using NFC.Mifare_DESFire.Enums;
using PCSC.Iso7816;
using System;
using System.Collections.Generic;
using System.Text;

namespace NFC.Mifare_DESFire
{
    public class MifareDESFire
    {
        private ICard _Card;

        public MifareDESFire(ICard card)
        {
            _Card = card;
        }

        /// <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();
        }

        public void Format()
        {
            throw new NotImplementedException();
        }

        public void Authenticate(int v, byte[] aPP_MasterKey)
        {
            throw new NotImplementedException();
        }

        /// <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;
        }

        public void ChangeApplicationMasterKey(byte[] aPP_MasterKey)
        {
            throw new NotImplementedException();
        }

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

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

            return cmd;
        }

        public void ChangeApplicationKey(int v, byte[] aPP_Key_1)
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// Select Application by ID
        /// </summary>
        /// <param name="id">3 Byte ID</param>
        public APDUCommand CreateApplication(UInt32 id, byte keysetting1, byte keysetting2)
        {
            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],
                    keysetting1,
                    keysetting2
                },
                Le = 0x00
            };

            return cmd;
        }

        public void CreateFile(byte fabAccessIdentFileID, FileCommunication pLAIN, ushort fileAccessRight, int v)
        {
            throw new NotImplementedException();
        }

        public ushort GenerateFileAccessRight(AccessRights fREE, int v1, int v2, int v3)
        {
            throw new NotImplementedException();
        }

        public void WirteData(byte fabAccessIdentFileID, int v1, int v2, byte[] vs)
        {
            throw new NotImplementedException();
        }

        public void CreateFile(byte fabAccessIdentFileID, object plain, AccessRights fREE, int v1, int v2, int v3)
        {
            throw new NotImplementedException();
        }

        public byte[] ReadData(byte identFileID, int v1, int v2)
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// Genearte KeySetting1 for Application Settings or PICC Setting
        /// </summary>
        public byte GenerateKeySetting1(ChangeApplicationKey changeKey, ChangeMasterKeySettings changeMasterKeySettings, CreateDeleteFile createDeleteFile, FileDirectoryAccess fileDirectoryAccess, ChangeMasterKey changeMasterKey)
        {
            return (byte)(((byte)changeKey << 4) | (byte)changeMasterKeySettings | (byte)createDeleteFile | (byte)fileDirectoryAccess | (byte)changeMasterKey);
        }

        /// <summary>
        /// Genearte KeySetting1 for Application Settings or PICC Setting
        /// </summary>
        /// <param name="changeKey">ID of Key for changing Application Keys</param>
        /// <returns></returns>
        public byte GenerateKeySetting1(byte changeKey, ChangeMasterKeySettings changeMasterKeySettings, CreateDeleteFile createDeleteFile, FileDirectoryAccess fileDirectoryAccess, ChangeMasterKey changeMasterKey)
        {
            if(changeKey < 0x01 || changeKey >= 0x0E)
            {
                throw new ArgumentOutOfRangeException();
            }
            return GenerateKeySetting1(changeKey, changeMasterKeySettings, createDeleteFile, fileDirectoryAccess, changeMasterKey);
        }

        /// <summary>
        /// Genearte KeySetting2 for Application Creation
        /// </summary>
        /// <param name="numberOfKeys">Number of keys that can be stored within the application (0x01-0x0D)</param>
        /// <returns></returns>
        public byte GenerateKeySetting2(CryptoOperationsType cryptoOperations, FileIdentifies fileIdentifies, byte numberOfKeys)
        {
            if(numberOfKeys < 0x01 || numberOfKeys >= 0x0D)
            {
                throw new ArgumentOutOfRangeException();
            }

            return (byte)((byte)cryptoOperations | (byte)fileIdentifies | numberOfKeys);
        }
    }
}