/*
 * 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.
 */

using System;

using NUnit.Framework;

using IndexInput = Lucene.Net.Store.IndexInput;

namespace Lucene.Net.Index
{
	[TestFixture]
	public class TestIndexInput
	{
		[Test]
        public virtual void  TestRead()
		{
			IndexInput is_Renamed = new MockIndexInput(new byte[]{(byte) (0x80), (byte) (0x01), (byte) (0xFF), (byte) (0x7F), (byte) (0x80), (byte) (0x80), (byte) (0x01), (byte) (0x81), (byte) (0x80), (byte) (0x01), (byte) (0x06), (byte) 'L', (byte) 'u', (byte) 'c', (byte) 'e', (byte) 'n', (byte) 'e'});
			Assert.AreEqual(128, is_Renamed.ReadVInt());
			Assert.AreEqual(16383, is_Renamed.ReadVInt());
			Assert.AreEqual(16384, is_Renamed.ReadVInt());
			Assert.AreEqual(16385, is_Renamed.ReadVInt());
			Assert.AreEqual("Lucene", is_Renamed.ReadString());
		}
		
        /// <summary> Expert
        /// 
        /// </summary>
        /// <throws>  IOException </throws>
        [Test]
        public virtual void  TestSkipChars()
        {
            byte[] bytes = new byte[]{(byte) 0x80, (byte) 0x01, (byte) 0xFF, (byte) 0x7F, (byte) 0x80, (byte) 0x80, (byte) 0x01, (byte) 0x81, (byte) 0x80, (byte) 0x01, (byte) 0x06, (byte) 'L', (byte) 'u', (byte) 'c', (byte) 'e', (byte) 'n', (byte) 'e'};
            System.String utf8Str = "\u0634\u1ea1";
            byte[] utf8Bytes = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(utf8Str);
            byte[] theBytes = new byte[bytes.Length + 1 + utf8Bytes.Length];
            Array.Copy(bytes, 0, theBytes, 0, bytes.Length);
            theBytes[bytes.Length] = (byte) utf8Str.Length; //Add in the number of chars we are storing, which should fit in a byte for this test 
            Array.Copy(utf8Bytes, 0, theBytes, bytes.Length + 1, utf8Bytes.Length);
            IndexInput is_Renamed = new MockIndexInput(theBytes);
            Assert.AreEqual(128, is_Renamed.ReadVInt());
            Assert.AreEqual(16383, is_Renamed.ReadVInt());
            Assert.AreEqual(16384, is_Renamed.ReadVInt());
            Assert.AreEqual(16385, is_Renamed.ReadVInt());
            int charsToRead = is_Renamed.ReadVInt(); //number of chars in the Lucene string
            Assert.IsTrue(0x06 == charsToRead, 0x06 + " does not equal: " + charsToRead);
            is_Renamed.SkipChars(3);
            char[] chars = new char[3]; //there should be 6 chars remaining
            is_Renamed.ReadChars(chars, 0, 3);
            System.String tmpStr = new System.String(chars);
            Assert.IsTrue(tmpStr.Equals("ene") == true, tmpStr + " is not equal to " + "ene");
            //Now read the UTF8 stuff
            charsToRead = is_Renamed.ReadVInt() - 1; //since we are skipping one
            is_Renamed.SkipChars(1);
            Assert.IsTrue(utf8Str.Length - 1 == charsToRead, utf8Str.Length - 1 + " does not equal: " + charsToRead);
            chars = new char[charsToRead];
            is_Renamed.ReadChars(chars, 0, charsToRead);
            tmpStr = new System.String(chars);
            Assert.IsTrue(tmpStr.Equals(utf8Str.Substring(1)) == true, tmpStr + " is not equal to " + utf8Str.Substring(1));
        }
    }
}