#434

backend/app/services/counts_resource_definition.rb

@@ -31,7 +31,35 @@ class CountsResourceDefinition
   OPERATORS = {
       string: ['eq', 'ne', 'like'], enum: ['eq', 'ne'], boolean: ['eq', 'ne'],
       integer: ['eq', 'ne', 'gt', 'lt', 'ge', 'le', 'range'],
-      datetime: ['eq', 'ne', 'gt', 'lt', 'ge', 'le', 'range'] }.freeze
+      datetime: ['eq', 'ne', 'gt', 'lt', 'ge', 'le', 'range'],
+      interval: ['range'] }.freeze
+  LABELS = {
+      'resource_id' => 'counts:columns.resourceId', 'version_no' => 'counts:columns.version',
+      'is_latest' => 'counts:columns.latest', 'event_type' => 'counts:eventType',
+      'user' => 'history:actor', 'created_at' => 'counts:columns.changedAt',
+      'thumbnail' => 'counts:columns.thumbnailDisplay',
+      'thumbnail_base' => 'counts:columns.thumbnailURL',
+      'title' => 'counts:columns.postTitle', 'url' => 'counts:columns.postURL',
+      'tags' => 'counts:columns.tags', 'tags_json' => 'counts:columns.tags',
+      'video_ms' => 'shared:labels.duration', 'name' => 'counts:columns.name',
+      'names' => 'counts:columns.names', 'category' => 'common:categoryLabel',
+      'aliases' => 'tags:aliases', 'deprecated' => 'counts:columns.deprecated',
+      'original_created_from' => 'counts:columns.originalFrom',
+      'original_created_before' => 'counts:columns.originalBefore',
+      'language_code' => 'counts:columns.language' }.freeze
+  CHILD_LABELS = {
+      'id' => 'counts:columns.resourceId', 'versionNo' => 'history:version',
+      'kind' => 'counts:columns.kind', 'name' => 'history:name',
+      'category' => 'common:categoryLabel', 'sections' => 'counts:columns.sections',
+      'names' => 'counts:columns.names', 'aliases' => 'tags:aliases',
+      'languageCode' => 'counts:columns.language',
+      'scriptCode' => 'history:nameChanges.script',
+      'autoGenerated' => 'history:nameChanges.automatic',
+      'tagId' => 'counts:attributes.tag_id', 'tagGroupId' => 'counts:resources.tag_groups',
+      'sectionName' => 'counts:attributes.section_name',
+      'description' => 'counts:attributes.description',
+      'children' => 'counts:attributes.children', 'profile' => 'counts:attributes.profile',
+      'path' => 'counts:attributes.path' }.freeze
 
   attr_reader :model, :keys, :fields, :resource
 
@@ -62,4 +90,57 @@ class CountsResourceDefinition
         operators: OPERATORS.fetch(type, []) }
     end
   end
+
+  def field_label(key) = LABELS.fetch(key, "counts:attributes.#{ key }")
+
+  def output_fields
+    content = case resource
+              when 'posts'
+                ['thumbnail', 'title', 'url', 'thumbnail_base', 'tags', 'parents', 'video_ms',
+                 'original_created_from', 'original_created_before']
+              when 'tags' then ['name', 'names', 'category', 'aliases', 'parents', 'deprecated']
+              else fields.keys - COMMON.keys
+              end
+    keys = ['resource_id', 'version_no', 'is_latest'] + (content - ['thumbnail']) +
+        ['event_type', 'user', 'created_at']
+    keys.unshift('thumbnail') if content.include?('thumbnail')
+    keys.map do |key|
+      label = if key == 'parents'
+                resource == 'tags' ? 'tags:parents' : 'shared:labels.parentPosts'
+              else field_label(key)
+              end
+      field = { key:, label: }
+      children = child_fields(key)
+      field[:children] = children if children.any?
+      field
+    end
+  end
+
+  def child_fields(key, depth = 4)
+    keys = case key
+           when 'tags' then ['id', 'versionNo', 'kind', 'name', 'category', 'sections', 'names']
+           when 'names' then ['languageCode', 'scriptCode', 'name', 'aliases', 'autoGenerated']
+           when 'aliases'
+             resource == 'tags' ? ['languageCode', 'name', 'scriptCode'] : ['name', 'scriptCode']
+           when 'parents' then resource == 'tags' ? ['id', 'name'] : ['id']
+           when 'members' then ['tagId', 'tagGroupId', 'versionNo']
+           when 'export_paths_json' then ['profile', 'path']
+           when 'placements', 'children'
+             scalar = ['sectionName', 'description', 'tagId', 'tagGroupId']
+             scalar + (depth > 0 ? ['children'] : [])
+           else []
+           end
+    keys.map do |child|
+      label = key == 'members' && child == 'tagId' ?
+          'counts:columns.resourceId' : CHILD_LABELS.fetch(child)
+      field = { key: child, label: }
+      children = child_fields(child, child == 'children' ? depth - 1 : depth)
+      # Language is attached to top-level aliases, not to aliases inside a language entry.
+      children = children.reject { _1[:key] == 'languageCode' } if child == 'aliases'
+      field[:children] = children if children.any?
+      field
+    end
+  end
+
+  def filter_metadata = @filter_metadata ||= CountsCondition.fields(self)
 end