using KanSan.DataStoring.Contract;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Linq.Expressions;
using System.Text;

namespace DataStoring.EF
{
    public class Repository<TEntity> : IRepository<TEntity> where TEntity : class
    {
        private readonly KanSanContext _db;
        private readonly DbSet<TEntity> dbSet;

        public IQueryable<TEntity> Query => dbSet;

        public Repository(KanSanContext db)
        {
            _db = db;
            this.dbSet = db.Set<TEntity>();
        }
        public virtual void Delete(TEntity entityToDelete)
        {
            if (_db.Entry(entityToDelete).State == EntityState.Detached)
                dbSet.Attach(entityToDelete);
            dbSet.Remove(entityToDelete);
        }

        public void Delete(int id)
        {
            try
            {
                var entity = _db.Set<TEntity>().Find(id);
                if(entity == null)
                {
                    throw new Exception("Id not found");
                }
            }
            catch(Exception e)
            {
                throw new Exception("Cant delete id");
            }

        }

        public IEnumerable<TEntity> GetAll(string include)
        {
            return dbSet.Include(include);
        }

        public IEnumerable<TEntity> Get(Expression<Func<TEntity, bool>> filter = null, Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null, string includeProperties = "")
        {
            IQueryable<TEntity> query = dbSet;


            if (filter != null)
            {
                query = query.Where(filter);
            }

            if (includeProperties != null)
            {
                foreach (var includeProperty in includeProperties.Split
                (new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
                {
                    query = query.Include(includeProperty);
                }
            }


            if (orderBy != null)
            {
                return orderBy(query).ToList();
            }
            else
            {
                return query.ToList();
            }
        }

        public TEntity GetByID(object id)
        {
            return dbSet.Find(id);
        }

        public virtual void Insert(TEntity entity)
        {
            _db.Set<TEntity>().Add(entity);
            _db.SaveChanges();
            
        }

        public IQueryable<TEntity> Include(params Expression<Func<TEntity, object>>[] includeExpressions)
        {
            IQueryable<TEntity> query = null;
            foreach (var include in includeExpressions)
            {
                query = dbSet.Include(include);
            }
            return query ?? dbSet;
        }

        public void Update(TEntity entity)
        {
            _db.Entry(entity).State = EntityState.Modified;
            _db.SaveChanges();
        }
    }
}