from typing import List, Dict, Any
from dataclasses import dataclass, field, asdict

@dataclass
class Chunk:
    chunk_id: int
    doc_id: str
    text: str
    tokens: int
    topic: str = ""
    domain: str = ""
    task_type: str = ""
    topic_purity: float = 1.0
    summary: str = ""
    keywords: List[str] = field(default_factory=list)
    concepts: List[str] = field(default_factory=list)
    questions: List[str] = field(default_factory=list)