# app/api/v1/export.py
from fastapi import APIRouter, Depends, HTTPException, Query
from fastapi.responses import StreamingResponse
from sqlalchemy.orm import Session
from typing import Optional

from app.api import deps
from app.services.export_service import ExportService

router = APIRouter(prefix="/export", tags=["export"])

@router.get("/forms/{form_id}/csv")
async def export_form_csv(
    form_id: int,
    format: str = Query("csv", regex="^(csv|xlsx)$"),
    db: Session = Depends(deps.get_db)
):
    """Экспорт данных формы в CSV или Excel"""
    service = ExportService(db)
    try:
        file_content, filename, media_type = service.export_form_data(form_id, format)
        return StreamingResponse(
            iter([file_content]),
            media_type=media_type,
            headers={"Content-Disposition": f"attachment; filename={filename}"}
        )
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Export failed: {str(e)}")