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65 lines
2.4 KiB
Python
65 lines
2.4 KiB
Python
import brmbar
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from .Currency import Currency
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from .Account import Account
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import psycopg2
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from contextlib import closing
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class Shop:
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""" BrmBar Shop
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Business logic so that only interaction is left in the hands
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of the frontend scripts. """
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def __init__(self, db, currency, profits, cash):
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self.db = db
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self.currency = currency # brmbar.Currency
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self.profits = profits # income brmbar.Account for brmbar profit margins on items
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self.cash = cash # our operational ("wallet") cash account
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@classmethod
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def new_with_defaults(cls, db):
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return cls(db,
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currency = Currency.default(db),
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profits = Account.load(db, name = "BrmBar Profits"),
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cash = Account.load(db, name = "BrmBar Cash"))
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def sell(self, item, user, amount = 1):
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# Sale: Currency conversion from item currency to shop currency
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(buy, sell) = item.currency.rates(self.currency)
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cost = amount * sell
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profit = amount * (sell - buy)
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transaction = self._transaction(responsible = user, description = "BrmBar sale of {}x {} to {}".format(amount, item.name, user.name))
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item.credit(transaction, amount, user.name)
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user.debit(transaction, cost, item.name) # debit (increase) on a _debt_ account
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self.profits.debit(transaction, profit, "Margin on " + item.name)
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self.db.commit()
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return cost
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def sell_for_cash(self, item, amount = 1):
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# Sale: Currency conversion from item currency to shop currency
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(buy, sell) = item.currency.rates(self.currency)
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cost = amount * sell
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profit = amount * (sell - buy)
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transaction = self._transaction(description = "BrmBar sale of {}x {} for cash".format(amount, item.name))
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item.credit(transaction, amount, "Cash")
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self.cash.debit(transaction, cost, item.name)
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self.profits.debit(transaction, profit, "Margin on " + item.name)
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self.db.commit()
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return cost
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def add_credit(self, credit, user):
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transaction = self._transaction(responsible = user, description = "BrmBar credit replenishment for " + user.name)
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self.cash.debit(transaction, credit, user.name)
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user.credit(transaction, credit, "Credit replenishment")
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self.db.commit()
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def _transaction(self, responsible = None, description = None):
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with closing(self.db.cursor()) as cur:
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cur.execute("INSERT INTO transactions (responsible, description) VALUES (%s, %s) RETURNING id",
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[responsible.id if responsible else None, description])
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transaction = cur.fetchone()[0]
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return transaction
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