/*
 *                 Sun Public License Notice
 * 
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 * 
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2004 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.modules.web.debug.util;

import java.util.*;

import java.io.*;
import java.net.*;
import javax.swing.*;
import javax.swing.text.*;

import org.openide.ErrorManager;
import org.openide.nodes.*;
import org.openide.filesystems.*;
import org.openide.text.*;
import org.openide.cookies.*;
import org.openide.util.actions.SystemAction;
import org.openide.util.Lookup;
import org.openide.windows.TopComponent;

import org.openide.filesystems.Repository;

import org.netbeans.modules.web.debug.Context;

import org.netbeans.modules.web.api.webmodule.*;
import org.netbeans.modules.j2ee.deployment.impl.projects.*;
import org.netbeans.modules.j2ee.deployment.plugins.api.*;
import org.netbeans.modules.j2ee.deployment.devmodules.api.JSPServletFinder;

import org.netbeans.api.project.*;

import org.netbeans.api.debugger.*;
import org.netbeans.api.debugger.jpda.*;


/**
 *
 * @author Martin Grebac
 */
public class Utils {
    
    /** Logger for web.debug module. */
    private static ErrorManager err = ErrorManager.getDefault().getInstance("org.netbeans.modules.web.debug");   // NOI18N
     
    public static ErrorManager getEM () {
        return err;
    }
    
    public static File getJspFileFromUrl(String url) {
        if (url != null) {
            URI uri = null;
            try {
                uri = new URI(url);
            } catch (Exception e) {};
            if (uri != null) {
                try {
                    File f = new File(uri);
                    if (f != null) {
                        f = FileUtil.normalizeFile(f);
                    }
                    return f;
                } catch (IllegalArgumentException ex) {
                    ErrorManager.getDefault().log(ErrorManager.INFORMATIONAL, url);
                    ErrorManager.getDefault().log(ErrorManager.INFORMATIONAL, ex.toString());
                }
            }
        }
        return null;
    }
    
    public static FileObject getJspFileObjectFromUrl(String url) {
        File f = getJspFileFromUrl(url);
        if (f != null) {
            return FileUtil.toFileObject(f);
        }
        return null;
    }
    
    public static boolean isJsp(String url) {
        FileObject fo = getJspFileObjectFromUrl(url);
        if (fo != null) {
           return "text/x-jsp".equals(fo.getMIMEType());   //NOI18N
        }
        return false;
    }

    public static String getJspName(String url) {
        File f = getJspFileFromUrl(url);
        if (f != null) {
            return f.getName();
        }
        return (url == null) ? null : url.toString();
    }
    
    public static String getServletClass(String url) {
        FileObject fo = getJspFileObjectFromUrl(url);
        if (fo == null) {
            return null;
        }
        JSPServletFinder finder = JSPServletFinder.findJSPServletFinder (fo);
        WebModule wm = WebModule.getWebModule (fo);
        
        String jspRelativePath = FileUtil.getRelativePath(wm.getDocumentBase(), fo);
        String contextPath = wm.getContextPath();

        String servletPath = finder.getServletResourcePath(jspRelativePath);      
        if (servletPath == null) { // we don't have class name, so assume we are debugging tomcat or appsrv
            servletPath = JspNameUtil.getServletResourcePath(contextPath, jspRelativePath);
        }
        if (servletPath != null) {
            servletPath = servletPath.substring(0, servletPath.length()-5); // length of ".java"
            servletPath = servletPath.replace('/', '.'); //NOI18N
        }
        Utils.getEM().log("servlet class: " + servletPath);
        return servletPath;
    }

    public static String getClassFilter(String url) {
        String filter = getServletClass(url);
        if (filter != null) {
            // get package only
            filter = filter.substring(0, filter.lastIndexOf('.')) + ".*"; //NOI18N
        }
        return filter;
    }
    
//    public static String getCompoundClassFilter(String url) {
//
//        FileObject wmfo = getJspFileObjectFromUrl(url);
//        if (wmfo == null) {
//            return null;
//        }
//        WebModule wm = WebModule.getWebModule(wmfo);
//        Enumeration files = wm.getDocumentBase().getChildren(true);
//                        
//        String filter = null; //NOI18N
//        while (files.hasMoreElements()) {
//            FileObject fo = (FileObject)files.nextElement();
//            if (!fo.isFolder() && "text/x-jsp".equals(fo.getMIMEType()) && (fo != null)) {
//                String jspRelPath = FileUtil.getRelativePath(wm.getDocumentBase(), fo);
//                JSPServletFinder finder = JSPServletFinder.findJSPServletFinder(fo);
//                String servletPath = finder.getServletResourcePath(jspRelPath);
//                if ((servletPath != null) && !servletPath.equals("")) {                
//                    servletPath = servletPath.substring(0, servletPath.length()-5); // length of ".java"
//                    servletPath = servletPath.substring(0, servletPath.lastIndexOf('/')); // get package only
//                    if (filter == null) {
//                        filter = servletPath;
//                    } else {
//                        if (!(servletPath.startsWith(filter))) {
//                            while (!servletPath.startsWith(filter)) {
//                                filter = filter.substring(0, filter.lastIndexOf('/'));
//                            }
//                        }
//                    }
//                }
//            }
//        }
//
//        filter = filter.replace('/', '.') + "."; //NOI18N
//        Utils.getEM().log("compound filter: " + filter);
//        return filter;
//    }

    public static String getContextPath(String url) {
        FileObject wmfo = getJspFileObjectFromUrl(url);
        if (wmfo == null) {
            return null;
        }
        WebModule wm = WebModule.getWebModule(wmfo);        
        if (wm != null) {
            return wm.getContextPath();
        }
        return null;   
    }
        
    /** 
     * Returns current editor component instance.
     *
     * @return current editor component instance
     */
    public static EditorCookie getCurrentEditorCookie () {
        Node[] nodes = TopComponent.getRegistry ().getCurrentNodes();
        if ( (nodes == null) ||
             (nodes.length != 1) ) return null;
        Node n = nodes [0];
        return (EditorCookie) n.getCookie (
            EditorCookie.class
        );
    }
    
    public static JEditorPane getCurrentEditor () {
        EditorCookie e = getCurrentEditorCookie ();
        if (e == null) {
            return null;
        }
        return getCurrentEditor(e);
    }    
    
    /** 
     * Returns current editor component instance.
     *
     * @return current editor component instance
     */
    public static JEditorPane getCurrentEditor (EditorCookie e) {
        JEditorPane[] op = e.getOpenedPanes ();
        if ((op == null) || (op.length < 1)) return null;
        return op [0];
    }
        
    public static String getJavaIdentifier(StyledDocument doc, JEditorPane ep, int offset) {        
        String t = null;
        if ( (ep.getSelectionStart() <= offset) && (offset <= ep.getSelectionEnd())) {
            t = ep.getSelectedText();
        }
        if (t != null) {
            return t;
        }
        int line = NbDocument.findLineNumber(doc, offset);
        int col = NbDocument.findLineColumn(doc, offset);
        try {
            javax.swing.text.Element lineElem = 
                org.openide.text.NbDocument.findLineRootElement(doc).
                getElement(line);
            if (lineElem == null) {
                return null;
            }
            int lineStartOffset = lineElem.getStartOffset();
            int lineLen = lineElem.getEndOffset() - lineStartOffset;
            t = doc.getText (lineStartOffset, lineLen);
            int identStart = col;
            while (identStart > 0 && 
                (Character.isJavaIdentifierPart (
                    t.charAt (identStart - 1)
                ) ||
                (t.charAt (identStart - 1) == '.'))) {
                identStart--;
            }
            int identEnd = col;
            while (identEnd < lineLen && Character.isJavaIdentifierPart(t.charAt(identEnd))) {
                identEnd++;
            }
            if (identStart == identEnd) {
                return null;
            }
            return t.substring (identStart, identEnd);
        } catch (javax.swing.text.BadLocationException e) {
            return null;
        }
    }    

    public static boolean isScriptlet(StyledDocument doc, JEditorPane ep, int offset) {
        String t;
        int line = NbDocument.findLineNumber(doc, offset);
        int col = NbDocument.findLineColumn(doc, offset);
        try {
            while (line > 0) {
                javax.swing.text.Element lineElem = 
                    org.openide.text.NbDocument.findLineRootElement(doc).getElement(line);
                if (lineElem == null) {
                    continue;
                }
                int lineStartOffset = lineElem.getStartOffset();
                int lineLen = lineElem.getEndOffset() - lineStartOffset;
                t = doc.getText (lineStartOffset, lineLen);
                if ((t != null) && (t.length() > 1)) {
                    int identStart;
                    if (line == NbDocument.findLineNumber(doc, offset)) {
                        identStart = col;
                    } else {
                        identStart = lineLen-1;
                    }
                    while (identStart > 0) {
                        if ((t.charAt(identStart) == '%') && (t.charAt(identStart-1) == '<')) {
                            return true;
                        }
                        if ((t.charAt(identStart) == '>') && (t.charAt(identStart-1) == '%')) {
                            return false;
                        }                    
                        identStart--;
                    }
                }
                line--;
            }
        } catch (javax.swing.text.BadLocationException e) {
        }
        return false;
    }        
    
    public static String getELIdentifier(StyledDocument doc, JEditorPane ep, int offset) {
        String t = null;
        if ( (ep.getSelectionStart () <= offset) &&
             (offset <= ep.getSelectionEnd ())
        )   t = ep.getSelectedText ();
        if (t != null) {
            if ((t.startsWith("$")) && (t.endsWith("}"))) {
                return t;
            } else {
                return null;
            }
        }
        
        int line = NbDocument.findLineNumber(doc, offset);
        int col = NbDocument.findLineColumn(doc, offset);
        try {
            javax.swing.text.Element lineElem = 
                org.openide.text.NbDocument.findLineRootElement (doc).
                getElement (line);

            if (lineElem == null) {
                return null;
            }
            int lineStartOffset = lineElem.getStartOffset ();
            int lineLen = lineElem.getEndOffset() - lineStartOffset;
            t = doc.getText (lineStartOffset, lineLen);
            int identStart = col;
            while (identStart > 0 && (t.charAt(identStart) != '$')) {
                identStart--;
            }
            if ((identStart > 0) && (t.charAt(identStart) == '$') && (t.charAt(identStart-1) == '\\')) {
                return null;
            }
            int identEnd = col;
            while ((identEnd < lineLen) && identEnd > 0 && identEnd <= t.length() && (t.charAt(identEnd-1) != '}'))  {
                identEnd++;
            }
            if (identStart == identEnd) {
                return null;
            }
            String outp = t.substring(identStart, identEnd);
            if ((outp.startsWith("$")) && (outp.endsWith("}"))) {
                return outp;
            } else {            
                return null;
            }
        } catch (javax.swing.text.BadLocationException e) {
            return null;
        }
    }
    
    public static String getJavaIdentifier () {
        EditorCookie e = getCurrentEditorCookie ();
        if (e == null) {
            return null;
        }
        JEditorPane ep = getCurrentEditor (e);
        if (ep == null) {
            return null;
        }
        return getJavaIdentifier (
            e.getDocument (),
            ep,
            ep.getCaret ().getDot ()
        );
    }

//    public static String getELIdentifier () {
//        EditorCookie e = getCurrentEditorCookie ();
//        if (e == null) {
//            return null;
//        }
//        JEditorPane ep = getCurrentEditor (e);
//        if (ep == null) {
//            return null;
//        }
//        return getELIdentifier (
//            e.getDocument (),
//            ep,
//            ep.getCaret ().getDot ()
//        );
//    }

    public static boolean isScriptlet() {
        EditorCookie e = getCurrentEditorCookie ();
        if (e == null) {
            return false;
        }
        JEditorPane ep = getCurrentEditor (e);
        if (ep == null) {
            return false;
        }
        return isScriptlet(
            e.getDocument (),
            ep,
            ep.getCaret ().getDot ()
        );
    }
  
    
    
}