package ij.macro;
import ij.*;
import ij.plugin.*;
import ij.plugin.frame.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Hashtable;
import java.util.Arrays;
import java.util.Iterator;
import java.util.Set;

/** This class implements the text editor's Macros/Find Functions command.
    It was written by jerome.mutterer at ibmp.fr, and is based on Mark Longair's CommandFinder plugin.
*/
public class FunctionFinder implements TextListener,  WindowListener, KeyListener, ItemListener, ActionListener {
    private static Dialog dialog;
    private TextField prompt;
    private List functions;
    private Button insertButton, infoButton, closeButton;
    private String [] commands;
    private Editor editor;
    
    public FunctionFinder(Editor editor) {
        
        this.editor = editor;
        
        String exists = IJ.runMacro("return File.exists(getDirectory('macros')+'functions.html');");
        if (exists=="0")    {
            String installLocalMacroFunctionsFile = "functions = File.openUrlAsString('"+IJ.URL+"/developer/macro/functions.html');\n"+
            "f = File.open(getDirectory('macros')+'functions.html');\n"+
            "print (f, functions);\n"+
            "File.close(f);";
            try { IJ.runMacro(installLocalMacroFunctionsFile);
            } catch (Throwable e) { IJ.error("Problem downloading functions.html"); return;}
        }
        String f = IJ.runMacro("return File.openAsString(getDirectory('macros')+'functions.html');");
        String [] l = f.split("\n");
        commands= new String [l.length];
        int c=0;
        for (int i=0; i<l.length; i++) {
            String line = l[i];
            if (line.startsWith("<b>")) {
                commands[c]=line.substring(line.indexOf("<b>")+3,line.indexOf("</b>"));
                c++;
            }
        }
        if (c==0) {
            IJ.error("ImageJ/macros/functions.html is corrupted");
            return;
        }
        
        ImageJ imageJ = IJ.getInstance();
        if (dialog==null) {
            dialog = new Dialog(imageJ, "Built-in Functions");
            dialog.setLayout(new BorderLayout());
            dialog.addWindowListener(this);
            Panel northPanel = new Panel();
            prompt = new TextField("", 32);
            prompt.addTextListener(this);
            prompt.addKeyListener(this);
            northPanel.add(prompt);
            dialog.add(northPanel, BorderLayout.NORTH);
            functions = new List(12);
            functions.addKeyListener(this);
            populateList("");
            dialog.add(functions, BorderLayout.CENTER);
            Panel buttonPanel = new Panel();
            insertButton = new Button("Insert");
            insertButton.addActionListener(this);
            buttonPanel.add(insertButton);
            infoButton = new Button("Info");
            infoButton.addActionListener(this);
            buttonPanel.add(infoButton);
            closeButton = new Button("Close");
            closeButton.addActionListener(this);
            buttonPanel.add(closeButton);
            dialog.add(buttonPanel, BorderLayout.SOUTH);
            dialog.pack();
        }   
        
        Frame frame = WindowManager.getFrontWindow();
        if (frame==null) return;
        java.awt.Point posi=frame.getLocationOnScreen();
        int initialX = (int)posi.getX() + 38;
        int initialY = (int)posi.getY() + 84;
        dialog.setLocation(initialX,initialY);
        dialog.setVisible(true);
        dialog.toFront();
    }
    
    public FunctionFinder() {
        this(null);
    }
    
    public void populateList(String matchingSubstring) {
        String substring = matchingSubstring.toLowerCase();
        functions.removeAll();
        try {
            for(int i=0; i<commands.length; ++i) {
                String commandName = commands[i];
                if (commandName.length()==0)
                    continue;
                String lowerCommandName = commandName.toLowerCase();
                if( lowerCommandName.indexOf(substring) >= 0 ) {
                    functions.add(commands[i]);
                }
            }
        } catch (Exception e){}
    }
    
    public void edPaste(String arg) {
        Frame frame = WindowManager.getFrontWindow();
        if (!(frame instanceof Editor))
            return;
        
        try {
            TextArea ta = ((Editor)frame).getTextArea();
            editor = (Editor)frame;
            int start = ta.getSelectionStart( );
            int end = ta.getSelectionEnd( );
            try {
                ta.replaceRange(arg.substring(0,arg.length()), start, end);
            } catch (Exception e) { }
            if (IJ.isMacOSX())
                ta.setCaretPosition(start+arg.length());
        } catch (Exception e) { }
    }
    
    public void itemStateChanged(ItemEvent ie) {
        populateList(prompt.getText());
    }
    
    protected void runFromLabel(String listLabel) {
        edPaste(listLabel);
        closeAndRefocus();
    }
    
    public void close() {
        closeAndRefocus();
    }
    
    public void closeAndRefocus() {
        if (dialog!=null)
            dialog.dispose();
        if (editor!=null)
            editor.toFront();
    }
    
    public void keyPressed(KeyEvent ke) {
        int key = ke.getKeyCode();
        int items = functions.getItemCount();
        Object source = ke.getSource();
        if (source==prompt) {
            if (key==KeyEvent.VK_ENTER) {
                if (1==items) {
                    String selected = functions.getItem(0);
                    edPaste(selected);
                }
            } else if (key==KeyEvent.VK_UP) {
                functions.requestFocus();
                if(items>0)
                    functions.select(functions.getItemCount()-1);
            } else if (key==KeyEvent.VK_ESCAPE) {
                closeAndRefocus();
            } else if (key==KeyEvent.VK_DOWN)  {
                functions.requestFocus();
                if (items>0)
                    functions.select(0);
            }
        } else if (source==functions) {
            if (key==KeyEvent.VK_ENTER) {
                String selected = functions.getSelectedItem();
                if (selected!=null)
                    edPaste(selected);
            }
            else if (key==KeyEvent.VK_ESCAPE) {
                closeAndRefocus();
            }
        }
    }
    
    public void keyReleased(KeyEvent ke) { }
    
    public void keyTyped(KeyEvent ke) { }
    
    public void textValueChanged(TextEvent te) {
        populateList(prompt.getText());
    }
    
    public void actionPerformed(ActionEvent e) {
        Object b = e.getSource();
        if (b==insertButton) {
            int index = functions.getSelectedIndex();
            if (index>=0) {
                String selected = functions.getItem(index);
                edPaste(selected);
            }
        } else if (b==infoButton) {
            String url = IJ.URL+"/developer/macro/functions.html";
            int index = functions.getSelectedIndex();
            if (index>=0) {
                String selected = functions.getItem(index);
                int index2 = selected.indexOf("(");
                if (index2==-1)
                    index2 = selected.length();
                url = url + "#" + selected.substring(0, index2);
            }
            IJ.runPlugIn("ij.plugin.BrowserLauncher", url);
        } else if (b==closeButton)
        closeAndRefocus();
    }
    
    public void windowClosing(WindowEvent e) {
        closeAndRefocus();
    }
    
    public void windowActivated(WindowEvent e) { }
    public void windowDeactivated(WindowEvent e) { }
    public void windowClosed(WindowEvent e) { }
    public void windowOpened(WindowEvent e) { }
    public void windowIconified(WindowEvent e) { }
    public void windowDeiconified(WindowEvent e) { }
}