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/*
 * 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.compute.config;

import static shaded.com.google.common.base.Suppliers.memoizeWithExpiration;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.jclouds.Constants.PROPERTY_SESSION_INTERVAL;
import static org.jclouds.googlecomputeengine.config.GoogleComputeEngineProperties.OPERATION_COMPLETE_INTERVAL;
import static org.jclouds.googlecomputeengine.config.GoogleComputeEngineProperties.OPERATION_COMPLETE_TIMEOUT;
import static org.jclouds.rest.config.BinderUtils.bindHttpApi;
import static org.jclouds.util.Predicates2.retry;

import java.net.URI;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;

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

import org.jclouds.collect.Memoized;
import org.jclouds.compute.ComputeService;
import org.jclouds.compute.ComputeServiceAdapter;
import org.jclouds.compute.config.ComputeServiceAdapterContextModule;
import org.jclouds.compute.domain.Hardware;
import org.jclouds.compute.domain.NodeMetadata;
import org.jclouds.compute.domain.OperatingSystem;
import org.jclouds.compute.domain.OsFamily;
import org.jclouds.compute.options.TemplateOptions;
import org.jclouds.domain.Location;
import org.jclouds.domain.LoginCredentials;
import org.jclouds.googlecomputeengine.compute.GoogleComputeEngineService;
import org.jclouds.googlecomputeengine.compute.GoogleComputeEngineServiceAdapter;
import org.jclouds.googlecomputeengine.compute.functions.FirewallTagNamingConvention;
import org.jclouds.googlecomputeengine.compute.functions.GoogleComputeEngineImageToImage;
import org.jclouds.googlecomputeengine.compute.functions.ImageNameToOperatingSystem;
import org.jclouds.googlecomputeengine.compute.functions.InstanceToNodeMetadata;
import org.jclouds.googlecomputeengine.compute.functions.MachineTypeToHardware;
import org.jclouds.googlecomputeengine.compute.functions.OrphanedGroupsFromDeadNodes;
import org.jclouds.googlecomputeengine.compute.functions.Resources;
import org.jclouds.googlecomputeengine.compute.functions.ResetWindowsPassword;
import org.jclouds.googlecomputeengine.compute.loaders.DiskURIToImage;
import org.jclouds.googlecomputeengine.compute.loaders.SubnetworkLoader;
import org.jclouds.googlecomputeengine.compute.options.GoogleComputeEngineTemplateOptions;
import org.jclouds.googlecomputeengine.compute.predicates.AtomicInstanceVisible;
import org.jclouds.googlecomputeengine.compute.predicates.AtomicOperationDone;
import org.jclouds.googlecomputeengine.compute.predicates.GroupIsEmpty;
import org.jclouds.googlecomputeengine.compute.strategy.CreateNodesWithGroupEncodedIntoNameThenAddToSet;
import org.jclouds.googlecomputeengine.domain.Image;
import org.jclouds.googlecomputeengine.domain.Instance;
import org.jclouds.googlecomputeengine.domain.MachineType;
import org.jclouds.googlecomputeengine.domain.Operation;
import org.jclouds.googlecomputeengine.domain.Subnetwork;
import org.jclouds.location.suppliers.ImplicitLocationSupplier;
import org.jclouds.location.suppliers.implicit.FirstZone;

import shaded.com.google.common.base.Optional;
import shaded.com.google.common.base.Function;
import shaded.com.google.common.base.Functions;
import shaded.com.google.common.base.Predicate;
import shaded.com.google.common.base.Supplier;
import shaded.com.google.common.cache.CacheBuilder;
import shaded.com.google.common.cache.CacheLoader;
import shaded.com.google.common.cache.LoadingCache;
import shaded.com.google.common.collect.ImmutableMap;
import shaded.com.google.inject.Injector;
import shaded.com.google.inject.Provides;
import shaded.com.google.inject.Scopes;
import shaded.com.google.inject.TypeLiteral;
import org.jclouds.compute.domain.internal.TemplateBuilderImpl;
import org.jclouds.compute.functions.NodeAndTemplateOptionsToStatement;
import org.jclouds.compute.functions.NodeAndTemplateOptionsToStatementWithoutPublicKey;
import org.jclouds.googlecomputeengine.compute.domain.internal.GoogleComputeEngineArbitraryCpuRamTemplateBuilderImpl;
import org.jclouds.googlecomputeengine.compute.domain.internal.RegionAndName;

public final class GoogleComputeEngineServiceContextModule
      extends ComputeServiceAdapterContextModule {

   @Override
   protected void configure() {
      super.configure();

      bind(ComputeService.class).to(GoogleComputeEngineService.class);

      bind(new TypeLiteral>() {
      }).to(GoogleComputeEngineServiceAdapter.class);

      bind(TemplateBuilderImpl.class).to(GoogleComputeEngineArbitraryCpuRamTemplateBuilderImpl.class);

      // Use compute service to supply locations, which are always zones.
      install(new LocationsFromComputeServiceAdapterModule() {
      });
      bind(new TypeLiteral>() {
      }).toInstance(Functions.identity());
      bind(ImplicitLocationSupplier.class).to(FirstZone.class);

      bind(new TypeLiteral>() {
      }).to(InstanceToNodeMetadata.class);

      bind(new TypeLiteral>() {
      }).to(MachineTypeToHardware.class);

      bind(new TypeLiteral>() {
      }).to(GoogleComputeEngineImageToImage.class);

      bind(org.jclouds.compute.strategy.impl.CreateNodesWithGroupEncodedIntoNameThenAddToSet.class)
            .to(CreateNodesWithGroupEncodedIntoNameThenAddToSet.class);

      bind(TemplateOptions.class).to(GoogleComputeEngineTemplateOptions.class);
      bind(NodeAndTemplateOptionsToStatement.class).to(NodeAndTemplateOptionsToStatementWithoutPublicKey.class);

      bind(new TypeLiteral, Set>>() {
      }).to(OrphanedGroupsFromDeadNodes.class);

      bind(new TypeLiteral>() {
      }).to(GroupIsEmpty.class);
      
      bind(new TypeLiteral>() {
      }).to(ImageNameToOperatingSystem.class);

      bind(new TypeLiteral, String>>() {
      }).to(ResetWindowsPassword.class);

      bind(FirewallTagNamingConvention.Factory.class).in(Scopes.SINGLETON);

      bind(new TypeLiteral>>() {
      }).to(DiskURIToImage.class);
      
      bind(new TypeLiteral>>() {
      }).to(SubnetworkLoader.class);

      bindHttpApi(binder(), Resources.class);
   }

   // TODO: these timeouts need thinking through.
   @Provides Predicate> operationDone(AtomicOperationDone input,
         @Named(OPERATION_COMPLETE_TIMEOUT) long timeout, @Named(OPERATION_COMPLETE_INTERVAL) long interval) {
      return retry(input, timeout, interval, MILLISECONDS);
   }

   @Provides Predicate> instanceVisible(AtomicInstanceVisible input,
         @Named(OPERATION_COMPLETE_TIMEOUT) long timeout, @Named(OPERATION_COMPLETE_INTERVAL) long interval) {
      return retry(input, timeout, interval, MILLISECONDS);
   }

   @Provides @Singleton @Memoized Supplier> hardwareByUri(
         @Memoized final Supplier> hardwareSupplier,
         @Named(PROPERTY_SESSION_INTERVAL) long seconds) {
      return memoizeWithExpiration(new Supplier>() {
         @Override public Map get() {
            ImmutableMap.Builder result = ImmutableMap.builder();
            for (Hardware hardware : hardwareSupplier.get()) {
               result.put(hardware.getUri(), hardware);
            }
            return result.build();
         }
      }, seconds, SECONDS);
   }

   @Provides @Singleton @Memoized Supplier> locationsByUri(
         @Memoized final Supplier> locations, @Named(PROPERTY_SESSION_INTERVAL) long seconds) {
      return memoizeWithExpiration(new Supplier>() {
         @Override
         public Map get() {
            ImmutableMap.Builder result = ImmutableMap.builder();
            for (Location location : locations.get()) {
               result.put(URI.create(location.getDescription()), location);
            }
            return result.build();
         }
      }, seconds, SECONDS);
   }
   
   @Override
   protected Map osFamilyToCredentials(Injector injector) {
      // GCE does not enable the 'root' account for ssh access by default, but it will create a privileged
      // user when the SSH key is provided. Populate the map to use 'jclouds' as a default user.
      ImmutableMap.Builder builder = ImmutableMap.builder();
      for (OsFamily family : OsFamily.values()) {
         switch (family) {
            case COREOS:
               builder.put(family, LoginCredentials.builder().user("core").build());
               break;
            case WINDOWS:
               builder.put(family, LoginCredentials.builder().user("Administrator").build());
               break;
            default:
               builder.put(family, LoginCredentials.builder().user("jclouds").build());
               break;
         }
      }
      return builder.build();
   }

   @Provides
   @Singleton
   protected LoadingCache> diskURIToImageMap(CacheLoader> in) {
      return CacheBuilder.newBuilder().build(in);
   }

   @Provides
   @Singleton
   protected LoadingCache> subnetworksMap(
         CacheLoader> in) {
      return CacheBuilder.newBuilder().build(in);
   }

   private static final Map toPortableNodeStatus =
         ImmutableMap.builder()
                     .put(Instance.Status.PROVISIONING, NodeMetadata.Status.PENDING)
                     .put(Instance.Status.STAGING, NodeMetadata.Status.PENDING)
                     .put(Instance.Status.RUNNING, NodeMetadata.Status.RUNNING)
                     .put(Instance.Status.STOPPING, NodeMetadata.Status.PENDING)
                     .put(Instance.Status.STOPPED, NodeMetadata.Status.SUSPENDED)
                     .put(Instance.Status.TERMINATED, NodeMetadata.Status.SUSPENDED).build();

   @Provides Map toPortableNodeStatus() {
      return toPortableNodeStatus;
   }
}