import csv
from pathlib import Path

class CSVDataLoader:
    def __init__(self, filename: str):
        self.path = Path(filename)

    def load_qa_pairs(self) -> list[str]:
        docs = []
        with self.path.open(encoding="utf-8") as f:
            reader = csv.DictReader(f)
            for row in reader:
                q = row.get("question", "").strip()
                a = row.get("answer", "").strip()
                if q and a:
                    docs.append(f"Q: {q}\nA: {a}")
        return docs