# -*- coding: utf-8 -*-
#
#   mail.py - methods used by requestsync when used in "mail" mode
#
#   Copyright © 2009 Michael Bienia <geser@ubuntu.com>
#
#   This module may contain code written by other authors/contributors to
#   the main requestsync script. See there for their names.
#
#   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; version 2
#
#   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.
#
#   Please see the /usr/share/common-licenses/GPL-2 file for the full text
#   of the GNU General Public License license.

import os
import sys
import subprocess
import smtplib
import socket
from debian.changelog import Version
from ubuntutools.requestsync.common import raw_input_exit_on_ctrlc
from ubuntutools.lp.udtexceptions import PackageNotFoundException

__all__ = [
    'getDebianSrcPkg',
    'getUbuntuSrcPkg',
    'needSponsorship',
    'checkExistingReports',
    'mailBug',
    ]

class SourcePackagePublishingHistory(object):
    '''
    Simulate a SourcePackagePublishingHistory class from the LP API caching
    module.
    '''
    def __init__(self, name, version, component):
        self.name = name
        self.version = version
        self.component = component

    def getPackageName(self):
        return self.name

    def getVersion(self):
        return self.version

    def getComponent(self):
        return self.component

def rmadison(distro, package, release):
    # Map 'sid' and 'squeeze' to their releasenames else rmadison gets a python
    # traceback back from the remote script
    releasenames = {
        'sid': 'unstable',
        'squeeze': 'testing', # Needs updating after each Debian release
    }
    release = releasenames.get(release, release)

    rmadison_cmd = subprocess.Popen(
        ['rmadison', '-u', distro, '-a', 'source', '-s', release, package],
        stdout = subprocess.PIPE)

    rmadison_out = rmadison_cmd.communicate()[0]
    assert (rmadison_cmd.returncode == 0)

    # Return the most recent source line
    lines = rmadison_out.splitlines()
    if not lines:
        # no output
        return None
    lines = [map(lambda x: x.strip(), line.split('|')) for line in lines]
    lines = [line for line in lines if line[3].find('source') != -1]
    if lines:
        return max(lines, key = lambda x: Version(x[1]))
    else:
        # no source line
        return None

def getSrcPkg(distro, name, release):
    out = rmadison(distro, name, release)
    if not out:
        raise PackageNotFoundException(
            "'%s' doesn't appear to exist in %s '%s'" % \
            (name, distro.capitalize(), release))

    version = out[1]
    component = 'main'
    raw_comp = out[2].split('/')
    if len(raw_comp) == 2:
        component = raw_comp[1]

    return SourcePackagePublishingHistory(name, version, component)

def getDebianSrcPkg(name, release):
    return getSrcPkg('debian', name, release)

def getUbuntuSrcPkg(name, release):
    return getSrcPkg('ubuntu', name, release)

def needSponsorship(name, component, release):
    '''
    Ask the user if he has upload permissions for the package or the
    component.
    '''

    while True:
        print "Do you have upload permissions for the '%s' component " \
            "or the package '%s' in Ubuntu %s?" % (component, name, release)
        val = raw_input_exit_on_ctrlc("If in doubt answer 'n'. [y/N]? ")
        if val.lower() in ('y', 'yes'):
            return False
        elif val.lower() in ('n', 'no', ''):
            return True
        else:
            print 'Invalid answer'

def checkExistingReports(srcpkg):
    '''
    Point the user to the URL to manually check for duplicate bug reports.
    '''
    print 'Please check on https://bugs.launchpad.net/ubuntu/+source/%s/+bugs\n' \
        'for duplicate sync requests before continuing.' % srcpkg
    raw_input_exit_on_ctrlc('Press [Enter] to continue or [Ctrl-C] to abort. ')

def mailBug(srcpkg, subscribe, status, bugtitle, bugtext, lpinstance, keyid,
            myemailaddr, mailserver_host, mailserver_port, mailserver_user,
            mailserver_pass):
    '''
    Submit the sync request per email.
    '''

    if lpinstance == 'production':
        to = 'new@bugs.launchpad.net'
    elif lpinstance == 'staging':
        to = 'new@bugs.staging.launchpad.net'
    else:
        print >> sys.stderr, 'Error: Unknown launchpad instance:', lpinstance
        sys.exit(1)

    # generate mailbody
    if srcpkg:
        mailbody = ' affects ubuntu/%s\n' % srcpkg
    else:
        mailbody = ' affects ubuntu\n'
    mailbody += '''\
 status %s
 importance wishlist
 subscribe %s
 done

%s''' % (status, subscribe, bugtext)

    # prepare sign command
    gpg_command = None
    for cmd in ('gpg', 'gpg2', 'gnome-gpg'):
        if os.access('/usr/bin/%s' % cmd, os.X_OK):
            gpg_command = [cmd]
    assert gpg_command # TODO: catch exception and produce error message

    gpg_command.append('--clearsign')
    if keyid:
        gpg_command.extend(('-u', keyid))

    # sign the mail body
    gpg = subprocess.Popen(gpg_command, stdin = subprocess.PIPE, stdout = subprocess.PIPE)
    signed_report = gpg.communicate(mailbody.encode('utf-8'))[0].decode('utf-8')
    assert gpg.returncode == 0

    # generate email
    mail = u'''\
From: %s
To: %s
Subject: %s
Content-Type: text/plain; charset=UTF-8

%s''' % (myemailaddr, to, bugtitle, signed_report)

    print 'The final report is:\n%s' % mail
    raw_input_exit_on_ctrlc('Press [Enter] to continue or [Ctrl-C] to abort. ')

    # connect to the server
    try:
        print 'Connecting to %s:%s ...' % (mailserver_host, mailserver_port)
        s = smtplib.SMTP(mailserver_host, mailserver_port)
    except socket.error, s:
        print >> sys.stderr, 'E: Could not connect to %s:%s: %s (%i)' % \
            (mailserver_host, mailserver_port, s[1], s[0])
        return

    if mailserver_user and mailserver_pass:
        try:
            s.login(mailserver_user, mailserver_pass)
        except smtplib.SMTPAuthenticationError:
            print >> sys.stderr, 'E: Error authenticating to the server: invalid username and password.'
            s.quit()
            return
        except:
            print >> sys.stderr, 'E: Unknown SMTP error.'
            s.quit()
            return

    s.sendmail(myemailaddr, to, mail.encode('utf-8'))
    s.quit()
    print 'Sync request mailed.'