/*
 * 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.analysis.morfologik;

import java.io.IOException;
import java.util.Collections;
import java.util.TreeSet;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.CharArraySet;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.miscellaneous.SetKeywordMarkerFilter;
import org.apache.lucene.analysis.standard.StandardTokenizer;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.tests.analysis.BaseTokenStreamTestCase;

/** TODO: The tests below rely on the order of returned lemmas, which is probably not good. */
public class TestMorfologikAnalyzer extends BaseTokenStreamTestCase {

  private Analyzer getTestAnalyzer() {
    return new MorfologikAnalyzer();
  }

  /** Test stemming of single tokens with Morfologik library. */
  public final void testSingleTokens() throws IOException {
    Analyzer a = getTestAnalyzer();
    assertAnalyzesTo(a, "a", new String[] {"a"});
    assertAnalyzesTo(a, "liście", new String[] {"liście", "liść", "list", "lista"});
    assertAnalyzesTo(a, "danych", new String[] {"dany", "dana", "dane", "dać"});
    assertAnalyzesTo(a, "ęóąśłżźćń", new String[] {"ęóąśłżźćń"});
    a.close();
  }

  /** Test stemming of multiple tokens and proper term metrics. */
  public final void testMultipleTokens() throws IOException {
    Analyzer a = getTestAnalyzer();
    assertAnalyzesTo(
        a,
        "liście danych",
        new String[] {"liście", "liść", "list", "lista", "dany", "dana", "dane", "dać"},
        new int[] {0, 0, 0, 0, 7, 7, 7, 7},
        new int[] {6, 6, 6, 6, 13, 13, 13, 13},
        new int[] {1, 0, 0, 0, 1, 0, 0, 0});

    assertAnalyzesTo(
        a,
        "T. Gl\u00FCcksberg",
        new String[] {"tom", "tona", "Gl\u00FCcksberg"},
        new int[] {0, 0, 3},
        new int[] {1, 1, 13},
        new int[] {1, 0, 1});
    a.close();
  }

  @SuppressWarnings("unused")
  private void dumpTokens(String input) throws IOException {
    try (Analyzer a = getTestAnalyzer();
        TokenStream ts = a.tokenStream("dummy", input)) {
      ts.reset();

      MorphosyntacticTagsAttribute attribute = ts.getAttribute(MorphosyntacticTagsAttribute.class);
      CharTermAttribute charTerm = ts.getAttribute(CharTermAttribute.class);
      while (ts.incrementToken()) {
        System.out.println(charTerm.toString() + " => " + attribute.getTags());
      }
      ts.end();
    }
  }

  /** Test reuse of MorfologikFilter with leftover stems. */
  public final void testLeftoverStems() throws IOException {
    Analyzer a = getTestAnalyzer();
    try (TokenStream ts_1 = a.tokenStream("dummy", "liście")) {
      CharTermAttribute termAtt_1 = ts_1.getAttribute(CharTermAttribute.class);
      ts_1.reset();
      ts_1.incrementToken();
      assertEquals("first stream", "liście", termAtt_1.toString());
      ts_1.end();
    }

    try (TokenStream ts_2 = a.tokenStream("dummy", "danych")) {
      CharTermAttribute termAtt_2 = ts_2.getAttribute(CharTermAttribute.class);
      ts_2.reset();
      ts_2.incrementToken();
      assertEquals("second stream", "dany", termAtt_2.toString());
      ts_2.end();
    }
    a.close();
  }

  /** Test stemming of mixed-case tokens. */
  public final void testCase() throws IOException {
    Analyzer a = getTestAnalyzer();

    assertAnalyzesTo(a, "AGD", new String[] {"AGD", "artykuły gospodarstwa domowego"});
    assertAnalyzesTo(a, "agd", new String[] {"artykuły gospodarstwa domowego"});

    assertAnalyzesTo(a, "Poznania", new String[] {"Poznań"});
    assertAnalyzesTo(a, "poznania", new String[] {"poznanie", "poznać"});

    assertAnalyzesTo(a, "Aarona", new String[] {"Aaron"});
    assertAnalyzesTo(a, "aarona", new String[] {"aarona"});

    assertAnalyzesTo(a, "Liście", new String[] {"liście", "liść", "list", "lista"});
    a.close();
  }

  private void assertPOSToken(TokenStream ts, String term, String... tags) throws IOException {
    ts.incrementToken();
    assertEquals(term, ts.getAttribute(CharTermAttribute.class).toString());

    TreeSet<String> actual = new TreeSet<>();
    TreeSet<String> expected = new TreeSet<>();
    for (StringBuilder b : ts.getAttribute(MorphosyntacticTagsAttribute.class).getTags()) {
      actual.add(b.toString());
    }
    Collections.addAll(expected, tags);

    if (!expected.equals(actual)) {
      System.out.println("Expected:\n" + expected);
      System.out.println("Actual:\n" + actual);
      assertEquals(expected, actual);
    }
  }

  /** Test morphosyntactic annotations. */
  public final void testPOSAttribute() throws IOException {
    try (Analyzer a = getTestAnalyzer();
        TokenStream ts = a.tokenStream("dummy", "liście")) {
      ts.reset();
      assertPOSToken(ts, "liście", "subst:sg:acc:n2", "subst:sg:nom:n2", "subst:sg:voc:n2");
      assertPOSToken(ts, "liść", "subst:pl:acc:m3", "subst:pl:nom:m3", "subst:pl:voc:m3");
      assertPOSToken(ts, "list", "subst:sg:loc:m3", "subst:sg:voc:m3");
      assertPOSToken(ts, "lista", "subst:sg:dat:f", "subst:sg:loc:f");
      ts.end();
    }
  }

  /** */
  public final void testKeywordAttrTokens() throws IOException {
    Analyzer a =
        new MorfologikAnalyzer() {
          @Override
          protected TokenStreamComponents createComponents(String field) {
            final CharArraySet keywords = new CharArraySet(1, false);
            keywords.add("liście");

            final Tokenizer src = new StandardTokenizer();
            TokenStream result = new SetKeywordMarkerFilter(src, keywords);
            result = new MorfologikFilter(result);

            return new TokenStreamComponents(src, result);
          }
        };

    assertAnalyzesTo(
        a,
        "liście danych",
        new String[] {"liście", "dany", "dana", "dane", "dać"},
        new int[] {0, 7, 7, 7, 7},
        new int[] {6, 13, 13, 13, 13},
        new int[] {1, 1, 0, 0, 0});
    a.close();
  }

  /** blast some random strings through the analyzer */
  public void testRandom() throws Exception {
    Analyzer a = getTestAnalyzer();
    checkRandomData(random(), a, 1000 * RANDOM_MULTIPLIER);
    a.close();
  }
}
