rewrite: Begin shop module.

bot/modules/shop/shops/base.py

@@ -0,0 +1,81 @@
+import discord
+from discord.ui.button import Button
+
+from meta import LionBot
+
+from utils import ui
+
+from ..data import ShopData
+
+
+class MemberInventory:
+    """
+    An interface to the member's inventory.
+    """
+    def __init__(self, bot, shop_data, lion, inventory):
+        self.bot = bot
+        self.lion = lion
+        self.guildid = lion.guildid
+        self.userid = lion.userid
+
+        # A list of InventoryItems held by this user
+        self.inventory = inventory
+
+    @classmethod
+    async def fetch(cls, bot: LionBot, shop_data: ShopData, guildid: int, userid: int):
+        lion = await bot.core.lions.fetch(guildid, userid)
+        inventory = await shop_data.fetch_where(guildid=guildid, userid=userid)
+        return cls(bot, shop_data, lion, inventory)
+
+    async def refresh(self):
+        """
+        Refresh the data for this member.
+        """
+        self.lion = self.bot.core.lions.fetch(self.guild.id, self.user.id)
+
+        data = self.bot.get_cog('Shopping').data
+        self.inventory_items = await data.InventoryItem.fetch_where(userid=self.userid, guildid=self.guildid)
+
+
+class ShopItem:
+    """
+    ABC representing a purchasable guild shop item.
+    """
+    def __init__(self, data):
+        self.data = data
+
+    async def purchase(self, userid):
+        """
+        Called when a member purchases this item.
+        """
+        ...
+
+
+class Shop:
+    """
+    Base class representing a Shop for a particular member.
+    """
+    def __init__(self, bot: LionBot, shop_data: ShopData, member: discord.Member):
+        self.bot = bot
+        self.data = shop_data
+        self.member = member
+        self.guild = member.guild
+
+        # A list of ShopItems that are currently visible to the member
+        self.items = []
+
+        # Current inventory for the member
+        self.inventory = None
+
+    async def refresh(self):
+        ...
+
+
+class Store(ui.LeoUI):
+    """
+    Base UI for the different shops.
+    """
+    def __init__(self, bot: LionBot, data, shops):
+        self.bot = bot
+        self.data = data
+        self.shops = shops