module ClubBillingProfile
  extend ActiveSupport::Concern

  BILLING_ENTITY_TYPE_KEYS = %w[company individual nonprofit].freeze

  class_methods do
    def billing_entity_types
      ClubBillingProfile::BILLING_ENTITY_TYPE_KEYS.index_with { |key| I18n.t("billing.entity_types.#{key}") }
    end
  end

  included do
    validates :billing_entity_type, inclusion: { in: BILLING_ENTITY_TYPE_KEYS }, allow_nil: true
    validates :billing_email, format: { with: URI::MailTo::EMAIL_REGEXP }, allow_blank: true
    validates :billing_recipient_code, length: { is: 7 }, allow_blank: true
    validates :billing_province, length: { is: 2 }, allow_blank: true
    validates :billing_country, length: { is: 2 }, allow_blank: true
    validate :billing_profile_for_invoicing, on: :billing_profile
  end

  def billing_profile_complete?
    billing_profile_errors.empty?
  end

  # Campi minimi per intestazione fattura e invio (email PDF + SDI/PEC).
  def billing_profile_errors
    errors = []
    errors << I18n.t("billing.profile_errors.entity_type") if billing_entity_type.blank?
    errors << I18n.t("billing.profile_errors.legal_name") if billing_legal_name.blank?
    errors << I18n.t("billing.profile_errors.email") if billing_email.blank?
    errors << I18n.t("billing.profile_errors.address") if billing_address_line.blank?
    errors << I18n.t("billing.profile_errors.city") if billing_city.blank?
    errors << I18n.t("billing.profile_errors.province") if billing_province.blank? || billing_province.to_s.length != 2
    errors << I18n.t("billing.profile_errors.postal_code") if billing_postal_code.blank?
    errors << I18n.t("billing.profile_errors.country") if billing_country.blank? || billing_country.to_s.length != 2
    errors.concat(billing_tax_id_errors)
    errors << I18n.t("billing.profile_errors.sdi_or_pec") if billing_recipient_code.blank? && billing_pec.blank?
    errors << I18n.t("billing.profile_errors.sdi_invalid") if billing_recipient_code.present? && billing_recipient_code.length != 7
    errors
  end

  def billing_tax_id_errors
    case billing_entity_type
    when "company"
      billing_vat_number.blank? ? [I18n.t("billing.profile_errors.vat_number")] : []
    when "individual"
      billing_fiscal_code.blank? ? [I18n.t("billing.profile_errors.fiscal_code")] : []
    else
      billing_vat_number.blank? && billing_fiscal_code.blank? ? [I18n.t("billing.profile_errors.vat_or_fiscal")] : []
    end
  end

  def billing_profile_summary
    parts = [billing_legal_name.presence, billing_vat_number.presence && "P.IVA #{billing_vat_number}"]
    parts.compact.join(" · ")
  end

  # Righe per intestazione fattura in admin (etichetta, valore).
  def billing_profile_invoice_lines
    lines = []
    lines << ["Tipo", self.class.billing_entity_types[billing_entity_type]] if billing_entity_type.present?
    lines << ["Intestatario", billing_legal_name] if billing_legal_name.present?
    lines << ["P.IVA", billing_vat_number] if billing_vat_number.present?
    lines << ["Codice fiscale", billing_fiscal_code] if billing_fiscal_code.present?
    lines << ["Email fatturazione", billing_email] if billing_email.present?
    lines << ["Telefono", billing_phone] if billing_phone.present?
    core_address = [billing_address_line, billing_postal_code, billing_city, billing_province].compact_blank
    if core_address.any?
      core_address << billing_country if billing_country.present?
      lines << ["Indirizzo", core_address.join(", ")]
    end
    lines << ["SDI", billing_recipient_code] if billing_recipient_code.present?
    lines << ["PEC", billing_pec] if billing_pec.present?
    lines
  end

  # Stato profilo fiscale per badge admin: :complete | :incomplete | :absent
  def billing_profile_admin_status
    return :complete if billing_profile_complete?
    return :absent unless billing_profile_started?

    :incomplete
  end

  def billing_profile_started?
    billing_legal_name.present? ||
      billing_vat_number.present? ||
      billing_fiscal_code.present? ||
      billing_email.present? ||
      billing_phone.present? ||
      billing_address_line.present? ||
      billing_city.present? ||
      billing_postal_code.present? ||
      billing_province.present? ||
      billing_recipient_code.present? ||
      billing_pec.present?
  end

  private

  def billing_profile_for_invoicing
    billing_profile_errors.each do |message|
      errors.add(:base, message)
    end
  end
end