using System;
using System.Linq;
using System.IO;
using System.Text;
using System.Collections.Generic;

namespace AniNIX.Crypto {
    public class Ubchi : Cipher { 

        public override String Description() { return "The Ubchi cipher\nThis is a regular double-transposition cipher -- it will add some garbage to the end of your string.\nKey format is any word to use for the transposition.\nNOTE: This does not completely match Rumkin, whose implementation is a little flawed."; }
        public override String Command() { return "ubchi"; }

        public Ubchi(Workbench w) : base (w) {}

        private ColumnTransposition col = new ColumnTransposition();

        /// <summary>
        /// Encrypt a string with the cipher
        /// </summary>
        /// <param name="workSpace">The working copy of the cipher</param>
        /// <param name="inputText">The original cipher</param>
        /// <param name="line">The user input</param>
        /// <returns>The encrypted string</returns>
        public override String Encrypt(String workSpace,String inputText,String[] line) {
            if (line == null || line.Length != 3) { 
                Console.Error.WriteLine("Malformed!");
                return workSpace;
            }
            // Pad the incoming workspace
            String changed = CharGrid.RandPad(workSpace,line[2].Length);
            // Transpose twice.
            changed = col.Encrypt(changed,inputText,line);
            changed = col.Encrypt(changed,inputText,line);           
            return changed;
        }

        /// <summary>
        /// Decrypt a string with the cipher
        /// </summary>
        /// <param name="workSpace">The working copy of the cipher</param>
        /// <param name="inputText">The original cipher</param>
        /// <param name="line">The user input</param>
        /// <returns>The encrypted string</returns>
        public override String Decrypt(String workSpace,String inputText,String[] line) {
            if (line == null || line.Length != 3) { 
                Console.Error.WriteLine("Malformed!");
                return workSpace;
            }
            // De-transpose twice. Without encrypting a number, we don't have a way to programmatically trim.
            String changed = col.Decrypt(workSpace,inputText,line);
            changed = col.Decrypt(changed,inputText,line);
            return changed;
        }

    }
}