{-# LANGUAGE TemplateHaskell     #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE RecordWildCards     #-}
{-# LANGUAGE OverloadedStrings   #-}
{-# LANGUAGE TypeOperators       #-}
{-# LANGUAGE DeriveGeneric       #-}

module Speechmatics.JSON.PostJob where

import           System.Exit        (exitFailure, exitSuccess)
import           System.IO          (stderr, hPutStrLn)
import qualified Data.ByteString.Lazy.Char8 as BSL
import           System.Environment (getArgs)
import           Control.Monad      (forM_, mzero, join)
import           Control.Applicative
import           Data.Aeson.AutoType.Alternative
import           Data.Aeson(decode, Value(..), FromJSON(..), ToJSON(..),
                            pairs, eitherDecode,
                            (.:), (.:?), object)
import           Data.Monoid
import           Data.Text (Text)
import qualified GHC.Generics

-- | Workaround for https://github.com/bos/aeson/issues/287.
o .:?? val = fmap join (o .:? val)


data PostJob = PostJob { 
    checkWait :: (Maybe Value),
    cost :: Double,
    balance :: Double,
    postId :: Integer
  } deriving (Show,Eq,GHC.Generics.Generic)


instance FromJSON PostJob where
  parseJSON (Object v) = PostJob <$> v .:?? "check_wait" <*> v .:   "cost" <*> v .:   "balance" <*> v .:   "id"
  parseJSON _          = mzero

parse :: BSL.ByteString -> Either String PostJob
parse = eitherDecode