using CsvHelper;
using CsvHelper.Configuration;
using System.Globalization;
using System.IO;
using LCU.API.Internal.Operations.IncentiveApi.Services.MicroApiServices;
using LCU.API.Internal.Operations.IncentiveApi.Models.Temenos;
using LCU.API.Internal.Operations.IncentiveApi.Services;
using LCU.Library.Internal.ApiResponse.Services;
using LCU.Library.Internal.Exceptions;
using LCU.Library.Internal.IncentiveApiModels.Requests;
using LCU.Library.Internal.IncentiveApiModels.Results;
using LCU.API.Internal.Operations.IncentiveApiLib.Repositories;
using LCU.Library.Internal.IncentiveApiModels.Entities;
using LCU.Library.Internal.IncentiveApiModels.Enums;
using LCU.API.Internal.Operations.IncentiveApi.Services.Transformations;

namespace LCU.API.Internal.Operations.IncentiveApi.Services.Temenos;

public class ImportIndirectVehicleSalesService : IImportIndirectVehicleSalesService
{
    private readonly IUserRepository _userRepository;
    private readonly IActivityService _activityService;
    private readonly IFileOperationsApiService _fileOperationsApiService;
    private readonly IDeadActivityService _deadActivityService;
    private readonly ProcessResult _importIndirectVehicleSalesResult;

    public ImportIndirectVehicleSalesService(IActivityService activityService, IUserRepository userRepository,                                                 
                                             IFileOperationsApiService fileOperationsApiService, IDeadActivityService deadActivityService)
    {
        _activityService = activityService;
        _userRepository = userRepository;
        _fileOperationsApiService = fileOperationsApiService;
        _deadActivityService = deadActivityService;
        _importIndirectVehicleSalesResult = new ProcessResult();
    }

    
    public async Task HandleImportIndirectVehicleSales(ImportIndirectVehicleSalesRequest request)
    {
        try
        {
            var records = await GetIndirectVehicleRecordsForImport(request);
            await CreateAndSaveActivities(records);
            await SafeQueueReturnResponse.TryQueueResponse(request, _importIndirectVehicleSalesResult.Success, _importIndirectVehicleSalesResult.MessageStack, nameof(ImportIndirectVehicleSalesService));
        }
        catch (Exception exception)
        {
            var message = $"There was an issue with handling Import Indirect Vehicle Sales. Exception Message: {exception.Message}.";
            _importIndirectVehicleSalesResult.MessageStack.Add(message);
            _importIndirectVehicleSalesResult.Success = false;
            await SafeQueueReturnResponse.TryQueueResponse(request, _importIndirectVehicleSalesResult.Success, _importIndirectVehicleSalesResult.MessageStack, nameof(ImportIndirectVehicleSalesService));
        }
    }

    private async Task<List<IndirectVehicleSaleRecord>> GetIndirectVehicleRecordsForImport(ImportIndirectVehicleSalesRequest request)
    {
        var recordsToImport = new List<IndirectVehicleSaleRecord>();

        var directDynamicFileListRequest = request.ToDirectDynamicVehicleFileListRequest(request.DirectDynamicFileName);
        var directFiles = await _fileOperationsApiService.BuildDynamicFileList(directDynamicFileListRequest);

        var directRecords = new List<DirectVehicleSaleRecord>();

        foreach (var file in directFiles)
        {
            directRecords.AddRange(await GetRecords<DirectVehicleSaleRecord>(request.FinalBasePath + file));
        }

        if (directRecords.Any())
        {
            var indirectDynamicFileListRequest = request.ToIndirectDynamicVehicleFileListRequest(request.IndirectDynamicFileName);

            var indirectFiles = await _fileOperationsApiService.BuildDynamicFileList(indirectDynamicFileListRequest);
            var indirectRecords = new List<IndirectVehicleSaleRecord>();

            foreach(var file in indirectFiles)
            {
                indirectRecords.AddRange(await GetRecords<IndirectVehicleSaleRecord>(request.FinalBasePath + file));
            }

            recordsToImport = GetIndirectRecordsToImport(directRecords, indirectRecords);
        }

        return recordsToImport;
    }

    private async Task CreateAndSaveActivities(List<IndirectVehicleSaleRecord> records)
    {
        var activities = new List<Activity>();
        var deadActivities = new List<DeadActivity>();

        foreach (var record in records)
        {
            var activity = new Activity()
            {
                Product = Product.Vehicle,
                Type = ActivityType.Sale,
                State = ActivityState.Accepted,
                SourceSystem = SystemType.Temenos,
                SourceCreated = DateTime.Parse(record.DisbursedDate),
                Accepted = DateTime.Parse(record.DisbursedDate).Date.AddHours(12),
                SourceId = record.ApplicationID,
                Detail = new ActivityDetail()
                {
                    AccountNumber = record.AccountNumber,
                    MemberName = record.ApplicantName,
                    AccountBalance = !string.IsNullOrEmpty(record.AmountFinanced)
                                     ? ParseMoneyDouble(record.AmountFinanced)
                                     : ParseMoneyDouble("0.0"),
                    AccountStatus = record.SubProduct
                },
                EmployeeEmail = null,
                EmployeeId = null,
                DepartmentId = -1
            };

            var employee = await FindEmployee(record.ReferringEmployeeEmail);
            if (employee == null)
            {
                var message = $"Temenos Import, No user for {record.ReferringEmployeeEmail}. Saving as Dead Activity.";
                _importIndirectVehicleSalesResult.MessageStack.Add(message);
                activity.EmployeeEmail = record.ReferringEmployeeEmail;
                deadActivities.Add(new DeadActivity(activity, DeadActivityReason.MissingRequiredField, message));
                continue;
            }

            activity.AppUserId = employee.Id;
            activity.EmployeeEmail = employee.AdEmail;
            activity.EmployeeId = employee.EmployeeId;

            var homeDept = employee.FindHomeDepartment();
            if (homeDept == null)
            {
                var message = $"User has no reliably determinable home department, {employee.EmployeeId}. Saving as Dead Activity.";
                _importIndirectVehicleSalesResult.MessageStack.Add(message);
                deadActivities.Add(new DeadActivity(activity, DeadActivityReason.MissingRequiredField, message));
                continue;
            }

            activity.DepartmentId = homeDept.DepartmentId;
            activities.Add(activity);
        }

        if (activities.Any())
        {
            await SaveActivities(activities);
        }

        if (deadActivities.Any())
        {
            await SaveDeadActivities(deadActivities);
        }

        _importIndirectVehicleSalesResult.MessageStack.Add($"Imported { activities.Count + deadActivities.Count } indirect vehicle sales.");
    }

    private async Task<AppUser> FindEmployee(string employeeEmail)
    {
        try
        {
            return await _userRepository.FindUserByAdEmailAsync(employeeEmail);
        }
        catch (Exception exception)
        {
            _importIndirectVehicleSalesResult.MessageStack.Add($"Error when finding user by email in ImportIndirectVehicleSalesService. Exception message: { exception.Message }");
            return null;
        }
    }

    private async Task SaveActivities(List<Activity> activities)
    {
        try
        {
            await _activityService.SaveActivityRangeAsync(activities);
        }
        catch (Exception exception)
        {
            var message = $"Failed to save activities from ImportIndirectVehicleSalesService. Activities will be lost. Eception Message: {exception.Message}";
            _importIndirectVehicleSalesResult.MessageStack.Add(message);
            throw new ServiceException($"{message}. Exception: {exception.Message}");
        }
    }

    private async Task SaveDeadActivities(List<DeadActivity> deadActivities)
    {
        try
        {
            await _deadActivityService.SaveDeadActivityRange(deadActivities);
        }
        catch (Exception exception)
        {
            var message = $"Failed to save dead activities from ImportIndirectVehicleSalesService. Dead Activities will be lost. Eception Message: {exception.Message}";
            _importIndirectVehicleSalesResult.MessageStack.Add(message);
            throw new ServiceException($"{message}. Exception: {exception.Message}");
        }
    }

    private static List<IndirectVehicleSaleRecord> GetIndirectRecordsToImport(List<DirectVehicleSaleRecord> directRecords, List<IndirectVehicleSaleRecord> indirectRecords)
    {
        var recordsToImport = new List<IndirectVehicleSaleRecord>();

        foreach (var indirectRecord in indirectRecords)
        {
            if (!recordsToImport.Any(x => x.ApplicationID == indirectRecord.ApplicationID))
            {
                var directSsnMatches = directRecords.Where(x => x.ApplicantSSN == indirectRecord.ApplicantSSN);
                var directCreatedBeforeIndirectMatches = directSsnMatches.Where(x => DateTime.Parse(x.CreatedDate) < DateTime.Parse(indirectRecord.CreatedDate));

                if (directCreatedBeforeIndirectMatches.Any())
                {
                    var matchedDirectRecord = directCreatedBeforeIndirectMatches.OrderByDescending(x => DateTime.Parse(x.CreatedDate)).FirstOrDefault();
                    indirectRecord.ReferringEmployeeEmail = matchedDirectRecord?.ReferringEmployeeEmail;
                    recordsToImport.Add(indirectRecord);
                }
            }
        }

        return recordsToImport;
    }

    private async Task<List<TResponse>> GetRecords<TResponse>(string filePathAndName)
    {
        var contents = await _fileOperationsApiService.GetFileContent(filePathAndName);
        using var stringReader = new StringReader(contents);
        var config = new CsvConfiguration(CultureInfo.InvariantCulture)
        {
            Delimiter = "|",
            HasHeaderRecord = false
        };

        using var csv = new CsvReader(stringReader, config);
        return csv.GetRecords<TResponse>().ToList();
    }

    private double? ParseMoneyDouble(string amountFinanced)
    {
        var parsed = decimal.Parse(amountFinanced, NumberStyles.Currency, new CultureInfo("en-Us"));
        return (double)parsed;
    }
}