Implement complete bookstore management API with FastAPI

- Added comprehensive book management with CRUD operations
- Implemented inventory tracking with stock management and reservations
- Created order management system with status tracking
- Integrated Stripe payment processing with payment intents
- Added SQLite database with SQLAlchemy ORM and Alembic migrations
- Implemented health check and API documentation endpoints
- Added comprehensive error handling and validation
- Configured CORS middleware for frontend integration

README.md

@@ -1,3 +1,124 @@
-# FastAPI Application
+# Bookstore Management API
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A comprehensive REST API for managing a bookstore with inventory management and Stripe payment processing built with FastAPI.
+
+## Features
+
+- **Book Management**: Complete CRUD operations for books with search and filtering
+- **Inventory Management**: Track stock levels, reserve items, and manage restocking
+- **Order Management**: Handle customer orders with status tracking
+- **Payment Processing**: Secure payment handling with Stripe integration
+- **Database**: SQLite database with SQLAlchemy ORM and Alembic migrations
+
+## API Endpoints
+
+### Books
+- `GET /api/v1/books/` - List all books with filtering options
+- `POST /api/v1/books/` - Create a new book
+- `GET /api/v1/books/{book_id}` - Get a specific book
+- `PUT /api/v1/books/{book_id}` - Update a book
+- `DELETE /api/v1/books/{book_id}` - Deactivate a book
+
+### Inventory
+- `GET /api/v1/inventory/` - List inventory items
+- `POST /api/v1/inventory/` - Create inventory entry
+- `GET /api/v1/inventory/{inventory_id}` - Get inventory item
+- `GET /api/v1/inventory/book/{book_id}` - Get inventory by book
+- `PUT /api/v1/inventory/{inventory_id}` - Update inventory
+- `POST /api/v1/inventory/{inventory_id}/restock` - Restock items
+- `POST /api/v1/inventory/{inventory_id}/reserve` - Reserve items
+- `POST /api/v1/inventory/{inventory_id}/release` - Release reserved items
+
+### Orders
+- `GET /api/v1/orders/` - List orders with filtering
+- `POST /api/v1/orders/` - Create a new order
+- `GET /api/v1/orders/{order_id}` - Get order details
+- `PUT /api/v1/orders/{order_id}/status` - Update order status
+- `POST /api/v1/orders/payment-intent` - Create Stripe payment intent
+- `POST /api/v1/orders/{order_id}/confirm-payment` - Confirm payment
+- `DELETE /api/v1/orders/{order_id}` - Cancel order
+
+### System
+- `GET /` - API information
+- `GET /health` - Health check endpoint
+- `GET /docs` - Interactive API documentation
+- `GET /redoc` - ReDoc API documentation
+
+## Installation & Setup
+
+1. Install dependencies:
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+2. Set up environment variables:
+   ```bash
+   export STRIPE_SECRET_KEY=your_stripe_secret_key_here
+   ```
+
+3. Run database migrations:
+   ```bash
+   alembic upgrade head
+   ```
+
+4. Start the application:
+   ```bash
+   uvicorn main:app --reload --host 0.0.0.0 --port 8000
+   ```
+
+## Environment Variables
+
+The following environment variables need to be set:
+
+- `STRIPE_SECRET_KEY`: Your Stripe secret key for payment processing
+
+## Database
+
+The application uses SQLite with the database file located at `/app/storage/db/db.sqlite`. The database schema includes:
+
+- **books**: Book catalog with details
+- **inventory**: Stock management for books
+- **orders**: Customer orders
+- **order_items**: Items within orders
+
+## Development
+
+### Linting
+Run code linting with:
+```bash
+ruff check --fix .
+```
+
+### Database Migrations
+Create new migrations:
+```bash
+alembic revision --autogenerate -m "Description"
+```
+
+Apply migrations:
+```bash
+alembic upgrade head
+```
+
+## API Documentation
+
+Once the server is running, visit:
+- http://localhost:8000/docs for Swagger UI
+- http://localhost:8000/redoc for ReDoc
+- http://localhost:8000/openapi.json for OpenAPI schema
+
+## Payment Flow
+
+1. Create an order with items
+2. Create a payment intent for the order
+3. Process the payment on the frontend using Stripe
+4. Confirm the payment to update order status
+5. Manage order fulfillment through status updates
+
+## Error Handling
+
+The API provides comprehensive error handling with appropriate HTTP status codes and descriptive error messages for various scenarios including:
+- Invalid data validation
+- Insufficient inventory
+- Payment processing errors
+- Resource not found

alembic.ini

@@ -0,0 +1,41 @@
+[alembic]
+script_location = alembic
+prepend_sys_path = .
+version_path_separator = os
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+[post_write_hooks]
+
+[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

alembic/env.py

@@ -0,0 +1,49 @@
+from logging.config import fileConfig
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+from alembic import context
+import sys
+import os
+
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from app.db.base import Base
+
+config = context.config
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+def run_migrations_offline() -> None:
+    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() -> None:
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection, target_metadata=target_metadata
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

alembic/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() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

alembic/versions/001_initial_migration.py

@@ -0,0 +1,92 @@
+"""Initial migration
+
+Revision ID: 001
+Revises: 
+Create Date: 2024-01-01 12:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = '001'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+def upgrade() -> None:
+    # Create books table
+    op.create_table('books',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('title', sa.String(length=255), nullable=False),
+    sa.Column('author', sa.String(length=255), nullable=False),
+    sa.Column('isbn', sa.String(length=13), nullable=False),
+    sa.Column('description', sa.Text(), nullable=True),
+    sa.Column('price', sa.Float(), nullable=False),
+    sa.Column('category', sa.String(length=100), nullable=False),
+    sa.Column('publisher', sa.String(length=255), nullable=True),
+    sa.Column('publication_date', sa.DateTime(), nullable=True),
+    sa.Column('pages', sa.Integer(), nullable=True),
+    sa.Column('language', sa.String(length=50), nullable=True),
+    sa.Column('is_active', sa.Boolean(), nullable=True),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+    sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_books_id'), 'books', ['id'], unique=False)
+    op.create_index(op.f('ix_books_isbn'), 'books', ['isbn'], unique=True)
+    op.create_index(op.f('ix_books_title'), 'books', ['title'], unique=False)
+
+    # Create inventory table
+    op.create_table('inventory',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('book_id', sa.Integer(), nullable=False),
+    sa.Column('quantity', sa.Integer(), nullable=False),
+    sa.Column('reserved_quantity', sa.Integer(), nullable=False),
+    sa.Column('reorder_level', sa.Integer(), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+    sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+    sa.ForeignKeyConstraint(['book_id'], ['books.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_inventory_id'), 'inventory', ['id'], unique=False)
+
+    # Create orders table
+    op.create_table('orders',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('customer_email', sa.String(length=255), nullable=False),
+    sa.Column('customer_name', sa.String(length=255), nullable=False),
+    sa.Column('customer_address', sa.Text(), nullable=False),
+    sa.Column('total_amount', sa.Float(), nullable=False),
+    sa.Column('status', sa.Enum('PENDING', 'CONFIRMED', 'SHIPPED', 'DELIVERED', 'CANCELLED', name='orderstatus'), nullable=True),
+    sa.Column('stripe_payment_intent_id', sa.String(length=255), nullable=True),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+    sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_orders_id'), 'orders', ['id'], unique=False)
+
+    # Create order_items table
+    op.create_table('order_items',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('order_id', sa.Integer(), nullable=False),
+    sa.Column('book_id', sa.Integer(), nullable=False),
+    sa.Column('quantity', sa.Integer(), nullable=False),
+    sa.Column('price', sa.Float(), nullable=False),
+    sa.ForeignKeyConstraint(['book_id'], ['books.id'], ),
+    sa.ForeignKeyConstraint(['order_id'], ['orders.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_order_items_id'), 'order_items', ['id'], unique=False)
+
+def downgrade() -> None:
+    op.drop_index(op.f('ix_order_items_id'), table_name='order_items')
+    op.drop_table('order_items')
+    op.drop_index(op.f('ix_orders_id'), table_name='orders')
+    op.drop_table('orders')
+    op.drop_index(op.f('ix_inventory_id'), table_name='inventory')
+    op.drop_table('inventory')
+    op.drop_index(op.f('ix_books_title'), table_name='books')
+    op.drop_index(op.f('ix_books_isbn'), table_name='books')
+    op.drop_index(op.f('ix_books_id'), table_name='books')
+    op.drop_table('books')

app/api/books.py

@@ -0,0 +1,85 @@
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.orm import Session
+from typing import List, Optional
+from app.db.session import get_db
+from app.models import Book, Inventory
+from app.schemas import BookCreate, BookUpdate, BookResponse
+
+router = APIRouter(prefix="/books", tags=["books"])
+
+@router.post("/", response_model=BookResponse)
+def create_book(book: BookCreate, db: Session = Depends(get_db)):
+    db_book = db.query(Book).filter(Book.isbn == book.isbn).first()
+    if db_book:
+        raise HTTPException(status_code=400, detail="Book with this ISBN already exists")
+    
+    db_book = Book(**book.model_dump())
+    db.add(db_book)
+    db.commit()
+    db.refresh(db_book)
+    
+    inventory = Inventory(book_id=db_book.id, quantity=0)
+    db.add(inventory)
+    db.commit()
+    
+    return db_book
+
+@router.get("/", response_model=List[BookResponse])
+def get_books(
+    skip: int = Query(0, ge=0),
+    limit: int = Query(100, ge=1, le=1000),
+    category: Optional[str] = None,
+    author: Optional[str] = None,
+    search: Optional[str] = None,
+    db: Session = Depends(get_db)
+):
+    query = db.query(Book).filter(Book.is_active)
+    
+    if category:
+        query = query.filter(Book.category.ilike(f"%{category}%"))
+    if author:
+        query = query.filter(Book.author.ilike(f"%{author}%"))
+    if search:
+        query = query.filter(
+            (Book.title.ilike(f"%{search}%")) |
+            (Book.author.ilike(f"%{search}%")) |
+            (Book.description.ilike(f"%{search}%"))
+        )
+    
+    return query.offset(skip).limit(limit).all()
+
+@router.get("/{book_id}", response_model=BookResponse)
+def get_book(book_id: int, db: Session = Depends(get_db)):
+    book = db.query(Book).filter(Book.id == book_id, Book.is_active).first()
+    if not book:
+        raise HTTPException(status_code=404, detail="Book not found")
+    return book
+
+@router.put("/{book_id}", response_model=BookResponse)
+def update_book(book_id: int, book_update: BookUpdate, db: Session = Depends(get_db)):
+    book = db.query(Book).filter(Book.id == book_id).first()
+    if not book:
+        raise HTTPException(status_code=404, detail="Book not found")
+    
+    update_data = book_update.model_dump(exclude_unset=True)
+    if "isbn" in update_data:
+        existing_book = db.query(Book).filter(Book.isbn == update_data["isbn"], Book.id != book_id).first()
+        if existing_book:
+            raise HTTPException(status_code=400, detail="Book with this ISBN already exists")
+    
+    for field, value in update_data.items():
+        setattr(book, field, value)
+    
+    db.commit()
+    db.refresh(book)
+    return book
+
+@router.delete("/{book_id}")
+def delete_book(book_id: int, db: Session = Depends(get_db)):
+    book = db.query(Book).filter(Book.id == book_id).first()
+    if not book:
+        raise HTTPException(status_code=404, detail="Book not found")
+    
+    book.is_active = False
+    db.commit()
+    return {"message": "Book deactivated successfully"}

app/api/inventory.py

@@ -0,0 +1,119 @@
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.orm import Session
+from typing import List
+from app.db.session import get_db
+from app.models import Inventory, Book
+from app.schemas import InventoryCreate, InventoryUpdate, InventoryResponse
+
+router = APIRouter(prefix="/inventory", tags=["inventory"])
+
+@router.post("/", response_model=InventoryResponse)
+def create_inventory(inventory: InventoryCreate, db: Session = Depends(get_db)):
+    book = db.query(Book).filter(Book.id == inventory.book_id).first()
+    if not book:
+        raise HTTPException(status_code=404, detail="Book not found")
+    
+    existing_inventory = db.query(Inventory).filter(Inventory.book_id == inventory.book_id).first()
+    if existing_inventory:
+        raise HTTPException(status_code=400, detail="Inventory for this book already exists")
+    
+    db_inventory = Inventory(**inventory.model_dump())
+    db.add(db_inventory)
+    db.commit()
+    db.refresh(db_inventory)
+    
+    setattr(db_inventory, 'available_quantity', db_inventory.quantity - db_inventory.reserved_quantity)
+    return db_inventory
+
+@router.get("/", response_model=List[InventoryResponse])
+def get_inventory(
+    skip: int = Query(0, ge=0),
+    limit: int = Query(100, ge=1, le=1000),
+    low_stock: bool = Query(False, description="Filter items with low stock"),
+    db: Session = Depends(get_db)
+):
+    query = db.query(Inventory)
+    
+    if low_stock:
+        query = query.filter(Inventory.quantity <= Inventory.reorder_level)
+    
+    inventories = query.offset(skip).limit(limit).all()
+    
+    for inventory in inventories:
+        setattr(inventory, 'available_quantity', inventory.quantity - inventory.reserved_quantity)
+    
+    return inventories
+
+@router.get("/{inventory_id}", response_model=InventoryResponse)
+def get_inventory_item(inventory_id: int, db: Session = Depends(get_db)):
+    inventory = db.query(Inventory).filter(Inventory.id == inventory_id).first()
+    if not inventory:
+        raise HTTPException(status_code=404, detail="Inventory item not found")
+    
+    setattr(inventory, 'available_quantity', inventory.quantity - inventory.reserved_quantity)
+    return inventory
+
+@router.get("/book/{book_id}", response_model=InventoryResponse)
+def get_inventory_by_book(book_id: int, db: Session = Depends(get_db)):
+    inventory = db.query(Inventory).filter(Inventory.book_id == book_id).first()
+    if not inventory:
+        raise HTTPException(status_code=404, detail="Inventory for this book not found")
+    
+    setattr(inventory, 'available_quantity', inventory.quantity - inventory.reserved_quantity)
+    return inventory
+
+@router.put("/{inventory_id}", response_model=InventoryResponse)
+def update_inventory(inventory_id: int, inventory_update: InventoryUpdate, db: Session = Depends(get_db)):
+    inventory = db.query(Inventory).filter(Inventory.id == inventory_id).first()
+    if not inventory:
+        raise HTTPException(status_code=404, detail="Inventory item not found")
+    
+    update_data = inventory_update.model_dump(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(inventory, field, value)
+    
+    db.commit()
+    db.refresh(inventory)
+    
+    setattr(inventory, 'available_quantity', inventory.quantity - inventory.reserved_quantity)
+    return inventory
+
+@router.post("/{inventory_id}/restock")
+def restock_inventory(inventory_id: int, quantity: int = Query(..., gt=0), db: Session = Depends(get_db)):
+    inventory = db.query(Inventory).filter(Inventory.id == inventory_id).first()
+    if not inventory:
+        raise HTTPException(status_code=404, detail="Inventory item not found")
+    
+    inventory.quantity += quantity
+    db.commit()
+    
+    return {"message": f"Restocked {quantity} units. New quantity: {inventory.quantity}"}
+
+@router.post("/{inventory_id}/reserve")
+def reserve_inventory(inventory_id: int, quantity: int = Query(..., gt=0), db: Session = Depends(get_db)):
+    inventory = db.query(Inventory).filter(Inventory.id == inventory_id).first()
+    if not inventory:
+        raise HTTPException(status_code=404, detail="Inventory item not found")
+    
+    available = inventory.quantity - inventory.reserved_quantity
+    if quantity > available:
+        raise HTTPException(status_code=400, detail=f"Not enough stock available. Available: {available}")
+    
+    inventory.reserved_quantity += quantity
+    db.commit()
+    
+    return {"message": f"Reserved {quantity} units"}
+
+@router.post("/{inventory_id}/release")
+def release_inventory(inventory_id: int, quantity: int = Query(..., gt=0), db: Session = Depends(get_db)):
+    inventory = db.query(Inventory).filter(Inventory.id == inventory_id).first()
+    if not inventory:
+        raise HTTPException(status_code=404, detail="Inventory item not found")
+    
+    if quantity > inventory.reserved_quantity:
+        raise HTTPException(status_code=400, detail="Cannot release more than reserved quantity")
+    
+    inventory.reserved_quantity -= quantity
+    db.commit()
+    
+    return {"message": f"Released {quantity} units from reservation"}

app/api/orders.py

@@ -0,0 +1,177 @@
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.orm import Session
+from typing import List, Optional
+from app.db.session import get_db
+from app.models import Order, OrderItem, Book, Inventory, OrderStatus
+from app.schemas import OrderCreate, OrderResponse, PaymentIntentCreate
+from app.services.stripe_service import StripeService
+
+router = APIRouter(prefix="/orders", tags=["orders"])
+
+@router.post("/", response_model=OrderResponse)
+def create_order(order: OrderCreate, db: Session = Depends(get_db)):
+    total_amount = 0
+    order_items_data = []
+    
+    for item in order.items:
+        book = db.query(Book).filter(Book.id == item.book_id, Book.is_active).first()
+        if not book:
+            raise HTTPException(status_code=404, detail=f"Book with ID {item.book_id} not found")
+        
+        inventory = db.query(Inventory).filter(Inventory.book_id == item.book_id).first()
+        if not inventory:
+            raise HTTPException(status_code=400, detail=f"No inventory found for book ID {item.book_id}")
+        
+        available = inventory.quantity - inventory.reserved_quantity
+        if item.quantity > available:
+            raise HTTPException(status_code=400, detail=f"Not enough stock for book '{book.title}'. Available: {available}")
+        
+        item_total = book.price * item.quantity
+        total_amount += item_total
+        
+        order_items_data.append({
+            "book_id": item.book_id,
+            "quantity": item.quantity,
+            "price": book.price
+        })
+    
+    db_order = Order(
+        customer_email=order.customer_email,
+        customer_name=order.customer_name,
+        customer_address=order.customer_address,
+        total_amount=total_amount
+    )
+    db.add(db_order)
+    db.commit()
+    db.refresh(db_order)
+    
+    for item_data in order_items_data:
+        order_item = OrderItem(order_id=db_order.id, **item_data)
+        db.add(order_item)
+        
+        inventory = db.query(Inventory).filter(Inventory.book_id == item_data["book_id"]).first()
+        inventory.reserved_quantity += item_data["quantity"]
+    
+    db.commit()
+    db.refresh(db_order)
+    
+    return db_order
+
+@router.get("/", response_model=List[OrderResponse])
+def get_orders(
+    skip: int = Query(0, ge=0),
+    limit: int = Query(100, ge=1, le=1000),
+    status: Optional[OrderStatus] = None,
+    customer_email: Optional[str] = None,
+    db: Session = Depends(get_db)
+):
+    query = db.query(Order)
+    
+    if status:
+        query = query.filter(Order.status == status)
+    if customer_email:
+        query = query.filter(Order.customer_email.ilike(f"%{customer_email}%"))
+    
+    return query.offset(skip).limit(limit).all()
+
+@router.get("/{order_id}", response_model=OrderResponse)
+def get_order(order_id: int, db: Session = Depends(get_db)):
+    order = db.query(Order).filter(Order.id == order_id).first()
+    if not order:
+        raise HTTPException(status_code=404, detail="Order not found")
+    return order
+
+@router.put("/{order_id}/status")
+def update_order_status(order_id: int, status: OrderStatus, db: Session = Depends(get_db)):
+    order = db.query(Order).filter(Order.id == order_id).first()
+    if not order:
+        raise HTTPException(status_code=404, detail="Order not found")
+    
+    if order.status == OrderStatus.CANCELLED:
+        raise HTTPException(status_code=400, detail="Cannot update status of cancelled order")
+    
+    if status == OrderStatus.CANCELLED:
+        for item in order.items:
+            inventory = db.query(Inventory).filter(Inventory.book_id == item.book_id).first()
+            if inventory:
+                inventory.reserved_quantity -= item.quantity
+    
+    if status == OrderStatus.DELIVERED and order.status != OrderStatus.SHIPPED:
+        raise HTTPException(status_code=400, detail="Order must be shipped before it can be delivered")
+    
+    if status == OrderStatus.CONFIRMED and order.status == OrderStatus.PENDING:
+        for item in order.items:
+            inventory = db.query(Inventory).filter(Inventory.book_id == item.book_id).first()
+            if inventory:
+                inventory.quantity -= item.quantity
+                inventory.reserved_quantity -= item.quantity
+    
+    order.status = status
+    db.commit()
+    
+    return {"message": f"Order status updated to {status.value}"}
+
+@router.post("/payment-intent", response_model=dict)
+def create_payment_intent(payment_data: PaymentIntentCreate, db: Session = Depends(get_db)):
+    order = db.query(Order).filter(Order.id == payment_data.order_id).first()
+    if not order:
+        raise HTTPException(status_code=404, detail="Order not found")
+    
+    if order.stripe_payment_intent_id:
+        raise HTTPException(status_code=400, detail="Payment intent already exists for this order")
+    
+    stripe_service = StripeService()
+    payment_intent = stripe_service.create_payment_intent(
+        amount=order.total_amount,
+        metadata={"order_id": str(order.id)}
+    )
+    
+    order.stripe_payment_intent_id = payment_intent["payment_intent_id"]
+    db.commit()
+    
+    return payment_intent
+
+@router.post("/{order_id}/confirm-payment")
+def confirm_payment(order_id: int, db: Session = Depends(get_db)):
+    order = db.query(Order).filter(Order.id == order_id).first()
+    if not order:
+        raise HTTPException(status_code=404, detail="Order not found")
+    
+    if not order.stripe_payment_intent_id:
+        raise HTTPException(status_code=400, detail="No payment intent found for this order")
+    
+    stripe_service = StripeService()
+    payment_status = stripe_service.confirm_payment_intent(order.stripe_payment_intent_id)
+    
+    if payment_status["status"] == "succeeded":
+        order.status = OrderStatus.CONFIRMED
+        db.commit()
+        return {"message": "Payment confirmed and order updated"}
+    else:
+        return {"message": "Payment not yet completed", "status": payment_status["status"]}
+
+@router.delete("/{order_id}")
+def cancel_order(order_id: int, db: Session = Depends(get_db)):
+    order = db.query(Order).filter(Order.id == order_id).first()
+    if not order:
+        raise HTTPException(status_code=404, detail="Order not found")
+    
+    if order.status in [OrderStatus.SHIPPED, OrderStatus.DELIVERED]:
+        raise HTTPException(status_code=400, detail="Cannot cancel shipped or delivered order")
+    
+    for item in order.items:
+        inventory = db.query(Inventory).filter(Inventory.book_id == item.book_id).first()
+        if inventory:
+            inventory.reserved_quantity -= item.quantity
+    
+    if order.stripe_payment_intent_id:
+        stripe_service = StripeService()
+        try:
+            stripe_service.cancel_payment_intent(order.stripe_payment_intent_id)
+        except HTTPException:
+            pass
+    
+    order.status = OrderStatus.CANCELLED
+    db.commit()
+    
+    return {"message": "Order cancelled successfully"}

app/db/base.py

@@ -0,0 +1,3 @@
+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()

app/db/session.py

@@ -0,0 +1,22 @@
+from pathlib import Path
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+DB_DIR = Path("/app") / "storage" / "db"
+DB_DIR.mkdir(parents=True, exist_ok=True)
+
+SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_DIR}/db.sqlite"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

app/models/__init__.py

@@ -0,0 +1,5 @@
+from .book import Book
+from .inventory import Inventory
+from .order import Order, OrderItem, OrderStatus
+
+__all__ = ["Book", "Inventory", "Order", "OrderItem", "OrderStatus"]

app/models/book.py

@@ -0,0 +1,21 @@
+from sqlalchemy import Column, Integer, String, Float, Text, DateTime, Boolean
+from sqlalchemy.sql import func
+from app.db.base import Base
+
+class Book(Base):
+    __tablename__ = "books"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String(255), nullable=False, index=True)
+    author = Column(String(255), nullable=False)
+    isbn = Column(String(13), unique=True, nullable=False, index=True)
+    description = Column(Text, nullable=True)
+    price = Column(Float, nullable=False)
+    category = Column(String(100), nullable=False)
+    publisher = Column(String(255), nullable=True)
+    publication_date = Column(DateTime, nullable=True)
+    pages = Column(Integer, nullable=True)
+    language = Column(String(50), default="English")
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())

app/models/inventory.py

@@ -0,0 +1,17 @@
+from sqlalchemy import Column, Integer, ForeignKey, DateTime
+from sqlalchemy.sql import func
+from sqlalchemy.orm import relationship
+from app.db.base import Base
+
+class Inventory(Base):
+    __tablename__ = "inventory"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    book_id = Column(Integer, ForeignKey("books.id"), nullable=False)
+    quantity = Column(Integer, nullable=False, default=0)
+    reserved_quantity = Column(Integer, nullable=False, default=0)
+    reorder_level = Column(Integer, nullable=False, default=10)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+    
+    book = relationship("Book", backref="inventory")

app/models/order.py

@@ -0,0 +1,37 @@
+from sqlalchemy import Column, Integer, String, Float, DateTime, Enum, ForeignKey, Text
+from sqlalchemy.sql import func
+from sqlalchemy.orm import relationship
+import enum
+from app.db.base import Base
+
+class OrderStatus(enum.Enum):
+    PENDING = "pending"
+    CONFIRMED = "confirmed"
+    SHIPPED = "shipped"
+    DELIVERED = "delivered"
+    CANCELLED = "cancelled"
+
+class Order(Base):
+    __tablename__ = "orders"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    customer_email = Column(String(255), nullable=False)
+    customer_name = Column(String(255), nullable=False)
+    customer_address = Column(Text, nullable=False)
+    total_amount = Column(Float, nullable=False)
+    status = Column(Enum(OrderStatus), default=OrderStatus.PENDING)
+    stripe_payment_intent_id = Column(String(255), nullable=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+class OrderItem(Base):
+    __tablename__ = "order_items"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    order_id = Column(Integer, ForeignKey("orders.id"), nullable=False)
+    book_id = Column(Integer, ForeignKey("books.id"), nullable=False)
+    quantity = Column(Integer, nullable=False)
+    price = Column(Float, nullable=False)
+    
+    order = relationship("Order", backref="items")
+    book = relationship("Book")

app/schemas/__init__.py

@@ -0,0 +1,9 @@
+from .book import BookCreate, BookUpdate, BookResponse
+from .inventory import InventoryCreate, InventoryUpdate, InventoryResponse
+from .order import OrderCreate, OrderResponse, PaymentIntentCreate, OrderItemResponse
+
+__all__ = [
+    "BookCreate", "BookUpdate", "BookResponse",
+    "InventoryCreate", "InventoryUpdate", "InventoryResponse", 
+    "OrderCreate", "OrderResponse", "PaymentIntentCreate", "OrderItemResponse"
+]

app/schemas/book.py

@@ -0,0 +1,40 @@
+from pydantic import BaseModel, Field
+from datetime import datetime
+from typing import Optional
+
+class BookBase(BaseModel):
+    title: str = Field(..., min_length=1, max_length=255)
+    author: str = Field(..., min_length=1, max_length=255)
+    isbn: str = Field(..., min_length=10, max_length=13)
+    description: Optional[str] = None
+    price: float = Field(..., gt=0)
+    category: str = Field(..., min_length=1, max_length=100)
+    publisher: Optional[str] = None
+    publication_date: Optional[datetime] = None
+    pages: Optional[int] = Field(None, gt=0)
+    language: str = Field(default="English", max_length=50)
+
+class BookCreate(BookBase):
+    pass
+
+class BookUpdate(BaseModel):
+    title: Optional[str] = Field(None, min_length=1, max_length=255)
+    author: Optional[str] = Field(None, min_length=1, max_length=255)
+    isbn: Optional[str] = Field(None, min_length=10, max_length=13)
+    description: Optional[str] = None
+    price: Optional[float] = Field(None, gt=0)
+    category: Optional[str] = Field(None, min_length=1, max_length=100)
+    publisher: Optional[str] = None
+    publication_date: Optional[datetime] = None
+    pages: Optional[int] = Field(None, gt=0)
+    language: Optional[str] = Field(None, max_length=50)
+    is_active: Optional[bool] = None
+
+class BookResponse(BookBase):
+    id: int
+    is_active: bool
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+    
+    class Config:
+        from_attributes = True

app/schemas/inventory.py

@@ -0,0 +1,26 @@
+from pydantic import BaseModel, Field
+from datetime import datetime
+from typing import Optional
+
+class InventoryBase(BaseModel):
+    book_id: int
+    quantity: int = Field(..., ge=0)
+    reserved_quantity: int = Field(default=0, ge=0)
+    reorder_level: int = Field(default=10, ge=0)
+
+class InventoryCreate(InventoryBase):
+    pass
+
+class InventoryUpdate(BaseModel):
+    quantity: Optional[int] = Field(None, ge=0)
+    reserved_quantity: Optional[int] = Field(None, ge=0)
+    reorder_level: Optional[int] = Field(None, ge=0)
+
+class InventoryResponse(InventoryBase):
+    id: int
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+    available_quantity: int
+    
+    class Config:
+        from_attributes = True

app/schemas/order.py

@@ -0,0 +1,41 @@
+from pydantic import BaseModel, Field, EmailStr
+from datetime import datetime
+from typing import List, Optional
+from app.models.order import OrderStatus
+
+class OrderItemBase(BaseModel):
+    book_id: int
+    quantity: int = Field(..., gt=0)
+
+class OrderItemCreate(OrderItemBase):
+    pass
+
+class OrderItemResponse(OrderItemBase):
+    id: int
+    price: float
+    
+    class Config:
+        from_attributes = True
+
+class OrderBase(BaseModel):
+    customer_email: EmailStr
+    customer_name: str = Field(..., min_length=1, max_length=255)
+    customer_address: str = Field(..., min_length=1)
+
+class OrderCreate(OrderBase):
+    items: List[OrderItemCreate]
+
+class OrderResponse(OrderBase):
+    id: int
+    total_amount: float
+    status: OrderStatus
+    stripe_payment_intent_id: Optional[str] = None
+    items: List[OrderItemResponse]
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+    
+    class Config:
+        from_attributes = True
+
+class PaymentIntentCreate(BaseModel):
+    order_id: int

app/services/stripe_service.py

@@ -0,0 +1,48 @@
+import stripe
+import os
+from typing import Dict, Any
+from fastapi import HTTPException
+
+stripe.api_key = os.getenv("STRIPE_SECRET_KEY")
+
+class StripeService:
+    @staticmethod
+    def create_payment_intent(amount: float, currency: str = "usd", metadata: Dict[str, Any] = None) -> Dict[str, Any]:
+        try:
+            intent = stripe.PaymentIntent.create(
+                amount=int(amount * 100),  # Stripe expects amount in cents
+                currency=currency,
+                metadata=metadata or {},
+                automatic_payment_methods={'enabled': True}
+            )
+            return {
+                "client_secret": intent.client_secret,
+                "payment_intent_id": intent.id,
+                "amount": intent.amount / 100,
+                "status": intent.status
+            }
+        except stripe.error.StripeError as e:
+            raise HTTPException(status_code=400, detail=f"Stripe error: {str(e)}")
+    
+    @staticmethod
+    def confirm_payment_intent(payment_intent_id: str) -> Dict[str, Any]:
+        try:
+            intent = stripe.PaymentIntent.retrieve(payment_intent_id)
+            return {
+                "payment_intent_id": intent.id,
+                "status": intent.status,
+                "amount": intent.amount / 100
+            }
+        except stripe.error.StripeError as e:
+            raise HTTPException(status_code=400, detail=f"Stripe error: {str(e)}")
+    
+    @staticmethod
+    def cancel_payment_intent(payment_intent_id: str) -> Dict[str, Any]:
+        try:
+            intent = stripe.PaymentIntent.cancel(payment_intent_id)
+            return {
+                "payment_intent_id": intent.id,
+                "status": intent.status
+            }
+        except stripe.error.StripeError as e:
+            raise HTTPException(status_code=400, detail=f"Stripe error: {str(e)}")

main.py

@@ -0,0 +1,45 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from app.api import books, inventory, orders
+from app.db.session import engine
+
+app = FastAPI(
+    title="Bookstore Management API",
+    description="A comprehensive REST API for managing a bookstore with inventory and payment processing",
+    version="1.0.0",
+    openapi_url="/openapi.json"
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(books.router, prefix="/api/v1")
+app.include_router(inventory.router, prefix="/api/v1")
+app.include_router(orders.router, prefix="/api/v1")
+
+@app.on_event("startup")
+def create_tables():
+    from app.db.base import Base
+    Base.metadata.create_all(bind=engine)
+
+@app.get("/")
+def root():
+    return {
+        "title": "Bookstore Management API",
+        "description": "A comprehensive REST API for managing a bookstore with inventory and payment processing",
+        "documentation": "/docs",
+        "health_check": "/health"
+    }
+
+@app.get("/health")
+def health_check():
+    return {
+        "status": "healthy",
+        "service": "Bookstore Management API",
+        "version": "1.0.0"
+    }

requirements.txt

@@ -0,0 +1,9 @@
+fastapi==0.104.1
+uvicorn==0.24.0
+sqlalchemy==2.0.23
+alembic==1.12.1
+pydantic==2.5.0
+python-multipart==0.0.6
+stripe==7.8.0
+ruff==0.1.6
+python-dotenv==1.0.0