loader.py

from __future__ import annotations
import json
from typing import List, Tuple, Optional, Dict, Any
from models import Card


def load_cards(path: str) -> Tuple[Optional[str], List[Card]]:
    deckname: Optional[str] = None
    cards: List[Card] = []
    
    try:
        with open(path, 'r', encoding='utf-8') as f:
            payload = f.read().strip()
    except Exception as e:
        raise IOError(f"Failed to read file: {e}")
    
    if not payload:
        return deckname, cards
    
    def handle_object(obj: Dict[str, Any]) -> None:
        nonlocal deckname
        if 'deckname' in obj and deckname is None:
            deckname = str(obj['deckname'])
        else:
            card = Card.from_dict(obj)
            if card and not card.is_empty():
                cards.append(card)
    
    try:
        data = json.loads(payload)
        if isinstance(data, list):
            for obj in data:
                if isinstance(obj, dict):
                    handle_object(obj)
            return deckname, cards
        elif isinstance(data, dict):
            handle_object(data)
            return deckname, cards
    except (json.JSONDecodeError, ValueError):
        pass
    
    for line in payload.splitlines():
        line = line.strip()
        if not line:
            continue
        try:
            obj = json.loads(line)
            if isinstance(obj, dict):
                handle_object(obj)
        except (json.JSONDecodeError, ValueError):
            continue
    
    return deckname, cards