import logging
import sys

import pytest

from freqtrade.exceptions import OperationalException
from freqtrade.loggers import (
    FTBufferingHandler,
    FTStdErrStreamHandler,
    set_loggers,
    setup_logging,
    setup_logging_pre,
)
from freqtrade.loggers.set_log_levels import (
    reduce_verbosity_for_bias_tester,
    restore_verbosity_for_bias_tester,
)


def test_set_loggers() -> None:
    # Reset Logging to Debug, otherwise this fails randomly as it's set globally
    logging.getLogger("requests").setLevel(logging.DEBUG)
    logging.getLogger("urllib3").setLevel(logging.DEBUG)
    logging.getLogger("ccxt.base.exchange").setLevel(logging.DEBUG)
    logging.getLogger("telegram").setLevel(logging.DEBUG)

    previous_value1 = logging.getLogger("requests").level
    previous_value2 = logging.getLogger("ccxt.base.exchange").level
    previous_value3 = logging.getLogger("telegram").level

    set_loggers()

    value1 = logging.getLogger("requests").level
    assert previous_value1 is not value1
    assert value1 is logging.INFO

    value2 = logging.getLogger("ccxt.base.exchange").level
    assert previous_value2 is not value2
    assert value2 is logging.INFO

    value3 = logging.getLogger("telegram").level
    assert previous_value3 is not value3
    assert value3 is logging.INFO

    set_loggers(verbosity=2)

    assert logging.getLogger("requests").level is logging.DEBUG
    assert logging.getLogger("ccxt.base.exchange").level is logging.INFO
    assert logging.getLogger("telegram").level is logging.INFO
    assert logging.getLogger("werkzeug").level is logging.INFO

    set_loggers(verbosity=3, api_verbosity="error")

    assert logging.getLogger("requests").level is logging.DEBUG
    assert logging.getLogger("ccxt.base.exchange").level is logging.DEBUG
    assert logging.getLogger("telegram").level is logging.INFO
    assert logging.getLogger("werkzeug").level is logging.ERROR


@pytest.mark.skipif(sys.platform == "win32", reason="does not run on windows")
def test_set_loggers_syslog():
    logger = logging.getLogger()
    orig_handlers = logger.handlers
    logger.handlers = []

    config = {
        "verbosity": 2,
        "logfile": "syslog:/dev/log",
    }

    setup_logging_pre()
    setup_logging(config)
    assert len(logger.handlers) == 3
    assert [x for x in logger.handlers if isinstance(x, logging.handlers.SysLogHandler)]
    assert [x for x in logger.handlers if isinstance(x, FTStdErrStreamHandler)]
    assert [x for x in logger.handlers if isinstance(x, FTBufferingHandler)]
    # setting up logging again should NOT cause the loggers to be added a second time.
    setup_logging(config)
    assert len(logger.handlers) == 3
    # reset handlers to not break pytest
    logger.handlers = orig_handlers


@pytest.mark.skipif(sys.platform == "win32", reason="does not run on windows")
def test_set_loggers_Filehandler(tmp_path):
    logger = logging.getLogger()
    orig_handlers = logger.handlers
    logger.handlers = []
    logfile = tmp_path / "ft_logfile.log"
    config = {
        "verbosity": 2,
        "logfile": str(logfile),
    }

    setup_logging_pre()
    setup_logging(config)
    assert len(logger.handlers) == 3
    assert [x for x in logger.handlers if isinstance(x, logging.handlers.RotatingFileHandler)]
    assert [x for x in logger.handlers if isinstance(x, FTStdErrStreamHandler)]
    assert [x for x in logger.handlers if isinstance(x, FTBufferingHandler)]
    # setting up logging again should NOT cause the loggers to be added a second time.
    setup_logging(config)
    assert len(logger.handlers) == 3
    # reset handlers to not break pytest
    if logfile.exists:
        logfile.unlink()
    logger.handlers = orig_handlers


@pytest.mark.skip(reason="systemd is not installed on every system, so we're not testing this.")
def test_set_loggers_journald(mocker):
    logger = logging.getLogger()
    orig_handlers = logger.handlers
    logger.handlers = []

    config = {
        "verbosity": 2,
        "logfile": "journald",
    }

    setup_logging_pre()
    setup_logging(config)
    assert len(logger.handlers) == 3
    assert [x for x in logger.handlers if type(x).__name__ == "JournaldLogHandler"]
    assert [x for x in logger.handlers if isinstance(x, FTStdErrStreamHandler)]
    # reset handlers to not break pytest
    logger.handlers = orig_handlers


def test_set_loggers_journald_importerror(import_fails):
    logger = logging.getLogger()
    orig_handlers = logger.handlers
    logger.handlers = []

    config = {
        "verbosity": 2,
        "logfile": "journald",
    }
    with pytest.raises(OperationalException, match=r"You need the cysystemd python package.*"):
        setup_logging(config)
    logger.handlers = orig_handlers


def test_reduce_verbosity():
    setup_logging_pre()
    reduce_verbosity_for_bias_tester()
    prior_level = logging.getLogger("freqtrade").getEffectiveLevel()

    assert logging.getLogger("freqtrade.resolvers").getEffectiveLevel() == logging.WARNING
    assert logging.getLogger("freqtrade.strategy.hyper").getEffectiveLevel() == logging.WARNING
    # base level wasn't changed
    assert logging.getLogger("freqtrade").getEffectiveLevel() == prior_level

    restore_verbosity_for_bias_tester()

    assert logging.getLogger("freqtrade.resolvers").getEffectiveLevel() == prior_level
    assert logging.getLogger("freqtrade.strategy.hyper").getEffectiveLevel() == prior_level
    assert logging.getLogger("freqtrade").getEffectiveLevel() == prior_level
    # base level wasn't changed