using Microsoft.EntityFrameworkCore;
using System.Collections.Generic;
using System.Transactions;
using System;
using Church.Net.DAL.EF;
using System.Linq;
using Church.Net.Utility;
using System.Threading.Tasks;
using Church.Net.Entity.Interface;

namespace Church.Net.DAL.EFCoreDBF
{
    public class CrudDALCBase<T> : ICrudDAL<T> where T : class, Church.Net.Entity.Interface.IEntity, new()
    {
        private readonly ChurchNetContext dbContext;

        public CrudDALCBase(ChurchNetContext dbContext)
        {
            this.dbContext = dbContext;
        }
        public DbSet<T> GetDbSet()
        {
            //var result = (DbSet<T>)typeof(ChurchNetContext).GetMethod("Set").MakeGenericMethod(typeof(T)).Invoke(dbContext, null);

            return (DbSet<T>)dbContext.Set<T>();
            //return result;
        }

        public virtual T First(Func<T, bool> filter = null)
        {
            return GetDbSet().Where(filter ?? (s => true)).FirstOrDefault();
        }

        public virtual T GetById(string Id)
        {
            return GetDbSet().FirstOrDefault(e => e.Id == Id);
        }

        //public virtual T GetByRefndx(string refndx)
        //{
        //    return MapDBModelToEntity(GetFirstDBModelByRefndx<ST>(refndx, this.actionScreen));
        //}

        public virtual IEnumerable<T> GetAll(Func<T, bool> filter = null)
        {
            //var dbObjs = GetDbSet().ToArray();

            //IEnumerable<T> list = GetDbSet().Where(filter ?? (s => true)).ToList();

            return GetDbSet().Where(filter ?? (s => true)).ToList();
        }

        public virtual IEnumerable<T> GetAllById(IEnumerable<string> Ids)
        {
            var RowIds = Ids.Select(i => i.ToString());

            //return GetDbSet().Where(e => RowIds.Any(id => id == e.Id));

            //var list = new List<T>();
            var dbObjs = GetDbSet().Where(e => RowIds.Any(id => id == e.Id)).ToArray();

            return dbObjs.ToList();
        }
        public virtual int Create(T entity)
        {
            if (string.IsNullOrEmpty(entity.Id))
            {
                entity.Id = StringHelper.Get33BaseGuid();
            }

            this.ConvertUTCTime(entity);
            dbContext.Add(entity);

            return dbContext.SaveChanges();
        }
        public virtual Task<int> CreateAsync(T entity)
        {
            int result = 0;
            this.ConvertUTCTime(entity);
            if (string.IsNullOrEmpty(entity.Id))
            {
                entity.Id = StringHelper.Get33BaseGuid();
            }
            T newDbObj = new T();
            if (newDbObj != null)
            {
                //AfterCreatMapping(entity, newDbObj);
                //newDbObj.RowId = entity.Id.ToString();
                //result = Add(newDbObj) ? 1 : 0;
            }
            dbContext.Add(entity);

            //CreateDone(entity, newDbObj);
            return dbContext.SaveChangesAsync();
        }
        public virtual string CreateReturnId(T entity)
        {
            this.ConvertUTCTime(entity);
            if (Create(entity) > 0)
            {
                return entity.Id;
            }
            else
            {
                return null;
            };
        }

        public int CreateOrUpdate(T entity, out string id)
        {
            id = null;
            this.ConvertUTCTime(entity);
            if (CheckExist(entity))
            {
                dbContext.Update(entity);
            }
            else
            {
                if (string.IsNullOrEmpty(entity.Id))
                {
                    entity.Id = StringHelper.Get33BaseGuid();
                }
                id = entity.Id;
                dbContext.Add(entity);
            }
            return dbContext.SaveChanges();
        }

        public virtual int Update(T entity)
        {

            var dbObj = GetDbSet().FirstOrDefault(e => e.Id == entity.Id);
            if (dbObj == null)
            {
                throw new ArgumentNullException("the Id is not exist.");
            }
            this.ConvertUTCTime(entity);

            dbContext.Update(dbObj);

            return dbContext.SaveChanges();


        }
        public virtual void CreateDone(T entity)
        {

        }
        public virtual void UpdateDone(T entity)
        {

        }

        public virtual int UpdateRange(IEnumerable<T> entities)
        {
            foreach (var entity in entities)
            {
                this.ConvertUTCTime(entity);
            }
            dbContext.UpdateRange(entities);

            return dbContext.SaveChanges();
        }

        public virtual int Delete(T obj)
        {
            dbContext.Remove(GetDbSet().FirstOrDefault(e => e.Id == obj.Id.ToString()));
            return dbContext.SaveChanges();
        }

        public int Delete(Func<T, bool> filter)
        {
            var list = GetDbSet().Where(filter).ToList();
            if (list.Count > 0)
            {
                dbContext.RemoveRange(list);
                return dbContext.SaveChanges();
            }
            return 0;
        }

        public virtual bool CheckExist(T obj)
        {
            return GetDbSet().Any(e => e.Id == obj.Id);
        }

        private void ConvertUTCTime(T entity)
        {

            var props = typeof(T).GetProperties();
            foreach (var prop in props)
            {
                if (prop.PropertyType == typeof(DateTime))
                {
                    //do stuff like prop.SetValue(t, DateTime.Now, null);
                    DateTime utcTime = ((DateTime)prop.GetValue(entity)).ToUniversalTime();
                    prop.SetValue(entity, utcTime, null);

                }
            }
        }
    }


}