Merge pull request 'bugfix/rounding-taxes' (#10) from bugfix/rounding-taxes into main

Reviewed-on: Vereins-IT/ez-lan-manager#10
Reviewed-by: David Rodenkirchen <typhus@ezgg-ev.de>

config/config.example.toml

@@ -28,14 +28,14 @@
 [tickets]
     [tickets."NORMAL"]
         total_tickets=30
-        price=2500
+        price="25.00"
         description="Normales Ticket"
         additional_info="Berechtigt zur Nutzung eines regulären Platzes für die gesamte Dauer der LAN"
         is_default=true
 
     [tickets."LUXUS"]
         total_tickets=10
-        price=3500
+        price="35.00"
         description="Luxus Ticket"
         additional_info="Berechtigt zur Nutzung eines verbesserten Platzes. Dieser ist mit einer höheren Internet-Bandbreite und einem Sitzkissen ausgestattet."
         is_default=false

sql/create_database.sql

@@ -28,7 +28,7 @@ CREATE TABLE `catering_menu_items` (
   `catering_menu_item_id` int(11) NOT NULL AUTO_INCREMENT,
   `name` varchar(45) NOT NULL,
   `additional_info` varchar(300) DEFAULT '',
-  `price` int(11) NOT NULL DEFAULT 0,
+  `price` varchar(45) NOT NULL DEFAULT '0',
   `category` varchar(80) NOT NULL,
   `is_disabled` tinyint(4) DEFAULT 0,
   PRIMARY KEY (`catering_menu_item_id`)

src/ez_lan_manager/components/CateringCartItem.py

@@ -1,4 +1,5 @@
 from typing import Callable
+from decimal import Decimal
 
 import rio
 from rio import Component, Row, Text, IconButton, TextStyle
@@ -9,7 +10,7 @@ MAX_LEN = 24
 
 class CateringCartItem(Component):
     article_name: str
-    article_price: int
+    article_price: Decimal
     article_id: int
     list_id: int
     remove_item_cb: Callable
@@ -24,7 +25,7 @@ class CateringCartItem(Component):
     def build(self) -> rio.Component:
         return Row(
             Text(self.ellipsize_string(self.article_name), align_x=0, overflow="wrap", min_width=19, style=TextStyle(fill=self.session.theme.background_color, font_size=0.9)),
-            Text(AccountingService.make_euro_string_from_int(self.article_price), style=TextStyle(fill=self.session.theme.background_color, font_size=0.9)),
+            Text(AccountingService.make_euro_string_from_decimal(self.article_price), style=TextStyle(fill=self.session.theme.background_color, font_size=0.9)),
             IconButton(icon="material/close", min_size=2, color=self.session.theme.danger_color, style="plain-text", on_press=lambda: self.remove_item_cb(self.list_id)),
             proportions=(19, 5, 2)
         )

src/ez_lan_manager/components/CateringSelectionItem.py

@@ -1,3 +1,4 @@
+from decimal import Decimal
 from typing import Callable
 
 import rio
@@ -7,9 +8,10 @@ from src.ez_lan_manager import AccountingService
 
 MAX_LEN = 24
 
+
 class CateringSelectionItem(Component):
     article_name: str
-    article_price: int
+    article_price: Decimal
     article_id: int
     on_add_callback: Callable
     is_sensitive: bool
@@ -33,15 +35,16 @@ class CateringSelectionItem(Component):
 
         return top.strip(), bottom.strip()
 
-
     def build(self) -> rio.Component:
         article_name_top, article_name_bottom = self.split_article_name(self.article_name)
 
         return Card(
             content=Column(
                 Row(
-                    Text(article_name_top, align_x=0, overflow="wrap", min_width=19, style=TextStyle(fill=self.session.theme.background_color, font_size=0.9)),
-                    Text(AccountingService.make_euro_string_from_int(self.article_price), style=TextStyle(fill=self.session.theme.background_color, font_size=0.9)),
+                    Text(article_name_top, align_x=0, overflow="wrap", min_width=19,
+                         style=TextStyle(fill=self.session.theme.background_color, font_size=0.9)),
+                    Text(AccountingService.make_euro_string_from_decimal(self.article_price),
+                         style=TextStyle(fill=self.session.theme.background_color, font_size=0.9)),
                     IconButton(
                         icon="material/add",
                         min_size=2,
@@ -53,7 +56,10 @@ class CateringSelectionItem(Component):
                     proportions=(19, 5, 2),
                     margin_bottom=0
                 ),
-                Spacer() if not article_name_bottom else Text(article_name_bottom, align_x=0, overflow="wrap", min_width=19, style=TextStyle(fill=self.session.theme.background_color, font_size=0.9)),
+                Spacer() if not article_name_bottom else Text(article_name_bottom, align_x=0, overflow="wrap",
+                                                              min_width=19,
+                                                              style=TextStyle(fill=self.session.theme.background_color,
+                                                                              font_size=0.9)),
                 Row(
                     Text(
                         self.additional_info,

src/ez_lan_manager/components/NewTransactionForm.py

@@ -1,4 +1,5 @@
 from datetime import datetime
+from decimal import Decimal
 from typing import Optional
 
 from rio import Component, Column, NumberInput, ThemeContextSwitcher, TextInput, Row, Button, EventHandler
@@ -18,7 +19,7 @@ class NewTransactionForm(Component):
             self.new_transaction_cb,
             Transaction(
                 user_id=self.user.user_id,
-                value=round(self.input_value * 100),
+                value=Decimal(str(self.input_value)),
                 is_debit=True,
                 reference=self.input_reason,
                 transaction_date=datetime.now()
@@ -30,7 +31,7 @@ class NewTransactionForm(Component):
             self.new_transaction_cb,
             Transaction(
                 user_id=self.user.user_id,
-                value=round(self.input_value * 100),
+                value=Decimal(str(self.input_value)),
                 is_debit=False,
                 reference=self.input_reason,
                 transaction_date=datetime.now()

src/ez_lan_manager/components/SeatingPlanInfoBox.py

@@ -1,3 +1,4 @@
+from decimal import Decimal
 from typing import Optional, Callable
 
 from rio import Component, Column, Text, TextStyle, Button, Spacer
@@ -9,23 +10,30 @@ class SeatingPlanInfoBox(Component):
     is_booking_blocked: bool
     seat_id: Optional[str] = None
     seat_occupant: Optional[str] = None
-    seat_price: int = 0
+    seat_price: Decimal = Decimal("0")
     is_blocked: bool = False
 
-
     def build(self) -> Component:
         if not self.show:
             return Spacer()
         if self.is_blocked:
-            return Column(Text(f"Sitzplatz gesperrt", margin=1, style=TextStyle(fill=self.session.theme.neutral_color, font_size=1.4), overflow="wrap", justify="center"), min_height=10)
+            return Column(Text(f"Sitzplatz gesperrt", margin=1,
+                               style=TextStyle(fill=self.session.theme.neutral_color, font_size=1.4), overflow="wrap",
+                               justify="center"), min_height=10)
         if self.seat_id is None and self.seat_occupant is None:
-            return Column(Text(f"Sitzplatz auswählen...", margin=1, style=TextStyle(fill=self.session.theme.neutral_color), overflow="wrap", justify="center"), min_height=10)
+            return Column(
+                Text(f"Sitzplatz auswählen...", margin=1, style=TextStyle(fill=self.session.theme.neutral_color),
+                     overflow="wrap", justify="center"), min_height=10)
         return Column(
-            Text(f"Dieser Sitzplatz ({self.seat_id}) ist gebucht von:", margin=1, style=TextStyle(fill=self.session.theme.neutral_color), overflow="wrap", justify="center"),
-            Text(f"{self.seat_occupant}", margin_bottom=1, style=TextStyle(fill=self.session.theme.neutral_color, font_size=1.4), overflow="wrap", justify="center"),
+            Text(f"Dieser Sitzplatz ({self.seat_id}) ist gebucht von:", margin=1,
+                 style=TextStyle(fill=self.session.theme.neutral_color), overflow="wrap", justify="center"),
+            Text(f"{self.seat_occupant}", margin_bottom=1,
+                 style=TextStyle(fill=self.session.theme.neutral_color, font_size=1.4), overflow="wrap",
+                 justify="center"),
             min_height=10
         ) if self.seat_id and self.seat_occupant else Column(
-            Text(f"Dieser Sitzplatz ({self.seat_id}) ist frei", margin=1, style=TextStyle(fill=self.session.theme.neutral_color), overflow="wrap", justify="center"),
+            Text(f"Dieser Sitzplatz ({self.seat_id}) ist frei", margin=1,
+                 style=TextStyle(fill=self.session.theme.neutral_color), overflow="wrap", justify="center"),
             Button(
                 Text(
                     f"Buchen",

src/ez_lan_manager/components/ShoppingCartAndOrders.py

@@ -1,4 +1,5 @@
 from asyncio import sleep, create_task
+from decimal import Decimal
 
 import rio
 from rio import Component, Column, Text, TextStyle, Button, Row, ScrollContainer, Spacer, Popup, Table
@@ -96,7 +97,7 @@ class ShoppingCartAndOrders(Component):
                         {
                             "Artikel": [item.name for item in order.items.keys()] + ["Gesamtpreis:"],
                             "Anzahl": [item for item in order.items.values()] + [""],
-                            "Preis": [AccountingService.make_euro_string_from_int(item.price) for item in order.items.keys()] + [AccountingService.make_euro_string_from_int(order.price)],
+                            "Preis": [AccountingService.make_euro_string_from_decimal(item.price) for item in order.items.keys()] + [AccountingService.make_euro_string_from_decimal(order.price)],
                         },
                         show_row_numbers=False
                     )
@@ -158,7 +159,7 @@ class ShoppingCartAndOrders(Component):
                     ),
                     Row(
                         Text(
-                            text=f"Preis: {AccountingService.make_euro_string_from_int(sum(cart_item.price for cart_item in cart))}",
+                            text=f"Preis: {AccountingService.make_euro_string_from_decimal(sum((cart_item.price for cart_item in cart), Decimal(0)))}",
                             style=TextStyle(
                                 fill=self.session.theme.background_color,
                                 font_size=0.8

src/ez_lan_manager/components/TicketBuyCard.py

@@ -1,5 +1,6 @@
 from functools import partial
 from typing import Callable, Optional
+from decimal import Decimal
 
 import rio
 from rio import Component, Card, Column, Text, Row, Button, TextStyle, ProgressBar, event, Spacer
@@ -12,7 +13,7 @@ from src.ez_lan_manager.types.Ticket import Ticket
 class TicketBuyCard(Component):
     description: str
     additional_info: str
-    price: int
+    price: Decimal
     category: str
     pressed_cb: Callable
     is_enabled: bool
@@ -67,7 +68,7 @@ class TicketBuyCard(Component):
                     margin_right=1
                 ),
                 Row(
-                    Text(f"{AccountingService.make_euro_string_from_int(self.price)}", margin_left=1, margin_top=1, grow_x=True),
+                    Text(f"{AccountingService.make_euro_string_from_decimal(self.price)}", margin_left=1, margin_top=1, grow_x=True),
                     Button(
                         Text("Kaufen", align_x=0.5, margin=0.4),
                         margin_right=1,

src/ez_lan_manager/components/UserInfoBox.py

@@ -1,5 +1,6 @@
 from random import choice
 from typing import Optional
+from decimal import Decimal
 
 from rio import Component, TextStyle, Color, Button, Text, Rectangle, Column, Row, Spacer, Link, event, EventHandler
 
@@ -23,26 +24,27 @@ class StatusButton(Component):
 
     def build(self) -> Component:
         return Link(
-                content=Button(
-                    content=Text(self.label, style=self.STYLE, justify="center"),
-                    shape="rectangle",
-                    style="major",
-                    color="success" if self.enabled else "danger",
-                    grow_x=True,
-                    margin_left=0.6,
-                    margin_right=0.6,
-                    margin_top=0.6
+            content=Button(
+                content=Text(self.label, style=self.STYLE, justify="center"),
+                shape="rectangle",
+                style="major",
+                color="success" if self.enabled else "danger",
+                grow_x=True,
+                margin_left=0.6,
+                margin_right=0.6,
+                margin_top=0.6
             ),
             target_url=self.target_url,
             align_y=0.5,
             grow_y=False
         )
 
+
 class UserInfoBox(Component):
     status_change_cb: EventHandler = None
     TEXT_STYLE = TextStyle(fill=Color.from_hex("02dac5"), font_size=0.9)
     user: Optional[User] = None
-    user_balance: Optional[int] = 0
+    user_balance: Optional[Decimal] = Decimal("0")
     user_ticket: Optional[Ticket] = None
     user_seat: Optional[Seat] = None
 
@@ -80,8 +82,10 @@ class UserInfoBox(Component):
             return Spacer()
         return Rectangle(
             content=Column(
-                Text(f"{self.get_greeting()},", style=TextStyle(fill=Color.from_hex("02dac5"), font_size=0.9), justify="center"),
-                Text(f"{self.user.user_name}", style=TextStyle(fill=Color.from_hex("02dac5"), font_size=1.2), justify="center"),
+                Text(f"{self.get_greeting()},", style=TextStyle(fill=Color.from_hex("02dac5"), font_size=0.9),
+                     justify="center"),
+                Text(f"{self.user.user_name}", style=TextStyle(fill=Color.from_hex("02dac5"), font_size=1.2),
+                     justify="center"),
                 Row(
                     StatusButton(label="TICKET", target_url="./buy_ticket",
                                  enabled=self.user_ticket is not None),
@@ -91,7 +95,9 @@ class UserInfoBox(Component):
                     grow_y=False
                 ),
                 UserInfoBoxButton("Profil bearbeiten", "./edit-profile"),
-                UserInfoBoxButton(f"Guthaben: {self.session[AccountingService].make_euro_string_from_int(self.user_balance)}", "./account"),
+                UserInfoBoxButton(
+                    f"Guthaben: {self.session[AccountingService].make_euro_string_from_decimal(self.user_balance)}",
+                    "./account"),
                 Button(
                     content=Text("Ausloggen", style=TextStyle(fill=Color.from_hex("02dac5"), font_size=0.6)),
                     shape="rectangle",

src/ez_lan_manager/helpers/create_demo_database_content.py

@@ -1,6 +1,7 @@
 # USE THIS ON AN EMPTY DATABASE TO GENERATE DEMO DATA
 import asyncio
 from datetime import date
+from decimal import Decimal
 
 import sys
 
@@ -9,13 +10,14 @@ from src.ez_lan_manager.types.CateringMenuItem import CateringMenuItemCategory
 from src.ez_lan_manager.types.News import News
 
 DEMO_USERS = [
-    { "user_name": "manfred", "user_mail": "manfred@demomail.com", "password_clear_text": "manfred" },  # Gast
-    { "user_name": "gustav", "user_mail": "gustav@demomail.com", "password_clear_text": "gustav" },     # Gast + Ticket(NORMAL)
-    { "user_name": "jason", "user_mail": "juergen@demomail.com", "password_clear_text": "jason" },      # Gast + Ticket(NORMAL) + Sitzplatz
-    { "user_name": "lisa", "user_mail": "lisa@demomail.com", "password_clear_text": "lisa" },           # Teamler
-    { "user_name": "thomas", "user_mail": "thomas@demomail.com", "password_clear_text": "thomas" }      # Teamler + Admin
+    {"user_name": "manfred", "user_mail": "manfred@demomail.com", "password_clear_text": "manfred"},  # Gast
+    {"user_name": "gustav", "user_mail": "gustav@demomail.com", "password_clear_text": "gustav"},  # Gast + Ticket(NORMAL)
+    {"user_name": "jason", "user_mail": "juergen@demomail.com", "password_clear_text": "jason"},  # Gast + Ticket(NORMAL) + Sitzplatz
+    {"user_name": "lisa", "user_mail": "lisa@demomail.com", "password_clear_text": "lisa"},  # Teamler
+    {"user_name": "thomas", "user_mail": "thomas@demomail.com", "password_clear_text": "thomas"}  # Teamler + Admin
 ]
 
+
 async def run() -> None:
     services = init_services()
     await services[3].init_db_pool()
@@ -31,112 +33,143 @@ async def run() -> None:
 
     if not input("Generate users? (Y/n): ").lower() == "n":
         # MANFRED
-        manfred = await user_service.create_user(DEMO_USERS[0]["user_name"], DEMO_USERS[0]["user_mail"], DEMO_USERS[0]["password_clear_text"])
+        manfred = await user_service.create_user(DEMO_USERS[0]["user_name"], DEMO_USERS[0]["user_mail"],
+                                                 DEMO_USERS[0]["password_clear_text"])
 
         # GUSTAV
-        gustav = await user_service.create_user(DEMO_USERS[1]["user_name"], DEMO_USERS[1]["user_mail"], DEMO_USERS[1]["password_clear_text"])
-        await accounting_service.add_balance(gustav.user_id, 100000, "DEMO EINZAHLUNG")
+        gustav = await user_service.create_user(DEMO_USERS[1]["user_name"], DEMO_USERS[1]["user_mail"],
+                                                DEMO_USERS[1]["password_clear_text"])
+        await accounting_service.add_balance(gustav.user_id, Decimal("1000.00"), "DEMO EINZAHLUNG")
         await ticket_service.purchase_ticket(gustav.user_id, "NORMAL")
 
         # JASON
-        jason = await user_service.create_user(DEMO_USERS[2]["user_name"], DEMO_USERS[2]["user_mail"], DEMO_USERS[2]["password_clear_text"])
-        await accounting_service.add_balance(jason.user_id, 100000, "DEMO EINZAHLUNG")
+        jason = await user_service.create_user(DEMO_USERS[2]["user_name"], DEMO_USERS[2]["user_mail"],
+                                               DEMO_USERS[2]["password_clear_text"])
+        await accounting_service.add_balance(jason.user_id, Decimal("1000.00"), "DEMO EINZAHLUNG")
         await ticket_service.purchase_ticket(jason.user_id, "NORMAL")
-        await seating_service.seat_user(jason.user_id, "D10")
 
         # LISA
-        lisa = await user_service.create_user(DEMO_USERS[3]["user_name"], DEMO_USERS[3]["user_mail"], DEMO_USERS[3]["password_clear_text"])
-        await accounting_service.add_balance(lisa.user_id, 100000, "DEMO EINZAHLUNG")
+        lisa = await user_service.create_user(DEMO_USERS[3]["user_name"], DEMO_USERS[3]["user_mail"],
+                                              DEMO_USERS[3]["password_clear_text"])
+        await accounting_service.add_balance(lisa.user_id, Decimal("1000.00"), "DEMO EINZAHLUNG")
         lisa.is_team_member = True
         await user_service.update_user(lisa)
 
         # THOMAS
-        thomas = await user_service.create_user(DEMO_USERS[4]["user_name"], DEMO_USERS[4]["user_mail"], DEMO_USERS[4]["password_clear_text"])
-        await accounting_service.add_balance(thomas.user_id, 100000, "DEMO EINZAHLUNG")
+        thomas = await user_service.create_user(DEMO_USERS[4]["user_name"], DEMO_USERS[4]["user_mail"],
+                                                DEMO_USERS[4]["password_clear_text"])
+        await accounting_service.add_balance(thomas.user_id, Decimal("1000.00"), "DEMO EINZAHLUNG")
         thomas.is_team_member = True
         thomas.is_admin = True
         await user_service.update_user(thomas)
 
     if not input("Generate catering menu? (Y/n): ").lower() == "n":
         # MAIN_COURSE
-        await catering_service.add_menu_item("Schnitzel Wiener Art", "mit Pommes", 1050, CateringMenuItemCategory.MAIN_COURSE)
-        await catering_service.add_menu_item("Jäger Schnitzel mit Champignonrahm Sauce", "mit Pommes", 1150, CateringMenuItemCategory.MAIN_COURSE)
-        await catering_service.add_menu_item("Tortellini in Käsesauce mit Fleischfüllung", "", 1050, CateringMenuItemCategory.MAIN_COURSE)
-        await catering_service.add_menu_item("Tortellini in Käsesauce ohne Fleischfüllung", "Vegetarisch", 1050, CateringMenuItemCategory.MAIN_COURSE)
+        await catering_service.add_menu_item("Schnitzel Wiener Art", "mit Pommes", Decimal("10.00"),
+                                             CateringMenuItemCategory.MAIN_COURSE)
+        await catering_service.add_menu_item("Jäger Schnitzel mit Champignonrahm Sauce", "mit Pommes", Decimal("11.50"),
+                                             CateringMenuItemCategory.MAIN_COURSE)
+        await catering_service.add_menu_item("Tortellini in Käsesauce mit Fleischfüllung", "", Decimal("10.50"),
+                                             CateringMenuItemCategory.MAIN_COURSE)
+        await catering_service.add_menu_item("Tortellini in Käsesauce ohne Fleischfüllung", "Vegetarisch", Decimal("10.50"),
+                                             CateringMenuItemCategory.MAIN_COURSE)
 
         # SNACK
-        await catering_service.add_menu_item("Käse Schinken Wrap", "", 500, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Puten Paprika Wrap", "", 700, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Tomate Mozzarella Wrap", "", 600, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Portion Pommes", "", 400, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Rinds-Currywurst", "", 450, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Rinds-Currywurst mit Pommes", "", 650, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Nudelsalat", "", 450, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Nudelsalat mit Bockwurst", "", 600, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Kartoffelsalat", "", 450, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Kartoffelsalat mit Bockwurst", "", 600, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Sandwichtoast - Schinken", "", 180, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Sandwichtoast - Käse", "", 180, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Sandwichtoast - Schinken/Käse", "", 210, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Sandwichtoast - Salami", "", 180, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Sandwichtoast - Salami/Käse", "", 210, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Chips - Western Style", "", 130, CateringMenuItemCategory.SNACK)
-        await catering_service.add_menu_item("Nachos - Salted", "", 130, CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Käse Schinken Wrap", "", Decimal("5.00"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Puten Paprika Wrap", "", Decimal("7.00"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Tomate Mozzarella Wrap", "", Decimal("6.00"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Portion Pommes", "", Decimal("4.00"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Rinds-Currywurst", "", Decimal("4.50"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Rinds-Currywurst mit Pommes", "", Decimal("6.50"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Nudelsalat", "", Decimal("4.50"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Nudelsalat mit Bockwurst", "", Decimal("6.00"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Kartoffelsalat", "", Decimal("4.50"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Kartoffelsalat mit Bockwurst", "", Decimal("6.00"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Sandwichtoast - Schinken", "", Decimal("1.80"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Sandwichtoast - Käse", "", Decimal("1.80"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Sandwichtoast - Schinken/Käse", "", Decimal("2.10"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Sandwichtoast - Salami", "", Decimal("1.80"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Sandwichtoast - Salami/Käse", "", Decimal("2.10"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Chips - Western Style", "", Decimal("1.30"), CateringMenuItemCategory.SNACK)
+        await catering_service.add_menu_item("Nachos - Salted", "", Decimal("1.30"), CateringMenuItemCategory.SNACK)
 
         # DESSERT
-        await catering_service.add_menu_item("Panna Cotta mit Erdbeersauce", "", 700, CateringMenuItemCategory.DESSERT)
-        await catering_service.add_menu_item("Panna Cotta mit Blaubeersauce", "", 700, CateringMenuItemCategory.DESSERT)
-        await catering_service.add_menu_item("Mousse au Chocolat", "", 700, CateringMenuItemCategory.DESSERT)
+        await catering_service.add_menu_item("Panna Cotta mit Erdbeersauce", "", Decimal("7.00"), CateringMenuItemCategory.DESSERT)
+        await catering_service.add_menu_item("Panna Cotta mit Blaubeersauce", "", Decimal("7.00"), CateringMenuItemCategory.DESSERT)
+        await catering_service.add_menu_item("Mousse au Chocolat", "", Decimal("7.00"), CateringMenuItemCategory.DESSERT)
 
         # BREAKFAST
-        await catering_service.add_menu_item("Fruit Loops", "", 150, CateringMenuItemCategory.BREAKFAST)
-        await catering_service.add_menu_item("Smacks", "", 150, CateringMenuItemCategory.BREAKFAST)
-        await catering_service.add_menu_item("Knuspermüsli", "Schoko", 200, CateringMenuItemCategory.BREAKFAST)
-        await catering_service.add_menu_item("Cini Minis", "", 150, CateringMenuItemCategory.BREAKFAST)
-        await catering_service.add_menu_item("Brötchen - Schinken", "mit Margarine", 120, CateringMenuItemCategory.BREAKFAST)
-        await catering_service.add_menu_item("Brötchen - Käse", "mit Margarine", 120, CateringMenuItemCategory.BREAKFAST)
-        await catering_service.add_menu_item("Brötchen - Schinken/Käse", "mit Margarine", 140, CateringMenuItemCategory.BREAKFAST)
-        await catering_service.add_menu_item("Brötchen - Salami", "mit Margarine", 120, CateringMenuItemCategory.BREAKFAST)
-        await catering_service.add_menu_item("Brötchen - Salami/Käse", "mit Margarine", 140, CateringMenuItemCategory.BREAKFAST)
-        await catering_service.add_menu_item("Brötchen - Nutella", "mit Margarine", 120, CateringMenuItemCategory.BREAKFAST)
+        await catering_service.add_menu_item("Fruit Loops", "", Decimal("1.50"), CateringMenuItemCategory.BREAKFAST)
+        await catering_service.add_menu_item("Smacks", "", Decimal("1.50"), CateringMenuItemCategory.BREAKFAST)
+        await catering_service.add_menu_item("Knuspermüsli", "Schoko", Decimal("2.00"), CateringMenuItemCategory.BREAKFAST)
+        await catering_service.add_menu_item("Cini Minis", "", Decimal("2.50"), CateringMenuItemCategory.BREAKFAST)
+        await catering_service.add_menu_item("Brötchen - Schinken", "mit Margarine", Decimal("1.20"),
+                                             CateringMenuItemCategory.BREAKFAST)
+        await catering_service.add_menu_item("Brötchen - Käse", "mit Margarine", Decimal("1.20"),
+                                             CateringMenuItemCategory.BREAKFAST)
+        await catering_service.add_menu_item("Brötchen - Schinken/Käse", "mit Margarine", Decimal("1.40"),
+                                             CateringMenuItemCategory.BREAKFAST)
+        await catering_service.add_menu_item("Brötchen - Salami", "mit Margarine", Decimal("1.20"),
+                                             CateringMenuItemCategory.BREAKFAST)
+        await catering_service.add_menu_item("Brötchen - Salami/Käse", "mit Margarine", Decimal("1.40"),
+                                             CateringMenuItemCategory.BREAKFAST)
+        await catering_service.add_menu_item("Brötchen - Nutella", "mit Margarine", Decimal("1.20"),
+                                             CateringMenuItemCategory.BREAKFAST)
 
         # BEVERAGE_NON_ALCOHOLIC
-        await catering_service.add_menu_item("Wasser - Still", "1L Flasche", 200, CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
-        await catering_service.add_menu_item("Wasser - Medium", "1L Flasche", 200, CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
-        await catering_service.add_menu_item("Wasser - Spritzig", "1L Flasche", 200, CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
-        await catering_service.add_menu_item("Coca-Cola", "1L Flasche", 200, CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
-        await catering_service.add_menu_item("Coca-Cola Zero", "1L Flasche", 200, CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
-        await catering_service.add_menu_item("Fanta", "1L Flasche", 200, CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
-        await catering_service.add_menu_item("Sprite", "1L Flasche", 200, CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
-        await catering_service.add_menu_item("Spezi", "von Paulaner, 0,5L Flasche", 150, CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
-        await catering_service.add_menu_item("Red Bull", "", 200, CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
-        await catering_service.add_menu_item("Energy", "Hausmarke", 150, CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
+        await catering_service.add_menu_item("Wasser - Still", "1L Flasche", Decimal("2.00"),
+                                             CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
+        await catering_service.add_menu_item("Wasser - Medium", "1L Flasche", Decimal("2.00"),
+                                             CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
+        await catering_service.add_menu_item("Wasser - Spritzig", "1L Flasche", Decimal("2.00"),
+                                             CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
+        await catering_service.add_menu_item("Coca-Cola", "1L Flasche", Decimal("2.00"),
+                                             CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
+        await catering_service.add_menu_item("Coca-Cola Zero", "1L Flasche", Decimal("2.00"),
+                                             CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
+        await catering_service.add_menu_item("Fanta", "1L Flasche", Decimal("2.00"),
+                                             CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
+        await catering_service.add_menu_item("Sprite", "1L Flasche", Decimal("2.00"),
+                                             CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
+        await catering_service.add_menu_item("Spezi", "von Paulaner, 0,5L Flasche", Decimal("1.50"),
+                                             CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
+        await catering_service.add_menu_item("Red Bull", "", Decimal("2.00"), CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
+        await catering_service.add_menu_item("Energy", "Hausmarke", Decimal("1.50"),
+                                             CateringMenuItemCategory.BEVERAGE_NON_ALCOHOLIC)
 
         # BEVERAGE_ALCOHOLIC
-        await catering_service.add_menu_item("Pils", "0,33L Flasche", 190, CateringMenuItemCategory.BEVERAGE_ALCOHOLIC)
-        await catering_service.add_menu_item("Radler", "0,33L Flasche", 190, CateringMenuItemCategory.BEVERAGE_ALCOHOLIC)
-        await catering_service.add_menu_item("Diesel", "0,33L Flasche", 190, CateringMenuItemCategory.BEVERAGE_ALCOHOLIC)
-        await catering_service.add_menu_item("Apfelwein Pur", "0,33L Flasche", 190, CateringMenuItemCategory.BEVERAGE_ALCOHOLIC)
-        await catering_service.add_menu_item("Apfelwein Sauer", "0,33L Flasche", 190, CateringMenuItemCategory.BEVERAGE_ALCOHOLIC)
-        await catering_service.add_menu_item("Apfelwein Cola", "0,33L Flasche", 190, CateringMenuItemCategory.BEVERAGE_ALCOHOLIC)
+        await catering_service.add_menu_item("Pils", "0,33L Flasche", Decimal("1.90"), CateringMenuItemCategory.BEVERAGE_ALCOHOLIC)
+        await catering_service.add_menu_item("Radler", "0,33L Flasche", Decimal("1.90"),
+                                             CateringMenuItemCategory.BEVERAGE_ALCOHOLIC)
+        await catering_service.add_menu_item("Diesel", "0,33L Flasche", Decimal("1.90"),
+                                             CateringMenuItemCategory.BEVERAGE_ALCOHOLIC)
+        await catering_service.add_menu_item("Apfelwein Pur", "0,33L Flasche", Decimal("1.90"),
+                                             CateringMenuItemCategory.BEVERAGE_ALCOHOLIC)
+        await catering_service.add_menu_item("Apfelwein Sauer", "0,33L Flasche", Decimal("1.90"),
+                                             CateringMenuItemCategory.BEVERAGE_ALCOHOLIC)
+        await catering_service.add_menu_item("Apfelwein Cola", "0,33L Flasche", Decimal("1.90"),
+                                             CateringMenuItemCategory.BEVERAGE_ALCOHOLIC)
 
         # BEVERAGE_COCKTAIL
-        await catering_service.add_menu_item("Vodka Energy", "", 400, CateringMenuItemCategory.BEVERAGE_COCKTAIL)
-        await catering_service.add_menu_item("Vodka O-Saft", "", 400, CateringMenuItemCategory.BEVERAGE_COCKTAIL)
-        await catering_service.add_menu_item("Whiskey Cola", "mit Bourbon", 400, CateringMenuItemCategory.BEVERAGE_COCKTAIL)
-        await catering_service.add_menu_item("Jägermeister Energy", "", 400, CateringMenuItemCategory.BEVERAGE_COCKTAIL)
-        await catering_service.add_menu_item("Sex on the Beach", "", 550, CateringMenuItemCategory.BEVERAGE_COCKTAIL)
-        await catering_service.add_menu_item("Long Island Ice Tea", "", 550, CateringMenuItemCategory.BEVERAGE_COCKTAIL)
-        await catering_service.add_menu_item("Caipirinha", "", 550, CateringMenuItemCategory.BEVERAGE_COCKTAIL)
+        await catering_service.add_menu_item("Vodka Energy", "", Decimal("4.00"), CateringMenuItemCategory.BEVERAGE_COCKTAIL)
+        await catering_service.add_menu_item("Vodka O-Saft", "", Decimal("4.00"), CateringMenuItemCategory.BEVERAGE_COCKTAIL)
+        await catering_service.add_menu_item("Whiskey Cola", "mit Bourbon", Decimal("4.00"),
+                                             CateringMenuItemCategory.BEVERAGE_COCKTAIL)
+        await catering_service.add_menu_item("Jägermeister Energy", "", Decimal("4.00"), CateringMenuItemCategory.BEVERAGE_COCKTAIL)
+        await catering_service.add_menu_item("Sex on the Beach", "", Decimal("5.50"), CateringMenuItemCategory.BEVERAGE_COCKTAIL)
+        await catering_service.add_menu_item("Long Island Ice Tea", "", Decimal("5.50"), CateringMenuItemCategory.BEVERAGE_COCKTAIL)
+        await catering_service.add_menu_item("Caipirinha", "", Decimal("5.50"), CateringMenuItemCategory.BEVERAGE_COCKTAIL)
 
         # BEVERAGE_SHOT
-        await catering_service.add_menu_item("Jägermeister", "", 200, CateringMenuItemCategory.BEVERAGE_SHOT)
-        await catering_service.add_menu_item("Tequila", "", 200, CateringMenuItemCategory.BEVERAGE_SHOT)
-        await catering_service.add_menu_item("PfEZzi", "Getunter Pfefferminz-Schnaps", 199, CateringMenuItemCategory.BEVERAGE_SHOT)
+        await catering_service.add_menu_item("Jägermeister", "", Decimal("2.00"), CateringMenuItemCategory.BEVERAGE_SHOT)
+        await catering_service.add_menu_item("Tequila", "", Decimal("2.00"), CateringMenuItemCategory.BEVERAGE_SHOT)
+        await catering_service.add_menu_item("PfEZzi", "Getunter Pfefferminz-Schnaps", Decimal("1.99"),
+                                             CateringMenuItemCategory.BEVERAGE_SHOT)
 
         # NON_FOOD
-        await catering_service.add_menu_item("Zigaretten", "Elixyr", 800, CateringMenuItemCategory.NON_FOOD)
-        await catering_service.add_menu_item("Mentholfilter", "passend für Elixyr", 120, CateringMenuItemCategory.NON_FOOD)
+        await catering_service.add_menu_item("Zigaretten", "Elixyr", Decimal("8.00"), CateringMenuItemCategory.NON_FOOD)
+        await catering_service.add_menu_item("Mentholfilter", "passend für Elixyr", Decimal("1.20"),
+                                             CateringMenuItemCategory.NON_FOOD)
 
     if not input("Generate default new post? (Y/n): ").lower() == "n":
         loops = 0
@@ -154,11 +187,14 @@ async def run() -> None:
             news_id=None,
             title="Der EZ LAN Manager",
             subtitle="Eine Software des EZ GG e.V.",
-            content="Dies ist eine WIP-Version des EZ LAN Managers. Diese Software soll uns helfen in Zukunft die LAN Parties des EZ GG e.V.'s zu organisieren. Wer Fehler findet darf sie behalten. (Oder er meldet sie)",
+            content="Dies ist eine WIP-Version des EZ LAN Managers. Diese Software soll uns helfen in Zukunft die LAN "
+                    "Parties des EZ GG e.V.'s zu organisieren. Wer Fehler findet darf sie behalten. (Oder er meldet "
+                    "sie)",
             author=user,
             news_date=date.today()
         ))
 
+
 if __name__ == "__main__":
     with asyncio.Runner() as loop:
         loop.run(run())

src/ez_lan_manager/pages/Account.py

@@ -159,7 +159,7 @@ class AccountPage(Component):
                         align_x=0
                     ),
                     Text(
-                        f"{'-' if transaction.is_debit else '+'}{AccountingService.make_euro_string_from_int(transaction.value)}",
+                        f"{'-' if transaction.is_debit else '+'}{AccountingService.make_euro_string_from_decimal(transaction.value)}",
                         style=TextStyle(
                             fill=self.session.theme.danger_color if transaction.is_debit else self.session.theme.success_color,
                             font_size=0.8
@@ -175,7 +175,7 @@ class AccountPage(Component):
         return Column(
             MainViewContentBox(
                 content=Text(
-                    f"Kontostand: {AccountingService.make_euro_string_from_int(self.balance)}",
+                    f"Kontostand: {AccountingService.make_euro_string_from_decimal(self.balance)}",
                     style=TextStyle(
                         fill=self.session.theme.background_color,
                         font_size=1.2

src/ez_lan_manager/pages/ManageCateringPage.py

@@ -13,6 +13,7 @@ from src.ez_lan_manager.types.Seat import Seat
 
 logger = logging.getLogger(__name__.split(".")[-1])
 
+
 class CateringOrderInfoPopup(Component):
     order: Optional[CateringOrder] = None
     close_cb: Optional[Callable] = None
@@ -20,17 +21,18 @@ class CateringOrderInfoPopup(Component):
     def build(self) -> Component:
         if not self.order:
             return Card(
-            content=Text(""),
-            margin=1,
-            color=self.session.theme.hud_color,
-            min_width=40,
-            min_height=40,
-            on_press=self.close_cb
-        )
+                content=Text(""),
+                margin=1,
+                color=self.session.theme.hud_color,
+                min_width=40,
+                min_height=40,
+                on_press=self.close_cb
+            )
         rows = []
         is_contrast_line = True
         for item, amount in self.order.items.items():
-            style = TextStyle(fill=self.session.theme.secondary_color if is_contrast_line else self.session.theme.neutral_color)
+            style = TextStyle(
+                fill=self.session.theme.secondary_color if is_contrast_line else self.session.theme.neutral_color)
             is_contrast_line = not is_contrast_line
             rows.append(
                 Row(
@@ -44,7 +46,8 @@ class CateringOrderInfoPopup(Component):
                 Text(f"Bestellung {self.order.order_id}", style=TextStyle(font_size=1.2), margin_bottom=1),
                 *rows,
                 Spacer(),
-                Row(Text("Gesamtpreis:"), Spacer(), Text(self.session[AccountingService].make_euro_string_from_int(self.order.price)))
+                Row(Text("Gesamtpreis:"), Spacer(),
+                    Text(self.session[AccountingService].make_euro_string_from_decimal(self.order.price)))
             ),
             margin=1,
             color=self.session.theme.hud_color,
@@ -56,11 +59,13 @@ class CateringOrderInfoPopup(Component):
             colorize_on_hover=False
         )
 
+
 @dataclass
 class CateringOrderWithSeat:
     catering_order: CateringOrder
     seat: Optional[Seat]
 
+
 class ManageCateringPage(Component):
     all_orders: list[CateringOrderWithSeat] = field(default_factory=list)
     last_updated: Optional[datetime] = None
@@ -73,7 +78,6 @@ class ManageCateringPage(Component):
         self.all_orders = await self.populate_seating(await self.session[CateringService].get_orders())
         self.last_updated = datetime.now()
 
-
     @event.periodic(30)
     async def update_orders(self) -> None:
         polled_orders = await self.session[CateringService].get_orders()
@@ -88,12 +92,16 @@ class ManageCateringPage(Component):
         return result
 
     def get_all_pending_orders(self) -> list[CateringOrderWithSeat]:
-        filtered_list = list(filter(lambda o: o.catering_order.status != CateringOrderStatus.COMPLETED and o.catering_order.status != CateringOrderStatus.CANCELED, self.all_orders))
+        filtered_list = list(filter(lambda
+                                        o: o.catering_order.status != CateringOrderStatus.COMPLETED and o.catering_order.status != CateringOrderStatus.CANCELED,
+                                    self.all_orders))
         sorted_list = sorted(filtered_list, key=lambda o: o.catering_order.order_date)
         return sorted_list
 
     def get_all_completed_orders(self) -> list[CateringOrderWithSeat]:
-        filtered_list = list(filter(lambda o: o.catering_order.status == CateringOrderStatus.COMPLETED or o.catering_order.status == CateringOrderStatus.CANCELED, self.all_orders))
+        filtered_list = list(filter(lambda
+                                        o: o.catering_order.status == CateringOrderStatus.COMPLETED or o.catering_order.status == CateringOrderStatus.CANCELED,
+                                    self.all_orders))
         sorted_list = sorted(filtered_list, key=lambda o: o.catering_order.order_date)
         return sorted_list
 
@@ -154,7 +162,8 @@ class ManageCateringPage(Component):
                         margin_bottom=1,
                         on_press=self.update_orders
                     ),
-                    *[CateringManagementOrderDisplay(v.catering_order, v.seat, self.order_clicked) for v in self.get_all_pending_orders()],
+                    *[CateringManagementOrderDisplay(v.catering_order, v.seat, self.order_clicked) for v in
+                      self.get_all_pending_orders()],
                 )
             ),
             MainViewContentBox(
@@ -169,7 +178,8 @@ class ManageCateringPage(Component):
                         margin_bottom=0.2,
                         align_x=0.5
                     ),
-                    *[CateringManagementOrderDisplay(v.catering_order, v.seat, self.order_clicked) for v in self.get_all_completed_orders()],
+                    *[CateringManagementOrderDisplay(v.catering_order, v.seat, self.order_clicked) for v in
+                      self.get_all_completed_orders()],
                 )
             ),
             Spacer()

src/ez_lan_manager/pages/ManageUsersPage.py

@@ -17,6 +17,7 @@ from src.ez_lan_manager.types.User import User
 
 logger = logging.getLogger(__name__.split(".")[-1])
 
+
 class ClickableGridContent(Component):
     text: str = ""
     is_hovered: bool = False
@@ -36,7 +37,8 @@ class ClickableGridContent(Component):
             content=Rectangle(
                 content=Text(
                     self.text,
-                    style=TextStyle(fill=self.session.theme.success_color) if self.is_hovered else TextStyle(fill=self.session.theme.background_color),
+                    style=TextStyle(fill=self.session.theme.success_color) if self.is_hovered else TextStyle(
+                        fill=self.session.theme.background_color),
                     grow_x=True
                 ),
                 fill=Color.TRANSPARENT,
@@ -47,6 +49,7 @@ class ClickableGridContent(Component):
             on_press=self.on_mouse_click
         )
 
+
 class ManageUsersPage(Component):
     selected_user: Optional[User] = None
     all_users: Optional[list] = None
@@ -66,13 +69,15 @@ class ManageUsersPage(Component):
     async def on_user_clicked(self, user_name: str) -> None:
         self.selected_user = next(filter(lambda user: user.user_name == user_name, self.all_users))
         user_account_balance_raw = await self.session[AccountingService].get_balance(self.selected_user.user_id)
-        self.user_account_balance = AccountingService.make_euro_string_from_int(user_account_balance_raw)
+        self.user_account_balance = AccountingService.make_euro_string_from_decimal(user_account_balance_raw)
         seat = await self.session[SeatingService].get_user_seat(self.selected_user.user_id)
         self.user_seat = seat.seat_id if seat else "-"
         self.is_user_account_locked = not self.selected_user.is_active
 
     async def on_search_parameters_changed(self, e: TextInputChangeEvent) -> None:
-        self.search_results = list(filter(lambda user: (e.text.lower() in user.user_name.lower()) or e.text.lower() in str(user.user_id), self.all_users))
+        self.search_results = list(
+            filter(lambda user: (e.text.lower() in user.user_name.lower()) or e.text.lower() in str(user.user_id),
+                   self.all_users))
 
     async def change_account_active(self, _: SwitchChangeEvent) -> None:
         self.selected_user.is_active = not self.is_user_account_locked
@@ -84,7 +89,7 @@ class ManageUsersPage(Component):
 
         logger.info(f"Got new transaction for user with ID '{transaction.user_id}' over "
                     f"{'-' if transaction.is_debit else '+'}"
-                    f"{AccountingService.make_euro_string_from_int(transaction.value)} "
+                    f"{AccountingService.make_euro_string_from_decimal(transaction.value)} "
                     f"with reference '{transaction.reference}'")
 
         if transaction.is_debit:
@@ -108,7 +113,6 @@ class ManageUsersPage(Component):
         self.accounting_section_result_text = f"Guthaben {'entfernt' if transaction.is_debit else 'hinzugefügt'}!"
         self.accounting_section_result_success = True
 
-
     def build(self) -> Component:
         return Column(
             MainViewContentBox(

src/ez_lan_manager/pages/SeatingPlanPage.py

@@ -1,5 +1,6 @@
 import logging
 from asyncio import sleep
+from decimal import Decimal
 from typing import Optional
 
 from rio import Text, Column, TextStyle, Component, event, PressEvent, ProgressCircle
@@ -21,7 +22,7 @@ class SeatingPlanPage(Component):
     seating_info: Optional[list[Seat]] = None
     current_seat_id: Optional[str] = None
     current_seat_occupant: Optional[str] = None
-    current_seat_price: int = 0
+    current_seat_price: Decimal = Decimal("0")
     current_seat_is_blocked: bool = False
     user: Optional[User] = None
     show_info_box: bool = True
@@ -54,7 +55,7 @@ class SeatingPlanPage(Component):
         self.current_seat_is_blocked = seat.is_blocked
         self.current_seat_id = seat.seat_id
         ticket_info = self.session[TicketingService].get_ticket_info_by_category(seat.category)
-        price = 0 if not ticket_info else ticket_info.price
+        price = Decimal("0") if not ticket_info else ticket_info.price
         self.current_seat_price = price
         if seat.user:
             self.current_seat_occupant = seat.user.user_name

src/ez_lan_manager/services/AccountingService.py

@@ -1,15 +1,18 @@
 import logging
 from collections.abc import Callable
 from datetime import datetime
+from decimal import Decimal, ROUND_DOWN
 
 from src.ez_lan_manager.services.DatabaseService import DatabaseService
 from src.ez_lan_manager.types.Transaction import Transaction
 
 logger = logging.getLogger(__name__.split(".")[-1])
 
+
 class InsufficientFundsError(Exception):
     pass
 
+
 class AccountingService:
     def __init__(self, db_service: DatabaseService) -> None:
         self._db_service = db_service
@@ -19,7 +22,7 @@ class AccountingService:
         """ Adds a function to this service, which is called whenever the account balance changes """
         self._update_hooks.add(update_hook)
 
-    async def add_balance(self, user_id: int, balance_to_add: int, reference: str) -> int:
+    async def add_balance(self, user_id: int, balance_to_add: Decimal, reference: str) -> Decimal:
         await self._db_service.add_transaction(Transaction(
             user_id=user_id,
             value=balance_to_add,
@@ -27,12 +30,12 @@ class AccountingService:
             reference=reference,
             transaction_date=datetime.now()
         ))
-        logger.debug(f"Added balance of {self.make_euro_string_from_int(balance_to_add)} to user with ID {user_id}")
+        logger.debug(f"Added balance of {self.make_euro_string_from_decimal(balance_to_add)} to user with ID {user_id}")
         for update_hook in self._update_hooks:
             await update_hook()
         return await self.get_balance(user_id)
 
-    async def remove_balance(self, user_id: int, balance_to_remove: int, reference: str) -> int:
+    async def remove_balance(self, user_id: int, balance_to_remove: Decimal, reference: str) -> Decimal:
         current_balance = await self.get_balance(user_id)
         if (current_balance - balance_to_remove) < 0:
             raise InsufficientFundsError
@@ -43,13 +46,14 @@ class AccountingService:
             reference=reference,
             transaction_date=datetime.now()
         ))
-        logger.debug(f"Removed balance of {self.make_euro_string_from_int(balance_to_remove)} to user with ID {user_id}")
+        logger.debug(
+            f"Removed balance of {self.make_euro_string_from_decimal(balance_to_remove)} to user with ID {user_id}")
         for update_hook in self._update_hooks:
             await update_hook()
         return await self.get_balance(user_id)
 
-    async def get_balance(self, user_id: int) -> int:
-        balance_buffer = 0
+    async def get_balance(self, user_id: int) -> Decimal:
+        balance_buffer = Decimal("0")
         for transaction in await self._db_service.get_all_transactions_for_user(user_id):
             if transaction.is_debit:
                 balance_buffer -= transaction.value
@@ -61,23 +65,9 @@ class AccountingService:
         return await self._db_service.get_all_transactions_for_user(user_id)
 
     @staticmethod
-    def make_euro_string_from_int(cent_int: int) -> str:
-        """ Internally, all money values are cents as ints. Only when showing them to the user we generate a string. Prevents float inaccuracy. """
-        as_str = str(cent_int)
-        if as_str[0] == "-":
-            is_negative = True
-            as_str = as_str[1:]
-        else:
-            is_negative = False
-
-        if len(as_str) == 1:
-            result = f"0.0{as_str} €"
-        elif len(as_str) == 2:
-            result = f"0.{as_str} €"
-        else:
-            result = f"{as_str[:-2]}.{as_str[-2:]} €"
-
-        if is_negative:
-            result = f"-{result}"
-
-        return result
+    def make_euro_string_from_decimal(euros: Decimal) -> str:
+        """
+        Internally, all money values are euros as decimal. Only when showing them to the user we generate a string.
+        """
+        rounded_decimal = str(euros.quantize(Decimal(".01"), rounding=ROUND_DOWN))
+        return f"{rounded_decimal} €"

src/ez_lan_manager/services/CateringService.py

@@ -1,4 +1,5 @@
 import logging
+from decimal import Decimal
 from enum import Enum
 from typing import Optional
 
@@ -10,11 +11,13 @@ from src.ez_lan_manager.types.CateringMenuItem import CateringMenuItem, Catering
 
 logger = logging.getLogger(__name__.split(".")[-1])
 
+
 class CateringErrorType(Enum):
     INCLUDES_DISABLED_ITEM = 0
     INSUFFICIENT_FUNDS = 1
     GENERIC = 99
 
+
 class CateringError(Exception):
     def __init__(self, message: str, error_type: CateringErrorType = CateringErrorType.GENERIC) -> None:
         self.message = message
@@ -30,7 +33,8 @@ class CateringService:
 
     # ORDERS
 
-    async def place_order(self, menu_items: CateringMenuItemsWithAmount, user_id: int, is_delivery: bool = True) -> CateringOrder:
+    async def place_order(self, menu_items: CateringMenuItemsWithAmount, user_id: int,
+                          is_delivery: bool = True) -> CateringOrder:
         for menu_item in menu_items:
             if menu_item.is_disabled:
                 raise CateringError("Order includes disabled items", CateringErrorType.INCLUDES_DISABLED_ITEM)
@@ -39,14 +43,15 @@ class CateringService:
         if not user:
             raise CateringError("User does not exist")
 
-        total_price = sum([item.price * quantity for item, quantity in menu_items.items()])
+        total_price = sum([item.price * quantity for item, quantity in menu_items.items()], Decimal(0))
         if await self._accounting_service.get_balance(user_id) < total_price:
             raise CateringError("Insufficient funds", CateringErrorType.INSUFFICIENT_FUNDS)
 
         order = await self._db_service.add_new_order(menu_items, user_id, is_delivery)
         if order:
             await self._accounting_service.remove_balance(user_id, total_price, f"CATERING - {order.order_id}")
-        logger.info(f"User '{order.customer.user_name}' (ID:{order.customer.user_id}) ordered from catering for {self._accounting_service.make_euro_string_from_int(total_price)}")
+        logger.info(
+            f"User '{order.customer.user_name}' (ID:{order.customer.user_id}) ordered from catering for {self._accounting_service.make_euro_string_from_decimal(total_price)}")
         # await self.cancel_order(order)  # ToDo: Check if commented out before commit. Un-comment to auto-cancel every placed order
         return order
 
@@ -68,7 +73,8 @@ class CateringService:
     async def cancel_order(self, order: CateringOrder) -> bool:
         change_result = await self._db_service.change_order_status(order.order_id, CateringOrderStatus.CANCELED)
         if change_result:
-            await self._accounting_service.add_balance(order.customer.user_id, order.price, f"CATERING REFUND - {order.order_id}")
+            await self._accounting_service.add_balance(order.customer.user_id, order.price,
+                                                       f"CATERING REFUND - {order.order_id}")
             return True
         return False
 
@@ -86,7 +92,8 @@ class CateringService:
             raise CateringError("Menu item not found")
         return item
 
-    async def add_menu_item(self, name: str, info: str, price: int, category: CateringMenuItemCategory, is_disabled: bool = False) -> CateringMenuItem:
+    async def add_menu_item(self, name: str, info: str, price: Decimal, category: CateringMenuItemCategory,
+                            is_disabled: bool = False) -> CateringMenuItem:
         if new_item := await self._db_service.add_menu_item(name, info, price, category, is_disabled):
             return new_item
         raise CateringError(f"Could not add item '{name}' to the menu.")
@@ -134,3 +141,4 @@ class CateringService:
             return self.cached_cart[user_id]
         except KeyError:
             return []
+

src/ez_lan_manager/services/ConfigurationService.py

@@ -1,15 +1,18 @@
 import sys
 from datetime import datetime
+from decimal import Decimal
 from pathlib import Path
 import logging
 import tomllib
 
 from from_root import from_root
 
-from src.ez_lan_manager.types.ConfigurationTypes import DatabaseConfiguration, MailingServiceConfiguration, LanInfo, SeatingConfiguration, TicketInfo
+from src.ez_lan_manager.types.ConfigurationTypes import DatabaseConfiguration, MailingServiceConfiguration, LanInfo, \
+    SeatingConfiguration, TicketInfo
 
 logger = logging.getLogger(__name__.split(".")[-1])
 
+
 class ConfigurationService:
     def __init__(self, config_file_path: Path) -> None:
         try:
@@ -40,7 +43,6 @@ class ConfigurationService:
             logger.fatal("Error loading DatabaseConfiguration, exiting...")
             sys.exit(1)
 
-
     def get_mailing_service_configuration(self) -> MailingServiceConfiguration:
         try:
             mailing_configuration = self._config["mailing"]
@@ -83,7 +85,7 @@ class ConfigurationService:
             return tuple([TicketInfo(
                 category=value,
                 total_tickets=self._config["tickets"][value]["total_tickets"],
-                price=self._config["tickets"][value]["price"],
+                price=Decimal(self._config["tickets"][value]["price"]),
                 description=self._config["tickets"][value]["description"],
                 additional_info=self._config["tickets"][value]["additional_info"],
                 is_default=self._config["tickets"][value]["is_default"]

src/ez_lan_manager/services/DatabaseService.py

@@ -2,6 +2,7 @@ import logging
 
 from datetime import date, datetime
 from typing import Optional
+from decimal import Decimal
 
 import aiomysql
 
@@ -17,14 +18,18 @@ from src.ez_lan_manager.types.User import User
 
 logger = logging.getLogger(__name__.split(".")[-1])
 
+
 class DuplicationError(Exception):
     pass
 
+
 class NoDatabaseConnectionError(Exception):
     pass
 
+
 class DatabaseService:
     MAX_CONNECTION_RETRIES = 5
+
     def __init__(self, database_config: DatabaseConfiguration) -> None:
         self._database_config = database_config
         self._connection_pool: Optional[aiomysql.Pool] = None
@@ -85,7 +90,6 @@ class DatabaseService:
                     return
                 return self._map_db_result_to_user(result)
 
-
     async def get_user_by_id(self, user_id: int) -> Optional[User]:
         async with self._connection_pool.acquire() as conn:
             async with conn.cursor(aiomysql.Cursor) as cursor:
@@ -110,7 +114,7 @@ class DatabaseService:
                 try:
                     await cursor.execute(
                         "INSERT INTO users (user_name, user_mail, user_password) "
-                                 "VALUES (%s, %s, %s)", (user_name, user_mail.lower(), password_hash)
+                        "VALUES (%s, %s, %s)", (user_name, user_mail.lower(), password_hash)
                     )
                     await conn.commit()
                 except aiomysql.InterfaceError:
@@ -123,19 +127,19 @@ class DatabaseService:
                     raise DuplicationError
 
         return await self.get_user_by_name(user_name)
-    
-    
 
     async def update_user(self, user: User) -> User:
         async with self._connection_pool.acquire() as conn:
             async with conn.cursor(aiomysql.Cursor) as cursor:
                 try:
                     await cursor.execute(
-                        "UPDATE users SET user_name=%s, user_mail=%s, user_password=%s, user_first_name=%s, user_last_name=%s, user_birth_date=%s, "
-                        "is_active=%s, is_team_member=%s, is_admin=%s WHERE (user_id=%s)", (user.user_name, user.user_mail.lower(), user.user_password,
-                                                                                                   user.user_first_name, user.user_last_name, user.user_birth_day,
-                                                                                                   user.is_active, user.is_team_member, user.is_admin,
-                                                                                                   user.user_id)
+                        "UPDATE users SET user_name=%s, user_mail=%s, user_password=%s, user_first_name=%s, "
+                        "user_last_name=%s, user_birth_date=%s, is_active=%s, is_team_member=%s, is_admin=%s "
+                        "WHERE (user_id=%s)",
+                        (user.user_name, user.user_mail.lower(), user.user_password,
+                         user.user_first_name, user.user_last_name, user.user_birth_day,
+                         user.is_active, user.is_team_member, user.is_admin,
+                         user.user_id)
                     )
                     await conn.commit()
                 except aiomysql.InterfaceError:
@@ -155,7 +159,8 @@ class DatabaseService:
                     await cursor.execute(
                         "INSERT INTO transactions (user_id, value, is_debit, transaction_date, transaction_reference) "
                         "VALUES (%s, %s, %s, %s, %s)",
-                        (transaction.user_id, transaction.value, transaction.is_debit, transaction.transaction_date, transaction.reference)
+                        (transaction.user_id, transaction.value, transaction.is_debit, transaction.transaction_date,
+                         transaction.reference)
                     )
                     await conn.commit()
                 except aiomysql.InterfaceError:
@@ -189,14 +194,13 @@ class DatabaseService:
                 for transaction_raw in result:
                     transactions.append(Transaction(
                         user_id=user_id,
-                        value=int(transaction_raw[2]),
+                        value=Decimal(transaction_raw[2]),
                         is_debit=bool(transaction_raw[3]),
                         transaction_date=transaction_raw[4],
                         reference=transaction_raw[5]
                     ))
                 return transactions
 
-
     async def add_news(self, news: News) -> None:
         async with self._connection_pool.acquire() as conn:
             async with conn.cursor(aiomysql.Cursor) as cursor:
@@ -215,13 +219,15 @@ class DatabaseService:
                 except Exception as e:
                     logger.warning(f"Error adding Transaction: {e}")
 
-
     async def get_news(self, dt_start: date, dt_end: date) -> list[News]:
         async with self._connection_pool.acquire() as conn:
             async with conn.cursor(aiomysql.Cursor) as cursor:
                 results = []
                 try:
-                    await cursor.execute("SELECT * FROM news INNER JOIN users ON news.news_author = users.user_id WHERE news_date BETWEEN %s AND %s;", (dt_start, dt_end))
+                    await cursor.execute(
+                        "SELECT * FROM news INNER JOIN users ON news.news_author = users.user_id WHERE news_date"
+                        " BETWEEN %s AND %s;",
+                        (dt_start, dt_end))
                     await conn.commit()
                 except aiomysql.InterfaceError:
                     pool_init_result = await self.init_db_pool()
@@ -315,12 +321,13 @@ class DatabaseService:
 
                 return results
 
-
     async def get_ticket_for_user(self, user_id: int) -> Optional[Ticket]:
         async with self._connection_pool.acquire() as conn:
             async with conn.cursor(aiomysql.Cursor) as cursor:
                 try:
-                    await cursor.execute("SELECT * FROM tickets INNER JOIN users ON tickets.user = users.user_id WHERE user_id=%s;", (user_id, ))
+                    await cursor.execute(
+                        "SELECT * FROM tickets INNER JOIN users ON tickets.user = users.user_id WHERE user_id=%s;",
+                        (user_id,))
                     await conn.commit()
                 except aiomysql.InterfaceError:
                     pool_init_result = await self.init_db_pool()
@@ -347,7 +354,8 @@ class DatabaseService:
         async with self._connection_pool.acquire() as conn:
             async with conn.cursor(aiomysql.Cursor) as cursor:
                 try:
-                    await cursor.execute("INSERT INTO tickets (ticket_category, user) VALUES (%s, %s)", (category, user_id))
+                    await cursor.execute("INSERT INTO tickets (ticket_category, user) VALUES (%s, %s)",
+                                         (category, user_id))
                     await conn.commit()
                 except aiomysql.InterfaceError:
                     pool_init_result = await self.init_db_pool()
@@ -360,12 +368,12 @@ class DatabaseService:
 
                 return await self.get_ticket_for_user(user_id)
 
-
     async def change_ticket_owner(self, ticket_id: int, new_owner_id: int) -> bool:
         async with self._connection_pool.acquire() as conn:
             async with conn.cursor(aiomysql.Cursor) as cursor:
                 try:
-                    await cursor.execute("UPDATE tickets SET user = %s WHERE ticket_id = %s;", (new_owner_id, ticket_id))
+                    await cursor.execute("UPDATE tickets SET user = %s WHERE ticket_id = %s;",
+                                         (new_owner_id, ticket_id))
                     affected_rows = cursor.rowcount
                     await conn.commit()
                 except aiomysql.InterfaceError:
@@ -382,7 +390,7 @@ class DatabaseService:
         async with self._connection_pool.acquire() as conn:
             async with conn.cursor(aiomysql.Cursor) as cursor:
                 try:
-                    await cursor.execute("DELETE FROM tickets WHERE ticket_id = %s;", (ticket_id, ))
+                    await cursor.execute("DELETE FROM tickets WHERE ticket_id = %s;", (ticket_id,))
                     await conn.commit()
                 except aiomysql.InterfaceError:
                     pool_init_result = await self.init_db_pool()
@@ -401,7 +409,8 @@ class DatabaseService:
                 try:
                     await cursor.execute("TRUNCATE seats;")
                     for seat in seats:
-                        await cursor.execute("INSERT INTO seats (seat_id, seat_category) VALUES (%s, %s);", (seat[0], seat[1]))
+                        await cursor.execute("INSERT INTO seats (seat_id, seat_category) VALUES (%s, %s);",
+                                             (seat[0], seat[1]))
                     await conn.commit()
                 except aiomysql.InterfaceError:
                     pool_init_result = await self.init_db_pool()
@@ -417,7 +426,8 @@ class DatabaseService:
             async with conn.cursor(aiomysql.Cursor) as cursor:
                 results = []
                 try:
-                    await cursor.execute("SELECT seats.*, users.* FROM seats LEFT JOIN users ON seats.user = users.user_id;")
+                    await cursor.execute(
+                        "SELECT seats.*, users.* FROM seats LEFT JOIN users ON seats.user = users.user_id;")
                     await conn.commit()
                 except aiomysql.InterfaceError:
                     pool_init_result = await self.init_db_pool()
@@ -475,7 +485,7 @@ class DatabaseService:
                         item_id=menu_item_raw[0],
                         name=menu_item_raw[1],
                         additional_info=menu_item_raw[2],
-                        price=menu_item_raw[3],
+                        price=Decimal(menu_item_raw[3]),
                         category=CateringMenuItemCategory(menu_item_raw[4]),
                         is_disabled=bool(menu_item_raw[5])
                     ))
@@ -486,7 +496,8 @@ class DatabaseService:
         async with self._connection_pool.acquire() as conn:
             async with conn.cursor(aiomysql.Cursor) as cursor:
                 try:
-                    await cursor.execute("SELECT * FROM catering_menu_items WHERE catering_menu_item_id = %s;", (menu_item_id, ))
+                    await cursor.execute("SELECT * FROM catering_menu_items WHERE catering_menu_item_id = %s;",
+                                         (menu_item_id,))
                     await conn.commit()
                 except aiomysql.InterfaceError:
                     pool_init_result = await self.init_db_pool()
@@ -501,20 +512,22 @@ class DatabaseService:
                 if raw_data is None:
                     return
                 return CateringMenuItem(
-                        item_id=raw_data[0],
-                        name=raw_data[1],
-                        additional_info=raw_data[2],
-                        price=raw_data[3],
-                        category=CateringMenuItemCategory(raw_data[4]),
-                        is_disabled=bool(raw_data[5])
-                    )
+                    item_id=raw_data[0],
+                    name=raw_data[1],
+                    additional_info=raw_data[2],
+                    price=Decimal(raw_data[3]),
+                    category=CateringMenuItemCategory(raw_data[4]),
+                    is_disabled=bool(raw_data[5])
+                )
 
-    async def add_menu_item(self, name: str, info: str, price: int, category: CateringMenuItemCategory, is_disabled: bool = False) -> Optional[CateringMenuItem]:
+    async def add_menu_item(self, name: str, info: str, price: Decimal, category: CateringMenuItemCategory,
+                            is_disabled: bool = False) -> Optional[CateringMenuItem]:
         async with self._connection_pool.acquire() as conn:
             async with conn.cursor(aiomysql.Cursor) as cursor:
                 try:
                     await cursor.execute(
-                        "INSERT INTO catering_menu_items (name, additional_info, price, category, is_disabled) VALUES (%s, %s, %s, %s, %s);",
+                        "INSERT INTO catering_menu_items (name, additional_info, price, category, is_disabled) VALUES "
+                        "(%s, %s, %s, %s, %s);",
                         (name, info, price, category.value, is_disabled)
                     )
                     await conn.commit()
@@ -540,7 +553,8 @@ class DatabaseService:
         async with self._connection_pool.acquire() as conn:
             async with conn.cursor(aiomysql.Cursor) as cursor:
                 try:
-                    await cursor.execute("DELETE FROM catering_menu_items WHERE catering_menu_item_id = %s;", (menu_item_id,))
+                    await cursor.execute("DELETE FROM catering_menu_items WHERE catering_menu_item_id = %s;",
+                                         (menu_item_id,))
                     await conn.commit()
                 except aiomysql.InterfaceError:
                     pool_init_result = await self.init_db_pool()
@@ -557,8 +571,10 @@ class DatabaseService:
             async with conn.cursor(aiomysql.Cursor) as cursor:
                 try:
                     await cursor.execute(
-                    "UPDATE catering_menu_items SET name = %s, additional_info = %s, price = %s, category = %s, is_disabled = %s WHERE catering_menu_item_id = %s;",
-                        (updated_item.name, updated_item.additional_info, updated_item.price, updated_item.category.value, updated_item.is_disabled, updated_item.item_id)
+                        "UPDATE catering_menu_items SET name = %s, additional_info = %s, price = %s, category = %s, "
+                        "is_disabled = %s WHERE catering_menu_item_id = %s;",
+                        (updated_item.name, updated_item.additional_info, updated_item.price,
+                         updated_item.category.value, updated_item.is_disabled, updated_item.item_id)
                     )
                     affected_rows = cursor.rowcount
                     await conn.commit()
@@ -584,7 +600,8 @@ class DatabaseService:
                     order_id = cursor.lastrowid
                     for menu_item, quantity in menu_items.items():
                         await cursor.execute(
-                            "INSERT INTO order_catering_menu_item (order_id, catering_menu_item_id, quantity) VALUES (%s, %s, %s);",
+                            "INSERT INTO order_catering_menu_item (order_id, catering_menu_item_id, quantity) VALUES "
+                            "(%s, %s, %s);",
                             (order_id, menu_item.item_id, quantity)
                         )
                     await conn.commit()
@@ -673,7 +690,7 @@ class DatabaseService:
                         "SELECT * FROM order_catering_menu_item "
                         "LEFT JOIN catering_menu_items ON order_catering_menu_item.catering_menu_item_id = catering_menu_items.catering_menu_item_id "
                         "WHERE order_id = %s;",
-                        (order_id, )
+                        (order_id,)
                     )
                     await conn.commit()
                 except aiomysql.InterfaceError:
@@ -690,7 +707,7 @@ class DatabaseService:
                         item_id=order_catering_menu_item_raw[1],
                         name=order_catering_menu_item_raw[4],
                         additional_info=order_catering_menu_item_raw[5],
-                        price=order_catering_menu_item_raw[6],
+                        price=Decimal(order_catering_menu_item_raw[6]),
                         category=CateringMenuItemCategory(order_catering_menu_item_raw[7]),
                         is_disabled=bool(order_catering_menu_item_raw[8])
                     )] = order_catering_menu_item_raw[2]
@@ -718,7 +735,7 @@ class DatabaseService:
         async with self._connection_pool.acquire() as conn:
             async with conn.cursor(aiomysql.Cursor) as cursor:
                 try:
-                    await cursor.execute("SELECT (picture) FROM user_profile_picture WHERE user_id = %s", (user_id, ))
+                    await cursor.execute("SELECT (picture) FROM user_profile_picture WHERE user_id = %s", (user_id,))
                     await conn.commit()
                     r = await cursor.fetchone()
                     if r is None:

src/ez_lan_manager/services/TicketingService.py

@@ -8,15 +8,19 @@ from src.ez_lan_manager.types.Ticket import Ticket
 
 logger = logging.getLogger(__name__.split(".")[-1])
 
+
 class TicketNotAvailableError(Exception):
     def __init__(self, category: str):
         self.category = category
 
+
 class UserAlreadyHasTicketError(Exception):
     pass
 
+
 class TicketingService:
-    def __init__(self, ticket_infos: tuple[TicketInfo, ...], db_service: DatabaseService, accounting_service: AccountingService) -> None:
+    def __init__(self, ticket_infos: tuple[TicketInfo, ...], db_service: DatabaseService,
+                 accounting_service: AccountingService) -> None:
         self._ticket_infos = ticket_infos
         self._db_service = db_service
         self._accounting_service = accounting_service
@@ -75,7 +79,8 @@ class TicketingService:
 
         ticket_info = self.get_ticket_info_by_category(user_ticket.category)
         if await self._db_service.delete_ticket(user_ticket.ticket_id):
-            await self._accounting_service.add_balance(user_id, ticket_info.price, f"TICKET REFUND {user_ticket.ticket_id}")
+            await self._accounting_service.add_balance(user_id, ticket_info.price,
+                                                       f"TICKET REFUND {user_ticket.ticket_id}")
             logger.debug(f"User {user_id} refunded ticket {user_ticket.ticket_id}")
             return True
 

src/ez_lan_manager/types/CateringMenuItem.py

@@ -1,4 +1,5 @@
 from dataclasses import dataclass
+from decimal import Decimal
 from enum import StrEnum
 from typing import Self
 
@@ -19,7 +20,7 @@ class CateringMenuItemCategory(StrEnum):
 class CateringMenuItem:
     item_id: int
     name: str
-    price: int
+    price: Decimal
     category: CateringMenuItemCategory
     additional_info: str = str()
     is_disabled: bool = False

src/ez_lan_manager/types/CateringOrder.py

@@ -1,5 +1,6 @@
 from dataclasses import dataclass
 from datetime import datetime
+from decimal import Decimal
 from enum import StrEnum
 from typing import Optional, Iterable, Self
 
@@ -17,6 +18,7 @@ class CateringOrderStatus(StrEnum):
     COMPLETED = "COMPLETED"
     CANCELED = "CANCELED"
 
+
 @dataclass(frozen=True)
 class CateringOrder:
     order_id: int
@@ -27,8 +29,8 @@ class CateringOrder:
     is_delivery: bool = True
 
     @property
-    def price(self) -> int:
-        total = 0
+    def price(self) -> Decimal:
+        total = Decimal("0")
         for item, amount in self.items.items():
             total += (item.price * amount)
         return total

src/ez_lan_manager/types/ConfigurationTypes.py

@@ -1,11 +1,13 @@
 from dataclasses import dataclass
 from datetime import datetime
-from pathlib import Path
+
+from decimal import Decimal
 
 
 class NoSuchCategoryError(Exception):
     pass
 
+
 @dataclass(frozen=True)
 class DatabaseConfiguration:
     db_user: str
@@ -14,15 +16,17 @@ class DatabaseConfiguration:
     db_port: int
     db_name: str
 
+
 @dataclass(frozen=True)
 class TicketInfo:
     category: str
     total_tickets: int
-    price: int
+    price: Decimal
     description: str
     additional_info: str
     is_default: bool
 
+
 @dataclass(frozen=True)
 class MailingServiceConfiguration:
     smtp_server: str
@@ -31,6 +35,7 @@ class MailingServiceConfiguration:
     username: str
     password: str
 
+
 @dataclass(frozen=True)
 class LanInfo:
     name: str
@@ -39,6 +44,7 @@ class LanInfo:
     date_till: datetime
     organizer_mail: str
 
+
 @dataclass(frozen=True)
 class SeatingConfiguration:
     seats: dict[str, str]

src/ez_lan_manager/types/Transaction.py

@@ -1,11 +1,12 @@
 from dataclasses import dataclass
 from datetime import datetime
+from decimal import Decimal
 
 
 @dataclass(frozen=True)
 class Transaction:
     user_id: int
-    value: int
+    value: Decimal
     is_debit: bool
     reference: str
     transaction_date: datetime

testing/unittests/AccountingServiceTests.py

@@ -1,6 +1,7 @@
 import unittest
 from datetime import datetime
 from unittest.mock import MagicMock, AsyncMock
+from decimal import Decimal
 
 from src.ez_lan_manager.services.AccountingService import AccountingService, InsufficientFundsError
 from src.ez_lan_manager.types.Transaction import Transaction
@@ -12,7 +13,6 @@ class AccountingServiceTests(unittest.IsolatedAsyncioTestCase):
         self.mock_database_service.add_transaction = AsyncMock()
         self.accounting_service = AccountingService(self.mock_database_service)
 
-
     def test_importing_unit_under_test_works(self) -> None:
         """
         This test asserts that the object produced in setUp is AccountingService object,
@@ -21,59 +21,59 @@ class AccountingServiceTests(unittest.IsolatedAsyncioTestCase):
         self.assertIsInstance(self.accounting_service, AccountingService)
 
     def test_making_string_from_euro_value_works_correctly(self) -> None:
-        test_value = 13466
+        test_value = Decimal("134.66")
         expected_result = "134.66 €"
-        self.assertEqual(expected_result, AccountingService.make_euro_string_from_int(test_value))
+        self.assertEqual(expected_result, AccountingService.make_euro_string_from_decimal(test_value))
 
     def test_making_euro_string_from_negative_value_works_correctly(self) -> None:
-        test_value = -99741
+        test_value = Decimal("-997.41")
         expected_result = "-997.41 €"
-        self.assertEqual(expected_result, AccountingService.make_euro_string_from_int(test_value))
+        self.assertEqual(expected_result, AccountingService.make_euro_string_from_decimal(test_value))
 
     def test_making_euro_string_from_less_than_ten_cents_works_correctly(self) -> None:
-        test_value = 4
+        test_value = Decimal("0.04")
         expected_result = "0.04 €"
-        self.assertEqual(expected_result, AccountingService.make_euro_string_from_int(test_value))
+        self.assertEqual(expected_result, AccountingService.make_euro_string_from_decimal(test_value))
 
     async def test_get_balance_correctly_adds_up_transactions(self) -> None:
         self.mock_database_service.get_all_transactions_for_user = AsyncMock(return_value=[
             Transaction(
                 user_id=0,
-                value=5,
+                value=Decimal("0.05"),
                 is_debit=True,
                 reference="",
                 transaction_date=datetime.now()
             ),
             Transaction(
                 user_id=0,
-                value=99,
+                value=Decimal("0.99"),
                 is_debit=False,
                 reference="",
                 transaction_date=datetime.now()
             ),
             Transaction(
                 user_id=0,
-                value=101,
+                value=Decimal("1.01"),
                 is_debit=False,
                 reference="",
                 transaction_date=datetime.now()
             ),
             Transaction(
                 user_id=0,
-                value=77,
+                value=Decimal("0.77"),
                 is_debit=True,
                 reference="",
                 transaction_date=datetime.now()
             ),
         ])
-        expected_result = 118
+        expected_result = Decimal("1.18")
         actual_result = await self.accounting_service.get_balance(0)
 
         self.assertEqual(expected_result, actual_result)
 
     async def test_trying_to_remove_more_than_is_on_account_balance_raises_exception(self) -> None:
-        user_balance = 100
-        balance_to_remove = 101
+        user_balance = Decimal("1.00")
+        balance_to_remove = Decimal("1.01")
         self.mock_database_service.get_all_transactions_for_user = AsyncMock(return_value=[
             Transaction(
                 user_id=0,
@@ -88,8 +88,8 @@ class AccountingServiceTests(unittest.IsolatedAsyncioTestCase):
             await self.accounting_service.remove_balance(0, balance_to_remove, "TestRef")
 
     async def test_trying_to_remove_less_than_is_on_account_balance_spawns_correct_transaction(self) -> None:
-        user_balance = 101
-        balance_to_remove = 100
+        user_balance = Decimal("1.01")
+        balance_to_remove = Decimal("1.00")
         reference = "Yey, a reference"
 
         self.mock_database_service.get_all_transactions_for_user = AsyncMock(return_value=[