import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;

public class FindEncoding extends Frame
 implements ItemListener,ActionListener {

    String[] strsEncAll = {
        "JIS: JIS",
        "SJIS: PC and Windows Japanese",
        "EUCJIS: Japanese EUC",
        "8859_1: ISO Latin-1",
        "8859_2: ISO Latin 2",
        "8859_3: ISO Latin-3",
        "8859_5: ISO Latin/Cyrillic",
        "8859_6: ISO Latin/Arabic",
        "8859_7: ISO Latin/Greek",
        "8859_8: ISO Latin/Hebrew",
        "8859_9: ISO Latin-5",
        "Cp1250: Windows Eastern Europe / Latin-2",
        "Cp1251: Windows Cyrillic",
        "Cp1252: Windows Western Europe / Latin-1",
        "Cp1253: Windows Greek",
        "Cp1254: Windows Turkish",
        "Cp1255: Windows Hebrew",
        "Cp1256: Windows Arabic",
        "Cp1257: Windows Baltic",
        "Cp1258: Windows Vietnamese",
        "Cp437: PC Original",
        "Cp737: PC Greek",
        "Cp775: PC Baltic",
        "Cp850: PC Latin-1",
        "Cp852: PC Latin-2",
        "Cp855: PC Cyrillic",
        "Cp857: PC Turkish",
        "Cp860: PC Portuguese",
        "Cp861: PC Icelandic",
        "Cp862: PC Hebrew",
        "Cp863: PC Canadian French",
        "Cp864: PC Arabic",
        "Cp865: PC Nordic",
        "Cp866: PC Russian",
        "Cp869: PC Modern Greek",
        "Cp874: Windows Thai",
        "MacArabic: Macintosh Arabic",
        "MacCentralEurope: Macintosh CentralEurope",
        "Macintosh: Latin-2",
        "MacCroatian: Macintosh Croation",
        "MacCyrillic: Macintosh Cyrillic",
        "MacDingbat: Macintosh Dingbat",
        "MacGreek: Macintosh Greek",
        "MacHebrew: Macintosh Hebrew",
        "MacIceland: Macintosh Iceland",
        "MacRoman: Macintosh Roman",
        "MacRomania: Macintosh Romania",
        "MacSymbol: Macintosh Symbol",
        "MacThai: Macintosh Thai",
        "MacTurkish: Macintosh Turkish",
        "MacUkraine: Macintosh Ukraine",
        "UTF8: Standard UTF-8"
    };

    String[] strsEncKey = new String[strsEncAll.length];
    String currentEnc;
    String currentFile;

    TextArea ta = new TextArea(25,80);
    TextField tfFile = new TextField();
    Button btnNewLoad = new Button("new load");
    Button btnReLoad = new Button("reload");
    Button btnQuit = new Button("quit");

    FindEncoding() {
        super("FindEncoding");

        addWindowListener( new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

                    Choice choice = new Choice();
                Panel pChoice = new Panel();
                pChoice.setLayout(new BorderLayout());
                pChoice.add("North",tfFile);
                pChoice.add("Center",choice);
                    btnReLoad.setEnabled(false);
                Panel pControl = new Panel();
                pControl.add(btnNewLoad);
                pControl.add(btnReLoad);
                pControl.add(btnQuit);
            Panel pOther = new Panel();
            pOther.add(pChoice);
            pOther.add(pControl);
        add("North",pOther);
        add("Center",ta);

        ta.setEditable(false);
        tfFile.setEditable(false);

        for (int i=0; i<strsEncAll.length; i++) {
            String line = strsEncAll[i];
            choice.addItem("[" + (i+1) + "] " + line);
            strsEncKey[i] = line.substring(0, line.indexOf(':'));
        }

        currentEnc = strsEncKey[0];

        choice.addItemListener(this);
        btnNewLoad.addActionListener(this);
        btnReLoad.addActionListener(this);
        btnQuit.addActionListener(this);
    }

    //------------------------------------------------------
    // Choice イベント処理
    public void itemStateChanged(ItemEvent ev) {
        /* for test
        ta.setText("DESELECTED: " + ev.DESELECTED + "\n");
        ta.append("ITEM_FIRST: " + ev.ITEM_FIRST + "\n");
        ta.append("ITEM_LAST: " + ev.ITEM_LAST + "\n");
        ta.append("ITEM_STATE_CHANGED: " + ev.ITEM_STATE_CHANGED + "\n");
        ta.append("SELECTED: " + ev.SELECTED + "\n");
        ta.append("getItem(): " + ev.getItem() + "\n");
        ta.append("getItemSelectable(): " + ev.getItemSelectable() + "\n");
        ta.append("getStateChange(): " + ev.getStateChange() + "\n");
        ta.append("paramString() : " + ev.paramString()  + "\n");
        */
        Choice cho = (Choice)ev.getItemSelectable();
        int ix = cho.getSelectedIndex();
        currentEnc = strsEncKey[ix];
    }

    // Button イベント処理
    public void actionPerformed(ActionEvent ev) {

        String label = ev.getActionCommand();
        if (label.equals("quit"))
            System.exit(0);

        if (label.equals("new load")) {
            FileDialog fd = new FileDialog(
                FindEncoding.this,
                "FindEncoding: select file",
                FileDialog.LOAD
            );
            fd.show();
            String fddir  = fd.getDirectory();
            String fdfile = fd.getFile();
            if (fddir == null || fdfile == null)
                return;
            currentFile = fddir + fdfile;
            tfFile.setText(currentFile);
            btnReLoad.setEnabled(true);
        }

        try {
            BufferedReader br = new BufferedReader(
                new InputStreamReader(
                    new FileInputStream(currentFile),
                    currentEnc
                )
            );

            String line;
            ta.setText("");
            while ((line = br.readLine()) != null) {
                ta.append(line + '\n');
            }

            br.close();

        } catch (sun.io.MalformedInputException e) {
            ta.append(e + "\n");
            //e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //------------------------------------------------------
    void start() {
        pack();
        show();
    }

    public static void main(String[] args) {
        FindEncoding fe = new FindEncoding();
        fe.start();
    }
}
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