#!/usr/bin/env python2.7

# Check for override mismatches between pockets
# Copyright (C) 2005, 2008, 2011, 2012  Canonical Ltd.
# Author: Colin Watson <cjwatson@ubuntu.com>

# 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

from __future__ import print_function

import atexit
from collections import defaultdict
import gzip
try:
    from html import escape
except ImportError:
    from cgi import escape
from optparse import OptionParser
import os
import shutil
import sys
import tempfile
from textwrap import dedent
import time

import apt_pkg
from launchpadlib.launchpad import Launchpad


tempdir = None


def ensure_tempdir():
    global tempdir
    if not tempdir:
        tempdir = tempfile.mkdtemp(prefix='component-mismatches')
        atexit.register(shutil.rmtree, tempdir)


def decompress_open(tagfile):
    ensure_tempdir()
    decompressed = tempfile.mktemp(dir=tempdir)
    fin = gzip.GzipFile(filename=tagfile)
    with open(decompressed, 'wb') as fout:
        fout.write(fin.read())
    return open(decompressed, 'r')


def pockets(series):
    yield series
    yield '%s-security' % series
    yield '%s-proposed' % series
    yield '%s-updates' % series


priorities = {
    'required': 1,
    'important': 2,
    'standard': 3,
    'optional': 4,
    'extra': 5
}


def priority_key(priority):
    return priorities.get(priority, 6)


def print_section(options, header, items):
    print("%s:" % header)
    print("-" * (len(header) + 1))
    print()
    for item in items:
        print(item)
    print()

    if options.html_output is not None:
        print("<h2>%s</h2>" % escape(header), file=options.html_output)
        print("<ul>", file=options.html_output)
        for item in items:
            print("<li>%s</li>" % escape(item), file=options.html_output)
        print("</ul>", file=options.html_output)


def process(options, series, components, arches):
    archive = os.path.expanduser('~/mirror/ubuntu/')

    pkgcomp = defaultdict(lambda: defaultdict(list))
    pkgsect = defaultdict(lambda: defaultdict(list))
    pkgprio = defaultdict(lambda: defaultdict(list))
    for suite in pockets(series):
        for component in components:
            for arch in arches:
                try:
                    binaries_path = "%s/dists/%s/%s/binary-%s/Packages.gz" % (
                        archive, suite, component, arch)
                    binaries = apt_pkg.TagFile(decompress_open(binaries_path))
                except IOError:
                    continue
                suite_arch = '%s/%s' % (suite, arch)
                for section in binaries:
                    if 'Package' in section:
                        pkg = section['Package']
                        pkgcomp[pkg][component].append(suite_arch)
                        if 'Section' in section:
                            pkgsect[pkg][section['Section']].append(suite_arch)
                        if 'Priority' in section:
                            pkgprio[pkg][section['Priority']].append(
                                suite_arch)

    packages = sorted(pkgcomp)

    items = []
    for pkg in packages:
        if len(pkgcomp[pkg]) > 1:
            out = []
            for component in sorted(pkgcomp[pkg]):
                out.append("%s [%s]" %
                           (component,
                            ' '.join(sorted(pkgcomp[pkg][component]))))
            items.append("%s: %s" % (pkg, ' '.join(out)))
    print_section(
        options, "Packages with inconsistent components between pockets",
        items)

    items = []
    for pkg in packages:
        if pkg in pkgsect and len(pkgsect[pkg]) > 1:
            out = []
            for section in sorted(pkgsect[pkg]):
                out.append("%s [%s]" %
                           (section,
                            ' '.join(sorted(pkgsect[pkg][section]))))
            items.append("%s: %s" % (pkg, ' '.join(out)))
    print_section(
        options, "Packages with inconsistent sections between pockets", items)

    items = []
    for pkg in packages:
        if pkg in pkgprio and len(pkgprio[pkg]) > 1:
            out = []
            for priority in sorted(pkgprio[pkg], key=priority_key):
                out.append("%s [%s]" %
                           (priority,
                            ' '.join(sorted(pkgprio[pkg][priority]))))
            items.append("%s: %s" % (pkg, ' '.join(out)))
    print_section(
        options, "Packages with inconsistent priorities between pockets",
        items)


def main():
    parser = OptionParser(
        description='Check for override mismatches between pockets.')
    parser.add_option(
        "-l", "--launchpad", dest="launchpad_instance", default="production")
    parser.add_option('-o', '--output-file', help='output to this file')
    parser.add_option('--html-output-file', help='output HTML to this file')
    parser.add_option('-s', '--series',
                      help='check these series (comma-separated)')
    options, args = parser.parse_args()

    launchpad = Launchpad.login_with(
        "pocket-mismatches", options.launchpad_instance)
    if options.series is not None:
        all_series = options.series.split(',')
    else:
        all_series = reversed([
            series.name
            for series in launchpad.distributions["ubuntu"].series
            if series.status in ("Supported", "Current Stable Release")])
    components = ["main", "restricted", "universe", "multiverse"]
    arches = ["amd64", "arm64", "armhf", "i386", "ppc64el", "s390x"]

    if options.output_file is not None:
        sys.stdout = open('%s.new' % options.output_file, 'w')
    if options.html_output_file is not None:
        options.html_output = open('%s.new' % options.html_output_file, 'w')
    else:
        options.html_output = None

    options.timestamp = time.strftime('%a %b %e %H:%M:%S %Z %Y')
    print('Generated: %s' % options.timestamp)
    print()

    if options.html_output is not None:
        all_series_str = escape(", ".join(all_series))
        print(dedent("""\
            <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
             "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
            <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
            <head>
              <meta http-equiv="Content-Type"
                    content="text/html; charset=utf-8" />
              <title>Pocket mismatches for %s</title>
              <style type="text/css">
                body { background: #CCCCB0; color: black; }
              </style>
            </head>
            <body>
            <h1>Pocket mismatches for %s</h1>
            """) % (all_series_str, all_series_str),
            file=options.html_output)

    for series in all_series:
        process(options, series, components, arches)

    if options.html_output_file is not None:
        print(
            "<p><small>Generated: %s</small></p>" % escape(options.timestamp),
            file=options.html_output)
        print("</body></html>", file=options.html_output)
        options.html_output.close()
        os.rename(
            '%s.new' % options.html_output_file, options.html_output_file)
    if options.output_file is not None:
        sys.stdout.close()
        os.rename('%s.new' % options.output_file, options.output_file)


if __name__ == '__main__':
    main()