"""
Common utilities.
"""
from asyncio import AbstractEventLoop
from io import BytesIO
import base64
import json
import logging
import logging.handlers
import os
import platform
import sys
import time
from typing import AsyncGenerator, Generator
import warnings

import requests

LOGDIR = "./"


handler = None
visited_loggers = set()


def build_logger(logger_name, logger_filename):
    global handler

    formatter = logging.Formatter(
        fmt="%(asctime)s | %(levelname)s | %(name)s | %(message)s",
        datefmt="%Y-%m-%d %H:%M:%S",
    )

    # Set the format of root handlers
    if not logging.getLogger().handlers:
        if sys.version_info[1] >= 9:
            # This is for windows
            logging.basicConfig(level=logging.INFO, encoding="utf-8")
        else:
            if platform.system() == "Windows":
                warnings.warn(
                    "If you are running on Windows, "
                    "we recommend you use Python >= 3.9 for UTF-8 encoding."
                )
            logging.basicConfig(level=logging.INFO)
    logging.getLogger().handlers[0].setFormatter(formatter)

    # Redirect stdout and stderr to loggers
    stdout_logger = logging.getLogger("stdout")
    stdout_logger.setLevel(logging.INFO)
    sl = StreamToLogger(stdout_logger, logging.INFO)
    sys.stdout = sl

    stderr_logger = logging.getLogger("stderr")
    stderr_logger.setLevel(logging.ERROR)
    sl = StreamToLogger(stderr_logger, logging.ERROR)
    sys.stderr = sl

    # Get logger
    logger = logging.getLogger(logger_name)
    logger.setLevel(logging.INFO)

    # Avoid httpx flooding POST logs
    logging.getLogger("httpx").setLevel(logging.WARNING)

    # if LOGDIR is empty, then don't try output log to local file
    if LOGDIR != "":
        os.makedirs(LOGDIR, exist_ok=True)
        filename = os.path.join(LOGDIR, logger_filename)
        handler = logging.handlers.TimedRotatingFileHandler(
            filename, when="D", utc=True, encoding="utf-8"
        )
        handler.setFormatter(formatter)

        for l in [stdout_logger, stderr_logger, logger]:
            if l in visited_loggers:
                continue
            visited_loggers.add(l)
            l.addHandler(handler)

    return logger

class StreamToLogger(object):
    """
    Fake file-like stream object that redirects writes to a logger instance.
    """

    def __init__(self, logger, log_level=logging.INFO):
        self.terminal = sys.stdout
        self.logger = logger
        self.log_level = log_level
        self.linebuf = ""

    def __getattr__(self, attr):
        return getattr(self.terminal, attr)

    def write(self, buf):
        temp_linebuf = self.linebuf + buf
        self.linebuf = ""
        for line in temp_linebuf.splitlines(True):
            # From the io.TextIOWrapper docs:
            #   On output, if newline is None, any '\n' characters written
            #   are translated to the system default line separator.
            # By default sys.stdout.write() expects '\n' newlines and then
            # translates them so this is still cross platform.
            if line[-1] == "\n":
                encoded_message = line.encode("utf-8", "ignore").decode("utf-8")
                self.logger.log(self.log_level, encoded_message.rstrip())
            else:
                self.linebuf += line

    def flush(self):
        if self.linebuf != "":
            encoded_message = self.linebuf.encode("utf-8", "ignore").decode("utf-8")
            self.logger.log(self.log_level, encoded_message.rstrip())
        self.linebuf = ""