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/**
 * Copyright (c) 2009-2016, Data Geekery GmbH (http://www.datageekery.com)
 * All rights reserved.
 *
 * 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.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
 * database integrations.
 *
 * For more information, please visit: http://www.jooq.org/licenses
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package org.jooq.impl;

import static org.jooq.impl.DSL.field;
import static org.jooq.impl.DSL.function;

import java.sql.Timestamp;

import org.jooq.Configuration;
import org.jooq.DatePart;
import org.jooq.Field;
import org.jooq.exception.SQLDialectNotSupportedException;

/**
 * @author Lukas Eder
 */
final class Extract extends AbstractFunction {

    private static final long serialVersionUID = 3748640920856031034L;

    private final Field    field;
    private final DatePart    datePart;

    Extract(Field field, DatePart datePart) {
        super("extract", SQLDataType.INTEGER, field);

        this.field = field;
        this.datePart = datePart;
    }

    @Override
    final Field getFunction0(Configuration configuration) {
        switch (configuration.family()) {
            case SQLITE:
                switch (datePart) {
                    case YEAR:
                        return field("{strftime}('%Y', {0})", SQLDataType.INTEGER, field);
                    case MONTH:
                        return field("{strftime}('%m', {0})", SQLDataType.INTEGER, field);
                    case DAY:
                        return field("{strftime}('%d', {0})", SQLDataType.INTEGER, field);
                    case HOUR:
                        return field("{strftime}('%H', {0})", SQLDataType.INTEGER, field);
                    case MINUTE:
                        return field("{strftime}('%M', {0})", SQLDataType.INTEGER, field);
                    case SECOND:
                        return field("{strftime}('%S', {0})", SQLDataType.INTEGER, field);
                    default:
                        throw new SQLDialectNotSupportedException("DatePart not supported: " + datePart);
                }






















            case DERBY:
                switch (datePart) {
                    case YEAR:
                        return function("year", SQLDataType.INTEGER, field);
                    case MONTH:
                        return function("month", SQLDataType.INTEGER, field);
                    case DAY:
                        return function("day", SQLDataType.INTEGER, field);
                    case HOUR:
                        return function("hour", SQLDataType.INTEGER, field);
                    case MINUTE:
                        return function("minute", SQLDataType.INTEGER, field);
                    case SECOND:
                        return function("second", SQLDataType.INTEGER, field);
                    default:
                        throw new SQLDialectNotSupportedException("DatePart not supported: " + datePart);
                }





























































            case MARIADB:
            case MYSQL:
            case POSTGRES:
            case HSQLDB:
            case H2:

            // A default implementation is necessary for hashCode() and toString()
            default:
                return field("{extract}({" + datePart.toSQL() + " from} {0})", SQLDataType.INTEGER, field);
        }
    }
}