package net.sourceforge.phpeclipse.wiki.actions.httpquery;

import java.net.URL;
import java.text.BreakIterator;

import net.sourceforge.phpeclipse.webbrowser.views.BrowserView;

import org.eclipse.jface.action.IAction;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.ui.IEditorActionDelegate;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.texteditor.IDocumentProvider;
import org.eclipse.ui.texteditor.ITextEditor;

public abstract class AbstractHTTPQueryAction implements IEditorActionDelegate {

  private IEditorPart targetEditor;

  public AbstractHTTPQueryAction() {
    super();
  }

  public void setActiveEditor(IAction action, IEditorPart targetEditor) {
    this.targetEditor = targetEditor;
  }

  abstract protected String getUrl(String selection);

  public void run(IAction action) {
    String selection = findSelectedText();
    if (selection != null && selection.trim().length() > 0) {
      URL url;
      IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
      if (window != null) {
        IWorkbenchPage page = window.getActivePage();
        try {
          IViewPart part = page.findView(BrowserView.ID_BROWSER);
          if (part == null) {
            part = page.showView(BrowserView.ID_BROWSER);
          } else {
              page.bringToTop(part);
          }
          String urlStr = getUrl(selection);
          if (urlStr != null && !urlStr.equals("")) {
            ((BrowserView) part).setUrl(urlStr);
          }
        } catch (Exception e) {
        }
      }
    }
  }

  public void selectionChanged(IAction action, ISelection selection) {
  }

  protected String findSelectedText() {
    String selectedText = null;
    ITextSelection textSelection = (ITextSelection) targetEditor.getEditorSite().getSelectionProvider().getSelection();

    selectedText = textSelection.getText();
    if (selectedText == null || selectedText.trim().length() == 0) {
      selectedText = findWord(textSelection);
    }
    return selectedText;
  }

  private String findWord(ITextSelection textSelection) {
    IDocumentProvider documentProvider = ((ITextEditor) targetEditor).getDocumentProvider();
    IDocument document = documentProvider.getDocument(targetEditor.getEditorInput());
    int caretPosition = textSelection.getOffset();
    try {
      IRegion line = document.getLineInformation(document.getLineOfOffset(caretPosition));
      String currentLine = document.get(line.getOffset(), line.getLength());
      int positionInLine = caretPosition - line.getOffset();
      return findWordAt(positionInLine, currentLine);
    } catch (Exception e) {
    }
    return null;
  }

  private String findWordAt(int pos, String source) {
    BreakIterator boundary = BreakIterator.getWordInstance();
    boundary.setText(source);
    int end = boundary.following(pos);
    int start = boundary.previous();
    return source.substring(start, end);
  }

}