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/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * 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.vertx.micrometer.impl;

import io.micrometer.core.instrument.Tags;
import io.vertx.core.net.SocketAddress;
import io.vertx.micrometer.Label;

import java.util.Arrays;

/**
 * @author Joel Takvorian
 */
public final class Labels {
  private Labels() {
  }

  static String address(SocketAddress address) {
    return address(address, null);
  }

  static String address(SocketAddress address, String nameOverride) {
    if (address == null) {
      return "?";
    }
    if (nameOverride == null) {
      return address.toString();
    }
    SocketAddress addrOverride = address.port() >= 0 ? SocketAddress.inetSocketAddress(address.port(), nameOverride)
      : SocketAddress.domainSocketAddress(nameOverride);
    return addrOverride.toString();
  }

  static String getSide(boolean local) {
    return local ? "local" : "remote";
  }

  public static Tags toTags(Label[] keys, String[] values) {
    // Here we shall use Tags object instead of List.
    // Otherwise, some extra copies / iterations will be made
    if (keys.length == 0) {
      return Tags.empty();
    }
    // Creating a Tags object is faster and consumes less resources when providing an array
    String[] keyValuePairs = new String[2 * keys.length];
    int count = 0;
    for (int i = 0; i < keys.length; i++) {
      String value = values[i];
      if (value != null) {
        String lowKey = keys[i].toString();
        keyValuePairs[2 * count] = lowKey;
        keyValuePairs[2 * count + 1] = value;
        count++;
      }
    }
    if (count == 0) {
      return Tags.empty();
    }
    if (count == keys.length) {
      return Tags.of(keyValuePairs);
    }
    return Tags.of(Arrays.copyOf(keyValuePairs, 2 * count));
  }
}