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# frozen_string_literal: true
class NoStudentsAlertManager
def initialize(courses)
@courses = courses
end
def create_alerts
@courses.each do |course|
next unless course.type == 'ClassroomProgramCourse'
next unless course.approved? # No alerts needed for unapproved courses
next unless course.students.empty?
next unless within_no_student_alert_period?(course.timeline_start)
next if Alert.exists?(course_id: course.id, type: 'NoEnrolledStudentsAlert')
alert = Alert.create(type: 'NoEnrolledStudentsAlert', course_id: course.id)
alert.send_email
end
end
private
# Only create an alert if has been at least MIN_DAYS but less than
# MAX_DAYS since the assignment start date.
NO_STUDENT_ALERT_MIN_DAYS = 15
NO_STUDENT_ALERT_MAX_DAYS = 22
def within_no_student_alert_period?(date)
return false unless date < NO_STUDENT_ALERT_MIN_DAYS.days.ago
return false unless NO_STUDENT_ALERT_MAX_DAYS.days.ago < date
true
end
end