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

import os.path
import urllib.parse

from .processor import SanitizePasswordsProcessor
from .generalutils import get_environ
from sentry_sdk._compat import text_type
from werkzeug import datastructures


def get_request_info(request):
    """ Returns context data extracted from :param:`request`.
        Heavily based on flask integration for Sentry: https://git.io/vP4i9.
    """
    urlparts = urllib.parse.urlsplit(request.url)
    return {
        'url': '%s://%s%s' % (urlparts.scheme, urlparts.netloc, urlparts.path),
        'query_string': urlparts.query,
        'method': request.method,
        'headers': dict(datastructures.EnvironHeaders(request.environ)),
        'env': dict(get_environ(request.environ)),
    }


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


class SanitizeOdooCookiesProcessor(SanitizePasswordsProcessor):
    """ Custom :class:`raven.processors.Processor`.
        Allows to sanitize sensitive Odoo cookies, namely the "session_id" cookie.
    """

    KEYS = frozenset([
        'session_id',
    ])


class InvalidGitRepository(Exception):
    pass


def fetch_git_sha(path, head=None):
    """ >>> fetch_git_sha(os.path.dirname(__file__))
        Taken from https://git.io/JITmC
    """
    if not head:
        head_path = os.path.join(path, '.git', 'HEAD')
        if not os.path.exists(head_path):
            raise InvalidGitRepository(
                'Cannot identify HEAD for git repository at %s' % (path,))

        with open(head_path, 'r') as fp:
            head = text_type(fp.read()).strip()

        if head.startswith('ref: '):
            head = head[5:]
            revision_file = os.path.join(
                path, '.git', *head.split('/')
            )
        else:
            return head
    else:
        revision_file = os.path.join(path, '.git', 'refs', 'heads', head)

    if not os.path.exists(revision_file):
        if not os.path.exists(os.path.join(path, '.git')):
            raise InvalidGitRepository(
                '%s does not seem to be the root of a git repository' % (path,))

        # Check for our .git/packed-refs' file since a `git gc` may have run
        # https://git-scm.com/book/en/v2/Git-Internals-Maintenance-and-Data-Recovery
        packed_file = os.path.join(path, '.git', 'packed-refs')
        if os.path.exists(packed_file):
            with open(packed_file) as fh:
                for line in fh:
                    line = line.rstrip()
                    if line and line[:1] not in ('#', '^'):
                        try:
                            revision, ref = line.split(' ', 1)
                        except ValueError:
                            continue
                        if ref == head:
                            return text_type(revision)

        raise InvalidGitRepository(
            'Unable to find ref to head "%s" in repository' % (head,))

    with open(revision_file) as fh:
        return text_type(fh.read()).strip()