#format java
/**
 * StatePattern example
 */

import java.awt.*;
import java.awt.event.*;

interface State {
    public abstract void doClock(Context context, int hour);
    public abstract void doUse(Context context);
    public abstract void doAlarm(Context context);
    public abstract void doPhone(Context context);
}

class DayState implements State {
    private static DayState singleton = new DayState();
    private DayState() {
    }
    public static State getInstance() {   // SingletonPattern
        return singleton;
    }
    public void doClock(Context context, int hour) { // time setting
        if(hour < 9 || 17 <= hour) {
            context.changeState(NightState.getInstance());
        }
    }
    public void doUse(Context context) {
        context.recordLog("safe using (day)");
    }
    public void doAlarm(Context context) {
        context.callSecurityCenter("alarm (day)");
    }
    public void doPhone(Context context) {
        context.callSecurityCenter("phone (day)");
    }
    public String toString() {
        return "[day]";
    }
}

class NightState implements State {
    private static NightState singleton = new NightState();
    private NightState() {
    }
    public static State getInstance() {
        return singleton;
    }
    public void doClock(Context context, int hour) {
        if(9 <= hour && hour < 17) {
            context.changeState(DayState.getInstance());
        }
    }
    public void doUse(Context context) {
        context.callSecurityCenter("emergency... Night safe use");
    }
    public void doAlarm(Context context) {
        context.callSecurityCenter("emergency bell... (Night)");
    }
    public void doPhone(Context context) {
        context.recordLog("recording night phone");
    }
    public String toString() {
        return "[night]";
    }
}

interface Context {
    public abstract void setClock(int hour);
    public abstract void changeState(State state);
    public abstract void callSecurityCenter(String msg);
    public abstract void recordLog(String msg);
}

class SafeFrame extends Frame implements ActionListener, Context {
    private TextField textClock = new TextField(60);
    private TextArea textScreen = new TextArea(10, 60);
    private Button buttonUse = new Button("Using safe");
    private Button buttonAlarm = new Button("Alarm");
    private Button buttonPhone = new Button("Phone");
    private Button buttonExit = new Button("Exit");

    private State state = DayState.getInstance();

    public SafeFrame(String title) {
        super(title);
        setBackground(Color.lightGray);
        setLayout(new BorderLayout());

        add(textClock, BorderLayout.NORTH);
        textClock.setEditable(false);
        add(textScreen, BorderLayout.CENTER);
        textScreen.setEditable(false);

        Panel panel = new Panel();
        panel.add(buttonUse);
        panel.add(buttonAlarm);
        panel.add(buttonPhone);
        panel.add(buttonExit);
        add(panel, BorderLayout.SOUTH);
        pack();
        show();

        buttonUse.addActionListener(this);
        buttonAlarm.addActionListener(this);
        buttonPhone.addActionListener(this);
        buttonExit.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e) {
        System.out.println(""+e);
        if(e.getSource() == buttonUse) {
            state.doUse(this);
        } else if(e.getSource() == buttonAlarm) {
            state.doAlarm(this);
        } else if(e.getSource() == buttonPhone) {
            state.doPhone(this);
        } else if(e.getSource() == buttonExit) {
            System.exit(0);
        } else {
            System.out.println("?");
        }
    }

    public void setClock(int hour) {
        String clockstring = "current time is ";
        if(hour < 10) {
            clockstring += "0"+hour+":00";
        } else {
            clockstring += hour + ":00";
        }
        System.out.println(clockstring);
        textClock.setText(clockstring);
        state.doClock(this, hour);
    }
    public void changeState(State state) {
        System.out.println("from "+this.state+" to "+state);
        this.state = state;
    }
    public void callSecurityCenter(String msg) {
        textScreen.append("call! "+msg+"\n");
    }
    public void recordLog(String msg) {
        textScreen.append("record... "+msg+"\n");
    }
}

public class StateSafe {
    public static void main(String[] args) {
        SafeFrame frame = new SafeFrame("State Sample");
        while(true) {
            for(int hour=0; hour < 24; hour++) {
                frame.setClock(hour);
                try {
                    Thread.sleep(1000);
                } catch(InterruptedException e) {
                }
            }
        }
    }
}