/*
 * 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.apache.camel.component.aws2.kms;

import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.InvalidPayloadException;
import org.apache.camel.Message;
import org.apache.camel.support.DefaultProducer;
import org.apache.camel.util.ObjectHelper;
import org.apache.camel.util.URISupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import software.amazon.awssdk.awscore.exception.AwsServiceException;
import software.amazon.awssdk.services.kms.KmsClient;
import software.amazon.awssdk.services.kms.model.CreateKeyRequest;
import software.amazon.awssdk.services.kms.model.CreateKeyResponse;
import software.amazon.awssdk.services.kms.model.DescribeKeyRequest;
import software.amazon.awssdk.services.kms.model.DescribeKeyResponse;
import software.amazon.awssdk.services.kms.model.DisableKeyRequest;
import software.amazon.awssdk.services.kms.model.DisableKeyResponse;
import software.amazon.awssdk.services.kms.model.EnableKeyRequest;
import software.amazon.awssdk.services.kms.model.EnableKeyResponse;
import software.amazon.awssdk.services.kms.model.ListKeysRequest;
import software.amazon.awssdk.services.kms.model.ListKeysResponse;
import software.amazon.awssdk.services.kms.model.ScheduleKeyDeletionRequest;
import software.amazon.awssdk.services.kms.model.ScheduleKeyDeletionResponse;

/**
 * A Producer which sends messages to the Amazon KMS Service <a href="http://aws.amazon.com/kms/">AWS KMS</a>
 */
public class KMS2Producer extends DefaultProducer {

    private static final Logger LOG = LoggerFactory.getLogger(KMS2Producer.class);
    public static final String MISSING_KEY_ID = "Key Id must be specified";

    private transient String kmsProducerToString;

    public KMS2Producer(Endpoint endpoint) {
        super(endpoint);
    }

    @Override
    public void process(Exchange exchange) throws Exception {
        switch (determineOperation(exchange)) {
            case listKeys:
                listKeys(getEndpoint().getKmsClient(), exchange);
                break;
            case createKey:
                createKey(getEndpoint().getKmsClient(), exchange);
                break;
            case disableKey:
                disableKey(getEndpoint().getKmsClient(), exchange);
                break;
            case enableKey:
                enableKey(getEndpoint().getKmsClient(), exchange);
                break;
            case scheduleKeyDeletion:
                scheduleKeyDeletion(getEndpoint().getKmsClient(), exchange);
                break;
            case describeKey:
                describeKey(getEndpoint().getKmsClient(), exchange);
                break;
            default:
                throw new IllegalArgumentException("Unsupported operation");
        }
    }

    private KMS2Operations determineOperation(Exchange exchange) {
        KMS2Operations operation = exchange.getIn().getHeader(KMS2Constants.OPERATION, KMS2Operations.class);
        if (operation == null) {
            operation = getConfiguration().getOperation();
        }

        if (ObjectHelper.isEmpty(operation)) {
            throw new IllegalArgumentException("Operation must be specified");
        }
        return operation;
    }

    protected KMS2Configuration getConfiguration() {
        return getEndpoint().getConfiguration();
    }

    @Override
    public String toString() {
        if (kmsProducerToString == null) {
            kmsProducerToString = "KMSProducer[" + URISupport.sanitizeUri(getEndpoint().getEndpointUri()) + "]";
        }
        return kmsProducerToString;
    }

    @Override
    public KMS2Endpoint getEndpoint() {
        return (KMS2Endpoint) super.getEndpoint();
    }

    private void listKeys(KmsClient kmsClient, Exchange exchange) throws InvalidPayloadException {
        if (getConfiguration().isPojoRequest()) {
            Object payload = exchange.getIn().getMandatoryBody();
            if (payload instanceof ListKeysRequest) {
                ListKeysResponse result;
                try {
                    result = kmsClient.listKeys((ListKeysRequest) payload);
                } catch (AwsServiceException ase) {
                    LOG.trace("List Keys command returned the error code {}", ase.awsErrorDetails().errorCode());
                    throw ase;
                }
                Message message = getMessageForResponse(exchange);
                message.setBody(result);
            }
        } else {
            ListKeysRequest.Builder builder = ListKeysRequest.builder();
            if (ObjectHelper.isNotEmpty(exchange.getIn().getHeader(KMS2Constants.LIMIT))) {
                int limit = exchange.getIn().getHeader(KMS2Constants.LIMIT, Integer.class);
                builder.limit(limit);
            }
            ListKeysResponse result;
            try {
                result = kmsClient.listKeys(builder.build());
            } catch (AwsServiceException ase) {
                LOG.trace("List Keys command returned the error code {}", ase.awsErrorDetails().errorCode());
                throw ase;
            }
            Message message = getMessageForResponse(exchange);
            message.setBody(result);
        }
    }

    private void createKey(KmsClient kmsClient, Exchange exchange) throws InvalidPayloadException {
        if (getConfiguration().isPojoRequest()) {
            Object payload = exchange.getIn().getMandatoryBody();
            if (payload instanceof CreateKeyRequest) {
                CreateKeyResponse result;
                try {
                    result = kmsClient.createKey((CreateKeyRequest) payload);
                } catch (AwsServiceException ase) {
                    LOG.trace("Create Key command returned the error code {}", ase.awsErrorDetails().errorCode());
                    throw ase;
                }
                Message message = getMessageForResponse(exchange);
                message.setBody(result);
            }
        } else {
            CreateKeyRequest.Builder builder = CreateKeyRequest.builder();
            if (ObjectHelper.isNotEmpty(exchange.getIn().getHeader(KMS2Constants.DESCRIPTION))) {
                String description = exchange.getIn().getHeader(KMS2Constants.DESCRIPTION, String.class);
                builder.description(description);
            }
            CreateKeyResponse result;
            try {
                result = kmsClient.createKey(builder.build());
            } catch (AwsServiceException ase) {
                LOG.trace("Create Key command returned the error code {}", ase.awsErrorDetails().errorCode());
                throw ase;
            }
            Message message = getMessageForResponse(exchange);
            message.setBody(result);
        }
    }

    private void disableKey(KmsClient kmsClient, Exchange exchange) throws InvalidPayloadException {
        if (getConfiguration().isPojoRequest()) {
            Object payload = exchange.getIn().getMandatoryBody();
            if (payload instanceof DisableKeyRequest) {
                DisableKeyResponse result;
                try {
                    result = kmsClient.disableKey((DisableKeyRequest) payload);
                } catch (AwsServiceException ase) {
                    LOG.trace("Disable Key command returned the error code {}", ase.awsErrorDetails().errorCode());
                    throw ase;
                }
                Message message = getMessageForResponse(exchange);
                message.setBody(result);
            }
        } else {
            DisableKeyRequest.Builder builder = DisableKeyRequest.builder();
            if (ObjectHelper.isNotEmpty(exchange.getIn().getHeader(KMS2Constants.KEY_ID))) {
                String keyId = exchange.getIn().getHeader(KMS2Constants.KEY_ID, String.class);
                builder.keyId(keyId);
            } else {
                throw new IllegalArgumentException(MISSING_KEY_ID);
            }
            DisableKeyResponse result;
            try {
                result = kmsClient.disableKey(builder.build());
            } catch (AwsServiceException ase) {
                LOG.trace("Disable Key command returned the error code {}", ase.awsErrorDetails().errorCode());
                throw ase;
            }
            Message message = getMessageForResponse(exchange);
            message.setBody(result);
        }
    }

    private void scheduleKeyDeletion(KmsClient kmsClient, Exchange exchange) throws InvalidPayloadException {
        if (getConfiguration().isPojoRequest()) {
            Object payload = exchange.getIn().getMandatoryBody();
            if (payload instanceof ScheduleKeyDeletionRequest) {
                ScheduleKeyDeletionResponse result;
                try {
                    result = kmsClient.scheduleKeyDeletion((ScheduleKeyDeletionRequest) payload);
                } catch (AwsServiceException ase) {
                    LOG.trace("Schedule Key Deletion command returned the error code {}", ase.awsErrorDetails().errorCode());
                    throw ase;
                }
                Message message = getMessageForResponse(exchange);
                message.setBody(result);
            }
        } else {
            ScheduleKeyDeletionRequest.Builder builder = ScheduleKeyDeletionRequest.builder();
            if (ObjectHelper.isNotEmpty(exchange.getIn().getHeader(KMS2Constants.KEY_ID))) {
                String keyId = exchange.getIn().getHeader(KMS2Constants.KEY_ID, String.class);
                builder.keyId(keyId);
            } else {
                throw new IllegalArgumentException(MISSING_KEY_ID);
            }
            if (ObjectHelper.isNotEmpty(exchange.getIn().getHeader(KMS2Constants.PENDING_WINDOW_IN_DAYS))) {
                int pendingWindows = exchange.getIn().getHeader(KMS2Constants.PENDING_WINDOW_IN_DAYS, Integer.class);
                builder.pendingWindowInDays(pendingWindows);
            }
            ScheduleKeyDeletionResponse result;
            try {
                result = kmsClient.scheduleKeyDeletion(builder.build());
            } catch (AwsServiceException ase) {
                LOG.trace("Schedule Key Deletion command returned the error code {}", ase.awsErrorDetails().errorCode());
                throw ase;
            }
            Message message = getMessageForResponse(exchange);
            message.setBody(result);
        }
    }

    private void describeKey(KmsClient kmsClient, Exchange exchange) throws InvalidPayloadException {
        if (getConfiguration().isPojoRequest()) {
            Object payload = exchange.getIn().getMandatoryBody();
            if (payload instanceof DescribeKeyRequest) {
                DescribeKeyResponse result;
                try {
                    result = kmsClient.describeKey((DescribeKeyRequest) payload);
                } catch (AwsServiceException ase) {
                    LOG.trace("Describe Key command returned the error code {}", ase.awsErrorDetails().errorCode());
                    throw ase;
                }
                Message message = getMessageForResponse(exchange);
                message.setBody(result);
            }
        } else {
            DescribeKeyRequest.Builder builder = DescribeKeyRequest.builder();
            if (ObjectHelper.isNotEmpty(exchange.getIn().getHeader(KMS2Constants.KEY_ID))) {
                String keyId = exchange.getIn().getHeader(KMS2Constants.KEY_ID, String.class);
                builder.keyId(keyId);
            } else {
                throw new IllegalArgumentException(MISSING_KEY_ID);
            }
            DescribeKeyResponse result;
            try {
                result = kmsClient.describeKey(builder.build());
            } catch (AwsServiceException ase) {
                LOG.trace("Describe Key command returned the error code {}", ase.awsErrorDetails().errorCode());
                throw ase;
            }
            Message message = getMessageForResponse(exchange);
            message.setBody(result);
        }
    }

    private void enableKey(KmsClient kmsClient, Exchange exchange) throws InvalidPayloadException {
        if (getConfiguration().isPojoRequest()) {
            Object payload = exchange.getIn().getMandatoryBody();
            if (payload instanceof EnableKeyRequest) {
                EnableKeyResponse result;
                try {
                    result = kmsClient.enableKey((EnableKeyRequest) payload);
                } catch (AwsServiceException ase) {
                    LOG.trace("Enable Key command returned the error code {}", ase.awsErrorDetails().errorCode());
                    throw ase;
                }
                Message message = getMessageForResponse(exchange);
                message.setBody(result);
            }
        } else {
            EnableKeyRequest.Builder builder = EnableKeyRequest.builder();
            if (ObjectHelper.isNotEmpty(exchange.getIn().getHeader(KMS2Constants.KEY_ID))) {
                String keyId = exchange.getIn().getHeader(KMS2Constants.KEY_ID, String.class);
                builder.keyId(keyId);
            } else {
                throw new IllegalArgumentException(MISSING_KEY_ID);
            }
            EnableKeyResponse result;
            try {
                result = kmsClient.enableKey(builder.build());
            } catch (AwsServiceException ase) {
                LOG.trace("Enable Key command returned the error code {}", ase.awsErrorDetails().errorCode());
                throw ase;
            }
            Message message = getMessageForResponse(exchange);
            message.setBody(result);
        }
    }

    public static Message getMessageForResponse(final Exchange exchange) {
        return exchange.getMessage();
    }
}
