Sort table by clicking on the header

4 files changed, 107 insertions, 29 deletions

diff --git a/src/Food.purs b/src/Food.purs
index 8a6bb57..2ced271 100644
--- a/src/Food.purs
+++ b/src/Food.purs
@@ -13,8 +13,6 @@ type Aliment =
   , carbohydrates :: Int -- for 100 grams
   }
 
--- let @a = 'I  , { name: "A", glycemicIndex: TDTf	Xdf	i, carbohydrates: f	XL }t^'
-
 glycemicLoad :: Aliment -> Number
 glycemicLoad aliment = toNumber aliment.glycemicIndex * toNumber aliment.carbohydrates / 100.0
 
@@ -63,7 +61,7 @@ all =
   , { name: "Choux romanesco", glycemicIndex: 15, carbohydrates: 2 }
   , { name: "Choux rouge", glycemicIndex: 15, carbohydrates: 7 }
   , { name: "Choux vert", glycemicIndex: 15, carbohydrates: 1 }
-  , { name: "citron", glycemicIndex: 20, carbohydrates: 3 }
+  , { name: "Citron", glycemicIndex: 20, carbohydrates: 3 }
   , { name: "Citron vert", glycemicIndex: 20, carbohydrates: 7 }
   , { name: "Citrouille", glycemicIndex: 80, carbohydrates: 6 }
   , { name: "Clémentine", glycemicIndex: 30, carbohydrates: 9 }
@@ -164,6 +162,7 @@ all =
   , { name: "Nectar de mangue", glycemicIndex: 50, carbohydrates: 12 }
   , { name: "Nectarine", glycemicIndex: 35, carbohydrates: 13 }
 
+  , { name: "Noisette", glycemicIndex: 25, carbohydrates: 17 }
   , { name: "Noix de cajou", glycemicIndex: 15, carbohydrates: 21 }
   , { name: "Noix de coco", glycemicIndex: 35, carbohydrates: 10 }
   , { name: "Noix de coco râpée", glycemicIndex: 35, carbohydrates: 12 }
@@ -181,7 +180,7 @@ all =
   , { name: "Pain aux raisins", glycemicIndex: 70, carbohydrates: 46 }
   , { name: "Pain au chocolat", glycemicIndex: 65, carbohydrates: 49 }
   , { name: "Pain complet", glycemicIndex: 65, carbohydrates: 44 }
-  , { name: "pain hamburger complet", glycemicIndex: 48, carbohydrates: 48 }
+  , { name: "Pain hamburger complet", glycemicIndex: 48, carbohydrates: 48 }
   , { name: "Pastèque", glycemicIndex: 75, carbohydrates: 7 }
   , { name: "Pâte", glycemicIndex: 70, carbohydrates: 20 }
   , { name: "Pâte de fruit", glycemicIndex: 70, carbohydrates: 53 }
diff --git a/src/Main.purs b/src/Main.purs
index 85346b3..6c7fe42 100644
--- a/src/Main.purs
+++ b/src/Main.purs
@@ -12,4 +12,4 @@ import Page as Page
 main :: Eff (HA.HalogenEffects ()) Unit
 main = HA.runHalogenAff do
   body <- HA.awaitBody
-  runUI Page.component "" body
+  runUI Page.component Page.init body
diff --git a/src/Order.purs b/src/Order.purs
new file mode 100644
index 0000000..33c2be9
--- /dev/null
+++ b/src/Order.purs
@@ -0,0 +1,54 @@
+module Order
+  ( Order
+  , OrderKind(..)
+  , OrderDirection(..)
+  , init
+  , select
+  ) where
+
+import Prelude (class Eq, (==))
+import Data.Generic (class Generic, gEq)
+
+type Order =
+  { kind :: OrderKind
+  , direction :: OrderDirection
+  }
+
+data OrderKind =
+  Name
+  | GlycemicIndex
+  | Carbohydrates
+  | GlycemicLoad
+
+derive instance genericOrderKind :: Generic OrderKind
+
+instance eqOrderKind :: Eq OrderKind where
+  eq = gEq
+
+data OrderDirection =
+  Ascending
+  | Descending
+
+derive instance genericOrderDirection :: Generic OrderDirection
+
+instance eqOrderDirection :: Eq OrderDirection where
+  eq = gEq
+
+init :: Order
+init =
+  { kind: Name
+  , direction: initDirection
+  }
+
+select :: OrderKind -> Order -> Order
+select kind order =
+  if order.kind == kind
+    then order { direction = otherDirection order.direction }
+    else order { kind = kind, direction = initDirection }
+
+otherDirection :: OrderDirection -> OrderDirection
+otherDirection Ascending = Descending
+otherDirection Descending = Ascending
+
+initDirection :: OrderDirection
+initDirection = Ascending
diff --git a/src/Page.purs b/src/Page.purs
index f7c04c2..40c8ddc 100644
--- a/src/Page.purs
+++ b/src/Page.purs
@@ -1,10 +1,11 @@
 module Page
   ( component
   , Query
+  , init
   ) where
 
 import Control.Monad.Aff (Aff)
-import Data.Array (sortBy, filter)
+import Data.Array (sortBy, filter, reverse)
 import Data.Maybe (Maybe(..))
 import Data.String (contains, Pattern(..))
 import DOM (DOM)
@@ -18,19 +19,30 @@ import Food (Aliment)
 import Food as Food
 import Format as Format
 import Indicator as Indicator
+import Order (Order, OrderKind)
+import Order as Order
 
 data Query a =
-  NoOp a
-  | UpdateSearch String a
+  UpdateSearch String a
+  | SelectOrder OrderKind a
 
-type State = String
+type State =
+  { search :: String
+  , order :: Order
+  }
+
+init :: State
+init =
+  { search: ""
+  , order: Order.init
+  }
 
 type Message = Unit
 
 component :: forall eff. H.Component HH.HTML Query State Message (Aff (dom :: DOM | eff))
 component =
   H.component
-    { initialState: const ""
+  { initialState: const init
     , render
     , eval
     , receiver: const Nothing
@@ -40,41 +52,46 @@ component =
     render state =
       HH.div
         [ HP.class_ $ HH.ClassName "page" ]
-        [ renderHeader state
+        [ renderHeader state.order.kind state.search
         , HH.div
             [ HP.class_ $ HH.ClassName "aliments" ]
             ( Food.all
-                # filter (\a -> contains (Pattern $ Format.string state) (Format.string a.name))
-                # sortBy (\a b -> compare (Format.string a.name) (Format.string b.name))
+                # filter (\a -> contains (Pattern $ Format.string state.search) (Format.string a.name))
+                # sortBy compareAliments
+                # (if state.order.direction == Order.Ascending then id else reverse)
                 # map renderAliment
             )
         ]
+      where
+        compareAliments :: Aliment -> Aliment -> Ordering
+        compareAliments a b =
+          case state.order.kind of
+            Order.Name -> compare (Format.string a.name) (Format.string b.name)
+            Order.GlycemicIndex -> compare a.glycemicIndex b.glycemicIndex
+            Order.Carbohydrates -> compare a.carbohydrates b.carbohydrates
+            Order.GlycemicLoad -> compare (Food.glycemicLoad a) (Food.glycemicLoad b)
 
     eval :: Query ~> H.ComponentDSL State Query Message (Aff (dom :: DOM | eff))
     eval = case _ of
-      NoOp next -> pure next
       UpdateSearch search next -> do
-        H.put search
+        state <- H.get
+        H.put $ state { search = search }
+        pure next
+      SelectOrder kind next -> do
+        state <- H.get
+        H.put $ state { order = Order.select kind state.order }
         pure next
 
-renderHeader :: String -> H.ComponentHTML Query
-renderHeader search =
+renderHeader :: OrderKind -> String -> H.ComponentHTML Query
+renderHeader orderKind search =
   HH.div
     [ HP.class_ $ HH.ClassName "header" ]
     [ HH.div
         [ HP.class_ $ HH.ClassName "title line" ]
-        [ HH.div
-            []
-            [ HH.text "Aliment" ]
-        , HH.div
-            []
-            [ HH.text "Index glycémique" ]
-        , HH.div
-            []
-            [ HH.text "Glucides pour 100 g" ]
-        , HH.div
-            []
-            [ HH.text "Charge glycémique" ]
+        [ button Order.Name "Aliment"
+        , button Order.GlycemicIndex "Index glycémique"
+        , button Order.Carbohydrates "Glucides pour 100 g"
+        , button Order.GlycemicLoad "Charge glycémique"
         ]
     , HH.input
         [ HP.class_ $ HH.ClassName "search line"
@@ -83,6 +100,14 @@ renderHeader search =
         , HP.value search
         ]
     ]
+  where
+    button :: OrderKind -> String -> H.ComponentHTML Query
+    button kind label =
+      HH.button
+        [ HE.onClick (HE.input_ (SelectOrder kind))
+        , HP.class_ $ HH.ClassName (if orderKind == kind then "sorted"  else "")
+        ]
+        [ HH.text label ]
 
 renderAliment :: Aliment -> H.ComponentHTML Query
 renderAliment aliment =