From 4c7012c517b3933468a844c78ded98b0c83e9f5f Mon Sep 17 00:00:00 2001 From: TMA Date: Mon, 21 Apr 2025 12:22:22 +0200 Subject: [PATCH] #10: stored function for cash sell transaction --- brmbar3/brmbar/Shop.py | 25 ++-- brmbar3/schema/0010-shop-sell-for-cash.sql | 141 +++++++++++++++++++++ 2 files changed, 157 insertions(+), 9 deletions(-) create mode 100644 brmbar3/schema/0010-shop-sell-for-cash.sql diff --git a/brmbar3/brmbar/Shop.py b/brmbar3/brmbar/Shop.py index f005d7b..0e9b3b2 100644 --- a/brmbar3/brmbar/Shop.py +++ b/brmbar3/brmbar/Shop.py @@ -46,18 +46,25 @@ class Shop: #return cost def sell_for_cash(self, item, amount = 1): - # Sale: Currency conversion from item currency to shop currency - (buy, sell) = item.currency.rates(self.currency) - cost = amount * sell - profit = amount * (sell - buy) + cost = self.db.execute_and_fetch( + "SELECT public.sell_item_for_cash(%s, %s, %s, %s, %s)", + [item.id, amount, user.id, self.currency.id, f"BrmBar sale of {amount}x {item.name} for cash"] + )[0]#[0] - transaction = self._transaction(description = "BrmBar sale of {}x {} for cash".format(amount, item.name)) - item.credit(transaction, amount, "Cash") - self.cash.debit(transaction, cost, item.name) - self.profits.debit(transaction, profit, "Margin on " + item.name) self.db.commit() - return cost + ## Sale: Currency conversion from item currency to shop currency + #(buy, sell) = item.currency.rates(self.currency) + #cost = amount * sell + #profit = amount * (sell - buy) + + #transaction = self._transaction(description = "BrmBar sale of {}x {} for cash".format(amount, item.name)) + #item.credit(transaction, amount, "Cash") + #self.cash.debit(transaction, cost, item.name) + #self.profits.debit(transaction, profit, "Margin on " + item.name) + #self.db.commit() + + #return cost def undo_sale(self, item, user, amount = 1): # Undo sale; rarely needed diff --git a/brmbar3/schema/0010-shop-sell-for-cash.sql b/brmbar3/schema/0010-shop-sell-for-cash.sql new file mode 100644 index 0000000..03dabda --- /dev/null +++ b/brmbar3/schema/0010-shop-sell-for-cash.sql @@ -0,0 +1,141 @@ +-- +-- 0009-shop-sell.sql +-- +-- #10 - stored function for cash sell transaction +-- +-- ISC License +-- +-- Copyright 2023-2025 Brmlab, z.s. +-- TMA +-- +-- Permission to use, copy, modify, and/or distribute this software +-- for any purpose with or without fee is hereby granted, provided +-- that the above copyright notice and this permission notice appear +-- in all copies. +-- +-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL +-- WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED +-- WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE +-- AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR +-- CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS +-- OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, +-- NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN +-- CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +-- + +-- To require fully-qualified names +SELECT pg_catalog.set_config('search_path', '', false); + +DO $upgrade_block$ +BEGIN + +IF brmbar_privileged.has_exact_schema_version(9) THEN + +CREATE OR REPLACE FUNCTION brmbar_privileged.create_transaction( + i_responsible_id public.accounts.id%TYPE, + i_description public.transactions.description%TYPE +) RETURNS public.transactions.id%TYPE AS $$ +DECLARE + new_transaction_id public.transactions%TYPE; +BEGIN + -- Create a new transaction + INSERT INTO public.transactions (responsible, description) + VALUES (i_responsible_id, i_description) + RETURNING id INTO new_transaction_id; + -- Return the new transaction ID + RETURN new_transaction_id; +END; +$$ LANGUAGE plpgsql; + +CREATE OR REPLACE FUNCTION brmbar_privileged.sell_item_internal( + i_item_id public.accounts.id%TYPE, + i_amount INTEGER, + i_user_id public.accounts.id%TYPE, + i_target_currency_id public.currencies.id%TYPE, + i_other_memo TEXT, + i_description TEXT +) RETURNS NUMERIC +LANGUAGE plpgsql +AS $$ +DECLARE + v_buy_rate NUMERIC; + v_sell_rate NUMERIC; + v_cost NUMERIC; + v_profit NUMERIC; + v_transaction_id public.transactions.id%TYPE; +BEGIN + -- Get the buy and sell rates from the stored functions + v_buy_rate := public.find_buy_rate(i_item_id, i_target_currency_id); + v_sell_rate := public.find_sell_rate(i_item_id, i_target_currency_id); + + -- Calculate cost and profit + v_cost := i_amount * v_sell_rate; + v_profit := i_amount * (v_sell_rate - v_buy_rate); + + -- Create a new transaction + v_transaction_id := brmbar_privileged.create_transaction(i_user_id, i_description); + + -- the item (decrease stock) + INSERT INTO public.transaction_splits (transaction, side, account, amount, memo) + VALUES (i_transaction_id, 'credit', i_item_id, i_amount, + i_other_memo); + + -- the user + INSERT INTO public.transaction_splits (transaction, side, account, amount, memo) + VALUES (i_transaction_id, 'debit', i_user_id, v_cost, + (SELECT "name" FROM public.accounts WHERE id = i_item_id)); + + -- the profit + INSERT INTO public.transaction_splits (transaction, side, account, amount, memo) + VALUES (i_transaction_id, 'debit', (SELECT account_id FROM accounts WHERE name = 'BrmBar Profits'), v_profit, (SELECT 'Margin on ' || "name" FROM public.accounts WHERE id = i_item_id)); + + -- Return the cost + RETURN v_cost; +END; +$$; + +CREATE OR REPLACE FUNCTION public.sell_item( + i_item_id public.accounts.id%TYPE, + i_amount INTEGER, + i_user_id public.accounts.id%TYPE, + i_target_currency_id public.currencies.id%TYPE, + i_description TEXT +) RETURNS NUMERIC +LANGUAGE plpgsql +AS $$ +BEGIN + RETURN brmbar_privileged.sell_item_internal(i_item_id, + i_amount, + i_other_id, + i_target_currency_id, + (SELECT "name" FROM public.accounts WHERE id = i_user_id), + i_description); +END; +$$; + +CREATE OR REPLACE FUNCTION public.sell_item_for_cash( + i_item_id public.accounts.id%TYPE, + i_amount INTEGER, + i_user_id public.accounts.id%TYPE, + i_target_currency_id public.currencies.id%TYPE, + i_description TEXT +) RETURNS NUMERIC +LANGUAGE plpgsql +AS $$ +BEGIN + RETURN brmbar_privileged.sell_item_internal(i_item_id, + i_amount, + i_other_id, + i_target_currency_id, + 'Cash', + i_description); +END; +$$; + +PERFORM brmbar_privileged.upgrade_schema_version_to(10); +END IF; + +END; +$upgrade_block$; + +-- vim: set ft=plsql :