module Handlers where

import Core
import Database

import qualified Data.ByteString.Char8    as C
import Data.List
import qualified Data.Text                as T
import Effectful
import Effectful.Error.Static             (Error, throwError)
import Effectful.FileSystem
import Effectful.FileSystem.IO.ByteString as EBS
import Servant hiding                     ((:>), throwError)
import qualified Servant                  as S

rootHandler :: (Error ServerError :> es) => Eff es T.Text
rootHandler = return "Hello, World!"

userListHandler :: (Database :> es, Error ServerError :> es, FileSystem :> es) => Eff es [User]
userListHandler = databaseRead_ "SELECT id, name FROM users"

userGetHandler :: (Database :> es, Error ServerError :> es, FileSystem :> es) => Int -> Eff es User
userGetHandler userId = databaseRead (queryUser userId) >>= \mUser -> 
  case mUser of
    (a:_) -> pure a
    []    -> pure (User 0 "No user found")

userPostHandler :: (Database :> es, Error ServerError :> es, FileSystem :> es) => String -> Eff es NoContent
userPostHandler name = databaseWrite (writeUser name) >>= \_ -> return NoContent