index.js

const express = require('express');
const app = express();
const port = 3000;

app.use(express.json()); 
app.use(express.static('public'));

const books = [
  { id: 1, title: 'The Alchemist', author: 'Paulo Coelho', year: 1988 },
  { id: 2, title: 'Atomic Habits', author: 'James Clear', year: 2018 },
  { id: 3, title: 'Clean Code', author: 'Robert C. Martin', year: 2008 }
];


app.get('/', (req, res) => {
  res.send('Hello, Book API is running!');
});


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


app.get('/books/:id', (req, res) => {
  const bookId = parseInt(req.params.id);
  const book = books.find(b => b.id === bookId); 

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

  res.json(book);
});


app.post('/books', (req, res) => {
  console.log('Request body:', req.body); 

  const { title, author, year } = req.body;

  if (!title || !author || !year) {
    return res.status(400).json({ error: 'All fields are required' });
  }

  const newBook = {
    id: books.length + 1,
    title,
    author,
    year
  };

  books.push(newBook);
  res.status(201).json(newBook);
});


app.put('/books/:id', (req, res) => {
  const bookId = parseInt(req.params.id);
  const { title, author, year } = req.body;

  const book = books.find(b => b.id === bookId);

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

  if (title) book.title = title;
  if (author) book.author = author;
  if (year) book.year = year;

  res.json(book);
});

app.delete('/books/:id', (req, res) => {
  const bookId = parseInt(req.params.id);
  const index = books.findIndex(b => b.id === bookId);

  if (index === -1) {
    return res.status(404).json({ error: 'Book not found' });
  }

  const deletedBook = books.splice(index, 1); 
  res.json({ message: 'Book deleted', book: deletedBook[0] });
});

app.listen(port, () => {
  console.log(`Server is running at http://localhost:${port}`);
});