// @flow

import Koa from 'koa'

import { createConfig, validateConfig } from './config'
import { createContext } from './context'
import log from './log'
import { createRouter } from './router'
import type { Config, Handlers } from './types'

export const createServer = (handlers: Handlers, config: Config) => {
  log('create server', config)

  const server = new Koa()
  const context = createContext(config)
  const router = createRouter(handlers, context)

  server.use(router.routes())
  server.use(router.allowedMethods())

  return server
}

export const startServer = (handlers: Handlers, cfg?: Object) => {
  const config = createConfig(cfg)
  validateConfig(config)
  createServer(handlers, config).listen(config.port)
  log(`listening on port ${config.port}`)
}