Restrict offline participation to single-puzzle

contests

app/policies/contest_policy.rb

@@ -48,7 +48,7 @@ class ContestPolicy < ApplicationPolicy
   end
 
   def offline?
-    record.offline_form
+    record.offline_form && record.puzzles.length < 2
   end
 
   def offline_new?

app/views/contests/_form.html.slim

@@ -17,9 +17,18 @@ h4.mt-5 = t("contests.form.general")
         = form.label :public
   .row.mb-3
     .col
-      .form-check.form-switch
-        = form.check_box :offline_form, class: "form-check-input"
-        = form.label :offline_form
+      - if @contest.puzzles.length <= 1
+        .form-check.form-switch
+          = form.check_box :offline_form, class: "form-check-input"
+          = form.label :offline_form
+          .form-text = t("activerecord.attributes.contest.offline_form_warning")
+          .form-text = t("activerecord.attributes.contest.offline_form_description")
+      - else
+        .form-check.form-switch
+          = form.check_box :offline_form_fake, class: "form-check-input", disabled: true
+          = form.label :offline_form
+          .form-text = t("activerecord.attributes.contest.offline_form_warning")
+          .form-text = t("activerecord.attributes.contest.offline_form_description")
   .row.mb-3
     .col
       .form-check.form-switch

app/views/contests/_selectors.html.slim

@@ -29,7 +29,7 @@ javascript:
         categorySelectEl.addEventListener('change', (e) => {
           updateParams();
         })
-- if @contest.offline_form
+- if @contest.offline_form && @contest.puzzles.length < 2
   .row
     .col
       input type="checkbox" id="offline" style="padding: 5px;"

app/views/contests/scoreboard.html.slim

@@ -68,7 +68,7 @@ css:
       - @contest.puzzles.each do |puzzle|
         = image_tag(puzzle.image, class: "img-fluid ms-3 me-3", style: "max-height: 220px") if puzzle.image.attached?
 
-    = render "category_selector"
+    = render "selectors"
 
     .d-flex.flex-column style="overflow-y: auto"
       table.table.table-striped.table-hover

app/views/contests/show.html.slim

@@ -20,7 +20,7 @@ javascript:
     - else
       a.btn.btn-success.disabled
         = t("contests.show.public_scoreboard_disabled")
-    - if @contest.offline_form
+    - if @contest.offline_form && @contest.puzzles.length < 2
       a.ms-3.btn.btn-success href="/public/#{@contest.slug}/offline"
         = t("contests.show.open_offline_form")
     - else