import io
import csv
from typing import List, TypeVar

T = TypeVar("T")


class CSVReader:
    rows: List[T] = []

    def __init__(self, items: List[T] = None):
        self.rows.extend(items or [])

    def add_row(self, row):
        self.rows.append(row)

    def read(self, delimiter: str = ","):
        csv_doc = csv.reader(self.rows, delimiter=delimiter)
        return list(csv_doc)

    @staticmethod
    def read_from_file(file: str, delimiter: str = ","):
        with io.StringIO(file) as f:
            csv_doc = csv.reader(f, delimiter=delimiter)
            f.close()
            return list(csv_doc)