\documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath, amsfonts, amssymb, amsthm}
\usepackage{tikz}

\author{Debucquoy Anthony}
\title{Extension messagerie}

\begin{document}

\section{Use case diagram}

\begin{center}
\resizebox{390pt}{!}{
	\input{./use_case_messagerie.tex}
}
\end{center}

\subsection{Answer topic}

The user should be able to answer to a topic created by a teacher.
This answer will depend on the type of topic. The answer could be a selection on a poll,
a private answer (which mean that the answer is not visible to the other users except to the professor).
The answer could finally be a basic answer to the topic and be visible to other users browsing the topic.

\subsection{Create discutions}

The user can select multiple users and group them into a discussion.
In this discussion, users will be able to exchange messages readable by
every other members of the discussion

\subsubsection{Send messages}

Allow the creation of a message in a discussion.
The text sent to others shall be received by other users
and these users shall be notified of this message by the notification
system.

\subsection{Ask appointment}

A student can ask for an appointment to a teacher.
In this request, the student will have to give a date, a time
and a subject he want to propose to the teacher.

\subsubsection{Export to calendar}

When an appointment is made. The program can export the event
to an open format that can be read by calendar software to add
the event to the user's calendar.

\subsection{Manage appointment}

When a teacher received an appointment, he is able to
validate, deny or propose a new appointment schedule to the
student.

\subsubsection{Propose new appointment}

If the teacher can't attend to an appointment because of his
schedule, he can make a new time proposal and send it to
the student. The student then receive a notification of
the proposed modifications.

\subsection{Create forum}

The teacher can create a new forum under a specific course
The new forum will then make every student of this course
follow the forum and its topic.

\subsubsection{Post topics}

The teacher can post a new topic inside a forum to let 
the student know of something specific or to ask a question to
them.

\subsubsection{Post poll}

When posting a topic to a forum, the teacher can choose to
make the post as a poll. In that case, student will have to vote
for one of the options or if allowed by the teacher, create a new option.

\end{document}
