using System;
using System.Collections;
using System.Text;
using System.Threading;
using sscs.verbs;
using sscs.common;
using sscs.cache;
using sscs.constants;

namespace sscs.verbs 
{
    
   /*
    * This class is implementation of AddKeyChain call.
    * There will be one instance existing for every call made by the client.  
    */

    internal class AddKeyChain : SSVerb
    {

        private ushort msgId       = 0;
        private uint inMsgLen      = 0;
        private uint keyChainFlags = 0;
        private uint keyChainIdLen = 0;
        private string keyChainId;
        private uint outMsgLen     = 0;
        private byte[] inBuf;
        private byte[] outBuf;
        private int retCode        = 0;
        
        /*
        * This method sets the class member with the byte array received.
        */
 
        public void SetMessageContent(byte[] ipcBytes)
        {
           CSSSLogger.ExecutionTrace(this);
           inBuf = ipcBytes;                   
        }

       /*
        * This method does the actual implementation of AddKeyChain 
        */

        public byte[] ProcessRequest(UserIdentifier userId)
        {

            /* If an exception occurs in message format decoding,
             * it is handled by AppHandler
             */
            CSSSLogger.ExecutionTrace(this);
            
            // Message Format decipher - Start
            msgId          = BitConverter.ToUInt16(inBuf,0);
            inMsgLen       = BitConverter.ToUInt32(inBuf,2);
            if( inMsgLen != inBuf.Length )
                throw new FormatException(" MsgLen sent does not match the length of the message received."); 

            keyChainFlags  = BitConverter.ToUInt32(inBuf,6);
            keyChainIdLen  = BitConverter.ToUInt32(inBuf,10);
            byte[] tempArr = new byte[keyChainIdLen];
            Array.Copy(inBuf,14,tempArr,0,keyChainIdLen);
            keyChainId = Encoding.UTF8.GetString(tempArr);
            // Message Format decipher - End
 
            try
            {    
                SecretStore ssStore = null;
                KeyChain keyChain = null;
                keyChain = new KeyChain(keyChainId);

                ssStore = SessionManager.GetUserSecretStore(userId);
                if( ssStore.CheckIfKeyChainExists(keyChainId) == false )
                {
                    ssStore.AddKeyChain(keyChain);
                }
                else
                {
                    CSSSLogger.DbgLog("In " + CSSSLogger.GetExecutionPath(this) + " Keychain already present for keychain id " +keyChainId );
                    retCode = IPCRetCodes.SSCS_E_KEYCHAIN_ALREADY_EXISTS;
                }
            }     
            catch(UserNotInSessionException)
            {
                CSSSLogger.DbgLog("In " + CSSSLogger.GetExecutionPath(this) + " Unable to get user's secretstore" );
                retCode = IPCRetCodes.SSCS_E_SYSTEM_ERROR;
            }
            catch(Exception e) 
            {
                CSSSLogger.ExpLog(e.ToString());
                retCode = IPCRetCodes.SSCS_E_SYSTEM_ERROR;
            }
                
            try
            {
                msgId = 5;
                outMsgLen = 10;
                outBuf = new byte[10];
                byte[] t = new byte[10];

                t = BitConverter.GetBytes((ushort)msgId);
                Array.Copy(t,0,outBuf,0,2);

                t = BitConverter.GetBytes((uint)outMsgLen);
                Array.Copy(t,0,outBuf,2,4);

                t = BitConverter.GetBytes(retCode);
                Array.Copy(t,0,outBuf,6,4);
            }
            catch(Exception e)
            {
                CSSSLogger.ExpLog(e.ToString());
                throw new FormatException("Unable to form the response " + e.ToString());
            }
            return outBuf;

        }

        /*
         * Gives the name of operation performed. Will be used in case 
         * of error. 
         */
        public string GetVerbName()
        {
            CSSSLogger.ExecutionTrace(this);
            return (this.ToString()); 
        }
    }
}