using LCU.Library.Internal.CoreApiWrapperModel.CoreModels.Transaction;
using LCU.Library.Internal.CoreApiWrapperModel.CoreModels.CoreRequests;
using ReserveManagementSystemLib.Models;

namespace ReserveManagementSystemApi.Mappers
{
    public static class ExportMapper
    {
        //used for Chargeback transactions
        private const string GeneralLedgerReceipt = "GLR";  
        private const string DealerInterestRebate = "DRIR";
        private const string ChargeBkDesc = "ChrgBk";
        private const string ChargeBkAdjDesc = "ChrgBk Adj";
        private const string GeneralLedgerCategory = "NOTE";
        private const string GeneralLedgerType = "BAL";
        
        //used for Reserve transactions
        private const string DealerExpense = "DLRE";  
        private const string DealerIncome = "DLRI";
        private const string ReserveAdjDesc = "Adjustment";
        
        //used for all transaction types
        private const string UpfrontCategory = "UPFR";
        private const string DealerType = "DLR";
        private const string ElectronicFundType = "EL";
        private const string NoHoldClearCategory = "IMED";
        private const string FundTypeDetail = "INTR";

        public static GroupedMonetaryTransactionRequest MapLoanToIndirectLoanForReserve(Loan loan) 
        {
            return new GroupedMonetaryTransactionRequest 
            {
                MonetaryTransactionRequests = BuildReserveTransactions(loan), 
                ParentRequestNumber = loan.LoanNumber
            };
        }

        private static List<MonetaryTransactionRequest> BuildReserveTransactions(Loan loan)
        {
            var listTransaction = new List<MonetaryTransactionRequest>();
            var isAdjustment = loan.Adjustment != null && loan.Adjustment != 0;

            var reserveRounded = Math.Round(loan.ReserveAmount, 4, MidpointRounding.AwayFromZero); //this represents the amount saved to DB
            var amount = isAdjustment ? Math.Round((decimal)loan.Adjustment, 2, MidpointRounding.AwayFromZero) : Math.Round(reserveRounded, 2, MidpointRounding.AwayFromZero);
            var transactionDescription = isAdjustment ? ReserveAdjDesc : null;

            var loanAmount = (double)amount * -1;
            listTransaction.Add(BuildParentTransaction(loanAmount, loan.LoanNumber, DealerExpense, transactionDescription));

            var dealerAmount = (double)amount;
            listTransaction.Add(BuildDealerTransaction(dealerAmount, loan.Dealer.DealerAccountNumber, DealerIncome, transactionDescription));

            return listTransaction;
        }

        public static GroupedMonetaryTransactionRequest MapLoanToIndirectLoanForChargeback(Loan loan, MinorAccountType accountType) 
        {
            var request = new GroupedMonetaryTransactionRequest();
            if (accountType != null) {
                request.MonetaryTransactionRequests = BuildChargebackTransactions(loan, accountType.GeneralLedgerAccountNumber);
                request.ParentRequestNumber = loan.LoanNumber;
            }

            return request;
        }

        private static List<MonetaryTransactionRequest> BuildChargebackTransactions(Loan loan, string accountNumber)
        {
            var listTransaction = new List<MonetaryTransactionRequest>();
            _balanceTypeList = new List<BalanceType1>();
            _fundList = new List<Fund>();
            _fundBalanceTypeList = new List<FundBalanceType>();

            var isAdjustment = loan.Adjustment != null && loan.Adjustment != 0;

            var chargeBackRounded = Math.Round((decimal)loan.ChargeBack, 4, MidpointRounding.AwayFromZero); //this represents the amount saved to DB
            var amount = isAdjustment ? Math.Round((decimal)loan.Adjustment, 2, MidpointRounding.AwayFromZero) : Math.Round(chargeBackRounded, 2, MidpointRounding.AwayFromZero);
            var transactionDescription = isAdjustment ? $"{ChargeBkAdjDesc}-{loan.LoanNumber}"  : $"{ChargeBkDesc}-{loan.LoanNumber}";

            var loanAmount = (double)amount;
            listTransaction.Add(BuildParentTransaction(loanAmount, accountNumber, GeneralLedgerReceipt, transactionDescription));

            var dealerAmount = (double)amount * -1;
            listTransaction.Add(BuildDealerTransaction(dealerAmount, loan.Dealer.DealerAccountNumber, DealerInterestRebate, transactionDescription));

            return listTransaction;
        }

        private static MonetaryTransactionRequest BuildParentTransaction(double amount, string accountNumber, string transactionType, string transactionDescription)
        {
            //if a reserve the parent transaction contains the loan number, if chargeback the account is the ledger account for minor account type
            _balanceTypeList = new List<BalanceType1>();
            _fundList = new List<Fund>();
            _fundBalanceTypeList = new List<FundBalanceType>();

            _balanceTypeList.Add(BuildBalanceType(amount, transactionType));     
            _fundList.Add(BuildFund(amount));
            _fundBalanceTypeList.Add(BuildFundBalanceType(amount));

            var transaction = new MonetaryTransactionRequest()
            {
                AccountNumber = (long)System.Convert.ToUInt64(accountNumber),
                TransactionAmount = (transactionType != GeneralLedgerReceipt) ? amount : (double?)null, 
                RequestNumber = "1",
                ParentRequestNumber = null,
                TransactionTypeCode = transactionType,
                Description = transactionDescription,
                BalanceTypes = _balanceTypeList,
                Funds = _fundList,
                FundBalanceTypes = (transactionType == GeneralLedgerReceipt) ? _fundBalanceTypeList : null,
            };

            return transaction;
        }

        private static MonetaryTransactionRequest BuildDealerTransaction(double amount, string dealerAccount, string transactionType, string transactionDescription)
        {
            //for second request take the offset amount value of parent request amount
            _balanceTypeList = new List<BalanceType1>();
            _fundList = new List<Fund>();
            _fundBalanceTypeList = new List<FundBalanceType>();

            _balanceTypeList.Add(BuildBalanceType(amount, transactionType));
            _fundList.Add(BuildFund(amount));
            _fundBalanceTypeList.Add(BuildFundBalanceType(amount));

            var transaction = new MonetaryTransactionRequest()
            {
                AccountNumber = (string.IsNullOrEmpty(dealerAccount) == true) ? 0 : (long)System.Convert.ToUInt64(dealerAccount),
                TransactionAmount = amount,
                RequestNumber = "2",
                ParentRequestNumber = "1",
                TransactionTypeCode = transactionType,
                Description = transactionDescription, 
                BalanceTypes = _balanceTypeList,
                Funds = _fundList,
            };

            return transaction;
        }

        private static List<FundBalanceType> _fundBalanceTypeList;
        private static FundBalanceType BuildFundBalanceType(double amount)
        {
            return new FundBalanceType
            {
                FundBalanceAmount = amount,
                FundTypeCode = ElectronicFundType,
                FundTypeDetailCode = NoHoldClearCategory
            };
        }
       
        private static List<BalanceType1> _balanceTypeList;
        private static BalanceType1 BuildBalanceType(double amount, string transactionType) 
        {
            return new BalanceType1
            {
                BalanceTypeAmount = amount,  
                BalanceCategoryCode = (transactionType == GeneralLedgerReceipt) ? GeneralLedgerCategory  : UpfrontCategory, 
                BalanceTypeCode = (transactionType == GeneralLedgerReceipt) ? GeneralLedgerType  : DealerType,
            };
        }

        private static List<Fund> _fundList;
        private static Fund BuildFund(double amount)  
        {
            return new Fund
            {
                ClearingCategoryCode = NoHoldClearCategory,
                FundAmount = amount,
                FundTypeCode = ElectronicFundType,
                FundTypeDetailCode = FundTypeDetail,
                NumberOfItems = 1,
            };
        }

    }
}