// $Id: autocomplete.js,v 1.23 2008/01/04 11:53:21 goba Exp $

/**

 * Attaches the autocomplete behavior to all required fields

 */

Drupal.behaviors.autocomplete = function (context) {

  var acdb = [];

  $('input.autocomplete:not(.autocomplete-processed)', context).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]);

    $(this).addClass('autocomplete-processed');

  });

};

/**

 * Prevents the form from submitting if the suggestions popup is open

 * and closes the suggestions popup when doing so.

 */

Drupal.autocompleteSubmit = function () {

  return $('#autocomplete').each(function () {

    this.owner.hidePopup();

  }).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':

    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),

      dataType: 'json',

      success: function (matches) {

        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) {

        alert(Drupal.ahahError(xmlhttp, db.uri));

      }

    });

  }, 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 = '';

};