/*
 * 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;


namespace Apache.NMS.MSMQ
{
	public class TextMessage : BaseMessage, ITextMessage
	{
		public const int SIZE_OF_INT = 4; // sizeof(int) - though causes unsafe issues with net 1.1

		private String text;

		public TextMessage()
		{
		}

		public TextMessage(String text)
		{
			this.Text = text;
		}


		// Properties

		public string Text
		{
			get
			{
				if(text == null)
				{
					// now lets read the content
					byte[] data = this.Content;
					if(data != null)
					{
						// TODO assume that the text is ASCII
						char[] chars = new char[data.Length - SIZE_OF_INT];
						for(int i = 0; i < chars.Length; i++)
						{
							chars[i] = (char) data[i + SIZE_OF_INT];
						}
						text = new String(chars);
					}
				}
				return text;
			}

			set
			{
				this.text = value;
				byte[] data = null;
				if(text != null)
				{
					// TODO assume that the text is ASCII

					byte[] sizePrefix = System.BitConverter.GetBytes(text.Length);
					data = new byte[text.Length + sizePrefix.Length];  //int at the front of it

					// add the size prefix
					for(int j = 0; j < sizePrefix.Length; j++)
					{
						// The bytes need to be encoded in big endian
						if(BitConverter.IsLittleEndian)
						{
							data[j] = sizePrefix[sizePrefix.Length - j - 1];
						}
						else
						{
							data[j] = sizePrefix[j];
						}
					}

					// Add the data.
					char[] chars = text.ToCharArray();
					for(int i = 0; i < chars.Length; i++)
					{
						data[i + sizePrefix.Length] = (byte) chars[i];
					}
				}
				this.Content = data;

			}
		}

	}
}