<?php
/*
 +--------------------------------------------------------------------+
 | CiviCRM version 4.3                                                |
 +--------------------------------------------------------------------+
 | 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        |
 +--------------------------------------------------------------------+
*/

/**
 *
 * @package CRM
 * @copyright CiviCRM LLC (c) 2004-2013
 * $Id$
 *
 */

/**
 * This class generates form components for Activity
 *
 */
class CRM_Activity_Form_Activity extends CRM_Contact_Form_Task {

  /**
   * The id of the object being edited / created
   *
   * @var int
   */
  public $_activityId;

  /**
   * store activity ids when multiple activities are created
   *
   * @var int
   */
  public $_activityIds = array();

  /**
   * The id of activity type
   *
   * @var int
   */
  public $_activityTypeId;

  /**
   * The name of activity type
   *
   * @var string
   */
  public $_activityTypeName;

  /**
   * The id of currently viewed contact
   *
   * @var int
   */
  public $_currentlyViewedContactId;

  /**
   * The id of source contact and target contact
   *
   * @var int
   */
  protected $_sourceContactId;
  protected $_targetContactId;
  protected $_asigneeContactId;

  protected $_single;

  public $_context;
  public $_compContext;
  public $_action;
  public $_activityTypeFile;

  /**
   * The id of the logged in user, used when add / edit
   *
   * @var int
   */
  public $_currentUserId;

  /**
   * The array of form field attributes
   *
   * @var array
   */
  public $_fields;

  /**
   * The the directory inside CRM, to include activity type file from
   *
   * @var string
   */
  protected $_crmDir = 'Activity';

  /*
     * Survey activity
     *
     * @var boolean
     */

  protected $_isSurveyActivity;

  protected $_values = array();

  /**
   * The _fields var can be used by sub class to set/unset/edit the
   * form fields based on their requirement
   *
   */
  function setFields() {
    $this->_fields = array(
      'subject' => array(
        'type' => 'text',
        'label' => ts('Subject'),
        'attributes' => CRM_Core_DAO::getAttribute('CRM_Activity_DAO_Activity',
          'subject'
        ),
      ),
      'duration' => array(
        'type' => 'text',
        'label' => ts('Duration'),
        'attributes' => array('size' => 4, 'maxlength' => 8),
        'required' => FALSE,
      ),
      'location' => array(
        'type' => 'text',
        'label' => ts('Location'),
        'attributes' =>
        CRM_Core_DAO::getAttribute('CRM_Activity_DAO_Activity',
          'location'
        ),
        'required' => FALSE
      ),
      'details' => array(
        'type' => 'wysiwyg',
        'label' => ts('Details'),
        // forces a smaller edit window
        'attributes' => array('rows' => 4, 'cols' => 60),
        'required' => FALSE
      ),
      'status_id' => array(
        'type' => 'select',
        'label' => ts('Status'),
        'attributes' =>
        CRM_Core_PseudoConstant::activityStatus(),
        'required' => TRUE
      ),
      'priority_id' => array(
        'type' => 'select',
        'label' => ts('Priority'),
        'attributes' =>
        CRM_Core_PseudoConstant::priority(),
        'required' => TRUE
      ),
      'source_contact_id' => array(
        'type' => 'text',
        'label' => ts('Added By'),
        'required' => FALSE
      ),
      'followup_activity_type_id' => array(
        'type' => 'select',
        'label' => ts('Followup Activity'),
        'attributes' => array(
          '' => '- ' . ts('select activity') . ' -') +
        CRM_Core_PseudoConstant::ActivityType(FALSE)
      ),
      // Add optional 'Subject' field for the Follow-up Activiity, CRM-4491
      'followup_activity_subject' => array(
        'type' => 'text',
        'label' => ts('Subject'),
        'attributes' => CRM_Core_DAO::getAttribute('CRM_Activity_DAO_Activity',
          'subject'
        )
      )
    );

    if (($this->_context == 'standalone') &&
      ($printPDF = CRM_Utils_Array::key('Print PDF Letter', $this->_fields['followup_activity_type_id']['attributes']))
    ) {
      unset($this->_fields['followup_activity_type_id']['attributes'][$printPDF]);
    }
  }

  /**
   * Function to build the form
   *
   * @return None
   * @access public
   */
  function preProcess() {
    $this->_cdType = CRM_Utils_Array::value('type', $_GET);
    $this->assign('cdType', FALSE);
    if ($this->_cdType) {
      $this->assign('cdType', TRUE);
      return CRM_Custom_Form_CustomData::preProcess($this);
    }

    $this->_atypefile = CRM_Utils_Array::value('atypefile', $_GET);
    $this->assign('atypefile', FALSE);
    if ($this->_atypefile) {
      $this->assign('atypefile', TRUE);
    }

    $session = CRM_Core_Session::singleton();
    $this->_currentUserId = $session->get('userID');

    $this->_currentlyViewedContactId = $this->get('contactId');
    if (!$this->_currentlyViewedContactId) {
      $this->_currentlyViewedContactId = CRM_Utils_Request::retrieve('cid', 'Positive', $this);
    }
    $this->assign('contactId', $this->_currentlyViewedContactId);

    if ($this->_currentlyViewedContactId) {
      CRM_Contact_Page_View::setTitle($this->_currentlyViewedContactId);
    }

    //give the context.
    if (!isset($this->_context)) {
      $this->_context = CRM_Utils_Request::retrieve('context', 'String', $this);
      if (CRM_Contact_Form_Search::isSearchContext($this->_context)) {
        $this->_context = 'search';
      }
      elseif (!in_array($this->_context, array('dashlet', 'dashletFullscreen'))
        && $this->_currentlyViewedContactId
      ) {
        $this->_context = 'activity';
      }
      $this->_compContext = CRM_Utils_Request::retrieve('compContext', 'String', $this);
    }

    $this->assign('context', $this->_context);

    $this->_action = CRM_Utils_Request::retrieve('action', 'String', $this);

    if ($this->_action & CRM_Core_Action::DELETE) {
      if (!CRM_Core_Permission::check('delete activities')) {
        CRM_Core_Error::fatal(ts('You do not have permission to access this page'));
      }
    }

    //CRM-6957
    //when we come from contact search, activity id never comes.
    //so don't try to get from object, it might gives you wrong one.

    // if we're not adding new one, there must be an id to
    // an activity we're trying to work on.
    if ($this->_action != CRM_Core_Action::ADD &&
      get_class($this->controller) != 'CRM_Contact_Controller_Search'
    ) {
      $this->_activityId = CRM_Utils_Request::retrieve('id', 'Positive', $this);
    }

    $this->_activityTypeId = CRM_Utils_Request::retrieve('atype', 'Positive', $this);
    $this->assign('atype', $this->_activityTypeId);

    //check for required permissions, CRM-6264
    if ($this->_activityId &&
      in_array($this->_action, array(
        CRM_Core_Action::UPDATE, CRM_Core_Action::VIEW)) &&
      !CRM_Activity_BAO_Activity::checkPermission($this->_activityId, $this->_action)
    ) {
      CRM_Core_Error::fatal(ts('You do not have permission to access this page.'));
    }
    if (($this->_action & CRM_Core_Action::VIEW) &&
      CRM_Activity_BAO_Activity::checkPermission($this->_activityId, CRM_Core_Action::UPDATE)
    ) {
      $this->assign('permission', 'edit');
    }

    if (!$this->_activityTypeId && $this->_activityId) {
      $this->_activityTypeId = CRM_Core_DAO::getFieldValue('CRM_Activity_DAO_Activity',
        $this->_activityId,
        'activity_type_id'
      );
    }

    //Assigning Activity type name
    if ($this->_activityTypeId) {
      $activityTName = CRM_Core_OptionGroup::values('activity_type', FALSE, FALSE, FALSE, 'AND v.value = ' . $this->_activityTypeId, 'name');
      if ($activityTName[$this->_activityTypeId]) {
        $this->_activityTypeName = $activityTName[$this->_activityTypeId];
        $this->assign('activityTName', $activityTName[$this->_activityTypeId]);
      }
    }

    // Assign pageTitle to be "Activity - "+ activity name
    if (isset($activityTName)) {
    $pageTitle = 'Activity - ' . CRM_Utils_Array::value($this->_activityTypeId, $activityTName);
    $this->assign('pageTitle', $pageTitle);
    }

    //check the mode when this form is called either single or as
    //search task action
    if ($this->_activityTypeId ||
      $this->_context == 'standalone' ||
      $this->_currentlyViewedContactId
    ) {
      $this->_single = TRUE;
      $this->assign('urlPath', 'civicrm/activity');
    }
    else {
      //set the appropriate action
      $url = CRM_Utils_System::currentPath();
      $urlArray = explode('/', $url);
      $seachPath = array_pop($urlArray);
      $searchType = 'basic';
      $this->_action = CRM_Core_Action::BASIC;
      switch ($seachPath) {
        case 'basic':
          $searchType = $seachPath;
          $this->_action = CRM_Core_Action::BASIC;
          break;

        case 'advanced':
          $searchType = $seachPath;
          $this->_action = CRM_Core_Action::ADVANCED;
          break;

        case 'builder':
          $searchType = $seachPath;
          $this->_action = CRM_Core_Action::PROFILE;
          break;

        case 'custom':
          $this->_action = CRM_Core_Action::COPY;
          $searchType = $seachPath;
          break;
      }

      parent::preProcess();
      $this->_single = FALSE;

      $this->assign('urlPath', "civicrm/contact/search/$searchType");
      $this->assign('urlPathVar', "_qf_Activity_display=true&qfKey={$this->controller->_key}");
    }

    $this->assign('single', $this->_single);
    $this->assign('action', $this->_action);

    if ($this->_action & CRM_Core_Action::VIEW) {
      // get the tree of custom fields
      $this->_groupTree = &CRM_Core_BAO_CustomGroup::getTree('Activity', $this,
        $this->_activityId, 0, $this->_activityTypeId
      );
    }

    if ($this->_activityTypeId) {
      //set activity type name and description to template
      list($this->_activityTypeName, $activityTypeDescription) = CRM_Core_BAO_OptionValue::getActivityTypeDetails($this->_activityTypeId);
      $this->assign('activityTypeName', $this->_activityTypeName);
      $this->assign('activityTypeDescription', $activityTypeDescription);
    }

    // set user context
    $urlParams = $urlString = NULL;
    $qfKey = CRM_Utils_Request::retrieve('key', 'String', $this);
    if (!$qfKey) {
      $qfKey = CRM_Utils_Request::retrieve('qfKey', 'String', $this);
    }

    //validate the qfKey
    if (!CRM_Utils_Rule::qfKey($qfKey)) {
      $qfKey = NULL;
    }

    if ($this->_context == 'fulltext') {
      $keyName   = '&qfKey';
      $urlParams = 'force=1';
      $urlString = 'civicrm/contact/search/custom';
      if ($this->_action == CRM_Core_Action::UPDATE) {
        $keyName = '&key';
        $urlParams .= '&context=fulltext&action=view';
        $urlString = 'civicrm/contact/view/activity';
      }
      if ($qfKey) {
        $urlParams .= "$keyName=$qfKey";
      }
      $this->assign('searchKey', $qfKey);
    }
    elseif (in_array($this->_context, array(
      'standalone', 'home', 'dashlet', 'dashletFullscreen'))) {
      $urlParams = 'reset=1';
      $urlString = 'civicrm/dashboard';
    }
    elseif ($this->_context == 'search') {
      $urlParams = 'force=1';
      if ($qfKey) {
        $urlParams .= "&qfKey=$qfKey";
      }
      $path = CRM_Utils_System::currentPath();
      if ($this->_compContext == 'advanced' || 
        $path == 'civicrm/contact/search/advanced') {
        $urlString = 'civicrm/contact/search/advanced';
      }
      else if ($path == 'civicrm/contact/search') {
        $urlString = 'civicrm/contact/search';
      }
      else {
        $urlString = 'civicrm/activity/search';
      }
      $this->assign('searchKey', $qfKey);
    }
    elseif ($this->_context != 'caseActivity') {
      $urlParams = "action=browse&reset=1&cid={$this->_currentlyViewedContactId}&selectedChild=activity";
      $urlString = 'civicrm/contact/view';
    }

    if ($urlString) {
      $session->pushUserContext(CRM_Utils_System::url($urlString, $urlParams));
    }

    // hack to retrieve activity type id from post variables
    if (!$this->_activityTypeId) {
      $this->_activityTypeId = CRM_Utils_Array::value('activity_type_id', $_POST);
    }

    // when custom data is included in this page
    if (CRM_Utils_Array::value('hidden_custom', $_POST)) {
      // we need to set it in the session for the below code to work
      // CRM-3014
      //need to assign custom data subtype to the template
      $this->set('type', 'Activity');
      $this->set('subType', $this->_activityTypeId);
      $this->set('entityId', $this->_activityId);
      CRM_Custom_Form_CustomData::preProcess($this);
      CRM_Custom_Form_CustomData::buildQuickForm($this);
      CRM_Custom_Form_CustomData::setDefaultValues($this);
    }

    // add attachments part
    CRM_Core_BAO_File::buildAttachment($this, 'civicrm_activity', $this->_activityId, NULL, TRUE);

    // figure out the file name for activity type, if any
    if ($this->_activityTypeId &&
      $this->_activityTypeFile =
      CRM_Activity_BAO_Activity::getFileForActivityTypeId($this->_activityTypeId, $this->_crmDir)
    ) {
      $this->assign('activityTypeFile', $this->_activityTypeFile);
      $this->assign('crmDir', $this->_crmDir);
    }

    $this->setFields();

    if ($this->_activityTypeFile) {
      eval("CRM_{$this->_crmDir}_Form_Activity_{$this->_activityTypeFile}::preProcess( \$this );");
    }

    $this->_values = $this->get('values');
    if (!is_array($this->_values)) {
      $this->_values = array();
      if (isset($this->_activityId) && $this->_activityId) {
        $params = array('id' => $this->_activityId);
        CRM_Activity_BAO_Activity::retrieve($params, $this->_values);
      }
      $this->set('values', $this->_values);
    }
  }

  /**
   * This function sets the default values for the form. For edit/view mode
   * the default values are retrieved from the database
   *
   * @access public
   *
   * @return None
   */
  function setDefaultValues() {
    if ($this->_cdType) {
      return CRM_Custom_Form_CustomData::setDefaultValues($this);
    }

    $defaults = $this->_values;

    // if we're editing...
    if (isset($this->_activityId)) {
      $defaults['source_contact_qid'] = CRM_Utils_Array::value( 'source_contact_id',
        $defaults );
      $defaults['source_contact_id']  = CRM_Utils_Array::value( 'source_contact',
        $defaults );

      if (!CRM_Utils_Array::crmIsEmptyArray($defaults['target_contact'])) {
        $target_contact_value = explode(';', trim($defaults['target_contact_value']));
        $target_contact = array_combine(array_unique($defaults['target_contact']), $target_contact_value);

        if ($this->_action & CRM_Core_Action::VIEW) {
          $this->assign('target_contact', $target_contact);
        }
        else {
          //this assigned variable is used by newcontact creation widget to set defaults
          $this->assign('prePopulateData', $this->formatContactValues($target_contact));
        }
      }

      if (!CRM_Utils_Array::crmIsEmptyArray($defaults['assignee_contact'])) {
        $assignee_contact_value = explode(';', trim($defaults['assignee_contact_value']));
        $assignee_contact = array_combine($defaults['assignee_contact'], $assignee_contact_value);

        if ($this->_action & CRM_Core_Action::VIEW) {
          $this->assign('assignee_contact', $assignee_contact);
        }
        else {
          $this->assign('assignee_contact', $this->formatContactValues($assignee_contact));
        }
      }

      if (!CRM_Utils_Array::value('activity_date_time', $defaults)) {
        list($defaults['activity_date_time'], $defaults['activity_date_time_time']) = CRM_Utils_Date::setDateDefaults(NULL, 'activityDateTime');
      }
      elseif ($this->_action & CRM_Core_Action::UPDATE) {
        $this->assign('current_activity_date_time', $defaults['activity_date_time']);
        list($defaults['activity_date_time'],
          $defaults['activity_date_time_time']
        ) = CRM_Utils_Date::setDateDefaults($defaults['activity_date_time'], 'activityDateTime');
      }

      //set the assigneed contact count to template
      if (!empty($defaults['assignee_contact'])) {
        $this->assign('assigneeContactCount', count($defaults['assignee_contact']));
      }
      else {
        $this->assign('assigneeContactCount', 1);
      }

      //set the target contact count to template
      if (!empty($defaults['target_contact'])) {
        $this->assign('targetContactCount', count($defaults['target_contact']));
      }
      else {
        $this->assign('targetContactCount', 1);
      }

      if ($this->_context != 'standalone') {
        $this->assign('target_contact_value',
          CRM_Utils_Array::value('target_contact_value', $defaults)
        );
        $this->assign('assignee_contact_value',
          CRM_Utils_Array::value('assignee_contact_value', $defaults)
        );
        $this->assign('source_contact_value',
          CRM_Utils_Array::value('source_contact', $defaults)
        );
      }

      // set default tags if exists
      $defaults['tag'] = CRM_Core_BAO_EntityTag::getTag($this->_activityId, 'civicrm_activity');
    }
    else {
      // if it's a new activity, we need to set default values for associated contact fields
      // since those are jQuery fields, unfortunately we cannot use defaults directly
      $this->_sourceContactId = $this->_currentUserId;
      $this->_targetContactId = $this->_currentlyViewedContactId;
      $target_contact = array();

      $defaults['source_contact_id'] = self::_getDisplayNameById($this->_sourceContactId);
      $defaults['source_contact_qid'] = $this->_sourceContactId;
      if ($this->_context != 'standalone' && isset($this->_targetContactId)) {
        $target_contact[$this->_targetContactId] = self::_getDisplayNameById($this->_targetContactId);
      }

      //this assigned variable is used by newcontact creation widget to set defaults
      $this->assign('prePopulateData', $this->formatContactValues($target_contact));

      list($defaults['activity_date_time'], $defaults['activity_date_time_time']) =
        CRM_Utils_Date::setDateDefaults(NULL, 'activityDateTime');
    }

    if ($this->_activityTypeId) {
      $defaults['activity_type_id'] = $this->_activityTypeId;
    }

    if ($this->_action & (CRM_Core_Action::DELETE | CRM_Core_Action::RENEW)) {
      $this->assign('delName', CRM_Utils_Array::value('subject', $defaults));
    }

    if ($this->_activityTypeFile) {
      eval('$defaults += CRM_' . $this->_crmDir . '_Form_Activity_' .
        $this->_activityTypeFile . '::setDefaultValues($this);'
      );
    }
    if (!CRM_Utils_Array::value('priority_id', $defaults)) {
      $priority = CRM_Core_PseudoConstant::priority();
      $defaults['priority_id'] = array_search('Normal', $priority);
    }
    return $defaults;
  }

  /**
   * Function to format contact values before assigning to autocomplete widget
   *
   * @param array $contactNames associated array of contact name and ids
   *
   * @return json encoded object
   * @private
   */
  function formatContactValues(&$contactNames) {
    //format target/assignee contact
    $formatContacts = array();
    foreach ($contactNames as $id => $name) {
      $formatContacts[] = array(
        'id' => $id,
        'name' => $name
      );
    }

    return json_encode($formatContacts);
  }

  public function buildQuickForm() {
    if ($this->_action & (CRM_Core_Action::DELETE | CRM_Core_Action::RENEW)) {
      //enable form element (ActivityLinks sets this true)
      $this->assign('suppressForm', FALSE);

      $button = ts('Delete');
      if ($this->_action & CRM_Core_Action::RENEW) {
        $button = ts('Restore');
      }
      $this->addButtons(array(
          array(
            'type' => 'next',
            'name' => $button,
            'spacing' => '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;',
            'isDefault' => TRUE
          ),
          array(
            'type' => 'cancel',
            'name' => ts('Cancel')
          )
        ));
      return;
    }

    if (!$this->_single && !empty($this->_contactIds)) {
      $withArray = array();
      foreach ($this->_contactIds as $contactId) {
        $withDisplayName = self::_getDisplayNameById($contactId);
        $withArray[] = "\"$withDisplayName\" ";
      }
      $this->assign('with', implode(', ', $withArray));
    }

    if ($this->_cdType) {
      return CRM_Custom_Form_CustomData::buildQuickForm($this);
    }

    //build other activity links
    CRM_Activity_Form_ActivityLinks::commonBuildQuickForm($this);

    //enable form element (ActivityLinks sets this true)
    $this->assign('suppressForm', FALSE);

    $element = &$this->add('select', 'activity_type_id', ts('Activity Type'),
      $this->_fields['followup_activity_type_id']['attributes'],
      FALSE, array(
        'onchange' =>
        "CRM.buildCustomData( 'Activity', this.value );",
      )
    );

    //freeze for update mode.
    if ($this->_action & CRM_Core_Action::UPDATE) {
      $element->freeze();
    }

    foreach ($this->_fields as $field => $values) {
      if (CRM_Utils_Array::value($field, $this->_fields)) {
        $attribute = NULL;
        if (CRM_Utils_Array::value('attributes', $values)) {
          $attribute = $values['attributes'];
        }

        $required = FALSE;
        if (CRM_Utils_Array::value('required', $values)) {
          $required = TRUE;
        }
        if ($values['type'] == 'wysiwyg') {
          $this->addWysiwyg($field, $values['label'], $attribute, $required);
        }
        else {
          $this->add($values['type'], $field, $values['label'], $attribute, $required);
        }
      }
    }

    //CRM-7362 --add campaigns.
    CRM_Campaign_BAO_Campaign::addCampaign($this, CRM_Utils_Array::value('campaign_id', $this->_values));

    //add engagement level CRM-7775
    $buildEngagementLevel = FALSE;
    if (CRM_Campaign_BAO_Campaign::isCampaignEnable() &&
      CRM_Campaign_BAO_Campaign::accessCampaign()
    ) {
      $buildEngagementLevel = TRUE;
      $this->add('select', 'engagement_level',
        ts('Engagement Index'),
        array('' => ts('- select -')) + CRM_Campaign_PseudoConstant::engagementLevel()
      );
      $this->addRule('engagement_level',
        ts('Please enter the engagement index as a number (integers only).'),
        'positiveInteger'
      );
    }
    $this->assign('buildEngagementLevel', $buildEngagementLevel);

    // check for survey activity
    $this->_isSurveyActivity = FALSE;

    if ($this->_activityId && CRM_Campaign_BAO_Campaign::isCampaignEnable() &&
      CRM_Campaign_BAO_Campaign::accessCampaign()
    ) {

      $this->_isSurveyActivity = CRM_Campaign_BAO_Survey::isSurveyActivity($this->_activityId);
      if ($this->_isSurveyActivity) {
        $surveyId = CRM_Core_DAO::getFieldValue('CRM_Activity_DAO_Activity',
          $this->_activityId,
          'source_record_id'
        );
        $responseOptions = CRM_Campaign_BAO_Survey::getResponsesOptions($surveyId);
        if ($responseOptions) {
          $this->add('select', 'result', ts('Result'),
            array('' => ts('- select -')) + array_combine($responseOptions, $responseOptions)
          );
        }
        $surveyTitle = NULL;
        if ($surveyId) {
          $surveyTitle = CRM_Core_DAO::getFieldValue('CRM_Campaign_DAO_Survey', $surveyId, 'title');
        }
        $this->assign('surveyTitle', $surveyTitle);
      }
    }
    $this->assign('surveyActivity', $this->_isSurveyActivity);

    // this option should be available only during add mode
    if ($this->_action != CRM_Core_Action::UPDATE) {
      $this->add('advcheckbox', 'is_multi_activity', ts('Create a separate activity for each of the above selected contact.'));
    }

    $this->addRule('duration',
      ts('Please enter the duration as number of minutes (integers only).'), 'positiveInteger'
    );
    $this->addDateTime('activity_date_time', ts('Date'), TRUE, array('formatType' => 'activityDateTime'));

    //add followup date
    $this->addDateTime('followup_date', ts('in'));

    //autocomplete url
    $dataUrl = CRM_Utils_System::url("civicrm/ajax/rest",
      "className=CRM_Contact_Page_AJAX&fnName=getContactList&json=1&context=activity&reset=1",
      FALSE, NULL, FALSE
    );
    $this->assign('dataUrl', $dataUrl);

    //tokeninput url
    $tokenUrl = CRM_Utils_System::url("civicrm/ajax/checkemail",
      "noemail=1",
      FALSE, NULL, FALSE
    );
    $this->assign('tokenUrl', $tokenUrl);

    $admin = CRM_Core_Permission::check('administer CiviCRM');
    //allow to edit sourcecontactfield field if context is civicase.
    if ($this->_context == 'caseActivity') {
      $admin = TRUE;
    }

    $this->assign('admin', $admin);

    $sourceContactField = &$this->add($this->_fields['source_contact_id']['type'],
      'source_contact_id',
      $this->_fields['source_contact_id']['label'],
      NULL,
      $admin
    );

    $this->add('hidden', 'source_contact_qid', '', array('id' => 'source_contact_qid'));
    CRM_Contact_Form_NewContact::buildQuickForm($this);

    $this->add('text', 'assignee_contact_id', ts('assignee'));

    if ($sourceContactField->getValue()) {
      $this->assign('source_contact', $sourceContactField->getValue());
    }
    elseif ($this->_currentUserId) {
      // we're setting currently LOGGED IN user as source for this activity
      $this->assign('source_contact_value', self::_getDisplayNameById($this->_currentUserId));
    }

    //need to assign custom data type and subtype to the template
    $this->assign('customDataType', 'Activity');
    $this->assign('customDataSubType', $this->_activityTypeId);
    $this->assign('entityID', $this->_activityId);

    $tags = CRM_Core_BAO_Tag::getTags('civicrm_activity');

    if (!empty($tags)) {
      $this->add('select', 'tag', ts('Tags'), $tags, FALSE,
        array('id' => 'tags', 'multiple' => 'multiple', 'title' => ts('- select -'))
      );
    }

    // we need to hide activity tagset for special activities
    $specialActivities = array('Open Case');

    if (!in_array($this->_activityTypeName, $specialActivities)) {
      // build tag widget
      $parentNames = CRM_Core_BAO_Tag::getTagSet('civicrm_activity');
      CRM_Core_Form_Tag::buildQuickForm($this, $parentNames, 'civicrm_activity', $this->_activityId, FALSE, TRUE);
    }

    // if we're viewing, we're assigning different buttons than for adding/editing
    if ($this->_action & CRM_Core_Action::VIEW) {
      if (isset($this->_groupTree)) {
        CRM_Core_BAO_CustomGroup::buildCustomDataView($this, $this->_groupTree);
      }
      $buttons = array();
      // do check for permissions
      if (CRM_Case_BAO_Case::checkPermission($this->_activityId, 'File On Case', $this->_activityTypeId)) {
        $buttons[] = array(
          'type' => 'cancel',
          'name' => ts('File on case'),
          'subName' => 'file_on_case',
          'js' => array('onClick' => "javascript:fileOnCase( \"file\", $this->_activityId ); return false;")
        );
      }
      // form should be frozen for view mode
      $this->freeze();

      $buttons[] = array(
        'type' => 'cancel',
        'name' => ts('Done')
      );

      $this->addButtons($buttons);
    }
    else {
      $message = array('completed' => ts('Are you sure? This is a COMPLETED activity with the DATE in the FUTURE. Click Cancel to change the date / status. Otherwise, click OK to save.'),
        'scheduled' => ts('Are you sure? This is a SCHEDULED activity with the DATE in the PAST. Click Cancel to change the date / status. Otherwise, click OK to save.'),
      );
      $js = array('onclick' => "return activityStatus(" . json_encode($message) . ");");
      $this->addButtons(array(
          array(
            'type' => 'upload',
            'name' => ts('Save'),
            'js' => $js,
            'isDefault' => TRUE
          ),
          array(
            'type' => 'cancel',
            'name' => ts('Cancel')
          )
        )
      );
    }

    if ($this->_activityTypeFile) {
      eval("CRM_{$this->_crmDir}_Form_Activity_{$this->_activityTypeFile}::buildQuickForm( \$this );");
    }

    if ($this->_activityTypeFile) {
      eval('$this->addFormRule' .
        "(array(
          'CRM_{$this->_crmDir}_Form_Activity_{$this->_activityTypeFile}', 'formrule'), \$this);"
      );
    }

    $this->addFormRule(array('CRM_Activity_Form_Activity', 'formRule'), $this);
  }

  /**
   * global form rule
   *
   * @param array $fields  the input form values
   * @param array $files   the uploaded files if any
   * @param array $options additional user data
   *
   * @return true if no errors, else array of errors
   * @access public
   * @static
   */
  static function formRule($fields, $files, $self) {
    // skip form rule if deleting
    if (CRM_Utils_Array::value('_qf_Activity_next_', $fields) == 'Delete') {
      return TRUE;
    }
    $errors = array();
    if (!$self->_single && !$fields['activity_type_id']) {
      $errors['activity_type_id'] = ts('Activity Type is a required field');
    }

    //Activity type is mandatory if creating new activity, CRM-4515
    if (array_key_exists('activity_type_id', $fields) &&
      !CRM_Utils_Array::value('activity_type_id', $fields)
    ) {
      $errors['activity_type_id'] = ts('Activity Type is required field.');
    }
    //FIX me temp. comment
    // make sure if associated contacts exist

    if ($fields['source_contact_id'] && !is_numeric($fields['source_contact_qid'])) {
      $errors['source_contact_id'] = ts('Source Contact non-existent!');
    }

    if (CRM_Utils_Array::value('activity_type_id', $fields) == 3 &&
      CRM_Utils_Array::value('status_id', $fields) == 1
    ) {
      $errors['status_id'] = ts('You cannot record scheduled email activity.');
    }
    elseif (CRM_Utils_Array::value('activity_type_id', $fields) == 4 &&
      CRM_Utils_Array::value('status_id', $fields) == 1
    ) {
      $errors['status_id'] = ts('You cannot record scheduled SMS activity.');
    }

    if (CRM_Utils_Array::value('followup_activity_type_id', $fields) && !CRM_Utils_Array::value('followup_date', $fields)) {
      $errors['followup_date_time'] = ts('Followup date is a required field.');
    }
    //Activity type is mandatory if subject or follow-up date is specified for an Follow-up activity, CRM-4515
    if ((CRM_Utils_Array::value('followup_activity_subject', $fields) || CRM_Utils_Array::value('followup_date', $fields)) &&
      !CRM_Utils_Array::value('followup_activity_type_id', $fields)
    ) {
      $errors['followup_activity_subject'] = ts('Follow-up Activity type is a required field.');
    }
    return $errors;
  }

  /**
   * Function to process the form
   *
   * @access public
   *
   * @return None
   */
  public function postProcess($params = NULL) {
    if ($this->_action & CRM_Core_Action::DELETE) {
      $deleteParams = array('id' => $this->_activityId);
      $moveToTrash = CRM_Case_BAO_Case::isCaseActivity($this->_activityId);
      CRM_Activity_BAO_Activity::deleteActivity($deleteParams, $moveToTrash);

      // delete tags for the entity
      $tagParams = array(
        'entity_table' => 'civicrm_activity',
        'entity_id' => $this->_activityId
      );

      CRM_Core_BAO_EntityTag::del($tagParams);

      CRM_Core_Session::setStatus(ts("Selected Activity has been deleted successfully."), ts('Record Deleted'), 'success');
      return;
    }

    // store the submitted values in an array
    if (!$params) {
      $params = $this->controller->exportValues($this->_name);
    }

    //set activity type id
    if (!CRM_Utils_Array::value('activity_type_id', $params)) {
      $params['activity_type_id'] = $this->_activityTypeId;
    }

    if (CRM_Utils_Array::value('hidden_custom', $params) &&
      !isset($params['custom'])
    ) {
      $customFields = CRM_Core_BAO_CustomField::getFields('Activity', FALSE, FALSE,
        $this->_activityTypeId
      );
      $customFields = CRM_Utils_Array::crmArrayMerge($customFields,
        CRM_Core_BAO_CustomField::getFields('Activity', FALSE, FALSE,
          NULL, NULL, TRUE
        )
      );
      $params['custom'] = CRM_Core_BAO_CustomField::postProcess($params,
        $customFields,
        $this->_activityId,
        'Activity'
      );
    }

    // store the date with proper format
    $params['activity_date_time'] = CRM_Utils_Date::processDate($params['activity_date_time'], $params['activity_date_time_time']);

    // format with contact (target contact) values
    if (isset($params['contact'][1])) {
      $params['target_contact_id'] = explode(',', $params['contact'][1]);
    }
    else {
      $params['target_contact_id'] = array();
    }

    // assigning formated value to related variable
    if (CRM_Utils_Array::value('assignee_contact_id', $params)) {
      $params['assignee_contact_id'] = explode(',', $params['assignee_contact_id']);
    }
    else {
      $params['assignee_contact_id'] = array();
    }

    // get ids for associated contacts
    if (!$params['source_contact_id']) {
      $params['source_contact_id'] = $this->_currentUserId;
    }
    else {
      $params['source_contact_id'] = $this->_submitValues['source_contact_qid'];
    }

    if (isset($this->_activityId)) {
      $params['id'] = $this->_activityId;
    }

    // add attachments as needed
    CRM_Core_BAO_File::formatAttachment($params,
      $params,
      'civicrm_activity',
      $this->_activityId
    );

    // format target params
    if (!$this->_single) {
      $params['target_contact_id'] = $this->_contactIds;
    }

    $activity = array();
    if (CRM_Utils_Array::value('is_multi_activity', $params) &&
      !CRM_Utils_Array::crmIsEmptyArray($params['target_contact_id'])
    ) {
      $targetContacts = $params['target_contact_id'];
      foreach($targetContacts as $targetContactId) {
        $params['target_contact_id'] = array($targetContactId);
        // save activity
        $activity[] = $this->processActivity($params);
      }
    }
    else {
      // save activity
      $activity = $this->processActivity($params);
    }

    return array('activity' => $activity);
  }

  /**
   * Process activity creation
   *
   * @param array $params associated array of submitted values
   * @access protected
   */
  protected function processActivity(&$params) {
    $activityAssigned = array();
    // format assignee params
    if (!CRM_Utils_Array::crmIsEmptyArray($params['assignee_contact_id'])) {
      //skip those assignee contacts which are already assigned
      //while sending a copy.CRM-4509.
      $activityAssigned = array_flip($params['assignee_contact_id']);
      if ($this->_activityId) {
        $assigneeContacts = CRM_Activity_BAO_ActivityAssignment::getAssigneeNames($this->_activityId);
        $activityAssigned = array_diff_key($activityAssigned, $assigneeContacts);
      }
    }

    // call begin post process. Idea is to let injecting file do
    // any processing before the activity is added/updated.
    $this->beginPostProcess($params);

    $activity = CRM_Activity_BAO_Activity::create($params);

    // add tags if exists
    $tagParams = array();
    if (!empty($params['tag'])) {
      foreach ($params['tag'] as $tag) {
        $tagParams[$tag] = 1;
      }
    }

    //save static tags
    CRM_Core_BAO_EntityTag::create($tagParams, 'civicrm_activity', $activity->id);

    //save free tags
    if (isset($params['activity_taglist']) && !empty($params['activity_taglist'])) {
      CRM_Core_Form_Tag::postProcess($params['activity_taglist'], $activity->id, 'civicrm_activity', $this);
    }

    // call end post process. Idea is to let injecting file do any
    // processing needed, after the activity has been added/updated.
    $this->endPostProcess($params, $activity);

    // CRM-9590
    if (CRM_Utils_Array::value('is_multi_activity', $params)) {
      $this->_activityIds[] = $activity->id;
    }
    else {
      $this->_activityId = $activity->id;
    }

    // create follow up activity if needed
    $followupStatus = '';
    if (CRM_Utils_Array::value('followup_activity_type_id', $params)) {
      CRM_Activity_BAO_Activity::createFollowupActivity($activity->id, $params);
      $followupStatus = ts('A followup activity has been scheduled.');
    }

    // send copy to assignee contacts.CRM-4509
    $mailStatus = '';

    if (!CRM_Utils_Array::crmIsEmptyArray($params['assignee_contact_id']) &&
      CRM_Core_BAO_Setting::getItem(CRM_Core_BAO_Setting::SYSTEM_PREFERENCES_NAME,
        'activity_assignee_notification'
      )
    ) {
      $mailToContacts = array();
      $assigneeContacts = CRM_Activity_BAO_ActivityAssignment::getAssigneeNames($activity->id, TRUE, FALSE);

      //build an associative array with unique email addresses.
      foreach ($activityAssigned as $id => $dnc) {
        if (isset($id) && array_key_exists($id, $assigneeContacts)) {
          $mailToContacts[$assigneeContacts[$id]['email']] = $assigneeContacts[$id];
        }
      }

      if (!CRM_Utils_array::crmIsEmptyArray($mailToContacts)) {
        //include attachments while sendig a copy of activity.
        $attachments = CRM_Core_BAO_File::getEntityFile('civicrm_activity', $activity->id);

        $ics = new CRM_Activity_BAO_ICalendar( $activity );
        $ics->addAttachment( $attachments, $mailToContacts );

        // CRM-8400 add param with _currentlyViewedContactId for URL link in mail
        CRM_Case_BAO_Case::sendActivityCopy(NULL, $activity->id, $mailToContacts, $attachments, NULL);

        $ics->cleanup();

        $mailStatus .= ts("A copy of the activity has also been sent to assignee contacts(s).");
      }
    }

    // set status message
    $subject = '';
    if (CRM_Utils_Array::value('subject', $params)) {
      $subject = "'" . $params['subject'] . "'";
    }

    CRM_Core_Session::setStatus(ts('Activity %1 has been saved. %2. %3',
      array(
        1 => $subject,
        2 => $followupStatus,
        3 => $mailStatus
      )
    ), ts('Saved'), 'success');

    return $activity;
  }

  /**
   * Shorthand for getting id by display name (makes code more readable)
   *
   * @access protected
   */
  protected function _getIdByDisplayName($displayName) {
    return CRM_Core_DAO::getFieldValue('CRM_Contact_DAO_Contact',
      $displayName,
      'id',
      'sort_name'
    );
  }

  /**
   * Shorthand for getting display name by id (makes code more readable)
   *
   * @access protected
   */
  protected function _getDisplayNameById($id) {
    return CRM_Core_DAO::getFieldValue('CRM_Contact_DAO_Contact',
      $id,
      'sort_name',
      'id'
    );
  }

  /**
   * Function to let injecting activity type file do any processing
   * needed, before the activity is added/updated
   *
   */
  function beginPostProcess(&$params) {
    if ($this->_activityTypeFile) {
      eval("CRM_{$this->_crmDir}_Form_Activity_{$this->_activityTypeFile}" .
        "::beginPostProcess( \$this, \$params );"
      );
    }
  }

  /**
   * Function to let injecting activity type file do any processing
   * needed, after the activity has been added/updated
   *
   */
  function endPostProcess(&$params, &$activity) {
    if ($this->_activityTypeFile) {
      eval("CRM_{$this->_crmDir}_Form_Activity_{$this->_activityTypeFile}" .
        "::endPostProcess( \$this, \$params, \$activity );"
      );
    }
  }
}