using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;

namespace Khd.Core.EntityFramework
{
    public static class DbContextExtensions
    {
        //public static List<T> ExecuteSqlQuery<T>(this DbContext dbContext, string sqlQuery) where T : class
        //{
        //    using var command = dbContext.Database.GetDbConnection().CreateCommand();
        //    command.CommandText = sqlQuery;
        //    command.CommandType = CommandType.Text;

        //    dbContext.Database.OpenConnection();

        //    using var reader = command.ExecuteReader();
        //    var result = new List<T>();

        //    while (reader.Read())
        //    {
        //        var entity = Activator.CreateInstance<T>();
        //        foreach (var prop in typeof(T).GetProperties())
        //        {
        //            var value = reader[prop.Name];
        //            if (value != DBNull.Value)
        //            {
        //                prop.SetValue(entity, value);
        //            }
        //        }
        //        result.Add(entity);
        //    }

        //    return result;
        //}

        public static List<T> ExecuteSqlQuery<T>(this DbContext dbContext, string sqlQuery) where T : class, new()
        {
            using var command = dbContext.Database.GetDbConnection().CreateCommand();
            command.CommandText = sqlQuery;
            command.CommandType = CommandType.Text;

            dbContext.Database.OpenConnection();

            using var reader = command.ExecuteReader();
            var result = new List<T>();

            var columnNames = Enumerable.Range(0, reader.FieldCount).Select(reader.GetName).ToList();

            while (reader.Read())
            {
                var entity = new T();
                var properties = typeof(T).GetProperties();

                foreach (var prop in properties)
                {
                    var propName = prop.Name;
                    if (!columnNames.Contains(propName))
                        continue;

                    var value = reader[propName];
                    if (value != DBNull.Value)
                    {
                        prop.SetValue(entity, value);
                    }
                }

                result.Add(entity);
            }

            return result;
        }
    }

}