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 *   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
 *
 *    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
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package org.apache.cayenne.dbsync.merge.token.model;

import org.apache.cayenne.dbsync.merge.context.MergerContext;
import org.apache.cayenne.dbsync.merge.factory.MergerTokenFactory;
import org.apache.cayenne.dbsync.merge.token.MergerToken;
import org.apache.cayenne.map.DbEntity;
import org.apache.cayenne.map.DbJoin;
import org.apache.cayenne.map.DbRelationship;
import org.apache.cayenne.map.ObjEntity;

public class AddRelationshipToModel extends AbstractToModelToken.Entity {

    public static final String COMMA_SEPARATOR = ", ";
    public static final int COMMA_SEPARATOR_LENGTH = COMMA_SEPARATOR.length();

    private DbRelationship relationship;

    public AddRelationshipToModel(DbEntity entity, DbRelationship relationship) {
        super("Add Relationship", 125, entity);
        this.relationship = relationship;
    }

    public static String getTokenValue(DbRelationship rel) {
        String attributes = "";
        if (rel.getJoins().size() == 1) {
            attributes = rel.getJoins().get(0).getTargetName();
        } else {
            for (DbJoin dbJoin : rel.getJoins()) {
                attributes += dbJoin.getTargetName() + COMMA_SEPARATOR;
            }

            if(attributes.isEmpty()) {
                attributes = "{}";
            } else {
                attributes = "{" + attributes.substring(0, attributes.length() - COMMA_SEPARATOR_LENGTH) + "}";
            }
        }

        return rel.getName() + " " + rel.getSourceEntity().getName() + "->" + rel.getTargetEntityName() + "." + attributes;
    }

    @Override
    public MergerToken createReverse(MergerTokenFactory factory) {
        return factory.createDropRelationshipToDb(getEntity(), relationship);
    }

    @Override
    public void execute(MergerContext context) {
        // Set name to relationship if it was created without it, e.g. in createReverse() action
        if(relationship.getName() == null) {
            relationship.setName(context.getNameGenerator().relationshipName(relationship));
        }

        getEntity().addRelationship(relationship);
        for (ObjEntity e : getMappedObjEntities()) {
            context.getEntityMergeSupport().synchronizeOnDbRelationshipAdded(e, relationship);
        }

        context.getDelegate().dbRelationshipAdded(relationship);
    }

    @Override
    public String getTokenValue() {
        return getTokenValue(relationship);
    }
}