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/*
 * Copyright 2015 Alex Butler
 *
 * 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.
 */
package alexh.weak;

import static java.util.stream.Collectors.toCollection;
import java.util.LinkedList;
import java.util.function.Predicate;
import java.util.stream.Stream;

class DynamicChildLogic {

    static DynamicChildLogic using(DynamicChild child) {
        return new DynamicChildLogic(child);
    }

    private final DynamicChild child;

    private DynamicChildLogic(DynamicChild child) {
        this.child = child;
    }

    public LinkedList getAscendingKeyChainWithRoot() {
        LinkedList ascending = getAscendingChainAllWith(dc -> true);
        return Stream.concat(Stream.of(ascending.getFirst().parent()), ascending.stream())
            .map(child -> child.key().asObject())
            .collect(toCollection(LinkedList::new));
    }

    public LinkedList getAscendingChainAllWith(Predicate pd) {
        LinkedList chain = new LinkedList<>();
        if (!pd.test(child)) return chain;

        chain.add(child);

        Dynamic nextParent = child.parent();
        while (nextParent instanceof DynamicChild && pd.test((DynamicChild) nextParent)) {
            chain.addFirst((DynamicChild) nextParent);
            nextParent = ((DynamicChild) nextParent).parent();
        }
        return chain;
    }
}