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

namespace LCU.API.Collections.RepoApi.Domain.AlertChecker
{
    public class StatusChangeChecker : IAlertChecker
    {
        private readonly string _watchStatus;
        private readonly IEnumerable<string> _fromStatusList;
        private const string NoStatus = "";

        public StatusChangeChecker(string watchStatus, IEnumerable<string> fromStatusList = null)
        {
            _watchStatus = watchStatus.Trim().ToUpper();
            _fromStatusList = fromStatusList;
        }

        public List<EventAlert> CheckForAlert(RepoAccountProcessingSlip slip)
        {
            var originalStatus = slip.ExistingRepoAccount?.Status.ToUpper().Trim();
            var updatedStatus = slip.UpdatedRepoAccount.Status.ToUpper().Trim();

            // new account.
            if (originalStatus == null)
            {
                originalStatus = NoStatus;
            }

            if (updatedStatus == _watchStatus
                && originalStatus != _watchStatus
                && (_fromStatusList == null || _fromStatusList.Contains(originalStatus)))
            {
                return new List<EventAlert>
                {
                    new EventAlert()
                    {
                        RepoId = slip.UpdatedRepoAccount.RepoId,
                        AccountNo = slip.UpdatedRepoAccount.AccountNo,
                        Message = "Status Changed to " + _watchStatus,
                        SubMessage =
                            $"Previously {originalStatus}. I confirm that I have updated the Status to {updatedStatus} in RDN.",
                        CreatedBy = "Batch",
                        DateAdded = DateTime.Now
                    }
                };
            }

            return null;
        }
    }
}