// $Id: autocomplete.js,v 1.17 2007/01/09 07:31:04 drumm Exp $

/**
 * Attaches the autocomplete behaviour to all required fields
 */
Drupal.autocompleteAutoAttach = function () {
  var acdb = [];
  $('input.autocomplete').each(function () {
    var uri = this.value;
    if (!acdb[uri]) {
      acdb[uri] = new Drupal.ACDB(uri);
    }
    var input = $('#' + this.id.substr(0, this.id.length - 13))
      .attr('autocomplete', 'OFF')[0];
    $(input.form).submit(Drupal.autocompleteSubmit);
    new Drupal.jsAC(input, acdb[uri]);
  });
}

/**
 * Prevents the form from submitting if the suggestions popup is open
 * and closes the suggestions popup when doing so.
 */
/* edit by bookstrand
Drupal.autocompleteSubmit = function () {
  return $('#autocomplete').each(function () {
    this.owner.hidePopup();
  }).size() == 0;
}*/

Drupal.autocompleteSubmit = function () {
return $('#autocomplete').each(function () {
this.owner.hidePopup();
this.form.submit();
}).size() == 0;
};

/**
 * An AutoComplete object
 */
Drupal.jsAC = function (input, db) {
  var ac = this;
  this.input = input;
  this.db = db;

  $(this.input)
    .keydown(function (event) { return ac.onkeydown(this, event); })
    .keyup(function (event) { ac.onkeyup(this, event) })
    .blur(function () { ac.hidePopup(); ac.db.cancel(); });

};

/**
 * Handler for the "keydown" event
 */
Drupal.jsAC.prototype.onkeydown = function (input, e) {
  if (!e) {
    e = window.event;
  }
  switch (e.keyCode) {
    case 40: // down arrow
      this.selectDown();
      return false;
    case 38: // up arrow
      this.selectUp();
      return false;
    default: // all other keys
      return true;
  }
}

/**
 * Handler for the "keyup" event
 */
Drupal.jsAC.prototype.onkeyup = function (input, e) {
  if (!e) {
    e = window.event;
  }
  switch (e.keyCode) {
    case 16: // shift
    case 17: // ctrl
    case 18: // alt
    case 20: // caps lock
    case 33: // page up
    case 34: // page down
    case 35: // end
    case 36: // home
    case 37: // left arrow
    case 38: // up arrow
    case 39: // right arrow
    case 40: // down arrow
      return true;

    case 9:  // tab
    case 13: // enter
    case 27: // esc
      this.hidePopup(e.keyCode);
      return true;

    default: // all other keys
      if (input.value.length > 0)
        this.populatePopup();
      else
        this.hidePopup(e.keyCode);
      return true;
  }
}

/**
 * Puts the currently highlighted suggestion into the autocomplete field
 */
Drupal.jsAC.prototype.select = function (node) {
  this.input.value = node.autocompleteValue;
}

/**
 * Highlights the next suggestion
 */
Drupal.jsAC.prototype.selectDown = function () {
  if (this.selected && this.selected.nextSibling) {
    this.highlight(this.selected.nextSibling);
  }
  else {
    var lis = $('li', this.popup);
    if (lis.size() > 0) {
      this.highlight(lis.get(0));
    }
  }
}

/**
 * Highlights the previous suggestion
 */
Drupal.jsAC.prototype.selectUp = function () {
  if (this.selected && this.selected.previousSibling) {
    this.highlight(this.selected.previousSibling);
  }
}

/**
 * Highlights a suggestion
 */
Drupal.jsAC.prototype.highlight = function (node) {
  if (this.selected) {
    $(this.selected).removeClass('selected');
  }
  $(node).addClass('selected');
  this.selected = node;
}

/**
 * Unhighlights a suggestion
 */
Drupal.jsAC.prototype.unhighlight = function (node) {
  $(node).removeClass('selected');
  this.selected = false;
}

/**
 * Hides the autocomplete suggestions
 */
Drupal.jsAC.prototype.hidePopup = function (keycode) {
  // Select item if the right key or mousebutton was pressed
  if (this.selected && ((keycode && keycode != 46 && keycode != 8 && keycode != 27) || !keycode)) {
    this.input.value = this.selected.autocompleteValue;
  }
  // Hide popup
  var popup = this.popup;
  if (popup) {
    this.popup = null;
    $(popup).fadeOut('fast', function() { $(popup).remove(); });
  }
  this.selected = false;
}

/**
 * Positions the suggestions popup and starts a search
 */
Drupal.jsAC.prototype.populatePopup = function () {
  // Show popup
  if (this.popup) {
    $(this.popup).remove();
  }
  this.selected = false;
  this.popup = document.createElement('div');
  this.popup.id = 'autocomplete';
  this.popup.owner = this;
  $(this.popup).css({
    marginTop: this.input.offsetHeight +'px',
    width: (this.input.offsetWidth - 4) +'px',
    display: 'none'
  });
  $(this.input).before(this.popup);

  // Do search
  this.db.owner = this;
  this.db.search(this.input.value);
}

/**
 * Fills the suggestion popup with any matches received
 */
Drupal.jsAC.prototype.found = function (matches) {
  // If no value in the textfield, do not show the popup.
  if (!this.input.value.length) {
    return false;
  }

  // Prepare matches
  var ul = document.createElement('ul');
  var ac = this;
  for (key in matches) {
    var li = document.createElement('li');
    $(li)
      .html('<div>'+ matches[key] +'</div>')
      .mousedown(function () { ac.select(this); })
      .mouseover(function () { ac.highlight(this); })
      .mouseout(function () { ac.unhighlight(this); });
    li.autocompleteValue = key;
    $(ul).append(li);
  }

  // Show popup with matches, if any
  if (this.popup) {
    if (ul.childNodes.length > 0) {
      $(this.popup).empty().append(ul).show();
    }
    else {
      $(this.popup).css({visibility: 'hidden'});
      this.hidePopup();
    }
  }
}

Drupal.jsAC.prototype.setStatus = function (status) {
  switch (status) {
    case 'begin':
      $(this.input).addClass('throbbing');
      break;
    case 'cancel':
    case 'error':
	 //bookstrand You may try placing debugging or reporting here, but I haven't had any success with this yet. Alert seems to be the only function call that works, which is probably why it was used, but I'd rather a silent non-critical failure than a host of popup gnats to swat.
  $(this.input).removeClass('throbbing');
  break;
    case 'found':
      $(this.input).removeClass('throbbing');
      break;
  }
}

/**
 * An AutoComplete DataBase object
 */
Drupal.ACDB = function (uri) {
  this.uri = uri;
  this.delay = 300;
  this.cache = {};
}

/**
 * Performs a cached and delayed search
 */
Drupal.ACDB.prototype.search = function (searchString) {
  var db = this;
  this.searchString = searchString;

  // See if this key has been searched for before
  if (this.cache[searchString]) {
    return this.owner.found(this.cache[searchString]);
  }

  // Initiate delayed search
  if (this.timer) {
    clearTimeout(this.timer);
  }
  this.timer = setTimeout(function() {
    db.owner.setStatus('begin');

    // Ajax GET request for autocompletion
    $.ajax({
      type: "GET",
      url: db.uri +'/'+ Drupal.encodeURIComponent(searchString),
      success: function (data) {
        // Parse back result
        var matches = Drupal.parseJson(data);
        if (typeof matches['status'] == 'undefined' || matches['status'] != 0) {
          db.cache[searchString] = matches;
          // Verify if these are still the matches the user wants to see
          if (db.searchString == searchString) {
            db.owner.found(matches);
          }
          db.owner.setStatus('found');
        }
      },
      error: function (xmlhttp) {
        // bookstrand alert('An HTTP error '+ xmlhttp.status +' occured.\n'+ db.uri);
		//Of course, you could place the error handler here, but* it seemed more logical to use the structure already provided with the setStatus function call. This way it would be more likely to be catchable, since you could also add cases and send a different string for specific error types once identified.
  		db.owner.setStatus('error');
      }
    });
  }, this.delay);
}

/**
 * Cancels the current autocomplete request
 */
Drupal.ACDB.prototype.cancel = function() {
  if (this.owner) this.owner.setStatus('cancel');
  if (this.timer) clearTimeout(this.timer);
  this.searchString = '';
}

// Global Killswitch
if (Drupal.jsEnabled) {
  $(document).ready(Drupal.autocompleteAutoAttach);
}