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/*-
 * ========================LICENSE_START=================================
 * UniversalDB
 * ---
 * Copyright (C) 2014 - 2024 TeamApps.org
 * ---
 * 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.
 * =========================LICENSE_END==================================
 */
package org.teamapps.universaldb.index.binary;

import org.teamapps.universaldb.context.UserContext;
import org.teamapps.universaldb.index.AbstractIndex;
import org.teamapps.universaldb.index.IndexType;
import org.teamapps.universaldb.index.SortEntry;
import org.teamapps.universaldb.index.TableIndex;
import org.teamapps.universaldb.index.buffer.common.BlockEntryAtomicStore;
import org.teamapps.universaldb.model.FieldModel;
import org.teamapps.universaldb.util.DataStreamUtil;

import java.io.*;
import java.util.BitSet;
import java.util.List;
import java.util.function.Supplier;

public class BinaryIndex extends AbstractIndex {

	private BlockEntryAtomicStore atomicStore;

	public BinaryIndex(FieldModel fieldModel, TableIndex tableIndex) {
		super(fieldModel, tableIndex);
		atomicStore = new BlockEntryAtomicStore(tableIndex.getDataPath(), fieldModel.getName());
	}

	@Override
	public IndexType getType() {
		return IndexType.BINARY;
	}

	@Override
	public byte[] getGenericValue(int id) {
		return getValue(id);
	}

	@Override
	public boolean isEmpty(int id) {
		return getValue(id) == null;
	}

	@Override
	public void setGenericValue(int id, byte[] value) {
		setValue(id, value);
	}

	@Override
	public void removeValue(int id) {
		setValue(id, null);
	}

	public int getLength(int id) {
		return atomicStore.getBlockLength(id);
	}

	public Supplier getInputStreamSupplier(int id) {
		return () -> {
			byte[] value = getValue(id);
			if (value == null) {
				return null;
			} else {
				return new ByteArrayInputStream(value);
			}
		};
	}

	public byte[] getValue(int id) {
		return atomicStore.getBytes(id);
	}

	public void setValue(int id, byte[] value) {
		atomicStore.setBytes(id, value);
	}

	@Override
	public List sortRecords(List sortEntries, boolean ascending, UserContext userContext) {
		return sortEntries;
	}

	@Override
	public void dumpIndex(DataOutputStream dataOutputStream, BitSet records) throws IOException {
		for (int id = records.nextSetBit(0); id >= 0; id = records.nextSetBit(id + 1)) {
			byte[] value = getValue(id);
			dataOutputStream.writeInt(id);
			DataStreamUtil.writeByteArrayWithLengthHeader(dataOutputStream, value);
		}
	}

	@Override
	public void restoreIndex(DataInputStream dataInputStream) throws IOException {
		try {
			int id = dataInputStream.readInt();
			byte[] value = DataStreamUtil.readByteArrayWithLengthHeader(dataInputStream);
			setValue(id, value);
		} catch (EOFException ignore) {
		}
	}


	@Override
	public void close() {
		atomicStore.close();
	}

	@Override
	public void drop() {
		atomicStore.drop();
	}

	@Override
	public BitSet filter(BitSet records, BinaryFilter binaryFilter) {
		return null;
	}

}