const express = require("express");
const bodyParser = require("body-parser");

const app = express();
const PORT = 8080;

// Middleware to parse JSON
app.use(bodyParser.json());

// In-memory data store
let items = [];
let currentId = 1;

// Routes

// CREATE - Add a new item
app.post("/items", (req, res) => {
  const { name, description } = req.body;

  if (!name) {
    return res.status(400).json({ error: "Name is required" });
  }

  const newItem = { id: currentId++, name, description };
  items.push(newItem);
  res.status(201).json(newItem);
});

// READ - Get all items
app.get("/items", (req, res) => {
  res.json(items);
});

// READ - Get item by ID
app.get("/items/:id", (req, res) => {
  const { id } = req.params;
  const item = items.find((i) => i.id === parseInt(id));

  if (!item) {
    return res.status(404).json({ error: "Item not found" });
  }

  res.json(item);
});

// UPDATE - Update item by ID
app.put("/items/:id", (req, res) => {
  const { id } = req.params;
  const { name, description } = req.body;

  const item = items.find((i) => i.id === parseInt(id));
  if (!item) {
    return res.status(404).json({ error: "Item not found" });
  }

  if (name) item.name = name;
  if (description) item.description = description;

  res.json(item);
});

// DELETE - Remove item by ID
app.delete("/items/:id", (req, res) => {
  const { id } = req.params;
  const itemIndex = items.findIndex((i) => i.id === parseInt(id));

  if (itemIndex === -1) {
    return res.status(404).json({ error: "Item not found" });
  }

  items.splice(itemIndex, 1);
  res.status(204).send();
});

// Start server
app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});