/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you 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 org.jboss.netty.example.http.snoop;

import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
import org.jboss.netty.handler.codec.http.CookieEncoder;
import org.jboss.netty.handler.codec.http.DefaultHttpRequest;
import org.jboss.netty.handler.codec.http.HttpHeaders;
import org.jboss.netty.handler.codec.http.HttpMethod;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.jboss.netty.handler.codec.http.HttpVersion;

import java.net.InetSocketAddress;
import java.net.URI;
import java.util.concurrent.Executors;

/**
 * A simple HTTP client that prints out the content of the HTTP response to
 * {@link System#out} to test {@link HttpSnoopServer}.
 */
public class HttpSnoopClient {

    private final URI uri;

    public HttpSnoopClient(URI uri) {
        this.uri = uri;
    }

    public void run() {
        String scheme = uri.getScheme() == null? "http" : uri.getScheme();
        String host = uri.getHost() == null? "localhost" : uri.getHost();
        int port = uri.getPort();
        if (port == -1) {
            if ("http".equalsIgnoreCase(scheme)) {
                port = 80;
            } else if ("https".equalsIgnoreCase(scheme)) {
                port = 443;
            }
        }

        if (!"http".equalsIgnoreCase(scheme) && !"https".equalsIgnoreCase(scheme)) {
            System.err.println("Only HTTP(S) is supported.");
            return;
        }

        boolean ssl = "https".equalsIgnoreCase(scheme);

        // Configure the client.
        ClientBootstrap bootstrap = new ClientBootstrap(
                new NioClientSocketChannelFactory(
                        Executors.newCachedThreadPool(),
                        Executors.newCachedThreadPool()));

        // Set up the event pipeline factory.
        bootstrap.setPipelineFactory(new HttpSnoopClientPipelineFactory(ssl));

        // Start the connection attempt.
        ChannelFuture future = bootstrap.connect(new InetSocketAddress(host, port));

        // Wait until the connection attempt succeeds or fails.
        Channel channel = future.awaitUninterruptibly().getChannel();
        if (!future.isSuccess()) {
            future.getCause().printStackTrace();
            bootstrap.releaseExternalResources();
            return;
        }

        // Prepare the HTTP request.
        HttpRequest request = new DefaultHttpRequest(
                HttpVersion.HTTP_1_1, HttpMethod.GET, uri.getRawPath());
        request.headers().set(HttpHeaders.Names.HOST, host);
        request.headers().set(HttpHeaders.Names.CONNECTION, HttpHeaders.Values.CLOSE);
        request.headers().set(HttpHeaders.Names.ACCEPT_ENCODING, HttpHeaders.Values.GZIP);

        // Set some example cookies.
        CookieEncoder httpCookieEncoder = new CookieEncoder(false);
        httpCookieEncoder.addCookie("my-cookie", "foo");
        httpCookieEncoder.addCookie("another-cookie", "bar");
        request.headers().set(HttpHeaders.Names.COOKIE, httpCookieEncoder.encode());

        // Send the HTTP request.
        channel.write(request);

        // Wait for the server to close the connection.
        channel.getCloseFuture().awaitUninterruptibly();

        // Shut down executor threads to exit.
        bootstrap.releaseExternalResources();
    }

    public static void main(String[] args) throws Exception {
        if (args.length != 1) {
            System.err.println(
                    "Usage: " + HttpSnoopClient.class.getSimpleName() +
                    " <URL>");
            return;
        }

        URI uri = new URI(args[0]);
        new HttpSnoopClient(uri).run();
    }
}
