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/*
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Auto-Completion Textbox for GWT
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Copyright (C) 2006 Oliver Albers http://gwt.components.googlepages.com/
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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package org.tela_botanica.client;
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// TODO : traiter latence (augmenter en fonction rapidité saisie + texte vide)
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// TODO : traitement espace apres l'espece (%20)
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import com.google.gwt.user.client.HTTPRequest;
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import com.google.gwt.user.client.ResponseTextHandler;
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import com.google.gwt.user.client.ui.KeyboardListener;
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import com.google.gwt.user.client.ui.ListBox;
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import com.google.gwt.user.client.ui.PopupPanel;
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import com.google.gwt.user.client.ui.RootPanel;
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import com.google.gwt.user.client.ui.TextBox;
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import com.google.gwt.user.client.ui.Widget;
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import com.google.gwt.user.client.DOM;
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import com.google.gwt.user.client.Event;
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import java.util.Vector;
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import java.util.HashMap;
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public class AutoCompleteAsyncTextBox extends TextBox
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    implements KeyboardListener, SourcesAutoCompleteAsyncTextBoxEvents {
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  private String searchUrl = null;
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  private AutoCompleteAsyncTextBoxListenerCollection autoCompleteAsyncTextBoxListeners=null;
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  private HashMap cache = new HashMap();
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  private boolean searching = false;
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  private ResponseTextHandler responseTextHandler=null;
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  protected PopupPanel choicesPopup = new PopupPanel(true);
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  protected ListBox choices = new ListBox() {
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	  public void onBrowserEvent(Event event) {
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		  if (Event.ONCLICK == DOM.eventGetType(event)) {
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			  complete();
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		  }
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	  }
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  };
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  protected Vector items = new Vector();
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  protected boolean popupAdded = false;
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  protected boolean visible = false;
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  /**
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   * Value linked to current text
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   */
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  protected String currentValue = null;
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  /**
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   * Default Constructor
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   *
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   */
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  public AutoCompleteAsyncTextBox(ResponseTextHandler rsp)
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  {
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    super();
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    responseTextHandler=rsp;
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    this.addKeyboardListener(this);
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    choices.sinkEvents(Event.ONCLICK);
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    this.setStyleName("AutoCompleteAsyncTextBox");
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    choicesPopup.add(choices);
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    choicesPopup.addStyleName("AutoCompleteChoices");
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    choices.setStyleName("list");
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  }
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  public void addAutoCompleteAsyncTextBoxListener(AutoCompleteAsyncTextBoxListener listener) {
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	    if (autoCompleteAsyncTextBoxListeners == null) {
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	      autoCompleteAsyncTextBoxListeners = new AutoCompleteAsyncTextBoxListenerCollection();
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	    }
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	    autoCompleteAsyncTextBoxListeners.addElement(listener);
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  }
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  public void setSearchUrl(String url) {
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	  this.searchUrl=url;
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  }
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  private void doFetchURL(String match) {
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	  /*
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	   * Here we fetch the URL and call the handler
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	   */
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	  String rematch=match.replaceAll(" ","/");
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	  rematch=rematch.replaceAll("%","");
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	  if (this.searchUrl!=null && searching==false) {
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		  searching=true;
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	 //     HTTPRequest.asyncGet(URL.encodeComponent(this.searchUrl) + rematch, responseTextHandler );
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	      HTTPRequest.asyncGet(this.searchUrl + rematch, responseTextHandler );
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	  }
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  }
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  public void onKeyDown(Widget arg0, char arg1, int arg2) {
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	  if(arg1 == KEY_ENTER)
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	    {
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	      enterKey(arg0, arg1, arg2);
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	    }
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	    else if(arg1 == KEY_DOWN)
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	    {
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	      downKey(arg0, arg1, arg2);
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	    }
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	    else if(arg1 == KEY_UP)
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	    {
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	      upKey(arg0, arg1, arg2);
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	    }
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	    else if(arg1 == KEY_ESCAPE)
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	    {
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	      escapeKey(arg0, arg1, arg2);
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	    }
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  }
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  /**
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   * Not used at all (probleme avec ie, qui ne comprend pas les touches meta)
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   */
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  public void onKeyPress(Widget arg0, char arg1, int arg2) {
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  }
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  // The down key was pressed.
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  protected void downKey(Widget arg0, char arg1, int arg2) {
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	    int selectedIndex = choices.getSelectedIndex();
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	    selectedIndex++;
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	    if (selectedIndex >= choices.getItemCount())
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	    {
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	      selectedIndex = 0;
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	    }
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	    choices.setSelectedIndex(selectedIndex);
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 }
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  // The up key was pressed.
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  protected void upKey(Widget arg0, char arg1, int arg2) {
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    int selectedIndex = choices.getSelectedIndex();
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    selectedIndex--;
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    if(selectedIndex < 0)
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    {
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      selectedIndex = choices.getItemCount() - 1;
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    }
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    choices.setSelectedIndex(selectedIndex);
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  }
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  // The enter key was pressed.
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  protected void enterKey(Widget arg0, char arg1, int arg2) {
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      if(visible)
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      {
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        complete();
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      }
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      else {
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    	 // Validation de l'entree : appel asynchrone
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          if (autoCompleteAsyncTextBoxListeners!= null) {
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              autoCompleteAsyncTextBoxListeners.fireTextBoxEnter(this,this.getText(),currentValue);
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          }
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    	  currentValue=null;
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    	  this.setText("");
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      }
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  }
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//The escape key was pressed.
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  protected void escapeKey(Widget arg0, char arg1, int arg2) {
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    choices.clear();
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    items.clear();
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    choicesPopup.hide();
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    visible = false;
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  }
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  // Any other non-special key was pressed.
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  protected void otherKey(Widget arg0, char arg1, int arg2) {
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    // Lancement appel
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    String text = this.getText();
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	    if(text.length() > 0)
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	    {
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		      items.clear();
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		      if (getFromCache(text)!=null) {
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		    	  items=getFromCache(text);
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		    	  displayList();
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		      }
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		      else {
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222
		    	  this.doFetchURL(text);
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		      }
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		 }
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229
  }
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  public void onKeyUp(Widget arg0, char arg1, int arg2) {
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233
	  switch(arg1) {
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      case KEY_ALT:
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      case KEY_CTRL:
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      case KEY_DOWN:
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      case KEY_END:
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      case KEY_ENTER:
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      case KEY_ESCAPE:
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      case KEY_HOME:
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      case KEY_LEFT:
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      case KEY_PAGEDOWN:
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      case KEY_PAGEUP:
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      case KEY_RIGHT:
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      case KEY_SHIFT:
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      case KEY_TAB:
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      case KEY_UP:
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        break;
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      default:
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        otherKey(arg0, arg1, arg2);
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        break;
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    }
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  }
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  // Display assistant
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259
    public void displayList() {
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261
    	searching=false;
262
	    if(this.items.size() > 0)
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	    {
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	      addToCache(this.getText(),(Vector) items.clone());
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	      choices.clear();
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	      for(int i = 0; i < items.size(); i++)
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	      {
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	        choices.addItem(((String [])items.get(i))[0],((String [])items.get(i))[1]);
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	      }
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	      // if there is only one match and it is what is in the
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	      // text field anyways there is no need to show autocompletion
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	    //  if(items.size() == 1 && (((String []) items.get(0))[0]).compareTo(this.getText()) == 0)
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	     // {
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	       // choicesPopup.hide();
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	     // } else {
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	        choices.setSelectedIndex(0);
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	        choices.setVisibleItemCount(items.size());
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	        if(!popupAdded)
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	        {
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	          RootPanel.get().add(choicesPopup);
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	          popupAdded = true;
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	        }
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	        choicesPopup.show();
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	        visible = true;
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	        choicesPopup.setPopupPosition(this.getAbsoluteLeft(),
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	        this.getAbsoluteTop() + this.getOffsetHeight());
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	        choicesPopup.setWidth(this.getOffsetWidth() + "px");
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	        choices.setWidth(this.getOffsetWidth() + "px");
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	    //  }
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	    } else {
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	      visible = false;
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	      choicesPopup.hide();
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	    }
301
	  }
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  /**
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   * A mouseclick in the list of items
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   */
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  public void onChange(Widget arg0) {
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    complete();
308
  }
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311
  public void onClick(Widget arg0) {
312
    complete();
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  }
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  // add selected item to textbox
316
  protected void complete()
317
  {
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    if(choices.getItemCount() > 0)
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    {
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      this.setText(choices.getItemText(choices.getSelectedIndex()));
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      currentValue=choices.getValue(choices.getSelectedIndex());
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      if (autoCompleteAsyncTextBoxListeners!= null) {
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          autoCompleteAsyncTextBoxListeners.fireTextBoxComplete(responseTextHandler,this.getText(),currentValue);
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      }
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    }
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329
    visible=false;
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    items.clear();
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    choices.clear();
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    choicesPopup.hide();
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  }
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335
 
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  public void addItem(String item, String value) {
337
	  items.add(new String [] {item, value});
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  }
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340
  private void addToCache (String query, Vector result)
341
  {
342
	cache.put(query.toLowerCase(),result);
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  }
344
 
345
  private Vector getFromCache (String query)
346
  {
347
	return (Vector) cache.get(query.toLowerCase());
348
  }
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350
 
351
 
352
public String getValue() {
353
	return currentValue;
354
}
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356
 
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public  void setValue(String value) {
358
	 this.currentValue=value;
359
}
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362
}
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