using System.IO;

namespace ComposableDecorators
{
    public class Program
    {
        static void Main(string[] args)
        {
            //how to use
            Csv finalCsv = new CsvMassaged(
                new CsvDeduped(
                    new CsvText("file location")
                    )
                );
        }
    }

    public interface Csv
    {
        string Read();
    }

    public class CsvText : Csv
    {
        private readonly string _file;

        public CsvText(string file)
        {
            _file = file;
        }

        public string Read()
        {
            return File.ReadAllBytes(_file).ToString();
        }
    }

    public class CsvDeduped : Csv
    {
        private readonly Csv _origin;

        public CsvDeduped(Csv csv)
        {
            _origin = csv;
        }
        public string Read()
        {
            return Dedupe(_origin.Read());
        }

        private string Dedupe(string originText)
        {
            //deduplication logic
            return originText;
        }
    }

    public class CsvMassaged : Csv
    {
        private readonly Csv _origin;

        public CsvMassaged(Csv csv)
        {
            _origin = csv;
        }
        public string Read()
        {
            return Massage(_origin.Read());
        }

        private string Massage(string originText)
        {
            //massage logic
            return originText;
        }
    }
}