1 files changed, 46 insertions, 0 deletions
diff --git a/app/models/trends/preview_card_filter.rb b/app/models/trends/preview_card_filter.rb
new file mode 100644
index 000000000..25add58c8
--- /dev/null
+++ b/app/models/trends/preview_card_filter.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+class Trends::PreviewCardFilter
+  KEYS = %i(
+    trending
+    locale
+  ).freeze
+
+  attr_reader :params
+
+  def initialize(params)
+    @params = params
+  end
+
+  def results
+    scope = PreviewCard.unscoped
+
+    params.each do |key, value|
+      next if %w(page locale).include?(key.to_s)
+
+      scope.merge!(scope_for(key, value.to_s.strip)) if value.present?
+    end
+
+    scope
+  end
+
+  private
+
+  def scope_for(key, value)
+    case key.to_s
+    when 'trending'
+      trending_scope(value)
+    else
+      raise "Unknown filter: #{key}"
+    end
+  end
+
+  def trending_scope(value)
+    scope = Trends.links.query
+
+    scope = scope.in_locale(@params[:locale].to_s) if @params[:locale].present?
+    scope = scope.allowed if value == 'allowed'
+
+    scope.to_arel
+  end
+end