ReadyState.COUNTING;

                //loop until take off text's boolean method ready() returns false i.e. the countdown has reached "take off"
                while (!takeoff.ready()) {
                    repaint(); //draw take off text

                    try {
                        //wait 1 second before looping or continuing
                        Thread.sleep(1000);
                    } catch (InterruptedException ex) {

                    }
                }

                //change ready state to ready so that paint method will move the rocket when called
                readystate = ReadyState.READY;

                //loop until rocket is off the screen
                while(!rocket.isOffScreen()) {

                    //paint the rocket at new location
                    repaint();


                    try {
                        //wait 24 milliseconds before drawing next frame
                        Thread.sleep(24);
                    } catch (InterruptedException ex) {

                    }
                }

                //rocket has completely launched

                //set rocket to original state (at launchpad)
                rocket = new Rocket(STARTPOSITION);
                //set take off text to original state (countdown at 5)
                takeoff = new TakeOffText();

                //set ready state to not_ready so that paint will draw rocket at current position without moving it
                readystate = ReadyState.NOT_READY;

                //start a new thread just like this one, but at the beginning
                (new Thread(new Runner())).start();

                //this thread ends.

        }

    }



}