posts: make post votes work the same way as comment votes.

Change post votes to work the same way as comment votes:

* Make the upvote arrow blue if you've upvoted the post, or grey if you
  haven't. Likewise for the downvote arrow.
* Make it so you can click the upvote or downvote arrows to undo the vote.
* Don't show any notices when you vote on a post.

Also fix it so that votes work the same way on the posts page, the
comments page, and in the modqueue. Before it wasn't possible to undo
votes on the comments page or in the modqueue.

app/components/application_component.rb

@@ -1,4 +1,8 @@
 class ApplicationComponent < ViewComponent::Base
+  delegate :link_to_user, :time_ago_in_words_tagged, :format_text, :edit_icon,
+    :delete_icon, :undelete_icon, :flag_icon, :upvote_icon, :downvote_icon,
+    :link_icon, to: :helpers
+
   def policy(subject)
     Pundit.policy!(current_user, subject)
   end

app/components/post_votes_component.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+# This component represents the post score and upvote/downvote buttons ("🠉 5 🠋")
+class PostVotesComponent < ApplicationComponent
+  attr_reader :post, :current_user
+
+  def initialize(post:, current_user:)
+    @post = post
+    @current_user = current_user
+  end
+
+  def can_vote?
+    policy(PostVote).create?
+  end
+
+  def current_vote
+    post.votes.find_by(user: current_user)
+  end
+
+  def upvoted?
+    can_vote? && current_vote&.is_positive?
+  end
+
+  def downvoted?
+    can_vote? && current_vote&.is_negative?
+  end
+end

app/components/post_votes_component/post_votes_component.html.erb

@@ -0,0 +1,19 @@
+<span class="post-votes" data-id="<%= post.id %>">
+  <% if can_vote? %>
+    <% if upvoted? %>
+      <%= link_to upvote_icon, post_post_votes_path(post_id: post.id), class: "post-upvote-link post-unvote-link active-link", method: :delete, remote: true %>
+    <% else %>
+      <%= link_to upvote_icon, post_post_votes_path(post_id: post.id, score: "up"), class: "post-upvote-link inactive-link", method: :post, remote: true %>
+    <% end %>
+  <% end %>
+
+  <span class="post-score"><%= post.score %></span>
+
+  <% if can_vote? %>
+    <% if downvoted? %>
+      <%= link_to downvote_icon, post_post_votes_path(post_id: post.id), class: "post-downvote-link post-unvote-link active-link", method: :delete, remote: true %>
+    <% else %>
+      <%= link_to downvote_icon, post_post_votes_path(post_id: post.id, score: "down"), class: "post-downvote-link inactive-link", method: :post, remote: true %>
+    <% end %>
+  <% end %>
+</span>

app/components/post_votes_component/post_votes_component.scss

@@ -0,0 +1,10 @@
+.post-votes {
+  // Fix it so that the vote buttons don't move when the score changes width.
+  // XXX duplicated from app/components/comment_component/comment_component.scss
+  .post-score {
+    display: inline-block;
+    text-align: center;
+    min-width: 1.25em;
+    white-space: nowrap;
+  }
+}

app/helpers/components_helper.rb

@@ -14,4 +14,8 @@ module ComponentsHelper
   def render_comment_section(post, **options)
     render CommentSectionComponent.new(post: post, **options)
   end
+
+  def render_post_votes(post, **options)
+    render PostVotesComponent.new(post: post, **options)
+  end
 end

app/models/post_vote.rb

@@ -33,6 +33,14 @@ class PostVote < ApplicationRecord
     end
   end
 
+  def is_positive?
+    score > 0
+  end
+
+  def is_negative?
+    score < 0
+  end
+
   def update_post_on_create
     if score > 0
       Post.where(:id => post_id).update_all("score = score + #{score}, up_score = up_score + #{score}")

app/views/comments/partials/index/_header.html.erb

@@ -14,12 +14,7 @@
     </span>
     <span class="info">
       <strong>Score</strong>
-      <span>
-        <span id="score-for-post-<%= post.id %>"><%= post.score %></span>
-        <% if policy(PostVote).create? %>
-          (vote <%= link_to upvote_icon, post_post_votes_path(score: "up", post_id: post.id), remote: true, method: :post %>/<%= link_to downvote_icon, post_post_votes_path(score: "down", post_id: post.id), remote: true, method: :post %>)
-        <% end %>
-      </span>
+      <%= render_post_votes post, current_user: CurrentUser.user %>
     </span>
   </div>
   <div class="row list-of-tags">

app/views/favorites/_update.js.erb

@@ -1,17 +1,9 @@
 $("#add-to-favorites, #add-fav-button, #remove-from-favorites, #remove-fav-button").toggle();
 $("#remove-fav-button").addClass("animate");
-$("#score-for-post-<%= @post.id %>").text(<%= @post.score %>);
+$("span.post-votes[data-id=<%= @post.id %>]").replaceWith("<%= j render_post_votes @post, current_user: CurrentUser.user %>");
 $("#favcount-for-post-<%= @post.id %>").text(<%= @post.fav_count %>);
 $(".fav-buttons").toggleClass("fav-buttons-false").toggleClass("fav-buttons-true");
 
-<% if @post.can_be_voted_by?(CurrentUser.user) %>
-  $("#vote-links-for-post-<%= @post.id %>").show();
-  $("#unvote-link-for-post-<%= @post.id %>").hide();
-<% else %>
-  $("#vote-links-for-post-<%= @post.id %>").hide();
-  $("#unvote-link-for-post-<%= @post.id %>").show();
-<% end %>
-
 <% if policy(@post).can_view_favlist? %>
   var fav_count = <%= @post.fav_count %>;
   $("#favlist").html("<%= j render "posts/partials/show/favorite_list", post: @post %>");

app/views/modqueue/_post.html.erb

@@ -28,12 +28,7 @@
 
       <span class="info">
         <strong>Score</strong>
-        <span>
-          <span id="score-for-post-<%= post.id %>"><%= post.score %></span>
-          <% if policy(PostVote).create? %>
-            (vote <%= link_to upvote_icon, post_post_votes_path(score: "up", post_id: post.id), remote: true, method: :post %>/<%= link_to downvote_icon, post_post_votes_path(score: "down", post_id: post.id), remote: true, method: :post %>)
-          <% end %>
-        </span>
+        <%= render_post_votes post, current_user: CurrentUser.user %>
       </span>
     </div>
 

app/views/post_votes/create.js.erb

@@ -1,5 +1 @@
-Danbooru.Utility.notice("Vote saved");
-$("#score-for-post-<%= @post.id %>").html(<%= @post.score %>);
-
-$("#vote-links-for-post-<%= @post.id %>").hide();
-$("#unvote-link-for-post-<%= @post.id %>").show();
+$("span.post-votes[data-id=<%= @post.id %>]").replaceWith("<%= j render_post_votes @post, current_user: CurrentUser.user %>");

app/views/post_votes/destroy.js.erb

@@ -1,5 +0,0 @@
-Danbooru.Utility.notice("Unvoted successfully");
-$("#score-for-post-<%= @post.id %>").html(<%= @post.score %>);
-
-$("#vote-links-for-post-<%= @post.id %>").show();
-$("#unvote-link-for-post-<%= @post.id %>").hide();

app/views/post_votes/destroy.js.erb

@@ -0,0 +1 @@
+create.js.erb

app/views/posts/partials/show/_information.html.erb

@@ -21,17 +21,8 @@
   </li>
   <li id="post-info-source">Source: <%= post_source_tag(post.source, post.normalized_source) %></li>
   <li id="post-info-rating">Rating: <%= post.pretty_rating %></li>
-  <li id="post-info-score">Score: <span id="score-for-post-<%= post.id %>"><%= post.score %></span>
-    <% if policy(PostVote).create? %>
-      <%= tag.span id: "vote-links-for-post-#{post.id}", style: ("display: none;" if !@post.can_be_voted_by?(CurrentUser.user)) do %>
-        (vote
-        <%= link_to upvote_icon, post_post_votes_path(post_id: post.id, score: "up"), remote: true, method: :post %>
-        <%= link_to downvote_icon, post_post_votes_path(post_id: post.id, score: "down"), remote: true, method: :post %>)
-      <% end %>
-      <%= tag.span id: "unvote-link-for-post-#{post.id}", style: ("display: none;" if @post.can_be_voted_by?(CurrentUser.user)) do %>
-        (<%= link_to "undo vote", post_post_votes_path(post), remote: true, method: :delete, class: "unvote-post-link" %>)
-      <% end %>
-    <% end %>
+  <li id="post-info-score">
+    Score: <%= render_post_votes post, current_user: CurrentUser.user %>
   </li>
   <li id="post-info-favorites">Favorites: <span id="favcount-for-post-<%= post.id %>"><%= post.fav_count %></span>
     <% if policy(post).can_view_favlist? %>

test/components/post_votes_component_test.rb

@@ -0,0 +1,56 @@
+require "test_helper"
+
+class PostVotesComponentTest < ViewComponent::TestCase
+  def render_post_votes(post, current_user:)
+    render_inline(PostVotesComponent.new(post: post, current_user: current_user))
+  end
+
+  context "The PostVotesComponent" do
+    setup do
+      @post = as(create(:user)) { create(:post) }
+    end
+
+    context "for a user who can't vote" do
+      should "not show the vote buttons" do
+        render_post_votes(@post, current_user: User.anonymous)
+
+        assert_css(".post-score")
+        assert_no_css(".post-upvote-link")
+        assert_no_css(".post-downvote-link")
+      end
+    end
+
+    context "for a user who can vote" do
+      setup do
+        @user = create(:gold_user)
+      end
+
+      should "show the vote buttons" do
+        render_post_votes(@post, current_user: @user)
+
+        assert_css(".post-upvote-link.inactive-link")
+        assert_css(".post-downvote-link.inactive-link")
+      end
+
+      context "for a downvoted post" do
+        should "highlight the downvote button as active" do
+          @post.vote!("down", @user)
+          render_post_votes(@post, current_user: @user)
+
+          assert_css(".post-upvote-link.inactive-link")
+          assert_css(".post-downvote-link.active-link")
+        end
+      end
+
+      context "for an upvoted post" do
+        should "highlight the upvote button as active" do
+          @post.vote!("up", @user)
+          render_post_votes(@post, current_user: @user)
+
+          assert_css(".post-upvote-link.active-link")
+          assert_css(".post-downvote-link.inactive-link")
+        end
+      end
+    end
+  end
+end