using Microsoft.EntityFrameworkCore;
using ProRestaurant.DBContexts;
using ProRestaurant.Models.Accounts;
using ProRestaurant.Models.Restaurants;
using System.Collections.Generic;
using System.Linq;

namespace ProRestaurant.Repository.Restaurants
{
    public interface IRestaurantRoleRepository
    {
        List<RestaurantRole> GetRoles(int restaurantId);
        RestaurantRole GetRole(int id);
        RestaurantRolePremission GetPremission(int id);
        void Insert(RestaurantRole Role);
        void Update(RestaurantRole Role);
        void Delete(RestaurantRole Role);
        void Save();
    }

    public class RestaurantRoleRepository : IRestaurantRoleRepository
    {
        private readonly DBContext dBContext;

        public RestaurantRoleRepository(DBContext db)
        {
            dBContext = db;
        }

        public void Delete(RestaurantRole Role)
        {
            dBContext.Remove(Role);
            Save();
        }

        public RestaurantRolePremission GetPremission(int id)
        {
            var prem = dBContext.RestaurantRolePremissions.Where(p => p.Id == id).FirstOrDefault();

            if (prem == null)
            {
                prem = new RestaurantRolePremission();
            }

            return prem;
        }

        public RestaurantRole GetRole(int id)
        {
            var role = dBContext.RestaurantRoles.Include("Permissions").Where(r => r.Id == id).FirstOrDefault();

            if (role == null)
            {
                role = new RestaurantRole
                {
                    Permissions = new List<RestaurantRolePremission>(),
                    Users = new List<User>()
                };
            }
            else
            {
                var userIDs = dBContext.RestaurantUserRestaurantRoles.Where(r => r.RestaurantRoleId == role.Id).Select(r => r.UserId).ToList();
                role.Users = dBContext.Users.Where(u => userIDs.Contains(u.Id)).ToList();
            }

            return role;
        }

        public List<RestaurantRole> GetRoles(int restaurantId)
        {
            return dBContext.RestaurantRoles.Where(r => r.RestaurantId == restaurantId).ToList();
        }

        public void Insert(RestaurantRole Role)
        {
            var users = Role.Users;
            Role.Users = null;

            dBContext.Add(Role);
            Save();

            foreach (var user in users)
            {
                var userRole = new RestaurantUserRestaurantRole
                {
                    UserId = user.Id,
                    RestaurantRoleId = Role.Id
                };
                dBContext.Add(userRole);
            }
            Save();
        }

        public void Save()
        {
            dBContext.SaveChanges();
        }

        public void Update(RestaurantRole Role)
        {
            var prems = Role.Permissions;
            Role.Permissions = null;

            var users = Role.Users;
            Role.Users = null;

            var usersList = dBContext.RestaurantUserRestaurantRoles.Where(r => r.RestaurantRoleId == Role.Id).Select(r => r.UserId).ToList();
            var userObjectList = users.Select(u => u.Id).ToList();

            foreach(var user in users)
            {
                if (!usersList.Contains(user.Id))
                {
                    var userRole = new RestaurantUserRestaurantRole
                    {
                        UserId = user.Id,
                        RestaurantRoleId = Role.Id
                    };
                    dBContext.Add(userRole);
                }
            }

            var remove = dBContext.RestaurantUserRestaurantRoles.Where(r => r.RestaurantRoleId == Role.Id && !userObjectList.Contains(r.UserId.Value)).ToList();
            foreach (var rem in remove)
            {
                dBContext.Remove(rem);
            }
            

            foreach (var prem in prems)
            {
                if (prem.Id == 0)
                {
                    prem.RoleId = Role.Id;
                    dBContext.Add(prem);
                }
                else
                {
                    dBContext.Entry(prem).State = EntityState.Modified;
                }
            }

            dBContext.Entry(Role).State = EntityState.Modified;
            Save();
        }
    }
}