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Filename : gradebook_grading_period_assignments.rb
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# frozen_string_literal: true

#
# Copyright (C) 2017 - present Instructure, Inc.
#
# This file is part of Canvas.
#
# Canvas is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, version 3 of the License.
#
# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.

class GradebookGradingPeriodAssignments
  def initialize(course, student: nil, course_settings: nil, includes: [])
    raise "Context must be a course" unless course.is_a?(Course)
    raise "Context must have an id" unless course.id

    @course = course
    @student = student
    @settings_for_course = course_settings || {
      "show_concluded_enrollments" => "false",
      "show_inactive_enrollments" => "false"
    }
    @includes = includes
  end

  def to_h
    return {} unless @course.grading_periods?

    the_query.each_with_object({}) do |(period_id, list), hash|
      hash[period_id || :none] = list.map(&:to_s)
    end
  end

  private

  def excluded_workflow_states
    excluded_workflow_states = ["deleted"]
    if @settings_for_course["show_concluded_enrollments"] != "true" && @includes.exclude?("completed")
      excluded_workflow_states << "completed"
    end

    if @settings_for_course["show_inactive_enrollments"] != "true" && @includes.exclude?("inactive")
      excluded_workflow_states << "inactive"
    end

    excluded_workflow_states
  end

  # One Query to rule them all, One Query to find them, One Query to bring them all, and in the darkness bind them to a hash
  def the_query
    GuardRail.activate(:secondary) do
      scope = Submission
              .active
              .joins(:assignment)
              .joins("INNER JOIN #{Enrollment.quoted_table_name} enrollments ON enrollments.user_id = submissions.user_id")
              .merge(Assignment.for_course(@course).active)
              .where(enrollments: { course_id: @course, type: ["StudentEnrollment", "StudentViewEnrollment"] })
              .where.not(enrollments: { workflow_state: excluded_workflow_states })

      scope = scope.where(user: @student) if @student
      scope
        .group(:grading_period_id)
        .pluck(:grading_period_id, Arel.sql("array_agg(DISTINCT assignment_id)"))
        .to_h
    end
  end
end