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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.Strings;
import io.etcd.jetcd.common.exception.ErrorCode;
import io.etcd.jetcd.common.exception.EtcdExceptionFactory;

import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.URI;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;


public final class DirectUriResolver implements URIResolver {

  private static final List SCHEMES = Arrays.asList("http", "https");

  private ConcurrentMap> cache;

  DirectUriResolver() {
    this.cache = new ConcurrentHashMap<>();
  }

  @Override
  public int priority() {
    return Integer.MIN_VALUE;
  }

  @Override
  public boolean supports(URI uri) {
    if (!SCHEMES.contains(uri.getScheme())) {
      return false;
    }

    if (!Strings.isNullOrEmpty(uri.getPath())) {
      return false;
    }

    if (uri.getPort() == -1) {
      return false;
    }

    return true;
  }

  @Override
  public List resolve(URI uri) {
    if (!supports(uri)) {
      // Wrap as etcd exception but set a proper cause
      throw EtcdExceptionFactory.newEtcdException(
          ErrorCode.INVALID_ARGUMENT,
          "Unsupported URI " + uri
      );
    }

    return this.cache.computeIfAbsent(
        uri,
        u -> Collections.singletonList(new InetSocketAddress(uri.getHost(), uri.getPort()))
    );
  }
}