Create e-commerce API with FastAPI and SQLite

README.md

@@ -1,3 +1,187 @@
-# FastAPI Application
+# E-Commerce API
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A FastAPI-based RESTful API for an e-commerce application with user authentication, product catalog, shopping cart, order processing, and payment processing.
+
+## Features
+
+- User authentication with JWT
+- Product catalog with categories
+- Shopping cart functionality
+- Order management
+- Mock payment processing
+- Search and filtering products
+- Admin and regular user roles
+
+## Technology Stack
+
+- **Framework**: FastAPI
+- **Database**: SQLite
+- **ORM**: SQLAlchemy
+- **Migration Tool**: Alembic
+- **Authentication**: JWT with password hashing
+
+## Project Structure
+
+```
+ecommerce-api/
+├── app/
+│   ├── api/
+│   │   ├── deps.py
+│   │   └── v1/
+│   │       ├── api.py
+│   │       └── endpoints/
+│   │           ├── auth.py
+│   │           ├── cart.py
+│   │           ├── categories.py
+│   │           ├── health.py
+│   │           ├── orders.py
+│   │           ├── payments.py
+│   │           ├── products.py
+│   │           └── users.py
+│   ├── core/
+│   │   ├── config.py
+│   │   └── security.py
+│   ├── db/
+│   │   └── session.py
+│   ├── models/
+│   │   ├── base.py
+│   │   ├── cart.py
+│   │   ├── order.py
+│   │   ├── product.py
+│   │   └── user.py
+│   ├── schemas/
+│   │   ├── cart.py
+│   │   ├── order.py
+│   │   ├── product.py
+│   │   ├── token.py
+│   │   └── user.py
+│   └── services/
+├── migrations/
+│   ├── env.py
+│   ├── script.py.mako
+│   └── versions/
+│       └── 0001_create_tables.py
+├── storage/
+│   └── db/
+├── alembic.ini
+├── main.py
+└── requirements.txt
+```
+
+## Setup and Installation
+
+### 1. Clone the repository
+
+```bash
+git clone https://github.com/your-username/ecommerce-api.git
+cd ecommerce-api
+```
+
+### 2. Create a virtual environment
+
+```bash
+python -m venv venv
+source venv/bin/activate  # On Windows: venv\Scripts\activate
+```
+
+### 3. Install dependencies
+
+```bash
+pip install -r requirements.txt
+```
+
+### 4. Set up environment variables
+
+Create a `.env` file in the root directory:
+
+```
+JWT_SECRET_KEY=your_secret_key_here
+```
+
+### 5. Initialize the database
+
+```bash
+alembic upgrade head
+```
+
+### 6. Run the application
+
+```bash
+uvicorn main:app --reload
+```
+
+The API will be available at http://localhost:8000.
+
+## API Documentation
+
+Once the application is running, you can access the API documentation at:
+
+- Swagger UI: http://localhost:8000/docs
+- ReDoc: http://localhost:8000/redoc
+
+## API Endpoints
+
+### Authentication
+
+- `POST /api/v1/auth/register` - Register a new user
+- `POST /api/v1/auth/login` - Login and get access token
+
+### Users
+
+- `GET /api/v1/users/me` - Get current user information
+- `PUT /api/v1/users/me` - Update current user information
+- `GET /api/v1/users/{user_id}` - Get user by ID (admin only)
+- `GET /api/v1/users/` - List all users (admin only)
+
+### Categories
+
+- `GET /api/v1/categories/` - List all categories
+- `POST /api/v1/categories/` - Create a new category (admin only)
+- `GET /api/v1/categories/{category_id}` - Get category by ID
+- `PUT /api/v1/categories/{category_id}` - Update a category (admin only)
+- `DELETE /api/v1/categories/{category_id}` - Delete a category (admin only)
+
+### Products
+
+- `GET /api/v1/products/` - List all products (with filtering options)
+- `POST /api/v1/products/` - Create a new product (admin only)
+- `GET /api/v1/products/{product_id}` - Get product by ID
+- `PUT /api/v1/products/{product_id}` - Update a product (admin only)
+- `DELETE /api/v1/products/{product_id}` - Delete a product (admin only)
+
+### Cart
+
+- `GET /api/v1/cart/` - Get user's cart
+- `POST /api/v1/cart/items` - Add item to cart
+- `PUT /api/v1/cart/items/{item_id}` - Update cart item quantity
+- `DELETE /api/v1/cart/items/{item_id}` - Remove item from cart
+- `DELETE /api/v1/cart/` - Clear cart
+
+### Orders
+
+- `GET /api/v1/orders/` - List user's orders (admin can see all)
+- `POST /api/v1/orders/` - Create a new order from cart
+- `GET /api/v1/orders/{order_id}` - Get order by ID
+- `PUT /api/v1/orders/{order_id}` - Update order (limited for regular users)
+- `DELETE /api/v1/orders/{order_id}` - Cancel order
+
+### Payments
+
+- `POST /api/v1/payments/` - Process payment for an order
+
+### Health Check
+
+- `GET /health` - Application health check
+- `GET /api/v1/health/` - Detailed health check
+
+## Environment Variables
+
+| Variable | Description | Default |
+|----------|-------------|---------|
+| JWT_SECRET_KEY | Secret key for JWT token generation | supersecretkey |
+| JWT_ALGORITHM | Algorithm used for JWT | HS256 |
+| ACCESS_TOKEN_EXPIRE_MINUTES | Token expiration time in minutes | 30 |
+
+## Database
+
+The application uses SQLite as the database. The database file is created at `/app/storage/db/db.sqlite`.

alembic.ini

@@ -0,0 +1,85 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = migrations
+
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# timezone to use when rendering the date
+# within the migration file as well as the filename.
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; this defaults
+# to migrations/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path
+# version_locations = %(here)s/bar %(here)s/bat migrations/versions
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+# SQLite URL
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks=black
+# black.type=console_scripts
+# black.entrypoint=black
+# black.options=-l 79
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

app/__init__.py

@@ -0,0 +1 @@
+# This file marks the app directory as a Python package

app/api/__init__.py

@@ -0,0 +1 @@
+# This file marks the api directory as a Python package

app/api/deps.py

@@ -0,0 +1,63 @@
+
+from fastapi import Depends, HTTPException, status
+from jose import jwt
+from pydantic import ValidationError
+from sqlalchemy.orm import Session
+
+from app.core.config import settings
+from app.core.security import oauth2_scheme
+from app.db.session import get_db
+from app.models.user import User
+from app.schemas.token import TokenPayload
+
+
+def get_current_user(
+    db: Session = Depends(get_db), token: str = Depends(oauth2_scheme)
+) -> User:
+    """
+    Get current user from token.
+    """
+    try:
+        payload = jwt.decode(
+            token, settings.JWT_SECRET_KEY, algorithms=[settings.JWT_ALGORITHM]
+        )
+        token_data = TokenPayload(**payload)
+    except (jwt.JWTError, ValidationError):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Could not validate credentials",
+        )
+    
+    user = db.query(User).filter(User.id == token_data.sub).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    if not user.is_active:
+        raise HTTPException(status_code=400, detail="Inactive user")
+    
+    return user
+
+
+def get_current_active_user(
+    current_user: User = Depends(get_current_user),
+) -> User:
+    """
+    Get current active user.
+    """
+    if not current_user.is_active:
+        raise HTTPException(status_code=400, detail="Inactive user")
+    return current_user
+
+
+def get_current_active_admin(
+    current_user: User = Depends(get_current_user),
+) -> User:
+    """
+    Get current active admin user.
+    """
+    if not current_user.is_active:
+        raise HTTPException(status_code=400, detail="Inactive user")
+    if not current_user.is_admin:
+        raise HTTPException(
+            status_code=403, detail="The user doesn't have enough privileges"
+        )
+    return current_user

app/api/v1/__init__.py

@@ -0,0 +1 @@
+# This file marks the v1 directory as a Python package

app/api/v1/api.py

@@ -0,0 +1,16 @@
+from fastapi import APIRouter
+
+from app.api.v1.endpoints import auth, cart, categories, health, orders, payments, products, users
+from app.core.config import settings
+
+api_router = APIRouter(prefix=settings.API_V1_STR)
+
+# Include routers for different modules
+api_router.include_router(auth.router, prefix="/auth", tags=["authentication"])
+api_router.include_router(users.router, prefix="/users", tags=["users"])
+api_router.include_router(categories.router, prefix="/categories", tags=["categories"])
+api_router.include_router(products.router, prefix="/products", tags=["products"])
+api_router.include_router(cart.router, prefix="/cart", tags=["cart"])
+api_router.include_router(orders.router, prefix="/orders", tags=["orders"])
+api_router.include_router(payments.router, prefix="/payments", tags=["payments"])
+api_router.include_router(health.router, prefix="/health", tags=["health"])

app/api/v1/endpoints/__init__.py

@@ -0,0 +1 @@
+# This file marks the endpoints directory as a Python package

app/api/v1/endpoints/auth.py

@@ -0,0 +1,84 @@
+from datetime import timedelta
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordRequestForm
+from sqlalchemy.orm import Session
+
+from app.core.config import settings
+from app.core.security import create_access_token, get_password_hash, verify_password
+from app.db.session import get_db
+from app.models.user import User
+from app.schemas.token import Token
+from app.schemas.user import UserCreate
+
+router = APIRouter()
+
+
+@router.post("/login", response_model=Token)
+def login_access_token(
+    db: Session = Depends(get_db), form_data: OAuth2PasswordRequestForm = Depends()
+) -> Any:
+    """
+    OAuth2 compatible token login, get an access token for future requests.
+    """
+    user = db.query(User).filter(User.email == form_data.username).first()
+    if not user or not verify_password(form_data.password, user.hashed_password):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect email or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    if not user.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST, detail="Inactive user"
+        )
+    
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    
+    return {
+        "access_token": create_access_token(
+            user.id, expires_delta=access_token_expires
+        ),
+        "token_type": "bearer",
+    }
+
+
+@router.post("/register", response_model=Token)
+def register_user(
+    *, db: Session = Depends(get_db), user_in: UserCreate
+) -> Any:
+    """
+    Register a new user and return an access token.
+    """
+    # Check if user already exists
+    user = db.query(User).filter(User.email == user_in.email).first()
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="A user with this email already exists",
+        )
+    
+    # Create new user
+    db_user = User(
+        email=user_in.email,
+        hashed_password=get_password_hash(user_in.password),
+        full_name=user_in.full_name,
+        phone=user_in.phone,
+        address=user_in.address,
+        is_active=user_in.is_active,
+        is_admin=user_in.is_admin,
+    )
+    db.add(db_user)
+    db.commit()
+    db.refresh(db_user)
+    
+    # Create access token
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    
+    return {
+        "access_token": create_access_token(
+            db_user.id, expires_delta=access_token_expires
+        ),
+        "token_type": "bearer",
+    }

app/api/v1/endpoints/cart.py

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+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_user
+from app.db.session import get_db
+from app.models.cart import CartItem
+from app.models.product import Product
+from app.models.user import User
+from app.schemas.cart import Cart, CartItem as CartItemSchema
+from app.schemas.cart import CartItemCreate, CartItemUpdate
+
+router = APIRouter()
+
+
+@router.get("/", response_model=Cart)
+def read_cart(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+) -> Any:
+    """
+    Retrieve current user's cart.
+    """
+    cart_items = db.query(CartItem).filter(CartItem.user_id == current_user.id).all()
+    
+    # Calculate total
+    total = 0.0
+    for item in cart_items:
+        product = db.query(Product).filter(Product.id == item.product_id).first()
+        if product:
+            total += product.price * item.quantity
+    
+    return {
+        "items": cart_items,
+        "total": total,
+    }
+
+
+@router.post("/items", response_model=CartItemSchema)
+def add_to_cart(
+    *,
+    db: Session = Depends(get_db),
+    item_in: CartItemCreate,
+    current_user: User = Depends(get_current_user),
+) -> Any:
+    """
+    Add item to cart.
+    """
+    # Check if product exists and is active
+    product = db.query(Product).filter(Product.id == item_in.product_id).first()
+    if not product or not product.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Product not found",
+        )
+    
+    # Check if product has enough stock
+    if product.stock_quantity < item_in.quantity:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Not enough stock available",
+        )
+    
+    # Check if item is already in cart
+    cart_item = db.query(CartItem).filter(
+        CartItem.user_id == current_user.id,
+        CartItem.product_id == item_in.product_id,
+    ).first()
+    
+    if cart_item:
+        # Update quantity
+        cart_item.quantity += item_in.quantity
+        db.add(cart_item)
+        db.commit()
+        db.refresh(cart_item)
+        return cart_item
+    
+    # Create new cart item
+    cart_item = CartItem(
+        user_id=current_user.id,
+        product_id=item_in.product_id,
+        quantity=item_in.quantity,
+    )
+    db.add(cart_item)
+    db.commit()
+    db.refresh(cart_item)
+    return cart_item
+
+
+@router.put("/items/{item_id}", response_model=CartItemSchema)
+def update_cart_item(
+    *,
+    db: Session = Depends(get_db),
+    item_id: str,
+    item_in: CartItemUpdate,
+    current_user: User = Depends(get_current_user),
+) -> Any:
+    """
+    Update cart item quantity.
+    """
+    cart_item = db.query(CartItem).filter(
+        CartItem.id == item_id,
+        CartItem.user_id == current_user.id,
+    ).first()
+    
+    if not cart_item:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Cart item not found",
+        )
+    
+    # Check if product has enough stock
+    product = db.query(Product).filter(Product.id == cart_item.product_id).first()
+    if not product or not product.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Product not found",
+        )
+    
+    if product.stock_quantity < item_in.quantity:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Not enough stock available",
+        )
+    
+    cart_item.quantity = item_in.quantity
+    db.add(cart_item)
+    db.commit()
+    db.refresh(cart_item)
+    return cart_item
+
+
+@router.delete("/items/{item_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def remove_cart_item(
+    *,
+    db: Session = Depends(get_db),
+    item_id: str,
+    current_user: User = Depends(get_current_user),
+) -> Any:
+    """
+    Remove item from cart.
+    """
+    cart_item = db.query(CartItem).filter(
+        CartItem.id == item_id,
+        CartItem.user_id == current_user.id,
+    ).first()
+    
+    if not cart_item:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Cart item not found",
+        )
+    
+    db.delete(cart_item)
+    db.commit()
+    
+    return None
+
+
+@router.delete("/", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def clear_cart(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+) -> Any:
+    """
+    Clear cart.
+    """
+    db.query(CartItem).filter(CartItem.user_id == current_user.id).delete()
+    db.commit()
+    
+    return None

app/api/v1/endpoints/categories.py

@@ -0,0 +1,119 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_active_admin
+from app.db.session import get_db
+from app.models.product import Category
+from app.models.user import User
+from app.schemas.product import Category as CategorySchema
+from app.schemas.product import CategoryCreate, CategoryUpdate
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[CategorySchema])
+def read_categories(
+    db: Session = Depends(get_db),
+    skip: int = 0,
+    limit: int = 100,
+) -> Any:
+    """
+    Retrieve categories.
+    """
+    categories = db.query(Category).offset(skip).limit(limit).all()
+    return categories
+
+
+@router.post("/", response_model=CategorySchema)
+def create_category(
+    *,
+    db: Session = Depends(get_db),
+    category_in: CategoryCreate,
+    current_user: User = Depends(get_current_active_admin),
+) -> Any:
+    """
+    Create new category. Only admin users can create categories.
+    """
+    # Check if category with the same name already exists
+    category = db.query(Category).filter(Category.name == category_in.name).first()
+    if category:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Category with this name already exists",
+        )
+    
+    category = Category(**category_in.dict())
+    db.add(category)
+    db.commit()
+    db.refresh(category)
+    return category
+
+
+@router.get("/{category_id}", response_model=CategorySchema)
+def read_category(
+    *,
+    db: Session = Depends(get_db),
+    category_id: str,
+) -> Any:
+    """
+    Get category by ID.
+    """
+    category = db.query(Category).filter(Category.id == category_id).first()
+    if not category:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Category not found",
+        )
+    return category
+
+
+@router.put("/{category_id}", response_model=CategorySchema)
+def update_category(
+    *,
+    db: Session = Depends(get_db),
+    category_id: str,
+    category_in: CategoryUpdate,
+    current_user: User = Depends(get_current_active_admin),
+) -> Any:
+    """
+    Update a category. Only admin users can update categories.
+    """
+    category = db.query(Category).filter(Category.id == category_id).first()
+    if not category:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Category not found",
+        )
+    
+    update_data = category_in.dict(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(category, field, value)
+    
+    db.add(category)
+    db.commit()
+    db.refresh(category)
+    return category
+
+
+@router.delete("/{category_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def delete_category(
+    *,
+    db: Session = Depends(get_db),
+    category_id: str,
+    current_user: User = Depends(get_current_active_admin),
+) -> Any:
+    """
+    Delete a category. Only admin users can delete categories.
+    """
+    category = db.query(Category).filter(Category.id == category_id).first()
+    if not category:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Category not found",
+        )
+    
+    db.delete(category)
+    db.commit()
+    return None

app/api/v1/endpoints/health.py

@@ -0,0 +1,29 @@
+from typing import Any, Dict
+
+from fastapi import APIRouter, Depends
+from sqlalchemy.orm import Session
+
+from app.core.config import settings
+from app.db.session import get_db
+
+router = APIRouter()
+
+
+@router.get("/", response_model=Dict[str, Any])
+async def health_check(db: Session = Depends(get_db)) -> Any:
+    """
+    Check API health.
+    """
+    # Check if database connection is working
+    db_status = "healthy"
+    try:
+        # Try executing a simple query
+        db.execute("SELECT 1")
+    except Exception:
+        db_status = "unhealthy"
+    
+    return {
+        "status": "healthy",
+        "version": settings.PROJECT_VERSION,
+        "database": db_status,
+    }

app/api/v1/endpoints/orders.py

@@ -0,0 +1,250 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_user
+from app.db.session import get_db
+from app.models.cart import CartItem
+from app.models.order import Order, OrderItem, OrderStatus
+from app.models.product import Product
+from app.models.user import User
+from app.schemas.order import Order as OrderSchema
+from app.schemas.order import OrderCreate, OrderUpdate
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[OrderSchema])
+def read_orders(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+    skip: int = 0,
+    limit: int = 100,
+) -> Any:
+    """
+    Retrieve orders.
+    """
+    # If user is admin, return all orders
+    if current_user.is_admin:
+        orders = db.query(Order).offset(skip).limit(limit).all()
+    else:
+        # If user is not admin, return only their orders
+        orders = db.query(Order).filter(Order.user_id == current_user.id).offset(skip).limit(limit).all()
+    
+    return orders
+
+
+@router.post("/", response_model=OrderSchema)
+def create_order(
+    *,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+    order_in: OrderCreate = None,
+) -> Any:
+    """
+    Create new order from cart.
+    """
+    # Get cart items
+    cart_items = db.query(CartItem).filter(CartItem.user_id == current_user.id).all()
+    
+    if not cart_items:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Cart is empty",
+        )
+    
+    # Calculate total amount
+    total_amount = 0.0
+    order_items_data = []
+    
+    for cart_item in cart_items:
+        product = db.query(Product).filter(Product.id == cart_item.product_id).first()
+        
+        if not product or not product.is_active:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail=f"Product {cart_item.product_id} not found or not active",
+            )
+        
+        # Check if product has enough stock
+        if product.stock_quantity < cart_item.quantity:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail=f"Not enough stock for product {product.name}",
+            )
+        
+        # Add to total
+        item_total = product.price * cart_item.quantity
+        total_amount += item_total
+        
+        # Prepare order item data
+        order_items_data.append({
+            "product_id": product.id,
+            "quantity": cart_item.quantity,
+            "price": product.price,
+        })
+        
+        # Update product stock
+        product.stock_quantity -= cart_item.quantity
+        db.add(product)
+    
+    # Create order
+    order_data = {
+        "user_id": current_user.id,
+        "total_amount": total_amount,
+        "status": OrderStatus.PENDING,
+    }
+    
+    if order_in:
+        order_data.update({
+            "shipping_address": order_in.shipping_address,
+            "tracking_number": order_in.tracking_number,
+            "payment_id": order_in.payment_id,
+            "status": order_in.status,
+        })
+    
+    order = Order(**order_data)
+    db.add(order)
+    db.commit()
+    db.refresh(order)
+    
+    # Create order items
+    for item_data in order_items_data:
+        order_item = OrderItem(
+            order_id=order.id,
+            **item_data,
+        )
+        db.add(order_item)
+    
+    db.commit()
+    
+    # Clear cart
+    db.query(CartItem).filter(CartItem.user_id == current_user.id).delete()
+    db.commit()
+    
+    # Refresh order to get items
+    db.refresh(order)
+    
+    return order
+
+
+@router.get("/{order_id}", response_model=OrderSchema)
+def read_order(
+    *,
+    db: Session = Depends(get_db),
+    order_id: str,
+    current_user: User = Depends(get_current_user),
+) -> Any:
+    """
+    Get order by ID.
+    """
+    order = db.query(Order).filter(Order.id == order_id).first()
+    
+    if not order:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Order not found",
+        )
+    
+    # Check permissions
+    if not current_user.is_admin and order.user_id != current_user.id:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions",
+        )
+    
+    return order
+
+
+@router.put("/{order_id}", response_model=OrderSchema)
+def update_order(
+    *,
+    db: Session = Depends(get_db),
+    order_id: str,
+    order_in: OrderUpdate,
+    current_user: User = Depends(get_current_user),
+) -> Any:
+    """
+    Update an order. Only admin users can update any order. Regular users can only update their own orders.
+    """
+    order = db.query(Order).filter(Order.id == order_id).first()
+    
+    if not order:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Order not found",
+        )
+    
+    # Check permissions
+    if not current_user.is_admin and order.user_id != current_user.id:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions",
+        )
+    
+    # Regular users can only update shipping address
+    if not current_user.is_admin:
+        if hasattr(order_in, "status") and order_in.status != order.status:
+            raise HTTPException(
+                status_code=status.HTTP_403_FORBIDDEN,
+                detail="Cannot update order status",
+            )
+    
+    update_data = order_in.dict(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(order, field, value)
+    
+    db.add(order)
+    db.commit()
+    db.refresh(order)
+    
+    return order
+
+
+@router.delete("/{order_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def cancel_order(
+    *,
+    db: Session = Depends(get_db),
+    order_id: str,
+    current_user: User = Depends(get_current_user),
+) -> Any:
+    """
+    Cancel an order. Only admin users can cancel any order. Regular users can only cancel their own orders.
+    """
+    order = db.query(Order).filter(Order.id == order_id).first()
+    
+    if not order:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Order not found",
+        )
+    
+    # Check permissions
+    if not current_user.is_admin and order.user_id != current_user.id:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions",
+        )
+    
+    # Check if order can be cancelled
+    if order.status not in [OrderStatus.PENDING, OrderStatus.PAID]:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=f"Cannot cancel order with status {order.status}",
+        )
+    
+    # Restore product stock
+    order_items = db.query(OrderItem).filter(OrderItem.order_id == order.id).all()
+    for item in order_items:
+        product = db.query(Product).filter(Product.id == item.product_id).first()
+        if product:
+            product.stock_quantity += item.quantity
+            db.add(product)
+    
+    # Update order status
+    order.status = OrderStatus.CANCELLED
+    db.add(order)
+    db.commit()
+    
+    return None

app/api/v1/endpoints/payments.py

@@ -0,0 +1,81 @@
+import uuid
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_user
+from app.db.session import get_db
+from app.models.order import Order, OrderStatus
+from app.models.user import User
+
+router = APIRouter()
+
+
+class PaymentRequest(BaseModel):
+    order_id: str
+    payment_method: str
+    card_number: str
+    card_expiry: str
+    card_cvv: str
+
+
+class PaymentResponse(BaseModel):
+    payment_id: str
+    order_id: str
+    amount: float
+    status: str
+    message: str
+
+
+@router.post("/", response_model=PaymentResponse)
+def process_payment(
+    *,
+    db: Session = Depends(get_db),
+    payment_in: PaymentRequest,
+    current_user: User = Depends(get_current_user),
+) -> Any:
+    """
+    Process payment for an order. This is a mock implementation.
+    """
+    # Get order
+    order = db.query(Order).filter(Order.id == payment_in.order_id).first()
+    
+    if not order:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Order not found",
+        )
+    
+    # Check permissions
+    if order.user_id != current_user.id:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions",
+        )
+    
+    # Check if order can be paid
+    if order.status != OrderStatus.PENDING:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=f"Cannot process payment for order with status {order.status}",
+        )
+    
+    # Mock payment processing
+    # In a real application, this would integrate with a payment gateway
+    payment_id = str(uuid.uuid4())
+    
+    # Update order status and payment ID
+    order.status = OrderStatus.PAID
+    order.payment_id = payment_id
+    db.add(order)
+    db.commit()
+    
+    return {
+        "payment_id": payment_id,
+        "order_id": order.id,
+        "amount": order.total_amount,
+        "status": "success",
+        "message": "Payment processed successfully",
+    }

app/api/v1/endpoints/products.py

@@ -0,0 +1,143 @@
+from typing import Any, List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_active_admin
+from app.db.session import get_db
+from app.models.product import Product
+from app.models.user import User
+from app.schemas.product import Product as ProductSchema
+from app.schemas.product import ProductCreate, ProductUpdate
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[ProductSchema])
+def read_products(
+    db: Session = Depends(get_db),
+    skip: int = 0,
+    limit: int = 100,
+    category_id: Optional[str] = None,
+    name: Optional[str] = None,
+    min_price: Optional[float] = None,
+    max_price: Optional[float] = None,
+) -> Any:
+    """
+    Retrieve products with optional filtering.
+    """
+    query = db.query(Product)
+    
+    # Apply filters if provided
+    if category_id:
+        query = query.filter(Product.category_id == category_id)
+    
+    if name:
+        query = query.filter(Product.name.ilike(f"%{name}%"))
+    
+    if min_price is not None:
+        query = query.filter(Product.price >= min_price)
+    
+    if max_price is not None:
+        query = query.filter(Product.price <= max_price)
+    
+    # Only show active products
+    query = query.filter(Product.is_active.is_(True))
+    
+    products = query.offset(skip).limit(limit).all()
+    return products
+
+
+@router.post("/", response_model=ProductSchema)
+def create_product(
+    *,
+    db: Session = Depends(get_db),
+    product_in: ProductCreate,
+    current_user: User = Depends(get_current_active_admin),
+) -> Any:
+    """
+    Create new product. Only admin users can create products.
+    """
+    product = Product(**product_in.dict())
+    db.add(product)
+    db.commit()
+    db.refresh(product)
+    return product
+
+
+@router.get("/{product_id}", response_model=ProductSchema)
+def read_product(
+    *,
+    db: Session = Depends(get_db),
+    product_id: str,
+) -> Any:
+    """
+    Get product by ID.
+    """
+    product = db.query(Product).filter(Product.id == product_id).first()
+    if not product:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Product not found",
+        )
+    
+    if not product.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Product not found",
+        )
+    
+    return product
+
+
+@router.put("/{product_id}", response_model=ProductSchema)
+def update_product(
+    *,
+    db: Session = Depends(get_db),
+    product_id: str,
+    product_in: ProductUpdate,
+    current_user: User = Depends(get_current_active_admin),
+) -> Any:
+    """
+    Update a product. Only admin users can update products.
+    """
+    product = db.query(Product).filter(Product.id == product_id).first()
+    if not product:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Product not found",
+        )
+    
+    update_data = product_in.dict(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(product, field, value)
+    
+    db.add(product)
+    db.commit()
+    db.refresh(product)
+    return product
+
+
+@router.delete("/{product_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def delete_product(
+    *,
+    db: Session = Depends(get_db),
+    product_id: str,
+    current_user: User = Depends(get_current_active_admin),
+) -> Any:
+    """
+    Delete a product. Only admin users can delete products.
+    """
+    product = db.query(Product).filter(Product.id == product_id).first()
+    if not product:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Product not found",
+        )
+    
+    # Soft delete by setting is_active to False
+    product.is_active = False
+    db.add(product)
+    db.commit()
+    
+    return None

app/api/v1/endpoints/users.py

@@ -0,0 +1,106 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.core.security import get_current_user, get_password_hash
+from app.db.session import get_db
+from app.models.user import User
+from app.schemas.user import User as UserSchema
+from app.schemas.user import UserUpdate
+
+router = APIRouter()
+
+
+@router.get("/me", response_model=UserSchema)
+def read_user_me(
+    db: Session = Depends(get_db),
+    current_user_id: str = Depends(get_current_user),
+) -> Any:
+    """
+    Get current user.
+    """
+    user = db.query(User).filter(User.id == current_user_id).first()
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="User not found",
+        )
+    return user
+
+
+@router.put("/me", response_model=UserSchema)
+def update_user_me(
+    *,
+    db: Session = Depends(get_db),
+    current_user_id: str = Depends(get_current_user),
+    user_in: UserUpdate,
+) -> Any:
+    """
+    Update current user.
+    """
+    user = db.query(User).filter(User.id == current_user_id).first()
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="User not found",
+        )
+    
+    update_data = user_in.dict(exclude_unset=True)
+    if "password" in update_data and update_data["password"]:
+        update_data["hashed_password"] = get_password_hash(update_data["password"])
+        del update_data["password"]
+    
+    for field, value in update_data.items():
+        setattr(user, field, value)
+    
+    db.add(user)
+    db.commit()
+    db.refresh(user)
+    return user
+
+
+@router.get("/{user_id}", response_model=UserSchema)
+def read_user_by_id(
+    user_id: str,
+    db: Session = Depends(get_db),
+    current_user_id: str = Depends(get_current_user),
+) -> Any:
+    """
+    Get a specific user by id.
+    """
+    user = db.query(User).filter(User.id == current_user_id).first()
+    if not user or not user.is_admin:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions",
+        )
+    
+    user = db.query(User).filter(User.id == user_id).first()
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="User not found",
+        )
+    return user
+
+
+@router.get("/", response_model=List[UserSchema])
+def read_users(
+    db: Session = Depends(get_db),
+    current_user_id: str = Depends(get_current_user),
+    skip: int = 0,
+    limit: int = 100,
+) -> Any:
+    """
+    Retrieve users. Only admin users can access this endpoint.
+    """
+    user = db.query(User).filter(User.id == current_user_id).first()
+    if not user or not user.is_admin:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions",
+        )
+    
+    users = db.query(User).offset(skip).limit(limit).all()
+    return users

app/core/__init__.py

@@ -0,0 +1 @@
+# This file marks the core directory as a Python package

app/core/config.py

@@ -0,0 +1,38 @@
+import os
+from pathlib import Path
+from typing import List
+
+from pydantic_settings import BaseSettings
+
+class Settings(BaseSettings):
+    # Project settings
+    PROJECT_NAME: str = "E-Commerce API"
+    PROJECT_DESCRIPTION: str = "FastAPI E-Commerce Application"
+    PROJECT_VERSION: str = "0.1.0"
+
+    # API settings
+    API_V1_STR: str = "/api/v1"
+    
+    # JWT Settings
+    JWT_SECRET_KEY: str = os.environ.get("JWT_SECRET_KEY", "supersecretkey")
+    JWT_ALGORITHM: str = "HS256"
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+    
+    # Database settings
+    DB_DIR: Path = Path("/app") / "storage" / "db"
+    SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
+    
+    # CORS settings
+    CORS_ORIGINS: List[str] = ["*"]
+    
+    # Security settings
+    PASSWORD_HASH_ROUNDS: int = 12
+    
+    class Config:
+        env_file = ".env"
+        case_sensitive = True
+
+# Create DB directory if it doesn't exist
+Settings().DB_DIR.mkdir(parents=True, exist_ok=True)
+
+settings = Settings()

app/core/security.py

@@ -0,0 +1,63 @@
+from datetime import datetime, timedelta
+from typing import Any, Optional, Union
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from sqlalchemy.orm import Session
+
+from app.core.config import settings
+from app.db.session import get_db
+
+# Password hashing context
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+# OAuth2 password bearer
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl=f"{settings.API_V1_STR}/auth/login")
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """Verify if plain password matches hashed password."""
+    return pwd_context.verify(plain_password, hashed_password)
+
+def get_password_hash(password: str) -> str:
+    """Hash password."""
+    return pwd_context.hash(password)
+
+def create_access_token(subject: Union[str, Any], expires_delta: Optional[timedelta] = None) -> str:
+    """Create JWT access token."""
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    
+    to_encode = {"exp": expire, "sub": str(subject)}
+    encoded_jwt = jwt.encode(to_encode, settings.JWT_SECRET_KEY, algorithm=settings.JWT_ALGORITHM)
+    return encoded_jwt
+
+async def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)):
+    """Get current user from token."""
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    
+    try:
+        payload = jwt.decode(
+            token, settings.JWT_SECRET_KEY, algorithms=[settings.JWT_ALGORITHM]
+        )
+        user_id: str = payload.get("sub")
+        if user_id is None:
+            raise credentials_exception
+    except JWTError:
+        raise credentials_exception
+    
+    # This will be implemented after we create the User model
+    # user = db.query(User).filter(User.id == user_id).first()
+    # if user is None:
+    #     raise credentials_exception
+    # return user
+    
+    # For now, return the user_id
+    return user_id

app/db/__init__.py

@@ -0,0 +1 @@
+# This file marks the db directory as a Python package

app/db/session.py

@@ -0,0 +1,28 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+from app.core.config import settings
+
+# Create DB directory if it doesn't exist
+settings.DB_DIR.mkdir(parents=True, exist_ok=True)
+
+# Create engine
+engine = create_engine(
+    settings.SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}
+)
+
+# Create SessionLocal
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# Create Base class
+Base = declarative_base()
+
+# Dependency to get DB session
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

app/models/__init__.py

@@ -0,0 +1,15 @@
+# Import all models here
+from app.models.user import User
+from app.models.product import Category, Product
+from app.models.order import Order, OrderItem, OrderStatus
+from app.models.cart import CartItem
+
+__all__ = [
+    "User",
+    "Category",
+    "Product",
+    "Order",
+    "OrderItem",
+    "OrderStatus",
+    "CartItem",
+]

app/models/base.py

@@ -0,0 +1,16 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import Column, DateTime
+from sqlalchemy.dialects.sqlite import TEXT
+from sqlalchemy.ext.declarative import declared_attr
+
+
+class Base:
+    @declared_attr
+    def __tablename__(cls):
+        return cls.__name__.lower()
+    
+    id = Column(TEXT, primary_key=True, default=lambda: str(uuid.uuid4()))
+    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)

app/models/cart.py

@@ -0,0 +1,19 @@
+from sqlalchemy import Column, ForeignKey, Integer, String
+from sqlalchemy.orm import relationship
+
+from app.db.session import Base
+from app.models.base import Base as BaseModel
+
+
+class CartItem(Base, BaseModel):
+    """Cart item model."""
+    
+    quantity = Column(Integer, nullable=False, default=1)
+    
+    # Foreign keys
+    user_id = Column(String(36), ForeignKey("user.id"), nullable=False)
+    product_id = Column(String(36), ForeignKey("product.id"), nullable=False)
+    
+    # Relationships
+    user = relationship("User", back_populates="cart_items")
+    product = relationship("Product", back_populates="cart_items")

app/models/order.py

@@ -0,0 +1,49 @@
+from enum import Enum as PyEnum
+
+from sqlalchemy import Column, Enum, Float, ForeignKey, Integer, String, Text
+from sqlalchemy.orm import relationship
+
+from app.db.session import Base
+from app.models.base import Base as BaseModel
+
+
+class OrderStatus(str, PyEnum):
+    """Order status enum."""
+    
+    PENDING = "pending"
+    PAID = "paid"
+    SHIPPED = "shipped"
+    DELIVERED = "delivered"
+    CANCELLED = "cancelled"
+
+
+class Order(Base, BaseModel):
+    """Order model."""
+    
+    total_amount = Column(Float, nullable=False)
+    status = Column(Enum(OrderStatus), default=OrderStatus.PENDING, nullable=False)
+    shipping_address = Column(Text, nullable=True)
+    tracking_number = Column(String(100), nullable=True)
+    payment_id = Column(String(100), nullable=True)
+    
+    # Foreign keys
+    user_id = Column(String(36), ForeignKey("user.id"), nullable=False)
+    
+    # Relationships
+    user = relationship("User", back_populates="orders")
+    items = relationship("OrderItem", back_populates="order", cascade="all, delete-orphan")
+
+
+class OrderItem(Base, BaseModel):
+    """Order item model."""
+    
+    quantity = Column(Integer, nullable=False)
+    price = Column(Float, nullable=False)  # Price at the time of purchase
+    
+    # Foreign keys
+    order_id = Column(String(36), ForeignKey("order.id"), nullable=False)
+    product_id = Column(String(36), ForeignKey("product.id"), nullable=False)
+    
+    # Relationships
+    order = relationship("Order", back_populates="items")
+    product = relationship("Product", back_populates="order_items")

app/models/product.py

@@ -0,0 +1,34 @@
+from sqlalchemy import Boolean, Column, Float, ForeignKey, Integer, String, Text
+from sqlalchemy.orm import relationship
+
+from app.db.session import Base
+from app.models.base import Base as BaseModel
+
+
+class Category(Base, BaseModel):
+    """Category model."""
+    
+    name = Column(String(100), nullable=False, unique=True)
+    description = Column(Text, nullable=True)
+    
+    # Relationships
+    products = relationship("Product", back_populates="category")
+
+
+class Product(Base, BaseModel):
+    """Product model."""
+    
+    name = Column(String(255), nullable=False, index=True)
+    description = Column(Text, nullable=True)
+    price = Column(Float, nullable=False)
+    stock_quantity = Column(Integer, nullable=False, default=0)
+    is_active = Column(Boolean, default=True)
+    image_url = Column(String(255), nullable=True)
+    
+    # Foreign keys
+    category_id = Column(String(36), ForeignKey("category.id"), nullable=True)
+    
+    # Relationships
+    category = relationship("Category", back_populates="products")
+    order_items = relationship("OrderItem", back_populates="product")
+    cart_items = relationship("CartItem", back_populates="product")

app/models/user.py

@@ -0,0 +1,21 @@
+from sqlalchemy import Boolean, Column, String, Text
+from sqlalchemy.orm import relationship
+
+from app.db.session import Base
+from app.models.base import Base as BaseModel
+
+
+class User(Base, BaseModel):
+    """User model."""
+    
+    email = Column(String(255), unique=True, index=True, nullable=False)
+    hashed_password = Column(String(255), nullable=False)
+    full_name = Column(String(255), nullable=True)
+    phone = Column(String(20), nullable=True)
+    address = Column(Text, nullable=True)
+    is_active = Column(Boolean, default=True)
+    is_admin = Column(Boolean, default=False)
+    
+    # Relationships
+    orders = relationship("Order", back_populates="user", cascade="all, delete-orphan")
+    cart_items = relationship("CartItem", back_populates="user", cascade="all, delete-orphan")

app/schemas/__init__.py

@@ -0,0 +1,29 @@
+# Import all schemas here for easier access
+from app.schemas.user import User, UserCreate, UserUpdate
+from app.schemas.product import Category, CategoryCreate, CategoryUpdate, Product, ProductCreate, ProductUpdate
+from app.schemas.order import Order, OrderCreate, OrderItem, OrderItemCreate, OrderUpdate
+from app.schemas.cart import Cart, CartItem, CartItemCreate, CartItemUpdate
+from app.schemas.token import Token, TokenPayload
+
+__all__ = [
+    "User",
+    "UserCreate",
+    "UserUpdate",
+    "Category",
+    "CategoryCreate",
+    "CategoryUpdate",
+    "Product",
+    "ProductCreate",
+    "ProductUpdate",
+    "Order",
+    "OrderCreate",
+    "OrderItem",
+    "OrderItemCreate",
+    "OrderUpdate",
+    "Cart",
+    "CartItem",
+    "CartItemCreate",
+    "CartItemUpdate",
+    "Token",
+    "TokenPayload",
+]

app/schemas/cart.py

@@ -0,0 +1,35 @@
+from typing import List, Optional
+
+from pydantic import BaseModel, Field
+
+from app.schemas.product import Product
+
+
+class CartItemBase(BaseModel):
+    product_id: str
+    quantity: int = Field(..., gt=0)
+
+
+class CartItemCreate(CartItemBase):
+    pass
+
+
+class CartItemUpdate(BaseModel):
+    quantity: int = Field(..., gt=0)
+
+
+class CartItem(CartItemBase):
+    id: str
+    user_id: str
+    product: Optional[Product] = None
+    
+    class Config:
+        orm_mode = True
+
+
+class Cart(BaseModel):
+    items: List[CartItem] = []
+    total: float = 0
+    
+    class Config:
+        orm_mode = True

app/schemas/order.py

@@ -0,0 +1,53 @@
+from datetime import datetime
+from typing import List, Optional
+
+from pydantic import BaseModel, Field
+
+from app.models.order import OrderStatus
+
+
+# OrderItem schemas
+class OrderItemBase(BaseModel):
+    product_id: str
+    quantity: int = Field(..., gt=0)
+    price: float = Field(..., gt=0)
+
+
+class OrderItemCreate(OrderItemBase):
+    pass
+
+
+class OrderItem(OrderItemBase):
+    id: str
+    order_id: str
+    
+    class Config:
+        orm_mode = True
+
+
+# Order schemas
+class OrderBase(BaseModel):
+    shipping_address: Optional[str] = None
+    tracking_number: Optional[str] = None
+    payment_id: Optional[str] = None
+    status: OrderStatus = OrderStatus.PENDING
+
+
+class OrderCreate(OrderBase):
+    items: List[OrderItemCreate]
+
+
+class OrderUpdate(OrderBase):
+    pass
+
+
+class Order(OrderBase):
+    id: str
+    user_id: str
+    total_amount: float
+    created_at: datetime
+    updated_at: datetime
+    items: List[OrderItem] = []
+    
+    class Config:
+        orm_mode = True

app/schemas/product.py

@@ -0,0 +1,53 @@
+from typing import Optional
+
+from pydantic import BaseModel, Field
+
+
+# Category schemas
+class CategoryBase(BaseModel):
+    name: str
+    description: Optional[str] = None
+
+
+class CategoryCreate(CategoryBase):
+    pass
+
+
+class CategoryUpdate(CategoryBase):
+    name: Optional[str] = None
+
+
+class Category(CategoryBase):
+    id: str
+    
+    class Config:
+        orm_mode = True
+
+
+# Product schemas
+class ProductBase(BaseModel):
+    name: str
+    description: Optional[str] = None
+    price: float = Field(..., gt=0)
+    stock_quantity: int = Field(..., ge=0)
+    is_active: bool = True
+    image_url: Optional[str] = None
+    category_id: Optional[str] = None
+
+
+class ProductCreate(ProductBase):
+    pass
+
+
+class ProductUpdate(ProductBase):
+    name: Optional[str] = None
+    price: Optional[float] = Field(None, gt=0)
+    stock_quantity: Optional[int] = Field(None, ge=0)
+
+
+class Product(ProductBase):
+    id: str
+    category: Optional[Category] = None
+    
+    class Config:
+        orm_mode = True

app/schemas/token.py

@@ -0,0 +1,12 @@
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+
+class TokenPayload(BaseModel):
+    sub: Optional[str] = None

app/schemas/user.py

@@ -0,0 +1,39 @@
+from typing import Optional
+
+from pydantic import BaseModel, EmailStr, Field, validator
+
+
+# Shared properties
+class UserBase(BaseModel):
+    email: EmailStr
+    full_name: Optional[str] = None
+    phone: Optional[str] = None
+    address: Optional[str] = None
+    is_active: bool = True
+    is_admin: bool = False
+
+
+# Properties to receive via API on creation
+class UserCreate(UserBase):
+    password: str = Field(..., min_length=8)
+    password_confirm: str
+
+    @validator('password_confirm')
+    def passwords_match(cls, v, values, **kwargs):
+        if 'password' in values and v != values['password']:
+            raise ValueError('passwords do not match')
+        return v
+
+
+# Properties to receive via API on update
+class UserUpdate(UserBase):
+    email: Optional[EmailStr] = None
+    password: Optional[str] = Field(None, min_length=8)
+
+
+# Properties to return via API
+class User(UserBase):
+    id: str
+    
+    class Config:
+        orm_mode = True

app/services/__init__.py

@@ -0,0 +1 @@
+# This file marks the services directory as a Python package

app/utils/__init__.py

@@ -0,0 +1 @@
+# This file marks the utils directory as a Python package

main.py

@@ -0,0 +1,35 @@
+import uvicorn
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.api.v1.api import api_router
+from app.core.config import settings
+
+app = FastAPI(
+    title=settings.PROJECT_NAME,
+    description=settings.PROJECT_DESCRIPTION,
+    version=settings.PROJECT_VERSION,
+    openapi_url="/openapi.json",
+    docs_url="/docs",
+    redoc_url="/redoc",
+)
+
+# Set up CORS
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include API router
+app.include_router(api_router)
+
+# Root health check endpoint
+@app.get("/health", tags=["health"])
+async def health_check():
+    return {"status": "healthy"}
+
+if __name__ == "__main__":
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)

migrations/README

@@ -0,0 +1 @@
+Generic single-database configuration with SQLite.

migrations/__init__.py

@@ -0,0 +1 @@
+# This file marks the migrations directory as a Python package

migrations/env.py

@@ -0,0 +1,80 @@
+import os
+import sys
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+# Add the parent directory to sys.path
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
+
+# Import Base and all models
+from app.db.session import Base
+from app.models import *  # noqa
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+target_metadata = Base.metadata
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        is_sqlite = connection.dialect.name == 'sqlite'
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            render_as_batch=is_sqlite,  # Key configuration for SQLite
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

migrations/script.py.mako

@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

migrations/versions/0001_create_tables.py

@@ -0,0 +1,114 @@
+"""create tables
+
+Revision ID: 0001
+Revises: 
+Create Date: 2023-08-31 10:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '0001'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # Create user table
+    op.create_table('user',
+        sa.Column('id', sa.Text(), nullable=False),
+        sa.Column('created_at', sa.DateTime(), nullable=False),
+        sa.Column('updated_at', sa.DateTime(), nullable=False),
+        sa.Column('email', sa.String(length=255), nullable=False),
+        sa.Column('hashed_password', sa.String(length=255), nullable=False),
+        sa.Column('full_name', sa.String(length=255), nullable=True),
+        sa.Column('phone', sa.String(length=20), nullable=True),
+        sa.Column('address', sa.Text(), nullable=True),
+        sa.Column('is_active', sa.Boolean(), nullable=True),
+        sa.Column('is_admin', sa.Boolean(), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_user_email'), 'user', ['email'], unique=True)
+    
+    # Create category table
+    op.create_table('category',
+        sa.Column('id', sa.Text(), nullable=False),
+        sa.Column('created_at', sa.DateTime(), nullable=False),
+        sa.Column('updated_at', sa.DateTime(), nullable=False),
+        sa.Column('name', sa.String(length=100), nullable=False),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.PrimaryKeyConstraint('id'),
+        sa.UniqueConstraint('name')
+    )
+    
+    # Create product table
+    op.create_table('product',
+        sa.Column('id', sa.Text(), nullable=False),
+        sa.Column('created_at', sa.DateTime(), nullable=False),
+        sa.Column('updated_at', sa.DateTime(), nullable=False),
+        sa.Column('name', sa.String(length=255), nullable=False),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column('price', sa.Float(), nullable=False),
+        sa.Column('stock_quantity', sa.Integer(), nullable=False),
+        sa.Column('is_active', sa.Boolean(), nullable=True),
+        sa.Column('image_url', sa.String(length=255), nullable=True),
+        sa.Column('category_id', sa.String(length=36), nullable=True),
+        sa.ForeignKeyConstraint(['category_id'], ['category.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_product_name'), 'product', ['name'], unique=False)
+    
+    # Create order table
+    op.create_table('order',
+        sa.Column('id', sa.Text(), nullable=False),
+        sa.Column('created_at', sa.DateTime(), nullable=False),
+        sa.Column('updated_at', sa.DateTime(), nullable=False),
+        sa.Column('total_amount', sa.Float(), nullable=False),
+        sa.Column('status', sa.Enum('pending', 'paid', 'shipped', 'delivered', 'cancelled', name='orderstatus'), nullable=False),
+        sa.Column('shipping_address', sa.Text(), nullable=True),
+        sa.Column('tracking_number', sa.String(length=100), nullable=True),
+        sa.Column('payment_id', sa.String(length=100), nullable=True),
+        sa.Column('user_id', sa.String(length=36), nullable=False),
+        sa.ForeignKeyConstraint(['user_id'], ['user.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    
+    # Create order_item table
+    op.create_table('order_item',
+        sa.Column('id', sa.Text(), nullable=False),
+        sa.Column('created_at', sa.DateTime(), nullable=False),
+        sa.Column('updated_at', sa.DateTime(), nullable=False),
+        sa.Column('quantity', sa.Integer(), nullable=False),
+        sa.Column('price', sa.Float(), nullable=False),
+        sa.Column('order_id', sa.String(length=36), nullable=False),
+        sa.Column('product_id', sa.String(length=36), nullable=False),
+        sa.ForeignKeyConstraint(['order_id'], ['order.id'], ),
+        sa.ForeignKeyConstraint(['product_id'], ['product.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    
+    # Create cart_item table
+    op.create_table('cart_item',
+        sa.Column('id', sa.Text(), nullable=False),
+        sa.Column('created_at', sa.DateTime(), nullable=False),
+        sa.Column('updated_at', sa.DateTime(), nullable=False),
+        sa.Column('quantity', sa.Integer(), nullable=False),
+        sa.Column('user_id', sa.String(length=36), nullable=False),
+        sa.Column('product_id', sa.String(length=36), nullable=False),
+        sa.ForeignKeyConstraint(['product_id'], ['product.id'], ),
+        sa.ForeignKeyConstraint(['user_id'], ['user.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+
+
+def downgrade():
+    op.drop_table('cart_item')
+    op.drop_table('order_item')
+    op.drop_table('order')
+    op.drop_table('product')
+    op.drop_table('category')
+    op.drop_table('user')
+    op.execute('DROP TYPE orderstatus')

migrations/versions/__init__.py

@@ -0,0 +1 @@
+# This file marks the versions directory as a Python package

requirements.txt

@@ -0,0 +1,13 @@
+fastapi>=0.103.1
+uvicorn>=0.23.2
+sqlalchemy>=2.0.20
+alembic>=1.12.0
+pydantic>=2.3.0
+pydantic-settings>=2.0.3
+python-jose>=3.3.0
+passlib>=1.7.4
+bcrypt>=4.0.1
+python-multipart>=0.0.6
+email-validator>=2.0.0
+ruff>=0.0.291
+python-dotenv>=1.0.0