using LCU.Library.Internal.CoreApiWrapperModel.CoreModels.CoreRequests;
using LCU.Library.Internal.CoreApiWrapperModel.CoreModels.Transaction;
using ReserveManagementSystemApi.Mappers;
using ReserveManagementSystemApi.Helpers;
using ReserveManagementSystemApi.Models;
using ReserveManagementSystemApi.ServiceClients;
using ReserveManagementSystemLib.Models;
using ReserveManagementSystemLib.Repositories;
using ReserveManagementSystemLib.Configuration;

namespace ReserveManagementSystemApi.Services
{
    public class ExportService: IExportService
    {
        private readonly ILoanRepository _loanRepository;
        private readonly ICoreApiServiceClient _coreApiServiceClient;
        private readonly IMinorAccountTypeRepository _minorAccountTypeRepository;
        private readonly RmsApiConfiguration _rmsApiConfig;

        public ExportService(ILoanRepository loanRepository, ICoreApiServiceClient coreApiServiceClient, IMinorAccountTypeRepository minorAccountTypeRepository, RmsApiConfiguration rmsApiConfig)
        {
            _loanRepository = loanRepository;
            _coreApiServiceClient = coreApiServiceClient;
            _minorAccountTypeRepository = minorAccountTypeRepository;
            _rmsApiConfig = rmsApiConfig;
        }

        public async Task<int> ExportReservesAsync(DateTime currentDate)
        {
            var numberOfLoansUpdated = 0;
            try
            {
                var loansToUpdate = await _loanRepository.GetAll().Where(l => l.ExportedReserveDate == null).ToListAsync();
                var groupedLoanRequests = loansToUpdate.Select(ExportMapper.MapLoanToIndirectLoanForReserve).ToList();
                var exportResult = await SendBatchListMonetaryTransactionRequests(groupedLoanRequests);

                if (exportResult != null || exportResult.Any())
                {
                    var loansExported = new List<Loan>();

                    loansToUpdate.ForEach(loan =>
                        {
                            var validLoan = exportResult.Where(e => e.AccountNumber.ToString() == loan.LoanNumber).FirstOrDefault();
                            if (validLoan != null && validLoan.WasSuccessful)
                            {
                                loan.ExportedReserveDate = currentDate;
                                numberOfLoansUpdated += 1;
                                loan.Adjustment = 0;
                                loansExported.Add(loan); //update successful loan export with exported date
                            }
                            else
                            {
                                Log.Error($"Failure to export loan reserve account number: {loan.LoanNumber}");
                            }
                        });

                    await _loanRepository.UpdateAsync(loansExported);
                    Log.Information($"Exported {numberOfLoansUpdated} reserves");
                }
            }

            catch (Exception ex)
            {
                Log.Error(ex, "Failure exporting loan reserves.");
                throw;
            }

            return numberOfLoansUpdated;
        }

        public async Task<int> ExportChargebacksAsync(DateTime currentDate)
        {
            var numberOfLoansUpdated = 0;
            try
            {
                var loansToUpdate = await _loanRepository.GetAll().Where(l => l.ExportedChargebackDate == null && l.PaidLoanDate != null).ToListAsync();
                var groupedLoanRequests = new List<GroupedMonetaryTransactionRequest>();
                loansToUpdate.ForEach(loan =>
                    {
                        var accountType = GetMinorAccountType(loan.AccountType);
                        groupedLoanRequests.Add(ExportMapper.MapLoanToIndirectLoanForChargeback(loan, accountType));
                    }
                );

                var exportResult = await SendBatchListMonetaryTransactionRequests(groupedLoanRequests);

                if (exportResult != null || exportResult.Any())
                {
                    var loansExported = new List<Loan>();
                    loansToUpdate.ForEach(loan =>
                    {
                        var accountType = GetMinorAccountType(loan.AccountType);
                        var validLoan = exportResult.Where(e => e.AccountNumber.ToString() == accountType.GeneralLedgerAccountNumber).FirstOrDefault();
                        if (validLoan != null && validLoan.WasSuccessful)
                        {
                            loan.ExportedChargebackDate = currentDate;
                            numberOfLoansUpdated += 1;
                            loan.Adjustment = 0;
                            loansExported.Add(loan); //update successful loan export with exported date
                        }
                        else
                        {
                            Log.Error($"Failure to export loan reserve account number: {loan.LoanNumber}");
                        }
                    });

                    await _loanRepository.UpdateAsync(loansExported);
                    Log.Information($"Exported {numberOfLoansUpdated} chargebacks");
                }
                else
                {
                    Log.Error("Failure exporting loan chargebacks.");
                }
            }

            catch (Exception ex)
            {
                Log.Error(ex, "Failure exporting loan chargebacks.");
                throw;
            }

            return numberOfLoansUpdated;
        }

        public async Task<List<ImportBoatLoan>> ExportBoatLoansAsync(List<Loan> loans)
        {        
            var loansExported = new List<ImportBoatLoan>();
            try
            {
                var reserveLoans = loans.Where(l => l.ReserveAmount != 0);
                if (reserveLoans != null || reserveLoans.Any()) 
                { 
                    var groupedReserveRequests = reserveLoans.Select(ExportMapper.MapLoanToIndirectLoanForReserve).ToList();
                    var exportReserveResult = await SendBatchListMonetaryTransactionRequests(groupedReserveRequests);
                    loansExported.AddRange(MapBoatExportResults(exportReserveResult, reserveLoans.ToList()));
                }

                var chargebackLoans = loans.Where(l => l.ChargeBack != 0).ToList();
                if (chargebackLoans != null || chargebackLoans.Any())
                {
                    var groupedLoanRequests = new List<GroupedMonetaryTransactionRequest>();
                    chargebackLoans.ForEach(loan =>
                    {
                        var accountType = GetMinorAccountType(loan.AccountType);
                        groupedLoanRequests.Add(ExportMapper.MapLoanToIndirectLoanForChargeback(loan, accountType));
                    }
                    );
                    
                    var exportResult = await _coreApiServiceClient.PostMonetaryTransactions(groupedLoanRequests);
                    loansExported.AddRange(MapBoatExportResults(exportResult, chargebackLoans.ToList()));
                }
            }

            catch (Exception ex)
            {
                Log.Error(ex, "Failure exporting boat loans.");
                throw;
            }

            return loansExported;
        }

        public async Task<int> MarkReservesAsExportedAsync(List<Loan> loans, DateTime currentDate)
        {
            try
            {
                loans.ForEach(l =>
                {
                    l.ExportedReserveDate = currentDate;
                });

                await _loanRepository.UpdateAsync(loans);
                Log.Information($"Marked {loans.Count} loan reserves as exported (without exporting)");
            }
            catch (Exception ex)
            {
                Log.Error(ex, "Failure marking loan reserves as exported.");
                throw;
            }

            return loans.Count;
        }

        public async Task<int> MarkReservesAndChargebacksAsExportedAsync(List<Loan> loans, DateTime currentDate)
        {
            try
            {
                loans.ForEach(l =>
                {
                    l.ExportedReserveDate = currentDate;
                    l.ExportedChargebackDate = currentDate;
                });

                await _loanRepository.UpdateAsync(loans);
                Log.Information($"Marked {loans.Count} loan reserves and chargebacks as exported (without exporting)");
            }
            catch (Exception ex)
            {
                Log.Error(ex, "Failure marking loan  reserves and chargebacks as exported.");
                throw;
            }

            return loans.Count;
        }

        private List<ImportBoatLoan> MapBoatExportResults(List<MonetaryTransactionResponse> exportResult, List<Loan> loansToUpdate)
        {
            var numberOfLoansUpdated = 0;
            var loansExported = new List<ImportBoatLoan>();

            if (exportResult != null || exportResult.Any())
            {
                loansToUpdate.ForEach(loan =>
                {
                    var boatLoan = new ImportBoatLoan();
                    string acccountNumber;
                    if (loan.ReserveAmount != 0)
                    {
                        acccountNumber = loan.LoanNumber;
                    }
                    else
                    {
                        var accountType = GetMinorAccountType(loan.AccountType);
                        acccountNumber = accountType.GeneralLedgerAccountNumber;
                    }

                    var validLoan = exportResult.Where(e => e.AccountNumber.ToString() == acccountNumber).Any();
                    var validDealer = exportResult.Where(e => e.AccountNumber.ToString() == loan.Dealer.DealerAccountNumber).Any();

                    if (validLoan && validDealer)
                    {
                        numberOfLoansUpdated += 1;
                        boatLoan.LoanNumber = loan.LoanNumber;
                        boatLoan.WasSuccessful = true;
                    }
                    else
                    {
                        var error = $"Failure to export boat loan account number: {loan.LoanNumber}";
                        boatLoan.LoanNumber = loan.LoanNumber;
                        boatLoan.WasSuccessful = false;
                        boatLoan.ErrorMessage = error;
                        Log.Error(error);
                    }

                    loansExported.Add(boatLoan);
                });

                Log.Information($"Exported {numberOfLoansUpdated} boat loans");
            }

            return loansExported;
        }

        private MinorAccountType GetMinorAccountType(string loanAccountType)
        {
            var result = _minorAccountTypeRepository.GetMinorAccountType(loanAccountType);
            return result;
        }

        public async Task<List<MonetaryTransactionResponse>> SendBatchListMonetaryTransactionRequests(List<GroupedMonetaryTransactionRequest> groupedLoanRequests)
        {
            var result = new List<MonetaryTransactionResponse>();
            var batchSize = _rmsApiConfig.DefaultBatchSize;

            foreach (var batch in BatchHelper.CreateBatch<GroupedMonetaryTransactionRequest>(groupedLoanRequests, batchSize))
            {
                var response = await _coreApiServiceClient.PostMonetaryTransactions(batch.ToList());
                result.AddRange(response);
            };

            return result;
        }

    }
}