import java.applet.*;
import java.lang.*;
import java.util.*;
import java.awt.*;

// 通貨クラス

class Money extends Object {

    public String name;
    public String country;
    public double rate;

public Money(String n, String c, double r)
{
    name = n; country = c; rate = r;
    return;
}

public Money()
{
    name = ""; country = ""; rate = 0;
    return;
}

}

// 換金クラス

public class Exchange extends Applet {

    int size;
    Font font;
    Hashtable tab;
    Label inlabel, buylabel, outlabel;
    Label inname, buyname, outname;
    TextField incountry, buycountry, outcountry;
    TextField innum, buynum, outnum;
    TextField message;
    Money inmoney, buymoney, outmoney;
    List idlist, idlist2, idlist3;
    Button calc;
    Panel in, buy, out, bottom;

// 初期化処理

public void init()
{
    size = Integer.parseInt(getParameter("size"));
    String str = getParameter("data");
    StringTokenizer strtok = new StringTokenizer(str, ",", false);

    // ハッシュテーブル作成

    tab = new Hashtable;
    idlist = new List(3, false);
    idlist2 = new List(3, false);
    idlist3 = new List(3, false);

    for (int i = 0; i < size; i ++){
	String sid = strtok.nextToken();
	String name = strtok.nextToken();
	String country = strtok.nextToken();
	String srate = strtok.nextToken();
	double rate;
	try {
	    rate = Double.valueOf(srate).doubleValue();
	} catch (NumberFormatException e){
	    rate = 0;
	}

	tab.put(sid, new Money(name, country, rate));
	idlist.addItem(sid+":"+country);
	idlist2.addItem(sid+":"+country);
	idlist3.addItem(sid+":"+country);
    }

    //tab.rehash();

    // GUI 部品配置

    //setBackground(Color.black);
    //setForeground(Color.white);
    font = new Font("TimesRoman", Font.BOLD, 16);

    inlabel = new Label("Your money");
    inlabel.setFont(font);
    inname = new Label("               ");
    inname.setFont(font);
    incountry = new TextField(20);
    incountry.setEditable(false);
    incountry.setFont(font);
    innum = new TextField(10);
    innum.setEditable(true);
    innum.setFont(font);

    buylabel = new Label("A price");
    buylabel.setFont(font);
    buyname = new Label("               ");
    buyname.setFont(font);
    buycountry = new TextField(20);
    buycountry.setEditable(false);
    buycountry.setFont(font);
    buynum = new TextField(10);
    buynum.setEditable(true);
    buynum.setFont(font);

    outlabel = new Label("Change");
    outlabel.setFont(font);
    outname = new Label("               ");
    outname.setFont(font);
    outcountry = new TextField(20);
    outcountry.setEditable(false);
    outcountry.setFont(font);
    outnum = new TextField(10);
    outnum.setEditable(false);
    outnum.setFont(font);

    in = new Panel();
    //in.setLayout(new GridLayout(1, 3));
    in.add(idlist);
    //in.add(incountry);
    in.add(innum);
    in.add(inname);

    buy = new Panel();
    buy.add(idlist2);
    //buy.add(buycountry);
    buy.add(buynum);
    buy.add(buyname);

    out = new Panel();
    out.add(idlist3);
    //out.add(outcountry);
    out.add(outnum);
    out.add(outname);

    message = new TextField(30);
    message.setEditable(false);
    message.setFont(font);

    calc = new Button("Calc");
    calc.setFont(new Font("TimesRoman", Font.BOLD, 24));

    bottom = new Panel();
    bottom.add(message);
    bottom.add(calc);

    setLayout(new GridLayout(7, 1));
    add(inlabel);
    add(in);
    add(buylabel);
    add(buy);
    add(outlabel);
    add(out);
    add(bottom);
}

// イベント処理

public boolean action(Event evt, Object what)
{
    if (evt.target instanceof List){
	calculate();
    } else if (evt.target instanceof Button){
	if (((String)what).equals("Calc")) {
	    calculate();
	}
    }
    return true;
}

// 数値計算処理

protected void calculate()
{
    String item = idlist.getSelectedItem();
    if (item == null){
	inname.setText("Please Select");
	inmoney = null;
    } else {
	inmoney = (Money)tab.get(item.substring(0, 3));
	inname.setText(inmoney.name);
    }

    item = idlist2.getSelectedItem();
    if (item == null){
	buyname.setText("Please Select");
	buymoney = null;
    } else {
	buymoney = (Money)tab.get(item.substring(0, 3));
	buyname.setText(buymoney.name);
    }

    item = idlist3.getSelectedItem();
    if (item == null){
	outname.setText("Please Select");
	outmoney = null;
    } else {
	outmoney = (Money)tab.get(item.substring(0, 3));
	outname.setText(outmoney.name);
    }

    if (inmoney == null || buymoney == null || outmoney == null){
	outnum.setText("");
	message.setText("");
	return;
    }

    double nin, nbuy, nout;
    try {
	nin = Double.valueOf(innum.getText()).doubleValue();
    } catch (NumberFormatException e) {nin = 0;}
    try {
	nbuy = Double.valueOf(buynum.getText()).doubleValue();
    } catch (NumberFormatException e) {nbuy = 0;}

    nout = (nin / inmoney.rate) - (nbuy / buymoney.rate);

    outnum.setText(String.valueOf(nout * outmoney.rate));

    if (nout < 0){
	message.setText("Too much shopping!!");
    } else if (nout < 5){
	message.setText("Nice shopping.");
    } else {
	message.setText("You can buy something more.");
    }

    return;
}

}