import express from 'express';
import color from 'chalk';
import cors from 'cors';

// Model
import ProductModel from './model/ProductModel.js'; // Dateiendung nicht vergessen

const PORT = 8000;
const HOST = '127.0.0.1'; // 'localhost'
const BASE_URL = `http://${HOST}:${PORT}`;

const app = express();
const products = ProductModel();

const corsOptions = {
  origin: ['http://localhost:3000', 'http://127.0.0.1:3000'],
  optionsSuccessStatus: 200, // some legacy browsers (IE11, various SmartTVs) choke on 204
};

// lade Produkte
products.load();

// Middleware
app.use(cors(corsOptions)); // Fängt alle HTTP-Requests vor den Routenabfragen ab.
app.use(express.json()); // HTTP-Request Body wird als JSON Objekt erwartet und geparsed wird. // app.use(bodyParser.json()) - Modul body-parser war in express 4 notwendig

app.use((req, res, next) => {
  console.log(color.yellow('HTTP-Method: '), color.magenta(req.method));
  next();
});

// Routes
app.get('/', (req, res) => {
  // console.log(req.headers);

  res.send('SERVER WORKS!'); // HTTP-Response wird gesendet.
});

app.get('/persons', (req, res) => {
  // res.setHeader('Content-Type', 'application/json'); // nicht notwendig den Content-Type selber zu definieren, da das express automatisch zuweist.

  const persons = [
    { firstName: 'John', lastName: 'Wick' },
    { firstName: 'Jane', lastName: 'Doe' },
    { firstName: 'Max', lastName: 'Mustermann' },
  ];
  // res.send(JSON.stringify(persons)); // nicht notwendig JS Objekte in JSON Strings umzuwandeln, das das express automatisch umwandelt

  res.send(persons);
});

// REST API ======
// Representational State Transfer (abgekürzt REST)
// GET - Daten Holen
// POST - Daten hinzufügen
// PUT/PATCH - Daten aktualisieren / Einen Datensatz aktualisieren
// DELETE - Daten löschen

// HTTP - Methode - POST
// (C)RUD - create - neues Produkt erstellen
// BRE(A)D - add
app.post('/api/products', (req, res) => {
  const product = req.body;

  if (!products.add(product)) {
    return res.status(400).send({ msg: 'Could not add product', status: 400, success: false });
  }

  return res.send({ msg: 'Product added', status: 200, success: true, data: product });
});

// HTTP - Methode - GET
// C(R)UD - read
// (B)READ - browse
app.get('/api/products', (req, res) => {
  const data = products.getAll();
  return res.send(data);
});

// HTTP - Methode - GET
// C(R)UD - read
// B(R)EAD - read
app.get('/api/products/:id', (req, res) => {
  const id = req.params.id; // routenparameter :id wird als Eigenschaft in params-Objekt abgelegt
  const product = products.get(id);

  if (!product) {
    return res.status(400).send({ msg: 'Could not get product', status: 400, success: false });
  }

  return res.send(product);
});

// HTTP - Methode - PUT/PATCH
// CR(U)D - update
// BR(E)AD - edit
app.put('/api/products', (req, res) => {
  const product = req.body;

  const updated = products.update(product);

  if (!updated) {
    return res.status(400).send({ msg: 'Could not update product', status: 400, success: false });
  }

  return res.send({ msg: 'Product updated', status: 200, success: true, data: product });
});

// HTTP - Methode - PATCH
// reseten von Produkten
app.patch('/api/products/reset', (req, res) => {
  const reset = req.body.reset;

  if (!reset) {
    return res.status(400).send({ msg: 'Could not reset products', status: 400, success: false });
  }

  products.reset();

  return res.send({ msg: 'Products reseted', status: 200, success: true, data: reset });
});

// HTTP - Methode - PATCH
// speichern von Produkten
app.patch('/api/products/save', (req, res) => {
  const save = req.body.save;

  if (!save) {
    return res.status(400).send({ msg: 'Could not save products', status: 400, success: false });
  }

  products.save();

  return res.send({ msg: 'Products saved', status: 200, success: true, data: save });
});

// HTTP - Methode - DELETE
// CRU(D) - delete
// BREA(D) - delete
app.delete('/api/products/:id', (req, res) => {
  const id = req.params.id;

  if (!products.delete(id)) {
    return res.status(400).send({ msg: 'Could not delete product', status: 400, success: false });
  }

  return res.send({ msg: 'Product deleted', status: 200, success: true, data: id });
});

// =========

app.listen(PORT, HOST, () => {
  console.log(color.magenta(`🚀 Server is running at: ${BASE_URL}`));
  console.log(color.yellow('CTRL + C to close.'));
});