#
# Copyright (c) 2022 Airbyte, Inc., all rights reserved.
#

import builtins
import datetime
import numbers
from typing import Union

from dateutil import parser

"""
This file contains macros that can be evaluated by a `JinjaInterpolation` object
"""


def now_local() -> datetime.datetime:
    """
    Current local date and time.

    Usage:
    `"{{ now_local() }}"
    """
    return datetime.datetime.now()


def now_utc():
    """
    Current local date and time in UTC timezone

    Usage:
    `"{{ now_utc() }}"`
    """
    return datetime.datetime.now(datetime.timezone.utc)


def today_utc():
    """
    Current date in UTC timezone

    Usage:
    `"{{ today_utc() }}"`
    """
    return datetime.datetime.now(datetime.timezone.utc).date()


def timestamp(dt: Union[numbers.Number, str]):
    """
    Converts a number or a string to a timestamp

    If dt is a number, then convert to an int
    If dt is a string, then parse it using dateutil.parser

    Usage:
    `"{{ timestamp(1658505815.223235) }}"

    :param dt: datetime to convert to timestamp
    :return: unix timestamp
    """
    if isinstance(dt, numbers.Number):
        return int(dt)
    else:
        return int(parser.parse(dt).replace(tzinfo=datetime.timezone.utc).timestamp())


def max(*args):
    """
    Returns biggest object of an iterable, or two or more arguments.

    max(iterable, *[, default=obj, key=func]) -> value
    max(arg1, arg2, *args, *[, key=func]) -> value

    Usage:
    `"{{ max(2,3) }}"

    With a single iterable argument, return its biggest item. The
    default keyword-only argument specifies an object to return if
    the provided iterable is empty.
    With two or more arguments, return the largest argument.
    :param args: args to compare
    :return: largest argument
    """
    return builtins.max(*args)


def day_delta(num_days: int) -> str:
    """
    Returns datetime of now() + num_days

    Usage:
    `"{{ day_delta(25) }}"`

    :param num_days: number of days to add to current date time
    :return: datetime formatted as RFC3339
    """
    return (datetime.datetime.now(datetime.timezone.utc) + datetime.timedelta(days=num_days)).strftime("%Y-%m-%dT%H:%M:%S.%f%z")


_macros_list = [now_local, now_utc, today_utc, timestamp, max, day_delta]
macros = {f.__name__: f for f in _macros_list}