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// Simple REST API example – Express + in-memory storage
// Perfect for quick prototypes or small services on Rectost

import express from 'express';
import cors from 'cors';
import { randomUUID } from 'crypto';

const app = express();
const port = process.env.PORT || 3000;

app.use(cors());
app.use(express.json());

// In-memory storage (replace with DB in production)
let todos = [];

// Health check endpoint
app.get('/health', (req, res) => {
res.status(200).json({
status: 'healthy',
uptime: process.uptime(),
timestamp: new Date().toISOString()
});
});

// GET /todos - List all todos
app.get('/todos', (req, res) => {
res.json(todos);
});

// POST /todos - Create a new todo
app.post('/todos', (req, res) => {
const { title } = req.body;
if (!title || typeof title !== 'string' || title.trim() === '') {
return res.status(400).json({ error: 'Title is required' });
}

const todo = {
id: randomUUID(),
title: title.trim(),
completed: false,
createdAt: new Date().toISOString()
};

todos.push(todo);
res.status(201).json(todo);
});

// PATCH /todos/:id - Toggle completion
app.patch('/todos/:id', (req, res) => {
const { id } = req.params;
const todo = todos.find(t => t.id === id);

if (!todo) {
return res.status(404).json({ error: 'Todo not found' });
}

todo.completed = !todo.completed;
res.json(todo);
});

// DELETE /todos/:id - Remove todo
app.delete('/todos/:id', (req, res) => {
const { id } = req.params;
const initialLength = todos.length;
todos = todos.filter(t => t.id !== id);

if (todos.length === initialLength) {
return res.status(404).json({ error: 'Todo not found' });
}

res.status(204).end();
});

// Start the server
app.listen(port, () => {
console.log(`API running on http://localhost:${port}`);
console.log('Ready for requests: GET/POST/PATCH/DELETE /todos');
});

// Graceful shutdown (useful on Rectost restart)
process.on('SIGTERM', () => {
console.log('SIGTERM received - shutting down');
process.exit(0);
});