Display FASP trends when enabled

This is a temporary measure. The end goal is to interleave
local and FASP trends for optimal UX.

app/controllers/api/v1/trends/links_controller.rb

@@ -29,9 +29,13 @@ class Api::V1::Trends::LinksController < Api::BaseController
   end
 
   def links_from_trends
-    scope = Trends.links.query.allowed.in_locale(content_locale)
-    scope = scope.filtered_for(current_account) if user_signed_in?
-    scope
+    if Fasp.capability_enabled?('trends')
+      Fasp::PreviewCardTrend.preview_cards(language: user_signed_in? ? current_user.chosen_languages : content_locale)
+    else
+      scope = Trends.links.query.allowed.in_locale(content_locale)
+      scope = scope.filtered_for(current_account) if user_signed_in?
+      scope
+    end
   end
 
   def next_path

app/controllers/api/v1/trends/statuses_controller.rb

@@ -27,9 +27,16 @@ class Api::V1::Trends::StatusesController < Api::BaseController
   end
 
   def statuses_from_trends
-    scope = Trends.statuses.query.allowed.in_locale(content_locale)
-    scope = scope.filtered_for(current_account) if user_signed_in?
-    scope
+    if Fasp.capability_enabled?('trends')
+      Fasp::StatusTrend.statuses(
+        language: user_signed_in? ? current_user.chosen_languages : content_locale,
+        filtered_for: current_account
+      )
+    else
+      scope = Trends.statuses.query.allowed.in_locale(content_locale)
+      scope = scope.filtered_for(current_account) if user_signed_in?
+      scope
+    end
   end
 
   def next_path

app/controllers/api/v1/trends/tags_controller.rb

@@ -27,9 +27,13 @@ class Api::V1::Trends::TagsController < Api::BaseController
   end
 
   def tags_from_trends
-    scope = Trends.tags.query.allowed.in_locale(content_locale)
-    scope = scope.filtered_for(current_account) if user_signed_in?
-    scope
+    if Fasp.capability_enabled?('trends')
+      Fasp::TagTrend.tags(language: user_signed_in? ? current_user.chosen_languages : content_locale)
+    else
+      scope = Trends.tags.query.allowed.in_locale(content_locale)
+      scope = scope.filtered_for(current_account) if user_signed_in?
+      scope
+    end
   end
 
   def next_path

app/models/fasp.rb

@@ -6,4 +6,9 @@ module Fasp
   def self.table_name_prefix
     'fasp_'
   end
+
+  def self.capability_enabled?(capability_name)
+    Mastodon::Feature.fasp_enabled? &&
+      Provider.with_capability(capability_name).any?
+  end
 end

app/models/fasp/preview_card_trend.rb

@@ -16,4 +16,16 @@
 class Fasp::PreviewCardTrend < ApplicationRecord
   belongs_to :preview_card
   belongs_to :fasp_provider, class_name: 'Fasp::Provider'
+
+  scope :allowed, -> { where(allowed: true) }
+  scope :in_language, ->(language) { where(language:) }
+  scope :ranked, -> { order(rank: :desc) }
+
+  def self.preview_cards(language:)
+    scope = PreviewCard.joins(:fasp_preview_card_trends)
+                       .merge(allowed)
+                       .merge(ranked)
+    scope = scope.merge(in_language(language)) if language
+    scope
+  end
 end

app/models/fasp/status_trend.rb

@@ -16,4 +16,17 @@
 class Fasp::StatusTrend < ApplicationRecord
   belongs_to :status
   belongs_to :fasp_provider, class_name: 'Fasp::Provider'
+
+  scope :allowed, -> { where(allowed: true) }
+  scope :in_language, ->(language) { where(language:) }
+  scope :ranked, -> { order(rank: :desc) }
+
+  def self.statuses(language:, filtered_for: nil)
+    scope = Status.joins(:fasp_status_trends)
+                  .merge(allowed)
+                  .merge(ranked)
+    scope = scope.not_excluded_by_account(filtered_for).not_domain_blocked_by_account(filtered_for) if filtered_for
+    scope = scope.merge(in_language(language)) if language
+    scope
+  end
 end

app/models/fasp/tag_trend.rb

@@ -16,4 +16,16 @@
 class Fasp::TagTrend < ApplicationRecord
   belongs_to :tag
   belongs_to :fasp_provider, class_name: 'Fasp::Provider'
+
+  scope :allowed, -> { where(allowed: true) }
+  scope :in_language, ->(language) { where(language:) }
+  scope :ranked, -> { order(rank: :desc) }
+
+  def self.tags(language:)
+    scope = Tag.joins(:fasp_tag_trends)
+               .merge(allowed)
+               .merge(ranked)
+    scope = scope.merge(in_language(language)) if language
+    scope
+  end
 end

app/models/preview_card.rb

@@ -58,6 +58,7 @@ class PreviewCard < ApplicationRecord
 
   has_many :preview_cards_statuses, dependent: :delete_all, inverse_of: :preview_card
   has_many :statuses, through: :preview_cards_statuses
+  has_many :fasp_preview_card_trends, class_name: 'Fasp::PreviewCardTrend', dependent: :delete_all
 
   has_one :trend, class_name: 'PreviewCardTrend', inverse_of: :preview_card, dependent: :destroy
   belongs_to :author_account, class_name: 'Account', optional: true

app/models/status.rb

@@ -74,6 +74,7 @@ class Status < ApplicationRecord
   has_many :mentions, dependent: :destroy, inverse_of: :status
   has_many :mentioned_accounts, through: :mentions, source: :account, class_name: 'Account'
   has_many :media_attachments, dependent: :nullify
+  has_many :fasp_status_trends, class_name: 'Fasp::StatusTrend', dependent: :delete_all
 
   # The `dependent` option is enabled by the initial `mentions` association declaration
   has_many :active_mentions, -> { active }, class_name: 'Mention', inverse_of: :status # rubocop:disable Rails/HasManyOrHasOneDependent

app/models/tag.rb

@@ -31,6 +31,7 @@ class Tag < ApplicationRecord
   has_many :passive_relationships, class_name: 'TagFollow', inverse_of: :tag, dependent: :destroy
   has_many :featured_tags, dependent: :destroy, inverse_of: :tag
   has_many :followers, through: :passive_relationships, source: :account
+  has_many :fasp_tag_trends, class_name: 'Fasp::TagTrend', dependent: :delete_all
 
   has_one :trend, class_name: 'TagTrend', inverse_of: :tag, dependent: :destroy