// Copyright (C) 2017 The Android Open Source Project
//
// Licensed 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 com.googlesource.gerrit.plugins.quota;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.LoadingCache;
import com.google.gerrit.extensions.annotations.PluginName;
import com.google.gerrit.extensions.registration.DynamicSet;
import com.google.gerrit.httpd.AllRequestFilter;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.server.IdentifiedUser.GenericFactory;
import com.google.gerrit.server.cache.CacheModule;
import com.google.gerrit.server.config.PluginConfig;
import com.google.gerrit.server.config.PluginConfigFactory;
import com.google.gerrit.server.group.SystemGroupBackend;
import com.google.inject.Inject;
import com.google.inject.Provides;
import com.google.inject.Singleton;
import com.google.inject.name.Named;
import com.google.inject.name.Names;
import com.googlesource.gerrit.plugins.quota.AccountLimitsConfig.Type;

class HttpModule extends CacheModule {
  static final String CACHE_NAME_RESTAPI_ACCOUNTID = "restapi_rate_limits_by_account";
  static final String CACHE_NAME_RESTAPI_REMOTEHOST = "restapi_rate_limits_by_ip";

  private final String restapiLimitExceededMsg;

  @Inject
  HttpModule(PluginConfigFactory pluginCF, @PluginName String pluginName) {
    final PluginConfig pc = pluginCF.getFromGerritConfig(pluginName);
    restapiLimitExceededMsg =
        new RateMsgHelper(
                Type.RESTAPI, pc.getString(RateMsgHelper.RESTAPI_CONFIGURABLE_MSG_ANNOTATION))
            .getMessageFormatMsgWithBursts();
  }

  @Override
  protected void configure() {
    DynamicSet.bind(binder(), AllRequestFilter.class).to(RestApiRateLimiter.class);
    bindConstant()
        .annotatedWith(Names.named(RateMsgHelper.RESTAPI_CONFIGURABLE_MSG_ANNOTATION))
        .to(restapiLimitExceededMsg);
  }

  @Provides
  @Named(CACHE_NAME_RESTAPI_ACCOUNTID)
  @Singleton
  public LoadingCache<Account.Id, Module.Holder> getRestApiLoadingCacheByAccountId(
      GenericFactory userFactory, AccountLimitsFinder finder) {
    return CacheBuilder.newBuilder()
        .build(new Module.HolderCacheLoaderByAccountId(Type.RESTAPI, userFactory, finder));
  }

  @Provides
  @Named(CACHE_NAME_RESTAPI_REMOTEHOST)
  @Singleton
  public LoadingCache<String, Module.Holder> getRestApiLoadingCacheByRemoteHost(
      SystemGroupBackend systemGroupBackend, AccountLimitsFinder finder) {
    return CacheBuilder.newBuilder()
        .build(new Module.HolderCacheLoaderByRemoteHost(Type.RESTAPI, systemGroupBackend, finder));
  }
}