Linsen, you have arrived #126
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| {-# LANGUAGE FlexibleContexts, OverloadedStrings, LambdaCase #-} | ||
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||
| module Model.Linsen | ||
| ( | ||
| parse | ||
| , fetchAndCreateLinsen | ||
| ) | ||
| where | ||
|
|
||
| import Control.Monad ( (>=>) | ||
| , (<=<) | ||
| , zipWithM | ||
| , ap | ||
| ) | ||
| import Control.Monad.Catch ( MonadThrow ) | ||
| import Control.Monad.IO.Class ( MonadIO ) | ||
| import Data.Aeson ( (.:) | ||
| , withObject | ||
| , Value | ||
| ) | ||
| import Data.Aeson.Types ( Parser | ||
| , parseEither | ||
| ) | ||
| import Data.Bifunctor ( first ) | ||
| import qualified Data.ByteString.Lazy.Char8 as BL8 | ||
| import Data.Functor ( (<&>) ) | ||
| import Data.List.Extra ( (!?) ) | ||
| import Data.Text.Lazy ( Text | ||
| , replace | ||
| , strip ) | ||
| import Data.Thyme.Calendar ( Day ) | ||
| import Lens.Micro.Platform ( (^.) ) | ||
| import Network.HTTP.Req | ||
| import Model.Types ( NoMenu(..) | ||
| , Menu(..) | ||
| , Restaurant | ||
| ( Restaurant | ||
| ) | ||
| ) | ||
| import Util ( menusToEitherNoLunch ) | ||
| import Data.Thyme.Calendar.WeekDate ( weekDate | ||
| , _wdDay) | ||
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||
| fetch | ||
| :: (MonadHttp m, MonadIO m, MonadThrow m) | ||
| => m Value -- ^ A JSON response or horrible crash | ||
| fetch = | ||
| req | ||
| GET | ||
| (https "cafe-linsen.se" /: "api" /: "menu") | ||
| NoReqBody | ||
| jsonResponse | ||
| mempty | ||
| <&> responseBody | ||
|
|
||
| parse | ||
| :: Day -- ^ Day to parse | ||
| -> Value -- ^ JSON result from `fetch` | ||
| -> Either NoMenu [Menu] -- ^ Either list of parsed `Menu`s or `NoMenu` error | ||
| parse day = | ||
| failWithNoMenu | ||
| (parseEither | ||
| (let index = 6 - day ^. weekDate . _wdDay in | ||
| if index `notElem` [1..5] then | ||
| pure . const [] | ||
| else | ||
| withObject "Parse meals" | ||
| $ (.: "docs") | ||
| >=> (\case | ||
| Nothing -> fail "Failed to index into days" | ||
| Just v -> pure v) . (!? index) | ||
| >=> (.: "richText") | ||
| >=> (.: "root") | ||
| >=> (.: "children") | ||
| >=> menuParser . (\v' -> if length v' >= 9 then v' else mempty) | ||
| ) | ||
| ) | ||
| >=> menusToEitherNoLunch | ||
| where | ||
| failWithNoMenu :: Show a => (a -> Either String b) -> a -> Either NoMenu b | ||
| failWithNoMenu action x = | ||
| first (\msg -> NMParseError msg . BL8.pack . show $ x) (action x) | ||
|
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||
| menuParser :: [Value] -> Parser [Menu] | ||
| menuParser = pure . (zip [0 :: Integer ..] >=> \case | ||
| (2 ,vs) -> [vs] -- Index of Meat dish | ||
| (6 ,vs) -> [vs] -- Index of Fish dish | ||
| (10,vs) -> [vs] -- Index of Veg dish | ||
| _ -> []) | ||
| <=< ap (zipWithM sumFood) tail | ||
|
|
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| sumFood :: Value -> Value -> Parser Menu | ||
| sumFood a b = Menu <$> getFood a <*> getFood b | ||
|
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| getFood :: Value -> Parser Text | ||
| getFood = withObject "Menu Object" | ||
| $ (.: "children") | ||
| >=> \case | ||
| [] -> pure mempty | ||
| vs -> strip . replace "/ " ", " | ||
| <$> last vs .: "text" | ||
|
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| fetchAndCreateLinsen | ||
| :: (MonadHttp m, MonadIO m, MonadThrow m) | ||
| => Day -- ^ Day | ||
| -> m Restaurant -- ^ Fetched Restaurant | ||
| fetchAndCreateLinsen day = | ||
| Restaurant | ||
| "Café Linsen" | ||
| "https://plateimpact-screen.azurewebsites.net/menu/week/" | ||
| <$> fmap (parse day) fetch | ||
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<&><- pretty!