/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.
 */
package org.apache.jackrabbit.oak.index.indexer.document.flatfile;

import org.apache.jackrabbit.oak.commons.collections.IterableUtils;
import org.apache.jackrabbit.oak.commons.collections.ListUtils;
import org.apache.jackrabbit.oak.index.indexer.document.NodeStateEntry;
import org.apache.jackrabbit.oak.index.indexer.document.NodeStateEntry.NodeStateEntryBuilder;
import org.apache.jackrabbit.oak.spi.state.NodeBuilder;
import org.apache.jackrabbit.oak.spi.state.NodeState;

import java.util.Comparator;
import java.util.List;
import java.util.Set;
import java.util.function.Predicate;

import static java.util.Collections.emptySet;
import static java.util.stream.Collectors.toList;
import static org.apache.jackrabbit.oak.commons.PathUtils.elements;
import static org.apache.jackrabbit.oak.plugins.memory.EmptyNodeState.EMPTY_NODE;

public class TestUtils {

    static List<String> sortPaths(List<String> paths) {
        return sortPaths(paths, emptySet());
    }

    static List<String> sortPaths(List<String> paths, Set<String> preferredElements) {
        return sortPaths(paths, new PathElementComparator(preferredElements));
    }

    static List<String> extractPredicatePaths(List<String> paths, Predicate<String> pathPredicate) {
        return paths.stream().filter(pathPredicate).collect(toList());
    }

    static List<String> sortPaths(List<String> paths, Comparator<Iterable<String>> comparator) {
        List<Iterable<String>> copy = paths.stream()
                .map(p -> ListUtils.toList(elements(p)))
                .sorted(comparator)
                .collect(toList());
        return copy.stream().map(e -> "/" + String.join("/", e)).collect(toList());
    }

    static CountingIterable<NodeStateEntry> createList(Set<String> preferred, List<String> paths) {
        return new CountingIterable<>(createEntries(sortPaths(paths, preferred)));
    }

    static Iterable<NodeStateEntry> createEntries(List<String> paths) {
        return IterableUtils.transform(paths, p -> new NodeStateEntryBuilder(createNodeState(p), p).withID(getID(p)).build());
    }

    static String getID(String path) {
        int slashCount = 0, fromIndex = 0;
        while ( (fromIndex = path.indexOf("/", fromIndex) + 1) != 0) {
            slashCount++;
        }
        return slashCount + ":" + path;
    }

    static NodeState createNodeState(String p) {
        NodeBuilder builder = EMPTY_NODE.builder();
        builder.setProperty("path", p);
        return builder.getNodeState();
    }
}
