using System.Globalization;
using System.IO;
using CsvHelper;
using CsvHelper.Configuration;
using LCU.API.Internal.Operations.IncentiveApi.Models.Action;
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.MicroApiServices;
using LCU.Library.Internal.IncentiveApiModels.Requests;
using LCU.API.Internal.Operations.IncentiveApi.Services;
using LCU.API.Internal.Operations.IncentiveApi.Services.Transformations;
using LCU.Library.Internal.ApiResponse.Services;
using LCU.Library.Internal.IncentiveApiModels.Results;

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

public class ActionCreditCardImportService : IActionCreditCardImportService
{
    private readonly IUserRepository _userRepository;
    private readonly IActivityService _activityService;
    private readonly IDeadActivityService _deadActivityService;
    private readonly IFileOperationsApiService _fileOperationsApiService;
    private readonly ProcessResult _actionCreditCardResult;

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

    public async Task RunActionCreditCardProcess(ActionCreditCardRequest request)
    {
        try
        {
            var importedPersonal = await ImportTransactions<ActionCreditCardPersonalRow>("personal", request);
            Log.Information($"Imported {importedPersonal.Count} credit cards - personal.");

            var importedBusiness = await ImportTransactions<ActionCreditCardBusinessRow>("business", request);
            Log.Information($"Imported {importedBusiness.Count} credit cards - business.");

            _actionCreditCardResult.MessageStack.Add($"Imported {importedPersonal.Count()} personal and {importedBusiness.Count()} business credit cards.");
            await SafeQueueReturnResponse.TryQueueResponse(request, _actionCreditCardResult.Success, _actionCreditCardResult.MessageStack, nameof(ActionCreditCardImportService));
        }
        catch (Exception exception)
        {
            var message = $"There was an issue with handling Import Action Credit Card Sales Exception Message: {exception.Message}.";
            _actionCreditCardResult.MessageStack.Add(message);
            _actionCreditCardResult.Success = false;
            await SafeQueueReturnResponse.TryQueueResponse(request, _actionCreditCardResult.Success, _actionCreditCardResult.MessageStack, nameof(ActionCreditCardImportService));
        }
    }

    public async Task<IReadOnlyCollection<Activity>> ImportTransactions<T>(string fileIdentifier, ActionCreditCardRequest request) where T : IActionFileObject
    {
        var dynamicFileListRequest = request.ToDynamicActionCreditCardFileListRequest();
        var files = await _fileOperationsApiService.BuildDynamicFileList(dynamicFileListRequest);

        var activity = new List<Activity>();
        foreach (var fileName in files)
        {
            var stringContent = _fileOperationsApiService.GetFileContent($"{request.FinalBasePath}{fileName}");
            using var stringReader = new StringReader(stringContent.Result);
            var config = new CsvConfiguration(CultureInfo.InvariantCulture)
            {
                Delimiter = ",",
                HasHeaderRecord = true,
                HeaderValidated = null,
                MissingFieldFound = null,
                IgnoreBlankLines = true
            };

            using var csv = new CsvReader(stringReader, config);
            var records = csv.GetRecords<T>().ToList();
            var allActivity = await CreateActivity(records);
            await _activityService.SaveActivityRangeAsync(allActivity);

            activity.AddRange(allActivity);
        }

       return activity;
    }

    public async Task<IReadOnlyCollection<Activity>> CreateActivity<T>(IEnumerable<T> transactions) where T : IActionFileObject
    {
        var activities = new List<Activity>();
        var deadActivities = new List<DeadActivity>();
        foreach (var actionSaleRow in transactions)
        {
            var email = actionSaleRow.GetEmployeeEmail();
            var employee = string.IsNullOrEmpty(email) ? null : await FindEmployee(email);

            if (employee == null)
            {
                email = actionSaleRow.GetLoanOfficerEmail();
                employee = string.IsNullOrEmpty(email) ? null : await FindEmployee(email);
            }

            if (employee == null)
            {
                email = actionSaleRow.GetLoanOfficerEmailByName();
                employee = string.IsNullOrEmpty(email) ? null : await FindEmployee(email);
            }

            if(employee == null){

                Log.Warning($"Action Import, No user for {email}. Saving as Dead Activity.");
                deadActivities.Add(actionSaleRow.CreateDeadActivity(DeadActivityReason.MissingRequiredField, $"Action Import, No user for {email}", email));
                continue;
            }

            var homeDept = employee.FindHomeDepartment();
            if (homeDept == null)
            {
                Log.Warning($"User has no reliably determinable home department, {employee.EmployeeId}. Saving as Dead Activity.");
                deadActivities.Add(
                    actionSaleRow.CreateDeadActivity(DeadActivityReason.MissingRequiredField,
                        $"User has no reliably determinable home department, {employee.EmployeeId}", email, employee.EmployeeId));
                continue;
            }

            var activity = actionSaleRow.CreateActivity(employee);
            if (activities.Any(x => x.SourceId == activity.SourceId))
            {
                Log.Fatal(
                    $"Duplicate activity in credit card file for Incentive Manager, sourceId is {activity.SourceId}");
                continue;
            }
            activities.Add(activity);
        }

        try
        {
            await _deadActivityService.SaveDeadActivityRange(deadActivities);
        }
        catch (Exception ex)
        {
            Log.Error(ex, "Failed to save dead activities from ActionCreditCardImportService. Dead Activities will be lost.");
        }
        return activities;
    }

    private async Task<AppUser> FindEmployee(string employeeEmail)
    {
        try
        {
            return await _userRepository.FindUserByAdEmailAsync(employeeEmail);
        }
        catch(Exception ex)
        {
            Log.Warning(ex, "Error when finding user by email in ActionCreditCardImportService.");
            return null;
        }
    }
}