using Interfaces;
using System;
using System.CodeDom;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DAL.Repositories
{
    public class EFRepository<TEntity> : IRespository<TEntity>
        where TEntity : class
    {
        protected DbContext RepositoryDbContext;
        protected DbSet<TEntity> RepositoryDbSet;

        public EFRepository(DbContext dbContext)
        {
            if (dbContext == null)
            {
                throw new ArgumentNullException(nameof(dbContext));
            }
            RepositoryDbContext = dbContext;
            RepositoryDbSet = dbContext.Set<TEntity>();
            if (RepositoryDbSet == null)
            {
                throw new NullReferenceException(nameof(RepositoryDbSet));
            }
        }

        public List<TEntity> All
        {
            get
            {
                var resCount = RepositoryDbSet.Count();
                if (resCount < 10)
                {
                    return RepositoryDbSet.ToList();
                } 
                throw new Exception("To many records in result set. Custom data access method needed");
            }
        }
        public TEntity Find(int id)
        {
            RepositoryDbSet.Find(id);
        }

        public void Remove(int id)
        {
            Remove(Find(id));
        }

        public void Remove(TEntity entity)
        {
            RepositoryDbSet.Remove(entity);
        }

        public TEntity Add(TEntity entity)
        {
            return RepositoryDbSet.Add(entity);
        }

        public void Update(TEntity entity)
        {
            RepositoryDbSet.Attach(entity);
        }

        public int SaveChanges()
        {
            return RepositoryDbContext.SaveChanges();
        }
    }
}