module PatientMergeFormConcern

# File app/forms/concerns/patient_merge_form_concern.rb, line 17
def existing_patient
  return if nhs_number.blank?

  @existing_patient ||=
    find_existing(patient_policy_scope) ||
      find_existing(Patient.where.missing(:patient_locations))
end

# File app/forms/concerns/patient_merge_form_concern.rb, line 25
def find_existing(scope)
  scope
    .where.not(id: patient.id)
    .includes(:vaccination_records)
    .find_by(nhs_number: nhs_number)
end

# File app/forms/concerns/patient_merge_form_concern.rb, line 12
def nhs_number=(value)
  super(value.presence&.gsub(/\s/, ""))
end

# File app/forms/concerns/patient_merge_form_concern.rb, line 32
def save
  return false if invalid?

  if existing_patient
    PatientMerger.call(
      to_keep: existing_patient,
      to_destroy: patient,
      user: current_user
    )
  end

  true
end