Refactor admin frontend into modular SPA

frontend/admin/js/views/subjects.js

@@ -0,0 +1,153 @@
+import { api } from '../api.js';
+import { escapeHtml, showAlert, hideAlert } from '../utils.js';
+
+export async function initSubjects() {
+    const subjectsTbody = document.getElementById('subjects-tbody');
+    const createSubjectForm = document.getElementById('create-subject-form');
+
+    const assignTeacherForm = document.getElementById('assign-teacher-form');
+    const assignTeacherSelect = document.getElementById('assign-teacher-select');
+    const assignSubjectSelect = document.getElementById('assign-subject-select');
+    const teacherSubjectsTbody = document.getElementById('teacher-subjects-tbody');
+
+    let allSubjects = [];
+    let allTeachers = [];
+
+    async function loadInitialData() {
+        await Promise.all([loadSubjects(), loadTeachers()]);
+        await loadTeacherSubjects();
+    }
+
+    async function loadSubjects() {
+        try {
+            allSubjects = await api.get('/api/subjects');
+            renderSubjects(allSubjects);
+            populateSubjectSelect(allSubjects);
+        } catch (e) {
+            if (subjectsTbody) subjectsTbody.innerHTML = '<tr><td colspan="3" class="loading-row">Ошибка загрузки</td></tr>';
+        }
+    }
+
+    function renderSubjects(subjects) {
+        if (!subjects || !subjects.length) {
+            subjectsTbody.innerHTML = '<tr><td colspan="3" class="loading-row">Нет дисциплин</td></tr>';
+            return;
+        }
+        subjectsTbody.innerHTML = subjects.map(s => `
+      <tr>
+        <td>${s.id}</td>
+        <td>${escapeHtml(s.name)}</td>
+        <td><button class="btn-delete" data-id="${s.id}">Удалить</button></td>
+      </tr>`).join('');
+    }
+
+    function populateSubjectSelect(subjects) {
+        if (!assignSubjectSelect) return;
+        const currentVal = assignSubjectSelect.value;
+        assignSubjectSelect.innerHTML = '<option value="">Выберите дисциплину</option>' +
+            subjects.map(s => `<option value="${s.id}">${escapeHtml(s.name)}</option>`).join('');
+        if (currentVal && subjects.find(s => s.id == currentVal)) {
+            assignSubjectSelect.value = currentVal;
+        }
+    }
+
+    async function loadTeachers() {
+        try {
+            allTeachers = await api.get('/api/users/teachers');
+            populateTeacherSelect(allTeachers);
+        } catch (e) {
+            if (assignTeacherSelect) assignTeacherSelect.innerHTML = '<option value="">Ошибка загрузки</option>';
+        }
+    }
+
+    function populateTeacherSelect(teachers) {
+        if (!assignTeacherSelect) return;
+        const currentVal = assignTeacherSelect.value;
+        if (!teachers || !teachers.length) {
+            assignTeacherSelect.innerHTML = '<option value="">Нет преподавателей</option>';
+            return;
+        }
+        assignTeacherSelect.innerHTML = '<option value="">Выберите преподавателя</option>' +
+            teachers.map(t => `<option value="${t.id}">${escapeHtml(t.username)}</option>`).join('');
+        if (currentVal && teachers.find(t => t.id == currentVal)) {
+            assignTeacherSelect.value = currentVal;
+        }
+    }
+
+    async function loadTeacherSubjects() {
+        try {
+            const tsData = await api.get('/api/teacher-subjects');
+            renderTeacherSubjects(tsData);
+        } catch (e) {
+            if (teacherSubjectsTbody) teacherSubjectsTbody.innerHTML = '<tr><td colspan="3" class="loading-row">Ошибка загрузки</td></tr>';
+        }
+    }
+
+    function renderTeacherSubjects(tsArray) {
+        if (!tsArray || !tsArray.length) {
+            teacherSubjectsTbody.innerHTML = '<tr><td colspan="3" class="loading-row">Нет привязок</td></tr>';
+            return;
+        }
+        teacherSubjectsTbody.innerHTML = tsArray.map(ts => `
+      <tr>
+        <td>${escapeHtml(ts.username)}</td>
+        <td>${escapeHtml(ts.subjectName)}</td>
+        <td><button class="btn-delete" data-user-id="${ts.userId}" data-subject-id="${ts.subjectId}">Удалить</button></td>
+      </tr>`).join('');
+    }
+
+    createSubjectForm.addEventListener('submit', async (e) => {
+        e.preventDefault();
+        hideAlert('create-subject-alert');
+        const name = document.getElementById('new-subject-name').value.trim();
+        if (!name) { showAlert('create-subject-alert', 'Введите название', 'error'); return; }
+
+        try {
+            const data = await api.post('/api/subjects', { name });
+            showAlert('create-subject-alert', `Дисциплина "${escapeHtml(data.name)}" добавлена`, 'success');
+            createSubjectForm.reset();
+            loadSubjects();
+        } catch (e) { showAlert('create-subject-alert', e.message || 'Ошибка создания', 'error'); }
+    });
+
+    subjectsTbody.addEventListener('click', async (e) => {
+        const btn = e.target.closest('.btn-delete');
+        if (!btn) return;
+        if (!confirm('Удалить дисциплину?')) return;
+        try {
+            await api.delete('/api/subjects/' + btn.dataset.id);
+            loadSubjects();
+            loadTeacherSubjects(); // May have deleted a subject that was assigned
+        } catch (e) { alert(e.message || 'Ошибка удаления'); }
+    });
+
+    assignTeacherForm.addEventListener('submit', async (e) => {
+        e.preventDefault();
+        hideAlert('assign-teacher-alert');
+        const userId = assignTeacherSelect.value;
+        const subjectId = assignSubjectSelect.value;
+        if (!userId) { showAlert('assign-teacher-alert', 'Выберите преподавателя', 'error'); return; }
+        if (!subjectId) { showAlert('assign-teacher-alert', 'Выберите дисциплину', 'error'); return; }
+
+        try {
+            await api.post('/api/teacher-subjects', { userId: Number(userId), subjectId: Number(subjectId) });
+            showAlert('assign-teacher-alert', 'Привязка создана', 'success');
+            loadTeacherSubjects();
+        } catch (e) { showAlert('assign-teacher-alert', e.message || 'Ошибка привязки', 'error'); }
+    });
+
+    teacherSubjectsTbody.addEventListener('click', async (e) => {
+        const btn = e.target.closest('.btn-delete');
+        if (!btn) return;
+        if (!confirm('Удалить привязку?')) return;
+        try {
+            await api.delete('/api/teacher-subjects', {
+                userId: Number(btn.dataset.userId),
+                subjectId: Number(btn.dataset.subjectId)
+            });
+            loadTeacherSubjects();
+        } catch (e) { alert(e.message || 'Ошибка удаления'); }
+    });
+
+    loadInitialData();
+}