#!/usr/bin/python
# Copyright (c) 2014 SUSE Linux Products GmbH
# Copyright (c) 2015, 2016 SUSE Linux GmbH
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

import httplib
import re
from urlparse import urlparse, urljoin
import smtplib
from email.mime.text import MIMEText
import os
import sys
from optparse import OptionParser

parser = OptionParser()
parser.add_option("--dry", action="store_true", help="dry run")
parser.add_option("--debug", action="store_true", help="debug output")
parser.add_option("--verbose", action="store_true", help="verbose")
parser.add_option("--from", dest='sender', metavar="EMAIL", help="sender email address")
parser.add_option("--to", metavar="EMAIL", help="recepient email address")
parser.add_option("--relay", metavar="RELAY", help="SMTP relay server address")
parser.add_option("--version", metavar="VERSION", help="announce specific version")

(options, args) = parser.parse_args()

if not options.sender or not options.to or not options.relay:
    print >>sys.stderr, "need to specify --from and --to and --relay"
    sys.exit(1)

url = "http://download.opensuse.org/tumbleweed/iso/"
iso = "openSUSE-Tumbleweed-DVD-x86_64-Current.iso"
changes = "Changes.%s.txt"
intro = """
Please note that this mail was generated by a script.
The described changes are computed based on the x86_64 DVD.
The full online repo contains too many changes to be listed here.

Please check the known defects of this snapshot before upgrading:
https://openqa.opensuse.org/tests/overview?distri=opensuse&groupid=1&version=Tumbleweed&build={}

"""

current_fn = os.path.join(os.path.dirname(__file__), "announcer-current-version")

if not options.version:
    u = urlparse(urljoin(url, iso))
    conn = httplib.HTTPConnection(u.hostname, 80)
    conn.request('HEAD', u.path)
    res = conn.getresponse()
    if res.status != 302:
        raise Exception("http fail: %s %s"%(res.status, res.reason))

    loc = res.getheader('location')
    if loc is None:
        raise Exception("empty location!")

    m = re.search('Snapshot(\d+)-Media', loc)
    if m is None:
        raise Exception("invalid location")

    version = m.group(1)
    if options.verbose:
        print "found version", version
else:
    version = options.version

if os.path.lexists(current_fn):
    prev = os.readlink(current_fn)
    if prev == version:
        if options.verbose:
            print "version unchanged, exit"
        sys.exit(0)

u = urlparse(urljoin(url, changes%version))
conn = httplib.HTTPConnection(u.hostname, 80)
conn.request('HEAD', u.path)
res = conn.getresponse()
if res.status == 302:

    loc = res.getheader('location')
    if loc is None:
	raise Exception("empty location!")
    u = urlparse(loc)

conn = httplib.HTTPConnection(u.hostname, 80)
conn.request('GET', u.path)
res = conn.getresponse()
if res.status != 200:
    raise Exception("http fail: %s %s"%(res.status, res.reason))

txt = res.read()
if not "====" in txt:
    if options.verbose:
        print >>sys.stderr, "no changes or file corrupt? not sending anything"
    sys.exit(1)

msg = MIMEText(intro.format(version) + txt)
msg['Subject'] = 'New Tumbleweed snapshot %s released!'%version
msg['From'] = options.sender
msg['To'] = options.to
msg['Mail-Followup-To'] = options.to

if options.dry:
    print "sending ..."
    print msg.as_string()
else:
    s = smtplib.SMTP(options.relay)
    s.sendmail(options.sender, [msg['To']], msg.as_string())
    s.quit()

    tmpfn = os.path.join(os.path.dirname(__file__), ".announcer-current-version")
    os.symlink(version, tmpfn)
    os.rename(tmpfn, current_fn)

# vim: sw=4 et