package nabble.utils;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import luan.Luan;
import luan.LuanException;
import nabble.utils.luan.HttpServicer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


public class LuanServlet extends HttpServlet {
	private static final Logger logger = LoggerFactory.getLogger(LuanServlet.class);
	protected final String uriPrefix;
	protected final HttpServicer httpServicer;

	private LuanServlet(String uriPrefix,Luan luan) {
		this.uriPrefix = uriPrefix;
		try {
			luan.eval("require 'classpath:nabble/utils/init.luan'");
		} catch(LuanException e) {
			throw new RuntimeException(e);
		}
		this.httpServicer = new HttpServicer(luan);
	}

	public LuanServlet(String uriPrefix) {
		this(uriPrefix,new Luan());
	}

	@Override protected void service(HttpServletRequest request,HttpServletResponse response)
		throws IOException
	{
		String path = request.getRequestURI();
		service(request,response,path);
	}

	public void service(HttpServletRequest request,HttpServletResponse response,String path)
		throws IOException
	{
		if( !path.endsWith(".luan") )
			throw new RuntimeException("'"+path+"' doesn't end with '.luan'");
		String uri = uriPrefix + path;
		try {
			if( !httpServicer.service(request,response,uri) )
				response.sendError(HttpServletResponse.SC_NOT_FOUND);
		} catch(LuanException e) {
//			throw new RuntimeException(e);
			String err = e.getLuanStackTraceString();
			logger.error(err);
			response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,"<pre>"+err+"</pre>");
		}
	}

}