#!/usr/bin/env python3
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"""Implementation of the DataHandlerFactory class to create a CSVHandler object and return it."""

import sys
from pathlib import Path

from yaml import YAMLError

from ...helpers.click_helpers import recho
from ...helpers.config import read_config
from .csv_handler import CSVHandler
from .data_handler_factory_interface import DataHandlerFactoryInterface
from .data_source_types import DataSourceTypes
from .parquet_handler import PARQUETHandler


class DataHandlerFactory(DataHandlerFactoryInterface):  # pylint: disable=too-few-public-methods
    """A factory creating the needed data handler objects."""

    def get_object(
        self, handler: DataSourceTypes, config: Path | None
    ) -> CSVHandler | PARQUETHandler:
        """Creates a DataHandler object if handler_type is 'CSV' or 'PARQUET'"""
        match handler:
            case DataSourceTypes.CSV:
                try:
                    if config is None:
                        err_msg = "No data configuration provided."
                        raise FileNotFoundError(err_msg)
                    csv_config = read_config(config)
                except (
                    UnicodeDecodeError,
                    YAMLError,
                    FileNotFoundError,
                    TypeError,
                    OSError,
                ) as err:
                    recho(f"Problematic configuration file {config}: {err}")
                    sys.exit(1)
                CSVHandler.validate_config(csv_config)
                return CSVHandler(csv_config["columns"], **csv_config["general"])
            case DataSourceTypes.PARQUET:
                return PARQUETHandler()
            case _:
                recho("Data source type not known")
                sys.exit(1)