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/*
 * Copyright 2015 the original author or authors.
 *
 * 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 ratpack.server.internal;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.PooledByteBufAllocator;
import ratpack.config.ConfigObject;
import ratpack.error.ClientErrorHandler;
import ratpack.error.ServerErrorHandler;
import ratpack.error.internal.DefaultDevelopmentErrorHandler;
import ratpack.error.internal.DefaultProductionErrorHandler;
import ratpack.error.internal.ErrorHandler;
import ratpack.exec.ExecController;
import ratpack.exec.ExecInitializer;
import ratpack.exec.ExecInterceptor;
import ratpack.exec.internal.ExecControllerInternal;
import ratpack.file.FileSystemBinding;
import ratpack.file.MimeTypes;
import ratpack.file.internal.ActivationBackedMimeTypes;
import ratpack.file.internal.FileRenderer;
import ratpack.form.internal.FormParser;
import ratpack.func.Function;
import ratpack.handling.Redirector;
import ratpack.handling.RequestId;
import ratpack.handling.internal.DefaultRedirector;
import ratpack.handling.internal.UuidBasedRequestIdGenerator;
import ratpack.health.internal.HealthCheckResultsRenderer;
import ratpack.http.client.HttpClient;
import ratpack.jackson.JsonRender;
import ratpack.jackson.internal.JsonParser;
import ratpack.jackson.internal.JsonRenderer;
import ratpack.registry.Registry;
import ratpack.registry.RegistryBuilder;
import ratpack.render.Renderable;
import ratpack.render.Renderer;
import ratpack.render.internal.CharSequenceRenderer;
import ratpack.render.internal.PromiseRenderer;
import ratpack.render.internal.PublisherRenderer;
import ratpack.render.internal.RenderableRenderer;
import ratpack.server.*;
import ratpack.sse.ServerSentEventStreamClient;

import java.nio.file.Path;
import java.time.Clock;

import static ratpack.util.Exceptions.uncheck;
import static ratpack.util.internal.ProtocolUtil.HTTPS_SCHEME;
import static ratpack.util.internal.ProtocolUtil.HTTP_SCHEME;

public abstract class ServerRegistry {
  public static Registry serverRegistry(RatpackServer ratpackServer, ExecControllerInternal execController, ServerConfig serverConfig, Function userRegistryFactory) {
    Registry baseRegistry = buildBaseRegistry(ratpackServer, execController, serverConfig);
    Registry userRegistry = buildUserRegistry(userRegistryFactory, baseRegistry);

    execController.setInterceptors(ImmutableList.copyOf(userRegistry.getAll(ExecInterceptor.class)));
    execController.setInitializers(ImmutableList.copyOf(userRegistry.getAll(ExecInitializer.class)));

    return baseRegistry.join(userRegistry);
  }

  private static Registry buildUserRegistry(Function userRegistryFactory, Registry baseRegistry) {
    Registry userRegistry;
    try {
      userRegistry = userRegistryFactory.apply(baseRegistry);
    } catch (Exception e) {
      Throwables.propagateIfPossible(e);
      throw new StartupFailureException("Failed to build user registry", e);
    }
    return userRegistry;
  }

  public static Registry buildBaseRegistry(RatpackServer ratpackServer, ExecController execController, ServerConfig serverConfig) {
    ErrorHandler errorHandler = serverConfig.isDevelopment() ? new DefaultDevelopmentErrorHandler() : new DefaultProductionErrorHandler();

    RegistryBuilder baseRegistryBuilder;
    try {
      PromiseRenderer promiseRenderer = new PromiseRenderer();
      PublisherRenderer publisherRenderer = new PublisherRenderer();

      baseRegistryBuilder = Registry.builder()
        .add(ServerConfig.class, serverConfig)
        .add(ByteBufAllocator.class, PooledByteBufAllocator.DEFAULT)
        .add(ExecController.class, execController)
        .add(MimeTypes.class, new ActivationBackedMimeTypes())
        .add(PublicAddress.class, serverConfig.getPublicAddress() == null ? new InferringPublicAddress(serverConfig.getSslContext() == null ? HTTP_SCHEME : HTTPS_SCHEME) : PublicAddress.of(serverConfig.getPublicAddress()))
        .add(Redirector.class, new DefaultRedirector())
        .add(ClientErrorHandler.class, errorHandler)
        .add(ServerErrorHandler.class, errorHandler)
        .add(Renderer.typeOf(Path.class), new FileRenderer())
        .add(Renderer.typeOf(promiseRenderer.getType()), promiseRenderer)
        .add(Renderer.typeOf(publisherRenderer.getType()), publisherRenderer)
        .add(Renderer.typeOf(Renderable.class), new RenderableRenderer())
        .add(Renderer.typeOf(CharSequence.class), new CharSequenceRenderer())
        .add(Renderer.typeOf(JsonRender.class), new JsonRenderer())
        .add(FormParser.class, new FormParser())
        .add(Clock.class, Clock.systemDefaultZone())
        .add(JsonParser.class, new JsonParser())
        .add(RatpackServer.class, ratpackServer)
        .add(ObjectMapper.class, new ObjectMapper())
          // TODO remove Stopper, and just use RatpackServer instead (will need to update perf and gradle tests)
        .add(Stopper.class, () -> uncheck(() -> {
          ratpackServer.stop();
          return null;
        }))
        .add(HttpClient.class, HttpClient.httpClient(PooledByteBufAllocator.DEFAULT, serverConfig.getMaxContentLength()))
        .add(ServerSentEventStreamClient.class, ServerSentEventStreamClient.sseStreamClient(PooledByteBufAllocator.DEFAULT))
        .add(HealthCheckResultsRenderer.class, new HealthCheckResultsRenderer())
        .add(RequestId.Generator.class, new UuidBasedRequestIdGenerator());

      addConfigObjects(serverConfig, baseRegistryBuilder);
    } catch (Exception e) {
      // Uncheck because it really shouldn't happen
      throw uncheck(e);
    }

    if (serverConfig.isHasBaseDir()) {
      baseRegistryBuilder.add(FileSystemBinding.class, serverConfig.getBaseDir());
    }

    return baseRegistryBuilder.build();
  }

  private static void addConfigObjects(ServerConfig serverConfig, RegistryBuilder baseRegistryBuilder) {
    for (ConfigObject configObject : serverConfig.getRequiredConfig()) {
      addConfigObject(baseRegistryBuilder, configObject);
    }
  }

  private static  void addConfigObject(RegistryBuilder baseRegistryBuilder, ConfigObject configObject) {
    baseRegistryBuilder.add(configObject.getType(), configObject.getObject());
  }
}