using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Windsor.Commons.Core;
using System.IO;
using System.Text;

namespace Sleis.Utility
{
    public class SleisCsvParser : CommaSeparatedFileParser
    {
        public SleisCsvParser(Stream stream)
            : base(stream) {   }
        public SleisCsvParser(TextReader reader)
            : base(reader) {  }
        public SleisCsvParser(string path)
            : base(path) {  }
        public SleisCsvParser(Stream stream, Encoding defaultEncoding)
            : base(stream, defaultEncoding) {  }
        public SleisCsvParser(string path, Encoding defaultEncoding)
            : base(path, defaultEncoding) {  }
        public SleisCsvParser(Stream stream, Encoding defaultEncoding, bool detectEncoding)
            : base(stream, defaultEncoding, detectEncoding) {  }
        public SleisCsvParser(string path, Encoding defaultEncoding, bool detectEncoding)
            : base(path, defaultEncoding, detectEncoding) {  }
        public SleisCsvParser(Stream stream, Encoding defaultEncoding, bool detectEncoding, bool leaveOpen)
            : base(stream, defaultEncoding, detectEncoding, leaveOpen) {  }
        
        /// <summary>
        /// Gets Value by column name.  This will allow for nullable types.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="columnName"></param>
        /// <returns>Value</returns>        
        public override T GetValue<T>(string columnName)
        {
            string strValue = GetColumnString(columnName);
            if (string.IsNullOrEmpty(strValue))
            {
                return default(T);
            }
            else
            {
                return ChangeType<T>(strValue);
            }
        }
        protected override T ChangeType<T>(string strValue)
        {
            if (typeof(T).IsEnum)
            {
                return (T)Enum.Parse(typeof(T), strValue);
            }
            else
            {
                return strValue.ConvertTo<T>();
                //return (T)Convert.ChangeType(strValue, typeof(T));
            }
        }
    }
}