from transformers import AutoTokenizer, AutoModelForTokenClassification, pipeline
from typing import List, Dict, Any
import os

class PIINER:
    def __init__(self, model_name: str = "dslim/bert-base-NER"):
        """
        Initialize the HuggingFace NER pipeline using the specified model.
        """
        self.tokenizer = AutoTokenizer.from_pretrained(model_name)
        self.model = AutoModelForTokenClassification.from_pretrained(model_name)
        self.ner_pipeline = pipeline("ner", model=self.model, tokenizer=self.tokenizer, aggregation_strategy="simple")

    def extract_entities(self, text: str) -> List[Dict[str, Any]]:
        """
        Perform NER on the input text and return list of detected entities.
        Each entity includes: entity_group, word, start, end, and score.
        """
        entities = self.ner_pipeline(text)
        return entities