<?php

Lib::loadClass('Api_WfsNs');
Lib::loadClass('Api_WfsException');
Lib::loadClass('User');
Lib::loadClass('Core_AclHelper');
Lib::loadClass('Core_AclBase');

// TODO: need PermProfile - array of perm profile list or just 'R,W,X,C,S', etc.

class Core_AclSimpleSchemaBase extends Core_AclBase {

  /** simpleSchema - php structure:

    $simpleSchema = [
      'root' => [
        '@namespace' => 'default_db/ZALICZKA/Zaliczka',
        '@primaryKey' => 'ID',

        'ID' => 'xsd:integer', // short syntax - define only simpleType

        'KWOTA' => [ // long syntax - define type with another params like restrictions
          '@type' => 'xsd:decimal'
        ],

        'worker' => 'ref:Worker' // short syntax - define only type = ref

        'pozycja' => [ // long syntax - define ref with maxOccurs, TODO: use more xsd attributes
          '@ref' => 'ZaliczkaPozycja',
          '@maxOccurs' => 'unbounded'
        ]
      ],
      'Worker' => [
        '@namespace' => 'default_objects/AccessOwner',
        ...
      ],
      'ZaliczkaPozycja' => [
        '@namespace' => 'default_db/ZALICZKA_POZYCJA/ZaliczkaPozycja',
        ...
      ]

      'YT_LINK' => [ '@type' => 'p5:typeSpecialSimpleLink',
        '@label' => "Youtube link",
        '@@params' => [// $acl->getXsdFieldParam($col, 'format');
          'format' => '<a href="https://www.youtube.com/watch?v={LINK}" target="_blank"></a>',
          'aliasMap' => [
            'LINK' => 'LINK'
          ]
        ]
      ],
    ]
   */
  public $_simpleSchema = array();
  public $_xsdTypes = null;// set by parseXsdTypes()
  public $_name = '';
  public $_namespace = '';
  public $_primaryKey = '';
  public $_rootTableName = '';
  public $_sourceNamespace = '';
  public $_xmlnsMap = [];

  public function __construct($simpleSchema = null) {
    if ($simpleSchema) $this->_simpleSchema = $simpleSchema;

    if (!$this->_simpleSchema) throw new Exception("Missing simpleSchema");
    if (empty($this->_simpleSchema['root'])) throw new Exception("Wrong simpleSchema syntax");
    if (empty($this->_simpleSchema['root']['@namespace'])) throw new Exception("Missing @namespace in simpleSchema");
    $this->_namespace = $this->_simpleSchema['root']['@namespace'];
    $ns = explode('/', $this->_namespace);
    $this->_name = end($ns);
    if (empty($this->_rootTableName)) {
      if (count($ns) < 3) throw new Exception("Wrong @namespace syntax in simpleSchema ns({$this->_simpleSchema['root']['@namespace']})");
      $this->_rootTableName = $ns[1];
    }
    {
      $this->_sourceNamespace = explode('/', $this->_namespace);
      array_pop($this->_sourceNamespace);// remove name
      $this->_sourceNamespace = implode('__x3A__', $this->_sourceNamespace);
    }

    if (empty($this->_simpleSchema['root']['@primaryKey'])) $this->_simpleSchema['root']['@primaryKey'] = 'ID';// TODO: throw new Exception("Missing @primaryKey in simpleSchema '{$this->_name}'");
    $this->_primaryKey = $this->_simpleSchema['root']['@primaryKey'];// TODO: check if field exists

    {// validate and fix _simpleSchema:
      // - convert field scalar to [ '@type' => ... ]
      // - check required @namespace attribute
      foreach ($this->_simpleSchema as $keySchema => $schema) {
        foreach ($schema as $fieldName => $params) {
          if ('@' == substr($fieldName, 0, 1)) continue;// skip params
          if (is_scalar($params)) {
            $this->_simpleSchema[ $keySchema ][ $fieldName ] = [ '@type' => $params ];
          } else if (!is_array($params)) {
            throw new Exception("Parse error - simpleSchema field type");
          }
        }
        if (empty($schema['@namespace'])) throw new Exception("Missing @namespace in schema for '{$keySchema}'");
        $ns = explode('/', $schema['@namespace']);
        $name = end($ns);
        if (count($ns) < 2) throw new Exception("Wrong @namespace syntax in schema for '{$keySchema}'");
      }
    }

    // $this->parseXsdTypes();// parse xsdTypes
    $this->_xsdTypes = array();
    {
      $generatedIdZasob = 10000;// fake zasob id
      foreach ($this->_simpleSchema['root'] as $key => $value) {
        if ('@' == substr($key, 0, 1)) continue;// skip attributes
        if (is_array($value)) {
          $fieldName = $key;
          $field = [ 'name' => $fieldName, 'perms' => '', 'idZasob' => $generatedIdZasob ];
          if (!empty($value['@label'])) $field['label'] = $value['@label'];

          if (!empty($value['@type'])) $field['xsdType'] = "{$value['@type']}";
          else if (!empty($value['@ref'])) {
            $field['xsdType'] = (false !== strpos($value['@ref'], '/'))
              ? "ref_uri:{$value['@ref']}"
              : "ref:{$value['@ref']}";
          }
          else throw new Exception("StorageAcl - field type not defined '{$key}'");

          if (!empty($value['@maxOccurs'])) $field['maxOccurs'] = $value['@maxOccurs'];
          $this->_xsdTypes[$fieldName] = $field;
        } else if (is_scalar($value)) {// short syntax: $fieldName => $xsdType
          $fieldName = $key;
          $field = [ 'name' => $fieldName, 'perms' => '', 'idZasob' => $generatedIdZasob ];
          $field['xsdType'] = $value;
          $this->_xsdTypes[$fieldName] = $field;
        } else {
          throw new Exception("StorageAcl - TODO: Unimplemented value type in simpleSchema: " . json_encode($value));
        }
        $generatedIdZasob++;
      }
    }

    // TODO: fix 'ref:*' types - use Core_AclHelper::parseNamespaceUrl($namespace)

  }

  public function __toString() {
    $out = "xsd @prefix(default_db__x3A__{$this->_rootTableName})" . "\n";
    $aliasRefUri = array();
    foreach ($this->_simpleSchema as $objectName => $schema) {
      if ('root' == $objectName) $objectName = $this->_name;
      $out .= "\t" . "{$objectName}";
        $out .= " @namespace({$schema['@namespace']})";
      $out .= "\n";
      foreach ($schema as $fieldName => $field) {
        if ('@' == substr($fieldName, 0, 1)) continue;// skip tags
        $out .= "\t\t" . "{$fieldName}";
        if (!empty($field['@type'])) {
          $out .= " @type({$field['@type']})";
          if (!empty($field['@alias'])) $out .= " @alias({$field['@alias']})";
        } else if (!empty($field['@ref'])) {
          $out .= " @ref({$field['@ref']})";
          if (false !== strpos($field['@ref'], '/')) $aliasRefUri[ $fieldName ] = $field['@ref'];
        } else {
          $out .= " @BUG('missing @type or @ref')";
        }
        // TODO: maxOccurs, nillable, etc.
        $out .= "\n";
      }
      foreach ($aliasRefUri as $fieldName => $nsUri) {
        $out .= "\t" . "{$objectName} @ref({$nsUri})" . "\n";
        // TODO: maxOccurs, nillable, etc.
      }
    }
    return $out;
  }

  public function hasSimpleSchema() { return true; }
  public function getSimpleSchema() { return $this->_simpleSchema; }
  public function getSimpleSchemaTree() {
    $tree = array();
    $tree['@namespace'] = $this->getNamespace();
    foreach ($this->getXsdTypes() as $fieldName => $field) {
      $tree[$fieldName] = $field;
      if (is_array($field) && 'ref_uri:' == substr($field['xsdType'], 0, 8)) {
        $tree[$fieldName] = $this->_getSimpleSchemaTreeRec(substr($field['xsdType'], 8), $this->getNamespace());
      }
    }
    return $tree;
  }
  public function _getSimpleSchemaTreeRec($ref, $namespacePath = '', $loopCount = 0) {
    if (++$loopCount > 100) die("Recurse limit in getSimpleSchemaTree for schema({$this->_namespace})");
    // echo "<p>DBG: F._getSimpleSchemaTreeRec({$ref}) \$namespacePath[$namespacePath]</p>";
    $tree = array();
    if (!empty($this->_simpleSchema[$ref])) {
      $tree = array();
      foreach ($this->_simpleSchema[$ref] as $fieldName => $field) {
        // echo "<p>DBG: F._getSimpleSchemaTreeRec({$ref}) \$namespacePath[$namespacePath] - 1/'{$fieldName}'</p>";
        $tree[$fieldName] = $field;
        if (is_array($field) && 'ref_uri:' == substr($field['xsdType'], 0, 8)) {
          $nsField = substr($field['xsdType'], 8);
          if (in_array($nsField, explode(',', $namespacePath))) {
            $tree[$fieldName]['@recurse_namespace'] = true;
            continue;
          }
          $tree[$fieldName] = $this->_getSimpleSchemaTreeRec($nsField, "{$namespacePath},{$nsField}", $loopCount);
        }
      }
    } else {
      $acl = Core_AclHelper::getAclByNamespace($ref);
      $tree['@namespace'] = $acl->getNamespace();
      foreach ($acl->getXsdTypes() as $fieldName => $field) {
        // echo "<p>DBG: F._getSimpleSchemaTreeRec({$ref}) \$namespacePath[$namespacePath] - 2/'{$fieldName}'</p>";
        $tree[$fieldName] = $field;
        if (is_array($field) && 'ref_uri:' == substr($field['xsdType'], 0, 8)) {
          $nsField = substr($field['xsdType'], 8);
          if (in_array($nsField, explode(',', $namespacePath))) {
            $tree[$fieldName]['@recurse_namespace'] = true;
            continue;
          }
          $tree[$fieldName] = $this->_getSimpleSchemaTreeRec($nsField, "{$namespacePath},{$nsField}", $loopCount);
        }
      }
    }
    // echo'<pre>F._getSimpleSchemaTreeRec('.$ref.') tree';print_r($tree);echo'</pre>';
    return $tree;
  }
  public function getName() { return $this->_name; }
  public function getRootTableName() { return $this->_rootTableName; }
  public function getXsdTypes() { return $this->_xsdTypes; }

  public function getNamespace() { return $this->_namespace; }
  public function getSourceName() { return $this->_sourceNamespace; }
  public function init($force = false) {}
  public function isInitialized() { return true; }
  public function getFieldListByIdZasob() { return $this->getRealFieldListByIdZasob(); }
  public function getVisibleFieldListByIdZasob() { return $this->getRealFieldListByIdZasob(); }
  public function getVirtualFieldListByIdZasob() { return array(); }
  public function getRealFieldListByIdZasob($force = false) {
    $cols = array();
    foreach ($this->getFields() as $idField => $field) {
      $cols[$idField] = $field['name'];
    }
    return $cols;
  }
  public function getFields() {// @returns array - $this->_fields
    $fieldsById = array();
    foreach ($this->getXsdTypes() as $fieldName => $field) {
      $field['name'] = $fieldName;
      $field['label'] = V::get('label', $fieldName, $field);
      if ('p5:www_link' == $field['xsdType']) $field['simpleType'] = 'p5:www_link';
      $fieldsById[ $field['idZasob'] ] = $field;
    }
    return $fieldsById;
  }
  public function getFieldType($fieldName) {
    foreach ($this->getFields() as $field) {
      if ($fieldName == $field['name']) return $field;
    }
    return null;
  }

  // TODO: replace legacy functions: isAllowed, hasFieldPerm, getFieldIdByName
  public function canCreateField($fieldName) { return false; }// TODO: perms from Procesy
  public function canReadField($fieldName) { return true; }// TODO: perms from Procesy
  public function canReadObjectField($fieldName, $record) { return true; }// TODO: perms from Procesy
  public function canWriteField($fieldName) { return false; }// TODO: perms from Procesy
  public function canWriteObjectField($fieldName, $record) { return false; }// TODO: perms from Procesy

  public function getTotal($params = array()) { throw new Exception("Unimplemented - TODO: " . get_class($this) . "::" . __FUNCTION__); }// TODO: use ParseOgcQuery
  public function getItem($primaryKey, $params = []) { throw new Exception("Unimplemented - TODO: " . get_class($this) . "::" . __FUNCTION__); }
  public function getItems($params = array()) { throw new Exception("Unimplemented - TODO: " . get_class($this) . "::" . __FUNCTION__); }// TODO: use ParseOgcQuery
  public function itemsFetchRefs(&$items) { throw new Exception("Unimplemented - TODO: " . get_class($this) . "::" . __FUNCTION__); }// TODO: , $fieldName = ''
  public function fetchItemFieldRefs($primaryKey, $fieldName) {
    $refTable = ACL::getRefTable($this->getNamespace(), $fieldName);
    $sqlPk = DB::getPDO()->quote($primaryKey, PDO::PARAM_STR);
    return array_map(
      function ($row) {
        return [
          'xlink' => "{$row['REMOTE_TYPENAME']}.{$row['REMOTE_PRIMARY_KEY']}" // TODO:
        ];
      }
      , DB::getPDO()->fetchAll("
          select r.REMOTE_PRIMARY_KEY, r.REMOTE_TYPENAME
            from `{$refTable}` r
          where r.PRIMARY_KEY = {$sqlPk}
            and r.A_STATUS != 'DELETED'
        ")
    );
  }
  public function addItem($itemTodo) { throw new Exception("Unimplemented - TODO: " . get_class($this) . "::" . __FUNCTION__); }
  public function updateItem($itemPatch) { throw new Exception("Unimplemented - TODO: " . get_class($this) . "::" . __FUNCTION__); }

  public function getGeomFieldType($fieldName) { return null; }
  public function getPrimaryKeyField() { return $this->_primaryKey; }
  public function getSqlPrimaryKeyField() {
    return (!empty($this->_simpleSchema['root'][$this->_primaryKey]['@alias']))
      ? $this->_simpleSchema['root'][$this->_primaryKey]['@alias']
      : $this->_primaryKey;
  }
  public function getSqlFieldName($fieldName) {
    if (empty($this->_simpleSchema['root'][$fieldName])) throw new Exception("Missing field in schema '{$fieldName}'");
    return (!empty($this->_simpleSchema['root'][$fieldName]['@alias']))
      ? $this->_simpleSchema['root'][$fieldName]['@alias']
      : $fieldName;
  }
  public function getID() { return 0; }
  public function getAttributesFromZasoby() { return array(); }
  public function isEnumerationField($fieldName) { return false; }
  public function getEnumerations($fieldName) { return null; }
  public function getXsdFieldType($fieldName) {
    $xsdTypes = $this->getXsdTypes();
    if (empty($xsdTypes[$fieldName])) throw new Exception("Field '{$fieldName}' not exists");
    return $xsdTypes[$fieldName]['xsdType'];
  }
  public function isGeomField($fieldName) {
    if ('File' == $fieldName) return false;
    if ('AccessGroupRead' == $fieldName) return false;
    if ('AccessGroupWrite' == $fieldName) return false;
    if ('AccessOwner' == $fieldName) return false;
    // if ('NestedObjectTest' == $fieldName) return false;
    // return $this->parentAcl->isGeomField($fieldName);
  }

  public function generateSqlSelectFromRootTable($prefix = 't') {
    $sqlSelect = [];
    foreach ($this->_simpleSchema['root'] as $key => $field) {
      if ('@' == substr($key, 0, 1)) continue;// skip attr
      if (!empty($field['@ref'])) continue;// skip ref
      if (empty($field['@type'])) continue;// skip wrong simpleType structure - BUG
      if ('xsd:' != substr($field['@type'], 0, 4)) continue;// skip non xsd types - eg. p5:typeSpecialSimpleLink
      $sqlField = (!empty($field['@alias'])) ? $field['@alias'] : $key;
      $sqlSelect[] = "{$prefix}.`{$sqlField}` as `$key`";
    }
    return implode("\n, ", $sqlSelect);
  }

  public function getXsdFieldParam($fieldName, $paramKey) {
    if (empty($this->_simpleSchema['root'][$fieldName])) return null;
    if (empty($this->_simpleSchema['root'][$fieldName]['@@params'])) return null;
    if (empty($this->_simpleSchema['root'][$fieldName]['@@params'][$paramKey])) return null;
    return $this->_simpleSchema['root'][$fieldName]['@@params'][$paramKey];
	}

  public function addP5Types(&$item) {
    DBG::_('DBG_ACL', '>1', "\$item", $item, __CLASS__, __FUNCTION__, __LINE__);
    $sqlSelect = [];
    foreach ($this->_simpleSchema['root'] as $key => $field) {
      if ('@' == substr($key, 0, 1)) continue;// skip attr
      if (empty($field['@type'])) continue;// skip ref
      if ('p5:' != substr($field['@type'], 0, 3)) continue;// skip non p5 types
      $fieldName = $key;
      $item[$fieldName] = '';
      switch ($field['@type']) {
        case 'p5:typeSpecialSimpleLink': {
          // '@@params' => [// $acl->getXsdFieldParam($col, 'format');
          //   'format' => '<a href="https://www.youtube.com/watch?v={LINK}" target="_blank"></a>',
          //   'aliasMap' => [
          //     'LINK' => 'LINK'
          //   ]
          // ]
          $link = $this->getXsdFieldParam($fieldName, 'format');
          // $.each(_fieldProps._tsSimpleLink.aliasMap, function(i, v) {
          //   //console.log('simpleLink aliasMap columnName:', columnName, 'i:', i, 'v:', v, 'props['+v+']', props[v], 'val', val, 'typeof val', typeof val);
          //   if (undefined !== row[v]) {
          //     valLink = valLink.replace(new RegExp('\{' + i + '\}', 'g'), row[v]);
          //   }
          // });
          foreach ($this->getXsdFieldParam($fieldName, 'aliasMap') as $itemFieldName => $alias) {
            DBG::_('DBG_ACL', '>1', "aliasMap({$itemFieldName} => {$alias})", $item[$itemFieldName], __CLASS__, __FUNCTION__, __LINE__);
            $link = str_replace("{{$alias}}", $item[$itemFieldName], $link);
          }
          $item[$fieldName] = $link;
        } break;
      }
    }
  }

  public function getParamCols($params = []) {
    $filterCols = [];
    $cols = V::get('cols', [], $params);// wfs:propertyName
    if (empty($cols)) {// set default filter cols
      foreach ($this->_simpleSchema['root'] as $fieldName => $field) {
        if ('@' == substr($fieldName, 0, 1)) continue;
        if ('unbounded' == V::get('maxOccurs', '', $field)) continue;// TODO:?: default load only single value fields (skip maxOccurs="unbounded")?
        if (!empty($field['@type'])) {
          if ('xsd:' === substr($field['@type'], 0, 4)) $filterCols[$fieldName] = true;
          else if ('p5:' === substr($field['@type'], 0, 3)) $filterCols[$fieldName] = true;
        } else if (!empty($field['@ref'])) {
          $filterCols[$fieldName] = [];
        } else throw new Exception("Schema error for field '{$fieldName}' ns({$this->_namespace})");
      }
    } else {
      foreach ($cols as $fieldXPath) {
        if ('@' == substr($fieldXPath, 0, 1)) {// attr
          if ('@instance' === $fieldXPath) {
            $filterCols['@instance'] = true;
          } else {
            throw new Exception("Not implemented attribute name '{$fieldXPath}' in '{$this->_namespace}'");
          }
        } else if (false === strpos($fieldXPath, '/')) {// not xpath - field name
          if (!array_key_exists($fieldXPath, $this->_simpleSchema['root'])) throw new Exception("Field name '{$fieldXPath}' not exists in '{$this->_namespace}'");
          $field = $this->_simpleSchema['root'][$fieldXPath];
          if (!empty($field['@type'])) {
            $filterCols[$fieldXPath] = true;
          } else if (!empty($field['@ref'])) {
            $filterCols[$fieldXPath] = [];
          }
        } else {// is xpath
          list($fieldName, $subXPath) = explode('/', $fieldXPath, 2);// split only by first '/'
          $filterCols[$fieldXPath][$fieldName] = $subXPath;
        }
      }
    }
    return $filterCols;
  }

  public function buildFromSqlRow($row, $params = []) {
    $object = [];
    $filterCols = $this->getParamCols($params);
    // $object['_raw'] = $row;
    if (in_array('@instance', $filterCols)) {
      $instanceTable = Core_AclHelper::getInstanceTable($this->getRootTableName());
      $sqlPkFieldName = $this->getSqlPrimaryKeyField();
      if (empty($row[$sqlPkFieldName])) throw new Exception("Missing primary key in ({$this->_namespace})");
      $sqlPk = DB::getPDO()->quote($row[$sqlPkFieldName], PDO::PARAM_STR);
      $object['@instance'] = DB::getPDO()->fetchValue("
        select i.INSTANCE_NAME
        from `{$instanceTable}` i
        where i.PRIMARY_KEY = {$sqlPk}
      ");// TODO: where i.`INSTANCE_TYPE` = 'instance' -- (i.`INSTANCE_TYPE` != 'derived')
    }

    foreach ($this->_simpleSchema['root'] as $fieldName => $field) {
      if ('@' == substr($fieldName, 0, 1)) continue;
      if (!array_key_exists($fieldName, $filterCols)) continue;// only filter cols
      if (!empty($field['@type'])) {
        // UI::alert('warning', "TODO: field({$fieldName}) type({$field['@type']})");
        if ('xsd:' === substr($field['@type'], 0, 4)) {
          $sqlFieldName = (!empty($field['@alias'])) ? $field['@alias'] : $fieldName;
          $object[$fieldName] = V::get($sqlFieldName, '', $row);
        } else if ('p5:enum' === $field['@type']) {
          $sqlFieldName = (!empty($field['@alias'])) ? $field['@alias'] : $fieldName;
          $object[$fieldName] = V::get($sqlFieldName, '', $row);
        } else if ('p5:' === substr($field['@type'], 0, 3)) {
          $object[$fieldName] = "TODO: generate value for type {$field['@type']} - field '{$fieldName}' ns({$this->_namespace})";// TODO: single field method like addP5Types
        } else throw new Exception("Not Implemented type for field '{$fieldName}' ns({$this->_namespace})");
      } else if (!empty($field['@ref'])) {
        // $object[$fieldName] = $this->fetchItemFieldRefs($primaryKey, $fieldName);
        $refTable = ACL::getRefTable($this->getNamespace(), $fieldName);
        $primaryKey = $row['ID'];// TODO: get primary key
        $sqlPk = DB::getPDO()->quote($primaryKey, PDO::PARAM_STR);
        $remoteIds = array_map(
          function ($row) {
            return $row['REMOTE_PRIMARY_KEY'];
          }
          , DB::getPDO()->fetchAll("
              select r.REMOTE_PRIMARY_KEY, r.REMOTE_TYPENAME
                from `{$refTable}` r
              where r.PRIMARY_KEY = {$sqlPk}
                and r.A_STATUS != 'DELETED'
            ")
        );
        $object[$fieldName] = (!empty($remoteIds))
          ? array_values(ACL::getAclByNamespace($field['@ref'])->getItems(['@primaryKey' => $remoteIds]))
          : [];
      } else throw new Exception("Schema error for field '{$fieldName}' ns({$this->_namespace})");
    }
    return $object;
  }

  public function getChildHistTable($childName) {
    if (empty($childName)) throw new Exception("Missing childName ('{$this->_namespace}')");
    if (!array_key_exists($childName, $this->_simpleSchema['root'])) throw new Exception("Field '{$childName}' not found in shema for '{$this->_namespace}'");
    if ('@' == substr($childName, 0, 1)) throw new Exception("Child hist table for attribute '{$childName}' not supported ('{$this->_namespace}')");
    // TODO: allow child for '@instance'
    $childSchema = $this->_simpleSchema['root'][$childName];
    return Core_AclHelper::getChildHistTable($this->getRootTableName(), $childName, $childSchema);
  }

  public function getEnumValues($childName) {
    $childSchema = $this->_simpleSchema['root'][$childName];
    DBG::log([
      'msg' => 'dbg acl',
      'sql field name' => $this->getSqlFieldName($childName),
      'xsdType' => $this->getXsdFieldType($childName),
      'childSchema' => $childSchema,
    ]);

    if ('p5:enum' == $this->getXsdFieldType($childName)) {
      if (!empty($this->_simpleSchema['root'][$childName]['@aliasFieldValues'])) {
        $aliasConf = $this->_simpleSchema['root'][$childName]['@aliasFieldValues'];
        $acl = Core_AclHelper::getAclByNamespace($aliasConf['namespace']);
        $sqlFldName = DB::getPDO()->quote($acl->getSqlFieldName($aliasConf['childName']), PDO::PARAM_STR);
        $sqlTblName = DB::getPDO()->quote($acl->getRootTableName(), PDO::PARAM_STR);
        $sqlDbName = DB::getPDO()->quote(DB::getPDO()->getDatabaseName(), PDO::PARAM_STR);
      } else {
        $sqlFldName = DB::getPDO()->quote($this->getSqlFieldName($childName), PDO::PARAM_STR);
        $sqlTblName = DB::getPDO()->quote($this->getRootTableName(), PDO::PARAM_STR);
        $sqlDbName = DB::getPDO()->quote(DB::getPDO()->getDatabaseName(), PDO::PARAM_STR);
      }
      $optionsEnum = DB::getPDO()->fetchValue("
        select COLUMN_TYPE
        from information_schema.COLUMNS c
        where c.COLUMN_NAME = {$sqlFldName}
          and c.TABLE_SCHEMA = {$sqlDbName}
          and c.TABLE_NAME = {$sqlTblName}
      ");
      if (!empty($optionsEnum)) {
        $optionsEnum = substr($optionsEnum, strlen('enum'));
        $optionsEnum = trim($optionsEnum, "()'");
        DBG::log(['msg' => '$optionsEnum', '$optionsEnum' => $optionsEnum]);
        return explode("','", $optionsEnum);
      }
      DBG::log(['msg' => 'Error empty options from enum field', '$optionsEnum' => $optionsEnum]);
      return null;
    }
    return null;
  }

}