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;
using Church.Net.DAL.EFCoreDBF.Interface;

namespace Church.Net.DAL.EFCoreDBF.Core
{
    public class CrudDALCBase<T> : ICrudDAL<T> where T : class, IEntity, new()
    {
        private readonly DatabaseOptions databaseOptions;

        //private readonly ChurchNetContext dbContext;

        public CrudDALCBase(DatabaseOptions databaseOptions)
        {
            this.databaseOptions = databaseOptions;
            //this.dbContext = databaseOptions.GetDbContext();
        }
        public virtual IQueryable<T> InitQuery(ChurchNetContext dbContext)
        {
            return dbContext.Set<T>();
        }
        public ChurchNetContext GetDbContext()
        {
            //var result = (DbSet<T>)typeof(ChurchNetContext).GetMethod("Set").MakeGenericMethod(typeof(T)).Invoke(dbContext, null);

            return databaseOptions.GetDbContext();//.Set<T>().AsNoTracking();
            //return result;
        }

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

        public virtual T GetById(string Id)
        {
            using (var dbContext = GetDbContext())
            {
                return InitQuery(dbContext).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)
        {
            using (var dbContext = GetDbContext())
            {
                return InitQuery(dbContext).Where(filter ?? (s => true)).ToList();
            }
            //var dbObjs = GetDbContext().ToArray();

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

        }

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

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

                //var list = new List<T>();

                return InitQuery(dbContext).Where(e => RowIds.Any(id => id == e.Id)).ToArray();
            }
        }
        private bool needGenId(T entity)
        {

            return string.IsNullOrWhiteSpace(entity.Id) || entity.Id.Length <= 3;

        }
        public virtual int Create(T entity)
        {
            if (needGenId(entity))
            {
                entity.Id = StringHelper.Get33BaseGuid();
            }

            ConvertUTCTime(entity);

            using (var dbContext = GetDbContext())
            {
                dbContext.Add(entity);

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

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

        public int CreateOrUpdate(T entity)
        {
            ConvertUTCTime(entity);


            using (var dbContext = GetDbContext())
            {
                if (CheckExist(entity))
                {
                    dbContext.Update(entity);
                }
                else
                {
                    if (needGenId(entity))
                    {
                        entity.Id = StringHelper.Get33BaseGuid();
                    }
                    dbContext.Add(entity);
                }
                return dbContext.SaveChanges();
            }

        }

        public virtual int Update(T entity)
        {
            using (var dbContext = GetDbContext())
            {
                //var dbObj = this.InitQuery(dbContext).Any(e => e.Id == entity.Id);
                if (!InitQuery(dbContext).Any(e => e.Id == entity.Id))
                {
                    throw new ArgumentNullException("the Id is not exist.");
                }
                ConvertUTCTime(entity);

                dbContext.Update(entity);

                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)
            {
                ConvertUTCTime(entity);
            }
            using (var dbContext = GetDbContext())
            {
                dbContext.UpdateRange(entities);

                return dbContext.SaveChanges();
            }
        }

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

        public int Delete(Func<T, bool> filter)
        {
            using (var dbContext = GetDbContext())
            {

                var list = InitQuery(dbContext).Where(filter).ToList();
                if (list.Count > 0)
                {
                    dbContext.RemoveRange(list);
                    return dbContext.SaveChanges();
                }
                return 0;
            }
        }

        public virtual bool CheckExist(T obj)
        {
            using (var dbContext = GetDbContext())
            {
                return InitQuery(dbContext).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 localTime = (DateTime)prop.GetValue(entity);
                    if (localTime.Kind != DateTimeKind.Utc)
                    {
                        localTime = new DateTime(localTime.Year, localTime.Month, localTime.Day,
                            localTime.Hour, localTime.Minute, localTime.Second,
                            localTime.Millisecond, DateTimeKind.Local);
                    }
                    var offset = TimeZone.CurrentTimeZone.GetUtcOffset(DateTime.Now);
                    var OutputTime = DateTime.SpecifyKind(localTime - offset, DateTimeKind.Utc);
                    DateTime utcTime = localTime.ToUniversalTime();
                    prop.SetValue(entity, utcTime, null);

                }
                else if (prop.PropertyType == typeof(DateTime?))
                {
                    DateTime? localTime = (DateTime?)prop.GetValue(entity);
                    if (localTime.HasValue)
                    {
                        if (localTime.Value.Kind != DateTimeKind.Utc)
                        {
                            //localTime = DateTime.SpecifyKind(localTime.Value, DateTimeKind.Local);
                            localTime = new DateTime(localTime.Value.Year, localTime.Value.Month, localTime.Value.Day,
                                localTime.Value.Hour, localTime.Value.Minute, localTime.Value.Second,
                                localTime.Value.Millisecond, DateTimeKind.Local);
                        }

                        DateTime? utcTime = localTime.Value.ToUniversalTime();
                        prop.SetValue(entity, utcTime, null);
                    }
                }
            }
        }

        public IQueryable<T> GetDbSet()
        {
            return databaseOptions.GetDbContext().Set<T>().AsNoTracking();
        }
    }


}