Python Kata

gilded.py

# ======================================
# Specification
# ======================================

# We are a small inn with a prime location that buy and sell only the finest goods.
# Unfortunately, our goods are constantly degrading in quality as they approach their sell by date. We
# have a system in place that updates our inventory for us. It was developed by a no-nonsense type named
# Leeroy, who has moved on to new adventures.

# 	- All items have a SellIn value which denotes the number of days we have to sell the item
# 	- All items have a Quality value which denotes how valuable the item is
# 	- At the end of each day our system lowers both values for every item

# Pretty simple, right? Well this is where it gets interesting:

# 	- Once the sell by date has passed, Quality degrades twice as fast
# 	- The Quality of an item is never negative
# 	- The Quality of an item is never more than 50
# 	- Item named "Aged Brie" actually increases in Quality the older it gets
# 	- Item named "Sulfuras", being a legendary item, never has to be sold or decreases in Quality
# 	- Item named "Backstage passes", like "Aged Brie", increases in Quality as its SellIn value approaches;
# 	- Item named "Backstage passes" Quality increases by 2 when there are 10 days or less to sell and by 3 
#     when there are 5 days or less to sell.

# Feel free to make any changes to the UpdateQuality method and add any new code as long as everything
# still works correctly. However, do not alter the Item class or Items property.

# Just for clarification, an item can never have its Quality increase above 50, however "Sulfuras" is a
# legendary item and as such its Quality is 80 and it never alters.

# Item Class is something like:

# class Item:
#     def __init__(self, name, sell_in, quality):
#         self.name = name
#         self.sell_in = sell_in
#         self.quality = quality

#     def __repr__(self):
#         return "%s, %s, %s" % (self.name, self.sell_in, self.quality)


class GildedRose(object):
    def __init__(self, items):
        self.items = items

    def update_quality(self):
        for item in self.items:
            if item.name != "Aged Brie" and item.name != "Backstage passes":
                if item.quality > 0:
                    if item.name != "Sulfuras":
                        item.quality = item.quality - 1
            else:
                if item.quality < 50:
                    item.quality = item.quality + 1
                    if item.name == "Backstage passes":
                        if item.sell_in < 11:
                            if item.quality < 50:
                                item.quality = item.quality + 1
                        if item.sell_in < 6:
                            if item.quality < 50:
                                item.quality = item.quality + 1
            if item.name != "Sulfuras":
                item.sell_in = item.sell_in - 1
            if item.sell_in < 0:
                if item.name != "Aged Brie":
                    if item.name != "Backstage passes":
                        if item.quality > 0:
                            if item.name != "Sulfuras":
                                item.quality = item.quality - 1
                    else:
                        item.quality = item.quality - item.quality
                else:
                    if item.quality < 50:
                        item.quality = item.quality + 1