"""
@FileName：3666.py
@Description：PyCharm
@Author：Jerry Pan
@Time：2023/5/3 17:50
@Department：技术部
@Copyright：©2019-2023
"""
import time
import logging
import re


class InputError(Exception):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self, expression, message):
        self.expression = expression
        self.message = message


class InvalidUserAgentError(Exception):
    def __init__(
            self,
            message=None,
    ):
        self.message = message


class InvalidSystemClock(Exception):
    def __init__(
            self,
            message=None,
    ):
        self.message = message


class IdWorker(object):
    def __init__(self, worker_id, data_center_id):
        self.worker_id = worker_id
        self.data_center_id = data_center_id

        self.user_agent_parser = re.compile("[a-zA-Z][a-zA-Z\-0-9]*")
        self.logger = logging.getLogger("idworker")

        # stats
        self.ids_generated = 0

        self.twepoch = 1483200000000

        self.sequence = 0
        self.worker_id_bits = 5
        self.data_center_id_bits = 5
        self.max_worker_id = -1 ^ (-1 << self.worker_id_bits)
        self.max_data_center_id = -1 ^ (-1 << self.data_center_id_bits)
        self.sequence_bits = 12

        self.worker_id_shift = self.sequence_bits
        self.data_center_id_shift = self.sequence_bits + self.worker_id_bits
        self.timestamp_left_shift = (
                self.sequence_bits + self.worker_id_bits + self.data_center_id_bits
        )
        self.sequence_mask = -1 ^ (-1 << self.sequence_bits)

        self.last_timestamp = -1

        # Sanity check for worker_id
        if self.worker_id > self.max_worker_id or self.worker_id < 0:
            raise InputError(
                "worker_id",
                "worker id can't be greater than %i or less than 0"
                % self.max_worker_id,
            )

        if self.data_center_id > self.max_data_center_id or self.data_center_id < 0:
            raise InputError(
                "data_center_id",
                "data center id can't be greater than %i or less than 0"
                % self.max_data_center_id,
            )

        self.logger.info(
            "worker starting. timestamp left shift %d, data center id bits %d, worker id bits %d, sequence bits %d, worker id %d"
            % (
                self.timestamp_left_shift,
                self.data_center_id_bits,
                self.worker_id_bits,
                self.sequence_bits,
                self.worker_id,
            )
        )

    def _time_gen(self):
        return int(time.time() * 1000)

    def _till_next_millis(self, last_timestamp):
        timestamp = self._time_gen()
        while timestamp <= last_timestamp:
            timestamp = self._time_gen()

        return timestamp

    def _next_id(self):
        timestamp = self._time_gen()

        if self.last_timestamp > timestamp:
            self.logger.warning(
                "clock is moving backwards. Rejecting request until %i"
                % self.last_timestamp
            )
            raise InvalidSystemClock(
                "Clock moved backwards. Refusing to generate id for %i milliseocnds"
                % self.last_timestamp
            )

        if self.last_timestamp == timestamp:
            self.sequence = (self.sequence + 1) & self.sequence_mask
            if self.sequence == 0:
                timestamp = self._till_next_millis(self.last_timestamp)
        else:
            self.sequence = 0

        self.last_timestamp = timestamp

        new_id = (
                ((timestamp - self.twepoch) << self.timestamp_left_shift)
                | (self.data_center_id << self.data_center_id_shift)
                | (self.worker_id << self.worker_id_shift)
                | self.sequence
        )
        self.ids_generated += 1
        return new_id

    def _valid_user_agent(self, user_agent):
        return self.user_agent_parser.search(user_agent) is not None

    def get_worker_id(self):
        return self.worker_id

    def get_timestamp(self):
        return self._time_gen()

    def get_id(self):
        new_id = self._next_id()
        self.logger.debug(
            "id: %i  worker_id: %i  data_center_id: %i"
            % (new_id, self.worker_id, self.data_center_id)
        )
        return new_id

    def get_datacenter_id(self):
        return self.data_center_id


if __name__ == "__main__":
    a = time.time()
    id_worker = IdWorker(2, 3)
    new_id = id_worker.get_id()
    print(new_id)
    s = set()
    for _ in range(1000000):
        s.add(id_worker.get_id())
    print(len(s))
    print(time.time() - a)

    # import uuid
    #
    # a = time.time()
    # s = set()
    # print(uuid.uuid4().hex)
    # for _ in range(1000000):
    #     s.add(uuid.uuid4().hex)
    # print(len(s))
    # print(time.time() - a)