class_diagram.md

classDiagram

    AgingItem <|-- NormalItem
    AgingItem <|-- AgedBrie
    AgingItem <|-- BackstagePass
    
    class AgingItem{
      update(item)
      _age(item)
      _update_quality(item)
      _quality_change(item)
      _cap_quality(item)
    }

    class Sulfuras{
        update(item)
    }

    class NormalItem{
        _quality_change(item)
    }

    class AgedBrie{
        _quality_change(item)
    }

    class BackstagePass{
        _update_quality(item)
        _quality_change(item)
    }

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gilded_rose.py

def get_updater_for(item):
    return UPDATERS.get(item.name, UPDATERS["----default-----"])().update

UPDATERS = {
    DEFAULT_KEY: NormalItem,
    "Aged Brie": AgedBrie,
    "Backstage passes to a TAFKAL80ETC concert":
        BackstagePass,
    "Sulfuras, Hand of Ragnaros": Sulfuras
    }


class Sulfuras:
    def update(self, item):
        item.quality = 80


class AgingItem():
    def update(self, item):
        self._age(item)
        self._cap_quality(item)
        self._update_quality(item)
        self._cap_quality(item)

    def _age(self, item):
        item.sell_in = item.sell_in - 1

    def _update_quality(self, item):
        item.quality += self._quality_change(item)

    def _quality_change(self, item):
        return 0

    @staticmethod
    def _cap_quality(item):
        if item.quality < 0:
            item.quality = 0
        elif item.quality > 50:
            item.quality = 50


class NormalItem(AgingItem):

    def _quality_change(self, item):

        if item.sell_in < 0:
            return -2
        return -1


class AgedBrie(AgingItem):

    def _quality_change(self, item):
        if item.sell_in < 0:
            return 2
        return 1


class BackstagePass(AgingItem):
     
    def _update_quality(self, item):
        if item.sell_in < 0:
            item.quality = 0
        else:
            item.quality += self._quality_change(item)
            
    def _quality_change(self, item):
        if item.sell_in < 0:
            return 0
        if item.sell_in < 5:
            return 3
        if item.sell_in < 10:
            return 2
        return 1