/*
 * Copyright (c) 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * 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 io.helidon.integrations.examples.oci.objectstorage.jaxrs;

import java.util.Objects;

import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import com.oracle.bmc.model.BmcException;
import com.oracle.bmc.objectstorage.ObjectStorage;
import com.oracle.bmc.objectstorage.requests.GetObjectRequest;
import com.oracle.bmc.objectstorage.responses.GetObjectResponse;
import org.eclipse.microprofile.config.inject.ConfigProperty;

/**
 * A JAX-RS resource class rooted at {@code /logo}.
 *
 * @see #getLogo(String, String, String)
 */
@Path("/logo")
@ApplicationScoped
public class HelidonLogoResource {

  private final ObjectStorage client;

  private final String namespaceName;

  /**
   * Creates a new {@link HelidonLogoResource}.
   *
   * @param client an {@link ObjectStorage} client; must not be {@code
   * null}
   *
   * @param namespaceName the name of an OCI object storage namespace
   * that will be used; must not be {@code null}
   *
   * @exception NullPointerException if either parameter is {@code
   * null}
   */
  @Inject
  public HelidonLogoResource(final ObjectStorage client,
                             @ConfigProperty(name = "oci.objectstorage.namespace") final String namespaceName) {
    super();
    this.client = Objects.requireNonNull(client);
    this.namespaceName = Objects.requireNonNull(namespaceName);
  }

  /**
   * Returns a non-{@code null} {@link Response} which, if successful,
   * will contain the object stored under the supplied {@code
   * namespaceName}, {@code bucketName} and {@code objectName}.
   *
   * @param namespaceName the OCI object storage namespace to use;
   * must not be {@code null}
   *
   * @param bucketName the OCI object storage bucket name to use; must
   * not be {@code null}
   *
   * @param objectName the OCI object storage object name to use; must
   * not be {@code null}
   *
   * @return a non-{@code null} {@link Response} describing the
   * operation
   *
   * @exception NullPointerException if any of the parameters is
   * {@code null}
   */
  @GET
  @Path("/{namespaceName}/{bucketName}/{objectName}")
  @Produces(MediaType.WILDCARD)
  public Response getLogo(@PathParam("namespaceName") String namespaceName,
                          @PathParam("bucketName") final String bucketName,
                          @PathParam("objectName") final String objectName) {
    final Response returnValue;
    if (bucketName == null || bucketName.isEmpty() || objectName == null || objectName.isEmpty()) {
      returnValue = Response.status(400)
        .build();
    } else {
      if (namespaceName == null || namespaceName.isEmpty()) {
        namespaceName = this.namespaceName;
      }
      Response temp = null;
      try {
        final GetObjectRequest request = GetObjectRequest.builder()
          .namespaceName(namespaceName)
          .bucketName(bucketName)
          .objectName(objectName)
          .build();
        assert request != null;
        final GetObjectResponse response = this.client.getObject(request);
        assert response != null;
        final Long contentLength = response.getContentLength();
        assert contentLength != null;
        if (contentLength.longValue() <= 0L) {
          temp = Response.noContent()
            .build();
        } else {
          temp = Response.ok()
            .type(response.getContentType())
            .entity(response.getInputStream())
            .build();
        }
      } catch (final BmcException bmcException) {
        final int statusCode = bmcException.getStatusCode();
        temp = Response.status(statusCode)
          .build();
      } finally {
        returnValue = temp;
      }
    }
    return returnValue;
  }

}
