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/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2017 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.openecomp.sdc.be.tosca;

import java.io.StringReader;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.openecomp.sdc.be.datatypes.elements.SchemaDefinition;
import org.openecomp.sdc.be.model.Component;
import org.openecomp.sdc.be.model.DataTypeDefinition;
import org.openecomp.sdc.be.model.PropertyDefinition;
import org.openecomp.sdc.be.model.Resource;
import org.openecomp.sdc.be.model.tosca.ToscaPropertyType;
import org.openecomp.sdc.be.model.tosca.converters.DataTypePropertyConverter;
import org.openecomp.sdc.be.model.tosca.converters.ToscaMapValueConverter;
import org.openecomp.sdc.be.model.tosca.converters.ToscaValueConverter;
import org.openecomp.sdc.be.tosca.model.EntrySchema;
import org.openecomp.sdc.be.tosca.model.ToscaNodeType;
import org.openecomp.sdc.be.tosca.model.ToscaProperty;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import com.google.gson.stream.JsonReader;

import fj.data.Either;

public class PropertyConvertor {
    private static PropertyConvertor instance;
    private JsonParser jsonParser = new JsonParser();
    private static final Logger log = LoggerFactory.getLogger(PropertyConvertor.class);
    Gson gson = new Gson();
    protected PropertyConvertor() {

    }

    public static synchronized PropertyConvertor getInstance() {
        if (instance == null) {
            instance = new PropertyConvertor();
        }
        return instance;
    }

    public Either<ToscaNodeType, ToscaError> convertProperties(Component component, ToscaNodeType toscaNodeType, Map<String, DataTypeDefinition> dataTypes) {

        if (component instanceof Resource) {
            Resource resource = (Resource) component;
            List<PropertyDefinition> props = resource.getProperties();
            if (props != null) {
                Map<String, ToscaProperty> properties = new HashMap<>();

                // take only the properties of this resource
                props.stream().filter(p -> p.getOwnerId() == null || p.getOwnerId().equals(component.getUniqueId())).forEach(property -> {
                    properties.put(property.getName(), convertProperty(dataTypes, property, false));
                 });
                if (!properties.isEmpty()) {
                    toscaNodeType.setProperties(properties);
                }
            }
        }
        return Either.left(toscaNodeType);
    }

    public ToscaProperty convertProperty(Map<String, DataTypeDefinition> dataTypes, PropertyDefinition property, boolean isCapabiltyProperty) {
        ToscaProperty prop = new ToscaProperty();

        String innerType = null;
        SchemaDefinition schema = property.getSchema();
        if (schema != null && schema.getProperty() != null && schema.getProperty().getType() != null && !schema.getProperty().getType().isEmpty()) {
            innerType = schema.getProperty().getType();
            EntrySchema eschema = new EntrySchema();
            eschema.setType(innerType);
            eschema.setDescription(schema.getProperty().getDescription());
            prop.setEntry_schema(eschema);
        }
        log.trace("try to convert property {} from type {} with default value [{}]", property.getName(), property.getType(), property.getDefaultValue());
        Object convertedObj = convertToToscaObject(property.getType(), property.getDefaultValue(), innerType, dataTypes);
        if (convertedObj != null) {
            prop.setDefaultp(convertedObj);
        }
        prop.setType(property.getType());
        prop.setDescription(property.getDescription());
        if (isCapabiltyProperty) {
            prop.setStatus(property.getStatus());
            prop.setRequired(property.isRequired());
        }
        return prop;

    }

    public Object convertToToscaObject(String propertyType, String value, String innerType, Map<String, DataTypeDefinition> dataTypes) {
        log.trace("try to convert propertyType {} , value [{}], innerType {}", propertyType, value, innerType);
        if (StringUtils.isEmpty(value)) {
            value = DataTypePropertyConverter.getInstance().getDataTypePropertiesDefaultValuesRec(propertyType, dataTypes);
            if(StringUtils.isEmpty(value)){
                return null;
            }
        }
        try {
            ToscaMapValueConverter mapConverterInst = ToscaMapValueConverter.getInstance();
            ToscaValueConverter innerConverter = null;
            Boolean isScalar = true;

            ToscaPropertyType type = ToscaPropertyType.isValidType(propertyType);
            if (type == null) {
                log.trace("isn't prederfined type, get from all data types");
                DataTypeDefinition dataTypeDefinition = dataTypes.get(propertyType);
                if (innerType == null) {
                    innerType = propertyType;
                }

                if ((type = mapConverterInst.isScalarType(dataTypeDefinition)) != null) {
                    log.trace("This is scalar type. get suitable converter for type {}", type);
                    innerConverter = type.getValueConverter();
                } else {
                    isScalar = false;
                }
            } else {
                ToscaPropertyType typeIfScalar = ToscaPropertyType.getTypeIfScalar(type.getType());
                if (typeIfScalar == null) {
                    isScalar = false;
                }

                innerConverter = type.getValueConverter();
                if (ToscaPropertyType.STRING.equals(type) && valueStartsWithNonJsonChar(value)) {
                    return innerConverter.convertToToscaValue(value, innerType, dataTypes);
                }
            }
            JsonElement jsonElement = null;

            StringReader reader = new StringReader(value);
            JsonReader jsonReader = new JsonReader(reader);
            jsonReader.setLenient(true);

            jsonElement = jsonParser.parse(jsonReader);

            if (value.equals("")) {
                return value;
            }

            if (jsonElement.isJsonPrimitive() && isScalar) {
                log.trace("It's well defined type. convert it");
                ToscaValueConverter converter = type.getValueConverter();
                return converter.convertToToscaValue(value, innerType, dataTypes);
            } else {
                log.trace("It's data type or inputs in primitive type. convert as map");
                Object convertedValue;
                if (innerConverter != null && (ToscaPropertyType.MAP.equals(type) || ToscaPropertyType.LIST.equals(type))) {
                    convertedValue = innerConverter.convertToToscaValue(value, innerType, dataTypes);
                } else {
                    if (isScalar) {
                        // complex json for scalar type
                        convertedValue = mapConverterInst.handleComplexJsonValue(jsonElement);
                    } else {
                        if (innerConverter != null) {
                            convertedValue = innerConverter.convertToToscaValue(value, innerType, dataTypes);
                        } else {
                            convertedValue = mapConverterInst.convertDataTypeToToscaObject(innerType, dataTypes, innerConverter, isScalar, jsonElement);
                        }
                    }
                }
                return convertedValue;
            }

        } catch (Exception e) {
            log.debug("convertToToscaValue failed to parse json value :", e);
            return null;
        }

    }

    private boolean valueStartsWithNonJsonChar(String value) {
        return value.startsWith("/") || value.startsWith(":");
    }

}