package net.sourceforge.phpdt.internal.ui.text.template;

import net.sourceforge.phpdt.internal.ui.PHPUiImages;
import net.sourceforge.phpdt.internal.ui.text.link.LinkedPositionManager;
import net.sourceforge.phpdt.internal.ui.text.link.LinkedPositionUI;
import net.sourceforge.phpeclipse.PHPeclipsePlugin;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.contentassist.IContextInformation;
import org.eclipse.swt.graphics.Image;

/**
 * A PHP local identifier proposal.
 */
public class LocalVariableProposal extends AbstractProposal {

  private final String fIdentifierName;
  private final IRegion fRegion;
  private int fRelevance;

  /**
   * Creates a template proposal with a template and its context.
   * @param template
   *          the template
   * @param image
   *          the icon of the proposal.
   */
  public LocalVariableProposal(String identifierName, IRegion region, ITextViewer viewer) {
    super(viewer);
    fIdentifierName = identifierName;
    fRegion = region;
    fRelevance = 99;
  }

  /*
   * @see ICompletionProposal#apply(IDocument)
   */
  public void apply(IDocument document) {
    try {
      //		    if (fTemplateBuffer == null)
      //				fTemplateBuffer= fContext.evaluate(fTemplate);

      int start = fRegion.getOffset();
      int end = fRegion.getOffset() + fRegion.getLength();

      document.replace(start, end - start, fIdentifierName);

      // translate positions
      LinkedPositionManager manager = new LinkedPositionManager(document);

      LinkedPositionUI editor = new LinkedPositionUI(fViewer, manager);
      editor.setFinalCaretOffset(fIdentifierName.length() + start);
      editor.enter();

      fSelectedRegion = editor.getSelectedRegion();

    } catch (BadLocationException e) {
      PHPeclipsePlugin.log(e);
      openErrorDialog(e);

    }
    //      catch (CoreException e) {
    //			handleException(e);
    //	    }
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Object#equals(java.lang.Object)
   */
  public boolean equals(Object obj) {
    if (obj instanceof LocalVariableProposal) {
      return fIdentifierName.equals(((LocalVariableProposal) obj).fIdentifierName);
    }
    return false;
  }

  /*
   * @see ICompletionProposal#getAdditionalProposalInfo()
   */
  public String getAdditionalProposalInfo() {
    StringBuffer hoverInfoBuffer = new StringBuffer();
    //    String workspaceLocation = PHPeclipsePlugin.getWorkspace().getRoot().getLocation().toString();
//    String workspaceLocation;
//    if (fProject != null) {
//      workspaceLocation = fProject.getLocation().toString() + '/';
//    } else {
//      // should never happen?
//      workspaceLocation = PHPeclipsePlugin.getWorkspace().getRoot().getLocation().toString();
//    }
    hoverInfoBuffer.append("local variable -");
    hoverInfoBuffer.append(fIdentifierName);
    return hoverInfoBuffer.toString();
  }

  /*
   * @see ICompletionProposal#getContextInformation()
   */
  public IContextInformation getContextInformation() {
    return null;
  }

  /*
   * @see ICompletionProposal#getDisplayString()
   */
  public String getDisplayString() {
    return fIdentifierName; // $NON-NLS-1$ //$NON-NLS-1$
  }

  /*
   * @see ICompletionProposal#getImage()
   */
  public Image getImage() {
    return PHPUiImages.get(PHPUiImages.IMG_VAR);
  }

  /*
   * @see IJavaCompletionProposal#getRelevance()
   */
  public int getRelevance() {
    return fRelevance;
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Object#hashCode()
   */
  public int hashCode() {
    return fIdentifierName.hashCode();
  }
  /**
   * @param relevance The relevance to set.
   */
  public void setRelevance(int relevance) {
    fRelevance = relevance;
  }
}