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{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Web.OpenWeatherMap.Types.Location
( Location(..)
) where
import Data.ByteString (ByteString)
import Data.Proxy (Proxy(..))
import Data.Text (Text)
import Data.Text.Encoding (encodeUtf8)
import Servant.API ((:>))
import Servant.Client (Client, HasClient, clientWithRoute, hoistClientMonad)
import Servant.Client.Core.Request (Request, appendToQueryString)
import Web.HttpApiData (ToHttpApiData, toQueryParam)
-- | Various ways to specify location.
data Location
= Name String -- ^ City name.
| Coord Double Double -- ^ Geographic coordinates: latitude and longitude.
addParam :: ToHttpApiData a => Text -> a -> Request -> Request
addParam name = appendToQueryString name . Just . encodeUtf8 . toQueryParam
instance HasClient m api => HasClient m (Location :> api) where
type Client m (Location :> api) = Location -> Client m api
hoistClientMonad pm _ f cl = hoistClientMonad pm (Proxy :: Proxy api) f . cl
clientWithRoute pm Proxy req loc =
clientWithRoute pm (Proxy :: Proxy api) (addParams loc req)
where
addParams (Name q) = addParam "q" q
addParams (Coord lat lon) = addParam "lat" lat . addParam "lon" lon
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