using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using GB5Shared.DTO.Framework.Criteria;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.GB5Exception;
using GB5Shared.QueryExecutor;
using GB5Shared.Resource.Response;
using GB5Shared.Validation;
using MarketingDAL.DTO.LeadSource;
using MarketingDAL.Query.LeadSource;
using Newtonsoft.Json;

namespace MarketingDAL.CustomCode.LeadSource
{
    public class LeadSourceDAL : ILeadSourceDAL
    {
        private readonly IQueryExecutor _QueryExecutor;
        private readonly IValidation _Validation;

        public LeadSourceDAL(IQueryExecutor QueryExecutor, IValidation Validation)
        {
            _QueryExecutor = QueryExecutor;
            _Validation = Validation;
        }

        public async Task<string> GetLeadSource(int LeadSourceId, LoginDTO LoginDTO)
        {
            try
            {
                var sql = LeadSourceQB.GET_LEADSOURCE;
                var parameters = new { leadsourceid = LeadSourceId };

                var LeadSourceDict = new Dictionary<int, LeadSourceDTO>();

                var result = await _QueryExecutor.QueryMultiMapAsync<LeadSourceDTO, LeadSourceDetailDTO, LeadSourceDTO>(
                    LoginDTO,
                    sql,
                    (parent, child) =>
                    {
                        if (!LeadSourceDict.TryGetValue(parent.LeadSourceId, out var existingParent))
                        {
                            existingParent = parent;
                            existingParent.LeadSourceDetailArray = new List<LeadSourceDetailDTO>();
                            LeadSourceDict[parent.LeadSourceId] = existingParent;
                        }

                        if (child != null && child.LeadSourceDetailId != 0)
                        {
                            existingParent.LeadSourceDetailArray.Add(child);
                        }

                        return existingParent;
                    },
                    parameters,
                    splitOn: "LeadSourceDETAILID"
                );

                var finalResult = LeadSourceDict.Values.FirstOrDefault();
                return JsonConvert.SerializeObject(finalResult);
            }
            catch (Exception ex)
            {
                throw new Exception($"Failed to retrieve LeadSource: {ex.Message}", ex);
            }
        }

        public async Task<string> GetSelectListLeadSource(CriteriaDTO CriteriaDTO, LoginDTO LoginDTO)
        {
            try
            {
                string SQL = LeadSourceQB.GET_SELECTLIST_LEADSOURCE;
                var Result = await _QueryExecutor.QueryAsync<LeadSourcePicklistDTO>(LoginDTO, SQL, null!);
                string Json = JsonConvert.SerializeObject(Result);
                return Json;
            }
            catch (Exception)
            {
                throw;
            }
        }



        public async Task<int> SaveLeadSource(LeadSourceDTO LeadSourceDTO, LoginDTO LoginDTO)
        {
            try
            {
                // SQL Server queries only
                string LeadSourceSql = LeadSourceQB.SAVE_LEADSOURCE;
                string detailSql = LeadSourceQB.SAVE_LEADSOURCE_DETAIL;
                string countSql = LeadSourceQB.GET_LEADSOURCE_COUNT;

                // DUPLICATE CHECK
                int existingCount = await _QueryExecutor.ExecuteScalarAsync<int>(LoginDTO, countSql,
                    new
                    {
                        LeadSourceDTO.LeadSourceId
                    });

                if (existingCount > 0)
                {
                    throw new MethodNotAllowedException(
                        "Duplicate LeadSource record exists."
                    );
                }

                // TRANSACTION BUILD
                var statements = new List<(string sql, object param)>
        {
            (LeadSourceSql, LeadSourceDTO)
        };

                if (LeadSourceDTO.LeadSourceDetailArray?.Count > 0)
                {
                    foreach (var detail in LeadSourceDTO.LeadSourceDetailArray)
                    {
                        detail.LeadSourceId = LeadSourceDTO.LeadSourceId;
                        statements.Add((detailSql, detail));
                    }
                }

                await _QueryExecutor.ExecuteInTransactionAsync(LoginDTO, statements);

                return LeadSourceDTO.LeadSourceId;
            }
            catch (Exception ex)
            {
                throw new Exception(
                    $"{ErrorResponse.SaveErrorMessage}: {ex.Message}", ex);
            }
        }


        public async Task<int> UpdateLeadSource(LeadSourceDTO LeadSourceDTO, LoginDTO login)
        {
            var statements = new List<(string sql, object param)>();
            statements.Add((LeadSourceQB.UPDATE_LEADSOURCE, LeadSourceDTO));

            foreach (var d in LeadSourceDTO.LeadSourceDetailArray)
            {
                d.LeadSourceId = LeadSourceDTO.LeadSourceId;
                if (d.LeadSourceDetailId == 0)
                    statements.Add((LeadSourceQB.SAVE_LEADSOURCE_DETAIL, d));
                else
                    statements.Add((LeadSourceQB.UPDATE_LEADSOURCE_DETAIL, d));
            }

            await _QueryExecutor.ExecuteInTransactionAsync(login, statements);
            return LeadSourceDTO.LeadSourceId;
        }

        public async Task<int> DeleteLeadSourceDetail(int LeadSourceId, LoginDTO LoginDTO)
        {
            try
            {
                return await _QueryExecutor.ExecuteAsync(
                    LoginDTO,
                    LeadSourceQB.DELETE_LEADSOURCE_DETAIL,
                    new { leadsourceid = LeadSourceId }
                );
            }
            catch (Exception ex)
            {
                throw new Exception($"Error while deleting LeadSource detail for ID {LeadSourceId}", ex);
            }
        }


        public async Task<int> DeleteLeadSource(int LeadSourceId, LoginDTO LoginDTO)
        {
            try
            {
                return await _QueryExecutor.ExecuteAsync(
                    LoginDTO,
                    LeadSourceQB.DELETE_LEADSOURCE,
                    new { leadsourceid = LeadSourceId }
                );
            }
            catch (Exception ex)
            {
                throw new Exception($"Error while deleting LeadSource with ID {LeadSourceId}", ex);
            }
        }

    }
}