/*
 * Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
 * license agreements.  See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.  Crate 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
 * under the License.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial agreement.
 */

package io.crate.types;

import io.crate.Streamer;
import io.crate.TimestampFormat;
import org.apache.lucene.util.BytesRef;

public class TimestampType extends LongType implements Streamer<Long>, DataTypeFactory {

    public static final TimestampType INSTANCE = new TimestampType();
    public static final int ID = 11;

    private TimestampType() {
    }

    @Override
    public int id() {
        return ID;
    }

    @Override
    public String getName() {
        return "timestamp";
    }

    @Override
    public Long value(Object value) throws ClassCastException {
        if (value == null) {
            return null;
        }
        if (value instanceof BytesRef) {
            return valueFromString(((BytesRef) value).utf8ToString());
        }
        if (value instanceof String) {
            return valueFromString((String) value);
        }
        // we treat float and double values as seconds with milliseconds as fractions
        // see timestamp documentation
        if (value instanceof Double) {
            return ((Number) (((Double) value) * 1000)).longValue();
        }
        if (value instanceof Float) {
            return ((Number) (((Float) value) * 1000)).longValue();
        }
        if (!(value instanceof Long)) {
            return ((Number) value).longValue();
        }
        return (Long) value;
    }

    private Long valueFromString(String s) {
        try {
            return Long.valueOf(s);
        } catch (NumberFormatException e) {
            return TimestampFormat.parseTimestampString(s);
        }
    }

    @Override
    public DataType<?> create() {
        return TimestampType.INSTANCE;
    }
}