elkay: lesson.py and teacher link

phase/Student_view/teacherlink.py

@@ -70,6 +70,18 @@ def _student_assignments_for_class(student_id: int, class_id: int):
     except Exception:
         return []
 
+def _mark_assignment_started(student_id: int, assignment_id: int):
+    if USE_LOCAL_DB and hasattr(dbapi, "mark_assignment_started"):
+        return dbapi.mark_assignment_started(student_id, assignment_id)
+    return api.mark_assignment_started(student_id, assignment_id)
+
+def _set_assignment_progress(student_id: int, assignment_id: int, current_pos: int = 1, progress: float = 0.05):
+    # optional nudge so the bar is not 0
+    if USE_LOCAL_DB and hasattr(dbapi, "set_assignment_progress"):
+        return dbapi.set_assignment_progress(student_id, assignment_id, current_pos, progress)
+    return api.set_assignment_progress(student_id, assignment_id, current_pos, progress)
+
+
 # --- UI ---
 
 def show_code():
@@ -204,16 +216,24 @@ def show_code():
                     with c1:
                         # pass lesson & assignment to the Lessons page
                         if st.button("▶️ Start Lesson", key=f"start_lesson_{r.get('assignment_id')}"):
-                            st.session_state.selected_lesson = int(r.get("lesson_id"))          # keep for backward compat
-                            st.session_state.selected_assignment = int(r.get("assignment_id"))  # keep for backward compat
-
-                            # New explicit route hint. This is what fixes your navigation.
+                            lesson_id = int(r.get("lesson_id"))
+                            assignment_id = int(r.get("assignment_id"))
+
+                            # Tell backend we started
+                            try:
+                                _mark_assignment_started(student_id, assignment_id)
+                                _set_assignment_progress(student_id, assignment_id, current_pos=1, progress=0.05)
+                            except Exception as e:
+                                st.warning(f"Could not mark as started yet. Continuing anyway. {e}")
+
+                            # Route intent
+                            st.session_state.selected_lesson = lesson_id
+                            st.session_state.selected_assignment = assignment_id
                             st.session_state.lesson_route = {
                                 "source": "teacher",
-                                "lesson_id": int(r.get("lesson_id")),
-                                "assignment_id": int(r.get("assignment_id") or 0),
+                                "lesson_id": lesson_id,
+                                "assignment_id": assignment_id,
                             }
-
                             st.session_state.current_page = "Lessons"
                             st.rerun()
                     with c2:

utils/api.py

@@ -318,6 +318,14 @@ def delete_lesson(lesson_id: int, teacher_id: int):
     d = _req("DELETE", f"/lessons/{lesson_id}", json={"teacher_id": teacher_id}).json()
     return bool(d.get("ok", True)), d.get("message", "")
 
+def mark_assignment_started(student_id: int, assignment_id: int):
+    return _req("POST", f"/assignments/{assignment_id}/start").json()
+
+def set_assignment_progress(student_id: int, assignment_id: int, current_pos: int, progress: float):
+    return _req("PATCH", f"/assignments/{assignment_id}/progress",
+                json={"current_pos": current_pos, "progress": progress}).json()
+
+
 # Quizzes
 def list_quizzes_by_teacher(teacher_id: int):
     return _json_or_raise(_req("GET", f"/teachers/{teacher_id}/quizzes"))
@@ -657,4 +665,16 @@ def tutor_explain(lesson_id: int, level_slug: str, wrong: list[dict]):
         "wrong": wrong
     }, timeout=60)
     r.raise_for_status()
-    return r.json()["feedback"]
+    return r.json()["feedback"]
+
+@app.post("/assignments/{assignment_id}/start")
+def start_assignment(assignment_id: int, student=Depends(auth_student)):
+    db.mark_assignment_started(student.id, assignment_id)
+    return {"ok": True}
+
+@app.patch("/assignments/{assignment_id}/progress")
+def update_progress(assignment_id: int, payload: dict, student=Depends(auth_student)):
+    db.set_assignment_progress(student.id, assignment_id,
+                               payload.get("current_pos", 0),
+                               payload.get("progress", 0.0))
+    return {"ok": True}