using Lucene.Net.Analysis.Core;
using NUnit.Framework;
using System.IO;

namespace Lucene.Net.Analysis.Tr
{
    /*
	 * 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.
	 */

    /// <summary>
    /// Test the Turkish lowercase filter.
    /// </summary>
    public class TestTurkishLowerCaseFilter_ : BaseTokenStreamTestCase
    {

        /// <summary>
        /// Test composed forms
        /// </summary>
        [Test]
        public virtual void TestTurkishLowerCaseFilter()
        {
            TokenStream stream = new MockTokenizer(new StringReader("\u0130STANBUL \u0130ZM\u0130R ISPARTA"), MockTokenizer.WHITESPACE, false);
            TurkishLowerCaseFilter filter = new TurkishLowerCaseFilter(stream);
            AssertTokenStreamContents(filter, new string[] { "istanbul", "izmir", "\u0131sparta" });
        }

        /// <summary>
        /// Test decomposed forms
        /// </summary>
        [Test]
        public virtual void TestDecomposed()
        {
            TokenStream stream = new MockTokenizer(new StringReader("\u0049\u0307STANBUL \u0049\u0307ZM\u0049\u0307R ISPARTA"), MockTokenizer.WHITESPACE, false);
            TurkishLowerCaseFilter filter = new TurkishLowerCaseFilter(stream);
            AssertTokenStreamContents(filter, new string[] { "istanbul", "izmir", "\u0131sparta" });
        }

        /// <summary>
        /// Test decomposed forms with additional accents
        /// In this example, U+0049 + U+0316 + U+0307 is canonically equivalent
        /// to U+0130 + U+0316, and is lowercased the same way.
        /// </summary>
        [Test]
        public virtual void TestDecomposed2()
        {
            TokenStream stream = new MockTokenizer(new StringReader("\u0049\u0316\u0307STANBUL \u0049\u0307ZM\u0049\u0307R I\u0316SPARTA"), MockTokenizer.WHITESPACE, false);
            TurkishLowerCaseFilter filter = new TurkishLowerCaseFilter(stream);
            AssertTokenStreamContents(filter, new string[] { "i\u0316stanbul", "izmir", "\u0131\u0316sparta" });
        }

        [Test]
        public virtual void TestDecomposed3()
        {
            TokenStream stream = new MockTokenizer(new StringReader("\u0049\u0307"), MockTokenizer.WHITESPACE, false);
            TurkishLowerCaseFilter filter = new TurkishLowerCaseFilter(stream);
            AssertTokenStreamContents(filter, new string[] { "i" });
        }

        [Test]
        public virtual void TestEmptyTerm()
        {
            Analyzer a = new AnalyzerAnonymousInnerClassHelper(this);
            CheckOneTerm(a, "", "");
        }

        private class AnalyzerAnonymousInnerClassHelper : Analyzer
        {
            private readonly TestTurkishLowerCaseFilter_ outerInstance;

            public AnalyzerAnonymousInnerClassHelper(TestTurkishLowerCaseFilter_ outerInstance)
            {
                this.outerInstance = outerInstance;
            }

            protected override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
            {
                Tokenizer tokenizer = new KeywordTokenizer(reader);
                return new TokenStreamComponents(tokenizer, new TurkishLowerCaseFilter(tokenizer));
            }
        }
    }
}