// Project: Observer
// Module: casino
// Source code file: SlotMachine.java.
// The Manager object is the observer.
// The SlotMachine objects are the observables.

import it313.util.Observable;
import java.util.Random;
public class SlotMachine extends Observable {
    private final int NUM_REELS = 3;
    private final String WINNING_SYMBOLS = "|7|7|7|";
    private String[ ] symbols = {"7", "$", "?", "+", "apple",
            "bar", "bell", "cash", "cent", "cherries",
            "diamond", "grapes", "heart", "horseshoe", "lemon",
            "orange", "plum", "pound", "watermelon", "win"};

    private int machineId;
    private String lastPlay;
    private int[ ] lastIndex = new int[NUM_REELS];
    private Random r = new Random( );

    public SlotMachine(int theId) {
        machineId = theId;
        play( );
    }

    public void play( ) {
        String result = "|";
        for(int i = 0; i < NUM_REELS; i++) {
            int numSymbols = symbols.length;
            int index = r.nextInt(numSymbols);
            lastIndex[i] = index;
            result += symbols[index] + "|";
        }
        lastPlay = result;
        if (isJackpot( )) {
            setChanged( );
            notifyObservers(machineId);
        }
    }

    public boolean isJackpot( ) {
        return lastPlay.equals(WINNING_SYMBOLS);
    }

    @Override
    public String toString( ) {
        return String.format("Machine ID: %d Last Play: %s",
                machineId, lastPlay);
    }
}