import os
from pypdf import PdfReader
from config.rag_config import RAGConfig

def load_pdfs(pdf_dir=None):
    pdf_dir = pdf_dir or RAGConfig().pdf_dir
    texts = []
    for filename in os.listdir(pdf_dir):
        if filename.endswith(".pdf"):
            path = os.path.join(pdf_dir, filename)
            reader = PdfReader(path)
            text = "\n".join(page.extract_text() or "" for page in reader.pages)
            texts.append(text)
    return texts

def chunk_text(text, chunk_size=500, overlap=100):
    chunks = []
    start = 0
    while start < len(text):
        end = start + chunk_size
        chunks.append(text[start:end])
        start += chunk_size - overlap
    return chunks