# -*- encoding: utf-8 -*-
# Description:
# Common controller Web stuffs
#
# Authors:
# Benoît Allard <benoit.allard@greenbone.net>
#
# Copyright:
# Copyright (C) 2014 Greenbone Networks GmbH
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

"""\
Some common routines for handling of Notes, Acknowledgments and Reference that
is shared for the Document and the Vulnerabilities.
"""

import re
from datetime import datetime, timedelta

try:
    from datetime import timezone
except ImportError:
    from farolluz.py2 import FixedTimeZone as timezone

from flask import request, flash

from farolluz.cvrf import CVRFNote, CVRFReference, CVRFAcknowledgment
from farolluz.parsers.cvrf import parseDate as parseXMLDate, parseVersion as parseXMLVersion

def split_fields(field, separator=','):
    if not field:
        return []
    return [f.strip() for f in field.split(separator)]

def update_note_from_request(note):
    note._type = request.form['type']
    note._ordinal = int(request.form['ordinal'])
    note._note = request.form['note']
    note._title = request.form['title'] or None
    note._audience = request.form['audience'] or None

def create_note_from_request():
    title = request.form['title'] or None
    audience = request.form['audience'] or None

    return CVRFNote(request.form['type'], int(request.form['ordinal']),
                    request.form['note'], title, audience)

def update_reference_from_request(ref):
    ref._type = request.form['type'] or None
    ref._url = request.form['url']
    ref._description = request.form['description']

def create_reference_from_request():
    return CVRFReference(request.form['url'], request.form['description'],
                         request.form['type'] or None)

def update_acknowledgment_from_request(ack):
    ack._names = split_fields(request.form['names'])
    ack._organizations = split_fields(request.form['organizations'])
    ack._description = request.form['description'] or None
    ack._url = request.form['url'] or None

def create_acknowledgment_from_request():
    ack = CVRFAcknowledgment()
    ack._names = split_fields(request.form['names'])
    ack._organizations = split_fields(request.form['organizations'])
    ack._description = request.form['description'] or None
    ack._url = request.form['url'] or None
    return ack

def parseDate(string):
    """ An extended version of the XML parser's one, that also unsderstand
    date without time. """
    try: return parseXMLDate(string)
    except AttributeError: pass
    # Absorb AttributeError, and try to parse it a second time ...
    m = re.match('(\d{4})-(\d{2})-(\d{2})', string)
    if m is None:
        flash('Cannot parse date: "%s"' % string, 'warning')
        return None
    return datetime(int(m.group(1)), int(m.group(2)), int(m.group(3)),
                    tzinfo=timezone(timedelta(hours=0, minutes=0)))

def parseVersion(string):
    """ An extended version, one that doesn't throw exceptions """
    try: return parseXMLVersion(string)
    except ValueError:
        flash('Cannot parse Version string: "%s"' % string)
        return None