'use strict'

const http = require('http')
const url = require('url')

const host = process.env.HOST || '0.0.0.0'
const port = process.env.PORT || 8080

const userList = [
  {'id': 1, 'first_name': 'Bob', 'second_name': 'Smith', type: 'red'},
  {'id': 2, 'first_name': 'David', 'second_name': 'Clements', type: 'blue'}
]

const server = http.createServer((req, res) => {
  if (req.method !== 'GET') return error(res, 405)
  if (req.url === '/') return index(res)
  const {pathname, query} = url.parse(req.url, true)
  if (pathname === '/users') return users(query, res)
  
  error(res, 404)
})

function error (res, code) {
  res.statusCode = code
  res.end(`{"error": "${http.STATUS_CODES[code]}"}`)
}

function users ({type}, res) {
  const list = !type ? userList : userList.filter((user) => user.type === type)
  res.end(`{"data": ${JSON.stringify(list)}}`) 
}

function index (res) {
  res.end('{"name": "my-rest-server", "version": 0}')
}

server.listen(port, host)