/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.
 */
package org.apache.atlas.repository.converters;

import org.apache.atlas.exception.AtlasBaseException;
import org.apache.atlas.model.TypeCategory;
import org.apache.atlas.model.typedef.AtlasEnumDef.AtlasEnumElementDef;
import org.apache.atlas.type.AtlasEnumType;
import org.apache.atlas.type.AtlasType;
import org.apache.atlas.type.AtlasTypeRegistry;
import org.apache.atlas.v1.model.typedef.EnumTypeDefinition.EnumValue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Map;

public class AtlasEnumFormatConverter extends AtlasAbstractFormatConverter {
    private static final Logger LOG = LoggerFactory.getLogger(AtlasEnumFormatConverter.class);

    public AtlasEnumFormatConverter(AtlasFormatConverters registry, AtlasTypeRegistry typeRegistry) {
        super(registry, typeRegistry, TypeCategory.ENUM);
    }

    @Override
    public boolean isValidValueV1(Object v1Obj, AtlasType type) {
        boolean ret = false;

        if (v1Obj == null) {
            ret = true;
        } else if (type instanceof AtlasEnumType) {
            final AtlasEnumType enumType = (AtlasEnumType) type;

            if (v1Obj instanceof EnumValue) {
                Object enumValue = ((EnumValue) v1Obj).getValue();

                if (enumValue != null) {
                    ret = enumType.getEnumDef().hasElement(enumValue.toString());
                }
            } else if (v1Obj instanceof Map) {
                Object enumValue = ((Map<?, ?>) v1Obj).get("value");

                if (enumValue != null) {
                    ret = enumType.getEnumDef().hasElement(enumValue.toString());
                } else {
                    Object enumOrdinal = ((Map<?, ?>) v1Obj).get("ordinal");

                    if (enumOrdinal != null) {
                        ret = enumType.getEnumElementDef((Number) enumOrdinal) != null;
                    }
                }
            } else if (v1Obj instanceof Number) {
                ret = enumType.getEnumElementDef((Number) v1Obj) != null;
            } else {
                ret = enumType.getEnumElementDef(v1Obj.toString()) != null;
            }
        }

        LOG.debug("AtlasEnumFormatConverter.isValidValueV1(type={}, value={}): {}", (v1Obj != null ? v1Obj.getClass().getCanonicalName() : null), v1Obj, ret);

        return ret;
    }

    @Override
    public Object fromV1ToV2(Object v1Obj, AtlasType type, ConverterContext ctx) throws AtlasBaseException {
        if (v1Obj == null || !(type instanceof AtlasEnumType)) {
            return null;
        }

        String ret     = null;
        Object v1Value = null;

        if (v1Obj instanceof EnumValue) {
            EnumValue enumValue = (EnumValue) v1Obj;

            v1Value = enumValue.getValue();

            if (v1Value == null) {
                v1Value = enumValue.getOrdinal();
            }
        } else if (v1Obj instanceof Map) {
            Map<?, ?> mapValue = (Map<?, ?>) v1Obj;

            v1Value = mapValue.get("value");

            if (v1Value == null) {
                v1Value = mapValue.get("ordinal");
            }
        }

        if (v1Value == null) { // could be 'value' or 'ordinal'
            v1Value = v1Obj;
        }

        AtlasEnumElementDef elementDef;

        if (v1Value instanceof Number) {
            elementDef = ((AtlasEnumType) type).getEnumElementDef((Number) v1Value);
        } else {
            elementDef = ((AtlasEnumType) type).getEnumElementDef(v1Value.toString());
        }

        if (elementDef != null) {
            ret = elementDef.getValue();
        }

        return ret;
    }

    @Override
    public Object fromV2ToV1(Object v2Obj, AtlasType type, ConverterContext ctx) {
        if (v2Obj == null || !(type instanceof AtlasEnumType)) {
            return null;
        }

        EnumValue           ret        = null;
        AtlasEnumType       enumType   = (AtlasEnumType) type;
        AtlasEnumElementDef elementDef = enumType.getEnumElementDef(v2Obj.toString());

        if (elementDef != null) {
            ret = new EnumValue(elementDef.getValue(), elementDef.getOrdinal());
        }

        return ret;
    }
}
