module Billing
  class Invoice < ApplicationRecord
    self.table_name = "billing_invoices"

    STATUSES = %w[draft issued sent cancelled].freeze
    SOURCES = %w[aruba manual].freeze

    belongs_to :club
    belongs_to :billing_payment, class_name: "Billing::Payment", optional: true
    has_one_attached :pdf

    validates :number, presence: true, uniqueness: { scope: :club_id }
    validates :issued_on, presence: true
    validates :amount_cents, numericality: { greater_than: 0 }
    validates :currency, presence: true
    validates :status, inclusion: { in: STATUSES }
    validates :source, inclusion: { in: SOURCES }
    validate :pdf_present_when_issued

    scope :recent, -> { order(issued_on: :desc, created_at: :desc) }

    def amount_euros
      amount_cents / 100.0
    end

    def formatted_amount
      format("%.2f €", amount_euros)
    end

    def downloadable?
      pdf.attached?
    end

    private

    def pdf_present_when_issued
      return unless status.in?(%w[issued sent])
      return if pdf.attached?

      errors.add(:pdf, "è obbligatorio per le fatture emesse")
    end
  end
end