module Validations::PropertyValidations
  # Validations methods need to be called 'validate_<page_name>' to run on model save
  # or 'validate_' to run on submit as well
  POSTCODE_REGEXP = /^(([A-Z]{1,2}[0-9][A-Z0-9]?|ASCN|STHL|TDCU|BBND|[BFS]IQQ|PCRN|TKCA) ?[0-9][A-Z]{2}|BFPO ?[0-9]{1,4}|(KY[0-9]|MSR|VG|AI)[ -]?[0-9]{4}|[A-Z]{2} ?[0-9]{2}|GE ?CX|GIR ?0A{2}|SAN ?TA1)$/i

  def validate_property_number_of_times_relet(record)
    return unless record.offered

    # Since offered is an integer type ActiveRecord will automatically cast that for us
    # but it's type casting is a little lax so "random" becomes 0. To make sure that doesn't pass
    # validation and then get silently dropped we attempt strict type casting on the original value
    # as part of our validation.
    begin
      Integer(record.offered_before_type_cast)
    rescue ArgumentError
      record.errors.add :offered, I18n.t("validations.property.offered.relet_number")
    end

    if record.offered.negative? || record.offered > 20
      record.errors.add :offered, I18n.t("validations.property.offered.relet_number")
    end
  end

  REFERRAL_INVALID_TMP = [8, 10, 12, 13, 14, 15].freeze
  def validate_rsnvac(record)
    if !record.first_time_property_let_as_social_housing? && record.has_first_let_vacancy_reason?
      record.errors.add :rsnvac, I18n.t("validations.property.rsnvac.first_let_not_social")
    end

    if record.first_time_property_let_as_social_housing? && record.rsnvac.present? && !record.has_first_let_vacancy_reason?
      record.errors.add :rsnvac, I18n.t("validations.property.rsnvac.first_let_social")
    end

    if record.is_relet_to_temp_tenant? && !record.previous_tenancy_was_temporary?
      record.errors.add :rsnvac, I18n.t("validations.property.rsnvac.non_temp_accommodation")
    end

    if record.is_relet_to_temp_tenant? && REFERRAL_INVALID_TMP.include?(record.referral)
      record.errors.add :rsnvac, I18n.t("validations.property.rsnvac.referral_invalid")
      record.errors.add :referral, I18n.t("validations.household.referral.rsnvac_non_temp")
    end
  end

  def validate_unitletas(record)
    if record.first_time_property_let_as_social_housing? && record.unitletas.present?
      record.errors.add :unitletas, I18n.t("validations.property.rsnvac.previous_let_social")
    end
  end

  def validate_property_postcode(record)
    postcode = record.postcode_full
    if record.postcode_known? && (postcode.blank? || !postcode.match(POSTCODE_REGEXP))
      error_message = I18n.t("validations.postcode")
      record.errors.add :postcode_full, error_message
    end
  end

  def validate_shared_housing_rooms(record)
    if record.beds.present? && record.beds.negative?
      record.errors.add :beds, I18n.t("validations.property.beds.negative")
    end

    unless record.unittype_gn.nil?
      if record.is_bedsit? && record.beds != 1 && record.beds.present?
        record.errors.add :unittype_gn, I18n.t("validations.property.unittype_gn.one_bedroom_bedsit")
        record.errors.add :beds, I18n.t("validations.property.unittype_gn.one_bedroom_bedsit")
      end

      if record.hhmemb == 1 && record.is_shared_housing? &&
          !record.beds.to_i.between?(1, 3) && record.beds.present?
        record.errors.add :unittype_gn, I18n.t("validations.property.unittype_gn.one_three_bedroom_single_tenant_shared")
        record.errors.add :beds, I18n.t("validations.property.unittype_gn.one_three_bedroom_single_tenant_shared")
      elsif record.is_shared_housing? && record.beds.present? && !record.beds.to_i.between?(1, 7)
        record.errors.add :unittype_gn, I18n.t("validations.property.unittype_gn.one_seven_bedroom_shared")
        record.errors.add :beds, I18n.t("validations.property.unittype_gn.one_seven_bedroom_shared")
      end
    end

    if record.beds.present? && record.beds > 12
      record.errors.add :beds, I18n.t("validations.property.beds.over_max")
    end
  end
end