using Dto;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using Entities;
using Shared.Mapper;
using DbContextLib;
using Model.OrderCriteria;
using Shared.ModelToEntities;

namespace Shared
{
    public class UserDataService : IUserDataService
    {
        private UserDbContext DbContext { get; set; }

        public UserDataService(UserDbContext context)
        {
            DbContext = context;
            context.Database.EnsureCreated();
        }

        public UserDTO GetUserById(int id)
        {
            var userEntity = DbContext.Users.FirstOrDefault(u => u.Id == id);
            if (userEntity == null)
            {
                throw new ArgumentException("Impossible de trouver l'utilisateur", nameof(id));
            }

            return userEntity.FromEntityToDTO();

        }

        public UserDTO GetUserByUsername(string username)
        {
            var userEntity = DbContext.Users.FirstOrDefault(u => u.Username == username);
            if (userEntity == null)
            {
                throw new ArgumentException("Impossible de trouver l'utilisateur", nameof(username));
            }

            return userEntity.FromEntityToDTO();

        }

        public IEnumerable<UserDTO> GetUsers(int page, int number, UserOrderCriteria orderCriteria)
        {
            IQueryable<UserEntity> query = DbContext.Users.Skip((page - 1) * number).Take(number);
            switch (orderCriteria)
            {
                case UserOrderCriteria.None:
                    break;
                case UserOrderCriteria.ById:
                    query = query.OrderBy(s => s.Id);
                    break;
                case UserOrderCriteria.ByUsername:
                    query = query.OrderBy(s => s.Username);
                    break;
                case UserOrderCriteria.ByEmail:
                    query = query.OrderBy(s => s.Email);
                    break;
                case UserOrderCriteria.ByIsAdmin:
                    query = query.OrderBy(s => s.IsAdmin);
                    break;
                default:
                    break;
            }
            var users = query.ToList();
            return users.Select(s => s.FromEntityToDTO());
        }

        public bool DeleteUser(int id)
        {
            var userEntity = DbContext.Users.FirstOrDefault(u => u.Id == id);
            if (userEntity == null)
            {
                return false;
            }

            DbContext.Users.Remove(userEntity);
            DbContext.SaveChangesAsync();
            return true;

        }

        public UserDTO UpdateUser(int id, UserDTO user)
        {
            var updatingUser = DbContext.Users.FirstOrDefault(u => u.Id == id);
            if (updatingUser == null)
            {
                throw new ArgumentException("Impossible de trouver l'utilisateur", nameof(id));
            }

            updatingUser.Username = user.Username;
            updatingUser.Password = user.Password;
            updatingUser.Email = user.Email;
            updatingUser.IsAdmin = user.IsAdmin;
            DbContext.SaveChangesAsync();
            return updatingUser.FromEntityToDTO();

        }

        public UserDTO CreateUser(string username, string password, string email, bool isAdmin)
        {
            var newUserEntity = new UserDTO
            {
                Username = username,
                Password = password,
                Email = email,
                IsAdmin = isAdmin
            };
            DbContext.Users.Add(newUserEntity.FromDTOToEntity());
            DbContext.SaveChangesAsync();
            return newUserEntity;

        }

        public Task<UserDTO?> AddItem(UserDTO? item)
        {
            throw new NotImplementedException();
        }

        public Task<bool> DeleteItem(int id)
        {
            throw new NotImplementedException();
        }

        public Task<UserDTO> UpdateItem<TDto>(int? id, TDto? newItem) where TDto : class
        {
            throw new NotImplementedException();
        }

        public async Task<IEnumerable<UserDTO>> GetItems(int page, int count, object orderCriteria, string? filter = null, object? valueFilter = null)
        {
            var usersEntities = await DbContext.GetItemsWithFilter<UserEntity>(page, count, orderCriteria, filter, valueFilter);
            return usersEntities.Select(e => e).ToList().Select(e => e.FromEntityToDTO());
        }
    }
}