# Price 是价格。
# pricing: 基价(Base)、折扣成分、额外收费成分、厂商建议价。
# charging: 一次性收费、重复性收费、使用率收费。

module Unidom
  module Price

    class Price < ApplicationRecord

      self.table_name = 'unidom_prices'

      include Unidom::Common::Concerns::ModelExtension
      include ProgneTapera::EnumCode

      validates :amount, presence: true, numericality: { greater_than_or_equal_to: 0, less_than_or_equal_to: 1_000_000_000 }

      belongs_to :priced, polymorphic: true
      belongs_to :pricer, polymorphic: true

      scope :priced_by, ->(pricer) { where pricer: pricer }
      scope :priced_is, ->(priced) { where priced: priced }

      code :calculation, Unidom::Price::Calculation
      code :charging,    Unidom::Price::Charging
      code :pricing,     Unidom::Price::Pricing

      ##
      # 将物品 priced 定价为 amount ， 定价者是 pricer。
      def self.price!(priced, amount: 0, pricer: nil, calculation_code: 'AMNT', pricing_code: 'BASE', charging_code: 'ONCE', opened_at: Time.now)

        assert_present! :priced,           priced
        assert_present! :amount,           amount
        assert_present! :calculation_code, calculation_code
        assert_present! :pricing_code,     pricing_code
        assert_present! :charging_code,    charging_code
        assert_present! :opened_at,        opened_at

        price = priced_is(priced).calculation_coded_as(calculation_code).pricing_coded_as(pricing_code).charging_coded_as(charging_code).valid_at.alive.first
        if price.present?
          price.amount = amount
          if pricer.present?
            price.pricer = pricer
          else
            price.pricer_id   = Unidom::Common::NULL_UUID
            price.pricer_type = ''
          end
        else
          attributes = { priced: priced, amount: amount, calculation_code: calculation_code, pricing_code: pricing_code, charging_code: charging_code, opened_at: opened_at }
          if pricer.present?
            attributes[:pricer] = pricer
          else
            attributes[:pricer_id]   = Unidom::Common::NULL_UUID
            attributes[:pricer_type] = ''
          end
          create! attributes
        end
      end

    end unless Unidom::Common::Neglection.namespace_neglected? 'Unidom::Price::Price'

  end
end