/*-
 * ============LICENSE_START=======================================================
 * ONAP - SO
 * ================================================================================
 * Copyright (C) 2018 Huawei Technologies Co., Ltd. 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.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.mso.bpmn.common.recipe;

import java.io.IOException;
import java.security.GeneralSecurityException;

import javax.xml.bind.DatatypeConverter;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
import org.openecomp.mso.logger.MessageEnum;
import org.openecomp.mso.logger.MsoLogger;
import org.openecomp.mso.properties.MsoJavaProperties;
import org.openecomp.mso.properties.MsoPropertiesFactory;
import org.openecomp.mso.utils.CryptoUtils;

/**
 * Support to call resource recipes from the BPMN workflow.
 * Such as call resource recipe in service workflow.
 * <br>
 * <p>
 * </p>
 * 
 * @author
 * @version ONAP Beijing Release 2018-02-27
 */
public class BpmnRestClient {

    public static final String DEFAULT_BPEL_AUTH = "admin:admin";

    public static final String ENCRYPTION_KEY = "aa3871669d893c7fb8abbcda31b88b4f";

    public static final String CONTENT_TYPE_JSON = "application/json";

    public static final String CAMUNDA_AUTH = "camundaAuth";

    private final static String MSO_PROP_APIHANDLER_INFRA = "MSO_PROP_APIHANDLER_INFRA";

    private static MsoPropertiesFactory msoPropertiesFactory = new MsoPropertiesFactory();

    private static MsoLogger msoLogger = MsoLogger.getMsoLogger(MsoLogger.Catalog.BPEL);

    private static boolean noProperties = true;

    public synchronized static MsoJavaProperties loadMsoProperties() {
        MsoJavaProperties msoProperties;
        try {
            msoProperties = msoPropertiesFactory.getMsoJavaProperties(MSO_PROP_APIHANDLER_INFRA);
        } catch(Exception e) {
            msoLogger.error(MessageEnum.APIH_LOAD_PROPERTIES_FAIL, MSO_PROP_APIHANDLER_INFRA, "", "", MsoLogger.ErrorCode.DataError,
                    "Exception when loading MSO Properties", e);
            return null;
        }

        if(msoProperties != null && msoProperties.size() > 0) {
            noProperties = false;
            msoLogger.info(MessageEnum.APIH_PROPERTY_LOAD_SUC, "", "");
            return msoProperties;
        } else {
            msoLogger.error(MessageEnum.APIH_NO_PROPERTIES, MSO_PROP_APIHANDLER_INFRA, "", "", MsoLogger.ErrorCode.DataError,
                    "No MSO APIH_INFRA Properties found");
            return null;
        }
    }

    public synchronized static final boolean getNoPropertiesState() {
        return noProperties;
    }

    /**
     * post the recipe Uri
     * <br>
     * 
     * @param recipeUri The request recipe uri
     * @param requestId the request id
     * @param recipeTimeout The recipe time out
     * @param requestAction The request action
     * @param serviceInstanceId The service instance id
     * @param serviceType The service Type
     * @param requestDetails The request Details, these information is from runtime
     * @param recipeParamXsd The recipe params, its from recipe design
     * @return The response of the recipe.
     * @throws ClientProtocolException
     * @throws IOException
     * @since ONAP Beijing Release
     */
    public static HttpResponse post(String recipeUri, String requestId, int recipeTimeout, String requestAction, String serviceInstanceId, String serviceType,
            String requestDetails, String recipeParamXsd) throws ClientProtocolException, IOException {

        HttpClient client = HttpClientBuilder.create().build();

        HttpPost post = new HttpPost(recipeUri);
        MsoJavaProperties props = loadMsoProperties();
        RequestConfig requestConfig =
                RequestConfig.custom().setSocketTimeout(recipeTimeout).setConnectTimeout(recipeTimeout).setConnectionRequestTimeout(recipeTimeout).build();
        post.setConfig(requestConfig);
        msoLogger.debug("call the bpmn,  url:" + recipeUri);
        String jsonReq = wrapResourceRequest(requestId, recipeTimeout, requestAction, serviceInstanceId, serviceType, requestDetails, recipeParamXsd);

        StringEntity input = new StringEntity(jsonReq);
        input.setContentType(CONTENT_TYPE_JSON);
        String encryptedCredentials;
        if(props != null) {
            encryptedCredentials = props.getProperty(CAMUNDA_AUTH, null);
            if(encryptedCredentials != null) {
                String userCredentials = getEncryptedPropValue(encryptedCredentials, DEFAULT_BPEL_AUTH, ENCRYPTION_KEY);
                if(userCredentials != null) {
                    post.addHeader("Authorization", "Basic " + DatatypeConverter.printBase64Binary(userCredentials.getBytes()));
                }
            }
        }
        post.setEntity(input);
        return client.execute(post);
    }

    /**
     * prepare the resource recipe bpmn request.
     * <br>
     * 
     * @param requestId
     * @param recipeTimeout
     * @param requestAction
     * @param serviceInstanceId
     * @param serviceType
     * @param requestDetails
     * @param recipeParams
     * @return
     * @since ONAP Beijing Release
     */
    private static String wrapResourceRequest(String requestId, int recipeTimeout, String requestAction, String serviceInstanceId, String serviceType,
            String requestDetails, String recipeParams) {
        String jsonReq = null;
        if(requestId == null) {
            requestId = "";
        }
        if(requestAction == null) {
            requestAction = "";
        }
        if(serviceInstanceId == null) {
            serviceInstanceId = "";
        }

        if(requestDetails == null) {
            requestDetails = "";
        }

        try {
            ResourceRecipeRequest recipeRequest = new ResourceRecipeRequest();
            BpmnParam resourceInput = new BpmnParam();
            BpmnParam host = new BpmnParam();
            BpmnParam requestIdInput = new BpmnParam();
            BpmnParam requestActionInput = new BpmnParam();
            BpmnParam serviceInstanceIdInput = new BpmnParam();
            BpmnParam serviceTypeInput = new BpmnParam();
            BpmnParam recipeParamsInput = new BpmnParam();
            // host.setValue(parseURL());
            requestIdInput.setValue(requestId);
            requestActionInput.setValue(requestAction);
            serviceInstanceIdInput.setValue(serviceInstanceId);
            recipeParamsInput.setValue(recipeParams);
            resourceInput.setValue(requestDetails);
            recipeRequest.setHost(host);
            recipeRequest.setRequestId(requestIdInput);
            recipeRequest.setRequestAction(requestActionInput);
            recipeRequest.setServiceInstanceId(serviceInstanceIdInput);
            recipeRequest.setServiceType(serviceTypeInput);
            recipeRequest.setRecipeParams(recipeParamsInput);
            jsonReq = recipeRequest.toString();
            msoLogger.debug("request body is " + jsonReq);
        } catch(Exception e) {
            msoLogger.error(MessageEnum.APIH_WARP_REQUEST, "Camunda", "wrapVIDRequest", MsoLogger.ErrorCode.BusinessProcesssError, "Error in APIH Warp request",
                    e);
        }
        return jsonReq;
    }

    /**
     * <br>
     * 
     * @param prop
     * @param defaultValue
     * @param encryptionKey
     * @return
     * @since ONAP Beijing Release
     */
    protected static String getEncryptedPropValue(String prop, String defaultValue, String encryptionKey) {
        try {
            return CryptoUtils.decrypt(prop, encryptionKey);
        } catch(GeneralSecurityException e) {
            msoLogger.debug("Security exception", e);
        }
        return defaultValue;
    }

}