package net.onrc.onos.apps.bgproute;

import java.util.Iterator;

import net.onrc.onos.apps.bgproute.RibUpdate.Operation;

import org.restlet.resource.Delete;
import org.restlet.resource.Get;
import org.restlet.resource.Post;
import org.restlet.resource.ServerResource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class BgpRouteResource extends ServerResource {
    private final static Logger log = LoggerFactory.getLogger(BgpRouteResource.class);

    @Get
    public String get(String fmJson) {
        String dest = (String) getRequestAttributes().get("dest");
        StringBuilder output = new StringBuilder(80);
        IBgpRouteService bgpRoute = (IBgpRouteService) getContext()
                .getAttributes().
                get(IBgpRouteService.class.getCanonicalName());

        if (dest == null) {
            IPatriciaTrie<RibEntry> ptree = bgpRoute.getPtree();
            output.append("{\n  \"rib\": [\n");
            boolean printed = false;

            synchronized (ptree) {
                Iterator<IPatriciaTrie.Entry<RibEntry>> it = ptree.iterator();
                while (it.hasNext()) {
                    IPatriciaTrie.Entry<RibEntry> entry = it.next();

                    if (printed) {
                        output.append(",\n");
                    }

                    output.append("    {\"prefix\": \"");
                    output.append(entry.getPrefix());
                    output.append("\", \"nexthop\": \"");
                    output.append(entry.getValue().getNextHop().getHostAddress());
                    output.append("\"}");

                    printed = true;
                }
            }

            output.append("\n  ]\n}\n");
        } else {
            // TODO Needs to be changed to use the new RestClient.get().

            // the dest here refers to router-id
            // bgpdRestIp includes port number, such as 1.1.1.1:8080
            String bgpdRestIp = bgpRoute.getBGPdRestIp();
            String url = "http://" + bgpdRestIp + "/wm/bgp/" + dest;

            // Doesn't actually do anything with the response
            RestClient.get(url);

            output.append("Get rib from bgpd finished!\n");
        }

        return output.toString();
    }

    @Post
    public String store(String fmJson) {
        IBgpRouteService bgpRoute = (IBgpRouteService) getContext()
                .getAttributes().
                get(IBgpRouteService.class.getCanonicalName());

        String strSysuptime = (String) getRequestAttributes().get("sysuptime");
        String strSequence = (String) getRequestAttributes().get("sequence");
        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");

        log.debug("sysuptime: {}", strSysuptime);
        log.debug("sequence: {}", strSequence);

        String reply = "";

        if (capability == null) {
            // this is a prefix add
            Prefix p;
            long sysUpTime, sequenceNum;
            try {
                p = new Prefix(prefix, Integer.valueOf(mask));
                sysUpTime = Long.parseLong(strSysuptime);
                sequenceNum = Long.parseLong(strSequence);
            } catch (NumberFormatException e) {
                reply = "[POST: mask format is wrong]";
                log.info(reply);
                return reply + "\n";
            } catch (IllegalArgumentException e1) {
                reply = "[POST: prefix format is wrong]";
                log.info(reply);
                return reply + "\n";
            }

            RibEntry rib = new RibEntry(routerId, nexthop, sysUpTime,
                    sequenceNum);

            bgpRoute.newRibUpdate(new RibUpdate(Operation.UPDATE, p, rib));

            reply = "[POST: " + prefix + "/" + mask + ":" + nexthop + "]";
            log.info(reply);
        } else if ("1".equals(capability)) {
            reply = "[POST-capability: " + capability + "]\n";
            log.info(reply);
            // to store the number in the top node of the Ptree
        } else {
            reply = "[POST-capability: " + capability + "]\n";
            log.info(reply);
            // to store the number in the top node of the Ptree
        }

        return reply + "\n";
    }

    @Delete
    public String delete(String fmJson) {
        IBgpRouteService bgpRoute = (IBgpRouteService) getContext()
                .getAttributes().
                get(IBgpRouteService.class.getCanonicalName());

        String strSysuptime = (String) getRequestAttributes().get("sysuptime");
        String strSequence = (String) getRequestAttributes().get("sequence");
        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");

        log.debug("sysuptime: {}", strSysuptime);
        log.debug("sequence: {}", strSequence);

        String reply = "";

        if (capability == null) {
            // this is a prefix delete
            Prefix p;
            long sysUpTime, sequenceNum;
            try {
                p = new Prefix(prefix, Integer.valueOf(mask));
                sysUpTime = Long.parseLong(strSysuptime);
                sequenceNum = Long.parseLong(strSequence);
            } catch (NumberFormatException e) {
                reply = "[DELE: mask format is wrong]";
                log.info(reply);
                return reply + "\n";
            } catch (IllegalArgumentException e1) {
                reply = "[DELE: prefix format is wrong]";
                log.info(reply);
                return reply + "\n";
            }

            RibEntry r = new RibEntry(routerId, nextHop, sysUpTime, sequenceNum);

            bgpRoute.newRibUpdate(new RibUpdate(Operation.DELETE, p, r));

            reply = reply + "[DELE: " + prefix + "/" + mask + ":" + nextHop
                    + "]";
        } else {
            // clear the local rib: Ptree
            bgpRoute.clearPtree();
            reply = "[DELE-capability: " + capability
                    + "; The local RibEntry is cleared!]\n";

            // to store the number in the top node of the Ptree
        }

        log.info(reply);
        return reply + "\n";
    }
}