Много разных изменений

frontend/admin/js/academic-period.js

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+import { preferredScheduleSemester } from './schedule-period.js';
+
+export function academicYearsFromSemesters(semesters = []) {
+    const years = new Map();
+    semesters.forEach(semester => {
+        const id = String(semester?.academicYearId ?? '');
+        if (!id || years.has(id)) return;
+        years.set(id, {
+            id,
+            title: semester.academicYearTitle || `Учебный год ${id}`
+        });
+    });
+    return [...years.values()];
+}
+
+export function semestersForAcademicYear(semesters = [], academicYearId = '') {
+    return semesters.filter(semester =>
+        String(semester?.academicYearId ?? '') === String(academicYearId)
+    );
+}
+
+export function resolveAcademicPeriod(semesters = [], options = {}) {
+    if (!semesters.length) return { academicYearId: '', semesterId: '' };
+
+    const requestedSemester = semesters.find(semester =>
+        String(semester.id) === String(options.semesterId || '')
+    );
+    const availableYearIds = new Set(academicYearsFromSemesters(semesters).map(year => year.id));
+    const requestedYearId = availableYearIds.has(String(options.academicYearId || ''))
+        ? String(options.academicYearId)
+        : '';
+    const preferred = preferredScheduleSemester(semesters, options.date || isoToday()) || semesters[0];
+    const academicYearId = requestedSemester
+        ? String(requestedSemester.academicYearId)
+        : (requestedYearId || String(preferred?.academicYearId || semesters[0].academicYearId));
+    const yearSemesters = semestersForAcademicYear(semesters, academicYearId);
+    const semester = requestedSemester && String(requestedSemester.academicYearId) === academicYearId
+        ? requestedSemester
+        : (preferredScheduleSemester(yearSemesters, options.date || isoToday()) || yearSemesters[0]);
+
+    return {
+        academicYearId,
+        semesterId: String(semester?.id || '')
+    };
+}
+
+function isoToday() {
+    const date = new Date();
+    const offset = date.getTimezoneOffset() * 60_000;
+    return new Date(date.getTime() - offset).toISOString().slice(0, 10);
+}