class ImportDuplicateForm

# File app/forms/import_duplicate_form.rb, line 37
def apply_changes_options
  if can_apply?
    can_keep_both? ? %w[apply discard keep_both] : %w[apply discard]
  else
    %w[discard]
  end
end

# File app/forms/import_duplicate_form.rb, line 52
def apply_pending_changes!
  return unless can_apply?

  object.patient.apply_pending_changes! if object.respond_to?(:patient)

  object.apply_pending_changes!
end

# File app/forms/import_duplicate_form.rb, line 45
def can_apply?
  !(
    object.is_a?(VaccinationRecord) &&
      object.sourced_from_nhs_immunisations_api?
  )
end

# File app/forms/import_duplicate_form.rb, line 32
def can_keep_both?
  # Vaccination records have lots of relationships that make it difficult to handle
  object.is_a?(Patient) && object.changesets.none?(&:matched_on_nhs_number)
end

# File app/forms/import_duplicate_form.rb, line 75
def changeset_for_keep_both
  scope = object.changesets.includes(:import).order(:created_at)

  completed_import_statuses = %w[
    processed
    partially_processed
    removing_parent_relationships
  ]

  scope
    .processed
    .select { completed_import_statuses.include?(it.import&.status) }
    .last
end

# File app/forms/import_duplicate_form.rb, line 60
def discard_pending_changes!
  object.patient.discard_pending_changes! if object.respond_to?(:patient)

  object.discard_pending_changes!
end

# File app/forms/import_duplicate_form.rb, line 66
def keep_both_changes!
  return unless can_keep_both?
  return unless can_apply?

  object.apply_pending_changes_to_new_record!(
    changeset: changeset_for_keep_both
  )
end

# File app/forms/import_duplicate_form.rb, line 90
def reset_count!
  TeamCachedCounts.new(current_team).reset_import_issues!
end

# File app/forms/import_duplicate_form.rb, line 10
def save
  return false unless valid?

  ActiveRecord::Base.transaction do
    case apply_changes
    when "apply"
      apply_pending_changes!
    when "discard"
      discard_pending_changes!
    when "keep_both"
      keep_both_changes!
    end
  end

  reset_count!

  true
rescue ActiveRecord::RecordInvalid
  errors.add(:base, "Failed to save changes")
  false
end