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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.db;

import org.apache.cayenne.access.DataNode;
import org.apache.cayenne.dba.DbAdapter;
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.DbAttribute;
import org.apache.cayenne.map.DbEntity;
import org.apache.cayenne.validation.SimpleValidationFailure;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class CreateTableToDb extends AbstractToDbToken.Entity {

    public CreateTableToDb(DbEntity entity) {
        super("Create Table", 40, entity);
    }

    @Override
    public List<String> createSql(DbAdapter adapter) {
        List<String> sqls = new ArrayList<>();
        if(needAutoPkSupport()) {
            sqls.addAll(adapter.getPkGenerator().createAutoPkStatements(
                    Collections.singletonList(getEntity())));
        }
        sqls.add(adapter.createTable(getEntity()));
        return sqls;
    }

    @Override
    public void execute(MergerContext mergerContext) {
        try {
            DataNode node = mergerContext.getDataNode();
            DbAdapter adapter = node.getAdapter();
            if(needAutoPkSupport()) {
                adapter.getPkGenerator().createAutoPk(
                        node,
                        Collections.singletonList(getEntity()));
            }
            executeSql(mergerContext, adapter.createTable(getEntity()));
        }
        catch (Exception e) {
            mergerContext.getValidationResult().addFailure(
                    new SimpleValidationFailure(this, e.getMessage()));
        }
    }

    private boolean needAutoPkSupport() {
        DbEntity entity = getEntity();
        if(entity.getPrimaryKeyGenerator() != null) {
            return false;
        }

        for(DbAttribute attribute : entity.getPrimaryKeys()) {
            if(attribute.isGenerated()) {
                return false;
            }
        }

        return true;
    }

    public MergerToken createReverse(MergerTokenFactory factory) {
        return factory.createDropTableToModel(getEntity());
    }

}