using System;
using System.Collections.Generic;
using System.Linq;
using LCU.API.Collections.RepoApi.Domain.Extensions;
using LCU.API.Collections.RepoApi.Domain.Processing;
using LCU.API.Collections.RepoApi.Extensions;
using LCU.Shared.Collections.RepoApiLib.Models;

namespace LCU.API.Collections.RepoApi.Domain.AlertChecker
{
    public class AuctionVinDifferentChecker : IAlertChecker
    {
        public List<EventAlert> CheckForAlert(RepoAccountProcessingSlip slip)
        {
            var newEventAlerts = new List<EventAlert>();
            var repoManagerVins = slip.UpdatedRepoAccount.GetCollateralVinList();
            foreach (var auctionAssignment in slip.AuctionAssignments)
            {
                if (auctionAssignment?.AutoIMS?.VIN != null
                    && !repoManagerVins.Contains(auctionAssignment.AutoIMS.VIN.Trim().ToUpper()))
                {
                    newEventAlerts.Add(
                        new EventAlert()
                        {
                            RepoId = slip.UpdatedRepoAccount.RepoId,
                            AccountNo = slip.UpdatedRepoAccount.AccountNo,
                            Message = "Auction VIN Different",
                            SubMessage = FormatSubMessage(auctionAssignment.AutoIMS.VIN.Trim().ToUpper(), repoManagerVins),
                            CreatedBy = "Batch",
                            DateAdded = DateTime.Now
                        }
                    );
                }
            }

            return newEventAlerts.Count > 0 ? newEventAlerts : null;
        }

        private static string FormatSubMessage(string auctionAssignmentVin, IReadOnlyCollection<string> vins)
        {
            if (vins.Count() == 1)
            {
                return
                    $"Auction Assignment VIN: {auctionAssignmentVin} differs from RepoManager VIN: {vins.First()}";
            }

            var repoVins = vins.Aggregate((x, y) => x + ", " + y);
            return $"Auction Assignment VIN: {auctionAssignmentVin} is not among RepoManager VINs: {repoVins}";
        }
    }
}