"""PDF-/Bild-Beleg-Import (Phase 5, lokal). Nutzt die Prüf-/Buchungslogik des CSV-Imports."""

from fastapi import APIRouter, Depends, File, Form, HTTPException, UploadFile
from sqlalchemy.orm import Session

from ..database import get_db
from ..deps import get_current_user, get_owned
from ..models import Account, User
from ..services import csv_import, ocr

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


@router.post("/preview")
async def preview(
    file: UploadFile = File(...),
    account_id: int = Form(...),
    db: Session = Depends(get_db),
    user: User = Depends(get_current_user),
) -> dict:
    account = get_owned(db, Account, account_id, user)
    data = await file.read()
    try:
        text = ocr.extract_text(data, file.filename or "", file.content_type or "")
    except ocr.ExtractionError as exc:
        raise HTTPException(status_code=400, detail=str(exc))
    candidates = ocr.parse_transactions(text)
    rows = csv_import.detect_rows(db, user, account, candidates)
    return {
        "rows": rows,
        "text": text[:8000],
        "count": len(rows),
        "filename": file.filename or "",
    }