/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * 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 the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>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.apereo.portal.portlets.search;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.ImmutableSet;
import java.io.Serializable;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentMap;
import org.apereo.portal.search.SearchResult;
import org.apereo.portal.utils.Tuple;

/**
 * Used to collate search results for the SearchPortletController.
 *
 */
public class PortalSearchResults implements Serializable {
    private static final long serialVersionUID = 1L;

    private final Set<String> defaultTab;
    //Map of <result type, Set<result tabs>>
    private final Map<String, Set<String>> resultTypeMappings;

    //Map of <tab-key, List<result, url>>
    private final LoadingCache<String, List<Tuple<SearchResult, String>>> results;

    public PortalSearchResults(String defaultTab, Map<String, Set<String>> resultTypeMappings) {
        this.defaultTab = ImmutableSet.of(defaultTab);
        this.resultTypeMappings = resultTypeMappings;

        this.results =
                CacheBuilder.newBuilder()
                        .build(
                                new CacheLoader<String, List<Tuple<SearchResult, String>>>() {
                                    @Override
                                    public List<Tuple<SearchResult, String>> load(String key)
                                            throws Exception {
                                        return Collections.synchronizedList(
                                                new LinkedList<Tuple<SearchResult, String>>());
                                    }
                                });
    }

    /** @return Map of tabKey -> Tuple<result, url> */
    public ConcurrentMap<String, List<Tuple<SearchResult, String>>> getResults() {
        return this.results.asMap();
    }

    public void addPortletSearchResults(String url, SearchResult result) {
        final Set<String> tabs = this.getTabs(result);
        for (final String tab : tabs) {
            final List<Tuple<SearchResult, String>> typeResults = this.results.getUnchecked(tab);
            typeResults.add(new Tuple<>(result, url));
        }
    }

    protected Set<String> getTabs(SearchResult result) {
        final List<String> types = result.getType();

        //Result set no type, use the default tab
        if (types == null || types.isEmpty()) {
            return this.defaultTab;
        }

        final Set<String> tabs = new HashSet<>();

        //For each type the search result declares lookup the tab(s) mapped to that type
        for (final String type : types) {
            final Set<String> mappedTabs = this.resultTypeMappings.get(type);
            if (mappedTabs != null) {
                tabs.addAll(mappedTabs);
            } else {
                tabs.addAll(this.defaultTab);
            }
        }

        return tabs;
    }
}