82 lines
2.6 KiB
Haskell
82 lines
2.6 KiB
Haskell
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{-# LANGUAGE OverloadedStrings #-}
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module ICAFocus where
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import qualified Network.HTTP.Client as H
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import qualified Network.HTTP.Client.TLS as H
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import Network.HTTP.Types.Status
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import Data.Aeson
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import Data.Aeson.Types
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import Data.Aeson.KeyMap
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import Data.Text
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import Text.Read
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import Data.ByteString.Lazy
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import GHC.Generics
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newtype ImageLink = ImageLink { getLink :: String }
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deriving (Show)
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newtype ImageData = ImageData { getData :: ByteString }
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instance Show ImageData where
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show _ = "ImageData { ... }"
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data ICAFocusItem a = ICAFocusItem
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{ name :: Text
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, image :: a
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, pricePerUnit :: Float
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, pricePerKg :: Float
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}
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deriving (Show, Functor)
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type ICAFocusData = ICAFocusItem ImageLink
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type ICAFocusProduct = ICAFocusItem ImageData
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instance FromJSON ICAFocusData where
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parseJSON (Object v) = do
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productMap <- (v .: "entities") >>= (.: "product") :: Parser Object
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product <- case elems productMap of
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[Object x] -> pure x
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[] -> fail "No products"
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_ -> fail "Too many products"
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name <- product .: "name"
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pricePerUnitStr <- product .: "price" >>= (.: "current") >>= (.: "amount") :: Parser String
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pricePerUnit <- case readEither pricePerUnitStr of
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Right x -> pure x
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Left e -> fail e
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pricePerKgStr <- product .: "price" >>= (.: "unit") >>= (.: "current") >>= (.: "amount") :: Parser String
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pricePerKg <- case readEither pricePerKgStr of
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Right x -> pure x
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Left e -> fail e
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imageLink <- product .: "image" >>= (.: "src")
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pure $ ICAFocusItem name (ImageLink imageLink) pricePerUnit pricePerKg
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loadProductData :: Int -> IO (Either String ICAFocusData)
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loadProductData product_id = do
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httpman <- H.newManager H.tlsManagerSettings
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req <- H.parseRequest $ "https://handlaprivatkund.ica.se/stores/1004247/api/v4/products/bop?retailerProductId=" ++ show product_id
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resp <- H.httpLbs req httpman
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if H.responseStatus resp == status200
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then pure $ eitherDecode $ H.responseBody resp
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else pure $ Left "Error status code"
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loadProductImage :: ICAFocusData -> IO (Either String ICAFocusProduct)
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loadProductImage x = do
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httpman <- H.newManager H.tlsManagerSettings
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req <- H.parseRequest $ (getLink . image) x
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resp <- H.httpLbs req httpman
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if H.responseStatus resp == status200
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then do
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let imageData = H.responseBody resp
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pure $ Right $ (const (ImageData imageData)) <$> x
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else pure $ Left "Error status code"
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loadProduct :: Int -> IO (Either String ICAFocusProduct)
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loadProduct product_id = do
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prod <- loadProductData product_id
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case prod of
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Right x -> loadProductImage x
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Left e -> pure $ Left e
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