commit ff50ea67845488f41d3b887a5c73e56ea6967370
Author: Daniel Haus <daniel.haus@protonmail.com>
Date:   Wed Feb 11 14:57:06 2026 +0300

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bee8a64
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+__pycache__
diff --git a/config.py b/config.py
new file mode 100644
index 0000000..11c2488
--- /dev/null
+++ b/config.py
@@ -0,0 +1,8 @@
+DB_HOST = "localhost"
+DB_PORT = 5432
+DB_NAME = "toy_store_a"
+DB_USER = "postgres"
+DB_PASSWORD = "1234"
+
+DISCOUNT_COLOR = "#dbe68a"
+OUT_OF_STOCK_COLOR = "#565750"
diff --git a/controllers/auth_controller.py b/controllers/auth_controller.py
new file mode 100644
index 0000000..09bf310
--- /dev/null
+++ b/controllers/auth_controller.py
@@ -0,0 +1,48 @@
+from models.user_model import UserModel
+from views.login_view import LoginView
+from controllers.catalog_controller import CatalogController
+
+
+class AuthController:
+    def __init__(self, database):
+        self.database = database
+        self.model = UserModel(database)
+        self.view = LoginView()
+
+        self.view.login_button.clicked.connect(
+            self.login
+        )
+        self.view.guest_button.clicked.connect(
+            self.login_as_guest
+        )
+
+    def show(self):
+        self.view.show()
+
+    def login(self):
+        login = self.view.login_input.text()
+        password = self.view.password_input.text()
+        user = self.model.authenticate(login, password)
+
+        if user:
+            self.open_catalog(
+                user["full_name"],
+                user["role_name"],
+            )
+        else:
+            self.view.status_label.setText(
+                "Неверный логин или пароль"
+            )
+
+    def login_as_guest(self):
+        self.open_catalog("Гость", "Гость")
+
+    def open_catalog(self, full_name: str, role: str):
+        self.catalog = CatalogController(
+            self.database,
+            full_name,
+            role,
+            self,
+        )
+        self.catalog.show()
+        self.view.close()
diff --git a/controllers/catalog_controller.py b/controllers/catalog_controller.py
new file mode 100644
index 0000000..ba32ed4
--- /dev/null
+++ b/controllers/catalog_controller.py
@@ -0,0 +1,38 @@
+from models.toy_model import ToyModel
+from views.catalog_view import CatalogView
+
+
+class CatalogController:
+    def __init__(self, database, full_name, role, auth):
+        self.database = database
+        self.model = ToyModel(database)
+        self.view = CatalogView(full_name, role)
+        self.auth = auth
+        self.role = role
+
+        self.view.refresh_button.clicked.connect(
+            self.load_data
+        )
+        self.view.sort_button.clicked.connect(
+            self.sort_by_price
+        )
+        self.view.logout_button.clicked.connect(
+            self.logout
+        )
+
+        self.load_data()
+
+    def show(self):
+        self.view.show()
+
+    def load_data(self):
+        toys = self.model.get_all()
+        self.view.load_data(toys)
+
+    def sort_by_price(self):
+        toys = self.model.sort_by_price()
+        self.view.load_data(toys)
+
+    def logout(self):
+        self.view.close()
+        self.auth.show()
diff --git a/db.sql b/db.sql
new file mode 100644
index 0000000..397beba
--- /dev/null
+++ b/db.sql
@@ -0,0 +1,138 @@
+CREATE TABLE roles (
+    role_id SERIAL PRIMARY KEY,
+    role_name VARCHAR(50) NOT NULL
+);
+
+CREATE TABLE users (
+    user_id SERIAL PRIMARY KEY,
+    login VARCHAR(50) UNIQUE NOT NULL,
+    password VARCHAR(100) NOT NULL,
+    full_name VARCHAR(150) NOT NULL,
+    role_id INTEGER REFERENCES roles(role_id)
+);
+
+CREATE TABLE categories (
+    category_id SERIAL PRIMARY KEY,
+    category_name VARCHAR(100) NOT NULL
+);
+
+CREATE TABLE manufacturers (
+    manufacturer_id SERIAL PRIMARY KEY,
+    manufacturer_name VARCHAR(100) NOT NULL
+);
+
+CREATE TABLE suppliers (
+    supplier_id SERIAL PRIMARY KEY,
+    supplier_name VARCHAR(100) NOT NULL
+);
+
+CREATE TABLE age_groups (
+    age_group_id SERIAL PRIMARY KEY,
+    age_label VARCHAR(20) NOT NULL
+);
+
+CREATE TABLE toys (
+    toy_id SERIAL PRIMARY KEY,
+    toy_name VARCHAR(150) NOT NULL,
+    category_id INTEGER REFERENCES categories(category_id),
+    manufacturer_id INTEGER REFERENCES manufacturers(manufacturer_id),
+    price NUMERIC(10,2) NOT NULL,
+    discount INTEGER DEFAULT 0,
+    image VARCHAR(255)
+);
+
+CREATE TABLE toy_age_groups (
+    toy_id INTEGER REFERENCES toys(toy_id),
+    age_group_id INTEGER REFERENCES age_groups(age_group_id),
+    PRIMARY KEY (toy_id, age_group_id)
+);
+
+CREATE TABLE toy_suppliers (
+    toy_id INTEGER REFERENCES toys(toy_id),
+    supplier_id INTEGER REFERENCES suppliers(supplier_id),
+    PRIMARY KEY (toy_id, supplier_id)
+);
+
+CREATE TABLE stock (
+    toy_id INTEGER PRIMARY KEY REFERENCES toys(toy_id),
+    quantity INTEGER NOT NULL
+);
+
+INSERT INTO roles (role_name) VALUES
+('Гость'),
+('Покупатель'),
+('Сотрудник'),
+('Администратор');
+
+INSERT INTO users (login, password, full_name, role_id) VALUES
+('guest','guest','Гость',1),
+('anna','111','Иванова Анна Сергеевна',2),
+('oleg','222','Кузнецов Олег Петрович',2),
+('manager','333','Смирнова Мария Андреевна',3),
+('admin','admin','Сидоров Максим Игоревич',4);
+
+INSERT INTO categories (category_name) VALUES
+('Мягкие игрушки'),
+('Конструкторы'),
+('Развивающие игрушки'),
+('Настольные игры'),
+('Роботы');
+
+INSERT INTO manufacturers (manufacturer_name) VALUES
+('Lego'),
+('Hasbro'),
+('Mattel'),
+('PlaySmart'),
+('Fisher Price');
+
+INSERT INTO suppliers (supplier_name) VALUES
+('ООО Радуга'),
+('ИП Смайл'),('ToyImport'),
+('KidsWorld');
+
+INSERT INTO age_groups (age_label) VALUES
+('0-1'),
+('1-3'),
+('3-5'),
+('5-7'),
+('7+');
+
+INSERT INTO toys (toy_name, category_id, manufacturer_id, price, discount, image) VALUES
+('Плюшевый мишка',1,4,1500,10,'bear.png'),
+('Конструктор City',2,1,4200,25,'city.png'),
+('Развивающий куб',3,5,2300,0,NULL),
+('Робот трансформер',5,2,5200,30,'robot.png'),
+('Настольная игра Лото',4,3,1800,5,NULL),
+('Кукла классическая',1,3,2700,15,'doll.png'),
+('Конструктор Junior',2,1,3100,0,NULL),
+('Музыкальный телефон',3,5,2100,20,NULL),
+('Робот на пульте',5,2,6400,35,'rc.png'),
+('Игра Мемори',4,3,1600,0,NULL);
+
+INSERT INTO toy_age_groups (toy_id, age_group_id) VALUES
+(1,2),(1,3),
+(2,4),(2,5),
+(3,2),
+(4,4),(4,5),
+(5,3),(5,4),
+(6,3),(6,4),
+(7,2),(7,3),
+(8,2),
+(9,5),
+(10,3),(10,4);
+
+INSERT INTO toy_suppliers (toy_id, supplier_id) VALUES
+(1,1),(1,2),
+(2,3),
+(3,1),(3,4),
+(4,2),(4,3),
+(5,1),
+(6,4),
+(7,3),
+(8,2),(8,4),
+(9,3),
+(10,1),(10,2);
+
+INSERT INTO stock (toy_id, quantity) VALUES
+(1,12),(2,5),(3,0),(4,7),(5,10),
+(6,4),(7,8),(8,0),(9,3),(10,15);
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..b1466ed
--- /dev/null
+++ b/main.py
@@ -0,0 +1,16 @@
+import sys
+from PyQt6.QtWidgets import QApplication
+from models.database import Database
+from controllers.auth_controller import AuthController
+
+
+def main():
+    app = QApplication(sys.argv)
+    database = Database()
+    controller = AuthController(database)
+    controller.show()
+    sys.exit(app.exec())
+
+
+if __name__ == "__main__":
+    main()
diff --git a/models/__init__.py b/models/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/models/database.py b/models/database.py
new file mode 100644
index 0000000..8ec52a6
--- /dev/null
+++ b/models/database.py
@@ -0,0 +1,36 @@
+import psycopg2
+from psycopg2.extras import RealDictCursor
+from config import (
+    DB_HOST,
+    DB_PORT,
+    DB_NAME,
+    DB_USER,
+    DB_PASSWORD,
+)
+
+
+class Database:
+    def __init__(self):
+        self.connection = psycopg2.connect(
+            host=DB_HOST,
+            port=DB_PORT,
+            dbname=DB_NAME,
+            user=DB_USER,
+            password=DB_PASSWORD,
+            cursor_factory=RealDictCursor,
+        )
+
+    def fetch_all(self, query: str, params: tuple = ()):
+        with self.connection.cursor() as cursor:
+            cursor.execute(query, params)
+            return cursor.fetchall()
+
+    def fetch_one(self, query: str, params: tuple = ()):
+        with self.connection.cursor() as cursor:
+            cursor.execute(query, params)
+            return cursor.fetchone()
+
+    def execute(self, query: str, params: tuple = ()):
+        with self.connection.cursor() as cursor:
+            cursor.execute(query, params)
+            self.connection.commit()
diff --git a/models/toy_model.py b/models/toy_model.py
new file mode 100644
index 0000000..079744d
--- /dev/null
+++ b/models/toy_model.py
@@ -0,0 +1,87 @@
+from models.database import Database
+
+
+class ToyModel:
+    def __init__(self, database: Database):
+        self.database = database
+
+    def get_all(self):
+        query = """
+        SELECT t.toy_id,
+               t.toy_name,
+               c.category_name,
+               m.manufacturer_name,
+               t.price,
+               t.discount,
+               COALESCE(s.quantity, 0) AS quantity,
+               STRING_AGG(DISTINCT a.age_label, ', ') AS ages,
+               STRING_AGG(DISTINCT sup.supplier_name, ', ') AS suppliers
+        FROM toys t
+        JOIN categories c ON t.category_id = c.category_id
+        JOIN manufacturers m ON t.manufacturer_id = m.manufacturer_id
+        LEFT JOIN stock s ON t.toy_id = s.toy_id
+        LEFT JOIN toy_age_groups ta ON t.toy_id = ta.toy_id
+        LEFT JOIN age_groups a ON ta.age_group_id = a.age_group_id
+        LEFT JOIN toy_suppliers ts ON t.toy_id = ts.toy_id
+        LEFT JOIN suppliers sup ON ts.supplier_id = sup.supplier_id
+        GROUP BY t.toy_id, c.category_name,
+                 m.manufacturer_name, s.quantity
+        ORDER BY t.toy_name
+        """
+        return self.database.fetch_all(query)
+
+    def search_by_age(self, age: str):
+        query = """
+        SELECT *
+        FROM (
+            SELECT t.toy_id,
+                   t.toy_name,
+                   c.category_name,
+                   m.manufacturer_name,
+                   t.price,
+                   t.discount,
+                   COALESCE(s.quantity, 0) AS quantity,
+                   STRING_AGG(DISTINCT a.age_label, ', ') AS ages,
+                   STRING_AGG(DISTINCT sup.supplier_name, ', ') AS suppliers
+            FROM toys t
+            JOIN categories c ON t.category_id = c.category_id
+            JOIN manufacturers m ON t.manufacturer_id = m.manufacturer_id
+            LEFT JOIN stock s ON t.toy_id = s.toy_id
+            LEFT JOIN toy_age_groups ta ON t.toy_id = ta.toy_id
+            LEFT JOIN age_groups a ON ta.age_group_id = a.age_group_id
+            LEFT JOIN toy_suppliers ts ON t.toy_id = ts.toy_id
+            LEFT JOIN suppliers sup ON ts.supplier_id = sup.supplier_id
+            GROUP BY t.toy_id, c.category_name,
+                     m.manufacturer_name, s.quantity
+        ) sub
+        WHERE ages ILIKE %s
+        """
+        return self.database.fetch_all(query, (f"%{age}%",))
+
+    def sort_by_price(self):
+        query = """
+        SELECT *
+        FROM (
+            SELECT t.toy_id,
+                   t.toy_name,
+                   c.category_name,
+                   m.manufacturer_name,
+                   t.price,
+                   t.discount,
+                   COALESCE(s.quantity, 0) AS quantity,
+                   STRING_AGG(DISTINCT a.age_label, ', ') AS ages,
+                   STRING_AGG(DISTINCT sup.supplier_name, ', ') AS suppliers
+            FROM toys t
+            JOIN categories c ON t.category_id = c.category_id
+            JOIN manufacturers m ON t.manufacturer_id = m.manufacturer_id
+            LEFT JOIN stock s ON t.toy_id = s.toy_id
+            LEFT JOIN toy_age_groups ta ON t.toy_id = ta.toy_id
+            LEFT JOIN age_groups a ON ta.age_group_id = a.age_group_id
+            LEFT JOIN toy_suppliers ts ON t.toy_id = ts.toy_id
+            LEFT JOIN suppliers sup ON ts.supplier_id = sup.supplier_id
+            GROUP BY t.toy_id, c.category_name,
+                     m.manufacturer_name, s.quantity
+        ) sub
+        ORDER BY price
+        """
+        return self.database.fetch_all(query)
diff --git a/models/user_model.py b/models/user_model.py
new file mode 100644
index 0000000..3d7af3e
--- /dev/null
+++ b/models/user_model.py
@@ -0,0 +1,17 @@
+from models.database import Database
+
+
+class UserModel:
+    def __init__(self, database: Database):
+        self.database = database
+
+    def authenticate(self, login: str, password: str):
+        query = """
+        SELECT u.user_id,
+               u.full_name,
+               r.role_name
+        FROM users u
+        JOIN roles r ON u.role_id = r.role_id
+        WHERE u.login = %s AND u.password = %s
+        """
+        return self.database.fetch_one(query, (login, password))
diff --git a/views/catalog_view.py b/views/catalog_view.py
new file mode 100644
index 0000000..0d317ee
--- /dev/null
+++ b/views/catalog_view.py
@@ -0,0 +1,82 @@
+from PyQt6.QtWidgets import (
+    QWidget,
+    QVBoxLayout,
+    QPushButton,
+    QLabel,
+    QTableWidget,
+    QTableWidgetItem,
+)
+from PyQt6.QtGui import QColor
+from config import DISCOUNT_COLOR, OUT_OF_STOCK_COLOR
+
+
+class CatalogView(QWidget):
+    def __init__(self, full_name: str, role: str):
+        super().__init__()
+        self.setWindowTitle("Каталог игрушек")
+
+        self.layout = QVBoxLayout()
+
+        self.user_label = QLabel(
+            f"{full_name} ({role})"
+        )
+
+        self.refresh_button = QPushButton("Обновить")
+        self.sort_button = QPushButton("Сортировать по цене")
+        self.logout_button = QPushButton("Выйти")
+
+        self.table = QTableWidget()
+
+        self.layout.addWidget(self.user_label)
+        self.layout.addWidget(self.refresh_button)
+        self.layout.addWidget(self.sort_button)
+        self.layout.addWidget(self.table)
+        self.layout.addWidget(self.logout_button)
+
+        self.setLayout(self.layout)
+
+        self.setFixedSize(860, 500)
+
+    def load_data(self, toys: list):
+        headers = [
+            "Название",
+            "Категория",
+            "Производитель",
+            "Возраст",
+            "Поставщик",
+            "Цена",
+            "Скидка",
+            "Остаток",
+        ]
+
+        self.table.setColumnCount(len(headers))
+        self.table.setHorizontalHeaderLabels(headers)
+        self.table.setRowCount(len(toys))
+
+        for row, toy in enumerate(toys):
+            values = [
+                toy["toy_name"],
+                toy["category_name"],
+                toy["manufacturer_name"],
+                toy["ages"],
+                toy["suppliers"],
+                str(toy["price"]),
+                str(toy["discount"]),
+                str(toy["quantity"]),
+            ]
+
+            for col, value in enumerate(values):
+                item = QTableWidgetItem(value)
+                self.table.setItem(row, col, item)
+
+            if toy["discount"] >= 25:
+                for col in range(len(headers)):
+                    self.table.item(row, col).setBackground(
+                        QColor(DISCOUNT_COLOR)
+                    )
+
+            if toy["quantity"] == 0:
+                for col in range(len(headers)):
+                    self.table.item(row, col).setBackground(
+                        QColor(OUT_OF_STOCK_COLOR)
+                    )
diff --git a/views/login_view.py b/views/login_view.py
new file mode 100644
index 0000000..6ea3d24
--- /dev/null
+++ b/views/login_view.py
@@ -0,0 +1,38 @@
+from PyQt6.QtWidgets import (
+    QWidget,
+    QVBoxLayout,
+    QLineEdit,
+    QPushButton,
+    QLabel,
+)
+
+
+class LoginView(QWidget):
+    def __init__(self):
+        super().__init__()
+        self.setWindowTitle("Авторизация")
+
+        self.layout = QVBoxLayout()
+
+        self.login_input = QLineEdit()
+        self.login_input.setPlaceholderText("Логин")
+
+        self.password_input = QLineEdit()
+        self.password_input.setPlaceholderText("Пароль")
+        self.password_input.setEchoMode(
+            QLineEdit.EchoMode.Password
+        )
+
+        self.login_button = QPushButton("Войти")
+        self.guest_button = QPushButton("Войти как гость")
+        self.status_label = QLabel()
+
+        self.layout.addWidget(self.login_input)
+        self.layout.addWidget(self.password_input)
+        self.layout.addWidget(self.login_button)
+        self.layout.addWidget(self.guest_button)
+        self.layout.addWidget(self.status_label)
+
+        self.setLayout(self.layout)
+
+        self.setFixedSize(240, 180)