import csv
from datetime import datetime
from typing import List
from ..ir import TaxLot


def read_taxlots_from_csv(path: str) -> List[TaxLot]:
    """Read a simple CSV with headers: id,acquisition_date,basis,quantity,market_value

    Returns list of TaxLot. This adapter is intentionally minimal for Phase-0.
    """
    lots = []
    with open(path, newline="") as f:
        rdr = csv.DictReader(f)
        for row in rdr:
            acq = row.get("acquisition_date")
            acq_date = datetime.strptime(acq, "%Y-%m-%d").date() if acq else None
            lot = TaxLot(
                id=row.get("id"),
                acquisition_date=acq_date,
                basis=float(row.get("basis", 0)),
                quantity=float(row.get("quantity", 0)),
                market_value=float(row.get("market_value")) if row.get("market_value") else None,
            )
            lots.append(lot)
    return lots