using OrderCriterias;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ManagerInterfaces
{
    /// <summary>
    /// All methods to handle lobbies
    /// /!\ all methods returns a task
    /// </summary>
    /// <typeparam name="T">a DTO, Entity or Model lobby</typeparam>
    public interface ILobbyManager<T>
    {
        /// <summary>
        /// get the number of T element
        /// </summary>
        /// <returns>the number of T element</returns>
        public int getNbElements();
        /// <summary>
        /// add a lobby
        /// </summary>
        /// <param name="lobby">the lobby to add</param>
        /// <returns>the lobby added</returns>
        public Task<T> addLobby(T lobby);
        /// <summary>
        /// delete a T element
        /// </summary>
        /// <param name="lobby">the lobby to remove</param>
        /// <returns>
        /// the T element deleted or
        /// null if there isn't any
        /// </returns>
        public Task<T?> removeLobby(T lobby);
        /// <summary>
        /// delete a T element with an id
        /// </summary>
        /// <param name="id">the id of the T element</param>
        /// <returns>
        /// the T element deleted that corresponde
        /// to the id or null if there isn't any
        /// </returns>
        public Task<T?> removeLobby(uint id);
        /// <summary>
        /// get a part of all lobbies
        /// </summary>
        /// <param name="nb">the actual page</param>
        /// <param name="count">number of T element in a page</param>
        /// <param name="orderCriteria">the order criteria</param>
        /// <returns>
        /// a set of the number of page and
        /// all T element in the database for
        /// the page nb (or null if the page
        /// does not exist (<=> (nb-1)*count outside
        /// boundaries (0, getNbElement()-1)))
        /// </returns>
        public Task<(int nbPages, IEnumerable<T>? lobbies)> getLobbies(int nb, int count, LobbyOrderCriteria orderCriteria = LobbyOrderCriteria.ById);
        /// <summary>
        /// get a T element with an id
        /// </summary>
        /// <param name="id">the id of the T element</param>
        /// <returns>
        /// the T element that corresponde
        /// to the id or null if there isn't any
        /// </returns>
        public Task<T?> getLobby(uint id);
    }
}