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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.pojo;


import org.teamapps.universaldb.record.EntityBuilder;

import java.util.*;
import java.util.stream.Collectors;

public class EntityBitSetList implements List {

	private final EntityBuilder entityBuilder;
	private final BitSet records;
	private final int count;
	private int[] ids;

	public EntityBitSetList(EntityBuilder entityBuilder, BitSet records) {
		this.entityBuilder = entityBuilder;
		this.records = records;
		this.count = records.cardinality();
	}

	private void checkIdsArray() {
		if (ids != null) {
			return;
		}
		ids = new int[count];
		int pos = 0;
		for (int id = records.nextSetBit(0); id >= 0; id = records.nextSetBit(id + 1)) {
			ids[pos++] = id;
		}
	}

	@Override
	public int size() {
		return count;
	}

	@Override
	public boolean isEmpty() {
		return count == 0;
	}

	@Override
	public boolean contains(Object o) {
		Entity entity = (Entity) o;
		int id = entity.getId();
		return records.get(id);
	}

	@Override
	public Iterator iterator() {
		return new EntityIterator<>(entityBuilder, records);
	}

	@Override
	public Object[] toArray() {
		List list = new ArrayList<>();
		checkIdsArray();
		for (int id : ids) {
			list.add(entityBuilder.build(id));
		}
		return list.toArray();
	}

	@Override
	public  T[] toArray(T[] a) {
		List list = new ArrayList<>();
		checkIdsArray();
		for (int id : ids) {
			list.add(entityBuilder.build(id));
		}
		return list.toArray(a);
	}

	@Override
	public boolean add(ENTITY entity) {
		throw new UnsupportedOperationException();
	}

	@Override
	public boolean remove(Object o) {
		throw new UnsupportedOperationException();
	}

	@Override
	public boolean containsAll(Collection c) {
		throw new UnsupportedOperationException();
	}

	@Override
	public boolean addAll(Collection c) {
		throw new UnsupportedOperationException();
	}

	@Override
	public boolean addAll(int index, Collection c) {
		throw new UnsupportedOperationException();
	}

	@Override
	public boolean removeAll(Collection c) {
		throw new UnsupportedOperationException();
	}

	@Override
	public boolean retainAll(Collection c) {
		throw new UnsupportedOperationException();
	}

	@Override
	public void clear() {
		throw new UnsupportedOperationException();
	}

	@Override
	public ENTITY get(int index) {
		checkIdsArray();
		return entityBuilder.build(ids[index]);
	}

	@Override
	public ENTITY set(int index, ENTITY element) {
		throw new UnsupportedOperationException();
	}

	@Override
	public void add(int index, ENTITY element) {
		throw new UnsupportedOperationException();
	}

	@Override
	public ENTITY remove(int index) {
		throw new UnsupportedOperationException();
	}

	@Override
	public int indexOf(Object o) {
		checkIdsArray();
		Entity entity = (Entity) o;
		int id = entity.getId();
		for (int i = 0; i < ids.length; i++) {
			if (ids[i] == id) {
				return i;
			}
		}
		return -1;
	}

	@Override
	public int lastIndexOf(Object o) {
		return indexOf(o);
	}

	@Override
	public ListIterator listIterator() {
		return new ArrayList<>(this).listIterator();
	}

	@Override
	public ListIterator listIterator(int index) {
		return new ArrayList<>(this).listIterator(index);
	}

	@Override
	public List subList(int fromIndex, int toIndex) {
		return stream().skip(fromIndex).limit(toIndex - fromIndex).collect(Collectors.toList());
	}

	@Override
	public void sort(Comparator c) {
		throw new UnsupportedOperationException();
	}
}