#!/usr/bin/env stack
{- stack
     --nix
     --resolver lts-10.3
     --install-ghc
     script
     --package http-types
     --package yesod
     --package yesod-core
     --package text
     --package aeson
-}

{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE ScopedTypeVariables #-}

import Data.Semigroup
import GHC.Generics
import Control.Monad
import Data.Maybe (isJust)
import Data.Text
import Yesod
import Network.HTTP.Types.Status (status400, status200)
import Data.Aeson

data App = App

mkYesod "App" [parseRoutes|
/query QueryR GET
/number NumberR POST
|]

-- | Start a simple warp server on 3000
main :: IO ()
main = warp 3000 App

-- | Initiate Yesod. The default method instances are fine for a prototype or
-- demo app.
instance Yesod App

-- | A type to describe the shape of our core model
data Caller = Caller
  { name :: Text
  , number :: Text
  , context :: Text
  }
  deriving (Show, Eq, Generic, ToJSON, FromJSON)


-- | Standardize errors.
data ApiError = ApiError
  { msg :: Text
  }
  deriving (Show, Eq, Generic, ToJSON, FromJSON)

-- FIXME
findByNumber = id

getQueryR :: Handler RepJson
getQueryR = do
  qm <- lookupGetParam "number"
  case qm of
    Nothing ->
      sendStatusJSON status400 $ (ApiError "Invalid request. Could not parse 'number' parameter.")

    Just q ->
      sendStatusJSON status200 $ object [ "msg" .= ("FIXME" :: Text) ]


postNumberR :: Handler RepJson
postNumberR = do
  (obj :: Result Value) <- parseJsonBody
  case obj of
    Error err ->
      sendStatusJSON status400 $ ApiError $ "Invalid request. Could not parse JSON body: " <> pack err

    Success v ->
      sendStatusJSON status200 $ object [ "msg" .= ("FIXME" :: Text) ]