add mock recommender service for development, add user-context recommended posts

app/assets/javascripts/posts.js.erb

@@ -452,6 +452,9 @@
         $("#edit").hide();
         $("#share").hide();
         $("#recommended").show();
+        $.get("/recommended_posts", {context: "post", post_id: Danbooru.meta("post-id")}, function(data) {
+          $("#recommended").html(data);
+        });
       } else {
         $("#edit").hide();
         $("#comments").hide();

app/controllers/recommended_posts_controller.rb

@@ -0,0 +1,23 @@
+class RecommendedPostsController < ApplicationController
+  before_action :member_only
+  respond_to :html
+
+  def show
+    @posts = load_posts()
+
+    if request.xhr?
+      render partial: "show", layout: false
+    end
+  end
+
+private
+
+  def load_posts
+    if params[:context] == "post"
+      @posts = RecommenderService.recommend(post_id: params[:post_id])
+
+    elsif params[:context] == "user"
+      @posts = RecommenderService.recommend(user_id: CurrentUser.id)
+    end
+  end
+end

app/logical/post_sets/recommended.rb

@@ -1,16 +1,10 @@
 module PostSets
   class Recommended < PostSets::Post
-    def initialize(post)
+    attr_reader :posts
+    
+    def initialize(posts)
       super("")
-      @post = post
-    end
-
-    def posts
-      @posts ||= begin
-        response = RecommenderService.similar(@post)
-        post_ids = response.reject {|x| x[0] == @post.id}.slice(0, 6).map {|x| x[0]}
-        ::Post.find(post_ids)
-      end
+      @posts = posts
     end
 
     def presenter

app/models/recommender_service.rb

@@ -1,25 +1,26 @@
 module RecommenderService
   extend self
 
-  SCORE_THRESHOLD = 10
+  SCORE_THRESHOLD = 5
 
   def enabled?
     Danbooru.config.recommender_server.present?
   end
 
-  def available?(post)
+  def available_for_post?(post)
     return true if Rails.env.development?
+
     enabled? && CurrentUser.enable_recommended_posts? && post.created_at > Date.civil(2018, 1, 1) && post.score >= SCORE_THRESHOLD
   end
 
-  def similar(post)
-    if Danbooru.config.recommender_server == "development"
-      return Post.order("random()").limit(6).map {|x| [x.id, "1.000"]}
-    end
+  def available_for_user?
+    enabled? && CurrentUser.is_gold?
+  end
 
-    Cache.get("rss:#{post.id}", 1.day) do
+  def recommend_for_user(user_id)
+    ids = Cache.get("rsu:#{user_id}", 1.day) do
       resp = HTTParty.get(
-        "#{Danbooru.config.recommender_server}/similar/#{post.id}", 
+        "#{Danbooru.config.recommender_server}/recommend/#{user_id}", 
         Danbooru.config.httparty_options.merge(
           basic_auth: {
             username: "danbooru", 
@@ -29,5 +30,30 @@ module RecommenderService
       )
       JSON.parse(resp.body)
     end
+    Post.find(ids.map(&:first))
+  end
+
+  def recommend_for_post(post_id)
+    ids = Cache.get("rss:#{post_id}", 1.day) do
+      resp = HTTParty.get(
+        "#{Danbooru.config.recommender_server}/similar/#{post_id}", 
+        Danbooru.config.httparty_options.merge(
+          basic_auth: {
+            username: "danbooru", 
+            password: Danbooru.config.recommender_key
+          }
+        )
+      )
+      JSON.parse(resp.body)
+    end
+    Post.find(ids.reject {|x| x[0] == post_id}.map(&:first))
+  end
+
+  def recommend(post_id: nil, user_id: nil)
+    if post_id
+      recommend_for_post(post_id)
+    elsif user_id
+      recommend_for_user(user_id)
+    end
   end
 end

app/views/posts/partials/common/_secondary_links.html.erb

@@ -3,6 +3,9 @@
     <li><%= link_to "Listing", posts_path %></li>
     <li id="secondary-links-posts-upload" class="nonessential"><%= link_to "Upload", new_upload_path %></li>
     <li id="secondary-links-posts-hot"><%= link_to "Hot", posts_path(:tags => "order:rank", :d => "1") %></li>
+    <% if RecommenderService.available_for_user? %>
+      <li><%= link_to "Recommended", recommended_posts_path(context: "user") %></li>
+    <% end %>
     <% unless CurrentUser.is_anonymous? %>
       <li id="secondary-links-posts-favorites"><%= link_to "Favorites", favorites_path %></li>
       <li id="secondary-links-posts-favorite-groups"><%= link_to "Fav groups", favorite_groups_path %></li>

app/views/posts/show.html.erb

@@ -89,7 +89,7 @@
       <menu id="post-sections">
         <li><a href="#comments">Comments</a></li>
 
-        <% if RecommenderService.enabled? %>
+        <% if RecommenderService.available_for_post?(@post) %>
           <li><a href="#recommended">Recommended</a></li>
         <% end %>
 
@@ -100,13 +100,11 @@
         <li><a href="#share">Share</a></li>
       </menu>
 
-      <section id="recommended" data-available="<%= RecommenderService.available?(@post) %>">
-        <% if RecommenderService.available?(@post) %>
-          <%= render "posts/partials/index/recommended", post: @post %>
-        <% else %>
-          <p><em>Not enough data available</em></p>
-        <% end %>
-      </section>
+      <% if RecommenderService.available_for_post?(@post) %>
+        <section id="recommended">
+          <p><em>Loading...</em></p>
+        </section>
+      <% end %>
 
       <section id="comments">
         <% if !CurrentUser.user.is_builder? %>

app/views/recommended_posts/_show.html.erb

@@ -0,0 +1,3 @@
+<section class="recommended-posts user-disable-cropped-<%= Danbooru.config.enable_image_cropping && CurrentUser.user.disable_cropped_thumbnails? %>">
+  <%= PostSets::Recommended.new(@posts).presenter.post_previews_html(self) %>
+</section>

app/views/recommended_posts/show.html.erb

@@ -0,0 +1,15 @@
+<div id="c-posts">
+  <div id="a-index">
+    <h1>Recommended Posts</h1>
+
+    <p>Based on your voting history, you may enjoy these posts. Vote more to get more accurate results. These recommendations update every hour.</p>
+
+    <%= render partial: "show" %> 
+  </div>
+</div>
+
+<%= render "posts/partials/common/secondary_links" %>
+
+<% content_for(:page_title) do %>
+  Recommended Posts - <%= Danbooru.config.app_name %>
+<% end %>