"""
`allennlp.common.tqdm.Tqdm` wraps tqdm so we can add configurable
global defaults for certain tqdm parameters.
"""
import logging
import sys
from time import time
from typing import Optional

try:
    SHELL = str(type(get_ipython()))  # type:ignore # noqa: F821
except:  # noqa: E722
    SHELL = ""

if "zmqshell.ZMQInteractiveShell" in SHELL:
    from tqdm import tqdm_notebook as _tqdm
else:
    from tqdm import tqdm as _tqdm

from allennlp.common import logging as common_logging


# This is necessary to stop tqdm from hanging
# when exceptions are raised inside iterators.
# It should have been fixed in 4.2.1, but it still
# occurs.
# TODO(Mark): Remove this once tqdm cleans up after itself properly.
# https://github.com/tqdm/tqdm/issues/469
_tqdm.monitor_interval = 0


logger = logging.getLogger("tqdm")
logger.propagate = False


def replace_cr_with_newline(message: str) -> str:
    """
    TQDM and requests use carriage returns to get the training line to update for each batch
    without adding more lines to the terminal output. Displaying those in a file won't work
    correctly, so we'll just make sure that each batch shows up on its one line.
    """
    # In addition to carriage returns, nested progress-bars will contain extra new-line
    # characters and this special control sequence which tells the terminal to move the
    # cursor one line up.
    message = message.replace("\r", "").replace("\n", "").replace("[A", "")
    if message and message[-1] != "\n":
        message += "\n"
    return message


class TqdmToLogsWriter(object):
    def __init__(self):
        self.last_message_written_time = 0.0

    def write(self, message):
        file_friendly_message: Optional[str] = None
        if common_logging.FILE_FRIENDLY_LOGGING:
            file_friendly_message = replace_cr_with_newline(message)
            if file_friendly_message.strip():
                sys.stderr.write(file_friendly_message)
        else:
            sys.stderr.write(message)

        # Every 10 seconds we also log the message.
        now = time()
        if now - self.last_message_written_time >= 10 or "100%" in message:
            if file_friendly_message is None:
                file_friendly_message = replace_cr_with_newline(message)
            for message in file_friendly_message.split("\n"):
                message = message.strip()
                if len(message) > 0:
                    logger.info(message)
                    self.last_message_written_time = now

    def flush(self):
        sys.stderr.flush()


class Tqdm:
    @staticmethod
    def tqdm(*args, **kwargs):
        # Use a slower interval when FILE_FRIENDLY_LOGGING is set.
        default_mininterval = 2.0 if common_logging.FILE_FRIENDLY_LOGGING else 0.1

        new_kwargs = {
            "file": TqdmToLogsWriter(),
            "mininterval": default_mininterval,
            **kwargs,
        }

        return _tqdm(*args, **new_kwargs)
