API Reference

This API provides a multi-language application framework for user management and data operations. The codebase spans Python, PHP, TypeScript, and Go implementations, offering consistent patterns across different technology stacks. The core functionality revolves around user services, validation utilities, and React-based UI components.

The architecture follows object-oriented principles with service classes for business logic, utility classes for common operations, and TypeScript interfaces for type-safe component development. Both Python and PHP implementations provide similar Application and UserService classes with caching capabilities, while the TypeScript layer offers a modern async API client and reusable React components.

Key features include user data fetching with caching, input validation, date formatting utilities, and a collection of UI components (Button, Card, Form) with TypeScript type definitions. The API supports both synchronous and asynchronous operations, making it suitable for various application contexts from server-side processing to client-side web applications.

Application Classes

Main application entry points that orchestrate services and handle application lifecycle

Application (Python)

class

class Application:
    def __init__(self, config: dict)
    def run(self) -> None

Main application class for Python implementation. Initializes the application with configuration and manages the UserService. The run() method retrieves all users and processes them.

Usage:

app = Application({'database': 'users.db'})
app.run()

Note: Called by main function. Requires a config dictionary for initialization.

Application (PHP)

class

class Application {
    public function __construct(array $config)
    public function run(): void
}

Main application class for PHP implementation. Manages application configuration and UserService instance. The run() method orchestrates user retrieval operations.

Usage:

$app = new Application(['database' => 'users.db']);
$app->run();

Note: Called by bootstrap function. Uses typed properties for PHP 7.4+.

Service Classes

Business logic layer for user operations with caching support across multiple languages

UserService (Python)

class

class UserService:
    def __init__(self, config: dict)
    def get_all_users(self) -> List[dict]
    def get_user_by_id(self, user_id: int) -> Optional[dict]

Service class for user-related operations in Python. Provides methods to retrieve all users or individual users by ID with built-in caching mechanism. Uses private _cache dictionary to store fetched data and private _fetch_users() method for data retrieval.

Usage:

service = UserService({'api_url': 'https://api.example.com'})
users = service.get_all_users()
user = service.get_user_by_id(123)

Note: Implements internal caching to reduce redundant data fetches. Returns List[dict] for all users and Optional[dict] for individual user lookup.

UserService (PHP)

class

class UserService {
    public function __construct(array $config)
    public function getAllUsers(): array
    public function getUserById(int $id): ?array
}

Service class for user-related operations in PHP. Mirrors Python implementation with getAllUsers() and getUserById() methods. Maintains internal cache array to optimize repeated queries.

Usage:

$service = new UserService(['api_url' => 'https://api.example.com']);
$users = $service->getAllUsers();
$user = $service->getUserById(123);

Note: Uses nullable return type (?array) for getUserById to handle cases where user is not found. Private fetchUsers() method handles actual data retrieval.

UserService (TypeScript)

class

export class UserService {
    constructor(baseUrl: string)
    async getUsers(): Promise<User[]>
    async getUserById(id: number): Promise<User | null>
}

Async service class for user operations in TypeScript. Provides Promise-based methods for fetching users from a REST API endpoint. Uses native fetch API for HTTP requests.

Usage:

const service = new UserService('https://api.example.com');
const users = await service.getUsers();
const user = await service.getUserById(123);

Note: All methods are async and return Promises. Requires User type to be defined. Uses ES6 class syntax with export for module usage.

Utility Classes

Helper classes and traits for common operations like validation, formatting, and logging

DateFormatter

class

class DateFormatter:
    def __init__(self, format_string: str = '%Y-%m-%d')
    def format(self, date: datetime) -> str

Utility class for formatting datetime objects in Python. Accepts a custom format string during initialization (defaults to '%Y-%m-%d') and provides a format() method to convert datetime objects to formatted strings.

Usage:

from datetime import datetime
formatter = DateFormatter('%Y-%m-%d %H:%M')
formatted = formatter.format(datetime.now())
# Custom format: '2024-01-15 14:30'

Note: Uses Python's strftime for formatting. Format string follows standard datetime formatting codes.

Validator

class

class Validator {
    public static function validateUser(array $user): bool
    public static function validateEmail(string $email): bool
}

Static utility class for validation operations in PHP. Provides methods to validate user data structures and email addresses. All methods are static and do not require instantiation.

Usage:

$isValid = Validator::validateUser(['name' => 'John', 'email' => 'john@example.com']);
$emailValid = Validator::validateEmail('test@example.com');

Note: validateUser checks for presence of 'name' and 'email' keys. validateEmail uses PHP's FILTER_VALIDATE_EMAIL filter.

Helper

class

class Helper {
    public static function formatName(string $name): string
    public static function formatDate(\DateTime $date): string
}

Static utility class providing formatting helpers in PHP. Includes methods for name capitalization and date formatting. All methods are static for convenient access.

Usage:

$formatted = Helper::formatName('john doe');
// Returns: 'John Doe'
$dateStr = Helper::formatDate(new \DateTime());

Note: formatName converts to lowercase then capitalizes each word. formatDate returns dates in 'Y-m-d' format.

Loggable

class

trait Loggable {
    public function log(string $message): void
}

PHP trait that provides logging functionality to classes. Can be included in any class to add a log() method that outputs messages with a [LOG] prefix.

Usage:

class MyClass {
    use Loggable;
}
$obj = new MyClass();
$obj->log('Operation completed');

Note: Uses echo for output. In production, consider replacing with proper logging framework.

Data Models

Data structures and type definitions for representing domain entities

User (Go)

class

type User struct {
    ID   int
    Name string
}

Go struct representing a user entity with ID and Name fields. Simple data structure for user information.

Usage:

user := User{
    ID:   1,
    Name: "John Doe",
}

Note: Exported struct with exported fields (capitalized). Can be used with JSON encoding/decoding.

TypeScript Interfaces

Type definitions for React components and data structures ensuring type safety

ButtonProps

interface

export interface ButtonProps {
    label: string;
    onClick: () => void;
    disabled?: boolean;
    variant?: 'primary' | 'secondary';
}

Props interface for Button component. Defines the contract for button properties including label text, click handler, optional disabled state, and optional variant styling. Two versions exist with slightly different properties.

Usage:

const props: ButtonProps = {
    label: 'Submit',
    onClick: () => console.log('Clicked'),
    variant: 'primary'
};

Note: The types.ts version includes variant property for styling options. disabled and variant are optional (marked with ?).

CardProps

interface

export interface CardProps {
    title: string;
    children: React.ReactNode;
    className?: string;
}

Props interface for Card component. Defines properties for card title, children content, and optional className for styling. Supports React component composition pattern.

Usage:

const cardProps: CardProps = {
    title: 'User Profile',
    children: <div>Content here</div>,
    className: 'custom-card'
};

Note: children accepts any valid React node. className is optional for custom styling in types.ts version.

FormData

interface

export interface FormData {
    [key: string]: string;
}

Generic interface for form data with string index signature. Allows dynamic key-value pairs where all values are strings. Useful for handling arbitrary form inputs.

Usage:

const formData: FormData = {
    username: 'john_doe',
    email: 'john@example.com',
    message: 'Hello world'
};

Note: Flexible structure for form handling. All values must be strings; use type conversion if other types needed.

React Components

Reusable UI components built with React and TypeScript

App

function

function App(): JSX.Element

Root application component that returns the main JSX structure for the React application.

Usage:

import App from './App';
ReactDOM.render(<App />, document.getElementById('root'));

Note: Main entry point for React application. Defined in src/App.tsx.

Button

function

function Button({ label, onClick, disabled }: ButtonProps): JSX.Element

Reusable button component accepting label, onClick handler, and optional disabled state. Returns a styled button element with provided properties.

Usage:

<Button 
    label="Click Me" 
    onClick={() => alert('Clicked!')} 
    disabled={false} 
/>

Note: Uses destructured props matching ButtonProps interface. Handles click events and disabled state.

Card

function

function Card({ title, children }: CardProps): JSX.Element

Container component for displaying titled content cards. Accepts title and children props to create a structured card layout.

Usage:

<Card title="User Details">
    <p>Name: John Doe</p>
    <p>Email: john@example.com</p>
</Card>

Note: Compositional component that wraps children content. Uses CardProps interface for type safety.

CardHeader

function

function CardHeader({ title }: { title: string }): JSX.Element

Sub-component for rendering card header section with a title. Used internally by Card component or standalone.

Usage:

<CardHeader title="Section Title" />

Note: Exported from Card.tsx. Can be used independently for custom card layouts.

CardBody

function

function CardBody({ children }: { children: React.ReactNode }): JSX.Element

Sub-component for rendering card body content. Wraps children in appropriate styling/structure for card body section.

Usage:

<CardBody>
    <p>Content goes here</p>
</CardBody>

Note: Exported from Card.tsx. Accepts any React node as children.

Form

function

function Form({ onSubmit }: FormProps): JSX.Element

Form component with onSubmit callback handler. Manages form state and submission logic.

Usage:

<Form onSubmit={(data) => console.log(data)} />

Note: Requires FormProps interface definition. Handles form submission events.

Utility Functions

Standalone helper functions for common operations

async_fetch_data

function

async def async_fetch_data(url: str) -> dict

Async function in Python for fetching data from a URL. Returns the fetched data as a dictionary.

Usage:

import asyncio
data = await async_fetch_data('https://api.example.com/data')
# Or with asyncio.run:
data = asyncio.run(async_fetch_data('https://api.example.com/data'))

Note: Requires async/await syntax. Must be called from async context or with asyncio.run().

bootstrap

function

function bootstrap()

PHP bootstrap function for application initialization. Sets up the application environment and dependencies.

Usage:

require_once 'index.php';
bootstrap();

Note: Entry point for PHP application. Calls Application class internally.

capitalize

function

function capitalize(str: string): string

TypeScript utility function that capitalizes the first letter of a string and converts the rest to lowercase.

Usage:

const result = capitalize('hello world');
// Returns: 'Hello world'

Note: Defined in src/utils/helpers.ts. Handles edge cases like empty strings.

delay

function

function delay(ms: number): Promise<void>

Async utility function that creates a promise-based delay. Useful for adding pauses in async code or implementing retry logic.

Usage:

await delay(1000); // Wait 1 second
console.log('Delayed execution');

Note: Returns a Promise that resolves after specified milliseconds. Does not block synchronous code.