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 *  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
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 *    http://www.apache.org/licenses/LICENSE-2.0
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 *  Unless required by applicable law or agreed to in writing,
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 *  "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.reverse.dbload;

import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.apache.cayenne.dba.DbAdapter;
import org.apache.cayenne.dbsync.reverse.filters.CatalogFilter;
import org.apache.cayenne.dbsync.reverse.filters.SchemaFilter;
import org.apache.cayenne.map.DbEntity;
import org.apache.cayenne.map.DetectedDbEntity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

class EntityLoader extends PerCatalogAndSchemaLoader {

    private static final Logger LOGGER = LoggerFactory.getLogger(DbLoader.class);

    private final String[] types;

    EntityLoader(DbAdapter adapter, DbLoaderConfiguration config, DbLoaderDelegate delegate) {
        super(adapter, config, delegate);
        types = getTableTypes();
    }

    @Override
    protected ResultSet getResultSet(String catalogName, String schemaName, DatabaseMetaData metaData) throws SQLException {
        return metaData.getTables(catalogName, schemaName, WILDCARD, types);
    }

    @Override
    protected void processResultSetRow(CatalogFilter catalog, SchemaFilter schema, DbLoadDataStore map, ResultSet rs) throws SQLException {
        String name = rs.getString("TABLE_NAME");
        String catalogName = rs.getString("TABLE_CAT");
        String schemaName = rs.getString("TABLE_SCHEM");
        String type = rs.getString("TABLE_TYPE");

        // Oracle 9i and newer has a nifty recycle bin feature...
        // but we don't want dropped tables to be included here;
        // in fact they may even result in errors on reverse engineering
        // as their names have special chars like "/", etc.
        // So skip them all together (it's about "name == null" check)
        if (name == null || !schema.tables.isIncludeTable(name)) {
            return;
        }

        if (!(catalog.name == null || catalog.name.equals(catalogName))
                || !(schema.name == null || schema.name.equals(schemaName))) {
            LOGGER.error(catalogName + "." + schema + "." + schemaName + " wrongly loaded for catalog/schema : "
                    + catalog.name + "." + schema.name);
            return;
        }

        DetectedDbEntity table = new DetectedDbEntity(name);
        table.setCatalog(catalogName);
        table.setSchema(schemaName);
        table.setType(type);
        addDbEntityToMap(table, map);
    }

    private void addDbEntityToMap(DetectedDbEntity table, DbLoadDataStore map) {
        DbEntity oldEnt = map.addDbEntitySafe(table);
        if (oldEnt != null) {
            LOGGER.debug("Overwrite DbEntity: " + oldEnt.getName());
            delegate.dbEntityRemoved(oldEnt);
        }
        delegate.dbEntityAdded(table);
    }

    private String[] getTableTypes() {
        String[] configTypes = config.getTableTypes();
        if (configTypes != null && configTypes.length > 0) {
            return configTypes;
        }

        List<String> list = new ArrayList<>(2);
        String viewType = adapter.tableTypeForView();
        if (viewType != null) {
            list.add(viewType);
        }
        String tableType = adapter.tableTypeForTable();
        if (tableType != null) {
            list.add(tableType);
        }
        return list.toArray(new String[0]);
    }
}