From 9e6cf2f2f15b3fef1f99a2fcf980eb96945dc936 Mon Sep 17 00:00:00 2001
From: Joris Guyonvarch
Date: Sat, 21 Mar 2015 12:33:58 +0100
Subject: Cannot delete a timer if it is the last one

---
 design/design.css     |  4 ++++
 src/Model/Model.elm   |  5 +++++
 src/Update/Update.elm |  6 +++++-
 src/View/Timer.elm    | 20 ++++++++++++--------
 4 files changed, 26 insertions(+), 9 deletions(-)

diff --git a/design/design.css b/design/design.css
index 681e770..159353c 100644
--- a/design/design.css
+++ b/design/design.css
@@ -87,6 +87,10 @@
   color: #AA2222;
 }
 
+.timers button.singleRemove {
+  color: grey;
+}
+
 .timer:not(last-child) {
   margin-bottom: 20px;
 }
diff --git a/src/Model/Model.elm b/src/Model/Model.elm
index b7ac48a..ad1e9da 100644
--- a/src/Model/Model.elm
+++ b/src/Model/Model.elm
@@ -2,11 +2,13 @@ module Model.Model
   ( Model
   , initialModel
   , substractTimersTime
+  , numberOfTimers
   ) where
 
 import Dict (Dict)
 import Dict
 import Time (Time)
+import List
 
 import Model.Timer (..)
 import Model.TimerEdition (..)
@@ -33,3 +35,6 @@ initialModel initialTime =
 substractTimersTime : Time -> Dict Id Timer -> Dict Id Timer
 substractTimersTime t timers =
   Dict.map (\id timer -> substractTimerTime t timer) timers
+
+numberOfTimers : Model -> Int
+numberOfTimers = List.length << Dict.toList << .timers
diff --git a/src/Update/Update.elm b/src/Update/Update.elm
index c6c5f32..2cb45cb 100644
--- a/src/Update/Update.elm
+++ b/src/Update/Update.elm
@@ -76,7 +76,11 @@ update action model =
             Nothing ->
               { model | timers <- Dict.update id (Maybe.map (updateTimer action)) model.timers }
     RemoveTimer id ->
-      { model | timers <- Dict.remove id model.timers }
+      if numberOfTimers model > 1
+        then
+          { model | timers <- Dict.remove id model.timers }
+        else
+          model
     EditTimer id ->
       { model
       | timerEdition <- Just (newTimerEdition id)
diff --git a/src/View/Timer.elm b/src/View/Timer.elm
index 2325d3a..9c302a4 100644
--- a/src/View/Timer.elm
+++ b/src/View/Timer.elm
@@ -37,7 +37,7 @@ timerView model (id, timer) =
     , restartBlock (id, timer)
     , playPauseBlock (id, timer)
     , stopBlock (id, timer)
-    , removeBlock (id, timer)
+    , removeBlock model (id, timer)
     ]
 
 nameBlock : (Id, Timer) -> Html
@@ -105,13 +105,17 @@ stopBlock (id, timer) =
     ]
     [ i [ class "fa fa-fw fa-stop" ] [] ]
 
-removeBlock : (Id, Timer) -> Html
-removeBlock (id, timer) =
-  button
-    [ class <| "remove block"
-    , onClick (Signal.send updates (RemoveTimer id))
-    ]
-    [ i [ class "fa fa-fw fa-remove" ] [] ]
+removeBlock : Model -> (Id, Timer) -> Html
+removeBlock model (id, timer) =
+  let removeClass =
+        if numberOfTimers model > 1
+          then "remove"
+          else "singleRemove"
+  in  button
+        [ class <| "block " ++ removeClass
+        , onClick (Signal.send updates (RemoveTimer id))
+        ]
+        [ i [ class "fa fa-fw fa-remove" ] [] ]
 
 stopIfRinging : (Id, Timer) -> Signal.Message -> Signal.Message
 stopIfRinging (id, timer) message =
-- 
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