#!/usr/bin/env python
# coding=utf-8
#
# Copyright (C) 2009-2021 Splunk Inc. All Rights Reserved.

""" Sets the packages path and optionally starts the Python remote debugging client.

The Python remote debugging client depends on the settings of the variables defined in _debug_conf.py.  Set these
variables in _debug_conf.py to enable/disable debugging using either the JetBrains PyCharm or Eclipse PyDev remote
debugging packages, which must be unzipped and copied to packages/pydebug.

"""

from __future__ import absolute_import, division, print_function, unicode_literals
from collections import OrderedDict
from os import path
from sys import modules, path as sys_path, stderr


def initialize_app():

    module_dir = path.dirname(path.realpath(__file__))
    packages = path.join(module_dir, 'packages')
    sys_path.insert(0, path.join(packages))

    configuration_file = path.join(module_dir, '_debug_conf.py')

    if not path.exists(configuration_file):
        return

    remote_debugging = OrderedDict([
        ('client_package_location', path.join(packages, 'pydebug')),
        ('is_enabled', False),
        ('host', None),
        ('port', 5678),
        ('suspend', True),
        ('stderr_to_server', False),
        ('stdout_to_server', False),
        ('overwrite_prev_trace', False),
        ('patch_multiprocessing', False),
        ('trace_only_current_thread', False)])

    exec(compile(open(configuration_file).read(), configuration_file, 'exec'), {}, remote_debugging)

    if remote_debugging['is_enabled']:

        debug_client = remote_debugging['client_package_location']

        if path.exists(debug_client):

            host, port = remote_debugging['host'], remote_debugging['port']
            sys_path.insert(1, debug_client)
            import pydevd

            print('Connecting to Python debug server at {0}:{1}'.format(host, port), file=stderr)
            stderr.flush()

            try:
                pydevd.settrace(
                    host=host,
                    port=port,
                    suspend=remote_debugging['suspend'],
                    stderrToServer=remote_debugging['stderr_to_server'],
                    stdoutToServer=remote_debugging['stdout_to_server'],
                    overwrite_prev_trace=remote_debugging['overwrite_prev_trace'],
                    patch_multiprocessing=remote_debugging['patch_multiprocessing'],
                    trace_only_current_thread=remote_debugging['trace_only_current_thread'])
            except SystemExit as error:
                print('Failed to connect to Python debug server at {0}:{1}: {2}'.format(host, port, error), file=stderr)
                stderr.flush()
            else:
                print('Connected to Python debug server at {0}:{1}'.format(host, port), file=stderr)
                stderr.flush()

    modules[__name__].remote_debugging = remote_debugging
    return

initialize_app()