/*
Class Sender
By Martin Carlsson
Internetprogrammering 4 Course
*/
import java.net.*;
import java.io.*;
import org.jdom.output.*;
import org.jdom.*;

/**
*Class Sender creates and sends an XML document.
*@author Martin Carlsson
*/
public class Sender {
	
	private PrintWriter out;
    private Chat gui;
    private Socket socket;
	
    /**
    *Constructs a Sender object/instance
    *@param socket Socket for the connection
    *@param gui GUI reference
    */
	public Sender(Socket socket, Chat gui) {
        this.gui = gui;
        this.socket = socket;
		try {
			out = new PrintWriter(socket.getOutputStream(), true); 
		}
		catch(IOException iOe) {
            String problem = "Problem with connection to host: " + gui.getHost() + "on port: " + gui.getPort() +". Might be a problem with your Internet connection! \n" + iOe.getMessage();
            System.err.println(problem +"\n" + iOe.getMessage());
            iOe.printStackTrace();
            gui.setErrorMessage(problem);
        }
	}
	
	
	/** 
    *SCloses the output stream
    */
	public void closeOutStream() {
		
		if(out != null) 
			out.close();
	}
	
	
	/**
    **Creates an XML document object and sends it to the Chat server
    *@param n innehållet i element name
    *@param e innehållet i element email
    *@param h innehållet i element homepage
    *@param msg meddelandet som läggs till i body elementet
    */
	public void sendAway(String n, String e, String h, String msg)  {
        
        try {
            //Doctype objectet and the global elements root, header and protocol are created
            DocType dT = new DocType("message", "http://www.webpelican.com/internet-programming-4/xml-based-java-chat-client/message.dtd");
            Element root = new Element("message");
            Element header = new Element("header");
            Element protocol = new Element("protocol");
            
            //The Protocol element gets it's content and is put to the header element.
            Element type = new Element("type").addContent("CTTP");
            Element version = new Element("version").addContent("1.0");
            Element command = new Element("command").addContent("MESS");
            protocol.addContent(type);
            protocol.addContent(version);
            protocol.addContent(command);
            header.addContent(protocol);
            
           //The Id elementet is created and put in the header element
            Element id = new Element("id");
            Element name = new Element("name").addContent(n);
            Element email = new Element("email").addContent(e);
            Element homepage = new Element("homepage").addContent(h);
            Element host = new Element("host").addContent(socket.getLocalAddress().getHostName()); 
            id.addContent(name).addContent(email).addContent(homepage).addContent(host);
            header.addContent(id);
           
            //Body element is created, and the message is put as it's content.
            //Header and body is added and the XML document created.
            Element body = new Element("body").addContent(msg);
            root.addContent(header);
            root.addContent(body);
            Document doc = new Document(root, dT);
            
            Format format = Format.getCompactFormat();
            format.setLineSeparator("");
            format.setExpandEmptyElements(true);
            XMLOutputter xmlOutputter = new XMLOutputter(format);
            
            //More pretty for the command prompt
            Format prettyFormat = Format.getPrettyFormat();
            prettyFormat.setExpandEmptyElements(true);
            XMLOutputter prettyXmlOut = new XMLOutputter(prettyFormat);
            String docString = xmlOutputter.outputString(doc);
            
            //The document is sent as a string.
            //and the pretty printout is done in the command prompt      
            if(out != null)
                out.println(docString);
            System.out.println("*****Outgoing message:");    
            prettyXmlOut.output(doc, System.out);
        }
        catch(IOException iOe) {
            String problem = "Problem sending the message! Check your connection! \n" + iOe.getMessage();
            System.err.println(problem +"\n" + iOe.getMessage());
            iOe.printStackTrace();
            gui.setErrorMessage(problem);
        }
    }
} // End class Sender