using ApplicationCore.Interfaces.ISpecification;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;

namespace ApplicationCore.Specification.BaseSpecification
{
    public class BaseSpecification<T> : ISpecification<T>  where T :class 
    {
        protected BaseSpecification(Expression<Func<T, bool>> criteria = null )
        {
            Criteria = criteria;
        }
        public Expression<Func<T, bool>> Criteria { get; }
        public List<Expression<Func<T, object>>> Includes { get; } = new List<Expression<Func<T, object>>>();
        public List<String> ThenInclude { get; } = new List<String>();
        public Expression<Func<T, object>> OrderBy { get; private set; }
        public Expression<Func<T, object>> OrderByDescending { get; private set; }

        protected virtual void AddInclude(Expression<Func<T, object>> includeExpression)
        {
            Includes.Add(includeExpression);
        }
        protected virtual void AddThenInclude(String include)
        {
            ThenInclude.Add(include);
        }

        protected virtual void ApplyOrderBy(Expression<Func<T, object>> orderByExpression)
        {
            OrderBy = orderByExpression;
        }
        protected virtual void ApplyOrderByDescending(Expression<Func<T, object>> orderByDescendingExpression)
        {
            OrderByDescending = orderByDescendingExpression;
        }

    }
}
