using Dapper;
using GB5Shared.DTO.Framework.Criteria;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.QueryExecutor;
using Newtonsoft.Json;
using PayRollDAL.DTO.TDSChallan;
using PayRollDAL.Query.TDSChallan;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.Json;
using System.Threading.Tasks;
using static GB5Shared.GB5Constant.Constant;

namespace PayRollDAL.CustomeCode.TDSChallan
{
    public class TDSChallanDAL : ITDSChallanDAL
    {
        private readonly IQueryExecutor _QueryExecutor;

        public TDSChallanDAL(IQueryExecutor queryExecutor)
        {
            _QueryExecutor = queryExecutor;
        }

        // ── Picklist for grid ─────────────────────────────────────────────

        public async Task<string> GetSelectListTDSChallan(int FirstNumber, int MaxResult, CriteriaDTO CriteriaDTO, LoginDTO LoginDTO, bool IsCount = false)
        {
            string innerSql = LoginDTO.DatabaseType switch
            {
                DBType.SQL => TDSChallanQB.GET_SELECTLIST_TDSCHALLAN_INNER_SQL,
                DBType.PostGre => TDSChallanQB.GET_SELECTLIST_TDSCHALLAN_INNER_PG,
                _ => throw new Exception("Unsupported database type")
            };

            string outerSql = LoginDTO.DatabaseType switch
            {
                DBType.SQL => TDSChallanQB.GET_SELECTLIST_TDSCHALLAN_OUTER_SQL,
                DBType.PostGre => TDSChallanQB.GET_SELECTLIST_TDSCHALLAN_OUTER_PG,
                _ => throw new Exception("Unsupported database type")
            };

            var parameters = new DynamicParameters();

            string challanNumber = GetCriteriaStringValue(CriteriaDTO, "ChallanNumber");
            if (!string.IsNullOrWhiteSpace(challanNumber))
            {
                innerSql += "\r\n AND a.CHALLANNUMBER LIKE @challannumber";
                parameters.Add("challannumber", $"%{challanNumber}%");
            }

            if (IsCount)
            {
                string countSql = $"SELECT COUNT(*) FROM ({innerSql}) AS CountResult";
                var countRows = await _QueryExecutor.QueryAsync<int>(LoginDTO, countSql, parameters).ConfigureAwait(false);
                return countRows.FirstOrDefault().ToString();
            }

            string fullSql = $"WITH PagedTDSChallan AS ({innerSql}) {outerSql}";
            parameters.Add("firstnumber", FirstNumber);
            parameters.Add("maxresult", MaxResult);

            var result = await _QueryExecutor.QueryAsync<TDSChallanPicklistDTO>(LoginDTO, fullSql, parameters).ConfigureAwait(false);
            return JsonConvert.SerializeObject(result);
        }

        private string GetCriteriaStringValue(CriteriaDTO criteriaDTO, string fieldName)
        {
            try
            {
                var attr = criteriaDTO?.SectionCriteriaList?
                    .SelectMany(s => s.AttributesCriteriaList)
                    .FirstOrDefault(a => string.Equals(a.FieldName, fieldName, StringComparison.OrdinalIgnoreCase));

                if (attr?.FieldValue is JsonElement je)
                    return je.ValueKind == JsonValueKind.String ? je.GetString() : je.ToString();

                return attr?.FieldValue?.ToString();
            }
            catch { return null; }
        }
    }
}