From 5b63e54687eab34d3e3978382dce410e6d0dc023 Mon Sep 17 00:00:00 2001
From: Petr Baudis <pasky@ucw.cz>
Date: Wed, 5 Sep 2012 13:47:31 +0200
Subject: [PATCH] brmbar v3: Properly record payment by cash in database

---
 brmbar3/brmbar-gui-qt4.py           |  4 ++++
 brmbar3/brmbar-gui-qt4/ItemInfo.qml |  2 +-
 brmbar3/brmbar/Shop.py              | 19 +++++++++++++++++--
 3 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/brmbar3/brmbar-gui-qt4.py b/brmbar3/brmbar-gui-qt4.py
index 3f53876..65bf9a7 100755
--- a/brmbar3/brmbar-gui-qt4.py
+++ b/brmbar3/brmbar-gui-qt4.py
@@ -51,6 +51,10 @@ class ShopAdapter(QtCore.QObject):
 		shop.sell(item = brmbar.Account.load(db, id = itemid), user = user)
 		return user.negbalance_str()
 
+	@QtCore.Slot('QVariant', result='QVariant')
+	def sellItemCash(self, itemid):
+		shop.sell_for_cash(item = brmbar.Account.load(db, id = itemid))
+
 	@QtCore.Slot('QVariant', 'QVariant', result='QVariant')
 	def chargeCredit(self, credit, userid):
 		user = brmbar.Account.load(db, id = userid)
diff --git a/brmbar3/brmbar-gui-qt4/ItemInfo.qml b/brmbar3/brmbar-gui-qt4/ItemInfo.qml
index 3445e7d..5f13ed3 100644
--- a/brmbar3/brmbar-gui-qt4/ItemInfo.qml
+++ b/brmbar3/brmbar-gui-qt4/ItemInfo.qml
@@ -70,7 +70,7 @@ Item {
         text: "Pay by cash"
         fontSize: 44
         onButtonClick: {
-            // TODO
+            shop.sellItemCash(dbid)
             status_text.setStatus("Sold! Put " + price + " Kč in the money box.", "#ffff7c")
             loadPage("MainPage")
         }
diff --git a/brmbar3/brmbar/Shop.py b/brmbar3/brmbar/Shop.py
index 422e118..fe2e9da 100644
--- a/brmbar3/brmbar/Shop.py
+++ b/brmbar3/brmbar/Shop.py
@@ -37,14 +37,29 @@ 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)
+
+		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 add_credit(self, credit, user):
 		transaction = self._transaction(responsible = user, description = "BrmBar credit replenishment for " + user.name)
 		self.cash.debit(transaction, credit, user.name)
 		user.credit(transaction, credit, "Credit replenishment")
 		self.db.commit()
 
-	def _transaction(self, responsible, description):
+	def _transaction(self, responsible = None, description = None):
 		with closing(self.db.cursor()) as cur:
-			cur.execute("INSERT INTO transactions (responsible, description) VALUES (%s, %s) RETURNING id", [responsible.id, description])
+			cur.execute("INSERT INTO transactions (responsible, description) VALUES (%s, %s) RETURNING id",
+					[responsible.id if responsible else None, description])
 			transaction = cur.fetchone()[0]
 		return transaction