# Project Documentation
## Overview
This project consists of three main Python files:
- `main.py`: The entry point and main logic of the application
- `utils.py`: Helper functions and utilities
- `database.py`: Database connection and operations
## main.py
The main application file.
### Key Functions
#### `run_app()`
The main entry point for the application. Initializes components and starts the main program loop.
Usage:
```python
if __name__ == '__main__':
run_app()
```
#### `process_user_input(input_string)`
Handles user input and executes appropriate actions.
Parameters:
- `input_string`: The raw user input string
Returns:
- A result object with the outcome of processing the input
Usage:
```python
result = process_user_input("add item milk")
```
## utils.py
Helper functions used throughout the application.
### Key Functions
#### `validate_input(input_string)`
Validates user input for correctness.
Parameters:
- `input_string`: The input string to validate
Returns:
- `True` if input is valid, `False` otherwise
Usage:
```python
is_valid = validate_input("add item bread")
```
#### `format_output(data)`
Formats data for display to the user.
Parameters:
- `data`: The raw data to format
Returns:
- A formatted string ready for display
Usage:
```python
formatted = format_output(items_list)
print(formatted)
```
## database.py
Handles database connections and operations.
### Key Functions
#### `connect()`
Establishes a connection to the database.
Returns:
- A database connection object
Usage:
```python
db = connect()
```
#### `insert_item(item)`
Inserts a new item into the database.
Parameters:
- `item`: The item object to insert
Returns:
- The ID of the newly inserted item
Usage:
```python
new_id = insert_item({"name": "Apple", "quantity": 5})
```
#### `get_all_items()`
Retrieves all items from the database.
Returns:
- A list of all item objects in the database
Usage:
```python
items = get_all_items()
```