""" Views """

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

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

import charts


@render_to('euscan/index.html')
def index(request):
    context = {
        'n_packaged': Package.objects.n_packaged(),
        'n_overlay': Package.objects.n_overlay(),
        'n_versions': Package.objects.n_versions(),
        'n_upstream': Package.objects.n_upstream(),
        'n_packages': Package.objects.count(),
        'n_herds': Herd.objects.count(),
        'n_maintainers': Maintainer.objects.count(),
    }
    try:
        context['last_scan'] = \
            EuscanResult.objects.get(
                id=EuscanResult.objects.aggregate(Max('id'))['id__max']
            ).datetime
    except EuscanResult.DoesNotExist:
        context['last_scan'] = None

    return context


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


@render_to('euscan/categories.html')
def categories(request):
    return {'categories': Package.objects.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'
    )

    if not packages:
        raise Http404
    return {'category': category, 'packages': packages}


@render_to('euscan/herds.html')
def herds(request):
    herds = Package.objects.herds()
    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.maintainers()
    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.overlays()
    return {'overlays': overlays}


@render_to('euscan/overlay.html')
def overlay(request, overlay):
    packages = Package.objects.for_overlay(overlay)
    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)