using PCSC.Iso7816;
using System;
using System.Collections.Generic;
using System.Text;

namespace NFC.Mifare_DESFire
{
    public class MifareDESFire
    {
        /// <summary>
        /// Create new Application with AID
        /// </summary>
        /// <param name="aid">Appilication ID</param>
        public APDUCommand CreateApplication(UInt64 aid)
        {
            throw new NotImplementedException();
        }

        public APDUCommand GetApplicationIDs()
        {
            APDUCommand cmd = new APDUCommand(IsoCase.Case2Short)
            {
                CLA = 0x90,
                INS = (byte)APDUInstructions.GET_APPLICATION_IDS
            };

            return cmd;
        }

        public UInt32[] ConvertApplicationIDs(APDUResponse response)
        {
            if(response.Body.Length % 3 != 0)
            {
                throw new Exception("Invalid Body Length.");
            }

            List<UInt32> applicationIDs = new List<UInt32>();

            for(int i = 0; i < response.Body.Length; i += 3)
            {
                UInt32 new_applicationID = 0;
                new_applicationID = (UInt32)((response.Body[i] << 16) + (response.Body[i + 1] << 8) + response.Body[i + 2]);
                applicationIDs.Add(new_applicationID);
            }

            return applicationIDs.ToArray();
        }

        /// <summary>
        /// Select Application by ID
        /// </summary>
        /// <param name="id">3 Byte ID</param>
        public APDUCommand SelectApplication(UInt32 id)
        {
            byte[] id_byte = BitConverter.GetBytes(id);

            APDUCommand cmd = new APDUCommand(IsoCase.Case4Short)
            {
                CLA = 0x90,
                INS = (byte)APDUInstructions.SELECT_APPLICATION,
                Data = new byte[]
                {
                    id_byte[0],
                    id_byte[1],
                    id_byte[2]
                },
                Le = 0x00
            };

            return cmd;
        }

        /// <summary>
        /// Select Application by ID
        /// </summary>
        /// <param name="id">3 Byte ID</param>
        public APDUCommand CreateApplication(UInt32 id)
        {
            byte[] id_byte = BitConverter.GetBytes(id);

            APDUCommand cmd = new APDUCommand(IsoCase.Case4Short)
            {
                CLA = 0x90,
                INS = (byte)APDUInstructions.CREATE_APPLICATION,
                Data = new byte[]
                {
                    id_byte[0],
                    id_byte[1],
                    id_byte[2]
                },
                Le = 0x00
            };

            return cmd;
        }

        public byte GenerateKeySetting1()
        {
            return 0x00;
        }

        /// <summary>
        /// 
        /// </summary>
        public enum ChangeKey : byte
        {
            MASTERKEY = 0x00,
            
        }
    }
}