class GovukNotifyPersonalisation::VaccinationDetailsPresenter

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 5
def initialize(personalisation)
  @personalisation = personalisation
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 20
def is_catch_up?
  return false if patient.nil? || programmes.empty?

  @is_catch_up ||=
    programmes.any? { it.is_catch_up?(year_group: patient_year_group) }
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 31
def outcome_administered?
  vaccination_record.nil? || vaccination_record.administered?
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 27
def outcome_not_administered?
  vaccination_record.nil? || !outcome_administered?
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 152
def patient_year_group
  @patient_year_group ||= patient.year_group(academic_year:)
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 156
def programme_names
  @programme_names ||= programmes.map { programme_name_for_parents(it) }
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 160
def programme_names_and_methods
  @programme_names_and_methods ||=
    programmes.map do |programme|
      if programme.has_multiple_vaccine_methods?
        vaccine_method =
          if vaccination_record
            Vaccine.delivery_method_to_vaccine_method(
              vaccination_record.delivery_method
            )
          elsif patient
            patient.vaccine_criteria(
              programme:,
              academic_year:
            ).primary_method
          end

        method_prefix =
          Vaccine.human_enum_name(:method_prefix, vaccine_method)
        "#{method_prefix} #{programme.name_in_sentence}".lstrip
      else
        programme.name_in_sentence
      end
    end
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 35
def reason_did_not_vaccinate
  return if vaccination_record.nil? || vaccination_record.administered?

  I18n.t(
    vaccination_record.outcome,
    scope: "mailers.vaccination_mailer.reasons_did_not_vaccinate",
    short_patient_name:
  )
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 148
def short_patient_name
  personalisation.short_patient_name
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 45
  def show_additional_instructions? =
    vaccination_record.present? && !vaccination_record.already_had?

  def vaccination
    if vaccination_record.present?
      # We're sending communication about a specific vaccination that took place.
      "#{programme_names.to_sentence} vaccination".pluralize(
        programme_names.length
      )
    else
      # We're sending about a vaccination that will take place.
      names = programme_names

      if mmr_second_dose_required?
        names = names.map { it == "MMR" ? "2nd dose of the MMR" : it }
      end

      "#{names.to_sentence} vaccination".pluralize(names.length)
    end
  end

  def vaccination_and_dates
    if next_or_today_session_dates_or.present?
      "#{vaccination} on #{next_or_today_session_dates_or}"
    else
      vaccination
    end
  end

  # TODO: Remove this method when schools start offering MMRV.
  def vaccination_and_dates_sms
    if next_or_today_session_dates_or.present?
      "#{vaccination} on #{next_or_today_session_dates_or}"
    else
      vaccination
    end
  end

  def vaccination_and_method
    "#{programme_names_and_methods.to_sentence} vaccination".pluralize(
      programme_names_and_methods.length
    )
  end

  def vaccine
    "#{programme_names.to_sentence} vaccine".pluralize(programme_names.length)
  end

  def vaccine_and_dose
    if (dose_sequence = vaccination_record&.dose_sequence)
      "#{programme_names.to_sentence} #{dose_sequence.ordinalize} dose"
    else
      programme_names.to_sentence
    end
  end

  def vaccine_and_method
    "#{programme_names_and_methods.to_sentence} vaccine".pluralize(
      programme_names_and_methods.length
    )
  end

  def vaccine_is?(method)
    if vaccination_record
      vaccination_record.vaccine&.method == method
    elsif programmes.present?
      if patient
        programmes.any? do |programme|
          patient.vaccine_criteria(
            programme:,
            academic_year:
          ).primary_method == method
        end
      else
        Vaccine.for_programmes(programmes).exists?(method:)
      end
    end
  end

  def vaccine_side_effects
    side_effects =
      if vaccination_record
        vaccination_record.vaccine&.side_effects
      elsif programmes.present?
        if patient
          programmes.flat_map do |programme|
            patient.vaccine_criteria(programme:, academic_year:).side_effects
          end
        else
          Vaccine.for_programmes(programmes).active.flat_map(&:side_effects)
        end
      end

    return if side_effects.nil?

    descriptions =
      side_effects.map { Vaccine.human_enum_name(:side_effect, it) }.sort.uniq

    descriptions.map { "- #{it}" }.join("\n")
  end

  private

  def short_patient_name
    personalisation.short_patient_name
  end

  def patient_year_group
    @patient_year_group ||= patient.year_group(academic_year:)
  end

  def programme_names
    @programme_names ||= programmes.map { programme_name_for_parents(it) }
  end

  def programme_names_and_methods
    @programme_names_and_methods ||=
      programmes.map do |programme|
        if programme.has_multiple_vaccine_methods?
          vaccine_method =
            if vaccination_record
              Vaccine.delivery_method_to_vaccine_method(
                vaccination_record.delivery_method
              )
            elsif patient
              patient.vaccine_criteria(
                programme:,
                academic_year:
              ).primary_method
            end

          method_prefix =
            Vaccine.human_enum_name(:method_prefix, vaccine_method)
          "#{method_prefix} #{programme.name_in_sentence}".lstrip
        else
          programme.name_in_sentence
        end
      end
  end
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 48
def vaccination
  if vaccination_record.present?
    # We're sending communication about a specific vaccination that took place.
    "#{programme_names.to_sentence} vaccination".pluralize(
      programme_names.length
    )
  else
    # We're sending about a vaccination that will take place.
    names = programme_names

    if mmr_second_dose_required?
      names = names.map { it == "MMR" ? "2nd dose of the MMR" : it }
    end

    "#{names.to_sentence} vaccination".pluralize(names.length)
  end
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 66
def vaccination_and_dates
  if next_or_today_session_dates_or.present?
    "#{vaccination} on #{next_or_today_session_dates_or}"
  else
    vaccination
  end
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 75
def vaccination_and_dates_sms
  if next_or_today_session_dates_or.present?
    "#{vaccination} on #{next_or_today_session_dates_or}"
  else
    vaccination
  end
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 83
def vaccination_and_method
  "#{programme_names_and_methods.to_sentence} vaccination".pluralize(
    programme_names_and_methods.length
  )
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 89
def vaccine
  "#{programme_names.to_sentence} vaccine".pluralize(programme_names.length)
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 93
def vaccine_and_dose
  if (dose_sequence = vaccination_record&.dose_sequence)
    "#{programme_names.to_sentence} #{dose_sequence.ordinalize} dose"
  else
    programme_names.to_sentence
  end
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 101
def vaccine_and_method
  "#{programme_names_and_methods.to_sentence} vaccine".pluralize(
    programme_names_and_methods.length
  )
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 107
def vaccine_is?(method)
  if vaccination_record
    vaccination_record.vaccine&.method == method
  elsif programmes.present?
    if patient
      programmes.any? do |programme|
        patient.vaccine_criteria(
          programme:,
          academic_year:
        ).primary_method == method
      end
    else
      Vaccine.for_programmes(programmes).exists?(method:)
    end
  end
end

# File app/lib/govuk_notify_personalisation/vaccination_details_presenter.rb, line 124
def vaccine_side_effects
  side_effects =
    if vaccination_record
      vaccination_record.vaccine&.side_effects
    elsif programmes.present?
      if patient
        programmes.flat_map do |programme|
          patient.vaccine_criteria(programme:, academic_year:).side_effects
        end
      else
        Vaccine.for_programmes(programmes).active.flat_map(&:side_effects)
      end
    end

  return if side_effects.nil?

  descriptions =
    side_effects.map { Vaccine.human_enum_name(:side_effect, it) }.sort.uniq

  descriptions.map { "- #{it}" }.join("\n")
end