#!/usr/bin/env python2.7

# Check for override mismatches between architectures
# Copyright (C) 2005, 2008, 2009, 2010, 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 csv
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

from charts import make_chart, make_chart_header


tempdir = None


def ensure_tempdir():
    global tempdir
    if not tempdir:
        tempdir = tempfile.mkdtemp(prefix='architecture-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 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, suite, components, arches):
    results = {}
    results["time"] = int(options.time * 1000)

    archive = os.path.expanduser('~/mirror/ubuntu/')

    pkgcomp = defaultdict(lambda: defaultdict(list))
    pkgsect = defaultdict(lambda: defaultdict(list))
    pkgprio = defaultdict(lambda: defaultdict(list))
    archall = defaultdict(set)
    archany = set()
    for component in components:
        for arch in arches:
            for suffix in '', '/debian-installer':
                binaries_path = "%s/dists/%s/%s%s/binary-%s/Packages.gz" % (
                    archive, suite, component, suffix, arch)
                for section in apt_pkg.TagFile(decompress_open(binaries_path)):
                    if 'Package' in section:
                        pkg = section['Package']
                        pkgcomp[pkg][component].append(arch)
                        if 'Section' in section:
                            pkgsect[pkg][section['Section']].append(arch)
                        if 'Priority' in section:
                            pkgprio[pkg][section['Priority']].append(arch)
                        if 'Architecture' in section:
                            if section['Architecture'] == 'all':
                                archall[pkg].add(arch)
                            else:
                                archany.add(pkg)

    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 architectures",
        items)
    results["inconsistent components"] = len(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 architectures",
        items)
    results["inconsistent sections"] = len(items)

    items = []
    for pkg in packages:
        if pkg in pkgprio and len(pkgprio[pkg]) > 1:
            out = []
            for priority in sorted(pkgprio[pkg]):
                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 architectures",
        items)
    results["inconsistent priorities"] = len(items)

    items = []
    archesset = set(arches)
    for pkg in packages:
        if (pkg not in archany and
                pkg in archall and len(archall[pkg]) < len(arches)):
            missing = sorted(archesset - archall[pkg])
            items.append("%s [%s]" % (pkg, ' '.join(missing)))
    print_section(
        options,
        "Architecture-independent packages missing from some architectures",
        items)
    results["missing arch-indep"] = len(items)

    return results


def main():
    parser = OptionParser(
        description='Check for override mismatches between architectures.')
    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(
        '--csv-file', help='record CSV time series data in this file')
    parser.add_option('-s', '--suite', help='check this suite')
    options, args = parser.parse_args()

    if options.suite is None:
        launchpad = Launchpad.login_anonymously(
            'architecture-mismatches', options.launchpad_instance)
        options.suite = launchpad.distributions['ubuntu'].current_series.name

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

    if options.html_output is not None:
        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>Architecture mismatches for %s</title>
              <style type="text/css">
                body { background: #CCCCB0; color: black; }
              </style>
              %s
            </head>
            <body>
            <h1>Architecture mismatches for %s</h1>
            """) % (
                escape(options.suite), make_chart_header(),
                escape(options.suite)),
            file=options.html_output)

    results = process(options, suite, components, arches)

    if options.html_output_file is not None:
        print("<h2>Over time</h2>", file=options.html_output)
        print(
            make_chart("architecture-mismatches.csv", [
                "inconsistent components",
                "inconsistent sections",
                "inconsistent priorities",
                "missing arch-indep",
                ]),
            file=options.html_output)
        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 options.csv_file is not None:
        if sys.version < "3":
            open_mode = "ab"
            open_kwargs = {}
        else:
            open_mode = "a"
            open_kwargs = {"newline": ""}
        csv_is_new = not os.path.exists(options.csv_file)
        with open(options.csv_file, open_mode, **open_kwargs) as csv_file:
            # Field names deliberately hardcoded; any changes require
            # manually rewriting the output file.
            fieldnames = [
                "time",
                "inconsistent components",
                "inconsistent sections",
                "inconsistent priorities",
                "missing arch-indep",
                ]
            csv_writer = csv.DictWriter(csv_file, fieldnames)
            if csv_is_new:
                csv_writer.writeheader()
            csv_writer.writerow(results)


if __name__ == '__main__':
    main()