package nabble.view.lib;

import java.io.IOException;
import java.util.Collections;
import java.util.Map;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import fschmidt.util.servlet.JtpContext;
import fschmidt.util.servlet.UrlMapper;
import fschmidt.util.servlet.UrlMapping;
import nabble.view.web.template.UrlMapperNamespace;


public final class UrlMapperImpl implements UrlMapper {

	private static class RegexToClass {
		private final Pattern ptn;
		private final Class cls;

		public RegexToClass(Class cls) {
			if( !UrlMappable.class.isAssignableFrom(cls) )
				throw new RuntimeException(cls.getName()+" doesn't implement UrlMappable");
			this.cls = cls;
			try {
				this.ptn = ((UrlMappable)cls.newInstance()).getUrlPattern();
			} catch(InstantiationException e) {
				throw new RuntimeException(e);
			} catch(IllegalAccessException e) {
				throw new RuntimeException(e);
			}
		}
	}

	private final RegexToClass[] regexToClass;

	UrlMapperImpl(final Class[] classes) {
		RegexToClass[] regexToClass = new RegexToClass[classes.length];
		for( int i=0; i<classes.length; i++ ) {
			regexToClass[i] = new RegexToClass(classes[i]);
		}
		this.regexToClass = regexToClass;
	}

	public UrlMapping getUrlMapping(HttpServletRequest request) {
		String url = request.getRequestURL().toString();
/*
		if( Jtp.getSite(request) == null && !url.startsWith(Jtp.defaultContextUrl()) )
			return redir;
*/
		UrlMapping urlMapping = UrlMapperNamespace.getUrlMapping(request);
		if( urlMapping != null )
			return urlMapping;
		int i = url.indexOf(';');
		if( i != -1 )
			url = url.substring(0,i);
		for (RegexToClass rc : regexToClass) {
			if (rc.ptn.matcher(url).find()) {
				try {
					UrlMappable ubm = (UrlMappable)rc.cls.newInstance();
					Map<String,String[]> params = ubm.getParameterMapFromUrl(request,url);
					return new UrlMapping(rc.cls,params);
				} catch(IllegalAccessException e) {
					throw new RuntimeException(e);
				} catch(InstantiationException e) {
					throw new RuntimeException(e);
				}
			}
		}
		return null;
	}
/*
	public static class Redir extends HttpServlet {
		protected void service(HttpServletRequest request,HttpServletResponse response)
			throws IOException
		{
			response.setHeader("Location", "http://www.jmeter-archive.org/missing.html");
			response.sendError(HttpServletResponse.SC_MOVED_PERMANENTLY);
		}
	}
	private static final UrlMapping redir = new UrlMapping(Redir.class,Collections.emptyMap());
*/
}