feat: add AI quiz generation endpoint with httpx and OpenAI/Ollama support

classquiz/routers/ai.py

@@ -0,0 +1,40 @@
+# SPDX-FileCopyrightText: 2026 LobotomyLabs
+# SPDX-License-Identifier: MPL-2.0
+
+import os
+import json
+import httpx
+from fastapi import APIRouter, Depends, HTTPException
+from pydantic import BaseModel
+from classquiz.auth import get_current_user
+from classquiz.db.models import User, QuizInput
+
+router = APIRouter()
+
+class AIGenerateRequest(BaseModel):
+    topic: str
+    num_questions: int = 5
+
+@router.post("/generate", response_model=QuizInput)
+async def generate_ai_quiz(req: AIGenerateRequest, user: User = Depends(get_current_user)):
+    api_key = os.getenv("AI_API_KEY", "")
+    base_url = os.getenv("AI_BASE_URL", "https://api.openai.com/v1")
+    model = os.getenv("AI_MODEL", "gpt-4o-mini")
+
+    prompt = f"Generate a quiz about '{req.topic}' with exactly {req.num_questions} multiple-choice questions (ABCD type). Return ONLY valid JSON with keys: title, description, questions (list of {{question, time: '20', type: 'ABCD', answers: [{{answer, right: bool, color}}]}})."
+
+    async with httpx.AsyncClient(timeout=30.0) as client:
+        res = await client.post(
+            f"{base_url}/chat/completions",
+            headers={"Authorization": f"Bearer {api_key}"},
+            json={"model": model, "messages": [{"role": "user", "content": prompt}], "temperature": 0.7},
+        )
+        if res.status_code != 200:
+            raise HTTPException(status_code=502, detail=f"AI provider error: {res.text}")
+        content = res.json()["choices"][0]["message"]["content"].strip()
+        if content.startswith("```"):
+            content = content.split("```")[1]
+            if content.startswith("json"):
+                content = content[4:]
+            content = content.strip("` \n")
+        return QuizInput(**json.loads(content))