from django import forms
from django.conf import settings
from django.contrib.auth.decorators import user_passes_test
from django.http import HttpResponseRedirect
from django.shortcuts import render_to_response
from django.template import RequestContext
from django.utils.translation import ugettext_lazy as _
import keyedcache
import logging

log = logging.getLogger('keyedcache.views')

YN = (
    ('Y', _('Yes')),
    ('N', _('No')),
    )

class CacheDeleteForm(forms.Form):
    tag = forms.CharField(label=_('Key to delete'), required=False)
    children = forms.ChoiceField(label=_('Include Children?'), choices=YN, initial="Y")
    kill_all = forms.ChoiceField(label=_('Delete all keys?'), choices=YN, initial="Y")

    def delete_cache(self):

        data = self.cleaned_data
        if data['kill_all'] == "Y":
            keyedcache.cache_delete()
            result = "Deleted all keys"
        elif data['tag']:
            keyedcache.cache_delete(data['tag'], children=data['children'])
            if data['children'] == "Y":
                result = "Deleted %s and children" % data['tag']
            else:
                result = "Deleted %s" % data['tag']
        else:
            result = "Nothing selected to delete"

        log.debug(result)
        return result

def stats_page(request):
    calls = keyedcache.CACHE_CALLS
    hits = keyedcache.CACHE_HITS

    if (calls and hits):
        rate =  float(keyedcache.CACHE_HITS)/keyedcache.CACHE_CALLS*100
    else:
        rate = 0

    try:
        running = keyedcache.cache_require()

    except keyedcache.CacheNotRespondingError:
        running = False

    ctx = RequestContext(request, {
        'cache_count' : len(keyedcache.CACHED_KEYS),
        'cache_running' : running,
        'cache_time' : settings.CACHE_TIMEOUT,
        'cache_backend' : settings.CACHE_BACKEND,
        'cache_calls' : keyedcache.CACHE_CALLS,
        'cache_hits' : keyedcache.CACHE_HITS,
        'hit_rate' : "%02.1f" % rate
    })

    return render_to_response('keyedcache/stats.html', context_instance=ctx)

stats_page = user_passes_test(lambda u: u.is_authenticated() and u.is_staff, login_url='/accounts/login/')(stats_page)

def view_page(request):
    keys = keyedcache.CACHED_KEYS.keys()

    keys.sort()

    ctx = RequestContext(request, {
        'cached_keys' : keys,
    })

    return render_to_response('keyedcache/view.html', context_instance=ctx)

view_page = user_passes_test(lambda u: u.is_authenticated() and u.is_staff, login_url='/accounts/login/')(view_page)

def delete_page(request):
    log.debug("delete_page")
    if request.method == "POST":
        form = CacheDeleteForm(request.POST)
        if form.is_valid():
            log.debug('delete form valid')
            results = form.delete_cache()
            return HttpResponseRedirect('../')
        else:
            log.debug("Errors in form: %s", form.errors)
    else:
        log.debug("new form")
        form = CacheDeleteForm()

    ctx = RequestContext(request, {
        'form' : form,
    })

    return render_to_response('keyedcache/delete.html', context_instance=ctx)

delete_page = user_passes_test(lambda u: u.is_authenticated() and u.is_staff, login_url='/accounts/login/')(delete_page)