/*

 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package jdk.incubator.http;

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

import jdk.incubator.http.internal.websocket.WebSocketRequest;

import java.io.IOException;

import java.net.InetSocketAddress;

import java.net.ProxySelector;

import java.net.URI;

import java.security.AccessControlContext;

import java.time.Duration;

import java.util.Locale;

import java.util.Optional;

import static jdk.incubator.http.internal.common.Utils.ALLOWED_HEADERS;

class HttpRequestImpl extends HttpRequest implements WebSocketRequest {

    private final HttpHeaders userHeaders;

    private final HttpHeadersImpl systemHeaders;

    private final URI uri;

    private InetSocketAddress authority; // only used when URI not specified

    private final String method;

    final BodyProcessor requestProcessor;

    final boolean secure;

    final boolean expectContinue;

    private boolean isWebSocket;

    private AccessControlContext acc;

    private final Duration duration;

    private final Optional<HttpClient.Version> version;

    /**

     * Creates an HttpRequestImpl from the given builder.

     */

    public HttpRequestImpl(HttpRequestBuilderImpl builder) {

        String method = builder.method();

        this.method = method == null? "GET" : method;

        this.userHeaders = ImmutableHeaders.of(builder.headers().map(), ALLOWED_HEADERS);

        this.systemHeaders = new HttpHeadersImpl();

        this.uri = builder.uri();

        this.expectContinue = builder.expectContinue();

        this.secure = uri.getScheme().toLowerCase(Locale.US).equals("https");

        if (builder.body() == null) {

            this.requestProcessor = HttpRequest.noBody();

        } else {

            this.requestProcessor = builder.body();

        }

        this.duration = builder.duration();

        this.version = builder.version();

    }

    /**

     * Creates an HttpRequestImpl from the given request.

     */

    public HttpRequestImpl(HttpRequest request) {

        String method = request.method();

        this.method = method == null? "GET" : method;

        this.userHeaders = request.headers();

        if (request instanceof HttpRequestImpl) {

            this.systemHeaders = ((HttpRequestImpl) request).systemHeaders;

            this.isWebSocket = ((HttpRequestImpl) request).isWebSocket;

        } else {

            this.systemHeaders = new HttpHeadersImpl();

        }

        this.uri = request.uri();

        this.expectContinue = request.expectContinue();

        this.secure = uri.getScheme().toLowerCase(Locale.US).equals("https");

        if (!request.bodyProcessor().isPresent()) {

            this.requestProcessor = HttpRequest.noBody();

        } else {

            this.requestProcessor = request.bodyProcessor().get();

        }

        this.duration = request.duration();

        this.version = request.version();

    }

    /** Creates a HttpRequestImpl using fields of an existing request impl. */

    public HttpRequestImpl(URI uri,

                           String method,

                           HttpRequestImpl other) {

        this.method = method == null? "GET" : method;

        this.userHeaders = other.userHeaders;

        this.isWebSocket = other.isWebSocket;

        this.systemHeaders = other.systemHeaders;

        this.uri = uri;

        this.expectContinue = other.expectContinue;

        this.secure = uri.getScheme().toLowerCase(Locale.US).equals("https");

        this.requestProcessor = other.requestProcessor;

        this.acc = other.acc;

        this.duration = other.duration;

        this.version = other.version();

    }

    /* used for creating CONNECT requests  */

    HttpRequestImpl(String method, HttpClientImpl client,

                    InetSocketAddress authority) {

        // TODO: isWebSocket flag is not specified, but the assumption is that

        // such a request will never be made on a connection that will be returned

        // to the connection pool (we might need to revisit this constructor later)

        this.method = method;

        this.systemHeaders = new HttpHeadersImpl();

        this.userHeaders = ImmutableHeaders.empty();

        this.uri = URI.create("socket://" + authority.getHostString() + ":" + Integer.toString(authority.getPort()) + "/");

        this.requestProcessor = HttpRequest.noBody();

        this.authority = authority;

        this.secure = false;

        this.expectContinue = false;

        this.duration = null;

        this.version = Optional.of(client.version());

    }

    /**

     * Creates a HttpRequestImpl from the given set of Headers and the associated

     * "parent" request. Fields not taken from the headers are taken from the

     * parent.

     */

    static HttpRequestImpl createPushRequest(HttpRequestImpl parent,

                                             HttpHeadersImpl headers)

        throws IOException

    {

        return new HttpRequestImpl(parent, headers);

    }

    // only used for push requests

    private HttpRequestImpl(HttpRequestImpl parent, HttpHeadersImpl headers)

        throws IOException

    {

        this.method = headers.firstValue(":method")

                .orElseThrow(() -> new IOException("No method in Push Promise"));

        String path = headers.firstValue(":path")

                .orElseThrow(() -> new IOException("No path in Push Promise"));

        String scheme = headers.firstValue(":scheme")

                .orElseThrow(() -> new IOException("No scheme in Push Promise"));

        String authority = headers.firstValue(":authority")

                .orElseThrow(() -> new IOException("No authority in Push Promise"));

        StringBuilder sb = new StringBuilder();

        sb.append(scheme).append("://").append(authority).append(path);

        this.uri = URI.create(sb.toString());

        this.userHeaders = ImmutableHeaders.of(headers.map(), ALLOWED_HEADERS);

        this.systemHeaders = parent.systemHeaders;

        this.expectContinue = parent.expectContinue;

        this.secure = parent.secure;

        this.requestProcessor = parent.requestProcessor;

        this.acc = parent.acc;

        this.duration = parent.duration;

        this.version = parent.version;

    }

    @Override

    public String toString() {

        return (uri == null ? "" : uri.toString()) + " " + method;

    }

    @Override

    public HttpHeaders headers() {

        return userHeaders;

    }

    InetSocketAddress authority() { return authority; }

    void setH2Upgrade(Http2ClientImpl h2client) {

        systemHeaders.setHeader("Connection", "Upgrade, HTTP2-Settings");

        systemHeaders.setHeader("Upgrade", "h2c");

        systemHeaders.setHeader("HTTP2-Settings", h2client.getSettingsString());

    }

    @Override

    public boolean expectContinue() { return expectContinue; }

    InetSocketAddress proxy(HttpClientImpl client) {

        ProxySelector ps = client.proxy().orElse(null);

        if (ps == null) {

            ps = client.proxy().orElse(null);

        }

        if (ps == null || method.equalsIgnoreCase("CONNECT")) {

            return null;

        }

        return (InetSocketAddress)ps.select(uri).get(0).address();

    }

    boolean secure() { return secure; }

    @Override

    public void isWebSocket(boolean is) {

        isWebSocket = is;

    }

    boolean isWebSocket() {

        return isWebSocket;

    }

//    /** Returns the follow-redirects setting for this request. */

//    @Override

//    public jdk.incubator.http.HttpClient.Redirect followRedirects() {

//        return followRedirects;

//    }

    @Override

    public Optional<BodyProcessor> bodyProcessor() {

        return Optional.of(requestProcessor);

    }

    /**

     * Returns the request method for this request. If not set explicitly,

     * the default method for any request is "GET".

     */

    @Override

    public String method() { return method; }

    @Override

    public URI uri() { return uri; }

    @Override

    public Duration duration() {

        return duration;

    }

//    HttpClientImpl client() {

//        return client;

//    }

    HttpHeaders getUserHeaders() { return userHeaders; }

    HttpHeadersImpl getSystemHeaders() { return systemHeaders; }

    @Override

    public Optional<HttpClient.Version> version() { return version; }

    void addSystemHeader(String name, String value) {

        systemHeaders.addHeader(name, value);

    }

    @Override

    public void setSystemHeader(String name, String value) {

        systemHeaders.setHeader(name, value);

    }

//    @Override

//    public <T> HttpResponse<T>

//    response(HttpResponse.BodyHandler<T> responseHandler)

//        throws IOException, InterruptedException

//    {

//        if (!sent.compareAndSet(false, true)) {

//            throw new IllegalStateException("request already sent");

//        }

//        MultiExchange<Void,T> mex = new MultiExchange<>(this, responseHandler);

//        return mex.response();

//    }

//

//    @Override

//    public <T> CompletableFuture<HttpResponse<T>>

//    responseAsync(HttpResponse.BodyHandler<T> responseHandler)

//    {

//        if (!sent.compareAndSet(false, true)) {

//            throw new IllegalStateException("request already sent");

//        }

//        MultiExchange<Void,T> mex = new MultiExchange<>(this, responseHandler);

//        return mex.responseAsync(null)

//                  .thenApply((HttpResponseImpl<T> b) -> (HttpResponse<T>) b);

//    }

//

//    @Override

//    public <U, T> CompletableFuture<U>

//    multiResponseAsync(HttpResponse.MultiProcessor<U, T> responseHandler)

//    {

//        if (!sent.compareAndSet(false, true)) {

//            throw new IllegalStateException("request already sent");

//        }

//        MultiExchange<U,T> mex = new MultiExchange<>(this, responseHandler);

//        return mex.multiResponseAsync();

//    }

    public InetSocketAddress getAddress(HttpClientImpl client) {

        URI uri = uri();

        if (uri == null) {

            return authority();

        }

        int port = uri.getPort();

        if (port == -1) {

            if (uri.getScheme().equalsIgnoreCase("https")) {

                port = 443;

            } else {

                port = 80;

            }

        }

        String host = uri.getHost();

        if (proxy(client) == null) {

            return new InetSocketAddress(host, port);

        } else {

            return InetSocketAddress.createUnresolved(host, port);

        }

    }

}