feat: teacher get, post en delete route

backend/src/controllers/teachers.ts

@@ -0,0 +1,79 @@
+import { Request, Response } from 'express';
+import {
+    createTeacher, deleteTeacher,
+    fetchAllTeachers, fetchTeacherByUsername
+} from '../services/teachers.js';
+import {TeacherDTO} from "../interfaces/teacher";
+
+export async function getTeacherHandler(req: Request, res: Response): Promise<void> {
+    try {
+        const full = req.query.full === 'true';
+        const username = req.query.username as string;
+
+        if (username){
+            const teacher = await fetchTeacherByUsername(username);
+            if (!teacher){
+                res.status(404).json({ error: `Teacher with username '${username}' not found.` });
+                return;
+            }
+            res.json(teacher);
+            return;
+        }
+
+        let teachers: TeacherDTO[] | string[] = await fetchAllTeachers();
+
+        if (!full)
+            teachers = teachers.map((teacher) => teacher.username)
+
+        res.json(teachers);
+    } catch (error) {
+        console.error("❌ Error fetching teachers:", error);
+        res.status(500).json({ error: "Internal server error" });
+    }
+}
+
+export async function createTeacherHandler(
+    req: Request,
+    res: Response
+): Promise<void> {
+    try {
+        const teacherData = req.body as TeacherDTO;
+
+        if (!teacherData.username || !teacherData.firstName || !teacherData.lastName) {
+            res.status(400).json({ error: 'Missing required fields: username, firstName, lastName' });
+            return;
+        }
+
+        const newTeacher = await createTeacher(teacherData);
+        res.status(201).json(newTeacher);
+    } catch (error) {
+        console.error('Error creating teacher:', error);
+        res.status(500).json({ error: 'Internal server error' });
+    }
+}
+
+export async function deleteTeacherHandler(
+    req: Request,
+    res: Response
+): Promise<void> {
+    try {
+        const username = req.params.username as string;
+
+        if (!username) {
+            res.status(400).json({ error: 'Missing required field: username' });
+            return;
+        }
+
+        const deletedTeacher = await deleteTeacher(username);
+
+        if (!deletedTeacher) {
+            res.status(400).json({ error: `Did not find teacher with username ${username}` });
+            return;
+        }
+
+        res.status(201).json(deletedTeacher);
+    } catch (error) {
+        console.error('Error deleting teacher:', error);
+        res.status(500).json({ error: 'Internal server error' });
+    }
+}