from django.shortcuts import render_to_response
from django.template import RequestContext
from django.contrib.auth.decorators import login_required
from django.db.models import Count
from django.http import HttpResponseRedirect
from main.models import Plugin, PluginPermission


from buyable.models import Purchase, Buyable

@login_required
def startpage(request):
	''' Diese Funktion wird wahrscheinlich viel Last erzeugen, da 
	sie ueber mehrere Tabellen joined,filtered und wieder reduced.
	'''
	allMost = Purchase.objects.filter(isDeposit=False).values('buyable__name', 'buyable__id').annotate(num_buys=Count('buyable')).order_by('-num_buys')
	usersMost = Purchase.objects.filter(isDeposit=False).values('buyable__name','buyable__id').filter(order__user=request.user.id).annotate(num_buys=Count('buyable')).order_by('-num_buys')
	usersLast = Purchase.objects.filter(isDeposit=False).values('buyable__name','buyable__id').filter(order__user=request.user.id).order_by('-order__dateTime')
	return render_to_response("main/startpage.html", {'allMost' : allMost,'usersMost': usersMost, 'usersLast' : usersLast[:12]}, RequestContext(request))

def register(request):
	""" The "no registration available" page... """
	return render_to_response("registration/register.html", RequestContext(request))


def getPluginDict(request):
	""" Generate a dict containing the users plugin information. """
	plugins = Plugin.objects.all()
	allowed = Plugin.objects.filter(pluginpermission__user=request.user)
	unallowed = Plugin.objects.exclude(pluginpermission__user=request.user)
	perms = PluginPermission.objects.filter(user=request.user)
	
	return {'plugins': plugins, 'allowed': allowed, 'unallowed': unallowed, 'permissions': perms}

@login_required
def settings(request):
	""" Render settings page. """
	return render_to_response("settings/settings.html", getPluginDict(request), RequestContext(request))

@login_required
def pluginPermission(request, method, pluginId):
	""" View to edit the users :class:`Plugin` permissions. """
	plugin = None
	try:
		plugin = Plugin.objects.get(id=pluginId)
	except Plugin.DoesNotExist:
		d = getPluginDict(request)
		d['pluginerror'] = "Ein Plugin mit der angegebenen ID existiert nicht"
		return render_to_response("settings/settings.html", d, RequestContext(request))
	
	if method == "allow":
		try:
			p = PluginPermission.objects.get(user=request.user, plugin=plugin)
			d = getPluginDict(request)
			d['pluginerror'] = "Dieses Plugin wurde bereits erlaubt"
			return render_to_response("settings/settings.html", d, RequestContext(request))
		except PluginPermission.DoesNotExist:
			p = PluginPermission(user=request.user, plugin=plugin)
			p.save()
	else:
		try:
			p = PluginPermission.objects.get(user=request.user, plugin=plugin)
			p.delete()
		except PluginPermission.DoesNotExist:
			d = getPluginDict(request)
			d['pluginerror'] = "Keine Berechtigungen für dieses Plugin gefunden - kann also auch nicht zurückgezogen werden"
			return render_to_response("settings/settings.html", d, RequestContext(request))
	return HttpResponseRedirect("/user/settings/")

@login_required
def pluginAuthblob(request, pluginId):
	""" View to edit the users :attr:`authblob <PluginPermission.authblob>`. """
	if request.method != "POST":
		return HttpResponseRedirect("/user/settings/")
	plugin = None
	try:
		plugin = Plugin.objects.get(id=pluginId)
	except Plugin.DoesNotExist:
		d = getPluginDict(request)
		d['pluginerror'] = "Ein Plugin mit der angegebenen ID existiert nicht"
		return render_to_response("settings/settings.html", d, RequestContext(request))
	
	p = None
	try:
		p = PluginPermission.objects.get(user=request.user, plugin=plugin)
	except PluginPermission.DoesNotExist:
		d = getPluginDict(request)
		d['pluginerror'] = "Vor dem editieren vom Authblob muss das Plugin ersteinmal erlaubt werden"
		return render_to_response("settings/settings.html", d, RequestContext(request))

	if not p.plugin.userCanWriteAuthblob or not request.POST.has_key("authblob"):
		d = getPluginDict(request)
		d['pluginerror'] = "Der Authblob darf f&uuml;r dieses Plugin nicht vom User ver&auml;ndert werden (oder der Authblob war kaputt)"
		return render_to_response("settings/settings.html", d, RequestContext(request))
	
	if p.plugin.uniqueAuthblob and PluginPermission.objects.filter(plugin=plugin, authblob=request.POST["authblob"]).count() > 0:
		d = getPluginDict(request)
		d['pluginerror'] = "Achtung! Dein Authblob wird bereits von einer anderen Person benutzt. Bitte w&auml;hle einen anderen (eindeutigen) Authblob!"
		return render_to_response("settings/settings.html", d, RequestContext(request))
	
	p.authblob = request.POST['authblob']
	p.save()
	d = getPluginDict(request)
	d['pluginmsg'] = "Authblob erfolgreich ge&auml;ndert"
	return render_to_response("settings/settings.html", d, RequestContext(request))