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/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.index.fielddata;

import org.apache.lucene.index.NumericDocValues;
import org.apache.lucene.search.DoubleValues;
import org.opensearch.common.annotation.PublicApi;

import java.io.IOException;

/**
 * A per-document numeric value.
 *
 * @opensearch.api
 */
@PublicApi(since = "1.0.0")
public abstract class NumericDoubleValues extends DoubleValues {

    /** Sole constructor. (For invocation by subclass
     * constructors, typically implicit.) */
    protected NumericDoubleValues() {}

    // TODO: this interaction with sort comparators is really ugly...
    /** Returns numeric docvalues view of raw double bits */
    public NumericDocValues getRawDoubleValues() {
        return new AbstractNumericDocValues() {
            private int docID = -1;

            @Override
            public boolean advanceExact(int target) throws IOException {
                docID = target;
                return NumericDoubleValues.this.advanceExact(target);
            }

            @Override
            public long longValue() throws IOException {
                return Double.doubleToRawLongBits(NumericDoubleValues.this.doubleValue());
            }

            @Override
            public int docID() {
                return docID;
            }

            @Override
            public int advance(int target) throws IOException {
                return NumericDoubleValues.this.advance(target);
            }
        };
    }

    // yes... this is doing what the previous code was doing...
    /** Returns numeric docvalues view of raw float bits */
    public NumericDocValues getRawFloatValues() {
        return new AbstractNumericDocValues() {
            private int docID = -1;

            @Override
            public boolean advanceExact(int target) throws IOException {
                docID = target;
                return NumericDoubleValues.this.advanceExact(target);
            }

            @Override
            public long longValue() throws IOException {
                return Float.floatToRawIntBits((float) NumericDoubleValues.this.doubleValue());
            }

            @Override
            public int docID() {
                return docID;
            }

            @Override
            public int advance(int target) throws IOException {
                return NumericDoubleValues.this.advance(target);
            }
        };
    }

    /**
     * Advances to the first beyond the current whose document number is greater than or equal to
     * target, and returns the document number itself. Exhausts the iterator and returns {@link
     * org.apache.lucene.search.DocIdSetIterator#NO_MORE_DOCS} if target is greater than the highest document number in the set.
     *
     * This method is being used by {@link org.apache.lucene.search.comparators.NumericComparator.NumericLeafComparator} when point values optimization kicks
     * in and is implemented by most numeric types.
     */
    public int advance(int target) throws IOException {
        throw new UnsupportedOperationException();
    }
}