from langchain_text_splitters import RecursiveCharacterTextSplitter
from app.config import config
from app.utils.logger import logger


class Chunker:
    def __init__(self):
        chunk_size = config["rag"]["text_splitter"]["chunk_size"]
        chunk_overlap = config["rag"]["text_splitter"]["chunk_overlap"]
        
        self.text_splitter = RecursiveCharacterTextSplitter(
            chunk_size=chunk_size,
            chunk_overlap=chunk_overlap,
            length_function=len,
            is_separator_regex=False
        )
        logger.info(f"Text splitter initialized: chunk_size={chunk_size}, overlap={chunk_overlap}")
    
    def split_text(self, text: str) -> list[str]:
        chunks = self.text_splitter.split_text(text)
        logger.info(f"Split text into {len(chunks)} chunks")
        return chunks
    
    def split_documents(self, documents: list) -> list:
        chunks = self.text_splitter.split_documents(documents)
        logger.info(f"Split {len(documents)} documents into {len(chunks)} chunks")
        return chunks


chunker = Chunker()