/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jclouds.googlecomputeengine.config;

import static com.google.common.base.Suppliers.compose;
import static com.google.inject.name.Names.named;
import static org.jclouds.Constants.PROPERTY_SESSION_INTERVAL;

import java.net.URI;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;

import javax.inject.Named;
import javax.inject.Singleton;

import org.jclouds.domain.Credentials;
import org.jclouds.googlecomputeengine.GoogleComputeEngineApi;
import org.jclouds.googlecomputeengine.domain.Operation;
import org.jclouds.googlecomputeengine.domain.Project;
import org.jclouds.googlecomputeengine.domain.SlashEncodedIds;
import org.jclouds.googlecomputeengine.handlers.GoogleComputeEngineErrorHandler;
import org.jclouds.googlecomputeengine.predicates.GlobalOperationDonePredicate;
import org.jclouds.googlecomputeengine.predicates.ZoneOperationDonePredicate;
import org.jclouds.http.HttpErrorHandler;
import org.jclouds.http.Uris;
import org.jclouds.http.annotation.ClientError;
import org.jclouds.http.annotation.Redirection;
import org.jclouds.http.annotation.ServerError;
import org.jclouds.json.config.GsonModule.DateAdapter;
import org.jclouds.json.config.GsonModule.Iso8601DateAdapter;
import org.jclouds.location.Provider;
import org.jclouds.location.suppliers.ImplicitLocationSupplier;
import org.jclouds.location.suppliers.implicit.FirstZone;
import org.jclouds.rest.AuthorizationException;
import org.jclouds.rest.ConfiguresHttpApi;
import org.jclouds.rest.config.HttpApiModule;
import org.jclouds.rest.suppliers.MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.base.Splitter;
import com.google.common.base.Supplier;
import com.google.common.collect.Iterables;
import com.google.inject.Provides;
import com.google.inject.Scopes;
import com.google.inject.TypeLiteral;

/**
 * Configures the GoogleCompute connection.
 *
 * @author David Alves
 */
@ConfiguresHttpApi
public class GoogleComputeEngineHttpApiModule extends HttpApiModule<GoogleComputeEngineApi> {
   public GoogleComputeEngineHttpApiModule() {
   }

   @Override
   protected void configure() {
      bind(DateAdapter.class).to(Iso8601DateAdapter.class);
      bind(new TypeLiteral<Predicate<AtomicReference<Operation>>>() {
      }).annotatedWith(named("global")).to(GlobalOperationDonePredicate.class);
      bind(new TypeLiteral<Predicate<AtomicReference<Operation>>>() {
      }).annotatedWith(named("zone")).to(ZoneOperationDonePredicate.class);
      bind(ImplicitLocationSupplier.class).to(FirstZone.class).in(Scopes.SINGLETON);
      super.configure();
   }

   @Override
   protected void bindErrorHandlers() {
      bind(HttpErrorHandler.class).annotatedWith(Redirection.class).to(GoogleComputeEngineErrorHandler.class);
      bind(HttpErrorHandler.class).annotatedWith(ClientError.class).to(GoogleComputeEngineErrorHandler.class);
      bind(HttpErrorHandler.class).annotatedWith(ServerError.class).to(GoogleComputeEngineErrorHandler.class);
   }

   @Provides
   @Singleton
   @UserProject
   public Supplier<String> supplyProject(@Provider final Supplier<Credentials> creds,
                                         final GoogleComputeEngineApi api,
                                         AtomicReference<AuthorizationException> authException,
                                         @Named(PROPERTY_SESSION_INTERVAL) long seconds) {
      return MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier.create(authException,
              compose(new Function<Credentials, String>() {
                 public String apply(Credentials in) {
                    // ID should be of the form project_id@developer.gserviceaccount.com
                    // OR (increasingly often) project_id-extended_uid@developer.gserviceaccount.com
                    // where project_id is the NUMBER;
                    // HERE we also accept simply "project" as the identity, if no "@" is present;
                    // this is used in tests, but not sure if it is valid in the wild.
                    String projectName = in.identity;
                    if (projectName.indexOf("@") != -1) {
                       projectName = Iterables.get(Splitter.on("@").split(projectName), 0);
                       if (projectName.indexOf("-") != -1) {
                          // if ID is of the form project_id-extended_uid@developer.gserviceaccount.com
                          projectName = Iterables.get(Splitter.on("-").split(projectName), 0);
                       }
                    }
                    Project project = api.getProjectApi().get(projectName);
                    return project.getName();
                 }
              }, creds), seconds, TimeUnit.SECONDS);
   }

   @Provides
   @Singleton
   @Named("machineTypeToURI")
   public Function<String, URI> provideMachineTypeNameToURIFunction(final @Provider Supplier<URI> endpoint,
                                                                    final @UserProject Supplier<String> userProject) {
      return new Function<String, URI>() {
         @Override
         public URI apply(String input) {
            SlashEncodedIds slashEncodedIds = SlashEncodedIds.fromSlashEncoded(input);
            return Uris.uriBuilder(endpoint.get()).appendPath("/projects/").appendPath(userProject.get())
                    .appendPath("/zones/").appendPath(slashEncodedIds.getFirstId())
                    .appendPath("/machineTypes/").appendPath(slashEncodedIds.getSecondId()).build();
         }
      };
   }

   @Provides
   @Singleton
   @Named("networkToURI")
   public Function<String, URI> provideNetworkNameToURIFunction(final @Provider Supplier<URI> endpoint,
                                                                final @UserProject Supplier<String> userProject) {
      return new Function<String, URI>() {
         @Override
         public URI apply(String input) {
            return Uris.uriBuilder(endpoint.get()).appendPath("/projects/").appendPath(userProject.get())
                    .appendPath("/global/networks/").appendPath(input).build();
         }
      };
   }

   @Provides
   @Singleton
   @Named("zoneToURI")
   public Function<String, URI> provideZoneNameToURIFunction(final @Provider Supplier<URI> endpoint,
                                                             final @UserProject Supplier<String> userProject) {
      return new Function<String, URI>() {
         @Override
         public URI apply(String input) {
            return Uris.uriBuilder(endpoint.get()).appendPath("/projects/").appendPath(userProject.get())
                    .appendPath("/zones/").appendPath(input).build();
         }
      };
   }
}