from datetime import timedelta
from django.core.cache import cache
from django.utils import timezone
from misago.models import MonitorItem

class Monitor(object):
    def __init__(self):
        self._cache_deleted = False
        self._items = {}
        self.refresh()

    def refresh(self):
        self._items = cache.get('monitor')
        if not self._items:
            self._items = {}
            for i in MonitorItem.objects.all():
                self._items[i.id] = [i.value, i.updated, i.type]
            cache.set('monitor', self._items)

    def __contains__(self, key):
        return key in self._items

    def __getitem__(self, key):
        return self._items[key][0]

    def __setitem__(self, key, value):
        self._items[key][0] = value
        self._items[key][1] = timezone.now()
        cache.set('monitor', self._items)
        sync_item = MonitorItem(
                                id=key,
                                value=value,
                                type=self._items[key][2],
                                updated=timezone.now()
                                )
        sync_item.save(force_update=True)
        return value

    def __delitem__(self, key):
        pass

    def increase(self, key, i=1):
        self[key] = self[key] + i

    def decrease(self, key, i=1):
        self[key] = self[key] - i

    def get(self, key, default=None):
        if not key in self._items:
            return default
        return self._items[key][0]

    def get_updated(self, key):
        if key in self._items:
            return self._items[key][1]
        return None

    def expired(self, key, seconds=5):
        return self._items[key][1] < (timezone.now() - timedelta(seconds=seconds))

    def has_key(self, key):
        return key in self._items

    def keys(self):
        return self._items.keys()

    def values(self):
        return self._items.values()

    def items(self):
        return self._items.items()

    def iterkeys(self):
        return self._items.iterkeys()

    def itervalues(self):
        return self._items.itervalues()

    def iteritems(self):
        return self._items.iteritems()