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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.graphql;

import com.google.common.collect.ImmutableList;
import java.net.URI;
import java.time.Duration;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.openqa.selenium.Capabilities;
import org.openqa.selenium.grid.data.Availability;
import org.openqa.selenium.grid.data.NodeId;
import org.openqa.selenium.grid.data.Session;
import org.openqa.selenium.grid.data.Slot;
import org.openqa.selenium.internal.Require;
import org.openqa.selenium.json.Json;

public class Node {

  private static final Json JSON = new Json();
  private final NodeId id;
  private final URI uri;
  private final Availability status;
  private final int maxSession;
  private final Duration sessionTimeout;
  private final Map stereotypes;
  private final Map activeSessions;
  private final String version;
  private final OsInfo osInfo;
  private final int slotCount;

  public Node(
      NodeId id,
      URI uri,
      Availability status,
      int maxSession,
      Duration sessionTimeout,
      int slotCount,
      Map stereotypes,
      Map activeSessions,
      String version,
      OsInfo osInfo) {
    this.id = Require.nonNull("Node id", id);
    this.uri = Require.nonNull("Node uri", uri);
    this.status = status;
    this.maxSession = maxSession;
    this.slotCount = slotCount;
    this.stereotypes = Require.nonNull("Node stereotypes", stereotypes);
    this.activeSessions = Require.nonNull("Active sessions", activeSessions);
    this.version = Require.nonNull("Grid Node version", version);
    this.osInfo = Require.nonNull("Grid Node OS info", osInfo);
    this.sessionTimeout = Require.positive("Node session timeout", sessionTimeout);
  }

  public List getSessions() {
    return activeSessions.entrySet().stream()
        .map(this::createGraphqlSession)
        .collect(ImmutableList.toImmutableList());
  }

  public int getSlotCount() {
    return slotCount;
  }

  public int getSessionCount() {
    return activeSessions.size();
  }

  public NodeId getId() {
    return id;
  }

  public URI getUri() {
    return uri;
  }

  public int getMaxSession() {
    return maxSession;
  }

  public List getActiveSessionIds() {
    return activeSessions.keySet().stream()
        .map(session -> session.getId().toString())
        .collect(ImmutableList.toImmutableList());
  }

  public String getStereotypes() {
    List> toReturn = new ArrayList<>();

    for (Map.Entry entry : stereotypes.entrySet()) {
      Map details = new HashMap<>();
      details.put("stereotype", entry.getKey());
      details.put("slots", entry.getValue());
      toReturn.add(details);
    }

    return JSON.toJson(toReturn);
  }

  public Availability getStatus() {
    return status;
  }

  public String getVersion() {
    return version;
  }

  public OsInfo getOsInfo() {
    return osInfo;
  }

  public Duration getSessionTimeout() {
    return sessionTimeout;
  }

  private org.openqa.selenium.grid.graphql.Session createGraphqlSession(
      Map.Entry entry) {
    Session session = entry.getKey();
    Slot slot = entry.getValue();

    return new org.openqa.selenium.grid.graphql.Session(
        session.getId().toString(),
        session.getCapabilities(),
        session.getStartTime(),
        session.getUri(),
        id.toString(),
        uri,
        slot);
  }
}