using AutoMapper;
using DamageAssesment.Api.SurveyResponses.Db;
using DamageAssesment.Api.SurveyResponses.Interfaces;
using DamageAssesment.Api.SurveyResponses.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Internal;
using System.Diagnostics;
using static Microsoft.EntityFrameworkCore.DbLoggerCategory;

namespace DamageAssesment.Api.SurveyResponses.Providers
{
    public class SurveyResponsesProvider : ISurveysResponse
    {
        private readonly SurveyResponseDbContext surveyResponseDbContext;
        private readonly ILogger<SurveyResponsesProvider> logger;
        private readonly IAnswerServiceProvider answerServiceProvider;
        private readonly IRegionServiceProvider regionServiceProvider;
        private readonly ILocationServiceProvider locationServiceProvider;
        private readonly IEmployeeServiceProvider employeeServiceProvider;
        private readonly IAttachmentServiceProvider attachmentServiceProvider;
        private readonly IQuestionServiceProvider questionServiceProvider;
        private readonly ISurveyServiceProvider surveyServiceProvider;
        private readonly IMapper mapper;

        public SurveyResponsesProvider(SurveyResponseDbContext surveyResponseDbContext, ILogger<SurveyResponsesProvider> logger, IAnswerServiceProvider answerServiceProvider, IRegionServiceProvider regionServiceProvider, ILocationServiceProvider locationServiceProvider, IEmployeeServiceProvider employeeServiceProvider, IAttachmentServiceProvider attachmentServiceProvider, IQuestionServiceProvider questionServiceProvider, ISurveyServiceProvider surveyServiceProvider, IMapper mapper)
        {
            this.surveyResponseDbContext = surveyResponseDbContext;
            this.logger = logger;
            this.answerServiceProvider = answerServiceProvider;
            this.regionServiceProvider = regionServiceProvider;
            this.locationServiceProvider = locationServiceProvider;
            this.employeeServiceProvider = employeeServiceProvider;
            this.attachmentServiceProvider = attachmentServiceProvider;
            this.questionServiceProvider = questionServiceProvider;
            this.surveyServiceProvider = surveyServiceProvider;
            this.mapper = mapper;

            seedData();
        }

        private void seedData()
        {
            if (!surveyResponseDbContext.SurveyResponses.Any())
            {
                surveyResponseDbContext.SurveyResponses.Add(new Db.SurveyResponse { Id = 1, SurveyId = 1, EmployeeId = "Emp1", LocationId = "Loc1" });
                surveyResponseDbContext.SurveyResponses.Add(new Db.SurveyResponse { Id = 2, SurveyId = 1, EmployeeId = "Emp2", LocationId = "Loc2" });
                surveyResponseDbContext.SurveyResponses.Add(new Db.SurveyResponse { Id = 3, SurveyId = 3, EmployeeId = "Emp4", LocationId = "Loc1" });
                surveyResponseDbContext.SurveyResponses.Add(new Db.SurveyResponse { Id = 4, SurveyId = 4, EmployeeId = "Emp1", LocationId = "Loc2" });
                surveyResponseDbContext.SurveyResponses.Add(new Db.SurveyResponse { Id = 5, SurveyId = 1, EmployeeId = "Emp3", LocationId = "Loc3" });
                surveyResponseDbContext.SurveyResponses.Add(new Db.SurveyResponse { Id = 6, SurveyId = 1, EmployeeId = "Emp4", LocationId = "Loc2" });
                surveyResponseDbContext.SurveyResponses.Add(new Db.SurveyResponse { Id = 7, SurveyId = 1, EmployeeId = "Emp4", LocationId = "Loc3" });
                surveyResponseDbContext.SaveChanges();
            }
        }

        public async Task<(bool IsSuccess, dynamic Answers, string ErrorMessage)> GetAnswersByRegionAsync(int surveyId)
        {
            try
            {
                logger?.LogInformation("Querying to get SurveyResponse object from DB");
                var listSurveyResponse = surveyResponseDbContext.SurveyResponses.Where(s => s.SurveyId == surveyId);

                if (listSurveyResponse.Any())
                {
                    var answers = await getAnswersByRegionAndSurveyIdAsync(listSurveyResponse);
                    return (true, answers, "Request Successful.");
                }
                else
                {
                    return (false, null, "Not found");
                }
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }

        public async Task<(bool IsSuccess, dynamic SurveyResponse, string ErrorMessage)> GetSurveyResponseByIdAsync(int responseId)
        {
            try
            {
                logger?.LogInformation("Querying to get SurveyResponse object from DB");
                var surveyResponse = surveyResponseDbContext.SurveyResponses.Where(s => s.Id == responseId).SingleOrDefault();

                if (surveyResponse != null)
                {
                    var answers = await getSurveyResponseByResponseIdAsync(surveyResponse);

                    if (answers != null)
                        return (true, answers, "Request Successful.");
                    else
                    {
                        answers = new { };
                        return (true, answers, "Empty object returned");
                    }
                }
                else
                {
                    return (false, null, "Not found");
                }
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }



        public async Task<(bool IsSuccess, dynamic SurveyResponses, string ErrorMessage)> GetSurveyResponsesBySurveyAsync(int surveyId)
        {
            try
            {
                logger?.LogInformation("Querying to get Survey object from microservice");
                var survey = await surveyServiceProvider.getSurveyAsync(surveyId);

                if (survey != null)
                {
                    var answers = await getSurveyResponsesBySurveyIdAsync(surveyId);

                    if (answers != null)
                        return (true, answers, "Request Successful.");
                    else
                    {
                        answers = new List<Models.SurveyResponse>();
                        return (true, answers, "Empty object returned");
                    }
                }
                else
                {
                    return (false, null, "Not found");
                }
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }

        public async Task<(bool IsSuccess, dynamic SurveyResponses, string ErrorMessage)> GetSurveyResponsesBySurveyAndLocationAsync(int surveyId, string locationId)
        {
            try
            {
                logger?.LogInformation("Querying to get Survey object from microservice");
                var survey = await surveyServiceProvider.getSurveyAsync(surveyId);

                if (survey != null)
                {
                    var answers = await getSurveyResponsesBySurveyIdLocationIdAsync(surveyId, locationId);

                    if (answers != null)
                        return (true, answers, "Request Successful.");
                    else
                    {
                        answers = new List<Models.SurveyResponse>();
                        return (true, answers, "Empty object returned");
                    }
                }
                else
                {
                    return (false, null, "Not found");
                }
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }

        public async Task<(bool IsSuccess, dynamic SurveyResponses, string ErrorMessage)> GetSurveyResponsesByMaintenanceCenterAsync(int surveyId)
        {
            try
            {
                logger?.LogInformation("Querying to get Survey object from microservice");
                var survey = await surveyServiceProvider.getSurveyAsync(surveyId);

                if (survey != null)
                {
                    var answers = await getResultsByMaintenanceCenterAsync(surveyId);

                    if (answers != null)
                        return (true, answers, "Request Successful.");
                    else
                    {
                        answers = new List<Models.SurveyResponse>();
                        return (true, answers, "Empty object returned");
                    }
                }
                else
                {
                    return (false, null, "Not found");
                }
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }

        public async Task<(bool IsSuccess, dynamic SurveyResponses, string ErrorMessage)> GetResponsesByAnswerAsync(int surveyId, int questionId, string answer)
        {
            try
            {
                logger?.LogInformation("Querying to get Survey object from microservice");
                var survey = await surveyServiceProvider.getSurveyAsync(surveyId);
                var question = await questionServiceProvider.getQuestionsAsync(questionId);
                bool IsCorrectAnswer = answer.ToLower().Equals("yes") || answer.ToLower().Equals("no") ? true : false;

          
                if (survey != null && question != null && IsCorrectAnswer)
                {
                    var answers = await getSurveyResponsesByAnswerAsync(survey, question, answer);

                    if (answers != null)
                        return (true, answers, "Request Successful.");
                    else
                    {
                        answers = new List<Models.SurveyResponse>();
                        return (true, answers, "Empty object returned");
                    }
                }
                else
                {
                    return (false, null, "Not found");
                } 
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }


        public async Task<(bool IsSuccess, dynamic surveyResponses, string ErrorMessage)> GetSurveyResponsesAsync()
        {
            try
            {
                var answers = await getAllSurveyResponsesAsync();

                if (answers != null)
                    return (true, answers, "Request Successful.");
                else
                {
                    answers = new List<Models.SurveyResponse>();
                    return (true, answers, "Empty object returned");
                }

            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }

        public async Task<(bool IsSuccess, Models.SurveyResponse SurveyResponse, string ErrorMessage)> PostSurveyResponseAsync(Models.SurveyResponse surveyResponse)
        {
            try
            {
                if (surveyResponse != null)
                {
                    var surveyResponses = await surveyResponseDbContext.SurveyResponses.ToListAsync();
                    surveyResponse.Id = surveyResponses.Count + 1;
                    surveyResponseDbContext.SurveyResponses.Add(mapper.Map<Models.SurveyResponse, Db.SurveyResponse>(surveyResponse));
                    surveyResponseDbContext.SaveChanges();
                    return (true, surveyResponse, "Request Successful");
                }
                else
                {
                    logger?.LogInformation($"SurveyResponseID={surveyResponse.Id} cannot be added");
                    return (false, null, "Survey cannot be added");
                }
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }


        public async Task<(bool IsSuccess, Models.SurveyResponse SurveyResponse, string ErrorMessage)> PutSurveyResponseAsync(int Id, Models.SurveyResponse SurveyResponse)
        {
            try
            {
                if (SurveyResponse != null)
                {
                    var _SurveyResponse = await surveyResponseDbContext.SurveyResponses.Where(s => s.Id == Id).FirstOrDefaultAsync();

                    if (_SurveyResponse != null)
                    {
                        _SurveyResponse.SurveyId = SurveyResponse.SurveyId;
                        _SurveyResponse.EmployeeId = SurveyResponse.EmployeeId;
                        _SurveyResponse.LocationId = SurveyResponse.LocationId;
                        surveyResponseDbContext.SaveChanges();
                        return (true, mapper.Map<Db.SurveyResponse, Models.SurveyResponse>(_SurveyResponse), "Successful");
                    }
                    else
                    {
                        logger?.LogInformation($"SurveyReponseId = {Id} Not found");
                        return (false, null, "Not Found");
                    }

                }
                else
                {
                    logger?.LogInformation($"SurveyReponseId = {Id} Bad Request");
                    return (false, null, "Bad request");
                }
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }

        public async Task<(bool IsSuccess, Models.SurveyResponse SurveyResponse, string ErrorMessage)> DeleteSurveyResponseAsync(int Id)
        {
            try
            {
                var _SurveyResponse = await surveyResponseDbContext.SurveyResponses.Where(s => s.Id == Id).FirstOrDefaultAsync();

                if (_SurveyResponse != null)
                {
                    surveyResponseDbContext.Remove(_SurveyResponse);
                    surveyResponseDbContext.SaveChanges();
                    return (true, mapper.Map<Db.SurveyResponse, Models.SurveyResponse>(_SurveyResponse), "Successful");
                }
                else
                {
                    logger?.LogInformation($"SurveyReponseId = {Id} Not found");
                    return (false, null, "Not Found");
                }

            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }

        //Method to get Answers by region with surveyId as input parameter
        private async Task<dynamic> getAnswersByRegionAndSurveyIdAsync(IQueryable<Db.SurveyResponse> surveyResponses)
        {
            try
            {
                var answersList = await answerServiceProvider.getAnswersAsync();
                if (answersList == null || !answersList.Any())
                    return null;

                //get all the answers for the particular survey
                var surveyAnswers = answersList.Join(
                                       surveyResponses,
                                       answer => answer.SurveyResponseId,
                                       surveyResponse => surveyResponse.Id,
                                       (answer, surveyResponse) => new
                                       Answer
                                       {
                                           Id = answer.Id,
                                           QuestionId = answer.QuestionId,
                                           AnswerText = answer.AnswerText,
                                           Comment = answer.Comment,
                                           LocationId = surveyResponse.LocationId,
                                           SurveyResponseId = surveyResponse.Id
                                       });

                if (surveyAnswers == null || !surveyAnswers.Any())
                    return null;

                var regions = await regionServiceProvider.getRegionsAsync();
                var locations = await locationServiceProvider.getLocationsAsync();

                if (regions == null || !regions.Any() || locations == null || !locations.Any())
                    return null;


                //get all the answers based on the locations
                var result = from answer in surveyAnswers
                             from location in locations
                             where answer.LocationId == location.Id
                             select new Answer
                             {
                                 Id = answer.Id,
                                 QuestionId = answer.QuestionId,
                                 AnswerText = answer.AnswerText,
                                 Comment = answer.Comment,
                                 RegionId = location.RegionId,
                                 LocationId = location.Id,
                                 SurveyResponseId = answer.SurveyResponseId
                             };

                //group records by answer and region
                var q = from e in result
                        group e by (e.RegionId, e.AnswerText) into g
                        select new AggregateResult
                        {
                            RegionId = g.Key.RegionId,
                            Answers = new AggregateAnswer
                            {
                                Answer = g.Key.AnswerText,
                                Counter = g.Count()
                            }
                        };

                //build the result
                List<AnswerData> resultList = new List<AnswerData>();
                foreach (Region region in regions)
                {
                    var answers = q.Where(x => x.RegionId.Equals(region.Id)).Select(x => x.Answers).ToList();
                    resultList.Add(new AnswerData { RegionId = region.Id, Name = region.Name, Abbreviation = region.Abbreviation, Answers = answers });
                }

                //return the object result
                return new ResultData { Regions = resultList };
            }
            catch (Exception ex)
            {
                logger?.LogError($"Exception Found : {ex.Message} - Ref: SurveyResponsesProvider.getSurveyResultAsync()");
                return null;
            }
        }

        //Method to get Survey Response by ResponseId
        private async Task<dynamic> getSurveyResponseByResponseIdAsync(Db.SurveyResponse surveyResponse)
        {
            try
            {
                var surveyResonses = await surveyResponseDbContext.SurveyResponses.Where(x => x.Id == surveyResponse.Id).ToListAsync();
                //var surveyResponse = surveyResonses.SingleOrDefault();
                var employee = await employeeServiceProvider.getEmployeeAsync(surveyResponse.EmployeeId);
                var answers = await answerServiceProvider.GetAnswersByResponseIdAsync(surveyResponse.Id);
                var allQuestions = await questionServiceProvider.getQuestionsAsync();
                var questions = allQuestions.Where(s=> s.SurveyId == surveyResponse.Id);
                var attachments = await attachmentServiceProvider.getAttachmentsAsync();


                var result = from r in surveyResonses
                             select new
                             {
                                 r.Id,
                                 r.SurveyId,
                                 r.LocationId,
                                 r.EmployeeId,
                                 Employee = employee,
                                 answers = from ans in answers
                                           select new
                                           {
                                               ans.QuestionId,
                                               ans.Id,
                                               ans.AnswerText,
                                               ans.Comment,
                                               Questions = (from q in questions where q.Id == ans.QuestionId select new { q.Id, q.QuestionNumber, q.QuestionGroup, q.Questions }).SingleOrDefault(),
                                               Attachments = from att in attachments where att.AnswerId == ans.Id select new { att.Id, att.URI }
                                           }
                             };
                return result.SingleOrDefault();
            }
            catch (Exception ex)
            {
                logger?.LogError($"Exception Found : {ex.Message} - Ref: SurveyResponsesProvider.getSurveyResultAsync()");
                return null;
            }
        }


        //Method to get Survey Responses by surveyId
        private async Task<dynamic> getSurveyResponsesBySurveyIdAsync(int surveyId)
        {
            try
            {
                var surveyResonses = await surveyResponseDbContext.SurveyResponses.Where(x => x.SurveyId == surveyId).ToListAsync();

                var employees = await employeeServiceProvider.getEmployeesAsync();
                var answers = await answerServiceProvider.getAnswersAsync();
                var questions = await questionServiceProvider.getQuestionsAsync();
                var surveyQuestions = from q in questions where q.SurveyId == surveyId select q;

                //var surveyQuestions = await questionServiceProvider.getSurveyQuestionsAsync(surveyId);

                var attachments = await attachmentServiceProvider.getAttachmentsAsync();
                var result = from r in surveyResonses
                             select new
                             {
                                 r.Id,
                                 r.SurveyId,
                                 r.LocationId,
                                 r.EmployeeId,
                                 Employee = (from e in employees where e.Id == r.EmployeeId select new { e.Id, e.Name, e.BirthDate, e.Email, e.OfficePhoneNumber }).SingleOrDefault(),
                                 answers = from ans in answers
                                           where ans.SurveyResponseId == r.Id
                                           select new
                                           {
                                               ans.Id,
                                               ans.QuestionId,
                                               ans.AnswerText,
                                               ans.Comment,
                                               Questions = (from q in surveyQuestions where q.Id == ans.QuestionId select new { q.Id, q.QuestionNumber, q.QuestionGroup, q.Questions }).SingleOrDefault(),
                                               Attachments = from att in attachments where att.AnswerId == ans.Id select new { att.Id, att.URI }

                                           }
                             };
                return result;
            }
            catch (Exception ex)
            {
                logger?.LogError($"Exception Found : {ex.Message} - Ref: SurveyResponsesProvider.getSurveyResponseBySurveyIdAsync()");
                return null;
            }
        }


        //Method to get All Survey Responses
        private async Task<dynamic> getAllSurveyResponsesAsync()
        {
            try
            {
                var surveyResonses = await surveyResponseDbContext.SurveyResponses.ToListAsync();

                var employees = await employeeServiceProvider.getEmployeesAsync();
                var answers = await answerServiceProvider.getAnswersAsync();
                var questions = await questionServiceProvider.getQuestionsAsync();
                var attachments = await attachmentServiceProvider.getAttachmentsAsync();

                var result = from r in surveyResonses
                             select new
                             {
                                 r.Id,
                                 r.SurveyId,
                                 r.LocationId,
                                 r.EmployeeId,
                                 Employee = (from e in employees where r.EmployeeId == e.Id select new { e.Id, e.Name, e.BirthDate, e.Email, e.OfficePhoneNumber }).SingleOrDefault(),
                                 answers = from ans in answers
                                           where ans.SurveyResponseId == r.Id
                                           select new
                                           {
                                               ans.Id,
                                               ans.QuestionId,
                                               ans.AnswerText,
                                               ans.Comment,
                                               Questions = (from q in questions where q.Id == ans.QuestionId select new { q.Id, q.QuestionNumber, q.QuestionGroup, q.Questions }).SingleOrDefault(),
                                               Attachments = from att in attachments where att.AnswerId == ans.Id select new { att.Id, att.URI }
                                           }
                             };
                return result;
            }
            catch (Exception ex)
            {
                logger?.LogError($"Exception Found : {ex.Message} - Ref: SurveyResponsesProvider.getSurveyResponseBySurveyIdAsync()");
                return null;
            }
        }


        //Method to get Answers By Maintenance Center by surveyId
        private async Task<dynamic> getResultsByMaintenanceCenterAsync(int surveyId)
        {
            try
            {
                var surveyResponses = await surveyResponseDbContext.SurveyResponses.Where(x => x.SurveyId == surveyId).ToListAsync();
                var answers = await answerServiceProvider.getAnswersAsync();
                var locations = await locationServiceProvider.getLocationsAsync();
                var maintenanceCenters = locations.DistinctBy(m => m.MaintenanceCenter);

                //get all the answers for the particular survey
                var surveyAnswers = from resp in surveyResponses
                                    from ans in answers
                                    where ans.SurveyResponseId.Equals(resp.Id)
                                    select new
                                    {
                                        AnswerId = ans.Id,
                                        ans.QuestionId,
                                        ans.AnswerText,
                                        ans.Comment,
                                        resp.LocationId,
                                        ResponseId = resp.Id
                                    };

                //get all the answers with location
                var surveyAnswersLocations = from surveyAns in surveyAnswers
                                             from location in locations
                                             where surveyAns.LocationId == location.Id
                                             select new { surveyAns, location.MaintenanceCenter };

                //aggreting the answers
                var aggregatedResult = from e in surveyAnswersLocations
                                       group e by (e.MaintenanceCenter, e.surveyAns.AnswerText) into g
                                       select new
                                       {
                                           g.Key.MaintenanceCenter,
                                           Answers = new AggregateAnswer
                                           {
                                               Answer = g.Key.AnswerText,
                                               Counter = g.Count()
                                           }
                                       };

                //format the result foreach maintenance center
                List<dynamic> results = new List<dynamic>();
                foreach (Location m in maintenanceCenters)
                {
                    var _answers = aggregatedResult.Where(x => x.MaintenanceCenter.Equals(m.MaintenanceCenter)).Select(x => x.Answers).ToList();
                    results.Add(new { m.Name, m.Id, m.RegionId, m.MaintenanceCenter, m.SchoolType, Answers = _answers });
                }

                return results;
            }
            catch (Exception ex)
            {
                logger?.LogError($"Exception Found : {ex.Message} - Ref: SurveyResponsesProvider.getSurveyResponseBySurveyIdAsync()");
                return null;
            }
        }

        //Method to get Survey Responses by surveyId and LocationId
        private async Task<dynamic> getSurveyResponsesBySurveyIdLocationIdAsync(int surveyId, string locationId)
        {
            try
            {
                var surveyResonses = await surveyResponseDbContext.SurveyResponses.Where(x => x.SurveyId == surveyId && x.LocationId.Equals(locationId)).ToListAsync();

                var employees = await employeeServiceProvider.getEmployeesAsync();
                var answers = await answerServiceProvider.getAnswersAsync();
                var questions = await questionServiceProvider.getQuestionsAsync();
                var surveyQuestions = from q in questions where q.SurveyId == surveyId select q;
                var attachments = await attachmentServiceProvider.getAttachmentsAsync();

                var result = from r in surveyResonses
                             select new
                             {
                                 r.Id,
                                 r.SurveyId,
                                 r.LocationId,
                                 r.EmployeeId,
                                 Employee = (from e in employees where r.EmployeeId == e.Id select new { e.Id, e.Name, e.BirthDate, e.Email, e.OfficePhoneNumber }).SingleOrDefault(),
                                 answers = from ans in answers
                                           where ans.SurveyResponseId == r.Id

                                           select new
                                           {
                                               ans.QuestionId,
                                               ans.Id,
                                               ans.AnswerText,
                                               ans.Comment,
                                               Questions = (from q in surveyQuestions where q.Id == ans.QuestionId select new { q.Id, q.QuestionNumber, q.QuestionGroup, q.Questions }).SingleOrDefault(),
                                               Attachments = from att in attachments where att.AnswerId == ans.Id select new { att.Id, att.URI }
                                           }
                             };
                return result;
            }
            catch (Exception ex)
            {
                logger?.LogError($"Exception Found : {ex.Message} - Ref: SurveyResponsesProvider.getSurveyResponseBySurveyIdAsync()");
                return null;
            }
        }


        //Method to get Survey Responses by surveyId questionId and answer
        private async Task<dynamic> getSurveyResponsesByAnswerAsync(Survey survey, Question question, string answer)
        {
            try
            {
                var surveyResponses = await surveyResponseDbContext.SurveyResponses.Where(x => x.SurveyId == survey.Id).ToListAsync();
                //var questions = await questionServiceProvider.getQuestionsAsync();
              
                var answers = await answerServiceProvider.getAnswersAsync();
                var employees = await employeeServiceProvider.getEmployeesAsync();
                var attachments = await attachmentServiceProvider.getAttachmentsAsync();

                var result = from r in surveyResponses
                             select new
                             {
                                 r.Id,
                                 r.SurveyId,
                                 r.LocationId,
                                 r.EmployeeId,
                                 Employee = (from e in employees where r.EmployeeId == e.Id select new { e.Id, e.Name, e.BirthDate, e.Email, e.OfficePhoneNumber }).SingleOrDefault(),
                                 answers = from ans in answers
                                           where ans.SurveyResponseId == r.Id
                                           && ans.QuestionId == question.Id
                                           && ans.AnswerText.ToLower().Equals(answer.ToLower())

                                           select new
                                           {
                                               ans.QuestionId,
                                               AnswerId = ans.Id,
                                               ans.AnswerText,
                                               ans.Comment,
                                               Question = question,
                                               Attachments = from att in attachments where att.AnswerId == ans.Id select new { att.Id, att.URI }
                                           }
                             };
                return result;
            }
            catch (Exception ex)
            {
                logger?.LogError($"Exception Found : {ex.Message} - Ref: SurveyResponsesProvider.getSurveyResponseBySurveyIdAsync()");
                return null;
            }
        }


        bool ProcessAnswers(QuestionRequest questionRequest, int surveyResponseId)
        {
            if (questionRequest != null)
            {
                var answer = answerServiceProvider.PostAnswersAsync(new Answer {QuestionId = questionRequest.QuestionId, AnswerText = questionRequest.AnswerText, Comment = questionRequest.Comment, SurveyResponseId = surveyResponseId });
                if (answer != null)
                {
                    List<AnswerInfo> listAnswerInfo = new List<AnswerInfo>();
                    listAnswerInfo.Add(new AnswerInfo { AnswerId = answer.Id, postedFiles = questionRequest.PostedFiles });
                    var attachments =  attachmentServiceProvider.PostAttachmentsAsync(new AttachmentInfo { ResponseId = surveyResponseId, Answers = listAnswerInfo });

                    string message = $"Answer for question {questionRequest.QuestionId} saved to the database";
                    logger?.LogInformation(message);
                    return (true);
                }
                else
                {
                    string message = $"Answer for question {questionRequest.QuestionId} cannot be saved to the database";
                    logger?.LogInformation(message);
                    return (false);
                }
            }
            else
            {
                var message = $"Answer for question {questionRequest.QuestionId} cannot be saved to the database - questionRequest object is null";
                logger?.LogInformation(message);
                return (false);
            }
        }


        public async Task<(bool IsSuccess, Models.SurveyResponse SurveyResponse, string ErrorMessage)> PostSurveyAnswersAsync(Models.AnswerRequest answers)
        {
            try
            {
                if (answers != null)
                {
                    var response = await PostSurveyResponseAsync(new Models.SurveyResponse { Id = 0, SurveyId = answers.SurveyId, EmployeeId = answers.EmployeeId, LocationId = answers.LocationId });

                    if (response.IsSuccess)
                    {
                        var surveyResponse = response.SurveyResponse;

                        var answerTasks = new List<Task>(); //new List<string>();

                        //var tasks = answers.Answers.Select(x =>  ProcessAnswers(x,surveyResponse.SurveyResponseID));
                        foreach (QuestionRequest ans in answers.Answers)
                        {
                            ProcessAnswers(ans, surveyResponse.Id);
                            //var stopwatch = new Stopwatch();
                            //stopwatch.Start();
                            // var task = Task.Run(() => ProcessAnswers(ans, surveyResponse.Id));

                            //var task = await ProcessAnswers(ans, surveyResponse.Id);
                            //answerTasks.Add(task);


                            //stopwatch.Stop();
                            //answerTasks.Add(ProcessAnswers(ans, surveyResponse.Id));
                        }
                        //await Task.WhenAll(answerTasks);
                        return (true, surveyResponse, null);
                    }
                    else
                    {
                        var message = "Survey answers cannot be saved to the database";
                        logger?.LogInformation(message);
                        return (false, null, message);
                    }
                }
                else
                {
                    var message = "Request failed because null object is submitted";
                    logger?.LogInformation(message);
                    return (false, null, message);
                }
            }
            catch (Exception ex)
            {
                logger?.LogError(ex.ToString());
                return (false, null, ex.Message);
            }
        }
    }
}