from typing import Optional

def chunk_text(
    text:        str,
    chunk_size:  int = 512,
    overlap:     int = 50,
    separator:   str = "\n"
) -> list[dict]:
    """
    Text in ueberlappende Chunks aufteilen
    chunk_size:  Max Zeichen pro Chunk
    overlap:     Ueberlappung zwischen Chunks
    separator:   Trennzeichen fuer saubere Splits
    """
    # Zuerst an Separatoren splitten
    paragraphs = text.split(separator)
    chunks     = []
    current    = ""
    index      = 0

    for para in paragraphs:
        if len(current) + len(para) > chunk_size and current:
            chunks.append({
                "text":  current.strip(),
                "index": index,
                "start": text.find(current.strip()),
            })
            # Overlap: letzten Teil behalten
            current = current[-overlap:] + para
            index  += 1
        else:
            current += separator + para

    if current.strip():
        chunks.append({
            "text":  current.strip(),
            "index": index,
            "start": text.find(current.strip()),
        })

    return chunks