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

const app = express();

// parse application/json
app.use(bodyParser.json());

// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }));

const port = 3001;

let users = [
  {
    id: 1,
    email: 'johndoe',
    password: 'password',
    firstName: 'John',
    lastName: 'Doe',
  },
  {
    id: 2,
    email: 'macmiller',
    password: 'password',
    firstName: 'mac',
    lastName: 'Miller',
  },
];

app.get('/', (req, res) => res.send('Hello World!'));
app.post('/login', (req, res) => {
  console.log(req.body);
  // get parameters from post request
  let params = req.body;

  // find if any user matches login credentials
  let filteredUsers = users.filter((user) => {
    return user.email === params.email && user.password === params.password;
  });

  if (filteredUsers.length) {
    // if login details are valid return user details and fake jwt token
    let user = filteredUsers[0];
    let responseJson = {
      id: user.id,
      email: user.email,
      firstName: user.firstName,
      lastName: user.lastName,
      token: 'fake-jwt-token',
    };
    res.status(200).json(responseJson);
  } else {
    res.status(401).json({ message: 'Wrong Password or email' });
  }
});

app.post('/register', (req, res) => {
  console.log(req.body);
  // get parameters from post request
  let params = req.body;
  let user = {
    id: Math.floor(Math.random() * 11),
    email: params.email,
    password: params.password,
    firstName: params.firstName,
    lastName: params.lastName,
  };


  try {
    users.push(user);
    console.log(users)
    res
      .status(200)
      .json({
        user: {
          id: users.id,
          email: users.email,
          firstName: users.firstName,
          lastName: users.lastName,
          token: 'fake-jwt-token',
        },
      });
  } catch {
    res.status(401).json({ message: 'Wrong Password or email' });
  }
});

app.get('/users', (req, res) => {
  if (req.headers && req.headers.authorization === 'Bearer fake-jwt-token') {
    res.status(200).json(users);
  } else {
    // return 401 not authorised if token is null or invalid
    res.status(401).json({ message: 'Unauthorized' });
  }
});

app.listen(port, () => console.log(`Example app listening on port ${port}!`));