Add Today/Tomorrow tabs for price display

HTMX-powered tabs switch between today's and tomorrow's prices without
full page reload. Today tab is active by default.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/clj/pmagnus/elprice/web/routes/ui.clj

@@ -69,12 +69,35 @@
         (hour-block hour quarters))]
      [:p {:class "mt-2 text-sm text-gray-400"} "Not available yet"])])
 
-(defn- price-tables [query-fn]
-  (let [today    (prices/get-today-prices query-fn)
-        tomorrow (prices/get-tomorrow-prices query-fn)]
-    [:div {:id "price-tables"}
-     (price-table "Today — DK1" today)
-     (price-table "Tomorrow — DK1" tomorrow)]))
+(def ^:private tab-base
+  "px-4 py-2 font-medium text-sm rounded-t-lg border-2 border-b-0 ")
+
+(def ^:private tab-active
+  (str tab-base "border-blue-400 bg-white text-gray-900"))
+
+(def ^:private tab-inactive
+  (str tab-base "border-gray-200 bg-gray-100 text-gray-500 hover:text-gray-700 cursor-pointer"))
+
+(defn- tabs [active-tab]
+  [:div {:class "flex gap-1 mt-4"}
+   [:button {:class (if (= active-tab :today) tab-active tab-inactive)
+             :hx-get "/prices/today"
+             :hx-target "#price-content"
+             :hx-swap "innerHTML"}
+    "Today"]
+   [:button {:class (if (= active-tab :tomorrow) tab-active tab-inactive)
+             :hx-get "/prices/tomorrow"
+             :hx-target "#price-content"
+             :hx-swap "innerHTML"}
+    "Tomorrow"]])
+
+(defn- price-content [tab prices]
+  (let [title (if (= tab :today) "Today — DK1" "Tomorrow — DK1")]
+    [:div
+     (tabs tab)
+     [:div {:id "price-content"
+            :class "border-2 border-blue-400 rounded-b-lg rounded-tr-lg p-4 bg-white"}
+      (price-table title prices)]]))
 
 (defn home [query-fn request]
   (page {:lang "en"}
@@ -85,23 +108,34 @@
    [:button {:class "mt-4 rounded-lg bg-blue-600 px-4 py-2 text-white font-medium
                      active:bg-blue-700 transition-colors"
              :hx-post "/prices/fetch"
-             :hx-target "#price-tables"
-             :hx-swap "outerHTML"
+             :hx-target "#price-panel"
+             :hx-swap "innerHTML"
              :hx-indicator "#fetch-spinner"}
     "Refresh Prices"]
    [:span {:id "fetch-spinner"
            :class "ml-2 htmx-indicator text-sm text-gray-400"}
     "Loading..."]
-   (price-tables query-fn)))
+   [:div {:id "price-panel"}
+    (price-content :today (prices/get-today-prices query-fn))]))
+
+(defn prices-today [query-fn request]
+  (fragment
+   (price-table "Today — DK1" (prices/get-today-prices query-fn))))
+
+(defn prices-tomorrow [query-fn request]
+  (fragment
+   (price-table "Tomorrow — DK1" (prices/get-tomorrow-prices query-fn))))
 
 (defn fetch-prices [query-fn request]
   (prices/fetch-and-save! query-fn)
   (fragment
-   (price-tables query-fn)))
+   (price-content :today (prices/get-today-prices query-fn))))
 
 ;; Routes
 (defn ui-routes [{:keys [query-fn]}]
   [["/" {:get (partial home query-fn)}]
+   ["/prices/today" {:get (partial prices-today query-fn)}]
+   ["/prices/tomorrow" {:get (partial prices-tomorrow query-fn)}]
    ["/prices/fetch" {:post (partial fetch-prices query-fn)}]])
 
 (def route-data