// Licensed to Cloudera, Inc. under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  Cloudera, Inc. licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import CombinedSqlAnalyser from './CombinedSqlAnalyser';
import NoopSqlAnalyzer from './NoopSqlAnalyzer';
import { SqlAnalyzer, SqlAnalyzerProvider } from './types';
import { Connector } from '../../config/types';

const sqlAnalyzerInstances: { [connectorId: string]: SqlAnalyzer | undefined } = {};

const createSqlAnalyzer = (connector: Connector): SqlAnalyzer => {
  if (connector.optimizer === 'api') {
    return new CombinedSqlAnalyser(connector);
  }
  return new NoopSqlAnalyzer();
};

const sqlAnalyzerRepository: SqlAnalyzerProvider = {
  getSqlAnalyzer: (connector: Connector): SqlAnalyzer => {
    let sqlAnalyzer = sqlAnalyzerInstances[connector.id];
    if (!sqlAnalyzer) {
      sqlAnalyzer = createSqlAnalyzer(connector);
      sqlAnalyzerInstances[connector.id] = sqlAnalyzer;
    }
    return sqlAnalyzer;
  }
};

export default sqlAnalyzerRepository;