import { PriceTicker } from '../common/priceTicker'
import { StrategyBase } from './strategyBase'
/**
 * Pricecaster Service.
 *
 * Fetcher backend component.
 *
 * Copyright 2022 Wormhole Project Contributors
 *
 * Licensed 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.
 */

/**
 * This strategy just caches the last provided price,
 * acting as a single-item buffer.
 */
export class StrategyLastPrice extends StrategyBase {
  getPrice (): PriceTicker | undefined {
    const ret = this.buffer[this.buffer.length - 1]
    this.clearBuffer()
    return ret
  }
}