Add lobby MVP endpoints for create/join/session-state

lobby/urls.py

@@ -0,0 +1,8 @@
+from django.urls import path
+from . import views
+
+urlpatterns = [
+    path('create', views.create_session, name='lobby-create-session'),
+    path('join', views.join_session, name='lobby-join-session'),
+    path('state/<str:code>', views.session_state, name='lobby-session-state'),
+]

lobby/views.py

@@ -1,3 +1,79 @@
-from django.shortcuts import render
+import random
+import string
+import json
 
-# Create your views here.
+from django.contrib.auth.decorators import login_required
+from django.http import JsonResponse
+from django.views.decorators.http import require_GET, require_POST
+from django.views.decorators.csrf import csrf_exempt
+
+from fupogfakta.models import GameSession, Player
+
+
+def _session_code(length: int = 6) -> str:
+    alphabet = string.ascii_uppercase + string.digits
+    for _ in range(20):
+        code = ''.join(random.choice(alphabet) for _ in range(length))
+        if not GameSession.objects.filter(code=code).exists():
+            return code
+    raise RuntimeError('Kunne ikke generere unik session-kode')
+
+
+@login_required
+@require_POST
+def create_session(request):
+    session = GameSession.objects.create(host=request.user, code=_session_code())
+    return JsonResponse({'ok': True, 'session': {'code': session.code, 'status': session.status}})
+
+
+@csrf_exempt
+@require_POST
+def join_session(request):
+    try:
+        payload = json.loads(request.body.decode('utf-8'))
+    except Exception:
+        payload = {}
+
+    code = (payload.get('code') or '').strip().upper()
+    nickname = (payload.get('nickname') or '').strip()
+
+    if not code or not nickname:
+        return JsonResponse({'ok': False, 'error': 'Mangler code eller nickname'}, status=400)
+
+    try:
+        session = GameSession.objects.get(code=code)
+    except GameSession.DoesNotExist:
+        return JsonResponse({'ok': False, 'error': 'Ugyldig session-kode'}, status=404)
+
+    if session.status == GameSession.Status.FINISHED:
+        return JsonResponse({'ok': False, 'error': 'Spillet er afsluttet'}, status=409)
+
+    player, _created = Player.objects.get_or_create(session=session, nickname=nickname)
+    player.is_connected = True
+    player.save(update_fields=['is_connected'])
+
+    return JsonResponse({
+        'ok': True,
+        'player': {'id': player.id, 'nickname': player.nickname},
+        'session': {'code': session.code, 'status': session.status},
+    })
+
+
+@require_GET
+def session_state(_request, code: str):
+    code = code.strip().upper()
+    try:
+        session = GameSession.objects.get(code=code)
+    except GameSession.DoesNotExist:
+        return JsonResponse({'ok': False, 'error': 'Ugyldig session-kode'}, status=404)
+
+    players = list(session.players.values('id', 'nickname', 'score', 'is_connected'))
+    return JsonResponse({
+        'ok': True,
+        'session': {
+            'code': session.code,
+            'status': session.status,
+            'current_round': session.current_round,
+        },
+        'players': players,
+    })