module Mailing
  class OnboardingTeacherService
    include Service

    def initialize(operation, teacher)
      @operation = operation
      @teacher = teacher
    end

    def call
      send(@operation, @teacher) if respond_to?(@operation)
    end

    private

    def send_teacher_how_to_add_students(teacher)
      return unless Feature.teacher_how_to_add_students?

      return if teacher.email.blank?
      return unless teacher.label_for(:email_teacher_onboarding_triggers).in?(%w[b c])
      return unless teacher.groups.any? && teacher.students.uniq.count < 2

      AzbookaMailer.send_mail(:teacher_how_to_add_students, email_teacher_how_to_add_students(teacher))
    end

    def email_teacher_how_to_add_students(teacher)
      class_book = teacher.class_book.first
      {
        email: teacher.email,
        tname: teacher.io,
        addedclass: class_book.name
      }
    end

    def send_help_for_teacher_with_add_students(teacher)
      return unless Feature.help_for_teacher_with_add_students?

      return if teacher.email.blank?
      return unless teacher.label_for(:email_teacher_onboarding_triggers) == 'c'
      return unless teacher.groups.any? && teacher.students.uniq.count < 3

      AzbookaMailer.send_mail(:help_for_teacher_with_add_students, email_help_for_teacher_with_add_students(teacher))
    end

    def email_help_for_teacher_with_add_students(teacher)
      class_book = teacher.class_books.order(created_at: :desc).first
      {
        email: teacher.email,
        tname: teacher.io,
        addedclass: class_book.name,
        classid: class_book.id
      }
    end

    def send_teacher_how_to_add_parents(teacher)
      return unless Feature.teacher_how_to_add_parents?

      return if teacher.email.blank?
      return unless teacher.label_for(:email_teacher_onboarding_triggers).in?(%w[b c])
      return unless teacher.groups.present? && teacher.students.present? &&
                    teacher.students.all? { |s| s.parent2_id.nil? }

      AzbookaMailer.send_mail(:teacher_how_to_add_parents, email_teacher_how_to_add_parent(teacher))
    end

    def email_teacher_how_to_add_parent(teacher)
      {
        email: teacher.email,
        tname: teacher.io,
        classid: teacher.group_with_most_students_without_parents.id
      }
    end

    def send_help_for_teacher_to_add_parents(teacher)
      return unless Feature.help_for_teacher_to_add_parents?

      return if teacher.email.blank?
      return unless teacher.label_for(:email_teacher_onboarding_triggers) == 'c'
      return unless teacher.groups.any? && teacher.students.uniq.count >= 3 && teacher.students.none?(&:parent2_id)

      AzbookaMailer.send_mail(:help_for_teacher_to_add_parents, email_help_for_teacher_to_add_parents(teacher))
    end

    def email_help_for_teacher_to_add_parents(teacher)
      class_book = teacher.group_with_most_students_without_parents.class_book
      {
        email: teacher.email,
        tname: teacher.io,
        addedclass: class_book.name,
        students: class_book.students.map(&:name_with_short_surname).join(', '),
        classid: class_book
      }
    end

    def send_activation_certificate_for_teacher_activity(teacher)
      return unless Feature.activation_certificate_for_teacher_activity?

      return if teacher.email.blank?
      return unless teacher.label_for(:email_teacher_onboarding_triggers).in?(%w[b c])
      return unless teacher&.class_books&.any? && (teacher.students.count == 5) &&
                    teacher.students.all? { |s| s.parent2.present? }

      AzbookaMailer.send_mail(:activation_certificate_for_teacher_activity,
                              email_activation_certificate_for_teacher_activity(teacher))
    end

    def email_activation_certificate_for_teacher_activity(teacher)
      {
        email: teacher.email,
        tname: teacher.io
      }
    end
  end
end