/* this belongs to the WebRaveler package */
package webraveler.vurl;

import java.io.*;

import webraveler.http.HTTPRequest;
import webraveler.http.HTTPResponse;
import webraveler.proxy.ProxyClient;
import webraveler.ravel.PluginCallbackException;
import webraveler.ravel.Raveler;
import webraveler.ravel.RavelerException;
import webraveler.ravel.RavelerUser;


/**
 * This VURL allows documents to be fetched from the Web without having
 * the banner added.
 *
 * @author The Web Raveler Development Squad
 * @version 1.0
 */
public class GetUnframedDocumentVURL implements VURL {
	private boolean DEBUG = false;
	
	/**
	 *
	 */
	public GetUnframedDocumentVURL() {
	} // GetUnframedDocumentVURL()
	
	
	/**
	 * Use ProxyClient to get a fresh copy of the resource identified by the query
	 * string.  Return null if ProxyClient reports an error getting the requested
	 * resource.
	 *
	 * @param username the String containing the current RavelerUser's name
	 * @param request the HTTPRequest we're messing with here
	 * @param query the String containing the query added to the VURL (should be null)
	 * @param ravel the current Raveler instance
	 */
	public HTTPResponse resolveVURL(String username, String query, HTTPRequest request, Raveler ravel) {
		if ( DEBUG ) System.out.println("GetUnframedDocumentVURL: query string = \""+query+"\"");
		if ( DEBUG ) System.out.println("GUDVURL: username = "+username);
		HTTPResponse response = null;
		RavelerUser currentUser = new RavelerUser();
		ProxyClient proxy;
		
		/* get the user object from the running instance of Raveler */
		try {
			currentUser = ravel.getUser(username);
		} catch (RavelerException re) {
			if ( DEBUG ) System.out.println("GetUnframedDocumentVURL: "+re.getMessage());
			//ravel.printError("GetUnframedDocumentVURL",new RavelerError(re.getMessage()),request.uriString());
			response = ravel.getOriginResponse(request);
			//ravel.handleErrors(response,request.uriString());
			return addTitleFixer(response);
		} //catch
		/* Set the url of the request to the query - the url to retrieve */
		request.setUriString(query);
		/* Change the remote host and port to that of the query url */
		request.setRemoteHost(new String());
		request.setRemotePort(0);
		try{ request.parseURI(query); }catch(IOException ioe) {request.setUriString("");}
		/* Change the host header to that of the query url */
		request.deleteHeader("Host");
		request.setHeader("Host",request.remoteHost());
		
		request = fixStupidRedirects(request);
		
		/* send the request through the plugins */
		try {
			request = ravel.passThroughPlugins(currentUser, request);
		} catch( PluginCallbackException pce ) {
			if ( DEBUG ) System.out.println("GUDVURL: Plugin generated callback response.");
			return pce.getResponse();
		}//catch
		
		response = ravel.getOriginResponse(request);
		
		/* check for a redirect, and return the new document if applicable */
		if ( response.isRedirect() ) {
			if ( DEBUG ) System.out.println("GetUnframedDocumentVURL: HANDLING REDIRECT.");
			//response = handleRedirect(response,ravel);
			/* make the "location" header a virtual URL */
			String redirectLocation = (String) response.getHeader("Location");
			if ( redirectLocation != null ) {
				if ( DEBUG ) System.out.println("redirect location = "+redirectLocation);
				
				/* [partial] fix for STUPID relative locations */
				if ( !redirectLocation.startsWith("http://") )
					if ( redirectLocation.startsWith("/") )
						redirectLocation = "http://" + request.remoteHost() + redirectLocation;
					else 
						redirectLocation = request.uriString().substring(0,request.uriString().lastIndexOf("/")+1) + redirectLocation;
				redirectLocation = "http://temp.webraveler2.getunframeddocument/getunframeddocument!"+redirectLocation;
				response.setHeader("Location",redirectLocation);
			}//if
			return addTitleFixer(response); /* this is the original redirect, with the location header modified */
		}//if
		
		/* try making an HTMLPage object to represent the content, if applicable.
		 * also, we have to make URLs absolute, using VURLs. */
		String contentType;
		contentType = (String) response.getHeader("content-type");
		if ( DEBUG ) System.out.println("GetUnframedDocumentVURL: "+query+" content-type = '"+contentType+"'");
		if ( contentType != null && contentType.startsWith("text/html")) {
			if ( DEBUG ) System.out.println("GUDVURL: making urls absolute.");
			response.getHtmlPage().makeURLsAbsolute(request,response);
			response.setHeader("Pragma","nocache");
			response.setHeader("Expires","-1");
			if ( DEBUG ) System.out.println("GUDVURL: done making urls absolute.");
		}//if
		
		/* pass the response through the plugins */
		response = ravel.passThroughPlugins(currentUser,response,request.uriString());
		if (response == null) {
			response = Raveler.generateErrorResponse();
			if ( DEBUG ) System.out.println("GetUnframedDocumentVURL: getResponse() returned null.  Generating error response.");
		}//if
		else {
			/* Insert a link to the errors/warnings */
			response = ravel.handleErrors(response,request.uriString());
		}
		
		//System.out.println("GetUnframedDocumentVURL: '"+response.print()+"'");
		//if ( response.getHtmlPage() != null) {
	//		response.entityText = response.htmlPage.toString();
	//		response.entityBytes = response.entityText.getBytes();
	//		response.setHeader("Content-Length",""+response.entityBytes.length);
	//	}
		// response.getHtmlPage().insertInHead("<meta HTTP-EQUIV=\"Pragma\" CONTENT=\"no-cache\">\n");
		response.correctContentLength();
		return addTitleFixer(response);
	} // resolveVURL
	
	
	private HTTPResponse addTitleFixer(HTTPResponse resp) {
		if ( resp.getHeader("Content-Type").startsWith("text/html") ) {
		//	System.out.println("\n\nFIXING TITLE\n\n");
			//resp.htmlPage.insertAtTop("<script language=\"JavaScript\" type=\"text/javascript\">\n<!-- \nalert(\"the document title is '\"+top.banner.document.title+\"'\")\n\n// -->\n</script>");
			//resp.htmlPage.insertAtTop("<script language=\"JavaScript\" type=\"text/javascript\">\n<!-- \nwebravelerSetTitle()\n// -->\n</script>");
			//resp.entityText = resp.htmlPage.toString();
			//resp.entityBytes = resp.entityText.getBytes();
			//resp.setHeader("Content-Length",resp.entityBytes.length+"");
		}
		return resp;
	}
	
	
	
	/**
	 * Given an HTTPResponse with a redirect (status 302), forward the original request
	 * to the new location (as per the location header), and return the response received.
	 *
	 * @param response an HTTPResponse containing a redirect
	 * @param ravel the Raveler instance we're currently dealing with
	 * @return         the resource the redirect refers us to
	 */
	public HTTPResponse handleRedirect(HTTPResponse response,Raveler ravel) {
		String location = (String) response.getHeader("Location");
		HTTPResponse redirectResponse = new HTTPResponse();
		if ( location == null ) {
			return Raveler.generateErrorResponse();
		}//if
		else {
			HTTPRequest request = HTTPRequest.generateGetRequest(location);
			ProxyClient proxy = new ProxyClient(request);
			try {
				redirectResponse = proxy.getResponse();
			}catch(IOException ioe) {
				return Raveler.generateErrorResponse();
			} //catch
			
			/* if there's another redirect, handle it, too */
			if ( redirectResponse.isRedirect() ) {
				redirectResponse = handleRedirect(redirectResponse, ravel);
			}//if
		}//else
		
		return redirectResponse;
	}//handleRedirect
	
	
	private HTTPRequest fixStupidRedirects(HTTPRequest req){
		if ( req.uriString().indexOf("http//",1) != -1 ) {
			StringBuffer newUri = new StringBuffer();
			newUri.append(req.uriString().substring(req.uriString().indexOf("http//")));
			newUri.insert(4,":");
			req.setUriString(newUri.toString());
			try { req.parseURI(newUri.toString()); } catch(IOException ioe) {}
		}
		return req;
	}
	
} // class GetUnframedDocumentVURL