#include <vector>
#include "xmlToolDir.hh"
#include "ExpatInterface/Element.h"

// See comments in the include file.

namespace xmlTool {

Directory::Directory(const xml::Element & elt,
			const std::string & tag,
			const std::string & attName) 
  : _elt(elt), _tag(tag), _attName(attName) {
  _cwd.push_back(&elt);
}

const xml::Element & Directory::getCurDirElt() const {
  return **(  _cwd.end()-1   );
}

const std::string Directory::getCurDirName() const {
  const xml::Element & curDirElt = this->getCurDirElt();
  return ( (&curDirElt != &_elt)?curDirElt[this->_attName]:string("/") );
}

const std::vector<std::string> Directory::getDirNames() const {
  std::vector<std::string> dirs;
  
  const xml::Element & curDirElt = this->getCurDirElt();
  for(xml::Element::ElementCollection::const_iterator it 
	= curDirElt.getChildren().begin(); 
      it != curDirElt.getChildren().end();
      it++) {
    if ((**it).getTagName()==this->_tag) {
      dirs.push_back((**it)[this->_attName]);
    }
  }
  return dirs;
}

const bool Directory::changeDir(const std::string & newDirName) {
  if (newDirName == string("") || newDirName == string("/")) {
    // Reset to "root" or "home" directory.
    this->_cwd.erase(this->_cwd.begin()+1, this->_cwd.end());
    return true;
  } else if (newDirName == string("..")) {
    if (this->_cwd.size() > 1) {
      this->_cwd.pop_back();
    }  
    return true;
  } else {
    // So the user is trying to go to a named directory.
    const xml::Element & curDirElt = this->getCurDirElt();
    for(xml::Element::ElementCollection::const_iterator it 
	  = curDirElt.getChildren().begin(); 
	it != curDirElt.getChildren().end();
	it++) {
      if ((**it).getTagName()==this->_tag) {
	if ((**it)[this->_attName] == newDirName) {
	  this->_cwd.push_back(*it);
	  return true;
	} // end name if
      } // end tag if
    } // end for
  } // end if
  // If we got this far, then newDirName is not a 
  // valid directory to change to.
  std::cerr << "*** WARNING *** changeDir failed. "
	    << newDirName << " is not in "
	    << this->getCurDirName() << endl; 
  return false;
} // end changeDir()

} // end of namespace