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from __future__ import absolute_import

import sys
import traceback

import logbook

from elasticapm.base import Client
from elasticapm.utils.encoding import to_unicode

LOOKBOOK_LEVELS = {
    logbook.DEBUG: "debug",
    logbook.INFO: "info",
    logbook.NOTICE: "info",
    logbook.WARNING: "warning",
    logbook.ERROR: "error",
    logbook.CRITICAL: "fatal",
}


class LogbookHandler(logbook.Handler):
    def __init__(self, *args, **kwargs):
        if len(args) == 1:
            arg = args[0]
            # if isinstance(arg, str):
            # self.client = kwargs.pop('client_cls', Client)(dsn=arg)
            if isinstance(arg, Client):
                self.client = arg
            else:
                raise ValueError(
                    "The first argument to %s must be a Client instance, "
                    "got %r instead." % (self.__class__.__name__, arg)
                )
            args = []
        else:
            try:
                self.client = kwargs.pop("client")
            except KeyError:
                raise TypeError("Expected keyword argument for LoggingHandler: client")
        super(LogbookHandler, self).__init__(*args, **kwargs)

    def emit(self, record):
        self.format(record)

        # Avoid typical config issues by overriding loggers behavior
        if record.channel.startswith("elasticapm.errors"):
            sys.stderr.write(to_unicode(record.message) + "\n")
            return

        try:
            return self._emit(record)
        except Exception:
            sys.stderr.write("Top level ElasticAPM exception caught - failed creating log record.\n")
            sys.stderr.write(to_unicode(record.message) + "\n")
            sys.stderr.write(traceback.format_exc() + "\n")

            try:
                self.client.capture("Exception")
            except Exception:
                pass

    def _emit(self, record):
        # If there's no exception being processed,
        # exc_info may be a 3-tuple of None
        # http://docs.python.org/library/sys.html#sys.exc_info
        if record.exc_info is True or (record.exc_info and all(record.exc_info)):
            handler = self.client.get_handler("elasticapm.events.Exception")
            exception = handler.capture(self.client, exc_info=record.exc_info)
        else:
            exception = None

        return self.client.capture_message(
            param_message={"message": str(record.msg), "params": record.args},
            exception=exception,
            level=LOOKBOOK_LEVELS[record.level],
            logger_name=record.channel,
            custom=record.extra,
            stack=record.kwargs.get("stack"),
        )