package org.ssdt_ohio.devel.forms.services;

import org.apache.tapestry5.SymbolConstants;
import org.apache.tapestry5.ioc.MappedConfiguration;
import org.apache.tapestry5.ioc.OrderedConfiguration;
import org.apache.tapestry5.ioc.ServiceBinder;
import org.apache.tapestry5.ioc.annotations.Local;
import org.apache.tapestry5.services.Request;
import org.apache.tapestry5.services.RequestFilter;
import org.apache.tapestry5.services.RequestHandler;
import org.apache.tapestry5.services.Response;
import org.slf4j.Logger;

import java.io.IOException;

/**
 * This module is automatically included as part of the Tapestry IoC Registry, it's a good place to configure and extend
 * Tapestry, or to place your own service definitions.
 */
public class AppModule {
    public static void bind(ServiceBinder binder) {
        // binder.bind(MyServiceInterface.class, MyServiceImpl.class);

        // Make bind() calls on the binder object to define most IoC services.
        // Use service builder methods (example below) when the implementation
        // is provided inline, or requires more initialization than simply
        // invoking the constructor.
    }

    public static void contributeFactoryDefaults(
            MappedConfiguration<String, Object> configuration) {
        // The application version number is incorprated into URLs for some
        // assets. Web browsers will cache assets because of the far future expires
        // header. If existing assets are changed, the version number should also
        // change, to force the browser to download new versions. This overrides Tapesty's default
        // (a random hexadecimal number), but may be further overriden by DevelopmentModule or
        // QaModule.
        configuration.override(SymbolConstants.APPLICATION_VERSION, "1.0-SNAPSHOT");
    }

    public static void contributeApplicationDefaults(
            MappedConfiguration<String, Object> configuration) {
        // Contributions to ApplicationDefaults will override any contributions to
        // FactoryDefaults (with the same key). Here we're restricting the supported
        // locales to just "en" (English). As you add localised message catalogs and other assets,
        // you can extend this list of locales (it's a comma separated series of locale names;
        // the first locale name is the default when there's no reasonable match).
        configuration.add(SymbolConstants.SUPPORTED_LOCALES, "en");

        // The factory default is true but during the early stages of an application
        // overriding to false is a good idea. In addition, this is often overridden
        // on the command line as -Dtapestry.production-mode=false
        configuration.add(SymbolConstants.PRODUCTION_MODE, false);

        // The application version number is incorprated into URLs for some
        // assets. Web browsers will cache assets because of the far future expires
        // header. If existing assets are changed, the version number should also
        // change, to force the browser to download new versions.
        configuration.add(SymbolConstants.APPLICATION_VERSION, "1.0-SNAPSHOT-DEV");
    }


    /**
     * This is a service definition, the service will be named "TimingFilter". The interface, RequestFilter, is used
     * within the RequestHandler service pipeline, which is built from the RequestHandler service configuration.
     * Tapestry IoC is responsible for passing in an appropriate Logger instance. Requests for static resources are
     * handled at a higher level, so this filter will only be invoked for Tapestry related requests.
     * <p/>
     * <p/>
     * Service builder methods are useful when the implementation is inline as an inner class (as here) or require some
     * other kind of special initialization. In most cases, use the static bind() method instead.
     * <p/>
     * <p/>
     * If this method was named "build", then the service id would be taken from the service interface and would be
     * "RequestFilter".  Since Tapestry already defines a service named "RequestFilter" we use an explicit service id
     * that we can reference inside the contribution method.
     */
    public RequestFilter buildTimingFilter(final Logger log) {
        return new RequestFilter() {
            public boolean service(Request request, Response response, RequestHandler handler)
                    throws IOException {
                long startTime = System.currentTimeMillis();

                try {
                    // The responsibility of a filter is to invoke the corresponding method
                    // in the handler. When you chain multiple filters together, each filter
                    // received a handler that is a bridge to the next filter.

                    return handler.service(request, response);
                } finally {
                    long elapsed = System.currentTimeMillis() - startTime;

                    log.info(String.format("Request time: %d ms", elapsed));
                }
            }
        };
    }

    /**
     * This is a contribution to the RequestHandler service configuration. This is how we extend Tapestry using the
     * timing filter. A common use for this kind of filter is transaction management or security. The @Local annotation
     * selects the desired service by type, but only from the same module.  Without @Local, there would be an error due
     * to the other service(s) that implement RequestFilter (defined in other modules).
     */
    public void contributeRequestHandler(OrderedConfiguration<RequestFilter> configuration,
                                         @Local
                                         RequestFilter filter) {
        // Each contribution to an ordered configuration has a name, When necessary, you may
        // set constraints to precisely control the invocation order of the contributed filter
        // within the pipeline.

        configuration.add("Timing", filter);
    }
}