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1 files changed, 102 insertions, 0 deletions

diff --git a/client/src/View/Statistics/Chart.hs b/client/src/View/Statistics/Chart.hs
new file mode 100644
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+++ b/client/src/View/Statistics/Chart.hs
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+{-# LANGUAGE CPP           #-}
+{-# LANGUAGE JavaScriptFFI #-}
+
+module View.Statistics.Chart
+  ( view
+  , In(..)
+  , Dataset(..)
+  ) where
+
+import qualified Control.Concurrent                as Concurrent
+import           Control.Monad                     (void)
+import           Control.Monad.IO.Class            (liftIO)
+import           Data.Aeson                        ((.=))
+import qualified Data.Aeson                        as AE
+import qualified Data.Map                          as M
+import           Data.Text                         (Text)
+import           Language.Javascript.JSaddle       (JSString, JSVal)
+import qualified Language.Javascript.JSaddle.Value as JSValue
+import           Reflex.Dom                        (MonadWidget)
+import qualified Reflex.Dom                        as R
+-- import GHCJS.Foreign.Callback
+
+
+#ifdef __GHCJS__
+foreign import javascript unsafe "new Chart(document.getElementById($1), $2);" drawChart :: JSString -> JSVal -> IO ()
+#else
+drawChart = error "drawChart: only available from JavaScript"
+#endif
+
+data In = In
+  { _in_title    :: Text
+  , _in_labels   :: [Text]
+  , _in_datasets :: [Dataset]
+  }
+
+data Dataset = Dataset
+  { _dataset_label :: Text
+  , _dataset_data  :: [Int]
+  , _dataset_color :: Text
+  }
+
+view :: forall t m. MonadWidget t m => In -> m ()
+view input = do
+  R.divClass "g-Chart" $
+    R.elAttr "canvas" (M.singleton "id" "chart") $
+      R.blank
+
+  liftIO $ Concurrent.forkIO $ do
+    Concurrent.threadDelay 500000
+    config <- JSValue.valMakeJSON (configToJson input)
+    drawChart "chart" config
+
+  return ()
+
+configToJson (In title labels datasets) =
+  AE.object
+    [ "type" .= AE.String "line"
+    , "data" .=
+      AE.object
+        [ "labels" .= labels
+        , "datasets" .= map datasetToJson datasets
+        ]
+    , "options" .=
+      AE.object
+        [ "responsive" .= True
+        , "title" .=
+          AE.object
+            [ "display" .= True
+            , "text" .= title
+            ]
+        , "tooltips" .=
+          AE.object
+            [ "mode" .= AE.String "nearest"
+            , "intersect" .= False
+            ]
+        , "hover" .=
+          AE.object
+            [ "mode" .= AE.String "nearest"
+            , "intersect" .= True
+            ]
+        , "scales" .=
+          AE.object
+            [ "yAxes" .=
+              [ [ AE.object
+                  [ "ticks" .=
+                    AE.object
+                      [ "beginAtZero" .= True ]
+                  ]
+                ]
+              ]
+            ]
+        ]
+      ]
+
+datasetToJson (Dataset label data_ color) =
+  AE.object
+    [ "label" .= label
+    , "data" .= data_
+    , "fill" .= False
+    , "backgroundColor" .= color
+    , "borderColor" .= color
+    ]