using System;
using System.Collections.Generic;
using System.IO;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Options;
using MongoDB.Bson;
using MongoDB.Driver;
using Serilog;
using Landmark.OLA.Application.Common.Security;
using Landmark.OLA.Application.Configuration;
using Landmark.OLA.Application.DataAccess;
using Landmark.OLA.Application.Services.MicroApiServices;
using Landmark.OLA.Models.Loan;
using Landmark.OLA.Models.Loan.Enums;
using LCU.Library.Internal.NotificationsModels.Models;




namespace Landmark.OLA.Application.DataAccessLayer
{
    public class LoanApplicationDataAccess : IDisposable, ILoanApplicationDataAccess
    {
        private bool disposed = false;
        private readonly IDataClient _client;
        private readonly INotificationsApiService _notificationsApiService;
        private readonly string _collectionName = "Applications";
        private readonly NotificationsApiConfiguration _notificationsApiConfiguration;
        private readonly Services.Email.IEmailTemplateService _emailTemplateService;

        public LoanApplicationDataAccess(
             IDataClient dataClient,
             INotificationsApiService notificationsApiService,
             IOptions<NotificationsApiConfiguration> notificationsApiConfiguration,
             IWebHostEnvironment webHostEnvironment,
             Services.Email.IEmailTemplateService emailTemplateService)
        {
            _client = dataClient;
            _notificationsApiService = notificationsApiService;
            _notificationsApiConfiguration = notificationsApiConfiguration.Value;
            _emailTemplateService = emailTemplateService;
        }


        public LoanContainer GetContainerById(string guid)
        {
            try
            {
                var collection = GetLoanContainersCollection();
                var foundItems = collection.Find(eachContainer => eachContainer.Id == guid);
                if (foundItems.CountDocuments() != 1)
                {
                    throw new KeyNotFoundException("Item not found");
                }
                return foundItems.First();
            }
            catch (MongoConnectionException)
            {
                return null;
            }
        }

        public string GetContainerIdByLoanId(string loanId)
        {
            try
            {
                var collection = GetLoanContainersCollection();
                var foundItems = collection.Find(eachContainer => eachContainer.LoanId == loanId);
                if (foundItems.CountDocuments() != 1)
                {
                    throw new KeyNotFoundException("Item not found");
                }
                return foundItems.First().Id;
            }
            catch (MongoConnectionException)
            {
                return null;
            }
        }

        public List<LoanContainer> GetAllMemberContainers(string memberId, string individualId)
        {
            try
            {
                var collection = GetLoanContainersCollection();
                var foundItems = collection.Find(eachContainer => eachContainer.MemberId == memberId && eachContainer.IndividualId == individualId && eachContainer.LoanApplication != null).ToList();

                foreach (var container in foundItems)
                {
                    MemberIdService.RemoveMemberId(container);
                }
                return foundItems;
            }
            catch (MongoConnectionException)
            {
                return [];
            }
        }

        public List<LoanContainer> GetAllContainers()
        {
            try
            {
                var collection = GetLoanContainersCollection();
                return collection.Find(new BsonDocument()).ToList();
            }
            catch (MongoConnectionException)
            {
                return [];
            }
        }

        public List<LoanContainer> GetLoanContainers(Filter filter)
        {
            try
            {
                var collection = GetLoanContainersCollection().Find(BuildFilter(filter)).Sort(BuildSorter(filter)).Limit(filter.Count).ToList();
                return collection;
            }
            catch (MongoConnectionException)
            {
                return [];
            }
        }

        public void CreateContainer(LoanContainer loanContainer)
        {
            try
            {
                var collection = GetLoanContainersCollection();

                collection.InsertOne(loanContainer);
            }
            catch (Exception e)
            {
                Log.Error(e.Message);
                throw new InvalidDataException("Error occured while creating container");
            }
        }

        public void UpdateContainer(LoanContainer loanContainer)
        {
            try
            {
                var collection = GetLoanContainersCollection();

                ReplaceOneResult result = collection.ReplaceOne(eachLoan => eachLoan.Id == loanContainer.Id, loanContainer);
                if (result.MatchedCount == 0 || result.ModifiedCount == 0)
                {
                    throw new KeyNotFoundException("Item not found");
                }
            }
            catch (KeyNotFoundException en)
            {
                Log.Error(en.Message);
                throw new KeyNotFoundException(en.Message);
            }
            catch (MongoException ex)
            {
                Log.Error(ex.Message);
                throw new InvalidDataException("Error occured while updating container");
            }
            catch (Exception e)
            {
                Log.Error(e.Message);
                throw new InvalidDataException("Error occured while updating container");
            }
        }

        public void DeleteApplication(string id)
        {
            try
            {
                var collection = GetLoanContainersCollection();

                var foundItems = collection.Find(eachContainer => eachContainer.Id == id);
                if (foundItems.CountDocuments() != 1)
                {
                    throw new KeyNotFoundException("Item not found");
                }
                LoanContainer loanContainer = foundItems.First();
                loanContainer.LoanApplication = null;

                ReplaceOneResult result = collection.ReplaceOne(eachContainer => eachContainer.Id == loanContainer.Id, loanContainer);
                if (result.MatchedCount == 0 || result.ModifiedCount == 0)
                {
                    throw new KeyNotFoundException("Item not found");
                }
            }
            catch (KeyNotFoundException en)
            {
                Log.Error(en.Message);
                throw new KeyNotFoundException(en.Message);
            }
            catch (MongoException ex)
            {
                Log.Error(ex.Message);
                throw new InvalidDataException("Error occured while deleting application");
            }
            catch (Exception e)
            {
                Log.Error(e.Message);
                throw new InvalidDataException("Error occured while deleting application");
            }
        }

        public void UpdateStatus(string id, LoanStatus status)
        {
            try
            {
                var collection = GetLoanContainersCollection();

                var foundItems = collection.Find(eachContainer => eachContainer.Id == id);
                if (foundItems.CountDocuments() != 1)
                {
                    throw new KeyNotFoundException("Item not found");
                }
                LoanContainer loanContainer = foundItems.First();
                loanContainer.Status = status;

                ReplaceOneResult result = collection.ReplaceOne(eachContainer => eachContainer.Id == loanContainer.Id, loanContainer);
                if (result.MatchedCount == 0 || result.ModifiedCount == 0)
                {
                    throw new KeyNotFoundException("Item not found");
                }
                if (status == LoanStatus.Vendor_Error || status == LoanStatus.Application_Error)
                {
                    var reportId = id;

                    if ( loanContainer.LoanId != null)
                    {
                        reportId = loanContainer.LoanId;
                    }

                    var contentHtml = "There was a " + status + " in loan application: " + reportId + ". <br><br>";

                    var request = new EmailRequest()
                    {
                        Subject = "Vendor Error In Loan Application",
                        Recipient = _notificationsApiConfiguration.ErrorRecipients,
                        Body = _emailTemplateService.BuildBrandedBody(contentHtml)
                    };

                    _notificationsApiService.SendEmailAsync(request);
                }
            }
            catch (KeyNotFoundException en)
            {
                Log.Error(en.Message);
                throw new KeyNotFoundException(en.Message);
            }
            catch (MongoException ex)
            {
                Log.Error(ex.Message);
                throw new InvalidDataException("Error occured while updating status");
            }
            catch (Exception e)
            {
                Log.Error(e.Message);
                throw new InvalidDataException("Error occured while updating status");
            }
        }

        public void UpdateError(string id, LoanError error)
        {
            try
            {
                var collection = GetLoanContainersCollection();

                var foundItems = collection.Find(eachContainer => eachContainer.Id == id);
                if (foundItems.CountDocuments() != 1)
                {
                    throw new KeyNotFoundException("Item not found");
                }
                LoanContainer loanContainer = foundItems.First();
                loanContainer.Error = error;

                ReplaceOneResult result = collection.ReplaceOne(eachContainer => eachContainer.Id == loanContainer.Id, loanContainer);
                if (result.MatchedCount == 0 || result.ModifiedCount == 0)
                {
                    throw new KeyNotFoundException("Item not found");
                }
            }
            catch (KeyNotFoundException en)
            {
                Log.Error(en.Message);
                throw new KeyNotFoundException(en.Message);
            }
            catch (MongoException ex)
            {
                Log.Error(ex.Message);
                throw new InvalidDataException("Error occured while updating error");
            }
            catch (Exception e)
            {
                Log.Error(e.Message);
                throw new InvalidDataException("Error occured while updating error");
            }
        }

        public void UpdateLoanId(string id, string loanId)
        {
            var collection = GetLoanContainersCollection();
            try
            {
                var foundItems = collection.Find(eachContainer => eachContainer.Id == id);
                if (foundItems.CountDocuments() != 1)
                {
                    throw new KeyNotFoundException("Item not found");
                }
                LoanContainer loanContainer = foundItems.First();
                loanContainer.LoanId = loanId;

                ReplaceOneResult result = collection.ReplaceOne(eachContainer => eachContainer.Id == loanContainer.Id, loanContainer);
                if (result.MatchedCount == 0 || result.ModifiedCount == 0)
                {
                    throw new KeyNotFoundException("Item not found");
                }
            }
            catch (KeyNotFoundException en)
            {
                Log.Error(en.Message);
                throw new KeyNotFoundException(en.Message);
            }
            catch (MongoException ex)
            {
                Log.Error(ex.Message);
                throw new InvalidDataException("Error occured while updating loan id");
            }
            catch (Exception e)
            {
                Log.Error(e.Message);
                throw new InvalidDataException("Error occured while updating loan id");
            }
        }

        public void DeleteContainer(string id)
        {
            var collection = GetLoanContainersCollection();
            try
            {
                DeleteResult result = collection.DeleteOne(_ => _.Id == id);
                if (result.DeletedCount != 1)
                {
                    throw new KeyNotFoundException("Item not found");
                }
            }
            catch (KeyNotFoundException en)
            {
                Log.Error(en.Message);
                throw new KeyNotFoundException(en.Message);
            }
            catch (MongoException ex)
            {
                Log.Error(ex.Message);
                throw new InvalidDataException("Error occured while deleting container");
            }
            catch (Exception e)
            {
                Log.Error(e.Message);
                throw new InvalidDataException("Error occured while deleting container");
            }
        }

        private IMongoCollection<LoanContainer> GetLoanContainersCollection()
        {           
            return _client.GetDatabase().GetCollection<LoanContainer>(_collectionName);
        }

        private static FilterDefinition<LoanContainer> BuildFilter(Filter filter)
        {
            DateTime sDate = filter.StartDate.ToUniversalTime();
            DateTime eDate = filter.EndDate.ToUniversalTime();
            var builder = Builders<LoanContainer>.Filter;
            var filterValue = builder.Gt("Date", sDate) & builder.Lt("Date", eDate);
            for (int i = 0; i < filter.FilterField.Length; i++)
            {
                var field = filter.FilterField[i];
                if (field.NotEqual)
                {
                    filterValue = filterValue & builder.Ne(field.Field, field.FilterValue);
                }
                else if (field.Equal)
                {
                    filterValue = filterValue & builder.Eq(field.Field, field.FilterValue);
                }
                else if (field.GreaterThan)
                {
                    filterValue = filterValue & builder.Gt(field.Field, field.FilterValue);
                }
                else if (field.LessThan)
                {
                    filterValue = filterValue & builder.Lt(field.Field, field.FilterValue);
                }
            }
            return filterValue;
        }

        private static string BuildSorter(Filter filter)
        {
            return "{ " + filter.SortField + ": " + (filter.SortDesc ? "-1}" : "1}");
        }

        #region IDisposable

        public void Dispose()
        {
            this.Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing)
        {
            if (!this.disposed)
            {
                if (disposing)
                {
                }
            }

            this.disposed = true;
        }

        #endregion
    }
}