/**
 * ============LICENSE_START=======================================================
 * org.onap.aai
 * ================================================================================
 * Copyright © 2017-2018 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.aai.util;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.json.JsonMapper;
import com.fasterxml.jackson.module.jaxb.JaxbAnnotationModule;
import com.google.common.base.CaseFormat;
import com.google.common.collect.Multimap;

import java.io.IOException;
import java.io.StringWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.nio.charset.Charset;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Random;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;

import org.apache.commons.io.output.ByteArrayOutputStream;
import org.eclipse.persistence.dynamic.DynamicEntity;
import org.eclipse.persistence.jaxb.JAXBMarshaller;
import org.eclipse.persistence.jaxb.MarshallerProperties;
import org.onap.aai.domain.model.AAIResource;
import org.onap.aai.exceptions.AAIException;

public class PojoUtils {

    /**
     * Gets the key value list.
     *
     * @param <T> the generic type
     * @param e the e
     * @param clazz the clazz
     * @return the key value list
     * @throws IllegalAccessException the illegal access exception
     * @throws IllegalArgumentException the illegal argument exception
     * @throws InvocationTargetException the invocation target exception
     */
    public <T> List<KeyValueList> getKeyValueList(Entity e, T clazz)
            throws IllegalAccessException, IllegalArgumentException, InvocationTargetException {
        List<KeyValueList> kvList = e.getKeyValueList();
        Object value = null;
        Method[] methods = clazz.getClass().getDeclaredMethods();
        String propertyName = "";

        for (Method method : methods) {
            if (method.getName().startsWith("get")) {
                propertyName = CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_HYPHEN, method.getName().substring(3));
                if (!(method.getReturnType().getName().contains("aai"))
                        || method.getReturnType().getName().contains("java.util.List")) {
                    value = method.invoke(clazz);
                    KeyValueList kv = new KeyValueList();
                    kv.setKey(propertyName);
                    if (value != null) {
                        kv.setValue(value.toString());
                    } else {
                        kv.setValue("");
                    }
                    kvList.add(kv);
                }
            }
        }
        return kvList;
    }

    /**
     * Gets the json from object.
     *
     * @param <T> the generic type
     * @param clazz the clazz
     * @return the json from object
     * @throws JsonGenerationException the json generation exception
     * @throws JsonMappingException the json mapping exception
     * @throws IOException Signals that an I/O exception has occurred.
     */
    public <T> String getJsonFromObject(T clazz) throws JsonGenerationException, JsonMappingException, IOException {
        return getJsonFromObject(clazz, false, true);
    }

    /**
     * Gets the json from object.
     *
     * @param <T> the generic type
     * @param clazz the clazz
     * @param wrapRoot the wrap root
     * @param indent the indent
     * @return the json from object
     * @throws JsonGenerationException the json generation exception
     * @throws JsonMappingException the json mapping exception
     * @throws IOException Signals that an I/O exception has occurred.
     */
    public <T> String getJsonFromObject(T clazz, boolean wrapRoot, boolean indent)
            throws JsonGenerationException, JsonMappingException, IOException {
        ObjectMapper mapper = JsonMapper.builder().serializationInclusion(JsonInclude.Include.NON_NULL)
                .configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false)
                .configure(SerializationFeature.INDENT_OUTPUT, indent)
                .configure(SerializationFeature.WRAP_ROOT_VALUE, wrapRoot)
                .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
                .configure(DeserializationFeature.UNWRAP_ROOT_VALUE, wrapRoot).addModule(new JaxbAnnotationModule())
                .build();

        return mapper.writeValueAsString(clazz);
    }

    /**
     * Gets the json from dynamic object.
     *
     * @param ent the ent
     * @param jaxbContext the jaxb context
     * @param includeRoot the include root
     * @return the json from dynamic object
     * @throws JsonGenerationException the json generation exception
     * @throws JsonMappingException the json mapping exception
     * @throws IOException Signals that an I/O exception has occurred.
     * @throws JAXBException the JAXB exception
     */
    public String getJsonFromDynamicObject(DynamicEntity ent, org.eclipse.persistence.jaxb.JAXBContext jaxbContext,
            boolean includeRoot) throws JsonGenerationException, JsonMappingException, IOException, JAXBException {
        JAXBMarshaller marshaller = jaxbContext.createMarshaller();

        marshaller.setProperty(JAXBMarshaller.JAXB_FORMATTED_OUTPUT, false);
        marshaller.setProperty(MarshallerProperties.JSON_MARSHAL_EMPTY_COLLECTIONS, Boolean.FALSE);
        marshaller.setProperty("eclipselink.json.include-root", includeRoot);
        marshaller.setProperty("eclipselink.media-type", "application/json");
        StringWriter writer = new StringWriter();
        marshaller.marshal(ent, writer);

        return writer.toString();
    }

    /**
     * Gets the xml from object.
     *
     * @param <T> the generic type
     * @param clazz the clazz
     * @return the xml from object
     * @throws JAXBException the JAXB exception
     * @throws IOException
     */
    public <T> String getXmlFromObject(T clazz) throws JAXBException, IOException {
        try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
            JAXBContext jc = JAXBContext.newInstance(clazz.getClass().getPackage().getName());

            Marshaller marshaller = jc.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            marshaller.marshal(clazz, baos);

            return baos.toString(Charset.defaultCharset());
        }
    }

    /**
     * Gets the lookup key.
     *
     * @param baseKey the base key
     * @param lookupHash the lookup hash
     * @param keyProps the key props
     * @return the lookup key
     */
    public String getLookupKey(String baseKey, HashMap<String, Object> lookupHash, Collection<String> keyProps) {
        int baseKeyLen = baseKey.length();
        StringBuffer newKey = new StringBuffer();
        if (baseKeyLen > 0) {
            newKey.append(baseKey);
        }

        Iterator<String> keyPropI = keyProps.iterator();
        while (keyPropI.hasNext()) {
            String keyProp = keyPropI.next();
            if (baseKeyLen > 0) {
                newKey.append("&");
            }
            newKey.append(keyProp + "=" + lookupHash.get(keyProp));
        }
        return newKey.toString();
    }

    /**
     * Gets the lookup keys.
     *
     * @param lookupHashes the lookup hashes
     * @param _dbRulesNodeKeyProps the db rules node key props
     * @return the lookup keys
     */
    public String getLookupKeys(LinkedHashMap<String, HashMap<String, Object>> lookupHashes,
            Multimap<String, String> _dbRulesNodeKeyProps) {
        Iterator<String> it = lookupHashes.keySet().iterator();
        String lookupKeys = "";
        while (it.hasNext()) {
            String objectType = (String) it.next();
            HashMap<String, Object> lookupHash = lookupHashes.get(objectType);

            Collection<String> keyProps = _dbRulesNodeKeyProps.get(objectType);
            Iterator<String> keyPropI = keyProps.iterator();
            while (keyPropI.hasNext()) {
                lookupKeys += lookupHash.get(keyPropI.next());
            }
        }
        return lookupKeys;
    }

    /**
     * Gets the example object.
     *
     * @param <T> the generic type
     * @param clazz the clazz
     * @param singleton the singleton
     * @return the example object
     * @throws IllegalAccessException the illegal access exception
     * @throws IllegalArgumentException the illegal argument exception
     * @throws InvocationTargetException the invocation target exception
     * @throws NoSuchMethodException the no such method exception
     * @throws SecurityException the security exception
     * @throws AAIException the AAI exception
     */
    public <T> void getExampleObject(T clazz, boolean singleton)
            throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException,
            SecurityException, AAIException {
        Method[] methods = clazz.getClass().getDeclaredMethods();
        String dnHypPropertyName = "";
        String upCamPropertyName = "";
        Random rand = new SecureRandom();
        int randInt = rand.nextInt(10000000);

        for (Method method : methods) {
            boolean go = false;
            if (method.getName().startsWith("get")) {
                dnHypPropertyName = CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_HYPHEN, method.getName().substring(3));
                upCamPropertyName = CaseFormat.UPPER_CAMEL.to(CaseFormat.UPPER_CAMEL, method.getName().substring(3));
                go = true;
            } else if (method.getName().startsWith("is")) {
                dnHypPropertyName = CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_HYPHEN, method.getName().substring(2));
                upCamPropertyName = CaseFormat.UPPER_CAMEL.to(CaseFormat.UPPER_CAMEL, method.getName().substring(2));
                go = true;
            }
            // don't return resource-version on a singleton
            if (singleton && dnHypPropertyName.equals("resource-version")) {
                go = false;
            }
            if (go) {
                String retType = method.getReturnType().getName();
                if (!retType.contains("aai") && !retType.contains("java.util.List")) {
                    // get the setter
                    Method meth = clazz.getClass().getMethod("set" + upCamPropertyName, method.getReturnType());

                    if (retType.contains("String")) {
                        String val = "example-" + dnHypPropertyName + "-val-" + randInt;
                        if (val != null) {
                            meth.invoke(clazz, val);
                        }
                    } else if (retType.toLowerCase().contains("long")) {
                        Integer foo = rand.nextInt(100000);
                        meth.invoke(clazz, foo.longValue());
                    } else if (retType.toLowerCase().contains("int")) {
                        meth.invoke(clazz, rand.nextInt(100000));
                    } else if (retType.toLowerCase().contains("short")) {
                        Integer randShort = rand.nextInt(10000);
                        meth.invoke(clazz, randShort.shortValue());
                    } else if (retType.toLowerCase().contains("boolean")) {
                        meth.invoke(clazz, true);
                    }
                    // i think max has a list in license-management
                }
            }
        }
    }

    /**
     * Gets the dynamic example object.
     *
     * @param childObject the child object
     * @param aaiRes the aai res
     * @param singleton the singleton
     * @return the dynamic example object
     */
    public void getDynamicExampleObject(DynamicEntity childObject, AAIResource aaiRes, boolean singleton) {
        // TODO Auto-generated method stub

        Random rand = new SecureRandom();
        Integer randInt = rand.nextInt(100000);
        long range = 100000000L;
        long randLong = (long) (rand.nextDouble() * range);
        Integer randShrt = rand.nextInt(20000);
        short randShort = randShrt.shortValue();

        for (String dnHypAttrName : aaiRes.getStringFields()) {

            if (singleton && ("resource-version").equals(dnHypAttrName)) {
                continue;
            }

            String dnCamAttrName = CaseFormat.LOWER_HYPHEN.to(CaseFormat.LOWER_CAMEL, dnHypAttrName);
            childObject.set(dnCamAttrName, "example-" + dnHypAttrName + "-val-" + randInt);

        }

        for (String dnHypAttrName : aaiRes.getStringListFields()) {
            ArrayList<String> exampleList = new ArrayList<String>();
            exampleList.add("example-" + dnHypAttrName + "-val-" + randInt + "-" + 1);
            exampleList.add("example-" + dnHypAttrName + "-val-" + randInt + "-" + 2);
            String dnCamAttrName = CaseFormat.LOWER_HYPHEN.to(CaseFormat.LOWER_CAMEL, dnHypAttrName);
            childObject.set(dnCamAttrName, exampleList);
        }

        // the attrName might need to be converted to camel case!!!
        for (String dnHypAttrName : aaiRes.getLongFields()) {
            String dnCamAttrName = CaseFormat.LOWER_HYPHEN.to(CaseFormat.LOWER_CAMEL, dnHypAttrName);
            childObject.set(dnCamAttrName, randLong);
        }

        for (String dnHypAttrName : aaiRes.getIntFields()) {
            String dnCamAttrName = CaseFormat.LOWER_HYPHEN.to(CaseFormat.LOWER_CAMEL, dnHypAttrName);
            childObject.set(dnCamAttrName, randInt);
        }

        for (String dnHypAttrName : aaiRes.getShortFields()) {
            String dnCamAttrName = CaseFormat.LOWER_HYPHEN.to(CaseFormat.LOWER_CAMEL, dnHypAttrName);
            childObject.set(dnCamAttrName, randShort);
        }

        for (String dnHypAttrName : aaiRes.getBooleanFields()) {
            String dnCamAttrName = CaseFormat.LOWER_HYPHEN.to(CaseFormat.LOWER_CAMEL, dnHypAttrName);
            childObject.set(dnCamAttrName, Boolean.TRUE);
        }
    }
}