/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.elasticsearch.search.suggest;

import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.util.ExtensionPoint;
import org.elasticsearch.script.ScriptService;
import org.elasticsearch.search.suggest.completion.CompletionSuggester;
import org.elasticsearch.search.suggest.phrase.PhraseSuggester;
import org.elasticsearch.search.suggest.term.TermSuggester;

import java.util.*;

/**
 *
 */
public final class Suggesters extends ExtensionPoint.ClassMap<Suggester> {
    private final Map<String, Suggester> parsers;

    public Suggesters() {
        this(Collections.EMPTY_MAP);
    }

    public Suggesters(Map<String, Suggester> suggesters) {
        super("suggester", Suggester.class, new HashSet<>(Arrays.asList("phrase", "term", "completion")), Suggesters.class, SuggestParseElement.class, SuggestPhase.class);
        this.parsers = Collections.unmodifiableMap(suggesters);
    }

    @Inject
    public Suggesters(Map<String, Suggester> suggesters, ScriptService scriptService) {
        this(addBuildIns(suggesters, scriptService));
    }

    private static Map<String, Suggester> addBuildIns(Map<String, Suggester> suggesters, ScriptService scriptService) {
        final Map<String, Suggester> map = new HashMap<>();
        map.put("phrase", new PhraseSuggester(scriptService));
        map.put("term", new TermSuggester());
        map.put("completion", new CompletionSuggester());
        map.putAll(suggesters);
        return map;
    }

    public Suggester get(String type) {
        return parsers.get(type);
    }
}