/*
 * 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.search;

import java.io.IOException;
import java.util.Arrays;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.LongPoint;
import org.apache.lucene.document.NumericDocValuesField;
import org.apache.lucene.document.SortedDocValuesField;
import org.apache.lucene.document.SortedNumericDocValuesField;
import org.apache.lucene.document.SortedSetDocValuesField;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util.NumericUtils;
import org.apache.lucene.util.TestUtil;

public class TestDocValuesQueries extends LuceneTestCase {

  public void testDuelPointRangeSortedNumericRangeQuery() throws IOException {
    doTestDuelPointRangeNumericRangeQuery(true, 1);
  }

  public void testDuelPointRangeMultivaluedSortedNumericRangeQuery() throws IOException {
    doTestDuelPointRangeNumericRangeQuery(true, 3);
  }

  public void testDuelPointRangeNumericRangeQuery() throws IOException {
    doTestDuelPointRangeNumericRangeQuery(false, 1);
  }

  private void doTestDuelPointRangeNumericRangeQuery(boolean sortedNumeric, int maxValuesPerDoc) throws IOException {
    final int iters = atLeast(10);
    for (int iter = 0; iter < iters; ++iter) {
      Directory dir = newDirectory();
      RandomIndexWriter iw = new RandomIndexWriter(random(), dir);
      final int numDocs = atLeast(100);
      for (int i = 0; i < numDocs; ++i) {
        Document doc = new Document();
        final int numValues = TestUtil.nextInt(random(), 0, maxValuesPerDoc);
        for (int j = 0; j < numValues; ++j) {
          final long value = TestUtil.nextLong(random(), -100, 10000);
          if (sortedNumeric) {
            doc.add(new SortedNumericDocValuesField("dv", value));
          } else {
            doc.add(new NumericDocValuesField("dv", value));
          }
          doc.add(new LongPoint("idx", value));
        }
        iw.addDocument(doc);
      }
      if (random().nextBoolean()) {
        iw.deleteDocuments(LongPoint.newRangeQuery("idx", 0L, 10L));
      }
      final IndexReader reader = iw.getReader();
      final IndexSearcher searcher = newSearcher(reader, false);
      iw.close();

      for (int i = 0; i < 100; ++i) {
        final long min = random().nextBoolean() ? Long.MIN_VALUE : TestUtil.nextLong(random(), -100, 10000);
        final long max = random().nextBoolean() ? Long.MAX_VALUE : TestUtil.nextLong(random(), -100, 10000);
        final Query q1 = LongPoint.newRangeQuery("idx", min, max);
        final Query q2;
        if (sortedNumeric) {
          q2 = SortedNumericDocValuesField.newSlowRangeQuery("dv", min, max);
        } else {
          q2 = NumericDocValuesField.newSlowRangeQuery("dv", min, max);
        }
        assertSameMatches(searcher, q1, q2, false);
      }

      reader.close();
      dir.close();
    }
  }

  private void doTestDuelPointRangeSortedRangeQuery(boolean sortedSet, int maxValuesPerDoc) throws IOException {
    final int iters = atLeast(10);
    for (int iter = 0; iter < iters; ++iter) {
      Directory dir = newDirectory();
      RandomIndexWriter iw = new RandomIndexWriter(random(), dir);
      final int numDocs = atLeast(100);
      for (int i = 0; i < numDocs; ++i) {
        Document doc = new Document();
        final int numValues = TestUtil.nextInt(random(), 0, maxValuesPerDoc);
        for (int j = 0; j < numValues; ++j) {
          final long value = TestUtil.nextLong(random(), -100, 10000);
          byte[] encoded = new byte[Long.BYTES];
          LongPoint.encodeDimension(value, encoded, 0);
          if (sortedSet) {
            doc.add(new SortedSetDocValuesField("dv", new BytesRef(encoded)));
          } else {
            doc.add(new SortedDocValuesField("dv", new BytesRef(encoded)));
          }
          doc.add(new LongPoint("idx", value));
        }
        iw.addDocument(doc);
      }
      if (random().nextBoolean()) {
        iw.deleteDocuments(LongPoint.newRangeQuery("idx", 0L, 10L));
      }
      final IndexReader reader = iw.getReader();
      final IndexSearcher searcher = newSearcher(reader, false);
      iw.close();

      for (int i = 0; i < 100; ++i) {
        long min = random().nextBoolean() ? Long.MIN_VALUE : TestUtil.nextLong(random(), -100, 10000);
        long max = random().nextBoolean() ? Long.MAX_VALUE : TestUtil.nextLong(random(), -100, 10000);
        byte[] encodedMin = new byte[Long.BYTES];
        byte[] encodedMax = new byte[Long.BYTES];
        LongPoint.encodeDimension(min, encodedMin, 0);
        LongPoint.encodeDimension(max, encodedMax, 0);
        boolean includeMin = true;
        boolean includeMax = true;
        if (random().nextBoolean()) {
          includeMin = false;
          min++;
        }
        if (random().nextBoolean()) {
          includeMax = false;
          max--;
        }
        final Query q1 = LongPoint.newRangeQuery("idx", min, max);
        final Query q2;
        if (sortedSet) {
          q2 = SortedSetDocValuesField.newSlowRangeQuery("dv",
              min == Long.MIN_VALUE && random().nextBoolean() ? null : new BytesRef(encodedMin),
              max == Long.MAX_VALUE && random().nextBoolean() ? null : new BytesRef(encodedMax),
              includeMin, includeMax);
        } else {
          q2 = SortedDocValuesField.newSlowRangeQuery("dv",
              min == Long.MIN_VALUE && random().nextBoolean() ? null : new BytesRef(encodedMin),
              max == Long.MAX_VALUE && random().nextBoolean() ? null : new BytesRef(encodedMax),
              includeMin, includeMax);
        }
        assertSameMatches(searcher, q1, q2, false);
      }

      reader.close();
      dir.close();
    }
  }

  public void testDuelPointRangeSortedSetRangeQuery() throws IOException {
    doTestDuelPointRangeSortedRangeQuery(true, 1);
  }

  public void testDuelPointRangeMultivaluedSortedSetRangeQuery() throws IOException {
    doTestDuelPointRangeSortedRangeQuery(true, 3);
  }

  public void testDuelPointRangeSortedRangeQuery() throws IOException {
    doTestDuelPointRangeSortedRangeQuery(false, 1);
  }

  private void assertSameMatches(IndexSearcher searcher, Query q1, Query q2, boolean scores) throws IOException {
    final int maxDoc = searcher.getIndexReader().maxDoc();
    final TopDocs td1 = searcher.search(q1, maxDoc, scores ? Sort.RELEVANCE : Sort.INDEXORDER);
    final TopDocs td2 = searcher.search(q2, maxDoc, scores ? Sort.RELEVANCE : Sort.INDEXORDER);
    assertEquals(td1.totalHits.value, td2.totalHits.value);
    for (int i = 0; i < td1.scoreDocs.length; ++i) {
      assertEquals(td1.scoreDocs[i].doc, td2.scoreDocs[i].doc);
      if (scores) {
        assertEquals(td1.scoreDocs[i].score, td2.scoreDocs[i].score, 10e-7);
      }
    }
  }

  public void testEquals() {
    Query q1 = SortedNumericDocValuesField.newSlowRangeQuery("foo", 3, 5);
    QueryUtils.checkEqual(q1, SortedNumericDocValuesField.newSlowRangeQuery("foo", 3, 5));
    QueryUtils.checkUnequal(q1, SortedNumericDocValuesField.newSlowRangeQuery("foo", 3, 6));
    QueryUtils.checkUnequal(q1, SortedNumericDocValuesField.newSlowRangeQuery("foo", 4, 5));
    QueryUtils.checkUnequal(q1, SortedNumericDocValuesField.newSlowRangeQuery("bar", 3, 5));

    Query q2 = SortedSetDocValuesField.newSlowRangeQuery("foo", new BytesRef("bar"), new BytesRef("baz"), true, true);
    QueryUtils.checkEqual(q2, SortedSetDocValuesField.newSlowRangeQuery("foo", new BytesRef("bar"), new BytesRef("baz"), true, true));
    QueryUtils.checkUnequal(q2, SortedSetDocValuesField.newSlowRangeQuery("foo", new BytesRef("baz"), new BytesRef("baz"), true, true));
    QueryUtils.checkUnequal(q2, SortedSetDocValuesField.newSlowRangeQuery("foo", new BytesRef("bar"), new BytesRef("bar"), true, true));
    QueryUtils.checkUnequal(q2, SortedSetDocValuesField.newSlowRangeQuery("quux", new BytesRef("bar"), new BytesRef("baz"), true, true));
  }

  public void testToString() {
    Query q1 = SortedNumericDocValuesField.newSlowRangeQuery("foo", 3, 5);
    assertEquals("foo:[3 TO 5]", q1.toString());
    assertEquals("[3 TO 5]", q1.toString("foo"));
    assertEquals("foo:[3 TO 5]", q1.toString("bar"));

    Query q2 = SortedSetDocValuesField.newSlowRangeQuery("foo", new BytesRef("bar"), new BytesRef("baz"), true, true);
    assertEquals("foo:[[62 61 72] TO [62 61 7a]]", q2.toString());
    q2 = SortedSetDocValuesField.newSlowRangeQuery("foo", new BytesRef("bar"), new BytesRef("baz"), false, true);
    assertEquals("foo:{[62 61 72] TO [62 61 7a]]", q2.toString());
    q2 = SortedSetDocValuesField.newSlowRangeQuery("foo", new BytesRef("bar"), new BytesRef("baz"), false, false);
    assertEquals("foo:{[62 61 72] TO [62 61 7a]}", q2.toString());
    q2 = SortedSetDocValuesField.newSlowRangeQuery("foo", new BytesRef("bar"), null, true, true);
    assertEquals("foo:[[62 61 72] TO *}", q2.toString());
    q2 = SortedSetDocValuesField.newSlowRangeQuery("foo", null, new BytesRef("baz"), true, true);
    assertEquals("foo:{* TO [62 61 7a]]", q2.toString());
    assertEquals("{* TO [62 61 7a]]", q2.toString("foo"));
    assertEquals("foo:{* TO [62 61 7a]]", q2.toString("bar"));
  }

  public void testMissingField() throws IOException {
    Directory dir = newDirectory();
    RandomIndexWriter iw = new RandomIndexWriter(random(), dir);
    iw.addDocument(new Document());
    IndexReader reader = iw.getReader();
    iw.close();
    IndexSearcher searcher = newSearcher(reader);
    for (Query query : Arrays.asList(
        NumericDocValuesField.newSlowRangeQuery("foo", 2, 4),
        SortedNumericDocValuesField.newSlowRangeQuery("foo", 2, 4),
        SortedDocValuesField.newSlowRangeQuery("foo", new BytesRef("abc"), new BytesRef("bcd"), random().nextBoolean(), random().nextBoolean()),
        SortedSetDocValuesField.newSlowRangeQuery("foo", new BytesRef("abc"), new BytesRef("bcd"), random().nextBoolean(), random().nextBoolean()))) {
      Weight w = searcher.createWeight(searcher.rewrite(query), ScoreMode.COMPLETE, 1);
      assertNull(w.scorer(searcher.getIndexReader().leaves().get(0)));
    }
    reader.close();
    dir.close();
  }

  public void testSortedNumericNPE() throws IOException {
    Directory dir = newDirectory();
    RandomIndexWriter iw = new RandomIndexWriter(random(), dir);
    double[] nums = {-1.7147449030215377E-208, -1.6887024655302576E-11, 1.534911516604164E113, 0.0,
        2.6947996404505155E-166, -2.649722021970773E306, 6.138239235731689E-198, 2.3967090122610808E111};
    for (int i = 0; i < nums.length; ++i) {
      Document doc = new Document();
      doc.add(new SortedNumericDocValuesField("dv", NumericUtils.doubleToSortableLong(nums[i])));
      iw.addDocument(doc);
    }
    iw.commit();
    final IndexReader reader = iw.getReader();
    final IndexSearcher searcher = newSearcher(reader);
    iw.close();

    final long lo = NumericUtils.doubleToSortableLong(8.701032080293731E-226);
    final long hi = NumericUtils.doubleToSortableLong(2.0801416404385346E-41);
    
    Query query = SortedNumericDocValuesField.newSlowRangeQuery("dv", lo, hi);
    // TODO: assert expected matches
    searcher.search(query, searcher.reader.maxDoc(), Sort.INDEXORDER);

    // swap order, should still work
    query = SortedNumericDocValuesField.newSlowRangeQuery("dv", hi, lo);
    // TODO: assert expected matches
    searcher.search(query, searcher.reader.maxDoc(), Sort.INDEXORDER);
    
    reader.close();
    dir.close();
  }
}