234 lines
7.6 KiB
Markdown
234 lines
7.6 KiB
Markdown
# Invoice Generation Service
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This is a FastAPI application for generating and managing invoices. It allows you to create, read, update, and delete invoices without requiring user signup.
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## Features
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- Generate invoices with automatic invoice number generation
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- Store invoice details in SQLite database
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- Retrieve invoice information by ID or invoice number
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- Update invoice details and status
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- Delete invoices
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- Web-based user interface for invoice management
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- Health check endpoint
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## Technical Stack
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- **Framework**: FastAPI
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- **Database**: SQLite with SQLAlchemy ORM
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- **Migrations**: Alembic
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- **Validation**: Pydantic
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- **Frontend**: Jinja2 Templates, HTML, CSS, JavaScript
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- **Linting**: Ruff
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## Project Structure
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```
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.
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├── alembic.ini # Alembic configuration file
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├── app # Application package
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│ ├── api # API routes
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│ │ └── routes # API route modules
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│ │ ├── __init__.py # Routes initialization
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│ │ ├── invoices.py # Invoice API routes
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│ │ └── frontend.py # Frontend routes
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│ ├── core # Core functionality
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│ │ ├── config.py # Application settings
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│ │ ├── database.py # Database connection setup
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│ │ └── utils.py # Utility functions
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│ ├── models # SQLAlchemy models
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│ │ ├── __init__.py # Models initialization
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│ │ └── invoice.py # Invoice and InvoiceItem models
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│ ├── schemas # Pydantic schemas
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│ │ ├── __init__.py # Schemas initialization
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│ │ └── invoice.py # Invoice-related schemas
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│ ├── static # Static files
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│ │ ├── css # CSS styles
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│ │ │ └── styles.css # Main stylesheet
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│ │ └── js # JavaScript files
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│ │ └── main.js # Main JavaScript file
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│ └── templates # Jinja2 templates
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│ ├── base.html # Base template with layout
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│ ├── home.html # Home page
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│ ├── create_invoice.html # Invoice creation form
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│ ├── search_invoice.html # Search for invoices
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│ └── invoice_details.html # Invoice details page
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├── main.py # Application entry point
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├── migrations # Alembic migrations
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│ ├── env.py # Alembic environment
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│ ├── script.py.mako # Migration script template
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│ └── versions # Migration scripts
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│ └── ef0aaab3a275_initial_database_tables.py # Initial migration
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├── requirements.txt # Project dependencies
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└── pyproject.toml # Ruff configuration
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```
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## API Endpoints
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### Health Check
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- `GET /health`: Check if the service is running
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### Invoice Management API
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- `POST /api/v1/invoices`: Create a new invoice
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- `GET /api/v1/invoices`: List all invoices (with pagination)
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- Query parameters:
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- `skip`: Number of records to skip (default: 0)
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- `limit`: Maximum number of records to return (default: 100)
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- `fields`: Comma-separated list of fields to include in the response (e.g., "id,invoice_number,total_amount")
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- `status`: Filter invoices by status (e.g., "PENDING", "PAID", "CANCELLED")
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- `sort_order`: Sort by creation date, either "asc" (oldest first) or "desc" (newest first, default)
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- `GET /api/v1/invoices/{invoice_id}`: Get a specific invoice by ID
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- Query parameters:
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- `fields`: Comma-separated list of fields to include in the response (e.g., "id,invoice_number,total_amount")
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- `GET /api/v1/invoices/find`: Find an invoice by invoice number
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- Query parameters:
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- `invoice_number`: Invoice number to search for (required)
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- `fields`: Comma-separated list of fields to include in the response (e.g., "id,invoice_number,total_amount")
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- `PATCH /api/v1/invoices/{invoice_id}`: Update an invoice
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- `PATCH /api/v1/invoices/{invoice_id}/status`: Update invoice status
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- `DELETE /api/v1/invoices/{invoice_id}`: Delete an invoice
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### Frontend Routes
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- `GET /`: Home page with list of recent invoices
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- `GET /create`: Form to create a new invoice
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- `POST /create`: Process invoice creation form
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- `GET /search`: Form to search for invoices by number
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- `POST /search`: Process invoice search
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- `GET /invoice/{invoice_id}`: View invoice details
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- `POST /invoice/{invoice_id}/status`: Update invoice status
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## Setup and Installation
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1. Clone the repository
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2. Install dependencies:
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```
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pip install -r requirements.txt
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```
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3. Run migrations:
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```
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alembic upgrade head
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```
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4. Start the application:
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```
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uvicorn main:app --reload
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```
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## API Documentation
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Once the application is running, you can access:
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- Interactive API documentation at `/docs` (Swagger UI)
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- Alternative API documentation at `/redoc` (ReDoc)
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## Web Interface
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The application comes with a full web interface that allows users to:
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- View a list of recent invoices on the home page
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- Create new invoices using a dynamic form
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- Search for existing invoices by invoice number
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- View detailed invoice information
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- Update invoice status (PENDING, PAID, CANCELLED)
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- Print invoices
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## Invoice Number Format
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Invoices are automatically assigned a unique invoice number with the format:
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- `INV-YYYYMM-XXXXXX`, where:
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- `INV` is a fixed prefix
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- `YYYYMM` is the year and month (e.g., 202307 for July 2023)
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- `XXXXXX` is a random alphanumeric string
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## Query Parameters
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### Field Filtering
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The API supports field filtering for GET operations. This allows clients to request only the specific fields they need, which can improve performance and reduce bandwidth usage.
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#### How to Use Field Filtering:
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1. Add a `fields` query parameter to GET requests
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2. Specify a comma-separated list of field names to include in the response
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#### Example:
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To get only the ID, invoice number, and total amount of invoices:
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```
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GET /api/v1/invoices?fields=id,invoice_number,total_amount
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```
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This would return:
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```json
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[
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{
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"id": 1,
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"invoice_number": "INV-202307-A1B2C3",
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"total_amount": 100.0
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},
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{
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"id": 2,
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"invoice_number": "INV-202307-D4E5F6",
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"total_amount": 200.0
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}
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]
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```
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### Status Filtering
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The API supports filtering invoices by their status (PENDING, PAID, CANCELLED).
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#### How to Use Status Filtering:
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1. Add a `status` query parameter to the GET request
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2. Specify one of the allowed status values: "PENDING", "PAID", or "CANCELLED"
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#### Example:
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To get only paid invoices:
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```
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GET /api/v1/invoices?status=PAID
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```
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To combine with other parameters:
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```
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GET /api/v1/invoices?status=PENDING&fields=id,invoice_number,total_amount&limit=5
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```
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### Sorting
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The API supports sorting invoices by their creation date.
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#### How to Use Sorting:
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1. Add a `sort_order` query parameter to the GET request
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2. Specify one of the allowed values:
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- `asc`: Ascending order (oldest invoices first)
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- `desc`: Descending order (newest invoices first, this is the default)
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#### Example:
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To get invoices in chronological order (oldest first):
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```
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GET /api/v1/invoices?sort_order=asc
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```
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To combine sorting with other parameters:
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```
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GET /api/v1/invoices?sort_order=desc&status=PENDING&limit=10
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```
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### Available Fields:
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Invoices have the following fields that can be filtered:
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- `id`
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- `invoice_number`
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- `date_created`
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- `due_date`
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- `total_amount`
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- `status`
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- `customer_name`
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- `customer_email`
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- `customer_address`
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- `notes`
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- `items` (this includes related invoice items) |