# -*- coding: utf-8 -*-
# date: 23 Mai 2009

class Priority:
    def __init__(self, name, id, color=None):
        self.name = name.__str__()
        self.id = id

        if color is not None:
            self.color = color
        else:
            self.color = id
            
    def getId(self):
        return self.id

    def getName(self):
        return self.name

    def getColor(self):
        return self.color

    def __str__(self):
        return self.getName()

class Priorities:
    __shared_state = {}
    priorities = {}
    prioritiesMap = {}

    def __init__(self):
        self.__dict__ = self.__shared_state

        if len(self.priorities) == 0:
            self.__add__(Priority('Low', -100))
            self.__add__(Priority('Normal', 0))
            self.__add__(Priority('High', 100))
        
    def __getitem__(self, id):
        return self.priorities[id]

    def __setitem__(self, id, priority):
        self.priorities[id] = priority
        self.prioritiesMap[priority.getName()] = priority

    def __delitem__(self, id):
        priority = prioritie[key]
        del(self.priorities[key])
        del(self.prioritiesMap[priority.getName()])

    def remove(self, priority):
        del(self.priorities[key])
        del(self.prioritiesMap[priority.getName()])
        
    def __contians__(self, priority):
        return (priority in self.priorities)

    def append(self, priority):
        self.__setitem__(priority.getId(), priority)

    def __add__(self, priority):
        self.__setitem__(priority.getId(), priority)
        return self

    def __iter__(self):
        return self.priorities.__iter__()

    def getPriority(self, id=None, name=None):
        try:
            if id is not None:
                return self[id]

            if name is not None:
                return self.prioritiesMap[name]
        except(KeyError):
            if name is None:
                name = id

            if id is None:
                id = name

            priority = Priority(id, name)
            self.__add__(priority)            
            return priority
            
        return None