/**
 * Razvan's public code. 
 * Copyright 2008 based on Apache license (share alike) see LICENSE.txt for details.
 */
package com.razie.pub.comms;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.MalformedURLException;
import java.net.Socket;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;

import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import razie.assets.AssetLocation;
import razie.base.AttrAccess;

import com.razie.pub.base.data.ByteArray;
import com.razie.pub.base.log.Log;
import com.sun.org.apache.xerces.internal.parsers.DOMParser;

/**
 * communications utils
 * 
 * TODO detailed docs
 * 
 * @author razvanc99
 * 
 */
public class MoreComms extends Comms {

    /**
     * Stream the response of a URL.
     * 
     * @param url can be local or remote
     * @return a string containing the text read from the URL. can be the result of a servlet, a web
     *         page or the contents of a local file. It's null if i couldn't read the file.
     */
    public static InputStream poststreamUrl(String url, AttrAccess httpArgs, String content) {
        try {
            InputStream in = null;
           
            // parse url to invoke sendPOST
            AssetLocation temploc = new AssetLocation (url); 
            String cmd = "POST " + url.replace(temploc.toHttp(), "")+ " HTTP/1.1";
            
                Socket remote =  HttpHelper.sendPOST(temploc.getHost(), Integer.decode(temploc.getPort()), 
                        cmd, httpArgs, content);
                in = remote.getInputStream();
               
                // TODO interpret the http response...error codes etc
//                if (!resCode.endsWith("200 OK")) {
//                    String msg = "Could not fetch data from url " + url + ", resCode=" + resCode;
//                    logger.trace(3, msg);
//                    CommRtException rte = new CommRtException(msg);
//                    if (uc.getContentType().endsWith("xml")) {
//                        DOMParser parser = new DOMParser();
//                        try {
//                            parser.parse(new InputSource(in));
//                        } catch (SAXException e) {
//                            RuntimeException iex = new CommRtException("Error while processing document at "
//                                    + url);
//                            iex.initCause(e);
//                            throw iex;
//                        }
//                    }
//                    throw rte;
//                }
            return in;
        } catch (MalformedURLException e) {
            throw new IllegalArgumentException(e);
        } catch (IOException e1) {
            // server/node down
            throw new RuntimeException("Connection exception for url="+url, e1);
        }
    }

    /**
     * Stream the response of a URL.
     * 
     * @param url can be local or remote
     * @return a string containing the text read from the URL. can be the result of a servlet, a web
     *         page or the contents of a local file. It's null if i couldn't read the file.
     */
    public static InputStream xpoststreamUrl2(String url, AttrAccess httpArgs, String content) {
        try {
            InputStream in = null;
                URLConnection uc = (new URL(url)).openConnection();
                // see http://www.exampledepot.com/egs/java.net/Post.html
                uc.setDoOutput(true);
                
                OutputStreamWriter wr = new OutputStreamWriter(uc.getOutputStream());
                wr.write(content);
                wr.flush();
                
                
                logger.trace(3, "hdr: ", uc.getHeaderFields());
                String resCode = uc.getHeaderField(0);
                in = uc.getInputStream();



                if (!resCode.endsWith("200 OK")) {
                    String msg = "Could not fetch data from url " + url + ", resCode=" + resCode;
                    logger.trace(3, msg);
                    RuntimeException rte = new RuntimeException(msg);
                    if (uc.getContentType().endsWith("xml")) {
                        DOMParser parser = new DOMParser();
                        try {
                            parser.parse(new InputSource(in));
                        } catch (SAXException e) {
                            RuntimeException iex = new RuntimeException("Error while processing document at "
                                    + url);
                            iex.initCause(e);
                            throw iex;
                        }
                    }
                    throw rte;
                }
            return in;
        } catch (MalformedURLException e) {
            RuntimeException iex = new IllegalArgumentException();
            iex.initCause(e);
            throw iex;
        } catch (IOException e1) {
            // server/node down
            throw new RuntimeException("Connection exception for url="+url, e1);
        }
    }

    /**
     * Serialize to string the response of a URL, via POST rather than GET.
     * 
     * @param url MUST be remotec
     * @param httpArgs the args to be sent with the HTTP request
     * @param content the content of the POST
     * @return a string containing the text read from the URL. can be the result of a servlet, a web
     *         page or the contents of a local file. It's null if i couldn't read the file.
     */
    public static String readUrlPOST(String url, AttrAccess httpArgs, String content) {
        InputStream s = poststreamUrl(url, httpArgs, content);
        if (s == null) {
            return null;
        }
        return readStream(s);
    }

    static Log logger = Log.create(Comms.class.getName());
}