from datetime import timedelta
import operator
import time

from django.http import HttpResponseRedirect
from django.contrib.auth.decorators import \
        login_required, permission_required, user_passes_test
from django.contrib import admin
from django.contrib.admin.models import LogEntry, ADDITION
from django.contrib.auth.models import User
from django.contrib.contenttypes.models import ContentType
from django.db import transaction
from django.db.models import Count, Max
from django.http import Http404
from django.shortcuts import get_object_or_404, render
from django.views.decorators.cache import never_cache
from django.utils.encoding import force_unicode
from django.utils.http import http_date
from django.utils.timezone import now

from .forms import ProfileForm, UserProfileForm, NewUserForm
from .models import UserProfile
from .reports import available_reports
from main.models import Package
from main.models import Arch, Repo
from news.models import News
from packages.models import PackageRelation, Signoff, FlagRequest
from packages.utils import get_signoff_groups
from todolists.models import TodolistPackage
from todolists.utils import get_annotated_todolists
from .utils import get_annotated_maintainers


@login_required
def index(request):
    """The developer dashboard."""
    if request.user.is_authenticated():
        inner_q = PackageRelation.objects.filter(user=request.user)
    else:
        inner_q = PackageRelation.objects.none()
    inner_q = inner_q.values('pkgbase')

    flagged = Package.objects.normal().filter(
            flag_date__isnull=False, pkgbase__in=inner_q).order_by('pkgname')

    todopkgs = TodolistPackage.objects.select_related(
            'todolist', 'pkg', 'arch', 'repo').exclude(
            status=TodolistPackage.COMPLETE).filter(removed__isnull=True)
    todopkgs = todopkgs.filter(pkgbase__in=inner_q).order_by(
            'todolist__name', 'pkgname')

    todolists = get_annotated_todolists(incomplete_only=True)

    signoffs = sorted(get_signoff_groups(user=request.user),
            key=operator.attrgetter('pkgbase'))

    page_dict = {
            'todos': todolists,
            'flagged': flagged,
            'todopkgs': todopkgs,
            'signoffs': signoffs,
            'reports': available_reports(),
    }

    return render(request, 'devel/index.html', page_dict)


@login_required
def stats(request):
    """The second half of the dev dashboard."""
    arches = Arch.objects.all().annotate(
            total_ct=Count('packages'), flagged_ct=Count('packages__flag_date'))
    repos = Repo.objects.all().annotate(
            total_ct=Count('packages'), flagged_ct=Count('packages__flag_date'))
    # the join is huge unless we do this separately, so merge the result here
    repo_maintainers = dict(Repo.objects.order_by().filter(
            userprofile__user__is_active=True).values_list('id').annotate(
            Count('userprofile')))
    for repo in repos:
        repo.maintainer_ct = repo_maintainers.get(repo.id, 0)

    maintainers = get_annotated_maintainers()

    maintained = PackageRelation.objects.filter(
            type=PackageRelation.MAINTAINER).values('pkgbase')
    total_orphans = Package.objects.exclude(pkgbase__in=maintained).count()
    total_flagged_orphans = Package.objects.filter(
            flag_date__isnull=False).exclude(pkgbase__in=maintained).count()
    total_updated = Package.objects.filter(packager__isnull=True).count()
    orphan = {
            'package_count': total_orphans,
            'flagged_count': total_flagged_orphans,
            'updated_count': total_updated,
    }

    page_dict = {
            'arches': arches,
            'repos': repos,
            'maintainers': maintainers,
            'orphan': orphan,
    }

    return render(request, 'devel/stats.html', page_dict)


@login_required
def clock(request):
    devs = User.objects.filter(is_active=True).order_by(
            'first_name', 'last_name').select_related('userprofile')

    latest_news = dict(News.objects.filter(
            author__is_active=True).values_list('author').order_by(
            ).annotate(last_post=Max('postdate')))
    latest_package = dict(Package.objects.filter(
            packager__is_active=True).values_list('packager').order_by(
            ).annotate(last_build=Max('build_date')))
    latest_signoff = dict(Signoff.objects.filter(
            user__is_active=True).values_list('user').order_by(
            ).annotate(last_signoff=Max('created')))
    # The extra() bit ensures we can use our 'user_id IS NOT NULL' index
    latest_flagreq = dict(FlagRequest.objects.filter(
            user__is_active=True).extra(
            where=['user_id IS NOT NULL']).values_list('user_id').order_by(
            ).annotate(last_flagrequest=Max('created')))
    latest_log = dict(LogEntry.objects.filter(
            user__is_active=True).values_list('user').order_by(
            ).annotate(last_log=Max('action_time')))

    for dev in devs:
        dates = [
            latest_news.get(dev.id, None),
            latest_package.get(dev.id, None),
            latest_signoff.get(dev.id, None),
            latest_flagreq.get(dev.id, None),
            latest_log.get(dev.id, None),
            dev.last_login,
        ]
        dates = [d for d in dates if d is not None]
        if dates:
            dev.last_action = max(dates)
        else:
            dev.last_action = None

    current_time = now()
    page_dict = {
            'developers': devs,
            'utc_now': current_time,
    }

    response = render(request, 'devel/clock.html', page_dict)
    if not response.has_header('Expires'):
        expire_time = current_time.replace(second=0, microsecond=0)
        expire_time += timedelta(minutes=1)
        expire_time = time.mktime(expire_time.timetuple())
        response['Expires'] = http_date(expire_time)
    return response


@login_required
@never_cache
def change_profile(request):
    profile, _ = UserProfile.objects.get_or_create(user=request.user)
    if request.POST:
        form = ProfileForm(request.POST)
        profile_form = UserProfileForm(request.POST, request.FILES,
                instance=profile)
        if form.is_valid() and profile_form.is_valid():
            request.user.email = form.cleaned_data['email']
            if form.cleaned_data['passwd1']:
                request.user.set_password(form.cleaned_data['passwd1'])
            with transaction.atomic():
                request.user.save()
                profile_form.save()
            return HttpResponseRedirect('/devel/')
    else:
        form = ProfileForm(initial={'email': request.user.email})
        profile_form = UserProfileForm(instance=profile)
    return render(request, 'devel/profile.html',
            {'form': form, 'profile_form': profile_form})


@login_required
def report(request, report_name, username=None):
    available = {report.slug: report for report in available_reports()}
    report = available.get(report_name, None)
    if report is None:
        raise Http404

    packages = Package.objects.normal()
    user = None
    if username:
        user = get_object_or_404(User, username=username, is_active=True)
        maintained = PackageRelation.objects.filter(user=user,
                type=PackageRelation.MAINTAINER).values('pkgbase')
        packages = packages.filter(pkgbase__in=maintained)

    maints = User.objects.filter(id__in=PackageRelation.objects.filter(
        type=PackageRelation.MAINTAINER).values('user'))

    packages = report.packages(packages, username)
    arches = {pkg.arch for pkg in packages}
    repos = {pkg.repo for pkg in packages}
    context = {
        'all_maintainers': maints,
        'title': report.description,
        'report': report,
        'maintainer': user,
        'packages': packages,
        'arches': sorted(arches),
        'repos': sorted(repos),
        'column_names': report.names,
        'column_attrs': report.attrs,
    }
    return render(request, 'devel/packages.html', context)


def log_addition(request, obj):
    """Cribbed from ModelAdmin.log_addition."""
    LogEntry.objects.log_action(
        user_id         = request.user.pk,
        content_type_id = ContentType.objects.get_for_model(obj).pk,
        object_id       = obj.pk,
        object_repr     = force_unicode(obj),
        action_flag     = ADDITION,
        change_message  = "Added via Create New User form."
    )


@permission_required('auth.add_user')
@never_cache
def new_user_form(request):
    if request.POST:
        form = NewUserForm(request.POST)
        if form.is_valid():
            with transaction.atomic():
                form.save()
                log_addition(request, form.instance.user)
            return HttpResponseRedirect('/admin/auth/user/%d/' % \
                    form.instance.user.id)
    else:
        form = NewUserForm()

    context = {
        'description': '''A new user will be created with the
            following properties in their profile. A random password will be
            generated and the user will be e-mailed with their account details
            n plaintext.''',
        'form': form,
        'title': 'Create User',
        'submit_text': 'Create User'
    }
    return render(request, 'general_form.html', context)


@user_passes_test(lambda u: u.is_superuser)
def admin_log(request, username=None):
    user = None
    if username:
        user = get_object_or_404(User, username=username)
    context = {
        'title': "Admin Action Log",
        'log_user':  user,
    }
    context.update(admin.site.each_context())
    return render(request, 'devel/admin_log.html', context)

# vim: set ts=4 sw=4 et: