import time
from typing import Dict


class PhoneRateLimiter:
    def __init__(self, window_seconds: int = 60) -> None:
        """手机号限流器

        Args:
            window_seconds: 限流窗口秒数

        Returns:
            None
        """
        self.window = window_seconds
        self.last_sent: Dict[str, float] = {}

    def allow(self, phone: str) -> bool:
        """校验是否允许发送

        Args:
            phone: 手机号

        Returns:
            True 表示允许发送，False 表示命中限流
        """
        now = time.time()
        ts = self.last_sent.get(phone, 0)
        if now - ts < self.window:
            return False
        self.last_sent[phone] = now
        return True

    def next_allowed_at(self, phone: str) -> float:
        """返回下一次允许发送的时间戳

        Args:
            phone: 手机号

        Returns:
            时间戳（秒）
        """
        ts = self.last_sent.get(phone, 0)
        return ts + self.window

    def reset(self) -> None:
        """重置限流状态

        Returns:
            None
        """
        self.last_sent.clear()