from annoying.decorators import render_to
from django.http import Http404
from django.shortcuts import get_object_or_404
from django.db.models import Sum, Max

from models import Version, Package, Herd, Maintainer, EuscanResult, VersionLog
from forms import WorldForm, PackagesForm

import charts

""" Views """


@render_to('euscan/index.html')
def index(request):
    ctx = {}
    ctx['n_packaged'] = charts.xint(
        Package.objects.aggregate(Sum('n_packaged'))['n_packaged__sum']
    )
    ctx['n_overlay'] = charts.xint(
        Package.objects.aggregate(Sum('n_overlay'))['n_overlay__sum']
    )
    ctx['n_versions'] = charts.xint(
        Package.objects.aggregate(Sum('n_versions'))['n_versions__sum']
    )
    ctx['n_upstream'] = ctx['n_versions'] - ctx['n_packaged'] - \
                        ctx['n_overlay']
    ctx['n_packages'] = Package.objects.count()
    ctx['n_herds'] = Herd.objects.count()
    ctx['n_maintainers'] = Maintainer.objects.count()

    try:
        ctx['last_scan'] = EuscanResult.objects.get(
                id=EuscanResult.objects.aggregate(Max('id'))['id__max']
            ).datetime
    except EuscanResult.DoesNotExist:
        ctx['last_scan'] = None

    return ctx


@render_to('euscan/logs.html')
def logs(request):
    return {}


@render_to('euscan/categories.html')
def categories(request):
    categories = Package.objects.values('category').annotate(
        n_packaged=Sum('n_packaged'),
        n_overlay=Sum('n_overlay'),
        n_versions=Sum('n_versions')
    )

    return {'categories': categories}


@render_to('euscan/category.html')
def category(request, category):
    packages = Package.objects.filter(category=category)
    packages = packages.select_related(
        'last_version_gentoo', 'last_version_overlay', 'last_version_upstream'
    )
    print dir(packages[0])
    if not packages:
        raise Http404
    return {'category': category, 'packages': packages}


@render_to('euscan/herds.html')
def herds(request):
    # FIXME: optimize the query, it uses 'LEFT OUTER JOIN' instead of
    # 'INNER JOIN'
    herds = Package.objects.filter(herds__isnull=False)
    herds = herds.values('herds__herd').annotate(
        n_packaged=Sum('n_packaged'),
        n_overlay=Sum('n_overlay'),
        n_versions=Sum('n_versions'))
    return {'herds': herds}


@render_to('euscan/herd.html')
def herd(request, herd):
    herd = get_object_or_404(Herd, herd=herd)
    packages = Package.objects.filter(herds__id=herd.id)
    packages = packages.select_related(
        'last_version_gentoo', 'last_version_overlay', 'last_version_upstream'
    )
    return {'herd': herd, 'packages': packages}


@render_to('euscan/maintainers.html')
def maintainers(request):
    maintainers = Package.objects.filter(maintainers__isnull=False)
    maintainers = maintainers.values(
        'maintainers__id', 'maintainers__name', 'maintainers__email'
    )
    maintainers = maintainers.annotate(
        n_packaged=Sum('n_packaged'),
        n_overlay=Sum('n_overlay'),
        n_versions=Sum('n_versions')
    )

    return {'maintainers': maintainers}


@render_to('euscan/maintainer.html')
def maintainer(request, maintainer_id):
    maintainer = get_object_or_404(Maintainer, id=maintainer_id)
    packages = Package.objects.filter(maintainers__id=maintainer.id)
    packages = packages.select_related(
        'last_version_gentoo', 'last_version_overlay', 'last_version_upstream'
    )
    return {'maintainer': maintainer, 'packages': packages}


@render_to('euscan/overlays.html')
def overlays(request):
    overlays = Package.objects.values('version__overlay')
    overlays = overlays.exclude(version__overlay='')
    overlays = overlays.distinct()
    return {'overlays': overlays}


@render_to('euscan/overlay.html')
def overlay(request, overlay):
    packages = Package.objects.values('id', 'name', 'category',
                                      'n_versions', 'n_packaged',
                                      'n_overlay')
    packages = packages.filter(version__overlay=overlay).distinct()
    if not packages:
        raise Http404
    return {'overlay': overlay, 'packages': packages}


@render_to('euscan/package.html')
def package(request, category, package):

    def version_key(version):
        from distutils.version import StrictVersion, LooseVersion

        version = version.version
        try:
            return StrictVersion(version)
        # in case of abnormal version number, fall back to LooseVersion
        except ValueError:
            return LooseVersion(version)

    package = get_object_or_404(Package, category=category, name=package)
    package.homepages = package.homepage.split(' ')
    packaged = Version.objects.filter(package=package, packaged=True)
    upstream = Version.objects.filter(package=package, packaged=False)

    packaged = sorted(packaged, key=version_key)
    upstream = sorted(upstream, key=version_key)

    log = EuscanResult.objects.filter(package=package).\
                               order_by('-datetime')[:1]
    log = log[0] if log else None
    vlog = VersionLog.objects.filter(package=package).order_by('-id')

    return {'package': package, 'packaged': packaged,
            'upstream': upstream, 'log': log, 'vlog': vlog}


@render_to('euscan/world.html')
def world(request):
    world_form = WorldForm()
    packages_form = PackagesForm()

    return {'world_form': world_form,
            'packages_form': packages_form}


@render_to('euscan/world_scan.html')
def world_scan(request):
    packages = []

    if 'world' in request.FILES:
        data = request.FILES['world'].read()
    elif 'packages' in request.POST:
        data = request.POST['packages']
    else:
        data = ""

    data = data.replace("\r", "")

    for pkg in data.split('\n'):
        try:
            if '/' in pkg:
                cat, pkg = pkg.split('/')
                packages.extend(Package.objects.filter(category=cat, name=pkg))
            else:
                packages.extend(Package.objects.filter(name=pkg))
        except:
            pass

    return {'packages': packages}


@render_to("euscan/about.html")
def about(request):
    return {}


@render_to("euscan/api.html")
def api(request):
    return {}


@render_to("euscan/statistics.html")
def statistics(request):
    return {}


def chart(request, **kwargs):
    from django.views.static import serve

    chart = kwargs['chart'] if 'chart' in kwargs else None

    if 'maintainer_id' in kwargs:
        kwargs['maintainer'] = get_object_or_404(
            Maintainer,
            id=kwargs['maintainer_id']
        )
    if 'herd' in kwargs:
        kwargs['herd'] = get_object_or_404(Herd, herd=kwargs['herd'])

    for kw in ('-small', '-weekly', '-monthly', '-yearly'):
        if chart.endswith(kw):
            if kw in ('-weekly', '-monthly', '-yearly'):
                kwargs['period'] = kw
            kwargs[kw] = True
            chart = chart[:-len(kw)]

    if chart == 'pie-packages':
        path = charts.pie_packages(**kwargs)
    elif chart == 'pie-versions':
        path = charts.pie_versions(**kwargs)
    elif chart == 'packages':
        path = charts.packages(**kwargs)
    elif chart == 'versions':
        path = charts.versions(**kwargs)
    else:
        raise Http404()

    return serve(request, path, document_root=charts.CHARTS_ROOT)


def chart_maintainer(request, **kwargs):
    return chart(request, **kwargs)


def chart_herd(request, **kwargs):
    return chart(request, **kwargs)


def chart_category(request, **kwargs):
    return chart(request, **kwargs)