/*
 * LingPipe v. 3.7
 * Copyright (C) 2003-2008 Alias-i
 *
 * This program is licensed under the Alias-i Royalty Free License
 * Version 1 WITHOUT ANY WARRANTY, without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the Alias-i
 * Royalty Free License Version 1 for more details.
 *
 * You should have received a copy of the Alias-i Royalty Free License
 * Version 1 along with this program; if not, visit
 * http://alias-i.com/lingpipe/licenses/lingpipe-license-1.txt or contact
 * Alias-i, Inc. at 181 North 11th Street, Suite 401, Brooklyn, NY 11211,
 * +1 (718) 290-9170.
 */

package com.aliasi.demo.framework;

import com.aliasi.util.AbstractCommand;
import com.aliasi.util.Streams;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import java.net.URL;
import java.net.URLConnection;

import java.util.Properties;

/**
 * The <code>DemoClient</code> provides a simple command-line
 * client for the web services demos.  That is, this command
 * may be used to access a demo running on the web, specifying
 * properties for the web demo through the command line.  The
 * client connects to the web service version of the web demo
 * using a socket and then writes output to standard out.
 *
 * @author  Bob Carpenter
 * @version 2.3.0
 * @since   LingPipe2.3
 */
public class DemoClient extends AbstractCommand {

    private static final Properties DEFAULT_PROPERTIES
        = new Properties();

    DemoClient(String[] args) {
        super(args,DEFAULT_PROPERTIES);
    }

    /**
     * Runs the client from the command line, with arguments specified
     * as for the command demos.  Output is written to standard output.
     *
     * @param args Command-line arguments.
     */
    public static void main(String[] args) {
        new DemoClient(args).run();
    }

    /**
     * Does the actual processing for the client, which involves
     * URL-encoding properties from the command-line, connecting
     * to a web service demo via socket, sending it the URL,
     * and reading the results and printing to standard output.
     */
    public void run() {
        InputStream clientIn = null;
        OutputStream clientOut = null;
        InputStream serverIn = null;
        OutputStream serverOut = null;
        try {
            String urlName = getArgument("serverUrl");
            URL url = new URL(urlName);
            URLConnection connection = url.openConnection();
            connection.setRequestProperty("Content-type", "text/plain");
            connection.setDoOutput(true);
            serverOut = connection.getOutputStream();
            String inputFileName = getArgument("inputFile");
            if (inputFileName == null)
                clientIn = System.in;
            else
                clientIn = new FileInputStream(inputFileName);
            Streams.copy(clientIn,serverOut);

            String outputFileName = getArgument("outputFile");
            if (outputFileName == null)
                clientOut = System.out;
            else
                clientOut = new FileOutputStream(outputFileName);
            serverIn = connection.getInputStream();
            Streams.copy(serverIn,clientOut);
        } catch (Exception e) {
            System.out.println("Exception=" + e);
            e.printStackTrace(System.out);
        } finally {
            Streams.closeInputStream(serverIn);
            Streams.closeOutputStream(serverOut);
            Streams.closeInputStream(clientIn);
            Streams.closeOutputStream(clientOut);
        }
    }

}