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from fastapi import APIRouter, Depends, HTTPException, BackgroundTasks
from sqlalchemy.orm import Session
from typing import List, Dict
import asyncio
from datetime import datetime
from api.auth import get_current_user
from models import db_models
from models.schemas import FlashcardGenerateRequest, FlashcardSetResponse, FlashcardResponse
from core.database import get_db, SessionLocal
from api.websocket_routes import manager
from services.flashcard_service import flashcard_service
from core import constants
router = APIRouter(prefix="/api/flashcards", tags=["flashcards"])
logger = logging.getLogger(__name__)
async def run_flashcard_generation(set_id: int, request: FlashcardGenerateRequest, user_id: int):
"""Background task for flashcard generation"""
db = SessionLocal()
connection_id = f"user_{user_id}"
try:
db_set = db.query(db_models.FlashcardSet).filter(db_models.FlashcardSet.id == set_id).first()
if not db_set: return
# Call AI service
cards_data = await flashcard_service.generate_flashcards(
file_key=request.file_key,
text_input=request.text_input,
difficulty=request.difficulty,
quantity=request.quantity,
topic=request.topic,
language=request.language,
progress_callback=lambda p, m: asyncio.create_task(
manager.send_progress(connection_id, p, "processing", m)
)
)
if not cards_data:
raise Exception("AI returned empty flashcards data")
# Save individual cards
for item in cards_data:
db_card = db_models.Flashcard(
flashcard_set_id=db_set.id,
question=item.get("question", ""),
answer=item.get("answer", "")
)
db.add(db_card)
db_set.status = "completed"
db.commit()
# Notify via WebSocket
await manager.send_result(connection_id, {
"type": "flashcards",
"id": db_set.id,
"status": "completed",
"title": db_set.title
})
except Exception as e:
logger.error(f"Background flashcard generation failed: {e}")
db_set = db.query(db_models.FlashcardSet).filter(db_models.FlashcardSet.id == set_id).first()
if db_set:
db_set.status = "failed"
db_set.error_message = str(e)
db.commit()
await manager.send_error(connection_id, f"Flashcard generation failed: {str(e)}")
finally:
db.close()
@router.get("/config")
async def get_flashcard_config():
"""Returns available difficulties, quantities, and languages for flashcards."""
return {
"difficulties": constants.DIFFICULTIES,
"quantities": constants.FLASHCARD_QUANTITIES,
"languages": constants.LANGUAGES
}
@router.post("/generate", response_model=FlashcardSetResponse)
async def generate_flashcards(
request: FlashcardGenerateRequest,
background_tasks: BackgroundTasks,
current_user: db_models.User = Depends(get_current_user),
db: Session = Depends(get_db)
):
"""
Initiates flashcard generation in the background.
"""
source_id = None
if request.file_key:
source = db.query(db_models.Source).filter(
db_models.Source.s3_key == request.file_key,
db_models.Source.user_id == current_user.id
).first()
if not source:
raise HTTPException(status_code=403, detail="Not authorized to access this file")
source_id = source.id
# Create initial processing record
file_base = request.file_key.split('/')[-1].rsplit('.', 1)[0] if request.file_key else None
# Priority: 1. File-based name, 2. User Topic (if not default 'string'), 3. Default timestamp
if file_base:
title = f"Flashcard-{file_base}"
elif request.topic and request.topic != "string":
title = request.topic
else:
title = f"Flashcards {datetime.utcnow().strftime('%Y-%m-%d %H:%M')}"
db_set = db_models.FlashcardSet(
title=title,
difficulty=request.difficulty,
user_id=current_user.id,
source_id=source_id,
status="processing"
)
db.add(db_set)
db.commit()
db.refresh(db_set)
# Offload to background task
background_tasks.add_task(run_flashcard_generation, db_set.id, request, current_user.id)
return db_set
@router.get("/sets", response_model=List[FlashcardSetResponse])
async def list_flashcard_sets(
current_user: db_models.User = Depends(get_current_user),
db: Session = Depends(get_db)
):
"""
Lists all flashcard sets for the current user.
"""
try:
sets = db.query(db_models.FlashcardSet).filter(
db_models.FlashcardSet.user_id == current_user.id
).order_by(db_models.FlashcardSet.created_at.desc()).all()
return [FlashcardSetResponse.model_validate(s) for s in sets]
except Exception as e:
raise HTTPException(status_code=500, detail=str(e))
@router.get("/set/{set_id}", response_model=FlashcardSetResponse)
async def get_flashcard_set(
set_id: int,
current_user: db_models.User = Depends(get_current_user),
db: Session = Depends(get_db)
):
"""
Retrieves a specific flashcard set.
"""
db_set = db.query(db_models.FlashcardSet).filter(
db_models.FlashcardSet.id == set_id,
db_models.FlashcardSet.user_id == current_user.id
).first()
if not db_set:
raise HTTPException(status_code=404, detail="Flashcard set not found")
return FlashcardSetResponse.model_validate(db_set)
@router.get("/explain")
async def explain_flashcard(
question: str,
file_key: str = None,
language: str = "English",
current_user: db_models.User = Depends(get_current_user)):
"""
Provides a detailed explanation for a specific question.
"""
try:
explanation = await flashcard_service.generate_explanation(
question=question,
file_key=file_key,
language=language
)
return {"explanation": explanation}
except Exception as e:
logger.error(f"Explanation failed: {e}")
raise HTTPException(status_code=500, detail=str(e))
@router.delete("/set/{set_id}")
async def delete_flashcard_set(
set_id: int,
current_user: db_models.User = Depends(get_current_user),
db: Session = Depends(get_db)
):
"""
Deletes a specific flashcard set and all its cards.
"""
db_set = db.query(db_models.FlashcardSet).filter(
db_models.FlashcardSet.id == set_id,
db_models.FlashcardSet.user_id == current_user.id
).first()
if not db_set:
raise HTTPException(status_code=404, detail="Flashcard set not found")
db.delete(db_set)
db.commit()
return {"message": "Flashcard set and all associated cards deleted successfully"}
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