from typing import Any, Dict, List
import json

from modules.datamodels.datamodelExtraction import ContentPart
from ..subUtils import makeId
from ..subRegistry import Extractor


class JsonExtractor(Extractor):
    def detect(self, fileName: str, mimeType: str, headBytes: bytes) -> bool:
        return mimeType == "application/json" or (fileName or "").lower().endswith(".json")

    def extract(self, fileBytes: bytes, context: Dict[str, Any]) -> List[ContentPart]:
        mimeType = context.get("mimeType") or "application/json"
        text = fileBytes.decode("utf-8", errors="replace")
        # verify JSON is well-formed; fall back to text if not
        try:
            json.loads(text)
        except Exception:
            pass
        return [ContentPart(
            id=makeId(),
            parentId=None,
            label="main",
            typeGroup="structure",
            mimeType=mimeType,
            data=text,
            metadata={"size": len(fileBytes)}
        )]