/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 { FilterType, FilterExpression as FilterExpressionPB } from '../../proto/apache/rocketmq/v2/definition_pb';
import { hashCodeOfString } from '../util';

const TAG_EXPRESSION_SUB_ALL = '*';

export class FilterExpression {
  static readonly SUB_ALL = new FilterExpression(TAG_EXPRESSION_SUB_ALL);

  readonly expression: string;
  readonly filterType: FilterType;

  constructor(expression: string, filterType = FilterType.TAG) {
    this.expression = expression;
    this.filterType = filterType;
  }

  toProtobuf() {
    return new FilterExpressionPB()
      .setType(this.filterType)
      .setExpression(this.expression);
  }

  equals(other: FilterExpression): boolean {
    if (this === other) return true;
    if (!other) return false;
    return this.expression === other.expression &&
      this.filterType === other.filterType;
  }

  hashCode(): number {
    let hash = 17;
    // eslint-disable-next-line no-bitwise
    hash = (hash * 31 + hashCodeOfString(this.expression)) | 0;
    // eslint-disable-next-line no-bitwise
    hash = (hash * 31 + this.filterType) | 0;
    return hash;
  }

  toString() {
    return `FilterExpression(${this.filterType},${this.expression})`;
  }
}
