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/**
 * Copyright (c) 2009-2014, Data Geekery GmbH (http://www.datageekery.com)
 * All rights reserved.
 *
 * This work is dual-licensed
 * - under the Apache Software License 2.0 (the "ASL")
 * - under the jOOQ License and Maintenance Agreement (the "jOOQ License")
 * =============================================================================
 * You may choose which license applies to you:
 *
 * - If you're using this work with Open Source databases, you may choose
 *   either ASL or jOOQ License.
 * - If you're using this work with at least one commercial database, you must
 *   choose jOOQ License
 *
 * For more information, please visit http://www.jooq.org/licenses
 *
 * Apache Software License 2.0:
 * -----------------------------------------------------------------------------
 * 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.
 *
 * jOOQ License and Maintenance Agreement:
 * -----------------------------------------------------------------------------
 * Data Geekery grants the Customer the non-exclusive, timely limited and
 * non-transferable license to install and use the Software under the terms of
 * the jOOQ License and Maintenance Agreement.
 *
 * This library is distributed with a LIMITED WARRANTY. See the jOOQ License
 * and Maintenance Agreement for more details: http://www.jooq.org/licensing
 */

package org.jooq.util;

import static org.jooq.util.AbstractDatabase.fetchedSize;
import static org.jooq.util.AbstractDatabase.filterExcludeInclude;
import static org.jooq.util.AbstractDatabase.getDefinition;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.jooq.tools.JooqLogger;
import org.jooq.tools.StringUtils;

/**
 * A base implementation for element container definitions
 *
 * @author Lukas Eder
 */
public abstract class AbstractElementContainerDefinition>
extends AbstractDefinition {

    /**
     * Precision and scale for those dialects that don't formally provide that
     * information in a separate field
     */
    protected static final Pattern  PRECISION_SCALE = Pattern.compile("\\((\\d+)\\s*(?:,\\s*(\\d+))?\\)");
    private static final JooqLogger log             = JooqLogger.getLogger(AbstractElementContainerDefinition.class);

    private List                 elements;

    public AbstractElementContainerDefinition(SchemaDefinition schema, String name, String comment) {
        super(schema.getDatabase(), schema, name, comment);
    }

    @Override
    public final List getDefinitionPath() {
        return Arrays.asList(getSchema(), this);
    }

    protected final List getElements() {
        if (elements == null) {
            elements = new ArrayList();

            try {
                Database db = getDatabase();
                List e = getElements0();

                // [#2603] Filter exclude / include also for table columns
                if (this instanceof TableDefinition && db.getIncludeExcludeColumns()) {
                    elements = filterExcludeInclude(e, db.getExcludes(), db.getIncludes(), db.getFilters());
                    log.info("Columns fetched", fetchedSize(e, elements));
                }
                else {
                    elements = e;
                }
            }
            catch (SQLException e) {
                log.error("Error while initialising type", e);
            }
        }

        return elements;
    }

    protected final E getElement(String name) {
        return getElement(name, false);
    }

    protected final E getElement(String name, boolean ignoreCase) {
        return getDefinition(getElements(), name, ignoreCase);
    }

    protected final E getElement(int index) {
        return getElements().get(index);
    }

    protected abstract List getElements0() throws SQLException;

    protected Number parsePrecision(String typeName) {
        if (typeName.contains("(")) {
            Matcher m = PRECISION_SCALE.matcher(typeName);

            if (m.find()) {
                if (!StringUtils.isBlank(m.group(1))) {
                    return Integer.valueOf(m.group(1));
                }
            }
        }

        return 0;
    }

    protected Number parseScale(String typeName) {
        if (typeName.contains("(")) {
            Matcher m = PRECISION_SCALE.matcher(typeName);

            if (m.find()) {
                if (!StringUtils.isBlank(m.group(2))) {
                    return Integer.valueOf(m.group(2));
                }
            }
        }

        return 0;
    }

    protected String parseTypeName(String typeName) {
        return typeName.replace(" NOT NULL", "");
    }

    protected boolean parseNotNull(String typeName) {
        return typeName.toUpperCase().contains("NOT NULL");
    }
}