from __future__ import annotations

import csv
from dataclasses import dataclass
from pathlib import Path


@dataclass(frozen=True)
class MeasurementSeries:
    headers: list[str]
    rows: list[dict[str, str]]


class HeliosImportService:
    def import_csv(self, path: Path) -> MeasurementSeries:
        with path.open(newline="", encoding="utf-8-sig") as handle:
            reader = csv.DictReader(handle)
            return MeasurementSeries(headers=reader.fieldnames or [], rows=list(reader))