'use strict'
import { getUsersFromStorage, generateRandomId, saveUserToStorage } from './users/storageService'
import { WrongInputError, NotFoundError, InternalError, AlreadyExists } from '../utils/customErrors'
import { Request } from 'express'
import { User } from './users/types'

/**
 * Operations on /users
 */
export default {
  /**Returns all users in store
   */
  async getUsers() {
    try {
      return await getUsersFromStorage()
    } catch (error) {
      throw new NotFoundError(error)
    }
  },
  /**Creates a new user in the store.
   */
  async postUser(req: Request) {
    if (req && req.body && req.body.user) {
      let user: User = req.body.user
      if (user && user.email && user.name && user.role) {
        user.source = 'manual'
        user.id = generateRandomId() || 'EMPTY_STRING' //check generateRandomId() for explanation
        try {
          return await saveUserToStorage(user)
        } catch (error) {
          if (error instanceof Error) {
            throw new InternalError(error.message)
          } else {
            throw new AlreadyExists(error)
          }
        }
      } else {
        throw new WrongInputError('email, name and/or role were not found in user body')
      }
    } else {
      throw new WrongInputError('request body doesnt have parameter user')
    }
  }
}