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using System;

namespace LumiSoft.Net.Mime
{
	/// <summary>
	/// Mime entity header field.
	/// </summary>
	public class HeaderField
	{
		private string m_Name  = "";
		private string m_Value = "";

		/// <summary>
		/// Default construtor.
		/// </summary>
		public HeaderField()
		{			
		}

		/// <summary>
		/// Creates new header field with specified name and value.
		/// </summary>
		/// <param name="name">Header field name. Header field name must end with colon(:) and may contain US-ASCII character values between 33 and 126.</param>
		/// <param name="value">Header field value.</param>
		public HeaderField(string name,string value)
		{
			this.Name  = name;
			this.Value = value;
		}


		#region Properties Implementation

		/// <summary>
		/// Gets or sets header field name. Header field name must end with colon(:) and may contain US-ASCII character values between 33 and 126.
		/// </summary>
		public string Name
		{
			get{ return m_Name; }

			set{ 
				/* RFC 2822 2.2 Header Fields
					Header fields are lines composed of a field name, followed by a colon
					(":"), followed by a field body, and terminated by CRLF.  A field
					name MUST be composed of printable US-ASCII characters (i.e.,
					characters that have values between 33 and 126, inclusive), except
					colon.  A field body may be composed of any US-ASCII characters,
					except for CR and LF.  However, a field body may contain CRLF when
					used in header "folding" and  "unfolding" as described in section
					2.2.3.  All field bodies MUST conform to the syntax described in
					sections 3 and 4 of this standard.
				*/

				if(value == ""){
					throw new Exception("Header Field name can't be empty !");
				}
				
				// Colon is missing from name, just add it
				if(!value.EndsWith(":")){
					value += ":";
				}

				// Check if name is between ASCII 33 - 126 characters
				foreach(char c in value.Substring(0,value.Length - 1)){
					if(c < 33 || c > 126){
						throw new Exception("Invalid field name '" + value + "'. A field name MUST be composed of printable US-ASCII characters (i.e.,characters that have values between 33 and 126, inclusive),except	colon.");
					}
				}

				m_Name = value; 
			}
		}

		/// <summary>
		/// Gets or sets header field value.
		/// </summary>
		public string Value
		{
			get{ return Core.CanonicalDecode(m_Value); }

			set{ m_Value = Core.CanonicalEncode(value,"utf-8"); }
		}

        /// <summary>
        /// Gets header field encoded value.
        /// </summary>
        internal string EncodedValue
        {
            get{ return m_Value; }
        }

		#endregion

	}
}