/**
 * Automatic ajax validation
 *
 * @see http://drupal.org/project/ajax
 * @see irc://freenode.net/#drupy
 * @depends Drupal 6
 * @author brendoncrawford
 * @note This file uses a 79 character width limit.
 * 
 *
 */

Drupal.Ajax = new Object;

Drupal.Ajax.plugins = {};

Drupal.Ajax.firstRun = false;

/**
 * Init function.
 * This is being executed by Drupal behaviours.
 * See bottom of script.
 * 
 * @param {HTMLElement} context
 * @return {Bool}
 */
Drupal.Ajax.init = function(context) {
  var f, s;
  if (f = $('.ajax-form', context)) {
    if (!Drupal.Ajax.firstRun) {
      Drupal.Ajax.invoke('init');
      Drupal.Ajax.firstRun = true;
    }
    s = $('input[type="submit"]', f);
    s.click(function(){
      this.form.ajax_activator = $(this);
      return true;
    });
    f.each(function(){
      this.ajax_activator = null;
      $(this).submit(function(){
        if (this.ajax_activator === null) {
          this.ajax_activator = $('#edit-submit', this);
        }
        if (this.ajax_activator.hasClass('ajax-trigger')) {
          Drupal.Ajax.go($(this), this.ajax_activator);
          return false;
        }
        else {
          return true;
        }
      });
      return true;
    });
  }
  return true;
};

/**
 * Invokes plugins
 * 
 * @param {Object} formObj
 * @param {Object} submitter
 */
Drupal.Ajax.invoke = function(hook, args) {
  var plugin, r, ret;
  ret = true;
  for (plugin in Drupal.Ajax.plugins) {
    r = Drupal.Ajax.plugins[plugin](hook, args);
    if (r === false) {
      ret = false;
    }
  }
  return ret;
};

/**
 * Handles submission
 * 
 * @param {Object} submitter_
 * @return {Bool}
 */
Drupal.Ajax.go = function(formObj, submitter) {
  var submitterVal, submitterName, extraData;
  Drupal.Ajax.invoke('submit', {submitter:submitter});
  submitterVal = submitter.val();
  submitterName = submitter.attr('name');
  submitter.val(Drupal.t('Loading...'));
  extraData = {};
  extraData[submitterName] = submitterVal;
  extraData['drupal_ajax'] = '1';
  formObj.a_ajaxSubmit({
    extraData : extraData,
    beforeSubmit : function(data) {
      data[data.length] = {
        name : submitterName,
        value : submitterVal
      };
      data[data.length] = {
        name : 'drupal_ajax',
        value : '1'
      };
      return true;
    },
    dataType : 'json',
    error: function (XMLHttpRequest, textStatus, errorThrown) {
      window.alert(Drupal.t('ajax.module: An unknown error has occurred.'));
      if (window.console) {
        console.log('error', arguments);
      }
      return true;
    },
    success: function(data){
      submitter.val(submitterVal);
      Drupal.Ajax.response(submitter, formObj, data);
      return true;
    }
  });
  return false;
};

/**
 * Handles messaging
 * 
 * @param {Object} formObj
 * @param {Object} submitter
 * @param {Object} data
 * @param {Object} options
 * @return {Bool}
 */
Drupal.Ajax.message = function(formObj, submitter, data, options) {
  var args;
  data.local = {
    submitter : submitter,
    form : formObj
  };
  if (Drupal.Ajax.invoke('message', data)) {
    Drupal.Ajax.writeMessage(data.local.form, data.local.submitter, options);
    Drupal.Ajax.invoke('afterMessage', data);
  }
  return true;
};

/**
 * Writes message
 * 
 * @param {Object} formObj
 * @param {Object} submitter
 * @param {Object} options
 * @return {Bool}
 */
Drupal.Ajax.writeMessage = function(formObj, submitter, options) {
  var i, _i, thisItem, log, errBox, h, data;
  if (options.action === 'notify') {
    // Cleanups
    $('.messages, .ajax-preview', formObj).remove();
    $('input, textarea').removeClass('error status warning required');
    // Preview
    if (options.type === 'preview') {
      log = $('<div>').addClass('ajax-preview');
      log.html(options.messages);
      formObj.prepend(log);
    }
    // Status, Error, Message
    else {
      log = $('<ul>');
      errBox = $(".messages." + options.type, formObj[0])
      for (i = 0, _i = options.messages.length; i < _i; i++) {
        thisItem = $('#' + options.messages[i].id, formObj[0])
        thisItem.addClass(options.type);
        if (options.messages[i].required) {
          thisItem.addClass('required');
        }
        log.append('<li>' + options.messages[i].value + '</li>');
      }
      if (errBox.length === 0) {
        errBox = $("<div class='messages " + options.type + "'>");
        formObj.prepend(errBox);
      }
      errBox.html(log);
    }
  }
  else if (options.action === 'clear') {
    $('.messages, .ajax-preview', formObj).remove();
  }
  return true;
};

/**
 * Updates message containers
 * 
 * @param {Object} updaters
 * @return {Bool}
 */
Drupal.Ajax.updater = function(updaters) {
  var i, _i, elm;
  for (i = 0, _i = updaters.length; i < _i; i++) {
    elm = $(updaters[i].selector);
    // HTML:IN
    if (updaters[i].type === 'html_in') {
      elm.html(updaters[i].value);
    }
    // HTML:OUT
    else if (updaters[i].type === 'html_out') {
      elm.replaceWith(updaters[i].value);
    }
    // FIELD
    else if (updaters[i].type === 'field') {
      elm.val(updaters[i].value);
    }
    // REMOVE
    else if(updaters[i].type === 'remove') {
      elm.remove();
    }
  }
  return true;
};

/**
 * Handles data response
 * 
 * @param {Object} submitter
 * @param {Object} formObj
 * @param {Object} data
 * @return {Bool}
 */
Drupal.Ajax.response = function(submitter, formObj, data){
  var newSubmitter;
  data.local = {
    submitter : submitter,
    form : formObj
  };
  /**
   * Failure
   */
  if (data.status === false) {
    Drupal.Ajax.updater(data.updaters);
    Drupal.Ajax.message(formObj, submitter, data, {
      action : 'notify',
      messages : data.messages_error,
      type : 'error'
    });
  }
  /**
   * Success
   */
  else {
    // Display preview
    if (data.preview !== null) {
      Drupal.Ajax.updater(data.updaters);
      Drupal.Ajax.message(formObj, submitter, data, {
        action : 'notify',
        messages : decodeURIComponent(data.preview),
        type : 'preview'
      });
    }
    // If no redirect, then simply show messages
    else if (data.redirect === null) {
      if (data.messages_status.length > 0) {
        Drupal.Ajax.message(formObj, submitter, data, {
          action : 'notify',
          messages : data.messages_status,
          type : 'status'
        });
      }
      if (data.messages_warning.length > 0) {
        Drupal.Ajax.message(formObj, submitter, data, {
          action : 'notify',
          messages : data.messages_warning,
          type : 'warning'
        });
      }
      if (data.messages_status.length === 0 &&
          data.messages_warning.length === 0) {
        Drupal.Ajax.message(formObj, submitter, data, {action:'clear'});
      }
    }
    // Redirect
    else {
      if (Drupal.Ajax.invoke('redirect', data)) {
        Drupal.Ajax.redirect( data.redirect );
      }
      else {
        Drupal.Ajax.updater(data.updaters);
        if (data.messages_status.length === 0 &&
            data.messages_warning.length === 0) {
          Drupal.Ajax.message(formObj, submitter, data, {action:'clear'});
        }
        else {
          Drupal.Ajax.message(formObj, submitter, data, {
            action : 'notify',
            messages : data.messages_status,
            type : 'status'
          });
        }
      }
    }
  }
  return true;
};


/**
 * Redirects to appropriate page
 * 
 * @todo
 *   Some of this functionality should possibly hapen on
 *   the server instead of client.
 * @param {String} url
 */
Drupal.Ajax.redirect = function(url) {
  window.location.href = url;
};

Drupal.behaviors.Ajax = Drupal.Ajax.init;