import datetime

from optparse import make_option

from django.db.models import Count, Sum
from django.db.transaction import commit_on_success
from django.core.management.base import BaseCommand, CommandError

from euscanwww.euscan.models import Package, Herd, Maintainer, Version
from euscanwww.euscan.models import HerdLog, MaintainerLog, CategoryLog, WorldLog
from euscanwww.euscan import charts

class Command(BaseCommand):
    _overlays = {}
    help = 'Update counters'

    option_list = BaseCommand.option_list + (
        make_option('--quiet',
            action='store_true',
            dest='quiet',
            default=False,
            help='Be quiet'),
        make_option('--fast',
            action='store_true',
            dest='fast',
            default=False,
            help='Skip sanity checks'),
        make_option('--nolog',
            action='store_true',
            dest='nolog',
            default=False,
            help='Skip logs'),

        )

    @commit_on_success
    def handle(self, *args, **options):
        now = datetime.datetime.now()

        categories = {}
        herds = {}
        maintainers = {}

        wlog = None

        if not options['nolog']:
            wlog = WorldLog()
            wlog.datetime = now

            for cat in Package.objects.values('category').distinct():
                clog = CategoryLog()
                clog.datetime = now
                clog.category = cat['category']
                categories[clog.category] = clog

            for herd in Herd.objects.all():
                hlog = HerdLog()
                hlog.datetime = now
                hlog.herd = herd
                herds[herd.id] = hlog

            for maintainer in Maintainer.objects.all():
                mlog = MaintainerLog()
                mlog.datetime = now
                mlog.maintainer = maintainer
                maintainers[maintainer.id] = mlog

        package_queryset = Package.objects.all()

        n_versions = {}
        n_packaged = {}
        n_overlay = {}

        last_versions_gentoo = {}
        last_versions_overlay = {}
        last_versions_upstream = {}

        def add_safe(storage, key):
            if key not in storage:
                storage[key] = 1
            else:
                storage[key] += 1

        def add_last_ver(storage, version):
            key = version['package_id']
            if key not in storage:
                storage[key] = version
                return
            if version['version'].startswith('9999'):
                return
            if storage[key]['version'] < version['version']:
                storage[key] = version

        if not options['fast']:
            attrs = ['id', 'version', 'overlay', 'packaged', 'package_id']
            for version in Version.objects.all().values(*attrs):
                overlay, packaged = version['overlay'], version['packaged']
                package_id = version['package_id']

                add_safe(n_versions, package_id)

                if not packaged:
                    add_last_ver(last_versions_upstream, version)
                    continue
                if overlay == 'gentoo':
                    add_safe(n_packaged, package_id)
                    add_last_ver(last_versions_gentoo, version)
                else:
                    add_safe(n_overlay, package_id)
                    add_last_ver(last_versions_overlay, version)

        for package in package_queryset.select_related('herds', 'maintainers'):
            if not options['fast']:
                package.n_versions = n_versions.get(package.id, 0)
                package.n_packaged = n_packaged.get(package.id, 0)
                package.n_overlay = n_overlay.get(package.id, 0)

                default = {'id' : None}
                package.last_version_gentoo_id = last_versions_gentoo.get(package.id, default)['id']
                package.last_version_overlay_id = last_versions_overlay.get(package.id, default)['id']
                package.last_version_upstream_id = last_versions_upstream.get(package.id, default)['id']

                package.save()

            n_packages_gentoo = int(package.n_packaged == package.n_versions)
            n_packages_overlay = int(package.n_overlay and package.n_packaged + package.n_overlay == package.n_versions)
            n_packages_outdated = int(package.n_packaged + package.n_overlay < package.n_versions)

            def update_row(storage, key):
                storage[key].n_packages_gentoo   += n_packages_gentoo
                storage[key].n_packages_overlay  += n_packages_overlay
                storage[key].n_packages_outdated += n_packages_outdated

                storage[key].n_versions_gentoo   += package.n_packaged
                storage[key].n_versions_overlay  += package.n_overlay
                storage[key].n_versions_upstream += package.n_versions - package.n_packaged - package.n_overlay
            def update_log(storage, qs):
                for row in qs:
                    update_row(storage, row['id'])

            if not options['nolog']:
                update_log(herds, package.herds.all().values('id'))
                update_log(maintainers, package.maintainers.all().values('id'))
                update_row(categories, package.category)

                wlog.n_packages_gentoo   += n_packages_gentoo
                wlog.n_packages_overlay  += n_packages_overlay
                wlog.n_packages_outdated += n_packages_outdated

                wlog.n_versions_gentoo   += package.n_packaged
                wlog.n_versions_overlay  += package.n_overlay
                wlog.n_versions_upstream += package.n_versions - package.n_packaged - package.n_overlay

        if options['nolog']:
            return

        for clog in categories.values():
            if not options['quiet']:
                self.stdout.write('+ [cl] %s\n' % clog)
            charts.rrd_update('category-%s' % clog.category, now, clog)
            clog.save()

        for hlog in herds.values():
            if not options['quiet']:
                self.stdout.write('+ [hl] %s\n' % hlog)
            charts.rrd_update('herd-%d' % hlog.herd.id, now, hlog)
            hlog.save()

        for mlog in maintainers.values():
            if not options['quiet']:
                self.stdout.write('+ [ml] %s\n' % mlog)
            charts.rrd_update('maintainer-%d' % mlog.maintainer.id, now, mlog)
            mlog.save()

        charts.rrd_update('world', now, wlog)
        wlog.save()