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using OrderCriterias;
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace ManagerInterfaces
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{
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/// <summary>
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/// All methods to handle questions
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/// /!\ all methods returns a task
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/// </summary>
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/// <typeparam name="T">a DTO, Entity or Model question</typeparam>
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public interface IQuestionManager<T>
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{
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/// <summary>
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/// get the number of T element
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/// </summary>
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/// <returns>the number of T element</returns>
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public int getNbElements();
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/// <summary>
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/// add a question
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/// </summary>
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/// <param name="question">the question to add</param>
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/// <returns>the question added</returns>
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public Task<T> addQuestion(T question);
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/// <summary>
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/// delete a T element
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/// </summary>
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/// <param name="question">the question to remove</param>
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/// <returns>
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/// the T element deleted or
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/// null if there isn't any
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/// </returns>
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public Task<T?> removeQuestion(T question);
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/// <summary>
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/// delete a T element with an id
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/// </summary>
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/// <param name="id">the id of the T element</param>
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/// <returns>
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/// the T element deleted that corresponde
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/// to the id or null if there isn't any
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/// </returns>
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public Task<T?> removeQuestion(uint id);
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/// <summary>
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/// get a part of all questions
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/// </summary>
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/// <param name="nb">the actual page</param>
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/// <param name="count">number of T element in a page</param>
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/// <param name="orderCriteria">the order criteria</param>
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/// <returns>
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/// a set of the number of page and
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/// all T element in the database for
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/// the page nb (or null if the page
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/// does not exist (<=> (nb-1)*count outside
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/// boundaries (0, getNbElement()-1)))
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/// </returns>
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public Task<(int nbPages, ReadOnlyCollection<T>? questions)> getQuestions(int nb, int count, QuestionOrderCriteria orderCriteria = QuestionOrderCriteria.ById);
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/// <summary>
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/// get a T element with an id
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/// </summary>
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/// <param name="id">the id of the T element</param>
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/// <returns>
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/// the T element that corresponde
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/// to the id or null if there isn't any
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/// </returns>
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public Task<T?> getQuestion(uint id);
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/// <summary>
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/// modified a T element with an id
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/// </summary>
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/// <param name="id">the id of the T element</param>
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/// <param name="question">an question that contains all modified properties</param>
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/// <returns>
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/// the T element (modified) that corresponde
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/// to the id or null if there isn't any
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/// </returns>
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public Task<T?> updateQuestion(uint id, T question);
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/// <summary>
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/// increase nbFalls of a question by 1
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/// (and change the difficulty of the question)
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/// </summary>
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/// <param name="id">the id of the question</param>
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/// <returns>
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/// the T element (modified) that corresponde
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/// to the id or null if there isn't any
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/// </returns>
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public Task<T?> updateQuestionNbFalls(uint id);
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/// <summary>
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/// add some questions
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/// </summary>
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/// <param name="questions">a set of questions to add</param>
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/// <returns>questions added</returns>
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public Task<T> addQuestions(IEnumerable<T> questions);
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/// <summary>
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/// get a part of all questions for a given chapter and a given difficulty
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/// </summary>
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/// <param name="idChapter">the id of the chapter</param>
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/// <param name="difficulty">the difficulty</param>
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/// <param name="nb">the actual page</param>
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/// <param name="count">number of T element in a page</param>
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/// <param name="orderCriteria">the order criteria</param>
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/// <returns>
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/// a set of the number of page and
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/// all T element in the database for
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/// the page nb (or null if the page
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/// does not exist (<=> (nb-1)*count outside
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/// boundaries (0, getNbElement()-1)))
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/// or null if the chapter does not exist
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/// or the difficulty is not between 1 and 3
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/// </returns>
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public Task<(int nbPages, ReadOnlyCollection<T>? questions)?> getQuestionsByChapterAndDifficulty(int idChapter, int difficulty, int nb, int count, QuestionOrderCriteria orderCriteria = QuestionOrderCriteria.ById);
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}
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}
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