using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using LCU.API.Internal.RepoApi.Repos.Exceptions;
using LCU.API.Internal.RepoApi.Repos.Models;
using LCU.API.Internal.RepoApi.Repos.Persistence;
using Microsoft.EntityFrameworkCore;
using Serilog;

namespace LCU.API.Internal.RepoApi.Repos.Repositories
{
    public class EventAlertRepository : BaseRepository, IEventAlertRepository
    {
        private const string RepoStatus = "REPO";
        private const string O4RStatus = "O4R";
        private const int ClosedAccountCutoffDays = 90;
        
        private static List<string> _nonRepeatingAlerts = new List<string>
        {
            "Credit Adjustment Received",
            "Debit Adjustment Received",
            "Notice of Plan to Sell Not Found",
            "Notice of Repossession Not Found",
            "RTC Letter Not Found"
        };

        public EventAlertRepository(AppDbContext context) : base(context)
        {
            
        }

        public async Task<IEnumerable<EventAlert>> ListAllAsync()
        {
            return await _context.EventAlerts.ToListAsync();
        }

        public async Task<IEnumerable<EventAlert>> ListUnreadAsync()
        {
            var result = from alert in _context.EventAlerts
                         join repo in _context.RepoAccounts
                         on alert.AccountNo equals repo.AccountNo
                         join activeStatus in _context.RepoManualStatuses
                         on repo.Status equals activeStatus.Description
                         where activeStatus.WatchForStatusChanges && alert.DateMarkedRead == null
                         select alert;

            return await result.Distinct().ToListAsync();
        }

        public async Task<IEnumerable<EventAlert>> ListWithinDateRangeAsync(DateTime start, DateTime end)
        {
            return await _context.EventAlerts.Where(e => e.DateAdded >= start && e.DateAdded <= end).ToListAsync();
        }

        public async Task<IEnumerable<EventAlert>> ListRepoNoAuctionAsync()
        {
            var closedDateCutoff = DateTime.Today.Subtract(TimeSpan.FromDays(ClosedAccountCutoffDays));
            var accountsInRepo = (
                from repo in _context.RepoAccounts
                where repo.Status.Equals(RepoStatus) && (repo.DateClosed == null || repo.DateClosed > closedDateCutoff)
                select repo);

            var accountsInRepoWithAuction = (
                from repo in accountsInRepo
                join auctionAssignment in _context.AuctionAssignments
                on repo.RepoId equals auctionAssignment.RepoId
                where auctionAssignment.IsActive == true
                select repo);

            var accountsNoAuction = await accountsInRepo.Except(accountsInRepoWithAuction).ToListAsync();

            return accountsNoAuction.Select(repo => new EventAlert()
            {
                AccountNo = repo.AccountNo,
                RepoId = repo.RepoId,
                Message = "Repo No Auction"
            }).Distinct();
        }

        public async Task<IEnumerable<EventAlert>> ListRepoNoCompanyAsync()
        {
            return await ListStatusNoCompanyAsync(RepoStatus);
        }

        public async Task<IEnumerable<EventAlert>> ListO4rNoCompanyAsync()
        {
            return await ListStatusNoCompanyAsync(O4RStatus);
        }

        public async Task<IEnumerable<EventAlert>> ListStatusNoCompanyAsync(string status)
        {
            var closedDateCutoff = DateTime.Today.Subtract(TimeSpan.FromDays(ClosedAccountCutoffDays));
            var result = from repo in _context.RepoAccounts
                         from collateral in _context.Collaterals.Where(c => c.RepoId == repo.RepoId)
                         from repoCompanySelection in _context.RepoCompanySelections.Where(x => x.CollateralId == collateral.CollateralId).DefaultIfEmpty()
                         where (repoCompanySelection == null || repoCompanySelection.RepoCompanyId == null) && repo.Status.Equals(status) && (repo.DateClosed == null || repo.DateClosed > closedDateCutoff)
                         select new EventAlert
                         {
                             AccountNo = repo.AccountNo,
                             RepoId = repo.RepoId,
                             Message = status + " No Repo Company"
                         };

            var temp = await result.Distinct().ToListAsync();
            return temp;
        }

        public async Task<IEnumerable<EventAlert>> ListReadyForRetitleAsync()
        {
            var result = from collateral in _context.Collaterals
                         join repo in _context.RepoAccounts
                         on collateral.RepoId equals repo.RepoId
                         join auctionAssignmentToCollateral in _context.AuctionAssignmentToCollaterals
                         on collateral.CollateralId equals auctionAssignmentToCollateral.CollateralId
                         join auctionAssignment in _context.AuctionAssignments
                         on auctionAssignmentToCollateral.AuctionAssignmentId equals auctionAssignment.ID
                         from data in Queryable.Where<ImsAutoFileData>(_context.ImsAutoFileData, ims => auctionAssignment.ID == ims.AuctionAssignmentId ||
                                 (repo.RepoId == ims.RepoId && auctionAssignment.CollateralVIN == ims.VIN))
                         where collateral.RetitledInLandmarkName == null && repo.Status.Equals(RepoStatus) && auctionAssignment.IsActive && repo.RedemptionExpiredDate < DateTime.Today
                         select new EventAlert
                         {
                             AccountNo = repo.AccountNo,
                             RepoId = repo.RepoId,
                             Message = "Ready For Retitle"
                         };

            return await result.Distinct().ToListAsync();
        }

        public async Task<IEnumerable<EventAlert>> ListFloorUpdateFailedAsync()
        {
            var result = from autoFileData in _context.ImsAutoFileData
                         join repo in _context.RepoAccounts
                         on autoFileData.RepoId equals repo.RepoId
                         join collateral in _context.Collaterals
                         on repo.RepoId equals collateral.RepoId
                         join auctionAssignmentToCollateral in _context.AuctionAssignmentToCollaterals
                         on collateral.CollateralId equals auctionAssignmentToCollateral.CollateralId
                         join auctionAssignment in _context.AuctionAssignments
                         on auctionAssignmentToCollateral.AuctionAssignmentId equals auctionAssignment.ID
                         where ((auctionAssignment.HoldStatus ?? 0) == 0 || (auctionAssignment.HoldUntil ?? DateTime.Now) <= DateTime.Now) &&
                               auctionAssignment.RedeemedDate == null &&
                               autoFileData.SoldDate == null &&
                               (auctionAssignment.FloorPriceResponseCode != null && auctionAssignment.FloorPriceResponseCode != 1)
                         select new EventAlert
                         {
                             AccountNo = repo.AccountNo,
                             RepoId = repo.RepoId,
                             Message = "Floor Update Failed"
                         };

            return await result.Distinct().ToListAsync();
        }

        public async Task<IEnumerable<EventAlert>> ListFloorNeedsSettingAsync()
        {
            var result = from data in _context.ImsAutoFileData
                         join repo in _context.RepoAccounts
                         on data.RepoId equals repo.RepoId
                         join collateral in _context.Collaterals
                         on repo.RepoId equals collateral.RepoId
                         join auctionAssignmentToCollateral in _context.AuctionAssignmentToCollaterals
                         on collateral.CollateralId equals auctionAssignmentToCollateral.CollateralId
                         join auctionAssignment in _context.AuctionAssignments
                         on auctionAssignmentToCollateral.AuctionAssignmentId equals auctionAssignment.ID
                         where (auctionAssignment.FloorPrice ?? 0) == 0 &&
                               ((auctionAssignment.HoldStatus ?? 0) == 0 || (auctionAssignment.HoldUntil ?? DateTime.Now) <= DateTime.Now) &&
                               auctionAssignment.RedeemedDate == null &&
                               data.SoldDate == null &&
                               data.ScheduledSaleDate != null &&
                               data.ScheduledSaleDate < DateTime.Now.AddDays(3) &&
                               repo.DateClosed == null
                         select new EventAlert
                         {
                             AccountNo = repo.AccountNo,
                             RepoId = repo.RepoId,
                             Message = "Floor Set Required"
                         };

            return await result.Distinct().ToListAsync();
        }

        public async Task AddAsync(EventAlert eventAlert)
        {
            if (eventAlert.SubMessage != null && eventAlert.SubMessage.Length > 499)
            {
                eventAlert.SubMessage = eventAlert.SubMessage.Substring(0, 499);
            }

            if (!IsDuplicateAlert(eventAlert))
            {
                await _context.EventAlerts.AddAsync(eventAlert);
            }
            else
            {
                throw new DuplicateResourceException("EventAlert");
            }
        }

        public async Task<IEnumerable<EventAlert>> AddRangeAsync(IEnumerable<EventAlert> eventAlerts)
        {
            List<EventAlert> filteredEventAlerts = new List<EventAlert>();

            foreach (EventAlert eventAlert in eventAlerts)
            {
                if (eventAlert.SubMessage != null && eventAlert.SubMessage.Length > 499)
                {
                    eventAlert.SubMessage = eventAlert.SubMessage.Substring(0, 499);
                }

                if (!IsDuplicateAlert(eventAlert))
                {
                    filteredEventAlerts.Add(eventAlert);
                }
                else
                {
                    Log.Debug($"EventAlertRepository: Valid Alert Already Exists eventAlert: {@eventAlert}." +
                        $" Will Continue without adding this to Event Alerts Context.", eventAlerts, eventAlert
                    );
                }
            }

            await _context.EventAlerts.AddRangeAsync(filteredEventAlerts);
            return filteredEventAlerts;
        }

        public bool IsDuplicateAlert(EventAlert eventAlert)
        {
            var duplicateAlerts = (
               from alert in _context.EventAlerts
               where alert.AccountNo == eventAlert.AccountNo &&
                     alert.Message == eventAlert.Message &&
                     (
                       alert.DateMarkedRead == null ||
                       alert.DateMarkedRead > DateTime.Now.AddHours(-24) ||
                       _nonRepeatingAlerts.Contains(alert.Message)
                     )
               select alert
               ).ToList();

            return (duplicateAlerts.Any());
        }

        public async Task<EventAlert> FindByIdAsync(int id)
        {
            return await _context.EventAlerts.FindAsync(id);
        }

        public void Update(EventAlert category)
        {
            _context.EventAlerts.Update(category);
        }

        public void Remove(EventAlert category)
        {
            _context.EventAlerts.Remove(category);
        }

        public async Task<IEnumerable<EventAlert>> ListUnreadByAccountNoAsync(string accountNo)
        {
            var results = _context.EventAlerts.Where(x => x.AccountNo == accountNo && x.DateMarkedRead == null);
            return await results.ToListAsync();
        }
    }
}