/*
 * 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.lucene.benchmark.byTask.feeds;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.benchmark.byTask.tasks.NewAnalyzerTask;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.WildcardQuery;
import org.apache.lucene.search.spans.SpanFirstQuery;
import org.apache.lucene.search.spans.SpanNearQuery;
import org.apache.lucene.search.spans.SpanQuery;
import org.apache.lucene.search.spans.SpanTermQuery;

/**
 * A QueryMaker that makes queries devised manually (by Grant Ingersoll) for searching in the
 * Reuters collection.
 */
public class ReutersQueryMaker extends AbstractQueryMaker implements QueryMaker {

  private static String[] STANDARD_QUERIES = {
    // Start with some short queries
    "Salomon",
    "Comex",
    "night trading",
    "Japan Sony",
    // Try some Phrase Queries
    "\"Sony Japan\"",
    "\"food needs\"~3",
    "\"World Bank\"^2 AND Nigeria",
    "\"World Bank\" -Nigeria",
    "\"Ford Credit\"~5",
    // Try some longer queries
    "airline Europe Canada destination",
    "Long term pressure by trade "
        + "ministers is necessary if the current Uruguay round of talks on "
        + "the General Agreement on Trade and Tariffs (GATT) is to "
        + "succeed"
  };

  private static Query[] getPrebuiltQueries(String field) {
    //  be wary of unanalyzed text
    return new Query[] {
      new SpanFirstQuery(new SpanTermQuery(new Term(field, "ford")), 5),
      new SpanNearQuery(
          new SpanQuery[] {
            new SpanTermQuery(new Term(field, "night")),
            new SpanTermQuery(new Term(field, "trading"))
          },
          4,
          false),
      new SpanNearQuery(
          new SpanQuery[] {
            new SpanFirstQuery(new SpanTermQuery(new Term(field, "ford")), 10),
            new SpanTermQuery(new Term(field, "credit"))
          },
          10,
          false),
      new WildcardQuery(new Term(field, "fo*")),
    };
  }

  /**
   * Parse the strings containing Lucene queries.
   *
   * @param qs array of strings containing query expressions
   * @param a analyzer to use when parsing queries
   * @return array of Lucene queries
   */
  private static Query[] createQueries(List<Object> qs, Analyzer a) {
    QueryParser qp = new QueryParser(DocMaker.BODY_FIELD, a);
    List<Object> queries = new ArrayList<>();
    for (int i = 0; i < qs.size(); i++) {
      try {

        Object query = qs.get(i);
        Query q = null;
        if (query instanceof String) {
          q = qp.parse((String) query);

        } else if (query instanceof Query) {
          q = (Query) query;

        } else {
          System.err.println("Unsupported Query Type: " + query);
        }

        if (q != null) {
          queries.add(q);
        }

      } catch (Exception e) {
        e.printStackTrace();
      }
    }

    return queries.toArray(new Query[0]);
  }

  @Override
  protected Query[] prepareQueries() throws Exception {
    // analyzer (default is standard analyzer)
    Analyzer anlzr =
        NewAnalyzerTask.createAnalyzer(
            config.get("analyzer", "org.apache.lucene.analysis.standard.StandardAnalyzer"));

    List<Object> queryList = new ArrayList<>(20);
    queryList.addAll(Arrays.asList(STANDARD_QUERIES));
    queryList.addAll(Arrays.asList(getPrebuiltQueries(DocMaker.BODY_FIELD)));
    return createQueries(queryList, anlzr);
  }
}