# Copyright (c) 2025 Patrick Motsch
# All rights reserved.
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):
    """
    Extractor for JSON files.
    
    Supported formats:
    - MIME types: application/json
    - File extensions: .json
    - Special handling: Validates JSON format, falls back to text if invalid
    """
    
    def detect(self, fileName: str, mimeType: str, headBytes: bytes) -> bool:
        return mimeType == "application/json" or (fileName or "").lower().endswith(".json")
    
    def getSupportedExtensions(self) -> list[str]:
        """Return list of supported file extensions."""
        return [".json"]
    
    def getSupportedMimeTypes(self) -> list[str]:
        """Return list of supported MIME types."""
        return ["application/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)}
        )]