[civicrm-core.git] / CRM / Core / Form.php

<?php
/*
 +--------------------------------------------------------------------+
 | CiviCRM version 4.4                                                |
 +--------------------------------------------------------------------+
 | Copyright CiviCRM LLC (c) 2004-2013                                |
 +--------------------------------------------------------------------+
 | This file is a part of CiviCRM.                                    |
 |                                                                    |
 | CiviCRM is free software; you can copy, modify, and distribute it  |
 | under the terms of the GNU Affero General Public License           |
 | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
 |                                                                    |
 | CiviCRM is distributed in the hope that it will be useful, but     |
 | WITHOUT ANY WARRANTY; without even the implied warranty of         |
 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.               |
 | See the GNU Affero General Public License for more details.        |
 |                                                                    |
 | You should have received a copy of the GNU Affero General Public   |
 | License and the CiviCRM Licensing Exception along                  |
 | with this program; if not, contact CiviCRM LLC                     |
 | at info[AT]civicrm[DOT]org. If you have questions about the        |
 | GNU Affero General Public License or the licensing of CiviCRM,     |
 | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
 +--------------------------------------------------------------------+
*/

/**
 * This is our base form. It is part of the Form/Controller/StateMachine
 * trifecta. Each form is associated with a specific state in the state
 * machine. Each form can also operate in various modes
 *
 * @package CRM
 * @copyright CiviCRM LLC (c) 2004-2013
 * $Id$
 *
 */

require_once 'HTML/QuickForm/Page.php';
class CRM_Core_Form extends HTML_QuickForm_Page {

  /**
   * The state object that this form belongs to
   * @var object
   */
  protected $_state;

  /**
   * The name of this form
   * @var string
   */
  protected $_name;

  /**
   * The title of this form
   * @var string
   */
  protected $_title = NULL;

  /**
   * The options passed into this form
   * @var mixed
   */
  protected $_options = NULL;

  /**
   * The mode of operation for this form
   * @var int
   */
  protected $_action;

  /**
   * the renderer used for this form
   *
   * @var object
   */
  protected $_renderer;

  /**
   * An array to hold a list of datefields on the form
   * so that they can be converted to ISO in a consistent manner
   *
   * @var array
   *
   * e.g on a form declare $_dateFields = array(
   *  'receive_date' => array('default' => 'now'),
   *  );
   *  then in postProcess call $this->convertDateFieldsToMySQL($formValues)
   *  to have the time field re-incorporated into the field & 'now' set if
   *  no value has been passed in
   */
  protected $_dateFields = array();

  /**
   * cache the smarty template for efficiency reasons
   *
   * @var CRM_Core_Smarty
   */
  static protected $_template;

  /**
   * What to return to the client if in ajax mode (snippet=json)
   *
   * @var array
   */
  public $ajaxResponse = array();

  /**
   * Stores info about reference fields for preprocessing
   * Public so that hooks can access it
   *
   * @var array
   */
  public $entityReferenceFields = array();

  /**
   * constants for attributes for various form elements
   * attempt to standardize on the number of variations that we
   * use of the below form elements
   *
   * @var const string
   */
  CONST ATTR_SPACING = '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;';

  /**
   * All checkboxes are defined with a common prefix. This allows us to
   * have the same javascript to check / clear all the checkboxes etc
   * If u have multiple groups of checkboxes, you will need to give them different
   * ids to avoid potential name collision
   *
   * @var const string / int
   */
  CONST CB_PREFIX = 'mark_x_', CB_PREFIY = 'mark_y_', CB_PREFIZ = 'mark_z_', CB_PREFIX_LEN = 7;

  /**
   * Constructor for the basic form page
   *
   * We should not use QuickForm directly. This class provides a lot
   * of default convenient functions, rules and buttons
   *
   * @param object    $state     State associated with this form
   * @param enum      $action    The mode the form is operating in (None/Create/View/Update/Delete)
   * @param string    $method    The type of http method used (GET/POST)
   * @param string    $name      The name of the form if different from class name
   *
   * @return object
   * @access public
   */
  function __construct(
    $state = NULL,
    $action = CRM_Core_Action::NONE,
    $method = 'post',
    $name   = NULL
  ) {

    if ($name) {
      $this->_name = $name;
    }
    else {
      $this->_name = CRM_Utils_String::getClassName(CRM_Utils_System::getClassName($this));
    }

    $this->HTML_QuickForm_Page($this->_name, $method);

    $this->_state =& $state;
    if ($this->_state) {
      $this->_state->setName($this->_name);
    }
    $this->_action = (int) $action;

    $this->registerRules();

    // let the constructor initialize this, should happen only once
    if (!isset(self::$_template)) {
      self::$_template = CRM_Core_Smarty::singleton();
    }

    $this->assign('snippet', (int) CRM_Utils_Array::value('snippet', $_REQUEST));
  }

  static function generateID() {
  }

  /**
   * register all the standard rules that most forms potentially use
   *
   * @return void
   * @access private
   *
   */
  function registerRules() {
    static $rules = array(
      'title', 'longTitle', 'variable', 'qfVariable',
      'phone', 'integer', 'query',
      'url', 'wikiURL',
      'domain', 'numberOfDigit',
      'date', 'currentDate',
      'asciiFile', 'htmlFile', 'utf8File',
      'objectExists', 'optionExists', 'postalCode', 'money', 'positiveInteger',
      'xssString', 'fileExists', 'autocomplete', 'validContact',
    );

    foreach ($rules as $rule) {
      $this->registerRule($rule, 'callback', $rule, 'CRM_Utils_Rule');
    }
  }

  /**
   * Simple easy to use wrapper around addElement. Deal with
   * simple validation rules
   *
   * @param string type of html element to be added
   * @param string name of the html element
   * @param string display label for the html element
   * @param string attributes used for this element.
   *               These are not default values
   * @param bool   is this a required field
   *
   * @return HTML_QuickForm_Element could be an error object
   * @access public
   *
   */
  function &add($type, $name, $label = '',
    $attributes = '', $required = FALSE, $javascript = NULL
  ) {
    $element = $this->addElement($type, $name, $label, $attributes, $javascript);
    if (HTML_QuickForm::isError($element)) {
      CRM_Core_Error::fatal(HTML_QuickForm::errorMessage($element));
    }

    if ($required) {
      if ($type == 'file') {
        $error = $this->addRule($name, ts('%1 is a required field.', array(1 => $label)), 'uploadedfile');
      }
      else {
        $error = $this->addRule($name, ts('%1 is a required field.', array(1 => $label)), 'required');
      }
      if (HTML_QuickForm::isError($error)) {
        CRM_Core_Error::fatal(HTML_QuickForm::errorMessage($element));
      }
    }

    return $element;
  }

  /**
   * This function is called before buildForm. Any pre-processing that
   * needs to be done for buildForm should be done here
   *
   * This is a virtual function and should be redefined if needed
   *
   * @access public
   *
   * @return void
   *
   */
  function preProcess() {}

  /**
   * This function is called after the form is validated. Any
   * processing of form state etc should be done in this function.
   * Typically all processing associated with a form should be done
   * here and relevant state should be stored in the session
   *
   * This is a virtual function and should be redefined if needed
   *
   * @access public
   *
   * @return void
   *
   */
  function postProcess() {}

  /**
   * This function is just a wrapper, so that we can call all the hook functions
   */
  function mainProcess() {
    $this->postProcess();
    $this->postProcessHook();

    // Respond with JSON if in AJAX context (also support legacy value '6')
    if (!empty($_REQUEST['snippet']) && in_array($_REQUEST['snippet'], array(CRM_Core_Smarty::PRINT_JSON, 6))) {
      $this->ajaxResponse['buttonName'] = str_replace('_qf_' . $this->getAttribute('id') . '_', '', $this->controller->getButtonName());
      $this->ajaxResponse['action'] = $this->_action;
      if (isset($this->_id) || isset($this->id)) {
        $this->ajaxResponse['id'] = isset($this->id) ? $this->id : $this->_id;
      }
      CRM_Core_Page_AJAX::returnJsonResponse($this->ajaxResponse);
    }
  }

  /**
   * The postProcess hook is typically called by the framework
   * However in a few cases, the form exits or redirects early in which
   * case it needs to call this function so other modules can do the needful
   * Calling this function directly should be avoided if possible. In general a
   * better way is to do setUserContext so the framework does the redirect
   *
   */
  function postProcessHook() {
    CRM_Utils_Hook::postProcess(get_class($this), $this);
  }

  /**
   * This virtual function is used to build the form. It replaces the
   * buildForm associated with QuickForm_Page. This allows us to put
   * preProcess in front of the actual form building routine
   *
   * @access public
   *
   * @return void
   *
   */
  function buildQuickForm() {}

  /**
   * This virtual function is used to set the default values of
   * various form elements
   *
   * access        public
   *
   * @return array reference to the array of default values
   *
   */
  function setDefaultValues() {}

  /**
   * This is a virtual function that adds group and global rules to
   * the form. Keeping it distinct from the form to keep code small
   * and localized in the form building code
   *
   * @access public
   *
   * @return void
   *
   */
  function addRules() {}

  function validate() {
    $error = parent::validate();

    $hookErrors = CRM_Utils_Hook::validate(
      get_class($this),
      $this->_submitValues,
      $this->_submitFiles,
      $this
    );

    if (!is_array($hookErrors)) {
      $hookErrors = array();
    }

    CRM_Utils_Hook::validateForm(
      get_class($this),
      $this->_submitValues,
      $this->_submitFiles,
      $this,
      $hookErrors
    );

    if (!empty($hookErrors)) {
      $this->_errors += $hookErrors;
    }

    return (0 == count($this->_errors));
  }

  /**
   * Core function that builds the form. We redefine this function
   * here and expect all CRM forms to build their form in the function
   * buildQuickForm.
   *
   */
  function buildForm() {
    $this->_formBuilt = TRUE;

    $this->preProcess();

    $this->assign('translatePermission', CRM_Core_Permission::check('translate CiviCRM'));

    if (
      $this->controller->_key &&
      $this->controller->_generateQFKey
    ) {
      $this->addElement('hidden', 'qfKey', $this->controller->_key);
      $this->assign('qfKey', $this->controller->_key);

    }

    // _generateQFKey suppresses the qfKey generation on form snippets that
    // are part of other forms, hence we use that to avoid adding entryURL
    if ($this->controller->_generateQFKey && $this->controller->_entryURL) {
      $this->addElement('hidden', 'entryURL', $this->controller->_entryURL);
    }

    $this->buildQuickForm();

    $defaults = $this->setDefaultValues();
    unset($defaults['qfKey']);

    if (!empty($defaults)) {
      $this->setDefaults($defaults);
    }

    // call the form hook
    // also call the hook function so any modules can set thier own custom defaults
    // the user can do both the form and set default values with this hook
    CRM_Utils_Hook::buildForm(get_class($this), $this);

    $this->preprocessReferenceFields();

    $this->addRules();
  }

  /**
   * Add default Next / Back buttons
   *
   * @param array   array of associative arrays in the order in which the buttons should be
   *                displayed. The associate array has 3 fields: 'type', 'name' and 'isDefault'
   *                The base form class will define a bunch of static arrays for commonly used
   *                formats
   *
   * @return void
   *
   * @access public
   *
   */
  function addButtons($params) {
    $prevnext = array();
    $spacing = array();
    foreach ($params as $button) {
      $js = CRM_Utils_Array::value('js', $button);
      $isDefault = CRM_Utils_Array::value('isDefault', $button, FALSE);
      if ($isDefault) {
        $attrs = array('class' => 'form-submit default');
      }
      else {
        $attrs = array('class' => 'form-submit');
      }

      if ($js) {
        $attrs = array_merge($js, $attrs);
      }

      if ($button['type'] === 'reset') {
        $prevnext[] = $this->createElement($button['type'], 'reset', $button['name'], $attrs);
      }
      else {
        if (!empty($button['subName'])) {
          $buttonName = $this->getButtonName($button['type'], $button['subName']);
        }
        else {
          $buttonName = $this->getButtonName($button['type']);
        }

        if (in_array($button['type'], array(
          'next', 'upload')) && $button['name'] === 'Save') {
          $attrs = array_merge($attrs, (array('accesskey' => 'S')));
        }
        $prevnext[] = $this->createElement('submit', $buttonName, $button['name'], $attrs);
      }
      if (!empty($button['isDefault'])) {
        $this->setDefaultAction($button['type']);
      }

      // if button type is upload, set the enctype
      if ($button['type'] == 'upload') {
        $this->updateAttributes(array('enctype' => 'multipart/form-data'));
        $this->setMaxFileSize();
      }

      // hack - addGroup uses an array to express variable spacing, read from the last element
      $spacing[] = CRM_Utils_Array::value('spacing', $button, self::ATTR_SPACING);
    }
    $this->addGroup($prevnext, 'buttons', '', $spacing, FALSE);
  }

  /**
   * getter function for Name
   *
   * @return string
   * @access public
   */
  function getName() {
    return $this->_name;
  }

  /**
   * getter function for State
   *
   * @return object
   * @access public
   */
  function &getState() {
    return $this->_state;
  }

  /**
   * getter function for StateType
   *
   * @return int
   * @access public
   */
  function getStateType() {
    return $this->_state->getType();
  }

  /**
   * getter function for title. Should be over-ridden by derived class
   *
   * @return string
   * @access public
   */
  function getTitle() {
    return $this->_title ? $this->_title : ts('ERROR: Title is not Set');
  }

  /**
   * setter function for title.
   *
   * @param string $title the title of the form
   *
   * @return void
   * @access public
   */
  function setTitle($title) {
    $this->_title = $title;
  }

  /**
   * Setter function for options
   *
   * @param mixed
   *
   * @return void
   * @access public
   */
  function setOptions($options) {
    $this->_options = $options;
  }

  /**
   * getter function for link.
   *
   * @return string
   * @access public
   */
  function getLink() {
    $config = CRM_Core_Config::singleton();
    return CRM_Utils_System::url($_GET[$config->userFrameworkURLVar],
      '_qf_' . $this->_name . '_display=true'
    );
  }

  /**
   * boolean function to determine if this is a one form page
   *
   * @return boolean
   * @access public
   */
  function isSimpleForm() {
    return $this->_state->getType() & (CRM_Core_State::START | CRM_Core_State::FINISH);
  }

  /**
   * getter function for Form Action
   *
   * @return string
   * @access public
   */
  function getFormAction() {
    return $this->_attributes['action'];
  }

  /**
   * setter function for Form Action
   *
   * @param string
   *
   * @return void
   * @access public
   */
  function setFormAction($action) {
    $this->_attributes['action'] = $action;
  }

  /**
   * render form and return contents
   *
   * @return string
   * @access public
   */
  function toSmarty() {
    $renderer = $this->getRenderer();
    $this->accept($renderer);
    $content = $renderer->toArray();
    $content['formName'] = $this->getName();
    return $content;
  }

  /**
   * getter function for renderer. If renderer is not set
   * create one and initialize it
   *
   * @return object
   * @access public
   */
  function &getRenderer() {
    if (!isset($this->_renderer)) {
      $this->_renderer = CRM_Core_Form_Renderer::singleton();
    }
    return $this->_renderer;
  }

  /**
   * Use the form name to create the tpl file name
   *
   * @return string
   * @access public
   */
  function getTemplateFileName() {
    $ext = CRM_Extension_System::singleton()->getMapper();
    if ($ext->isExtensionClass(CRM_Utils_System::getClassName($this))) {
      $filename = $ext->getTemplateName(CRM_Utils_System::getClassName($this));
      $tplname = $ext->getTemplatePath(CRM_Utils_System::getClassName($this)) . DIRECTORY_SEPARATOR . $filename;
    }
    else {
      $tplname = str_replace('_',
        DIRECTORY_SEPARATOR,
        CRM_Utils_System::getClassName($this)
      ) . '.tpl';
    }
    return $tplname;
  }

  /**
   * A wrapper for getTemplateFileName that includes calling the hook to
   * prevent us from having to copy & paste the logic of calling the hook
   */
  function getHookedTemplateFileName() {
    $pageTemplateFile = $this->getTemplateFileName();
    CRM_Utils_Hook::alterTemplateFile(get_class($this), $this, 'page', $pageTemplateFile);
    return $pageTemplateFile;
  }

  /**
   * Default extra tpl file basically just replaces .tpl with .extra.tpl
   * i.e. we dont override
   *
   * @return string
   * @access public
   */
  function overrideExtraTemplateFileName() {
    return NULL;
  }

  /**
   * Error reporting mechanism
   *
   * @param string  $message Error Message
   * @param int     $code    Error Code
   * @param CRM_Core_DAO $dao     A data access object on which we perform a rollback if non - empty
   *
   * @return void
   * @access public
   */
  function error($message, $code = NULL, $dao = NULL) {
    if ($dao) {
      $dao->query('ROLLBACK');
    }

    $error = CRM_Core_Error::singleton();

    $error->push($code, $message);
  }

  /**
   * Store the variable with the value in the form scope
   *
   * @param  string name  : name  of the variable
   * @param  mixed  value : value of the variable
   *
   * @access public
   *
   * @return void
   *
   */
  function set($name, $value) {
    $this->controller->set($name, $value);
  }

  /**
   * Get the variable from the form scope
   *
   * @param  string name  : name  of the variable
   *
   * @access public
   *
   * @return mixed
   *
   */
  function get($name) {
    return $this->controller->get($name);
  }

  /**
   * getter for action
   *
   * @return int
   * @access public
   */
  function getAction() {
    return $this->_action;
  }

  /**
   * setter for action
   *
   * @param  int  $action the mode we want to set the form
   *
   * @return void
   * @access public
   */
  function setAction($action) {
    $this->_action = $action;
  }

  /**
   * assign value to name in template
   *
   * @param array|string $name  name  of variable
   * @param mixed $value value of varaible
   *
   * @return void
   * @access public
   */
  function assign($var, $value = NULL) {
    self::$_template->assign($var, $value);
  }

  /**
   * assign value to name in template by reference
   *
   * @param array|string $name  name  of variable
   * @param mixed $value value of varaible
   *
   * @return void
   * @access public
   */
  function assign_by_ref($var, &$value) {
    self::$_template->assign_by_ref($var, $value);
  }

  /**
   * appends values to template variables
   *
   * @param array|string $tpl_var the template variable name(s)
   * @param mixed $value the value to append
   * @param bool $merge
   */
  function append($tpl_var, $value=NULL, $merge=FALSE) {
    self::$_template->append($tpl_var, $value, $merge);
  }

  /**
   * Returns an array containing template variables
   *
   * @param string $name
   * @param string $type
   * @return array
   */
  function get_template_vars($name=null) {
    return self::$_template->get_template_vars($name);
  }

  function &addRadio($name, $title, &$values, $attributes = NULL, $separator = NULL, $required = FALSE) {
    $options = array();
    if (empty($attributes)) {
      $attributes = array('id_suffix' => $name);
    }
    else {
      $attributes = array_merge($attributes, array('id_suffix' => $name));
    }
    foreach ($values as $key => $var) {
      $options[] = $this->createElement('radio', NULL, NULL, $var, $key, $attributes);
    }
    $group = $this->addGroup($options, $name, $title, $separator);
    if ($required) {
      $this->addRule($name, ts('%1 is a required field.', array(1 => $title)), 'required');
    }
    return $group;
  }

  function addYesNo($id, $title, $dontKnow = NULL, $required = NULL, $attribute = NULL) {
    if (empty($attribute)) {
      $attribute = array('id_suffix' => $id);
    }
    else {
      $attribute = array_merge($attribute, array('id_suffix' => $id));
    }
    $choice   = array();
    $choice[] = $this->createElement('radio', NULL, '11', ts('Yes'), '1', $attribute);
    $choice[] = $this->createElement('radio', NULL, '11', ts('No'), '0', $attribute);
    if ($dontKnow) {
      $choice[] = $this->createElement('radio', NULL, '22', ts("Don't Know"), '2', $attribute);
    }
    $this->addGroup($choice, $id, $title);

    if ($required) {
      $this->addRule($id, ts('%1 is a required field.', array(1 => $title)), 'required');
    }
  }

  function addCheckBox($id, $title, $values, $other = NULL,
    $attributes       = NULL, $required = NULL,
    $javascriptMethod = NULL,
    $separator        = '<br />', $flipValues = FALSE
  ) {
    $options = array();

    if ($javascriptMethod) {
      foreach ($values as $key => $var) {
        if (!$flipValues) {
          $options[] = $this->createElement('checkbox', $var, NULL, $key, $javascriptMethod);
        }
        else {
          $options[] = $this->createElement('checkbox', $key, NULL, $var, $javascriptMethod);
        }
      }
    }
    else {
      foreach ($values as $key => $var) {
        if (!$flipValues) {
          $options[] = $this->createElement('checkbox', $var, NULL, $key);
        }
        else {
          $options[] = $this->createElement('checkbox', $key, NULL, $var);
        }
      }
    }

    $this->addGroup($options, $id, $title, $separator);

    if ($other) {
      $this->addElement('text', $id . '_other', ts('Other'), $attributes[$id . '_other']);
    }

    if ($required) {
      $this->addRule($id,
        ts('%1 is a required field.', array(1 => $title)),
        'required'
      );
    }
  }

  function resetValues() {
    $data = $this->controller->container();
    $data['values'][$this->_name] = array();
  }

  /**
   * simple shell that derived classes can call to add buttons to
   * the form with a customized title for the main Submit
   *
   * @param string $title title of the main button
   * @param string $type  button type for the form after processing
   * @param string $submitOnce If true, add javascript to next button submit which prevents it from being clicked more than once
   *
   * @return void
   * @access public
   */
  function addDefaultButtons($title, $nextType = 'next', $backType = 'back', $submitOnce = FALSE) {
    $buttons = array();
    if ($backType != NULL) {
      $buttons[] = array(
        'type' => $backType,
        'name' => ts('Previous'),
      );
    }
    if ($nextType != NULL) {
      $nextButton = array(
        'type' => $nextType,
        'name' => $title,
        'isDefault' => TRUE,
      );
      if ($submitOnce) {
        $nextButton['js'] = array('onclick' => "return submitOnce(this,'{$this->_name}','" . ts('Processing') . "');");
      }
      $buttons[] = $nextButton;
    }
    $this->addButtons($buttons);
  }

  function addDateRange($name, $from = '_from', $to = '_to', $label = 'From:', $dateFormat = 'searchDate', $required = FALSE, $displayTime = FALSE) {
    if ($displayTime) {
      $this->addDateTime($name . $from, $label, $required, array('formatType' => $dateFormat));
      $this->addDateTime($name . $to, ts('To:'), $required, array('formatType' => $dateFormat));
    } else {
      $this->addDate($name . $from, $label, $required, array('formatType' => $dateFormat));
      $this->addDate($name . $to, ts('To:'), $required, array('formatType' => $dateFormat));
    }
  }

  /**
   * Adds a select based on field metadata
   * TODO: This could be even more generic and widget type (select in this case) could also be read from metadata
   * @param CRM_Core_DAO $baoName - string representing bao object
   * @param $name
   * @param array $props
   * @param bool $required
   * @throws CRM_Core_Exception
   * @return HTML_QuickForm_Element
   */
  function addSelect($baoName, $name, $props = array(), $required = FALSE) {
    $options = $baoName::buildOptions($name, 'create');
    if ($options === FALSE) {
      throw new CRM_Core_Exception('No option list for field ' . $name);
    }
    if (!array_key_exists('placeholder', $props)) {
      $props['placeholder'] = $required ? ts('- select -') : ts('- none -');
    }
    if (!empty($props['placeholder']) && empty($props['multiple'])) {
      $options = array('' => '') + $options;
    }
    // Handle custom field
    if (strpos($name, 'custom_') === 0 && is_numeric($name[7])) {
      list(, $id) = explode('_', $name);
      $label = isset($props['label']) ? $props['label'] : CRM_Core_DAO::getFieldValue('CRM_Core_DAO_CustomField', 'label', $id);
      $props['data-option-group'] = CRM_Core_DAO::getFieldValue('CRM_Core_DAO_CustomField', 'option_group_id', $id);
    }
    // Core field
    else {
      $bao = new $baoName;
      $meta = $bao->getFieldSpec($name);
      $bao->free();
      // Todo: localize
      $label = CRM_Utils_Array::value('label', $props, $meta['title']);
      if (!empty($meta['pseudoconstant']['optionGroupName'])) {
        $props['data-option-group'] = CRM_Core_DAO::getFieldValue('CRM_Core_DAO_OptionGroup', $meta['pseudoconstant']['optionGroupName'], 'id', 'name');
      }
    }
    $props['class'] = isset($props['class']) ? $props['class'] . ' ' : '';
    $props['class'] .= "crm-select2";
    return $this->add('select', $name, $label, $options, $required, $props);
  }

  /**
   * Add a widget for selecting/editing/creating/copying a profile form
   *
   * @param string $name HTML form-element name
   * @param string $label Printable label
   * @param string $allowCoreTypes only present a UFGroup if its group_type includes a subset of $allowCoreTypes; e.g. 'Individual', 'Activity'
   * @param string $allowSubTypes only present a UFGroup if its group_type is compatible with $allowSubypes
   * @param array $entities
   */
  function addProfileSelector($name, $label, $allowCoreTypes, $allowSubTypes, $entities) {
    // Output widget
    // FIXME: Instead of adhoc serialization, use a single json_encode()
    CRM_UF_Page_ProfileEditor::registerProfileScripts();
    CRM_UF_Page_ProfileEditor::registerSchemas(CRM_Utils_Array::collect('entity_type', $entities));
    $this->add('text', $name, $label, array(
      'class' => 'crm-profile-selector',
      // Note: client treats ';;' as equivalent to \0, and ';;' works better in HTML
      'data-group-type' => CRM_Core_BAO_UFGroup::encodeGroupType($allowCoreTypes, $allowSubTypes, ';;'),
      'data-entities' => json_encode($entities),
    ));
  }

  function addWysiwyg($name, $label, $attributes, $forceTextarea = FALSE) {
    // 1. Get configuration option for editor (tinymce, ckeditor, pure textarea)
    // 2. Based on the option, initialise proper editor
    $editorID = CRM_Core_BAO_Setting::getItem(CRM_Core_BAO_Setting::SYSTEM_PREFERENCES_NAME,
      'editor_id'
    );
    $editor = strtolower(CRM_Utils_Array::value($editorID,
        CRM_Core_OptionGroup::values('wysiwyg_editor')
      ));
    if (!$editor || $forceTextarea) {
      $editor = 'textarea';
    }
    if ($editor == 'joomla default editor') {
      $editor = 'joomlaeditor';
    }

    if ($editor == 'drupal default editor') {
      $editor = 'drupalwysiwyg';
    }

    //lets add the editor as a attribute
    $attributes['editor'] = $editor;

    $this->addElement($editor, $name, $label, $attributes);
    $this->assign('editor', $editor);

    // include wysiwyg editor js files
    // FIXME: This code does not make any sense
    $includeWysiwygEditor = FALSE;
    $includeWysiwygEditor = $this->get('includeWysiwygEditor');
    if (!$includeWysiwygEditor) {
      $includeWysiwygEditor = TRUE;
      $this->set('includeWysiwygEditor', $includeWysiwygEditor);
    }

    $this->assign('includeWysiwygEditor', $includeWysiwygEditor);
  }

  function addCountry($id, $title, $required = NULL, $extra = NULL) {
    $this->addElement('select', $id, $title,
      array(
        '' => ts('- select -')) + CRM_Core_PseudoConstant::country(), $extra
    );
    if ($required) {
      $this->addRule($id, ts('Please select %1', array(1 => $title)), 'required');
    }
  }

  function addSelectOther($name, $label, $options, $attributes, $required = NULL, $javascriptMethod = NULL) {

    $this->addElement('select', $name . '_id', $label, $options, $javascriptMethod);

    if ($required) {
      $this->addRule($name . '_id', ts('Please select %1', array(1 => $label)), 'required');
    }
  }

  public function getRootTitle() {
    return NULL;
  }

  public function getCompleteTitle() {
    return $this->getRootTitle() . $this->getTitle();
  }

  static function &getTemplate() {
    return self::$_template;
  }

  function addUploadElement($elementName) {
    $uploadNames = $this->get('uploadNames');
    if (!$uploadNames) {
      $uploadNames = array();
    }
    if (is_array($elementName)) {
      foreach ($elementName as $name) {
        if (!in_array($name, $uploadNames)) {
          $uploadNames[] = $name;
        }
      }
    }
    else {
      if (!in_array($elementName, $uploadNames)) {
        $uploadNames[] = $elementName;
      }
    }
    $this->set('uploadNames', $uploadNames);

    $config = CRM_Core_Config::singleton();
    if (!empty($uploadNames)) {
      $this->controller->addUploadAction($config->customFileUploadDir, $uploadNames);
    }
  }

  function buttonType() {
    $uploadNames = $this->get('uploadNames');
    $buttonType = (is_array($uploadNames) && !empty($uploadNames)) ? 'upload' : 'next';
    $this->assign('buttonType', $buttonType);
    return $buttonType;
  }

  function getVar($name) {
    return isset($this->$name) ? $this->$name : NULL;
  }

  function setVar($name, $value) {
    $this->$name = $value;
  }

  /**
   *  Function to add date
   *  @param string $name   name of the element
   *  @param string $label  label of the element
   *  @param array  $attributes key / value pair
   *
   // if you need time
   *  $attributes = array ( 'addTime' => true,
   *                        'formatType' => 'relative' or 'birth' etc check advanced date settings
   *                      );
   *  @param boolean $required  true if required
   *
   */
  function addDate($name, $label, $required = FALSE, $attributes = NULL) {
    if (!empty($attributes['formatType'])) {
      // get actual format
      $params = array('name' => $attributes['formatType']);
      $values = array();

      // cache date information
      static $dateFormat;
      $key = "dateFormat_" . str_replace(' ', '_', $attributes['formatType']);
      if (empty($dateFormat[$key])) {
        CRM_Core_DAO::commonRetrieve('CRM_Core_DAO_PreferencesDate', $params, $values);
        $dateFormat[$key] = $values;
      }
      else {
        $values = $dateFormat[$key];
      }

      if ($values['date_format']) {
        $attributes['format'] = $values['date_format'];
      }

      if (!empty($values['time_format'])) {
        $attributes['timeFormat'] = $values['time_format'];
      }
      $attributes['startOffset'] = $values['start'];
      $attributes['endOffset'] = $values['end'];
    }

    $config = CRM_Core_Config::singleton();
    if (empty($attributes['format'])) {
      $attributes['format'] = $config->dateInputFormat;
    }

    if (!isset($attributes['startOffset'])) {
      $attributes['startOffset'] = 10;
    }

    if (!isset($attributes['endOffset'])) {
      $attributes['endOffset'] = 10;
    }

    $this->add('text', $name, $label, $attributes);

    if (!empty($attributes['addTime']) || !empty($attributes['timeFormat'])) {

      if (!isset($attributes['timeFormat'])) {
        $timeFormat = $config->timeInputFormat;
      }
      else {
        $timeFormat = $attributes['timeFormat'];
      }

      // 1 - 12 hours and 2 - 24 hours, but for jquery widget it is 0 and 1 respectively
      if ($timeFormat) {
        $show24Hours = TRUE;
        if ($timeFormat == 1) {
          $show24Hours = FALSE;
        }

        //CRM-6664 -we are having time element name
        //in either flat string or an array format.
        $elementName = $name . '_time';
        if (substr($name, -1) == ']') {
          $elementName = substr($name, 0, strlen($name) - 1) . '_time]';
        }

        $this->add('text', $elementName, ts('Time'), array('timeFormat' => $show24Hours));
      }
    }

    if ($required) {
      $this->addRule($name, ts('Please select %1', array(1 => $label)), 'required');
      if (!empty($attributes['addTime']) && !empty($attributes['addTimeRequired'])) {
        $this->addRule($elementName, ts('Please enter a time.'), 'required');
      }
    }
  }

  /**
   *  Function that will add date and time
   */
  function addDateTime($name, $label, $required = FALSE, $attributes = NULL) {
    $addTime = array('addTime' => TRUE);
    if (is_array($attributes)) {
      $attributes = array_merge($attributes, $addTime);
    }
    else {
      $attributes = $addTime;
    }

    $this->addDate($name, $label, $required, $attributes);
  }

  /**
   * add a currency and money element to the form
   */
  function addMoney($name,
    $label,
    $required        = FALSE,
    $attributes      = NULL,
    $addCurrency     = TRUE,
    $currencyName    = 'currency',
    $defaultCurrency = NULL,
    $freezeCurrency  = FALSE
  ) {
    $element = $this->add('text', $name, $label, $attributes, $required);
    $this->addRule($name, ts('Please enter a valid amount.'), 'money');

    if ($addCurrency) {
      $ele = $this->addCurrency($currencyName, NULL, TRUE, $defaultCurrency, $freezeCurrency);
    }

    return $element;
  }

  /**
   * add currency element to the form
   */
  function addCurrency($name = 'currency',
    $label           = NULL,
    $required        = TRUE,
    $defaultCurrency = NULL,
    $freezeCurrency  = FALSE
  ) {
    $currencies = CRM_Core_OptionGroup::values('currencies_enabled');
    if (!$required) {
      $currencies = array(
        '' => ts('- select -')) + $currencies;
    }
    $ele = $this->add('select', $name, $label, $currencies, $required);
    if ($freezeCurrency) {
      $ele->freeze();
    }
    if (!$defaultCurrency) {
      $config = CRM_Core_Config::singleton();
      $defaultCurrency = $config->defaultCurrency;
    }
    $this->setDefaults(array($name => $defaultCurrency));
  }

  /**
   * Create a single or multiple entity ref field
   * @param string $name
   * @param string $label
   * @param array $props mix of html and widget properties, including:
   *  - select - params to give to select2 widget
   *  - api - array of settings for the api:
   *     - "entity" - defaults to contact
   *     - "action" - defaults to get (getquick when entity is contact)
   *     - "params" - additional params to pass to the api
   *     - "key"    - what to store as this field's value - defaults to "id"
   *     - "label"  - what to show to the user - defaults to "label"
   *     - "search" - rarely used - only needed if search field is different from label field
   *  - placeholder - string
   *  - multiple - bool
   *  - class, etc. - other html properties
   * @param bool $required
   * @return HTML_QuickForm_Element
   */
  function addEntityRef($name, $label, $props = array(), $required = FALSE) {
    $props['api'] = CRM_Utils_Array::value('api', $props, array());
    // Merge in defaults for api params
    $props['api'] += array(
      'entity' => 'contact',
      'key' => 'id',
    );
    $props['api'] += array(
      'action' => $props['api']['entity'] == 'contact' ? 'getquick' : 'get',
      'label' => $props['api']['entity'] == 'contact' ? 'data' : 'label',
    );
    // this can be ommitted for normal apis since search field is usually the same as label field. But getquick is bizarre.
    $props['api'] += array(
      'search' => $props['api']['entity'] == 'contact' ? 'name' : $props['api']['label'],
    );

    $props['class'] = isset($props['class']) ? $props['class'] . ' ' : '';
    $props['class'] .= "crm-select2 crm-{$props['api']['entity']}-ref-field";

    $props['select'] = CRM_Utils_Array::value('select', $props, array()) + array(
      'minimumInputLength' => 1,
      'multiple' => !empty($props['multiple']),
      'placeholder' => CRM_Utils_Array::value('placeholder', $props, $required ? ts('- select -') : ts('- none -')),
      'allowClear' => !$required,
      // Disabled pending https://github.com/ivaynberg/select2/pull/2092
      //'formatInputTooShort' => ts('Start typing a name or email address...'),
      //'formatNoMatches' => ts('No contacts found.'),
    );

    $this->entityReferenceFields[] = $name;
    $this->formatReferenceFieldAttributes($props);
    return $this->add('text', $name, $label, $props, $required);
  }

  /**
   * @param $props
   */
  private function formatReferenceFieldAttributes(&$props) {
    $props['data-select-params'] = json_encode($props['select']);
    $props['data-api-params'] = json_encode($props['api']);
    CRM_Utils_Array::remove($props, 'multiple', 'select', 'api', 'placeholder');
  }

  /**
   * Convert IDs to values and format for display
   */
  private function preprocessReferenceFields() {
    foreach ($this->entityReferenceFields as $name) {
      $field = $this->getElement($name);
      $val = $field->getValue();
      // Support array values
      if (is_array($val)) {
        $val = implode(',', $val);
        $field->setValue($val);
      }
      if ($val) {
        $data = array();
        $api = json_decode($field->getAttribute('data-api-params'), TRUE);
        $select = json_decode($field->getAttribute('data-select-params'), TRUE);
        // Support serialized values
        if (strpos($val, CRM_Core_DAO::VALUE_SEPARATOR) !== FALSE) {
          $val = str_replace(CRM_Core_DAO::VALUE_SEPARATOR, ',', trim($val, CRM_Core_DAO::VALUE_SEPARATOR));
          $field->setValue($val);
        }
        // TODO: we could fetch multiple values with array(IN => $val) but not all apis support this
        foreach (explode(',', $val) as $v) {
          $result = civicrm_api3($api['entity'], $api['action'], array('sequential' => 1, $api['key'] => $v));
          if (!empty($result['values'])) {
            $data[] = array('id' => $v, 'text' => $result['values'][0][$api['label']]);
          }
        }
        if ($field->isFrozen()) {
          $field->removeAttribute('class');
        }
        if ($data) {
          // Simplify array for single selects - makes client-side code simpler (but feels somehow wrong)
          if (empty($select['multiple'])) {
            $data = $data[0];
          }
          $field->setAttribute('data-entity-value', json_encode($data));
        }
      }
    }
  }

  /**
   * Convert all date fields within the params to mysql date ready for the
   * BAO layer. In this case fields are checked against the $_datefields defined for the form
   * and if time is defined it is incorporated
   *
   * @param array $params input params from the form
   *
   * @todo it would probably be better to work on $this->_params than a passed array
   * @todo standardise the format which dates are passed to the BAO layer in & remove date
   * handling from BAO
   */
  function convertDateFieldsToMySQL(&$params){
    foreach ($this->_dateFields as $fieldName => $specs){
      if(!empty($params[$fieldName])){
        $params[$fieldName] = CRM_Utils_Date::isoToMysql(
          CRM_Utils_Date::processDate(
          $params[$fieldName],
          CRM_Utils_Array::value("{$fieldName}_time", $params), TRUE)
        );
      }
      else{
        if(isset($specs['default'])){
          $params[$fieldName] = date('YmdHis', strtotime($specs['default']));
        }
      }
    }
  }

  function removeFileRequiredRules($elementName) {
    $this->_required = array_diff($this->_required, array($elementName));
    if (isset($this->_rules[$elementName])) {
      foreach ($this->_rules[$elementName] as $index => $ruleInfo) {
        if ($ruleInfo['type'] == 'uploadedfile') {
          unset($this->_rules[$elementName][$index]);
        }
      }
      if (empty($this->_rules[$elementName])) {
        unset($this->_rules[$elementName]);
      }
    }
  }

  /**
   * Function that can be defined in Form to override or
   * perform specific action on cancel action
   *
   * @access public
   */
  function cancelAction() {}

  /**
   * Helper function to verify that required fields have been filled
   * Typically called within the scope of a FormRule function
   */
  static function validateMandatoryFields($fields, $values, &$errors) {
    foreach ($fields as $name => $fld) {
      if (!empty($fld['is_required']) && CRM_Utils_System::isNull(CRM_Utils_Array::value($name, $values))) {
        $errors[$name] = ts('%1 is a required field.', array(1 => $fld['title']));
      }
    }
  }

/**
 * Get contact if for a form object. Prioritise
 *  - cid in URL if 0 (on behalf on someoneelse)
 *      (@todo consider setting a variable if onbehalf for clarity of downstream 'if's
 *  - logged in user id if it matches the one in the cid in the URL
 *  - contact id validated from a checksum from a checksum
 *  - cid from the url if the caller has ACL permission to view
 *  - fallback is logged in user (or ? NULL if no logged in user) (@todo wouldn't 0 be more intuitive?)
 *
 * @return Ambigous <mixed, NULL, value, unknown, array, number>|unknown
 */
  function getContactID() {
    $tempID = CRM_Utils_Request::retrieve('cid', 'Positive', $this);
    if(isset($this->_params) && isset($this->_params['select_contact_id'])) {
      $tempID = $this->_params['select_contact_id'];
    }
    if(isset($this->_params, $this->_params[0]) && !empty($this->_params[0]['select_contact_id'])) {
      // event form stores as an indexed array, contribution form not so much...
      $tempID = $this->_params[0]['select_contact_id'];
    }

    // force to ignore the authenticated user
    if ($tempID === '0' || $tempID === 0) {
      // we set the cid on the form so that this will be retained for the Confirm page
      // in the multi-page form & prevent us returning the $userID when this is called
      // from that page
      // we don't really need to set it when $tempID is set because the params have that stored
      $this->set('cid', 0);
      return $tempID;
    }

    $userID = $this->getLoggedInUserContactID();

    if ($tempID == $userID) {
      return $userID;
    }

    //check if this is a checksum authentication
    $userChecksum = CRM_Utils_Request::retrieve('cs', 'String', $this);
    if ($userChecksum) {
      //check for anonymous user.
      $validUser = CRM_Contact_BAO_Contact_Utils::validChecksum($tempID, $userChecksum);
      if ($validUser) {
        return $tempID;
      }
    }
    // check if user has permission, CRM-12062
    else if ($tempID && CRM_Contact_BAO_Contact_Permission::allow($tempID)) {
      return $tempID;
    }

    return $userID;
  }

 /**
  * Get the contact id of the logged in user
  */
  function getLoggedInUserContactID() {
    // check if the user is logged in and has a contact ID
    $session = CRM_Core_Session::singleton();
    return $session->get('userID');
  }

  /**
   * add autoselector field -if user has permission to view contacts
   * If adding this to a form you also need to add to the tpl e.g
   *
   * {if !empty($selectable)}
   * <div class="crm-summary-row">
   *   <div class="crm-label">{$form.select_contact.label}</div>
   *   <div class="crm-content">
   *     {$form.select_contact.html}
   *   </div>
   * </div>
   * {/if}
   * @param array $profiles ids of profiles that are on the form (to be autofilled)
   * @param array $field metadata of field to use as selector including
   *  - name_field
   *  - id_field
   *  - url (for ajax lookup)
   *
   *  @todo add data attributes so we can deal with multiple instances on a form
   */
  function addAutoSelector($profiles = array(), $autoCompleteField = array()) {
    $autoCompleteField = array_merge(array(
        'name_field' => 'select_contact',
        'id_field' => 'select_contact_id',
        'field_text' => ts('Select Contact'),
        'show_hide' => TRUE,
        'show_text' => ts('to select someone already in our database.'),
        'hide_text' => ts('to clear this person\'s information, and fill the form in for someone else'),
        'url' => array('civicrm/ajax/rest', 'className=CRM_Contact_Page_AJAX&fnName=getContactList&json=1'),
        'max' => civicrm_api3('setting', 'getvalue', array(
        'name' => 'search_autocomplete_count',
        'group' => 'Search Preferences',
        ))
      ), $autoCompleteField);

    if(0 < (civicrm_api3('contact', 'getcount', array('check_permissions' => 1)))) {
      $this->addElement('text', $autoCompleteField['name_field'] , $autoCompleteField['field_text']);
      $this->addElement('hidden',  $autoCompleteField['id_field'], '', array('id' => $autoCompleteField['id_field']));
      $this->assign('selectable', $autoCompleteField['id_field']);

      CRM_Core_Resources::singleton()->addScriptFile('civicrm', 'js/AutoComplete.js')
      ->addSetting(array(
      'form' => array('autocompletes' => $autoCompleteField),
      'ids' => array('profile' => $profiles),
      ));
    }
  }

  /**
   * Add the options appropriate to cid = zero - ie. autocomplete
   *
   * @todo there is considerable code duplication between the contribution forms & event forms. It is apparent
   * that small pieces of duplication are not being refactored into separate functions because their only shared parent
   * is this form. Inserting a class FrontEndForm.php between the contribution & event & this class would allow functions like this
   * and a dozen other small ones to be refactored into a shared parent with the reduction of much code duplication
   */
  function addCIDZeroOptions($onlinePaymentProcessorEnabled) {
    $this->assign('nocid', TRUE);
    $profiles = array();
    if($this->_values['custom_pre_id']) {
      $profiles[] = $this->_values['custom_pre_id'];
    }
    if($this->_values['custom_post_id']) {
      $profiles[] = $this->_values['custom_post_id'];
    }
    if($onlinePaymentProcessorEnabled) {
      $profiles[] = 'billing';
    }
    if(!empty($this->_values)) {
      $this->addAutoSelector($profiles);
    }
  }

  /**
   * Set default values on form for given contact (or no contact defaults)
   * @param mixed $profile_id (can be id, or profile name)
   * @param integer $contactID
   */
  function getProfileDefaults($profile_id = 'Billing', $contactID = NULL) {
    try{
      $defaults = civicrm_api3('profile', 'getsingle', array(
        'profile_id' => (array) $profile_id,
        'contact_id' => $contactID,
      ));
      return $defaults;
    }
    catch (Exception $e) {
      // the try catch block gives us silent failure -not 100% sure this is a good idea
      // as silent failures are often worse than noisy ones
      return array();
    }
  }
}