package net.sourceforge.phpeclipse.wiki.velocity;

import java.text.BreakIterator;

import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.texteditor.IDocumentProvider;
import org.eclipse.ui.texteditor.ITextEditor;

public class EditorText {
  private IEditorPart targetEditor = null;

  String selection = null;

  String text = null;

  public EditorText(IEditorPart targetEditor) {
    this.targetEditor = targetEditor;
  }

  public void clear() {
    selection = null;
    text = null;
  }

  /**
   * @return Returns the selection.
   */
  public String getSelection() {
    if (selection == null) {
      selection = findSelectedText();
      if (selection == null) {
        selection = "";
      }
    }
    return selection;
  }

  /**
   * @param selection
   *          The selection to set.
   */
  public void setSelection(String selection) {
    this.selection = selection;
  }

  /**
   * @return Returns the text.
   */
  public String getText() {
    return text;
  }

  /**
   * @param text
   *          The text to set.
   */
  public void setText(String text) {
    this.text = text;
  }

  public 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);
  }
}