#302

backend/AGENTS.md

@@ -83,6 +83,10 @@ service, representation, and spec.
   by 4 spaces.
 - Put one logical pair per line when the expression would otherwise become
   dense.
+- For Ruby arrays, never put whitespace or a line break immediately before `]`.
+- Keep the first element on the same line as `[` by default.
+- If an array would exceed the line limit, break after `[` and indent
+  elements by 4 spaces.
 - For Ruby blocks, use 2-space indentation for the block body.
 - Keep comments short and useful; avoid narrating obvious code.
 - Do not add production dependencies without approval.

backend/app/services/theatre_post_selector.rb

@@ -1,5 +1,10 @@
 class TheatrePostSelector
   Candidate = Struct.new(:post, :weight, :penalty, :tags, keyword_init: true)
+  ELIGIBLE_POST_URL_CONDITION =
+      ["url LIKE '%nicovideo.jp%'",
+       "url LIKE '%youtube.com/watch%'",
+       "url LIKE '%youtu.be/%'"]
+      .join(' OR ')
 
   def initialize theatre:
     @theatre = theatre
@@ -52,7 +57,7 @@ class TheatrePostSelector
   end
 
   def eligible_posts
-    posts = Post.where("url LIKE '%nicovideo.jp%'")
+    posts = Post.where(ELIGIBLE_POST_URL_CONDITION)
     posts = posts.where.not(id: theatre.current_post_id) if theatre.current_post_id
     posts
   end

backend/spec/requests/theatres_spec.rb

@@ -28,6 +28,13 @@ RSpec.describe 'Theatres API', type: :request do
     )
   end
 
+  let!(:youtube_post) do
+    Post.create!(
+      title: 'youtube post',
+      url: 'https://www.youtube.com/watch?v=yt123'
+    )
+  end
+
   let!(:other_post) do
     Post.create!(
       title: 'other post',
@@ -286,7 +293,7 @@ RSpec.describe 'Theatres API', type: :request do
           .to change { theatre.reload.current_post_id }
 
         expect(response).to have_http_status(:no_content)
-        expect([niconico_post.id, second_niconico_post.id])
+        expect([niconico_post.id, second_niconico_post.id, youtube_post.id])
           .to include(theatre.reload.current_post_id)
         expect(theatre.reload.current_post_started_at)
           .to be_within(1.second).of(Time.current)
@@ -294,10 +301,27 @@ RSpec.describe 'Theatres API', type: :request do
       end
     end
 
+    context 'when only a YouTube post is eligible' do
+      before do
+        niconico_post.destroy!
+        second_niconico_post.destroy!
+        theatre.update!(host_user: member)
+        sign_in_as(member)
+      end
+
+      it 'sets current_post to the YouTube post' do
+        do_request
+
+        expect(response).to have_http_status(:no_content)
+        expect(theatre.reload.current_post_id).to eq(youtube_post.id)
+      end
+    end
+
     context 'when current user is host and no eligible post exists' do
       before do
         niconico_post.destroy!
         second_niconico_post.destroy!
+        youtube_post.destroy!
         theatre.update!(
           host_user: member,
           current_post: other_post,