priceconditionfields.php

<?php

require_once 'priceconditionfields.civix.php';

use CRM_Priceconditionfields_ExtensionUtil as E;

/**
 * Implements hook_civicrm_config().
 *
 * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_config/
 */
function priceconditionfields_civicrm_config(&$config): void {
  _priceconditionfields_civix_civicrm_config($config);
}

/**
 * Implements hook_civicrm_install().
 *
 * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_install
 */
function priceconditionfields_civicrm_install(): void {
  _priceconditionfields_civix_civicrm_install();
}

/**
 * Implements hook_civicrm_enable().
 *
 * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_enable
 */
function priceconditionfields_civicrm_enable(): void {
  _priceconditionfields_civix_civicrm_enable();
}

/**
 * Implements hook_civicrm_buildForm().
 */
function priceconditionfields_civicrm_buildForm($fname, &$form) {
  if (in_array($fname, ['CRM_Price_Form_Field'])) {
    if ($form->_action & CRM_Core_Action::UPDATE) {
      $domainID = CRM_Core_Config::domainID();
      $settings = Civi::settings($domainID);
      // Add participant type element
      $form->add('select', 'participant_type_condition', E::ts('Participant Type'), [
        '' => E::ts('- Select -'),
        'all_participants' => E::ts('All Participants'),
        'primary_participant' => E::ts('Primary Participant Only'),
        'additional_participant' => E::ts('Additional Participant Only'),
      ], FALSE, ['class' => 'crm-select2']);

      $form->setDefaults(['participant_type_condition' => $settings->get('participant_type_condition_fid_' . $form->getVar('_fid'))]);
    }
  }
}

/**
 * Implementation of hook_civicrm_postProcess()
 */
function priceconditionfields_civicrm_postProcess($class, &$form) {
  if (in_array($class, ['CRM_Price_Form_Field'])) {
    $domainID = CRM_Core_Config::domainID();
    $settings = Civi::settings($domainID);
    if ($form->getVar('_fid')) {
      $id = $form->getVar('_fid');
    }
    if ($id) {
      $participant_type_condition = $form->_submitValues['participant_type_condition'] ?? NULL;
      $domainID = CRM_Core_Config::domainID();
      $settings = Civi::settings($domainID);
      $settings->set('participant_type_condition_fid_' . $id, $participant_type_condition);
    }
  }
}

/**
 * Implements hook_civicrm_buildAmount().
 *
 * Filter price fields based on participant type during event registration
 */
function priceconditionfields_civicrm_buildAmount($pageType, &$form, &$amount) {
  // Determine if this is an event registration form and what participant type we're dealing with
  if ($pageType === 'event') {
    _priceconditionfields_filter_price_fields($form, $amount);
  }
}

/**
 * Filter price fields based on current participant type
 */
function _priceconditionfields_filter_price_fields(&$form, &$amount) {
  // Determine participant type for current registration
  $participantType = _priceconditionfields_get_current_participant_type($form);
  if (!$participantType) {
    return;
  }

  // Iterate through price sets and filter fields
  if (!empty($amount)) {
    foreach ($amount as $fieldId => $priceFields) {
      $conditionType = _priceconditionfields_get_price_field_type($fieldId);
      //echo '<pre>$conditionType- ';print_r($conditionType);echo '</pre>';
      // echo '<pre>$participantType -';print_r($participantType);echo '</pre>';
      // Check if this field should be visible for current participant type
      if (!_priceconditionfields_should_show_field($conditionType, $participantType)) {
        unset($amount[$fieldId]);
      }
    }
  }
}

/**
 * Get participant type condition for a price field
 */
function _priceconditionfields_get_price_field_type($priceFieldId) {
  $domainID = CRM_Core_Config::domainID();
  $settings = Civi::settings($domainID);
  $participantType = $settings->get('participant_type_condition_fid_' . $priceFieldId);
  if ($participantType) {
    if ($participantType === 'all_participants') {
      return NULL;
    }
    return $participantType;
  }

  return NULL;
}

/**
 * Determine if a price field should be shown based on participant type condition and current participant type
 */
function _priceconditionfields_should_show_field($conditionType, $currentParticipantType) {
  // If no condition, show for all
  if ($conditionType === 'all_participants' || empty($conditionType)) {
    return TRUE;
  }

  // Match condition with current participant type
  switch ($conditionType) {
    case 'primary_participant':
      return $currentParticipantType === 'primary';

    case 'additional_participant':
      return $currentParticipantType === 'additional';

    default:
      return TRUE;
  }
}

/**
 * Detect current participant type during event registration
 *
 * @return string|null - 'primary', 'additional', or NULL
 */
function _priceconditionfields_get_current_participant_type(&$form) {
  // Check form context to determine participant type
  $formName = get_class($form);
  if ($formName == 'CRM_Event_Form_Registration_Register') {
    return 'primary';
  }
  elseif ($formName == 'CRM_Event_Form_Registration_AdditionalParticipant') {
    return 'additional';
  }
  return NULL;
}