"""
Helper utilities for parsing durations - 1s, 1d, 10d, 30d, 1mo, 2mo

duration_in_seconds is used in diff parts of the code base, example 
- Router - Provider budget routing
- Proxy - Key, Team Generation
"""

import re
import time
from datetime import datetime, timedelta
from typing import Tuple


def _extract_from_regex(duration: str) -> Tuple[int, str]:
    match = re.match(r"(\d+)(mo|[smhd]?)", duration)

    if not match:
        raise ValueError("Invalid duration format")

    value, unit = match.groups()
    value = int(value)

    return value, unit


def get_last_day_of_month(year, month):
    # Handle December case
    if month == 12:
        return 31
    # Next month is January, so subtract a day from March 1st
    next_month = datetime(year=year, month=month + 1, day=1)
    last_day_of_month = (next_month - timedelta(days=1)).day
    return last_day_of_month


def duration_in_seconds(duration: str) -> int:
    """
    Parameters:
    - duration:
        - "<number>s" - seconds
        - "<number>m" - minutes
        - "<number>h" - hours
        - "<number>d" - days
        - "<number>mo" - months

    Returns time in seconds till when budget needs to be reset
    """
    value, unit = _extract_from_regex(duration=duration)

    if unit == "s":
        return value
    elif unit == "m":
        return value * 60
    elif unit == "h":
        return value * 3600
    elif unit == "d":
        return value * 86400
    elif unit == "mo":
        now = time.time()
        current_time = datetime.fromtimestamp(now)

        if current_time.month == 12:
            target_year = current_time.year + 1
            target_month = 1
        else:
            target_year = current_time.year
            target_month = current_time.month + value

        # Determine the day to set for next month
        target_day = current_time.day
        last_day_of_target_month = get_last_day_of_month(target_year, target_month)

        if target_day > last_day_of_target_month:
            target_day = last_day_of_target_month

        next_month = datetime(
            year=target_year,
            month=target_month,
            day=target_day,
            hour=current_time.hour,
            minute=current_time.minute,
            second=current_time.second,
            microsecond=current_time.microsecond,
        )

        # Calculate the duration until the first day of the next month
        duration_until_next_month = next_month - current_time
        return int(duration_until_next_month.total_seconds())

    else:
        raise ValueError(f"Unsupported duration unit, passed duration: {duration}")