/**
 * ============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.introspection;

import java.io.UnsupportedEncodingException;
import java.lang.reflect.InvocationTargetException;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;

import org.onap.aai.schema.enums.ObjectMetadata;
import org.onap.aai.schema.enums.PropertyMetadata;
import org.onap.aai.setup.SchemaVersion;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

public class JSONStrategy extends Introspector {

    private JsonNode json = null;
    private String namedType = "";
    private static final ObjectMapper mapper = new ObjectMapper();

    protected JSONStrategy(Object o) {
        super(o);
        json = mapper.valueToTree(o);
        // Assumes you provide a wrapper
        Iterator<Map.Entry<String, JsonNode>> fields = json.fields();
        if (fields.hasNext()) {
            Map.Entry<String, JsonNode> entry = fields.next();
            if (!fields.hasNext()) {
                namedType = entry.getKey();
                json = entry.getValue();
            } else {
                throw new IllegalArgumentException("This object has no named type.");
            }
        } else {
            throw new IllegalArgumentException("This object has no named type.");
        }
    }

    protected JSONStrategy(Object o, String namedType) {
        super(o);
        json = (JsonNode) o;
        this.namedType = namedType;

    }

    @Override
    public boolean hasProperty(String name) {
        // TODO
        return true;
    }

    @Override
    public Object getValue(String name) {
        Object result = "";
        result = json.get(name);

        return result;
    }

    @Override
    public void setValue(String name, Object obj) {
        ((ObjectNode) json).set(name, (JsonNode) obj);
    }

    @Override
    public Object getUnderlyingObject() {
        return this.json;
    }

    @Override
    public Set<String> getProperties() {
        Iterator<String> fieldNames = json.fieldNames();
        Set<String> properties = new HashSet<>();

        // Iterate through the iterator and add each element to the set
        while (fieldNames.hasNext()) {
            properties.add(fieldNames.next());
        }
        return properties;
    }

    @Override
    public Set<String> getRequiredProperties() {
        // unknowable

        return this.getProperties();
    }

    @Override
    public Set<String> getKeys() {
        // unknowable
        return this.getProperties();
    }

    @Override
    public Set<String> getAllKeys() {
        // unknowable
        return this.getProperties();
    }

    @Override
    public String getType(String name) {
        String result = "";
        Class<?> resultClass = this.getClass(name);
        if (resultClass != null) {
            result = resultClass.getName();
        }

        if (result.equals("org.json.simple.JSONArray")) {
            result = "java.util.List";
        }

        return result;
    }

    @Override
    public String getGenericType(String name) {
        String result = "";
        Class<?> resultClass = this.getGenericTypeClass(name);
        if (resultClass != null) {
            result = resultClass.getName();
        }
        return result;
    }

    @Override
    public String getJavaClassName() {
        return json.getClass().getName();
    }

    @Override
    public Class<?> getClass(String name) {
        Class<?> result = null;
        result = json.get(name).getClass();

        return result;
    }

    @Override
    public Class<?> getGenericTypeClass(String name) {
        Class<?> resultClass = null;
        Object resultObject = this.getValue(name);
        if (resultObject instanceof ArrayNode) {
            resultClass = ((List<?>) resultObject).get(0).getClass();
        }

        return resultClass;
    }

    @Override
    public Object newInstanceOfProperty(String name) {
        try {
            return this.getClass(name).getDeclaredConstructor().newInstance();
        } catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException
                | NoSuchMethodException | SecurityException e) {
            return null;
        }
    }

    @Override
    public Object newInstanceOfNestedProperty(String name) {
        try {
            return this.getGenericTypeClass(name).getDeclaredConstructor().newInstance();
        } catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException
                | NoSuchMethodException | SecurityException e) {
            return null;
        }
    }

    @Override
    public boolean isComplexType(String name) {
        String result = this.getType(name);
        return result.contains("JSONObject");
    }

    @Override
    public boolean isComplexGenericType(String name) {
        String result = this.getGenericType(name);
        return result.contains("JSONObject");
    }

    @Override
    public boolean isListType(String name) {
        String result = this.getType(name);
        return result.contains("java.util.List");
    }

    @Override
    public boolean isContainer() {
        Set<String> props = this.getProperties();
        return props.size() == 1 && this.isListType(props.iterator().next());
    }

    @Override
    protected String findKey() {
        return "";
    }

    @Override
    public String getName() {
        return this.namedType;
    }

    @Override
    public String getDbName() {
        return this.getName();
    }

    @Override
    public String getURI() {

        // use a UUID for now
        return UUID.randomUUID().toString();
    }

    @Override
    public String getGenericURI() {

        // there is none defined for this
        return "";
    }

    @Override
    public String preProcessKey(String key) {

        // don't do anything with it
        return key;

    }

    @Override
    public String marshal(MarshallerProperties properties) {
        // TODO
        return null;
    }

    /*
     * @Override
     * public String findEdgeName(String parent, String child) {
     *
     * // Always has for now
     * return "has";
     *
     * }
     */

    @Override
    public ModelType getModelType() {
        return ModelType.JSON;
    }

    @Override
    public Set<String> getIndexedProperties() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public String getChildName() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public boolean hasChild(Introspector child) {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean isSimpleType(String name) {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean isSimpleGenericType(String name) {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public Map<PropertyMetadata, String> getPropertyMetadata(String prop) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public String getMetadata(ObjectMetadata metadataName) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public String getChildDBName() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public String getFullGenericURI() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    protected Object get(String name) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    protected void set(String name, Object value) {
        // TODO Auto-generated method stub

    }

    @Override
    public String getObjectId() throws UnsupportedEncodingException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public SchemaVersion getVersion() {
        // TODO Auto-generated method stub
        return null;
    }

}