from __future__ import annotations

import datetime
import logging
from zoneinfo import ZoneInfo, ZoneInfoNotFoundError

import dateparser

from discord_reminder_bot.settings import get_timezone

logger: logging.Logger = logging.getLogger(__name__)


def parse_time(date_to_parse: str | None, timezone: str | None = None, use_dotenv: bool = True) -> datetime.datetime | None:  # noqa: FBT001, FBT002
    """Parse a date string into a datetime object.

    Args:
        date_to_parse(str): The date string to parse.
        timezone(str, optional): The timezone to use. Defaults timezone from settings.
        use_dotenv(bool, optional): Whether to load environment variables from a .env file. Defaults to True

    Returns:
        datetime.datetime: The parsed datetime object.
    """
    logger.info("Parsing date: '%s' with timezone: '%s'", date_to_parse, timezone)

    if not date_to_parse:
        logger.error("No date provided to parse.")
        return None

    if not timezone:
        timezone = get_timezone(use_dotenv)

    # Check if the timezone is valid
    try:
        tz = ZoneInfo(timezone)
    except (ZoneInfoNotFoundError, ModuleNotFoundError):
        logger.error("Invalid timezone provided: '%s'. Using default timezone: '%s'", timezone, get_timezone(use_dotenv))  # noqa: TRY400
        tz = ZoneInfo("UTC")

    try:
        parsed_date: datetime.datetime | None = dateparser.parse(
            date_string=date_to_parse,
            settings={
                "PREFER_DATES_FROM": "future",
                "TIMEZONE": f"{timezone}",
                "RETURN_AS_TIMEZONE_AWARE": True,
                "RELATIVE_BASE": datetime.datetime.now(tz=tz),
            },
        )
    except (ValueError, TypeError):
        return None

    return parsed_date