/*
 * 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.maven.archetype.ui.generation;

import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.apache.maven.archetype.catalog.Archetype;

/**
 * @author Olivier Lamy
 * @since 2.1
 */
public class ArchetypeSelectorUtils {
    private ArchetypeSelectorUtils() {
        // no constructor for utility class
    }

    private static String extractGroupIdFromFilter(String filter) {
        return StringUtils.contains(filter, ':') ? StringUtils.substringBefore(filter, ":") : null;
    }

    private static String extractArtifactIdFromFilter(String filter) {
        // if no : the full text is considered as artifactId content
        return StringUtils.contains(filter, ':') ? StringUtils.substringAfter(filter, ":") : filter;
    }

    /**
     * Apply some filtering on archetypes.
     * currently only on artifactId contains filter.
     *
     * @param archetypesPerCatalog
     * @return
     */
    public static Map<String, List<Archetype>> getFilteredArchetypesByCatalog(
            Map<String, List<Archetype>> archetypesPerCatalog, String filter) {
        if (archetypesPerCatalog == null || archetypesPerCatalog.isEmpty()) {
            return Collections.emptyMap();
        }
        Map<String, List<Archetype>> filtered = new LinkedHashMap<>(archetypesPerCatalog.size());

        for (Map.Entry<String, List<Archetype>> entry : archetypesPerCatalog.entrySet()) {
            List<Archetype> archetypes = new ArrayList<>();

            for (Archetype archetype : entry.getValue()) {
                String groupId = ArchetypeSelectorUtils.extractGroupIdFromFilter(filter);
                String artifactId = ArchetypeSelectorUtils.extractArtifactIdFromFilter(filter);

                if (((groupId == null) || StringUtils.contains(archetype.getGroupId(), groupId))
                        && StringUtils.contains(archetype.getArtifactId(), artifactId)) {
                    archetypes.add(archetype);
                }
            }

            if (!archetypes.isEmpty()) {
                filtered.put(entry.getKey(), archetypes);
            }
        }

        return filtered;
    }
}
