From 1cfeff547d80eb61a1db8102f06011e73dd2fd9f Mon Sep 17 00:00:00 2001
From: Ben Sima <ben@bsima.me>
Date: Wed, 27 Mar 2019 16:24:07 -0700
Subject: almost working

---
 lore/Biz/Ibb/Core.hs        | 24 +++++++++++++++++++++---
 lore/Biz/Ibb/Influencers.hs | 13 +++++++++++--
 lore/Biz/Ibb/Move.hs        | 36 +++++++++++++++++++++++++++++++++---
 3 files changed, 65 insertions(+), 8 deletions(-)

(limited to 'lore')

diff --git a/lore/Biz/Ibb/Core.hs b/lore/Biz/Ibb/Core.hs
index 8fd0068..4ec87e3 100644
--- a/lore/Biz/Ibb/Core.hs
+++ b/lore/Biz/Ibb/Core.hs
@@ -17,14 +17,28 @@ type Routes = Home
 type Home = View Action
 
 data Model = Model
-  { modelUri :: URI
-  , people :: [Person]
+  { uri :: URI
+  , people :: WebData [Person]
   } deriving (Show, Eq)
 
+data RemoteData e a
+  = NotAsked
+  | Loading
+  | Failure e
+  | Success a
+  deriving (Show, Eq)
+
+type WebData a = RemoteData MisoString a
+
+init :: URI -> Model
+init u = Model u Loading
+
 data Action
   = Nop
   | ChangeRoute URI
   | HandleRoute URI
+  | FetchPeople
+  | SetPeople (WebData [Person])
   deriving (Show, Eq)
 
 home :: Model -> View Action
@@ -51,7 +65,11 @@ see m = div_ [ class_ "container mt-5" ]
             [ text "Get new book recommendations from the world's influencers in your email." ]
         ]
       ]
-  , div_ [ class_ "card-columns" ] $ seePerson /@ people m
+  , div_ [ class_ "card-columns" ] $ case people m of
+      NotAsked -> [ text "Initializing..." ]
+      Loading -> [ text "Loading..." ]
+      Failure err -> [ text err ]
+      Success ps -> seePerson /@ ps
   ]
 
 seePerson :: Person -> View Action
diff --git a/lore/Biz/Ibb/Influencers.hs b/lore/Biz/Ibb/Influencers.hs
index beeaf41..f00fe2e 100644
--- a/lore/Biz/Ibb/Influencers.hs
+++ b/lore/Biz/Ibb/Influencers.hs
@@ -1,7 +1,10 @@
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE DeriveGeneric #-}
 module Biz.Ibb.Influencers where
 
+import Data.Aeson
 import Data.Text.Lazy (Text)
+import GHC.Generics (Generic)
 
 data Person = Person
   { _name :: Text
@@ -10,13 +13,19 @@ data Person = Person
   , _website :: Text
   , _books :: [Book]
   , _blurb :: Text
-  } deriving (Show, Eq)
+  } deriving (Generic, Show, Eq)
+
+instance FromJSON Person
+instance ToJSON Person
 
 data Book = Book
   { _title :: Text
   , _author :: Text
   , _amznref :: Text
-  } deriving (Show, Eq)
+  } deriving (Generic, Show, Eq)
+
+instance FromJSON Book
+instance ToJSON Book
 
 allPeople :: [Person]
 allPeople =
diff --git a/lore/Biz/Ibb/Move.hs b/lore/Biz/Ibb/Move.hs
index 9ff9b34..291e015 100644
--- a/lore/Biz/Ibb/Move.hs
+++ b/lore/Biz/Ibb/Move.hs
@@ -1,12 +1,42 @@
+{-# LANGUAGE NoImplicitPrelude #-}
+{-# LANGUAGE OverloadedStrings #-}
 
 -- | App update logic
 module Biz.Ibb.Move (
-    module X
+    module Core
   , move
+  -- * Server interactions
+  , fetchPeople
   ) where
 
-import Biz.Ibb.Core as X
+import Alpha
+import Data.Aeson
+import Biz.Ibb.Influencers (Person)
+import Biz.Ibb.Core as Core
+import JavaScript.Web.XMLHttpRequest (Request(..), Method(GET), RequestData(NoData), contents, xhrByteString)
 import Miso
+import Miso.String
 
 move :: Action -> Model -> Effect Action Model
-move Nop m = undefined
+move Nop m = noEff m
+move (HandleRoute u) m = m { uri = u } <# pure Nop
+move (ChangeRoute u) m = m <# do pushURI u >> pure Nop
+move FetchPeople m = m <# do SetPeople /@ fetchPeople
+move (SetPeople ps) m = noEff m { people = ps }
+
+fetchPeople :: IO (WebData [Person])
+fetchPeople = do
+  mjson <- contents /@ xhrByteString req
+  case mjson of
+    Nothing -> pure $ Failure "could not read from server"
+    Just json -> pure
+      $ either (Failure . ms) Core.Success
+      $ eitherDecodeStrict json
+  where
+    req = Request { reqMethod = GET
+                  , reqURI = "/api/people" -- FIXME: can replace this hardcoding with a function?
+                  , reqLogin = Nothing
+                  , reqHeaders = []
+                  , reqWithCredentials = False
+                  , reqData = NoData
+                  }
-- 
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