const express = require('express');
const cors = require('cors');
const app = express();
const port = process.env.PORT || 3001;

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

app.get('/', (req, res) => {
  res.send('Todo API is running. Access todos at /api/todos');
});

let todos = [
  { id: 1, task: 'Learn Node.js', completed: false },
  { id: 2, task: 'Build a microservice app', completed: false }
];

app.get('/api/todos', (req, res) => {
  res.json(todos);
});

app.post('/api/todos', (req, res) => {
  if (!req.body.task) {
    return res.status(400).json({ error: 'Task is required' });
  }
  const newTodo = {
    id: Date.now(),
    task: req.body.task,
    completed: false
  };
  todos.push(newTodo);
  res.status(201).json(newTodo);
});

if (require.main === module) {
  app.listen(port, () => {
    console.log(`Backend service listening at http://localhost:${port}`);
  });
}

module.exports = app;