Feat: Ajout stats athlètes

front_end/src/utils/athleteUtils.tsx

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+import { Athlete, Session } from '../classes';
+
+export interface StatsAthlete {
+    nbSessions: number;
+    nbSessionsPerWeek: number;
+    isAlerte: boolean;
+    distributions: Map<string, number>; //le nom de l'activité et son nombre
+}
+
+export function niveauAlerte(stats: StatsAthlete, seuilCritique = 0, seuilMax = 0) {
+    if (stats.nbSessionsPerWeek > seuilMax) return "Alerte ! Niveau maximal atteint.";
+    if (stats.nbSessionsPerWeek > seuilCritique) return "Attention! Niveau critique atteint.";
+    return "Normal";
+}
+
+export function calculStatsAthlete(sessions: Session[], athlete: Athlete, debut: Date, fin: Date): StatsAthlete {
+    let nb_sessions = 0;
+    let nb_semaine = 1; //forcément une semaine 
+    const distributions: Map<string, number> = new Map();
+    const timeDiff = Math.abs(fin.getTime() - debut.getTime());
+    nb_semaine = Math.ceil(timeDiff / (1000 * 3600 * 24 * 7));
+
+    sessions.forEach(session => {
+        //  verification session dans l'intervalle
+        if (session.creneau < debut || session.creneau > fin) return;
+
+        // verification athlete dans session
+        if (!session.athletes.some(a => a.id === athlete.id)) return;
+
+        //incrementation (verifie si recurent ou non)
+        const increment = session.isRecurrent ? nb_semaine : 1;
+        nb_sessions += increment;
+
+    }
+    );
+
+    const nbSessionsPerWeek = nb_sessions / nb_semaine;
+    const isAlerte = nbSessionsPerWeek > 8;
+
+    return {
+        nbSessions: nb_sessions,
+        nbSessionsPerWeek: nbSessionsPerWeek,
+        isAlerte: isAlerte,
+        distributions: distributions
+    };
+}