package net.sourceforge.phpdt.externaltools.variable;

import net.sourceforge.phpeclipse.externaltools.ExternalToolsPlugin;
import net.sourceforge.phpeclipse.ui.WebUI;

import org.eclipse.core.runtime.IPath;
import org.eclipse.jface.preference.IPreferenceStore;

/**
 * Expands a variable into a localhost/documentRoot URL string 
 * <p>
 * This class is not intended to be extended by clients.
 * </p>
 */
public class UrlExpander extends ResourceExpander { //implements IVariableTextExpander {

  /**
   * Create an instance
   */
  public UrlExpander() {
    super();
  }

  /**
   * Returns a string representation to a localhost/documentRoot URL 
   * for the given variable tag and value or <code>null</code>.
   * 
   * @see IVariableTextExpander#getText(String, String, ExpandVariableContext)
   */
  public String getText(String varTag, String varValue, ExpandVariableContext context) {
    IPath path = getPath(varTag, varValue, context);
    if (path != null) {
      IPreferenceStore store = ExternalToolsPlugin.getDefault().getPreferenceStore();
      String localhostURL = path.toString();
      String lowerCaseFileName = localhostURL.toLowerCase();
      String documentRoot = store.getString(WebUI.PHP_DOCUMENTROOT_PREF);
      documentRoot = documentRoot.replace('\\', '/');
      documentRoot = documentRoot.toLowerCase();

      if (lowerCaseFileName.startsWith(documentRoot)) {
        localhostURL = localhostURL.substring(documentRoot.length());
        localhostURL = store.getString(WebUI.PHP_LOCALHOST_PREF)+ localhostURL;
      }
      return localhostURL;
    }
    return "<no file selected>";
  }

}