module Billing
  class RequestBankTransfer
    class Error < StandardError; end

    PLAN_SLUGS = %w[premium_light premium_full].freeze

    def self.call(club:, user:, plan_slug:, interval:)
      new(club: club, user: user, plan_slug: plan_slug, interval: interval).call
    end

    def initialize(club:, user:, plan_slug:, interval:)
      @club = club
      @user = user
      @plan_slug = plan_slug.to_s
      @interval = interval
    end

    def call
      raise Error, "Bonifico non configurato sul server" unless MatchLiveTv.bank_transfer_configured?
      raise Error, "Piano non valido" unless @plan_slug.in?(PLAN_SLUGS)
      raise Error, "Completa i dati di fatturazione prima di richiedere il bonifico." unless @club.billing_profile_complete?
      raise Error, "Il piano è un abbonamento omaggio. Contatta il supporto per passarlo a pagamento." if @club.subscription&.admin_comped?

      @interval = Billing::Stripe::PriceCatalog.normalize_interval(@interval)
      quote = @club.active_billing_quote
      amount_cents, kind = resolve_amount(quote)

      existing = @club.billing_transfer_orders.awaiting_payment.first
      if existing
        if existing.plan_slug == @plan_slug && existing.billing_interval == @interval && existing.amount_cents == amount_cents
          return existing
        end

        existing.cancel!
      end

      order = nil
      ApplicationRecord.transaction do
        payment = @club.billing_payments.create!(
          provider: "bank_transfer",
          amount_cents: amount_cents,
          currency: "eur",
          status: "pending",
          plan_slug: @plan_slug,
          description: payment_description(kind, amount_cents)
        )
        order = @club.billing_transfer_orders.create!(
          billing_club_quote: kind == "commercial_quote" ? quote : nil,
          billing_payment: payment,
          plan_slug: @plan_slug,
          billing_interval: @interval,
          amount_cents: amount_cents,
          currency: "eur",
          kind: kind,
          status: "awaiting_payment",
          reference_code: generate_reference_code,
          requested_by_user: @user
        )
      end

      # Le istruzioni (IBAN/causale) le manda a mano l'admin da /admin/billing.
      Rails.logger.info("[BankTransfer] ordine #{order.reference_code} in attesa, nessuna mail istruzioni")
      order
    end

    private

    def resolve_amount(quote)
      if quote
        unless quote.matches?(@plan_slug, @interval)
          raise Error, "Per questa società è attivo un prezzo concordato su #{quote.plan.name} (#{quote.price_label})."
        end

        return [quote.amount_cents, "commercial_quote"]
      end

      [Billing::Stripe::PriceCatalog.amount_cents(plan_slug: @plan_slug, interval: @interval), "list_price"]
    end

    def payment_description(kind, amount_cents)
      label = Billing::Stripe::PriceCatalog.format_interval_price(amount_cents, @interval)
      suffix = kind == "commercial_quote" ? "prezzo concordato, bonifico" : "bonifico"
      "#{Plan[@plan_slug].name} — #{label} (#{suffix})"
    end

    def generate_reference_code
      8.times do
        code = "MLTV-#{SecureRandom.alphanumeric(6).upcase}"
        return code unless TransferOrder.exists?(reference_code: code)
      end

      raise Error, "Impossibile generare il riferimento del bonifico"
    end
  end
end