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

import net.sourceforge.phpdt.internal.corext.template.TemplateMessages;
import net.sourceforge.phpdt.internal.corext.template.php.JavaContext;
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.ContextInformation;
import org.eclipse.jface.text.contentassist.IContextInformation;
import org.eclipse.jface.text.templates.TemplateContext;
import org.eclipse.swt.graphics.Image;

/**
 * A PHP identifier proposal.
 */
public class IdentifierProposal extends AbstractProposal {
  private final TemplateContext fContext;

  private final Image fImage_fun;
  private final Image fImage_var;
  //private TemplateBuffer fTemplateBuffer;
  private String fOldText;
  private final IRegion fRegion;
  //  private IRegion fSelectedRegion; // initialized by apply()
  private final String fTemplate;

  public IdentifierProposal(String template, TemplateContext context,
      IRegion region, ITextViewer viewer, Image image_fun, Image image_var) {
    super(viewer);
    fTemplate = template;
    fContext = context;

    //    fViewer = viewer;
    fImage_fun = image_fun;
    fImage_var = image_var;
    fRegion = region;
  }

  public void apply(IDocument document) {
    try {
      int start = fRegion.getOffset();
      int end = fRegion.getOffset() + fRegion.getLength();
      document.replace(start, end - start, fTemplate);
      // translate positions
      LinkedPositionManager manager = new LinkedPositionManager(document);

      LinkedPositionUI editor = new LinkedPositionUI(fViewer, manager);
      editor.setFinalCaretOffset(fTemplate.length() + start);
      //   editor.setFinalCaretOffset(getCaretOffset(fTemplateBuffer) + start);
      editor.enter();
      fSelectedRegion = editor.getSelectedRegion();
    } catch (BadLocationException e) {
      PHPeclipsePlugin.log(e);
      openErrorDialog(e);
    }
  }
  /*
   * @see ICompletionProposal#getAdditionalProposalInfo()
   */
  public String getAdditionalProposalInfo() {
    return textToHTML(fTemplate); // fTemplateBuffer.getString());
  }

  public String getDisplayString() {
    return fTemplate + TemplateMessages.getString("TemplateProposal.delimiter") + fTemplate; // $NON-NLS-1$
  }

  public Image getImage() {
    if (fTemplate.charAt(0) == '$') {
      return fImage_var;
    }
    return fImage_fun;
  }

  public int getRelevance() {
    if (fContext instanceof JavaContext) {
      JavaContext context = (JavaContext) fContext;
      switch (context.getCharacterBeforeStart()) {
        // high relevance after whitespace
        case ' ' :
        case '\r' :
        case '\n' :
        case '\t' :
          return 50;
        default :
          return 0;
      }
    } else {
      return 50;
    }
  }
}