Add report generation

routes/report.js

@@ -2,7 +2,11 @@
 
 const express = require('express');
 const router = express.Router();
+const { stringify } = require('csv-stringify');
 
+const Class = require('../lib/Class');
+const Student = require('../lib/Student');
+const Test = require('../lib/Test');
 const User = require('../lib/User');
 
 const validator = require('../lib/validator');
@@ -96,9 +100,94 @@ router.post('/report/generate', async (req, res) => {
 		return res.status(400).json({ status: 'Invalid' });
 	}
 
-	fields.get('type');
+	let data;
+	let filename;
 
-	return res.redirect('/admin/reports');
+	switch (fields.get('type')) {
+		case 'student': {
+			const s = await new Student(
+				req.db,
+				fields.get('target'));
+			const trs = await s.getTestResults();
+
+			data = trs.map(tr =>
+				({
+					'Test Name': tr.test.template.name,
+					'Class': tr.test.class.name,
+					'Test Date': tr.test
+						.getDateString(false),
+					'Max Mark': tr.test.template.maxMark,
+					'Mark': tr.mark,
+					'Percentage': `${tr.percentage}%`,
+					'Grade': tr.grade
+				})
+			);
+
+			filename = s.shortName;
+
+			break;
+		}
+		case 'class': {
+			const c = await new Class(req.db, fields.get('target'));
+			const ts = await c.getTests({ range: 'before' });
+
+			data = await Promise.all(ts.map(async t => {
+				const [
+					trs,
+					avgPer,
+					avgScore
+				] = await Promise.all([
+					t.getTestResults(),
+					t.getAveragePercentage(),
+					t.getAverageScore()
+				]);
+
+				return {
+					'Test Name': t.template.name,
+					'Test Date': t.getDateString(false),
+					'Max Mark': t.template.maxMark,
+					'Results Submitted': `${trs.length}/` +
+						t.class.studentIds.length +
+						'\t',
+					'Average score': avgScore,
+					'Average percentage': `${avgPer}%`
+				};
+			}));
+
+			filename = c.name;
+
+			break;
+		}
+		case 'test': {
+			const t = await new Test(req.db, fields.get('target'));
+			const trs = await t.getTestResults();
+
+			data = trs.map(tr =>
+				({
+					'Student': tr.student.fullName,
+					'Test Date': tr.test
+						.getDateString(false),
+					'Max Mark': tr.test.template.maxMark,
+					'Mark': tr.mark,
+					'Percentage': `${tr.percentage}%`,
+					'Grade': tr.grade
+				})
+			);
+
+			filename = `${t.class.name}-${t.template.name}`;
+
+			break;
+		}
+	}
+
+	res.setHeader('Content-Type', 'text/csv');
+	res.setHeader('Content-Disposition',
+		`attachment; filename="stratos-report-${filename}.csv"`);
+	res.setHeader('Cache-Control', 'no-cache');
+	res.setHeader('Pragma', 'no-cache');
+
+	stringify(data, { header: true })
+		.pipe(res);
 });
 
 module.exports = {