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/*
 * Copyright 2021 Google LLC
 *
 * 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
 *
 *     https://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 com.google.apphosting.runtime;

import com.google.apphosting.runtime.anyrpc.APIHostClientInterface;
import com.google.common.base.Preconditions;
import com.google.common.net.HostAndPort;
import java.lang.reflect.Method;
import java.util.OptionalInt;

/**
 * Make an APIHostClientInterface. Uses either an HTTP client or a Unix Domain Socket-based client.
 */
public class ApiHostClientFactory {
  public ApiHostClientFactory() {
  }

  public APIHostClientInterface newAPIHost(String trustedHost, OptionalInt maxConcurrentRpcs) {
    HostAndPort hostAndPort = HostAndPort.fromString(trustedHost);
    Preconditions.checkArgument(
        hostAndPort.hasPort(), "Missing port number: %s", trustedHost);
    Preconditions.checkArgument(
        !hostAndPort.getHost().isEmpty(), "Missing host: %s", trustedHost);
    return httpApiHostClient(hostAndPort, maxConcurrentRpcs);
  }

  private APIHostClientInterface httpApiHostClient(
      HostAndPort hostAndPort, OptionalInt maxConcurrentRpcs) {
    try {
      Class httpApiHostClientClass =
          Class.forName("com.google.apphosting.runtime.http.HttpApiHostClientFactory");
      Method create =
          httpApiHostClientClass.getMethod("create", HostAndPort.class, OptionalInt.class);
      return (APIHostClientInterface) create.invoke(null, hostAndPort, maxConcurrentRpcs);
    } catch (ReflectiveOperationException e) {
      throw new RuntimeException(e);
    }
  }
}