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/*
 * Copyright 2024 Hazelcast Inc.
 *
 * Licensed under the Hazelcast Community License (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://hazelcast.com/hazelcast-community-license
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hazelcast.sql.impl.expression.datetime;

import com.hazelcast.jet.sql.impl.JetSqlSerializerHook;
import com.hazelcast.sql.impl.expression.Expression;
import com.hazelcast.sql.impl.expression.ExpressionEvalContext;
import com.hazelcast.sql.impl.expression.UniExpression;
import com.hazelcast.sql.impl.row.Row;
import com.hazelcast.sql.impl.type.QueryDataType;

import java.time.OffsetDateTime;

public final class ToEpochMillisFunction extends UniExpression {
    public ToEpochMillisFunction() { }

    private ToEpochMillisFunction(Expression operand) {
        super(operand);
    }

    public static ToEpochMillisFunction create(Expression operand) {
        return new ToEpochMillisFunction(operand);
    }

    @Override
    public int getClassId() {
        return JetSqlSerializerHook.EXPRESSION_TO_EPOCH_MILLIS;
    }

    @Override
    public Long eval(final Row row, final ExpressionEvalContext context) {
        final OffsetDateTime dateTime = (OffsetDateTime) this.operand.eval(row, context);
        if (dateTime == null) {
            return null;
        }

        return dateTime.toInstant().toEpochMilli();
    }

    @Override
    public QueryDataType getType() {
        return QueryDataType.BIGINT;
    }
}