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 * obtain a copy of the License at
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package org.glassfish.jersey.server.internal.inject;

import java.net.URI;
import java.util.List;
import java.util.Map;

import javax.ws.rs.Uri;
import javax.ws.rs.client.ClientFactory;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.UriBuilder;

import javax.inject.Inject;

import org.glassfish.jersey.client.ClientConfig;
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.jersey.server.ServerProperties;
import org.glassfish.jersey.server.model.Parameter;
import org.glassfish.jersey.uri.ExtendedUriInfo;

import org.glassfish.hk2.api.ServiceLocator;

import com.google.common.base.Function;
import com.google.common.collect.Maps;

/**
 * Value factory provider supporting the {@link Uri} injection annotation.
 *
 * @author Pavel Bucek (pavel.bucek at oracle.com)
 */
final class WebTargetValueFactoryProvider extends AbstractValueFactoryProvider {

    @Context
    private ResourceConfig resourceConfig;

    /**
     * {@link Uri} injection resolver.
     */
    static final class InjectionResolver extends ParamInjectionResolver {

        /**
         * Create new injection resolver.
         */
        public InjectionResolver() {
            super(WebTargetValueFactoryProvider.class);
        }
    }

    private static final class WebTargetValueFactory extends AbstractHttpContextValueFactory {

        private final String uriValue;
        private final ClientConfig clientConfig;

        WebTargetValueFactory(String uriValue, ClientConfig clientConfig) {
            this.uriValue = uriValue;
            this.clientConfig = clientConfig;
        }


        @Override
        protected WebTarget get(HttpContext context) {
            // no need for try-catch - unlike for @*Param annotations, any issues with @Uri would usually be caused
            // by incorrect server code, so the default runtime exception mapping to 500 is appropriate
            final ExtendedUriInfo uriInfo = context.getUriInfo();
            URI uri = UriBuilder.fromUri(uriValue).buildFromEncodedMap(Maps.transformValues(
                    uriInfo.getPathParameters(),
                    new Function, Object>() {
                        @Override
                        public Object apply(List input) {
                            return input.isEmpty() ? null : input.get(0);
                        }
                    }
            ));
            if(!uri.isAbsolute()) {
                uri = UriBuilder.fromUri(uriInfo.getBaseUri()).path(uri.toString()).build();
            }

            if(clientConfig == null) {
                return ClientFactory.newClient().target(uri);
            } else {
                return ClientFactory.newClient(clientConfig).target(uri);
            }
        }
    }

    /**
     * Initialize the provider.
     *
     * @param locator service locator to be used for injecting into the values factory.
     */
    @Inject
    public WebTargetValueFactoryProvider(ServiceLocator locator) {
        super(null, locator, Parameter.Source.URI);
    }

    @Override
    protected AbstractHttpContextValueFactory createValueFactory(Parameter parameter) {
        String parameterName = parameter.getSourceName();
        if (parameterName == null || parameterName.length() == 0) {
            // Invalid URI parameter name
            return null;
        }

        final Class rawParameterType = parameter.getRawType();
        if (rawParameterType == WebTarget.class) {
            final Object o = resourceConfig.getProperties().get(ServerProperties.WEBTARGET_CONFIGURATION);
            ClientConfig clientConfig = null;
            if(o != null && (o instanceof Map)) {
                Map clientConfigMap = (Map) o;
                clientConfig = clientConfigMap.get(parameterName);
            }

            return new WebTargetValueFactory(parameterName, clientConfig);
        }

        return null;
    }
}