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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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package jdk.incubator.http.internal.websocket;

import jdk.incubator.http.HttpClient;

import jdk.incubator.http.WebSocket;

import jdk.incubator.http.WebSocket.Builder;

import jdk.incubator.http.WebSocket.Listener;

import jdk.incubator.http.internal.common.Pair;

import java.net.URI;

import java.time.Duration;

import java.util.Collection;

import java.util.LinkedList;

import java.util.List;

import java.util.concurrent.CompletableFuture;

import static java.lang.String.format;

import static java.util.Objects.requireNonNull;

import static jdk.incubator.http.internal.common.Pair.pair;

public final class BuilderImpl implements Builder {

    private final HttpClient client;

    private final URI uri;

    private final Listener listener;

    private final Collection<Pair<String, String>> headers = new LinkedList<>();

    private final Collection<String> subprotocols = new LinkedList<>();

    private Duration timeout;

        this.client = requireNonNull(client, "client");

        this.uri = checkURI(requireNonNull(uri, "uri"));

        this.listener = requireNonNull(listener, "listener");

    }

    private static IllegalArgumentException newIAE(String message, Object... args) {

        return new IllegalArgumentException(format(message, args));

    }

    private static URI checkURI(URI uri) {

        String scheme = uri.getScheme();

        if (scheme == null)

            throw newIAE("URI with undefined scheme");

        scheme = scheme.toLowerCase();

        if (!(scheme.equals("ws") || scheme.equals("wss")))

            throw newIAE("invalid URI scheme %s", scheme);

        if (uri.getHost() == null)

            throw newIAE("URI must contain a host: %s", uri);

        if (uri.getFragment() != null)

            throw newIAE("URI must not contain a fragment: %s", uri);

        return uri;

    }

    @Override

    public Builder header(String name, String value) {

        requireNonNull(name, "name");

        requireNonNull(value, "value");

        headers.add(pair(name, value));

        return this;

    }

    @Override

    public Builder subprotocols(String mostPreferred,

                                String... lesserPreferred)

    {

        requireNonNull(mostPreferred, "mostPreferred");

        requireNonNull(lesserPreferred, "lesserPreferred");

        List<String> subprotocols = new LinkedList<>();

        subprotocols.add(mostPreferred);

        for (int i = 0; i < lesserPreferred.length; i++) {

            String p = lesserPreferred[i];

            requireNonNull(p, "lesserPreferred[" + i + "]");

            subprotocols.add(p);

        }

        this.subprotocols.clear();

        this.subprotocols.addAll(subprotocols);

        return this;

    }

    @Override

    public Builder connectTimeout(Duration timeout) {

        this.timeout = requireNonNull(timeout, "timeout");

        return this;

    }

    @Override

    public CompletableFuture<WebSocket> buildAsync() {

        return WebSocketImpl.newInstanceAsync(this);

    }

    HttpClient getClient() { return client; }

    URI getUri() { return uri; }

    Listener getListener() { return listener; }

    Collection<Pair<String, String>> getHeaders() { return headers; }

    Collection<String> getSubprotocols() { return subprotocols; }

    Duration getConnectTimeout() { return timeout; }

}