graphql: student-in-course analytics summary types

refs CNVS-37582, refs CNVS-37583

Test plan:
  querying for a users summaryAnalytics should return null (the real
  implementation is provided by the analytics plugin)

Change-Id: I6fb746ac0ed5b1ca6192e6b814eab0bf112bef9b
Reviewed-on: https://gerrit.instructure.com/123216
Reviewed-by: Jonathan Featherstone <jfeatherstone@instructure.com>
Tested-by: Jenkins
QA-Review: Collin Parrish <cparrish@instructure.com>
Product-Review: Cameron Matheson <cameron@instructure.com>

app/graphql/loaders/course_student_analytics_loader.rb

@@ -0,0 +1,14 @@
+# This is a dummy implementation. The real implementation is provided by the
+# Canvas analytics plugin
+class Loaders::CourseStudentAnalyticsLoader < GraphQL::Batch::Loader
+  def initialize(course_id, current_user:, session:)
+    @course_id = course_id
+    @current_user = current_user
+    @session = session
+  end
+
+  def perform(users)
+    users.each { |u| fulfill(u, nil) }
+  end
+end
+

app/graphql/types/student_summary_analytics_type.rb

@@ -0,0 +1,39 @@
+module Types
+  StudentSummaryAnalyticsType = GraphQL::ObjectType.define do
+    name "StudentSummaryAnalytics"
+    description "basic information about a students activity in a course"
+
+    field :pageViews, PageViewAnalysisType, property: :page_views
+    field :participations, PageViewAnalysisType, property: :participations
+    field :tardinessBreakdown, TardinessBreakdownType, property: :tardiness_breakdown
+  end
+
+  PageViewAnalysisType = GraphQL::ObjectType.define do
+    name "PageViewAnalysis"
+
+    field :total, types.Int do
+      description "The number of views/participations this student has"
+      hash_key :total
+    end
+
+    field :max, types.Int do
+      description "The maximum number of views/participations in this course"
+      hash_key :max
+    end
+
+    field :level, types.Int do
+      description "This number (0-3) is intended to give an idea of how the student is doing relative to others in the course"
+      hash_key :level
+    end
+  end
+
+  TardinessBreakdownType = GraphQL::ObjectType.define do
+    name "TardinessBreakdown"
+    description "statistics based on timeliness of student submissions"
+
+    field :total, types.Int, hash_key: :total
+    field :late, types.Float, hash_key: :late
+    field :missing, types.Float, hash_key: :missing
+    field :onTime, types.Float, hash_key: :on_time
+  end
+end

app/graphql/types/user_type.rb

@@ -44,7 +44,21 @@ module Types
         end
       end
     end
+
+    field :summaryAnalytics, StudentSummaryAnalyticsType do
+      argument :courseId, !types.ID,
+        "returns summary analytics for this course",
+        prepare: GraphQLHelpers.relay_or_legacy_id_prepare_func("Course")
+
+      resolve ->(user, args, ctx) do
+        Loaders::CourseStudentAnalyticsLoader.for(
+          args[:courseId],
+          current_user: ctx[:current_user], session: ctx[:session]
+        ).load(user)
+      end
+    end
   end
+
 end
 
 class UserCourseEnrollmentLoader < Loaders::ForeignKeyLoader