cis 461 h1p2

package hw461;

/***********************************************************
 * Program Assignment #1 (CIS 461, Fall 2016)              *
 * Submitted By: Jason Dorsey, Michael White                      *
 * SID: 0001502537   0001385222                 *
 * Date: 9/29/2017                            *
 ***********************************************************/

/**
 * CIS 461: Formal Methods for Software Engineering
 * FM Radio Demonstration
 * The radio project class: RadioProj.java
 *
 * @author Haiping Xu
 * Revised on Sept. 15, 2016
 **/


import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class RadioProj implements Runnable, ActionListener {
    private final static int freqTop = 108;
    private final static int freqBottom = 88;
    private float frequency = freqTop;
    private double[] lockFrequency = {105.9, 101.8, 98.5, 95.6, 92.1};
    private DisplayPanel display;
    private JButton on;
    private JButton off;
    private JButton scan;
    private JButton reset;
    private volatile Thread searchChannel;

    public void init() {
        JFrame frame = new JFrame("FM Radio");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container pane = frame.getContentPane();

        display=new DisplayPanel("FM Radio");
        pane.add(display, BorderLayout.CENTER);

        JPanel p = new JPanel();
        on = new JButton("on");
        on.addActionListener(this);
        p.add(on);

        off = new JButton("off");
        off.addActionListener(this);
        p.add(off);

        scan = new JButton("scan");
        scan.addActionListener(this);
        p.add(scan);

        reset = new JButton("reset");
        reset.addActionListener(this);
        p.add(reset);

        pane.add(p, BorderLayout.SOUTH);

        frame.pack();
        frame.setSize(350, 300);
        frame.setVisible(true);
    }

    public static void main(String[] argv) {
        RadioProj radio = new RadioProj();
        radio.init();
    }

    private boolean scanner = false;
    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub
        if (e.getActionCommand().equals("on")) {
            display.turnOn();
            frequency =  freqTop;
            display.setValue(frequency);
        }
        else if (e.getActionCommand().equals("off")) {
            display.turnOff();
            // searchChannel.stop(); -- deprecated, do not use
            searchChannel = null;
        }
        else if (e.getActionCommand().equals("scan")) {
            if (display.isOn()) scanning();
        }
        else if (e.getActionCommand().equals("reset")) {
            if (display.isOn()) reset();
        };
    }


    //  ====>>>>> Complete the methods below this line! <<<<<====

    private void scanning() {

        // ==> 1. Add your code here!

        if (!this.scanner) {
            this.searchChannel = new Thread(this);
            this.searchChannel.start();
            this.scanner = true;
        }
        else this.scanner = false;
    }

    private void reset() {
        // ==> 2. Add your code here!
        this.display.setValue(this.frequency);
        this.frequency = (float)108.0;
    }

    @Override
    public void run() {
        // ==> 3. Add your code here!
        while ((this.searchChannel != null) && (this.frequency > freqBottom)) {
            this.frequency -= 0.1;
            this.display.setValue(this.frequency);
            try {
                Thread.sleep(100);
            }
            catch (InterruptedException e) {
                e.printStackTrace();
            }
            int freq = -1;
            for (int x = 0; x < 5; x++)
                if (Math.abs(this.frequency - this.lockFrequency[x]) < 0.01)
                    freq = x;
            if (freq != -1)
                break;
        }
        this.scanner = false;
    }
}