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/**
 * Copyright 2017 The jetcd authors
 *
 * 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
 *
 *     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 io.etcd.jetcd.resolver;

import com.google.common.base.Preconditions;
import io.grpc.Attributes;
import io.grpc.NameResolver;

import java.net.URI;
import java.util.Collection;
import javax.annotation.Nullable;

public class SmartNameResolverFactory extends NameResolver.Factory {
  private final String authority;
  private final Collection uris;
  private final URIResolverLoader loader;

  private SmartNameResolverFactory(
      String authority, Collection uris, URIResolverLoader loader) {

    Preconditions.checkNotNull(loader, "URIResolverLoader should not be null");
    Preconditions.checkNotNull(authority, "Authority should not be null");

    this.authority = authority;
    this.uris = uris;
    this.loader = loader;
  }

  @Nullable
  @Override
  public NameResolver newNameResolver(URI targetUri, Attributes params) {
    if ("etcd".equals(targetUri.getScheme())) {
      return new SmartNameResolver(this.authority , this.uris, this.loader);
    } else {
      return null;
    }
  }

  @Override
  public String getDefaultScheme() {
    return "etcd";
  }

  public static NameResolver.Factory forEndpoints(
      String authority, Collection endpoints, URIResolverLoader loader) {

    return new SmartNameResolverFactory(authority, endpoints, loader);
  }
}