/*
 * 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.icu.segmentation;

import com.ibm.icu.lang.UScript;
import com.ibm.icu.text.UnicodeSet;
import java.io.IOException;
import java.io.StringReader;
import java.util.Arrays;
import java.util.Random;
import java.util.concurrent.CountDownLatch;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.icu.tokenattributes.ScriptAttribute;
import org.apache.lucene.tests.analysis.BaseTokenStreamTestCase;

public class TestICUTokenizer extends BaseTokenStreamTestCase {

  public void testHugeDoc() throws IOException {
    StringBuilder sb = new StringBuilder();
    char[] whitespace = new char[4094];
    Arrays.fill(whitespace, ' ');
    sb.append(whitespace);
    sb.append("testing 1234");
    String input = sb.toString();
    ICUTokenizer tokenizer =
        new ICUTokenizer(newAttributeFactory(), new DefaultICUTokenizerConfig(false, true));
    tokenizer.setReader(new StringReader(input));
    assertTokenStreamContents(tokenizer, new String[] {"testing", "1234"});
  }

  public void testHugeTerm2() throws IOException {
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < 40960; i++) {
      sb.append('a');
    }
    String input = sb.toString();
    ICUTokenizer tokenizer =
        new ICUTokenizer(newAttributeFactory(), new DefaultICUTokenizerConfig(false, true));
    tokenizer.setReader(new StringReader(input));
    char[] token = new char[4096];
    Arrays.fill(token, 'a');
    String expectedToken = new String(token);
    String[] expected = {
      expectedToken, expectedToken, expectedToken,
      expectedToken, expectedToken, expectedToken,
      expectedToken, expectedToken, expectedToken,
      expectedToken
    };
    assertTokenStreamContents(tokenizer, expected);
  }

  private Analyzer a;

  @Override
  public void setUp() throws Exception {
    super.setUp();
    a =
        new Analyzer() {
          @Override
          protected TokenStreamComponents createComponents(String fieldName) {
            Tokenizer tokenizer =
                new ICUTokenizer(newAttributeFactory(), new DefaultICUTokenizerConfig(false, true));
            return new TokenStreamComponents(tokenizer);
          }
        };
  }

  @Override
  public void tearDown() throws Exception {
    a.close();
    super.tearDown();
  }

  public void testArmenian() throws Exception {
    assertAnalyzesTo(
        a,
        "Վիքիպեդիայի 13 միլիոն հոդվածները (4,600` հայերեն վիքիպեդիայում) գրվել են կամավորների կողմից ու համարյա բոլոր հոդվածները կարող է խմբագրել ցանկաց մարդ ով կարող է բացել Վիքիպեդիայի կայքը։",
        new String[] {
          "Վիքիպեդիայի",
          "13",
          "միլիոն",
          "հոդվածները",
          "4,600",
          "հայերեն",
          "վիքիպեդիայում",
          "գրվել",
          "են",
          "կամավորների",
          "կողմից",
          "ու",
          "համարյա",
          "բոլոր",
          "հոդվածները",
          "կարող",
          "է",
          "խմբագրել",
          "ցանկաց",
          "մարդ",
          "ով",
          "կարող",
          "է",
          "բացել",
          "Վիքիպեդիայի",
          "կայքը"
        });
  }

  public void testAmharic() throws Exception {
    assertAnalyzesTo(
        a,
        "ዊኪፔድያ የባለ ብዙ ቋንቋ የተሟላ ትክክለኛና ነጻ መዝገበ ዕውቀት (ኢንሳይክሎፒዲያ) ነው። ማንኛውም",
        new String[] {
          "ዊኪፔድያ",
          "የባለ",
          "ብዙ",
          "ቋንቋ",
          "የተሟላ",
          "ትክክለኛና",
          "ነጻ",
          "መዝገበ",
          "ዕውቀት",
          "ኢንሳይክሎፒዲያ",
          "ነው",
          "ማንኛውም"
        });
  }

  public void testArabic() throws Exception {
    assertAnalyzesTo(
        a,
        "الفيلم الوثائقي الأول عن ويكيبيديا يسمى \"الحقيقة بالأرقام: قصة ويكيبيديا\" (بالإنجليزية: Truth in Numbers: The Wikipedia Story)، سيتم إطلاقه في 2008.",
        new String[] {
          "الفيلم",
          "الوثائقي",
          "الأول",
          "عن",
          "ويكيبيديا",
          "يسمى",
          "الحقيقة",
          "بالأرقام",
          "قصة",
          "ويكيبيديا",
          "بالإنجليزية",
          "Truth",
          "in",
          "Numbers",
          "The",
          "Wikipedia",
          "Story",
          "سيتم",
          "إطلاقه",
          "في",
          "2008"
        });
  }

  public void testAramaic() throws Exception {
    assertAnalyzesTo(
        a,
        "ܘܝܩܝܦܕܝܐ (ܐܢܓܠܝܐ: Wikipedia) ܗܘ ܐܝܢܣܩܠܘܦܕܝܐ ܚܐܪܬܐ ܕܐܢܛܪܢܛ ܒܠܫܢ̈ܐ ܣܓܝܐ̈ܐ܂ ܫܡܗ ܐܬܐ ܡܢ ܡ̈ܠܬܐ ܕ\"ܘܝܩܝ\" ܘ\"ܐܝܢܣܩܠܘܦܕܝܐ\"܀",
        new String[] {
          "ܘܝܩܝܦܕܝܐ",
          "ܐܢܓܠܝܐ",
          "Wikipedia",
          "ܗܘ",
          "ܐܝܢܣܩܠܘܦܕܝܐ",
          "ܚܐܪܬܐ",
          "ܕܐܢܛܪܢܛ",
          "ܒܠܫܢ̈ܐ",
          "ܣܓܝܐ̈ܐ",
          "ܫܡܗ",
          "ܐܬܐ",
          "ܡܢ",
          "ܡ̈ܠܬܐ",
          "ܕ",
          "ܘܝܩܝ",
          "ܘ",
          "ܐܝܢܣܩܠܘܦܕܝܐ"
        });
  }

  public void testBengali() throws Exception {
    assertAnalyzesTo(
        a,
        "এই বিশ্বকোষ পরিচালনা করে উইকিমিডিয়া ফাউন্ডেশন (একটি অলাভজনক সংস্থা)। উইকিপিডিয়ার শুরু ১৫ জানুয়ারি, ২০০১ সালে। এখন পর্যন্ত ২০০টিরও বেশী ভাষায় উইকিপিডিয়া রয়েছে।",
        new String[] {
          "এই",
          "বিশ্বকোষ",
          "পরিচালনা",
          "করে",
          "উইকিমিডিয়া",
          "ফাউন্ডেশন",
          "একটি",
          "অলাভজনক",
          "সংস্থা",
          "উইকিপিডিয়ার",
          "শুরু",
          "১৫",
          "জানুয়ারি",
          "২০০১",
          "সালে",
          "এখন",
          "পর্যন্ত",
          "২০০টিরও",
          "বেশী",
          "ভাষায়",
          "উইকিপিডিয়া",
          "রয়েছে"
        });
  }

  public void testFarsi() throws Exception {
    assertAnalyzesTo(
        a,
        "ویکی پدیای انگلیسی در تاریخ ۲۵ دی ۱۳۷۹ به صورت مکملی برای دانشنامهٔ تخصصی نوپدیا نوشته شد.",
        new String[] {
          "ویکی",
          "پدیای",
          "انگلیسی",
          "در",
          "تاریخ",
          "۲۵",
          "دی",
          "۱۳۷۹",
          "به",
          "صورت",
          "مکملی",
          "برای",
          "دانشنامهٔ",
          "تخصصی",
          "نوپدیا",
          "نوشته",
          "شد"
        });
  }

  public void testGreek() throws Exception {
    assertAnalyzesTo(
        a,
        "Γράφεται σε συνεργασία από εθελοντές με το λογισμικό wiki, κάτι που σημαίνει ότι άρθρα μπορεί να προστεθούν ή να αλλάξουν από τον καθένα.",
        new String[] {
          "Γράφεται",
          "σε",
          "συνεργασία",
          "από",
          "εθελοντές",
          "με",
          "το",
          "λογισμικό",
          "wiki",
          "κάτι",
          "που",
          "σημαίνει",
          "ότι",
          "άρθρα",
          "μπορεί",
          "να",
          "προστεθούν",
          "ή",
          "να",
          "αλλάξουν",
          "από",
          "τον",
          "καθένα"
        });
  }

  public void testKhmer() throws Exception {
    assertAnalyzesTo(
        a,
        "ផ្ទះស្កឹមស្កៃបីបួនខ្នងនេះ",
        new String[] {"ផ្ទះ", "ស្កឹមស្កៃ", "បី", "បួន", "ខ្នង", "នេះ"});
  }

  public void testLao() throws Exception {
    assertAnalyzesTo(a, "ກວ່າດອກ", new String[] {"ກວ່າ", "ດອກ"});
    assertAnalyzesTo(
        a, "ພາສາລາວ", new String[] {"ພາສາ", "ລາວ"}, new String[] {"<ALPHANUM>", "<ALPHANUM>"});
  }

  public void testMyanmar() throws Exception {
    assertAnalyzesTo(
        a, "သက်ဝင်လှုပ်ရှားစေပြီး", new String[] {"သက်ဝင်", "လှုပ်ရှား", "စေ", "ပြီး"});
  }

  public void testThai() throws Exception {
    assertAnalyzesTo(
        a,
        "การที่ได้ต้องแสดงว่างานดี. แล้วเธอจะไปไหน? ๑๒๓๔",
        new String[] {
          "การ", "ที่", "ได้", "ต้อง", "แสดง", "ว่า", "งาน", "ดี", "แล้ว", "เธอ", "จะ", "ไป", "ไหน",
          "๑๒๓๔"
        });
  }

  public void testTibetan() throws Exception {
    assertAnalyzesTo(
        a,
        "སྣོན་མཛོད་དང་ལས་འདིས་བོད་ཡིག་མི་ཉམས་གོང་འཕེལ་དུ་གཏོང་བར་ཧ་ཅང་དགེ་མཚན་མཆིས་སོ། །",
        new String[] {
          "སྣོན", "མཛོད", "དང", "ལས", "འདིས", "བོད", "ཡིག", "མི", "ཉམས", "གོང", "འཕེལ", "དུ",
          "གཏོང", "བར", "ཧ", "ཅང", "དགེ", "མཚན", "མཆིས", "སོ"
        });
  }

  /*
   * For chinese, tokenize as char (these can later form bigrams or whatever)
   */
  public void testChinese() throws Exception {
    assertAnalyzesTo(
        a, "我是中国人。 １２３４ Ｔｅｓｔｓ ", new String[] {"我", "是", "中", "国", "人", "１２３４", "Ｔｅｓｔｓ"});
  }

  public void testHebrew() throws Exception {
    assertAnalyzesTo(a, "דנקנר תקף את הדו\"ח", new String[] {"דנקנר", "תקף", "את", "הדו\"ח"});
    assertAnalyzesTo(a, "חברת בת של מודי'ס", new String[] {"חברת", "בת", "של", "מודי'ס"});
  }

  public void testEmpty() throws Exception {
    assertAnalyzesTo(a, "", new String[] {});
    assertAnalyzesTo(a, ".", new String[] {});
    assertAnalyzesTo(a, " ", new String[] {});
  }

  /* test various jira issues this analyzer is related to */

  public void testLUCENE1545() throws Exception {
    /*
     * Standard analyzer does not correctly tokenize combining character U+0364 COMBINING LATIN SMALL LETTRE E.
     * The word "moͤchte" is incorrectly tokenized into "mo" "chte", the combining character is lost.
     * Expected result is only on token "moͤchte".
     */
    assertAnalyzesTo(a, "moͤchte", new String[] {"moͤchte"});
  }

  /* Tests from StandardAnalyzer, just to show behavior is similar */
  public void testAlphanumericSA() throws Exception {
    // alphanumeric tokens
    assertAnalyzesTo(a, "B2B", new String[] {"B2B"});
    assertAnalyzesTo(a, "2B", new String[] {"2B"});
  }

  public void testDelimitersSA() throws Exception {
    // other delimiters: "-", "/", ","
    assertAnalyzesTo(a, "some-dashed-phrase", new String[] {"some", "dashed", "phrase"});
    assertAnalyzesTo(a, "dogs,chase,cats", new String[] {"dogs", "chase", "cats"});
    assertAnalyzesTo(a, "ac/dc", new String[] {"ac", "dc"});
  }

  public void testApostrophesSA() throws Exception {
    // internal apostrophes: O'Reilly, you're, O'Reilly's
    assertAnalyzesTo(a, "O'Reilly", new String[] {"O'Reilly"});
    assertAnalyzesTo(a, "you're", new String[] {"you're"});
    assertAnalyzesTo(a, "she's", new String[] {"she's"});
    assertAnalyzesTo(a, "Jim's", new String[] {"Jim's"});
    assertAnalyzesTo(a, "don't", new String[] {"don't"});
    assertAnalyzesTo(a, "O'Reilly's", new String[] {"O'Reilly's"});
  }

  public void testNumericSA() throws Exception {
    // floating point, serial, model numbers, ip addresses, etc.
    // every other segment must have at least one digit
    assertAnalyzesTo(a, "21.35", new String[] {"21.35"});
    assertAnalyzesTo(a, "R2D2 C3PO", new String[] {"R2D2", "C3PO"});
    assertAnalyzesTo(a, "216.239.63.104", new String[] {"216.239.63.104"});
    assertAnalyzesTo(a, "216.239.63.104", new String[] {"216.239.63.104"});
  }

  public void testTextWithNumbersSA() throws Exception {
    // numbers
    assertAnalyzesTo(a, "David has 5000 bones", new String[] {"David", "has", "5000", "bones"});
  }

  public void testVariousTextSA() throws Exception {
    // various
    assertAnalyzesTo(
        a, "C embedded developers wanted", new String[] {"C", "embedded", "developers", "wanted"});
    assertAnalyzesTo(a, "foo bar FOO BAR", new String[] {"foo", "bar", "FOO", "BAR"});
    assertAnalyzesTo(a, "foo      bar .  FOO <> BAR", new String[] {"foo", "bar", "FOO", "BAR"});
    assertAnalyzesTo(a, "\"QUOTED\" word", new String[] {"QUOTED", "word"});
  }

  public void testKoreanSA() throws Exception {
    // Korean words
    assertAnalyzesTo(a, "안녕하세요 한글입니다", new String[] {"안녕하세요", "한글입니다"});
  }

  public void testReusableTokenStream() throws Exception {
    assertAnalyzesTo(
        a,
        "སྣོན་མཛོད་དང་ལས་འདིས་བོད་ཡིག་མི་ཉམས་གོང་འཕེལ་དུ་གཏོང་བར་ཧ་ཅང་དགེ་མཚན་མཆིས་སོ། །",
        new String[] {
          "སྣོན", "མཛོད", "དང", "ལས", "འདིས", "བོད", "ཡིག", "མི", "ཉམས", "གོང", "འཕེལ", "དུ",
          "གཏོང", "བར", "ཧ", "ཅང", "དགེ", "མཚན", "མཆིས", "སོ"
        });
  }

  public void testOffsets() throws Exception {
    assertAnalyzesTo(
        a,
        "David has 5000 bones",
        new String[] {"David", "has", "5000", "bones"},
        new int[] {0, 6, 10, 15},
        new int[] {5, 9, 14, 20});
  }

  public void testTypes() throws Exception {
    assertAnalyzesTo(
        a,
        "David has 5000 bones",
        new String[] {"David", "has", "5000", "bones"},
        new String[] {"<ALPHANUM>", "<ALPHANUM>", "<NUM>", "<ALPHANUM>"});
  }

  public void testKorean() throws Exception {
    BaseTokenStreamTestCase.assertAnalyzesTo(
        a, "훈민정음", new String[] {"훈민정음"}, new String[] {"<HANGUL>"});
  }

  public void testJapanese() throws Exception {
    BaseTokenStreamTestCase.assertAnalyzesTo(
        a,
        "仮名遣い カタカナ",
        new String[] {"仮", "名", "遣", "い", "カタカナ"},
        new String[] {
          "<IDEOGRAPHIC>", "<IDEOGRAPHIC>", "<IDEOGRAPHIC>", "<HIRAGANA>", "<KATAKANA>"
        });
  }

  /** simple emoji */
  public void testEmoji() throws Exception {
    BaseTokenStreamTestCase.assertAnalyzesTo(
        a,
        "💩 💩💩",
        new String[] {"💩", "💩", "💩"},
        new String[] {"<EMOJI>", "<EMOJI>", "<EMOJI>"});
  }

  /** emoji zwj sequence */
  public void testEmojiSequence() throws Exception {
    BaseTokenStreamTestCase.assertAnalyzesTo(
        a, "👩‍❤️‍👩", new String[] {"👩‍❤️‍👩"}, new String[] {"<EMOJI>"});
  }

  /** emoji zwj sequence with fitzpatrick modifier */
  public void testEmojiSequenceWithModifier() throws Exception {
    BaseTokenStreamTestCase.assertAnalyzesTo(
        a, "👨🏼‍⚕️", new String[] {"👨🏼‍⚕️"}, new String[] {"<EMOJI>"});
  }

  /** regional indicator */
  public void testEmojiRegionalIndicator() throws Exception {
    BaseTokenStreamTestCase.assertAnalyzesTo(
        a, "🇺🇸🇺🇸", new String[] {"🇺🇸", "🇺🇸"}, new String[] {"<EMOJI>", "<EMOJI>"});
  }

  /** variation sequence */
  public void testEmojiVariationSequence() throws Exception {
    BaseTokenStreamTestCase.assertAnalyzesTo(
        a, "#️⃣", new String[] {"#️⃣"}, new String[] {"<EMOJI>"});
    BaseTokenStreamTestCase.assertAnalyzesTo(
        a,
        "3️⃣",
        new String[] {
          "3️⃣",
        },
        new String[] {"<EMOJI>"});
  }

  public void testEmojiTagSequence() throws Exception {
    BaseTokenStreamTestCase.assertAnalyzesTo(
        a, "🏴󠁧󠁢󠁥󠁮󠁧󠁿", new String[] {"🏴󠁧󠁢󠁥󠁮󠁧󠁿"}, new String[] {"<EMOJI>"});
  }

  public void testEmojiTokenization() throws Exception {
    // simple emoji around latin
    BaseTokenStreamTestCase.assertAnalyzesTo(
        a,
        "poo💩poo",
        new String[] {"poo", "💩", "poo"},
        new String[] {"<ALPHANUM>", "<EMOJI>", "<ALPHANUM>"});
    // simple emoji around non-latin
    BaseTokenStreamTestCase.assertAnalyzesTo(
        a,
        "💩中國💩",
        new String[] {"💩", "中", "國", "💩"},
        new String[] {"<EMOJI>", "<IDEOGRAPHIC>", "<IDEOGRAPHIC>", "<EMOJI>"});
  }

  public void testEmojiFromTheFuture() throws Exception {
    // pick an unassigned character with extended_pictographic
    int ch = new UnicodeSet("[[:Extended_Pictographic:]&[:Unassigned:]]").getRangeStart(0);
    String value = new String(Character.toChars(ch));
    // should analyze to emoji type
    BaseTokenStreamTestCase.assertAnalyzesTo(
        a, value, new String[] {value}, new String[] {"<EMOJI>"});
    // shouldn't break in a sequence
    BaseTokenStreamTestCase.assertAnalyzesTo(
        a,
        value + '\u200D' + value,
        new String[] {value + '\u200D' + value},
        new String[] {"<EMOJI>"});
  }

  /** blast some random strings through the analyzer */
  public void testRandomStrings() throws Exception {
    checkRandomData(random(), a, 200 * RANDOM_MULTIPLIER);
  }

  /** blast some random large strings through the analyzer */
  public void testRandomHugeStrings() throws Exception {
    Random random = random();
    checkRandomData(random, a, 10 * RANDOM_MULTIPLIER, 8192);
  }

  public void testTokenAttributes() throws Exception {
    try (TokenStream ts = a.tokenStream("dummy", "This is a test")) {
      ScriptAttribute scriptAtt = ts.addAttribute(ScriptAttribute.class);
      ts.reset();
      while (ts.incrementToken()) {
        assertEquals(UScript.LATIN, scriptAtt.getCode());
        assertEquals(UScript.getName(UScript.LATIN), scriptAtt.getName());
        assertEquals(UScript.getShortName(UScript.LATIN), scriptAtt.getShortName());
        assertTrue(ts.reflectAsString(false).contains("script=Latin"));
      }
      ts.end();
    }
  }

  /** test for bugs like http://bugs.icu-project.org/trac/ticket/10767 */
  public void testICUConcurrency() throws Exception {
    int numThreads = 8;
    final CountDownLatch startingGun = new CountDownLatch(1);
    Thread[] threads = new Thread[numThreads];
    for (int i = 0; i < threads.length; i++) {
      threads[i] =
          new Thread() {
            @Override
            public void run() {
              try {
                startingGun.await();
                long tokenCount = 0;
                final String contents = "英 เบียร์ ビール ເບຍ abc";
                for (int i = 0; i < 1000; i++) {
                  try (Tokenizer tokenizer = new ICUTokenizer()) {
                    tokenizer.setReader(new StringReader(contents));
                    tokenizer.reset();
                    while (tokenizer.incrementToken()) {
                      tokenCount++;
                    }
                    tokenizer.end();
                  }
                }
                if (VERBOSE) {
                  System.out.println(tokenCount);
                }
              } catch (Exception e) {
                throw new RuntimeException(e);
              }
            }
          };
      threads[i].start();
    }
    startingGun.countDown();
    for (int i = 0; i < threads.length; i++) {
      threads[i].join();
    }
  }

  /** test use of http://www.unicode.org/reports/tr24/#Script_Extensions */
  public void testScriptExtensions() throws Exception {
    assertAnalyzesTo(a, "𑅗०", new String[] {"𑅗०"});
  }

  /** don't change scripts for category Mc */
  public void testScriptSpacingMark() throws Exception {
    assertAnalyzesTo(a, "𑅗ा", new String[] {"𑅗ा"});
  }

  /** don't change scripts for category Me */
  public void testScriptEnclosingMark() throws Exception {
    assertAnalyzesTo(a, "𑅗᪾", new String[] {"𑅗᪾"});
  }
}
