// 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.sessionqueue.httpd;

import static java.net.HttpURLConnection.HTTP_NO_CONTENT;
import static org.openqa.selenium.grid.config.StandardGridRoles.HTTPD_ROLE;
import static org.openqa.selenium.grid.config.StandardGridRoles.SESSION_QUEUE_ROLE;
import static org.openqa.selenium.json.Json.JSON_UTF_8;
import static org.openqa.selenium.remote.http.Contents.asJson;
import static org.openqa.selenium.remote.http.Route.get;

import com.google.auto.service.AutoService;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import java.io.Closeable;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.Collections;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.openqa.selenium.BuildInfo;
import org.openqa.selenium.cli.CliCommand;
import org.openqa.selenium.grid.TemplateGridServerCommand;
import org.openqa.selenium.grid.config.Config;
import org.openqa.selenium.grid.config.Role;
import org.openqa.selenium.grid.server.Server;
import org.openqa.selenium.grid.sessionqueue.NewSessionQueue;
import org.openqa.selenium.grid.sessionqueue.config.NewSessionQueueOptions;
import org.openqa.selenium.internal.Require;
import org.openqa.selenium.remote.http.HttpResponse;
import org.openqa.selenium.remote.http.Route;

@AutoService(CliCommand.class)
public class NewSessionQueueServer extends TemplateGridServerCommand {

  private static final Logger LOG = Logger.getLogger(NewSessionQueueServer.class.getName());
  private static final String LOCAL_NEW_SESSION_QUEUE =
      "org.openqa.selenium.grid.sessionqueue.local.LocalNewSessionQueue";

  @Override
  public String getName() {
    return "sessionqueue";
  }

  @Override
  public String getDescription() {
    return "Adds this server as the new session queue in a selenium grid.";
  }

  @Override
  public Set<Role> getConfigurableRoles() {
    return ImmutableSet.of(HTTPD_ROLE, SESSION_QUEUE_ROLE);
  }

  @Override
  public Set<Object> getFlagObjects() {
    return Collections.emptySet();
  }

  @Override
  protected String getSystemPropertiesConfigPrefix() {
    return "sessionqueue";
  }

  @Override
  protected Config getDefaultConfig() {
    return new DefaultNewSessionQueueConfig();
  }

  @Override
  protected Handlers createHandlers(Config config) {
    NewSessionQueueOptions queueOptions = new NewSessionQueueOptions(config);

    NewSessionQueue sessionQueue = queueOptions.getSessionQueue(LOCAL_NEW_SESSION_QUEUE);

    return new Handlers(
        Route.combine(
            sessionQueue,
            get("/status")
                .to(
                    () ->
                        req ->
                            new HttpResponse()
                                .addHeader("Content-Type", JSON_UTF_8)
                                .setContent(
                                    asJson(
                                        ImmutableMap.of(
                                            "value",
                                            ImmutableMap.of(
                                                "ready",
                                                true,
                                                "message",
                                                "New Session Queue is ready."))))),
            get("/readyz").to(() -> req -> new HttpResponse().setStatus(HTTP_NO_CONTENT))),
        null) {
      @Override
      public void close() {
        if (sessionQueue instanceof Closeable) {
          try {
            ((Closeable) sessionQueue).close();
          } catch (IOException e) {
            throw new UncheckedIOException(e);
          }
        }
      }
    };
  }

  @Override
  protected void execute(Config config) {
    Require.nonNull("Config", config);

    config
        .get("server", "max-threads")
        .ifPresent(
            value ->
                LOG.log(
                    Level.WARNING,
                    () ->
                        "Support for max-threads flag is deprecated. The intent of the flag is to"
                            + " set the thread pool size in the Distributor. Please use"
                            + " newsession-threadpool-size flag instead."));

    Server<?> server = asServer(config);
    server.start();

    BuildInfo info = new BuildInfo();
    LOG.info(
        String.format(
            "Started Selenium SessionQueue %s (revision %s): %s",
            info.getReleaseLabel(), info.getBuildRevision(), server.getUrl()));
  }
}
