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/*
 * Copyright 2010 Proofpoint, Inc.
 *
 * 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.airlift.http.server;

import com.google.common.base.Throwables;
import com.google.common.net.InetAddresses;
import com.google.inject.Inject;
import io.airlift.node.NodeInfo;

import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.URI;

public class HttpServerInfo
{
    private final URI httpUri;
    private final URI httpExternalUri;
    private final URI httpsUri;
    private final URI httpsExternalUri;
    private final URI adminUri;
    private final URI adminExternalUri;

    @Inject
    public HttpServerInfo(HttpServerConfig config, NodeInfo nodeInfo)
    {
        if (config.isHttpEnabled()) {
            httpUri = buildUri("http", InetAddresses.toUriString(nodeInfo.getInternalIp()), config.getHttpPort());
            httpExternalUri = buildUri("http", nodeInfo.getExternalAddress(), httpUri.getPort());
        }
        else {
            httpUri = null;
            httpExternalUri = null;
        }

        if (config.isHttpsEnabled()) {
            httpsUri = buildUri("https", InetAddresses.toUriString(nodeInfo.getInternalIp()), config.getHttpsPort());
            httpsExternalUri = buildUri("https", nodeInfo.getExternalAddress(), httpsUri.getPort());
        }
        else {
            httpsUri = null;
            httpsExternalUri = null;
        }

        if (config.isAdminEnabled()) {
            if (config.isHttpsEnabled()) {
                adminUri = buildUri("https", InetAddresses.toUriString(nodeInfo.getInternalIp()), config.getAdminPort());
                adminExternalUri = buildUri("https", nodeInfo.getExternalAddress(), adminUri.getPort());
            } else {
                adminUri = buildUri("http", InetAddresses.toUriString(nodeInfo.getInternalIp()), config.getAdminPort());
                adminExternalUri = buildUri("http", nodeInfo.getExternalAddress(), adminUri.getPort());
            }
        }
        else {
            adminUri = null;
            adminExternalUri = null;
        }
    }

    public URI getHttpUri()
    {
        return httpUri;
    }

    public URI getHttpExternalUri()
    {
        return httpExternalUri;
    }

    public URI getHttpsUri()
    {
        return httpsUri;
    }

    public URI getHttpsExternalUri()
    {
        return httpsExternalUri;
    }

    public URI getAdminUri()
    {
        return adminUri;
    }

    public URI getAdminExternalUri()
    {
        return adminExternalUri;
    }

    private static URI buildUri(String scheme, String host, int port)
    {
        try {
            // 0 means select a random port
            if (port == 0) {
                ServerSocket socket = new ServerSocket();
                try {
                    socket.bind(new InetSocketAddress(0));
                    port = socket.getLocalPort();
                }
                finally {
                    socket.close();
                }
            }

            return new URI(scheme, null, host, port, null, null, null);
        }
        catch (Exception e) {
            throw Throwables.propagate(e);
        }
    }
}