#!/usr/bin/env python
# -*- coding: utf-8 -*-
# -*- Python -*-
#
# $Id: generate-draft-aliases $
#
# Author: Markus Stenberg <markus.stenberg@iki.fi>
#
"""

This code dumps Django model InternetDraft's contents as postfix email
aliases

<no suffix> (same as -authors)
.authors (list of authors)
.chairs (WG chairs)
.notify (notify emails(?))
.ad (sponsoring AD)
.all (all of the above)

TODO:

- results somewhat inconsistent with the results from the old tool;
  should examine why (ask me for diff tool if interested in fixing it)

"""

# boilerplate (from various other ietf/bin scripts)
import os, sys, re

filename = os.path.abspath(__file__)
basedir = os.path.abspath(os.path.join(os.path.dirname(__file__), "../.."))
sys.path = [ basedir ] + sys.path
os.environ["DJANGO_SETTINGS_MODULE"] = "ietf.settings"

virtualenv_activation = os.path.join(basedir, "bin", "activate_this.py")
if os.path.exists(virtualenv_activation):
    execfile(virtualenv_activation, dict(__file__=virtualenv_activation))

import django
django.setup()

from django.conf import settings

from ietf.doc.models import Document
from ietf.group.utils import get_group_role_emails, get_group_ad_emails
from ietf.utils.aliases import *
import time

def get_draft_ad_emails(draft):
    " Get AD email for the given draft, if any. "
    # If working group document, return current WG ADs
    wg = draft.group
    if wg and wg.acronym != 'none' and wg.parent and wg.parent.acronym != 'none':
        return get_group_ad_emails(wg)
    # If not, return explicit AD set (whether up to date or not)
    ad = draft.ad
    #return [ad and ad.user and ad.user.email]
    return [ad and ad.email_address()]

def get_draft_shepherd_email(draft):
    return [ draft.shepherd.email_address() ] if draft.shepherd else []

def get_draft_authors_emails(draft):
    " Get list of authors for the given draft."

    # This feels 'correct'; however, it creates fairly large delta
    return [email.email_address() for email in draft.authors.all()]

    # This gives fairly small delta compared to current state,
    # however, it seems to be wrong (doesn't check for emails being
    # active etc).
    #return [email.address for email in draft.authors.all()]

def get_draft_notify_emails(draft):
    " Get list of email addresses to notify for the given draft."
    n = draft.notify
    if not n:
        return []
    l = []
    ad_email_alias_regex = "^%s\.ad@(%s|%s)$" % (draft.name, settings.DRAFT_ALIAS_DOMAIN, settings.TOOLS_SERVER)
    all_email_alias_regex = "^%s\.all@(%s|%s)$" % (draft.name, settings.DRAFT_ALIAS_DOMAIN, settings.TOOLS_SERVER)
    author_email_alias_regex = "^%s@(%s|%s)$" % (draft.name, settings.DRAFT_ALIAS_DOMAIN, settings.TOOLS_SERVER)
    notify_email_alias_regex = "^%s\.notify@(%s|%s)$" % (draft.name, settings.DRAFT_ALIAS_DOMAIN, settings.TOOLS_SERVER)
    shepherd_email_alias_regex = "^%s\.shepherd@(%s|%s)$" % (draft.name, settings.DRAFT_ALIAS_DOMAIN, settings.TOOLS_SERVER)
    for e in n.split(','):
        # If one of the directly expandable aliases are listed in the notify
        # list, we expand it
        e = e.strip()
        if   re.search(ad_email_alias_regex, e):
            l.extend(get_draft_ad_emails(draft))
        elif re.search(author_email_alias_regex, e):
            l.extend(get_draft_authors_emails(draft))
        elif re.search(shepherd_email_alias_regex, e):
            l.extend(get_draft_shepherd_email(draft))
        elif re.search(all_email_alias_regex, e):
            l.extend(get_draft_ad_emails(draft))
            l.extend(get_draft_authors_emails(draft))
            l.extend(get_draft_shepherd_email(draft))
        elif re.search(notify_email_alias_regex, e):
            pass
        else:
            l.append(e)
    # Alternative: if we don't want to do expansion, just this would be
    # perhaps better (MTA can do expansion too):
    # l = n.split(',')
    return l

if __name__ == '__main__':
    import datetime
    import time

    # Year ago?
    show_since = datetime.datetime.now() - datetime.timedelta(2*365)
    # 10 years ago?
    #show_since = datetime.datetime.now() - datetime.timedelta(10 * 365)

    date = time.strftime("%Y-%m-%d_%H:%M:%S")
    signature =  '# Generated by %s at %s\n' % (filename, date)

    afile = open(settings.DRAFT_ALIASES_PATH, "w")
    vfile = open(settings.DRAFT_VIRTUAL_PATH, "w")

    afile.write(signature)
    vfile.write(signature)
    vfile.write("%s anything\n" % settings.DRAFT_VIRTUAL_DOMAIN)

    drafts = Document.objects.filter(name__startswith='draft-')

    # Drafts with active status
    active_drafts = drafts.filter(states__slug='active')

    # Drafts that expired within year
    inactive_recent_drafts = drafts.exclude(states__slug='active').filter(expires__gte=show_since)

    interesting_drafts = active_drafts | inactive_recent_drafts

    for draft in interesting_drafts.distinct().iterator():
        # Omit RFCs, we care only about drafts
        if draft.docalias_set.filter(name__startswith='rfc'):
            if  (datetime.datetime.now() - draft.latest_event(type='published_rfc').time) > datetime.timedelta(days= 365 * 3 ):
                continue

        alias = draft.name
        all = []
        def handle_sublist(afile, vfile, alias, emails):
            all.extend( dump_sublist(afile, vfile, alias, settings.DRAFT_VIRTUAL_DOMAIN, emails) )
        #.authors (/and no suffix) = authors
        # First, do no suffix case
        handle_sublist(afile, vfile, alias,             get_draft_authors_emails(draft))
        handle_sublist(afile, vfile, alias+'.authors',  get_draft_authors_emails(draft))

        # .chairs = group chairs
        if draft.group:
            handle_sublist(afile, vfile, alias+'.chairs', get_group_role_emails(draft.group, ['chair', 'secr']))

        # .ad = sponsoring AD / WG AD (WG document)
        handle_sublist(afile, vfile, alias+'.ad',       get_draft_ad_emails(draft))

        # .notify = notify email list from the Document
        handle_sublist(afile, vfile, alias+'.notify',   get_draft_notify_emails(draft))

        # .shepherd = shepherd email from the Document
        handle_sublist(afile, vfile, alias+'.shepherd',   get_draft_shepherd_email(draft))

        # .all = everything on 'all' (expanded aliases)
        handle_sublist(afile, vfile, alias+'.all',      all)


    afile.close()
    vfile.close()