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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC 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.

package org.openqa.selenium.grid.distributor;

import static org.openqa.selenium.remote.http.Contents.asJson;

import com.google.common.collect.ImmutableMap;
import java.io.UncheckedIOException;
import java.util.Objects;
import org.openqa.selenium.grid.data.NodeId;
import org.openqa.selenium.remote.http.HttpHandler;
import org.openqa.selenium.remote.http.HttpRequest;
import org.openqa.selenium.remote.http.HttpResponse;

public class DrainNode implements HttpHandler {

  private final Distributor distributor;
  private final NodeId nodeId;

  public DrainNode(Distributor distributor, NodeId nodeId) {
    this.distributor = Objects.requireNonNull(distributor);
    this.nodeId = Objects.requireNonNull(nodeId);
  }

  @Override
  public HttpResponse execute(HttpRequest req) throws UncheckedIOException {
    HttpResponse response = new HttpResponse();
    boolean value = distributor.drain(nodeId);

    if (value) {
      response.setContent(
          asJson(
              ImmutableMap.of(
                  "value", value, "message", "Node status was successfully set to draining.")));
    } else {
      response.setContent(
          asJson(
              ImmutableMap.of(
                  "value",
                  value,
                  "message",
                  "Unable to drain node. Please check the node exists by using /status. If so, try"
                      + " again.")));
    }

    return response;
  }
}