class Preferences(object):
    def __init__(self, database):
        self.database = database
        self.viewResults = self.database.view("feedtest/preference_by_key")

    def _valueForKey(self, key):
        try:
            resultsForKey = self.viewResults[key]
            row = iter(resultsForKey).next()
            return row.value["value"]
        except StopIteration:
            return None

    def _booleanValueForKey(self, key):
        value = self._valueForKey(key)
        if value is None:
            return False
        else:
            return value

    def isProxyConfigured(self):
        return self.proxyHost() is not None

    def proxyHost(self):
        return self._valueForKey("proxyHost")

    def proxyPort(self):
        return self._valueForKey("proxyPort")

    def showOnlyUnreadFeeds(self):
        return self._booleanValueForKey("showOnlyUnreadFeeds")

    def startMaximized(self):
        return self._booleanValueForKey("startMaximized")

    def hideReadFeedEntries(self):
        return self._booleanValueForKey("hideReadFeedEntries")

    def daysToKeepFeedEntries(self):
        days = self._valueForKey("daysToKeepFeedEntries")
        if days is not None:
            return days
        else:
            return 60

    def rollback(self):
        # this method does nothing
        pass