package net.floodlightcontroller.bgproute;

import org.restlet.resource.Get;
import org.restlet.resource.Post;
import org.restlet.resource.Delete;
import org.restlet.resource.ServerResource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import net.floodlightcontroller.restclient.RestClient;

public class BgpRouteResource extends ServerResource {
    
	protected static Logger log = LoggerFactory
            .getLogger(BgpRouteResource.class);
	
	private String addrToString(byte [] addr) {
	    String str = "";
		
		for (int i = 0; i < 4; i++) {
			int val = (addr[i] & 0xff);
			str += val;
			if (i != 3)
				str += ".";
		}
		
		return str;
	}
	
	@SuppressWarnings("unused")
    @Get
	public String get(String fmJson) {
		String dest = (String) getRequestAttributes().get("dest");
		String output = "";
		IBgpRouteService bgpRoute = (IBgpRouteService)getContext().getAttributes().
                get(IBgpRouteService.class.getCanonicalName());
		
		if (dest != null) {
			Prefix p = new Prefix(dest, 32);
			if (p == null) {
				return "[GET]: dest address format is wrong";
			}
			byte [] nexthop = bgpRoute.lookupRib(p.getAddress()).nextHop.getAddress();
			if (nexthop != null) {
				output += "{\"result\": \"" + addrToString(nexthop) + "\"}\n";
			} else {
				output += "{\"result\": \"Nexthop does not exist\"}\n";
			}
		} else {
			Ptree ptree = bgpRoute.getPtree();
			output += "{\n  \"rib\": [\n";
			boolean printed = false;
			for (PtreeNode node = ptree.begin(); node != null; node = ptree.next(node)) {
				if (node.rib == null) {
					continue;
				}
				if (printed == true) {
					output += ",\n";
				}
				output += "    {\"prefix\": \"" + addrToString(node.key) + "/" + node.keyBits +"\", ";
				output += "\"nexthop\": \"" + addrToString(node.rib.nextHop.getAddress()) +"\"}";
				printed = true;
			}
			//output += "{\"router_id\": \"" + addrToString(node.rib.routerId.getAddress()) +"\"}\n";
			output += "\n  ]\n}\n";
		}
		
		return output;
	}
	@Post
	public String store(String fmJson) {
        IBgpRouteService bgpRoute = (IBgpRouteService)getContext().getAttributes().
                get(IBgpRouteService.class.getCanonicalName());

	    Ptree ptree = bgpRoute.getPtree();

		String router_id = (String) getRequestAttributes().get("routerid");
		String prefix = (String) getRequestAttributes().get("prefix");
		String mask = (String) getRequestAttributes().get("mask");
		String nexthop = (String) getRequestAttributes().get("nexthop");
		String capability = (String) getRequestAttributes().get("capability");
		String reply = null;
		
		if (capability == null) {
			// this is a prefix add
			Prefix p = new Prefix(prefix, Integer.valueOf(mask));
			PtreeNode node = ptree.acquire(p.getAddress(), p.masklen);
			Rib rib = new Rib(router_id, nexthop, p.masklen);

			if (node.rib != null) {
				node.rib = null;
				ptree.delReference(node);
			}
			node.rib = rib;
			
			reply = "[POST: " + prefix + "/" + mask + ":" + nexthop + "]";
			log.info(reply);
			
			RestClient.get("http://localhost:5000/bgp_update");
		}
		
		return reply + "\n";
	}
	
	@Delete
	public String delete(String fmJson) {
        IBgpRouteService bgpRoute = (IBgpRouteService)getContext().getAttributes().
                get(IBgpRouteService.class.getCanonicalName());

        Ptree ptree = bgpRoute.getPtree();
		
		String routerId = (String) getRequestAttributes().get("routerid");
		String prefix = (String) getRequestAttributes().get("prefix");
		String mask = (String) getRequestAttributes().get("mask");
		String nextHop = (String) getRequestAttributes().get("nexthop");
		String capability = (String) getRequestAttributes().get("capability");
		String reply = null;
		
		if (capability == null) {
			// this is a prefix delete
			Prefix p = new Prefix(prefix, Integer.valueOf(mask));
			PtreeNode node = ptree.lookup(p.getAddress(), p.masklen);
			Rib r = new Rib(routerId, nextHop, p.masklen);

			if (node != null && node.rib != null) {
				if (r.equals(node.rib)) {
					node.rib = null;
					ptree.delReference(node);
				}
			}
			
			reply = "[DELE: " + prefix + "/" + mask + ":" + nextHop + "]";
			log.info(reply);
			
			RestClient.get("http://localhost:5000/bgp_update");
		}

		return reply + "\n";
	}
}