# -*- coding: utf-8 -*-
# Copyright 2016-2017 Versada <https://versada.eu/>
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).

import logging
import urlparse

import openerp.http

_logger = logging.getLogger(__name__)
try:
    from raven.handlers.logging import SentryHandler
    from raven.processors import SanitizePasswordsProcessor
    from raven.utils.wsgi import get_environ, get_headers
except ImportError:
    _logger.debug('Cannot import "raven". Please make sure it is installed.')
    SentryHandler = object
    SanitizePasswordsProcessor = object


def get_request_info(request):
    '''
    Returns context data extracted from :param:`request`.

    Heavily based on flask integration for Sentry: https://git.io/vP4i9.
    '''
    urlparts = urlparse.urlsplit(request.url)
    return {
        'url': '%s://%s%s' % (urlparts.scheme, urlparts.netloc, urlparts.path),
        'query_string': urlparts.query,
        'method': request.method,
        'headers': dict(get_headers(request.environ)),
        'env': dict(get_environ(request.environ)),
    }


def get_extra_context():
    '''
    Extracts additional context from the current request (if such is set).
    '''
    request = openerp.http.request
    try:
        session = getattr(request, 'session', {})
    except RuntimeError:
        ctx = {}
    else:
        ctx = {
            'tags': {
                'database': session.get('db', None),
            },
            'user': {
                'login': session.get('login', None),
                'uid': session.get('uid', None),
            },
            'extra': {
                'context': session.get('context', {}),
            },
        }
        if request.httprequest:
            ctx.update({
                'request': get_request_info(request.httprequest),
            })
    return ctx


class LoggerNameFilter(logging.Filter):
    '''
    Custom :class:`logging.Filter` which allows to filter loggers by name.
    '''

    def __init__(self, loggers, name=''):
        super(LoggerNameFilter, self).__init__(name=name)
        self._exclude_loggers = set(loggers)

    def filter(self, event):
        return event.name not in self._exclude_loggers


class OdooSentryHandler(SentryHandler):
    '''
    Customized :class:`raven.handlers.logging.SentryHandler`.

    Allows to add additional Odoo and HTTP request data to the event which is
    sent to Sentry.
    '''

    def __init__(self, include_extra_context, *args, **kwargs):
        super(OdooSentryHandler, self).__init__(*args, **kwargs)
        self.include_extra_context = include_extra_context

    def emit(self, record):
        if self.include_extra_context:
            self.client.context.merge(get_extra_context())
        return super(OdooSentryHandler, self).emit(record)


class SanitizeOdooCookiesProcessor(SanitizePasswordsProcessor):
    '''
    Custom :class:`raven.processors.Processor`.

    Allows to sanitize sensitive Odoo cookies, namely the "session_id" cookie.
    '''

    # `FIELDS` was renamed to `KEYS` in raven 6.4.0.
    # Keep `FIELDS` for backwards compatibility.
    # See also issue #1096 on OCA/server-tools.
    KEYS = FIELDS = frozenset([
        'session_id',
    ])