using Dapper;
using GB5Shared.DTO.Framework.Criteria;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.QueryExecutor;
using Newtonsoft.Json;
using PayRollDAL.DTO.WorkLoad;
using PayRollDAL.Query.WorkLoad;
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.WorkLoad
{
    public class WorkLoadDAL : IWorkLoadDAL
    {
        private readonly IQueryExecutor _QueryExecutor;

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

        // ── Picklist for grid ─────────────────────────────────────────────
        // GB4 parity: WorkLoadDAL.GetSelectListWorkLoad — filtered by the caller's OU + Tenant

        public async Task<string> GetSelectListWorkLoad(int FirstNumber, int MaxResult, CriteriaDTO CriteriaDTO, LoginDTO LoginDTO, bool IsCount = false)
        {
            string searchText = GetCriteriaStringValue(CriteriaDTO, "WorkLoadingVersion");
            var parameters = new DynamicParameters();
            parameters.Add("searchtext", string.IsNullOrWhiteSpace(searchText) ? null : $"%{searchText}%");
            parameters.Add("ouid", LoginDTO.WorkOUId);
            parameters.Add("tenantid", LoginDTO.ClientId);

            if (IsCount)
            {
                string countSql = LoginDTO.DatabaseType switch
                {
                    DBType.SQL => WorkLoadQB.GET_SELECTLIST_WORKLOAD_COUNT_SQL,
                    DBType.PostGre => WorkLoadQB.GET_SELECTLIST_WORKLOAD_COUNT_PG,
                    _ => throw new Exception("Unsupported database type")
                };

                var countRows = await _QueryExecutor.QueryAsync<int>(LoginDTO, countSql, parameters).ConfigureAwait(false);
                return countRows.FirstOrDefault().ToString();
            }

            string sql = LoginDTO.DatabaseType switch
            {
                DBType.SQL => WorkLoadQB.GET_SELECTLIST_WORKLOAD_SQL,
                DBType.PostGre => WorkLoadQB.GET_SELECTLIST_WORKLOAD_PG,
                _ => throw new Exception("Unsupported database type")
            };

            parameters.Add("firstnumber", FirstNumber);
            parameters.Add("maxresult", MaxResult);

            var result = await _QueryExecutor.QueryAsync<WorkLoadPicklistDTO>(LoginDTO, sql, 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; }
        }
    }
}