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package org.glassfish.jersey.server.internal.routing;

import java.util.Iterator;
import java.util.List;
import java.util.regex.MatchResult;

import javax.inject.Inject;
import javax.inject.Provider;

import org.glassfish.jersey.message.internal.TracingLogger;
import org.glassfish.jersey.server.ContainerRequest;
import org.glassfish.jersey.server.internal.ServerTraceEvent;
import org.glassfish.jersey.uri.PathPattern;

/**
 * Matches the un-matched right-hand request path to a configured
 * {@link PathPattern path pattern}.
 *
 * @author Paul Sandoz
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
class PathPatternRouter implements Router {

    /**
     * "Assisted injection" factory interface for {@link PathPatternRouter}.
     *
     * See also <a href="http://code.google.com/p/google-guice/wiki/AssistedInject">
     * assisted injection in Guice</a>.
     */
    public static class Builder {

        @Inject
        private Provider<RoutingContext> contextProvider;

        /**
         * Build a path pattern request router.
         *
         * @param routes next-level request pre-processing stages to be returned in case the request
         *               matching in the built router is successful.
         * @return a path pattern request router.
         */
        public PathPatternRouter build(final List<Route<PathPattern>> routes) {
            return new PathPatternRouter(contextProvider, routes);
        }
    }

    private final Provider<RoutingContext> contextProvider;
    private final List<Route<PathPattern>> acceptedRoutes;

    /**
     * Constructs route methodAcceptorPair that uses {@link PathPattern} instances for
     * patch matching.
     *
     * @param provider {@link RoutingContext} injection provider.
     * @param routes   next-level request routers to be returned in case the router matching
     *                 the built router is successful.
     */
    private PathPatternRouter(final Provider<RoutingContext> provider,
                              final List<Route<PathPattern>> routes) {

        this.contextProvider = provider;
        this.acceptedRoutes = routes;
    }

    @Override
    public Router.Continuation apply(final ContainerRequest request) {
        final RoutingContext rc = contextProvider.get();
        // Peek at matching information to obtain path to match
        String path = rc.getFinalMatchingGroup();

        final TracingLogger tracingLogger = TracingLogger.getInstance(request);
        tracingLogger.log(ServerTraceEvent.MATCH_PATH_FIND, path);

        Router.Continuation result = null;
        final Iterator<Route<PathPattern>> iterator = acceptedRoutes.iterator();
        while (iterator.hasNext()) {
            final Route<PathPattern> acceptedRoute = iterator.next();
            final PathPattern routePattern = acceptedRoute.routingPattern();
            final MatchResult m = routePattern.match(path);
            if (m != null) {
                // Push match result information and rest of path to match
                rc.pushMatchResult(m);
                result = Router.Continuation.of(request, acceptedRoute.next());

                //tracing
                tracingLogger.log(ServerTraceEvent.MATCH_PATH_SELECTED, routePattern.getRegex());
                break;
            } else {
                tracingLogger.log(ServerTraceEvent.MATCH_PATH_NOT_MATCHED, routePattern.getRegex());
            }
        }

        if (tracingLogger.isLogEnabled(ServerTraceEvent.MATCH_PATH_SKIPPED)) {
            while (iterator.hasNext()) {
                tracingLogger.log(ServerTraceEvent.MATCH_PATH_SKIPPED, iterator.next().routingPattern().getRegex());
            }
        }

        if (result == null) {
            // No match
            result = Router.Continuation.of(request);
        }

        return result;
    }
}
