class RubyNative::IAP::CompletionsController

def create
  intent = PurchaseIntent.find_by!(uuid: params[:uuid])
  return head :ok if intent.completed?
  transaction = verify_transaction!(intent)
  intent.update!(status: :completed, environment: transaction["environment"]&.downcase)
  event = Event.new(
    type: "subscription.created",
    status: "active",
    owner_token: intent.customer_id,
    product_id: transaction["productId"],
    original_transaction_id: transaction["originalTransactionId"],
    transaction_id: transaction["transactionId"],
    purchase_date: parse_timestamp(transaction["purchaseDate"]),
    expires_date: parse_timestamp(transaction["expiresDate"]),
    environment: transaction["environment"]&.downcase,
    notification_uuid: SecureRandom.uuid,
    success_path: intent.success_path
  )
  RubyNative.fire_subscription_callbacks(event)
  head :ok
rescue ActiveRecord::RecordNotFound
  head :not_found
rescue VerificationError, JWT::DecodeError => e
  Rails.logger.warn "[RubyNative] Completion verification failed: #{e.message}"
  head :unprocessable_entity
end

def verify_transaction!(intent)
  signed_transaction = params[:signed_transaction]
  if signed_transaction.present?
    transaction = decode_and_verify_jws(signed_transaction)
    if transaction["appAccountToken"] != intent.uuid
      raise VerificationError, "appAccountToken does not match intent UUID"
    end
    transaction
  elsif Rails.env.local?
    # Allow unsigned completions for Xcode StoreKit testing in development.
    {
      "productId" => intent.product_id,
      "originalTransactionId" => "xcode_#{intent.uuid}",
      "transactionId" => "xcode_#{intent.uuid}",
      "purchaseDate" => (Time.current.to_f * 1000).to_i,
      "expiresDate" => (1.year.from_now.to_f * 1000).to_i,
      "environment" => "Xcode"
    }
  else
    raise VerificationError, "Missing signed_transaction"
  end
end