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/*
 * (c) Copyright 2016 Palantir Technologies Inc. All rights reserved.
 *
 * 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 com.palantir.docker.compose.configuration;

import static com.google.common.base.Strings.emptyToNull;
import static com.palantir.docker.compose.configuration.EnvironmentVariables.TCP_PROTOCOL;

import java.util.Optional;
import org.apache.commons.lang3.StringUtils;

public class RemoteHostIpResolver implements HostIpResolver {

    @Override
    public String resolveIp(String dockerHost) {
        return Optional.ofNullable(emptyToNull(dockerHost))
                       .map(host -> StringUtils.substringAfter(host, TCP_PROTOCOL))
                       .map(ipAndMaybePort -> StringUtils.substringBefore(ipAndMaybePort, ":"))
                       .orElseThrow(() -> new IllegalArgumentException("DOCKER_HOST cannot be blank/null"));
    }
}