/**********************************************************************
Copyright (c) 2000, 2002 IBM Corp. and others.
All rights reserved. This program and the accompanying materials
are made available under the terms of the Common Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/cpl-v10.html

Contributors:
    Klaus Hartlage - www.eclipseproject.de
**********************************************************************/
package net.sourceforge.phpeclipse.actions;

import java.util.List;

import net.sourceforge.phpeclipse.PHPeclipsePlugin;
import net.sourceforge.phpeclipse.builder.IdentifierIndexManager;
import net.sourceforge.phpeclipse.builder.PHPIdentifierLocation;
import net.sourceforge.phpeclipse.phpeditor.PHPEditor;
import net.sourceforge.phpeclipse.phpeditor.php.PHPWordExtractor;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.text.TextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.graphics.Point;
import org.eclipse.ui.IEditorActionDelegate;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.actions.ActionDelegate;
import org.eclipse.ui.dialogs.ListSelectionDialog;
import org.eclipse.ui.internal.dialogs.ListContentProvider;

public class PHPOpenDeclarationEditorAction extends ActionDelegate implements IEditorActionDelegate {

  private IWorkbenchWindow fWindow;
  private PHPEditor fEditor;
  private IProject fProject;

  public void dispose() {
  }

  public void init(IWorkbenchWindow window) {
    this.fWindow = window;
  }

  public void selectionChanged(IAction action, ISelection selection) {
    if (!selection.isEmpty()) {
      if (selection instanceof TextSelection) {
        action.setEnabled(true);
      } else if (fWindow.getActivePage() != null && fWindow.getActivePage().getActivePart() != null) {
        //
      }
    }
  }

  public void run(IAction action) {
    if (fEditor == null) {
      IEditorPart targetEditor = fWindow.getActivePage().getActiveEditor();
      if (targetEditor != null && (targetEditor instanceof PHPEditor)) {
        fEditor = (PHPEditor) targetEditor;
      }
    }
    if (fEditor != null) {
      // determine the current Project from a (file-based) Editor
      IFile f = ((IFileEditorInput) fEditor.getEditorInput()).getFile();
      fProject = f.getProject();
      //      System.out.println(fProject.toString());

      ITextSelection selection = (ITextSelection) fEditor.getSelectionProvider().getSelection();
      IDocument doc = fEditor.getDocumentProvider().getDocument(fEditor.getEditorInput());
      int pos = selection.getOffset();
    //  System.out.println(selection.getText());
      String word = getPHPIdentifier(doc, pos);
      //      System.out.println(word);
      if (word != null && !word.equals("")) {
        IdentifierIndexManager indexManager = PHPeclipsePlugin.getDefault().getIndexManager(fProject);
        List list = indexManager.getLocations(word);
        if (list != null && list.size() > 0) {
          String workspaceLocation = PHPeclipsePlugin.getWorkspace().getRoot().getLocation().toString();
          // TODO show all entries of the list in a dialog box
          // at the moment always the first entry will be opened
          if (list.size() > 1) {
            ListSelectionDialog listSelectionDialog =
              new ListSelectionDialog(
                PHPeclipsePlugin.getDefault().getWorkbench().getActiveWorkbenchWindow().getShell(),
                list,
                new ListContentProvider(),
                new LabelProvider(),
                "Select the resources to open.");
            listSelectionDialog.setTitle("Multiple declarations found");
            if (listSelectionDialog.open() == Window.OK) {
              Object[] locations = listSelectionDialog.getResult();
              if (locations != null) {
                try {
                  for (int i = 0; i < locations.length; i++) {
                    PHPIdentifierLocation location = (PHPIdentifierLocation) locations[i];
                    String filename = workspaceLocation + location.getFilename();
                    //					System.out.println(filename);
                    if (location.getOffset() >= 0) {
                      PHPeclipsePlugin.getDefault().openFileAndGotoOffset(filename, location.getOffset(), word.length());
                    } else {
                      PHPeclipsePlugin.getDefault().openFileAndFindString(filename, word);
                    }
                  }
                } catch (CoreException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
                }
              }
            }
          } else {
            try {
              PHPIdentifierLocation location = (PHPIdentifierLocation) list.get(0);
              String filename = workspaceLocation + location.getFilename();
              //					System.out.println(filename);
              if (location.getOffset() >= 0) {
                PHPeclipsePlugin.getDefault().openFileAndGotoOffset(filename, location.getOffset(), word.length());
              } else {
                PHPeclipsePlugin.getDefault().openFileAndFindString(filename, word);
              }
            } catch (CoreException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
            }
          }
        }
      }
    }
  }

  public void setActiveEditor(IAction action, IEditorPart targetEditor) {
    if (targetEditor != null && (targetEditor instanceof PHPEditor)) {
      fEditor = (PHPEditor) targetEditor;
    }
  }

  private String getPHPIdentifier(IDocument doc, int pos) {
    Point word = PHPWordExtractor.findWord(doc, pos);
    if (word != null) {
      try {
        return doc.get(word.x, word.y);
      } catch (BadLocationException e) {
      }
    }
    return "";
  }
}