Maxim Dolgolyov
be4d43105e
Node.js/Express backend + vanilla JS frontend. Features: real-time collaborative whiteboard (SSE), multi-page support, LaTeX formulas, shapes/connectors, coordinate systems, number lines, compass, zoom/pan, Catmull-Rom pencil smoothing, ruler/protractor with rotation & resize controls, minimap navigation overlay, auto-measurements, multi-page thumbnails sidebar, PNG export, page templates. Student/teacher workflows: classes, assignments, library, dashboard. Mobile responsive. SQLite (better-sqlite3). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
81 lines
3.0 KiB
JavaScript
81 lines
3.0 KiB
JavaScript
const db = require('../db/db');
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function teacherOverview(req, res) {
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const user = req.user;
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const classId = req.query.classId ? Number(req.query.classId) : null;
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const classes = user.role === 'admin'
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? db.prepare('SELECT id, name FROM classes ORDER BY name').all()
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: db.prepare('SELECT id, name FROM classes WHERE teacher_id = ? ORDER BY name').all(user.id);
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if (!classId) return res.json({ classes, data: null });
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if (user.role !== 'admin') {
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const cls = db.prepare('SELECT id FROM classes WHERE id = ? AND teacher_id = ?').get(classId, user.id);
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if (!cls) return res.status(403).json({ error: 'Forbidden' });
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}
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const overview = db.prepare(`
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SELECT
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COUNT(DISTINCT cm.user_id) AS students,
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COUNT(DISTINCT CASE WHEN ts.status='completed' THEN ts.id END) AS sessions,
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ROUND(AVG(CASE WHEN ts.status='completed' AND ts.total>0
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THEN ts.score*100.0/ts.total END), 1) AS avgScore
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FROM class_members cm
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LEFT JOIN test_sessions ts ON ts.user_id = cm.user_id
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WHERE cm.class_id = ?
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`).get(classId);
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const scoreByWeek = db.prepare(`
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SELECT
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strftime('%Y-W%W', ts.finished_at) AS week,
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ROUND(AVG(ts.score*100.0/ts.total), 1) AS avg,
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COUNT(*) AS sessions
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FROM test_sessions ts
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JOIN class_members cm ON cm.user_id = ts.user_id AND cm.class_id = ?
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WHERE ts.status='completed' AND ts.total>0
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AND ts.finished_at >= datetime('now','-56 days')
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GROUP BY week ORDER BY week
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`).all(classId);
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const hardQuestions = db.prepare(`
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SELECT q.id, q.text, q.difficulty,
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COUNT(ua.id) AS attempts,
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ROUND(SUM(CASE WHEN ua.is_correct=0 THEN 1.0 ELSE 0 END)*100/COUNT(ua.id),1) AS errorRate,
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t.name AS topic
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FROM user_answers ua
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JOIN questions q ON q.id = ua.question_id
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JOIN test_sessions ts ON ts.id = ua.session_id
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JOIN class_members cm ON cm.user_id = ts.user_id AND cm.class_id = ?
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LEFT JOIN topics t ON t.id = q.topic_id
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WHERE ts.status='completed'
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GROUP BY q.id HAVING attempts >= 3
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ORDER BY errorRate DESC LIMIT 10
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`).all(classId);
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const heatmap = db.prepare(`
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SELECT date(ts.started_at) AS day,
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COUNT(DISTINCT ts.user_id) AS students,
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COUNT(ts.id) AS sessions
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FROM test_sessions ts
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JOIN class_members cm ON cm.user_id = ts.user_id AND cm.class_id = ?
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WHERE ts.started_at >= datetime('now','-90 days')
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GROUP BY day ORDER BY day
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`).all(classId);
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const assignments = db.prepare(`
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SELECT a.id, a.title, a.deadline,
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COUNT(DISTINCT cm.user_id) AS total,
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COUNT(DISTINCT CASE WHEN ass.session_id IS NOT NULL THEN ass.user_id END) AS done
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FROM assignments a
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JOIN class_members cm ON cm.class_id = a.class_id
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LEFT JOIN assignment_sessions ass ON ass.assignment_id=a.id AND ass.user_id=cm.user_id
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WHERE a.class_id = ?
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GROUP BY a.id ORDER BY a.created_at DESC LIMIT 10
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`).all(classId);
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res.json({ classes, overview, scoreByWeek, hardQuestions, heatmap, assignments });
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}
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module.exports = { teacherOverview };
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