/*-
 * ============LICENSE_START=======================================================
 * ONAP Policy Engine
 * ================================================================================
 * Copyright (C) 2017-2019 AT&T Intellectual Property. 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.onap.policy.pap.xacml.rest.elk.client;

import com.google.gson.Gson;

import io.searchbox.client.JestClientFactory;
import io.searchbox.client.config.HttpClientConfig;
import io.searchbox.client.http.JestHttpClient;
import io.searchbox.core.Bulk;
import io.searchbox.core.Bulk.Builder;
import io.searchbox.core.BulkResult;
import io.searchbox.core.Index;

import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;

import oasis.names.tc.xacml._3_0.core.schema.wd_17.AllOfType;
import oasis.names.tc.xacml._3_0.core.schema.wd_17.AnyOfType;
import oasis.names.tc.xacml._3_0.core.schema.wd_17.AttributeDesignatorType;
import oasis.names.tc.xacml._3_0.core.schema.wd_17.AttributeValueType;
import oasis.names.tc.xacml._3_0.core.schema.wd_17.MatchType;
import oasis.names.tc.xacml._3_0.core.schema.wd_17.PolicyType;
import oasis.names.tc.xacml._3_0.core.schema.wd_17.TargetType;

import org.onap.policy.common.logging.flexlogger.FlexLogger;
import org.onap.policy.common.logging.flexlogger.Logger;
import org.onap.policy.utils.PeCryptoUtils;
import org.onap.policy.xacml.util.XACMLPolicyScanner;

/**
 * This code will deals with parsing the XACML content on reading from
 * database(PolicyEntity, ConfigurationDataEntity and ActionBodyEntity tables)
 * and convert the data into json to do bulk operation on putting to elastic search database.
 * Which is used to support Elastic Search in Policy Application GUI to search policies.
 *
 *
 *
 * properties should be configured in policyelk.properties
 *
 */
public class ElasticSearchPolicyUpdate {

    private static final Logger LOGGER = FlexLogger.getLogger(ElasticSearchPolicyUpdate.class);
    protected static final JestClientFactory jestFactory = new JestClientFactory();

    public static void main(String[] args) {

        String elkURL = null;
        String databseUrl = null;
        String userName = null;
        String txt = null;
        String databaseDriver = null;

        String propertyFile = System.getProperty("PROPERTY_FILE");
        Properties config = new Properties();
        Path file = Paths.get(propertyFile);
        if (!file.toFile().exists()) {
            LOGGER.error("Config File doesn't Exist in the specified Path " + file.toString());
        } else {
            if (file.toString().endsWith(".properties")) {
                try {
                    InputStream in = new FileInputStream(file.toFile());
                    config.load(in);
                    elkURL = config.getProperty("policy.elk.url");
                    databseUrl = config.getProperty("policy.database.url");
                    userName = config.getProperty("policy.database.username");
                    txt = PeCryptoUtils.decrypt(config.getProperty("policy.database.password"));
                    databaseDriver = config.getProperty("policy.database.driver");
                    if (elkURL == null || databseUrl == null || userName == null || txt == null
                            || databaseDriver == null) {
                        LOGGER.error("please check the elk configuration");
                    }
                } catch (Exception e) {
                    LOGGER.error("Config File doesn't Exist in the specified Path " + file.toString(), e);
                }
            }
        }

        Builder bulk = null;

        HttpClientConfig httpClientConfig = new HttpClientConfig.Builder(elkURL).multiThreaded(true).build();
        jestFactory.setHttpClientConfig(httpClientConfig);
        JestHttpClient client = (JestHttpClient) jestFactory.getObject();

        Connection conn = null;
        Statement stmt = null;
        ResultSet result = null;

        List<Index> listIndex = new ArrayList<>();

        try {
            Class.forName(databaseDriver);
            conn = DriverManager.getConnection(databseUrl, userName, txt);
            stmt = conn.createStatement();

            String policyEntityQuery = "Select * from PolicyEntity";
            result = stmt.executeQuery(policyEntityQuery);

            while (result.next()) {
                StringBuilder policyDataString = new StringBuilder("{");
                String scope = result.getString("scope");
                String policyName = result.getString("policyName");
                if (policyName != null) {
                    policyDataString.append("\"policyName\":\"" + scope + "." + policyName + "\",");
                }
                String description = result.getString("description");
                if (description != null) {
                    policyDataString.append("\"policyDescription\":\"" + description + "\",");
                }
                Object policyData = result.getString("policydata");

                if (scope != null) {
                    policyDataString.append("\"scope\":\"" + scope + "\",");
                }
                String actionbodyid = result.getString("actionbodyid");
                String configurationdataid = result.getString("configurationdataid");

                String policyWithScopeName = scope + "." + policyName;
                String _type = null;

                if (policyWithScopeName.contains(".Config_")) {
                    policyDataString.append("\"policyType\":\"Config\",");
                    if (policyWithScopeName.contains(".Config_Fault_")) {
                        _type = "closedloop";
                        policyDataString.append("\"configPolicyType\":\"ClosedLoop_Fault\",");
                    } else if (policyWithScopeName.contains(".Config_PM_")) {
                        _type = "closedloop";
                        policyDataString.append("\"configPolicyType\":\"ClosedLoop_PM\",");
                    } else {
                        _type = "config";
                        policyDataString.append("\"configPolicyType\":\"Base\",");
                    }
                } else if (policyWithScopeName.contains(".Action_")) {
                    _type = "action";
                    policyDataString.append("\"policyType\":\"Action\",");
                } else if (policyWithScopeName.contains(".Decision_")) {
                    _type = "decision";
                    policyDataString.append("\"policyType\":\"Decision\",");
                }

                if (!"decision".equals(_type)) {
                    if (configurationdataid != null) {
                        updateConfigData(conn, configurationdataid, policyDataString);
                    }
                    if (actionbodyid != null) {
                        updateActionData(conn, actionbodyid, policyDataString);
                    }
                }

                String _id = policyWithScopeName;

                String dataString = constructPolicyData(policyData, policyDataString);
                dataString = dataString.substring(0, dataString.length() - 1);
                dataString = dataString.trim().replace(System.getProperty("line.separator"), "") + "}";
                dataString = dataString.replace("null", "\"\"");
                dataString = dataString.replaceAll("\n", "");

                try {
                    Gson gson = new Gson();
                    gson.fromJson(dataString, Object.class);
                } catch (Exception e) {
                    LOGGER.error(e);
                    continue;
                }

                if ("config".equals(_type)) {
                    listIndex.add(new Index.Builder(dataString).index("policy").type("config").id(_id).build());
                } else if ("closedloop".equals(_type)) {
                    listIndex.add(new Index.Builder(dataString).index("policy").type("closedloop").id(_id).build());
                } else if ("action".equals(_type)) {
                    listIndex.add(new Index.Builder(dataString).index("policy").type("action").id(_id).build());
                } else if ("decision".equals(_type)) {
                    listIndex.add(new Index.Builder(dataString).index("policy").type("decision").id(_id).build());
                }
            }

            result.close();
            bulk = new Bulk.Builder();
            for (int i = 0; i < listIndex.size(); i++) {
                bulk.addAction(listIndex.get(i));
            }
            BulkResult searchResult = client.execute(bulk.build());
            if (searchResult.isSucceeded()) {
                LOGGER.debug("Success");
            } else {
                LOGGER.error("Failure");
            }
        } catch (Exception e) {
            LOGGER.error("Exception Occured while performing database Operation for Elastic Search Policy Upgrade" + e);
        } finally {
            if (result != null) {
                try {
                    result.close();
                } catch (Exception e) {
                    LOGGER.error("Exception Occured while closing the resultset" + e);
                }
            }
            if (stmt != null) {
                try {
                    stmt.close();
                } catch (Exception e) {
                    LOGGER.error("Exception Occured while closing the statement" + e);
                }
            }
            if (conn != null) {
                try {
                    conn.close();
                } catch (Exception e) {
                    LOGGER.error("Exception Occured while closing the connection" + e);
                }
            }
        }
    }

    public static String constructPolicyData(Object policyContent, StringBuilder policyDataString) {
        InputStream stream = new ByteArrayInputStream(policyContent.toString().getBytes(StandardCharsets.UTF_8));
        Object policyData = XACMLPolicyScanner.readPolicy(stream);
        if (policyData instanceof PolicyType) {
            PolicyType policy = (PolicyType) policyData;
            TargetType target = policy.getTarget();
            if (target != null) {
                // Under target we have AnyOFType
                List<AnyOfType> anyOfList = target.getAnyOf();
                if (anyOfList != null) {
                    Iterator<AnyOfType> iterAnyOf = anyOfList.iterator();
                    while (iterAnyOf.hasNext()) {
                        AnyOfType anyOf = iterAnyOf.next();
                        // Under AnyOFType we have AllOFType
                        List<AllOfType> allOfList = anyOf.getAllOf();
                        if (allOfList != null) {
                            Iterator<AllOfType> iterAllOf = allOfList.iterator();
                            while (iterAllOf.hasNext()) {
                                AllOfType allOf = iterAllOf.next();
                                // Under AllOFType we have Match
                                List<MatchType> matchList = allOf.getMatch();
                                if (matchList != null) {
                                    Iterator<MatchType> iterMatch = matchList.iterator();
                                    while (iterMatch.hasNext()) {
                                        MatchType match = iterMatch.next();
                                        //
                                        // Under the match we have attribute value and
                                        // attributeDesignator. So,finally down to the actual attribute.
                                        //
                                        AttributeValueType attributeValue = match.getAttributeValue();
                                        String value = (String) attributeValue.getContent().get(0);
                                        AttributeDesignatorType designator = match.getAttributeDesignator();
                                        String attributeId = designator.getAttributeId();
                                        // First match in the target is OnapName, so set that value.
                                        if ("ONAPName".equals(attributeId)) {
                                            policyDataString.append("\"onapName\":\"" + value + "\",");
                                        }
                                        if ("RiskType".equals(attributeId)) {
                                            policyDataString.append("\"riskType\":\"" + value + "\",");
                                        }
                                        if ("RiskLevel".equals(attributeId)) {
                                            policyDataString.append("\"riskLevel\":\"" + value + "\",");
                                        }
                                        if ("guard".equals(attributeId)) {
                                            policyDataString.append("\"guard\":\"" + value + "\",");
                                        }
                                        if ("ConfigName".equals(attributeId)) {
                                            policyDataString.append("\"configName\":\"" + value + "\",");
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        return policyDataString.toString();
    }

    private static void updateConfigData(Connection conn, String configurationdataid, StringBuilder policyDataString)
            throws Exception {

        PreparedStatement pstmt = null;
        ResultSet configResult = null;
        try {
            String configEntityQuery = "Select * from ConfigurationDataEntity where configurationDataId = ?";
            pstmt = null;
            pstmt = conn.prepareStatement(configEntityQuery);
            pstmt.setString(1, configurationdataid);
            configResult = pstmt.executeQuery();
            while (configResult.next()) {
                String configBody = configResult.getString("configbody");
                String configType = configResult.getString("configtype");
                if (configBody != null) {
                    configBody = configBody.replace("null", "\"\"");
                    configBody = configBody.replace("\"", "\\\"");
                    policyDataString
                            .append("\"jsonBodyData\":\"" + configBody + "\",\"configType\":\"" + configType + "\",");
                }
            }
        } catch (Exception e) {
            LOGGER.error("Exception Occured while updating configData" + e);
            throw (e);
        } finally {
            if (configResult != null) {
                try {
                    configResult.close();
                } catch (Exception e) {
                    LOGGER.error("Exception Occured while closing the ResultSet" + e);
                }
            }
            if (pstmt != null) {
                try {
                    pstmt.close();
                } catch (Exception e) {
                    LOGGER.error("Exception Occured while closing the PreparedStatement" + e);
                }
            }
        }
    }

    private static void updateActionData(Connection conn, String actionbodyid, StringBuilder policyDataString)
            throws Exception {

        PreparedStatement pstmt = null;
        ResultSet actionResult = null;
        try {
            String actionEntityQuery = "Select * from ActionBodyEntity where actionBodyId = ?";
            pstmt = conn.prepareStatement(actionEntityQuery);
            pstmt.setString(1, actionbodyid);
            actionResult = pstmt.executeQuery();
            while (actionResult.next()) {
                String actionBody = actionResult.getString("actionbody");
                actionBody = actionBody.replace("null", "\"\"");
                actionBody = actionBody.replace("\"", "\\\"");
                policyDataString.append("\"jsonBodyData\":\"" + actionBody + "\",");
            }
        } catch (Exception e) {
            LOGGER.error("Exception Occured while updating actionData" + e);
            throw (e);
        } finally {
            if (actionResult != null) {
                try {
                    actionResult.close();
                } catch (Exception e) {
                    LOGGER.error("Exception Occured while closing the ResultSet" + e);
                }
            }
            if (pstmt != null) {
                try {
                    pstmt.close();
                } catch (Exception e) {
                    LOGGER.error("Exception Occured while closing the PreparedStatement" + e);
                }
            }
        }
    }
}