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// 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.sessionmap.config;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.Optional;
import org.openqa.selenium.grid.config.Config;
import org.openqa.selenium.grid.config.ConfigException;
import org.openqa.selenium.grid.sessionmap.SessionMap;

public class SessionMapOptions {

  private static final String SESSIONS_SECTION = "sessions";

  private static final String DEFAULT_SESSION_MAP =
      "org.openqa.selenium.grid.sessionmap.remote.RemoteSessionMap";
  private static final String DEFAULT_SESSION_MAP_SCHEME = "http";
  private final Config config;

  public SessionMapOptions(Config config) {
    this.config = config;
  }

  public URI getSessionMapUri() {

    String scheme = config.get(SESSIONS_SECTION, "scheme").orElse(DEFAULT_SESSION_MAP_SCHEME);

    Optional<URI> host =
        config
            .get(SESSIONS_SECTION, "host")
            .map(
                str -> {
                  try {
                    URI sessionUri = new URI(str);
                    if (sessionUri.getHost() == null || sessionUri.getPort() == -1) {
                      throw new ConfigException(
                          "Undefined host or port in SessionMap server URI: " + str);
                    }
                    return sessionUri;
                  } catch (URISyntaxException e) {
                    throw new ConfigException("Session Map server URI is not a valid URI: " + str);
                  }
                });

    if (host.isPresent()) {
      return host.get();
    }

    Optional<Integer> port = config.getInt(SESSIONS_SECTION, "port");
    Optional<String> hostname = config.get(SESSIONS_SECTION, "hostname");

    if (!(port.isPresent() && hostname.isPresent())) {
      throw new ConfigException("Unable to determine host and port for the session map server");
    }

    try {
      return new URI(scheme, null, hostname.get(), port.get(), "", null, null);
    } catch (URISyntaxException e) {
      throw new ConfigException(
          "Session map server uri configured through host (%s) and port (%d) is not a valid URI",
          hostname.get(), port.get());
    }
  }

  public SessionMap getSessionMap() {
    return config.getClass(
        SESSIONS_SECTION, "implementation", SessionMap.class, DEFAULT_SESSION_MAP);
  }
}
