com.megaphonetech.entitytemplates/CRM/EntityTemplates/BAO/EntityTemplates.php

<?php

class CRM_EntityTemplates_BAO_EntityTemplates extends CRM_Core_DAO_EntityTemplates {

  /**
   * Build Entity option list.
   *
   */
  public static function getEntityTypes() {
    $result = civicrm_api3('OptionValue', 'get', [
      'return' => ["value"],
      'option_group_id' => "entity_template_for",
      'options' => ['limit' => 0],
    ]);
    return array_column($result['values'], 'value', 'value');
  }

  /**
   * Create Entity Template.
   *
   * @param array $params
   *
   * @throws Exception
   * @return CRM_EntityTemplates_BAO_EntityTemplates|CRM_Core_Error
   */
  public static function create($params) {

    if (empty($params['entity_table'])) {
      throw new CRM_Core_Exception(ts('Entity Table is mandatory.'));
    }
    try {
      $optionValueName = civicrm_api3('OptionValue', 'getvalue', [
        'option_group_id' => "entity_template_for",
        'value' => $params['entity_table'],
        'return' => 'name',
      ]);
    }
    catch (CiviCRM_API3_Exception $e) {
      throw new CRM_Core_Exception(ts('Invalid Entity Type.'));
    }

    if (empty($params['form_values'])) {
      return;
    }
    $params['form_values'] = serialize($params['form_values']);

    if (!empty($params['id'])) {
      CRM_Utils_Hook::pre('edit', 'EntityTemplates', $params['id'], $params);
    }
    else {
      CRM_Utils_Hook::pre('create', 'EntityTemplates', NULL, $params);
    }

    $entityTemplates = new CRM_EntityTemplates_BAO_EntityTemplates();
    $entityTemplates->copyValues($params);
    $entityTemplates->save();

    if (!empty($params['id'])) {
      CRM_Utils_Hook::post('edit', 'EntityTemplates', $entityTemplates->id, $entityTemplates);
    }
    else {
      CRM_Utils_Hook::post('create', 'EntityTemplates', $entityTemplates->id, $entityTemplates);
    }

    return $entityTemplates;
  }

}