Class: Istox::OrderBookProrate

Inherits:
Object
  • Object
show all
Defined in:
lib/istox/helpers/order_book_prorate.rb

Class Method Summary collapse

Class Method Details

.allocation(token_price:, min_investment:, bid_block:, invest_step:, hard_cap:, investments:, whitelists: [], include_refund_amount: false, rollover_investments: []) ⇒ Object

rubocop:disable Metrics/AbcSize,Metrics/PerceivedComplexity



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# File 'lib/istox/helpers/order_book_prorate.rb', line 4

def allocation(token_price:, min_investment:, bid_block:, # rubocop:disable Metrics/AbcSize,Metrics/PerceivedComplexity
               invest_step:, hard_cap:, investments:, whitelists: [], include_refund_amount: false,
               rollover_investments: [])

  # make sure is hashes
  original_investments = investments.as_json.map(&:symbolize_keys)
  whitelists = whitelists.as_json.map(&:symbolize_keys)
  investments = investments.as_json.map(&:symbolize_keys)
  rollover_investments = rollover_investments.as_json.map(&:symbolize_keys)

  ## rollover investment is guaranteed, so it should decrease the hard cap
  rollover_investments.map do |rollover_investment|
    hard_cap = ::Istox::FMath.sub(hard_cap, rollover_investment[:fiat_amount])
  end

  # process whitelist
  whitelists.each do |whitelist|
    whitelisted_investments = investments.select { |investment1| investment1[:account_id] == whitelist[:account_id] }

    next unless whitelisted_investments.length.positive?

    current_guarenteed_amount = ::BigDecimal.new(whitelist[:guaranteed_allocation].to_s)

    whitelisted_investments.each do |whitelisted_investment|
      granted_amount = [::BigDecimal.new(whitelisted_investment[:fiat_amount].to_s), current_guarenteed_amount].min

      next unless granted_amount.positive?

      current_guarenteed_amount = ::Istox::FMath.sub(current_guarenteed_amount, granted_amount).to_d

      hard_cap = ::Istox::FMath.sub(hard_cap, granted_amount)
      whitelisted_investment[:fiat_amount] = Istox::FMath.sub(whitelisted_investment[:fiat_amount], granted_amount)
      whitelisted_investment[:is_vip] = true
      whitelisted_investment[:granted_amount] = granted_amount.to_s
    end
  end

  # sort by id asc
  interests = investments.sort do |a, b|
    a[:id] <=> b[:id]
  end

  ## check whether each investment already had earlier investment from the same investor
  interests = interests.map do |interest|
    earlier_interest = interests.find do |i|
      i[:account_id] == interest[:account_id] &&
        i[:id] != interest[:id] && i[:id].to_i < interest[:id].to_i
    end

    interest[:has_earlier_interest] = earlier_interest.present?

    interest
  end

  total_interests = 0

  max_allowed_investor = Istox::FMath.round_down(::Istox::FMath.div(hard_cap, min_investment), 0).to_i

  allowed_investor_ids = []
  interests.each_with_index.map do |interest|
    if !allowed_investor_ids.include?(interest[:account_id]) &&
       interest[:fiat_amount].to_d.positive? && allowed_investor_ids.length < max_allowed_investor
      allowed_investor_ids.push(interest[:account_id])
      interest[:to_be_set_zero] = false
      total_interests = ::Istox::FMath.add(total_interests, interest[:fiat_amount])
    elsif allowed_investor_ids.include?(interest[:account_id]) && interest[:fiat_amount].to_d.positive?
      interest[:to_be_set_zero] = false
      total_interests = ::Istox::FMath.add(total_interests, interest[:fiat_amount])
    else
      interest[:to_be_set_zero] = true
    end
  end

  # only need to handle when oversubscribe
  if total_interests.to_d > hard_cap.to_s.to_d

    # prorate the interests
    interests = interests.each_with_index.map do |interest|
      investment = if interest[:fiat_amount].to_d.positive? && !interest[:to_be_set_zero]
                     result = ::Istox::FMath.round_down(::Istox::FMath.mul(::Istox::FMath.div(interest[:fiat_amount], total_interests),
                                                                           hard_cap), 0)

                     result = result.to_d - result.to_d.modulo(invest_step.to_s.to_d)

                     # only set to min investment if is not vip
                     if result < min_investment.to_d && interest[:is_vip].blank? && !interest[:has_earlier_interest]
                       result = min_investment.to_d
                     end

                     result
                   else
                     ::BigDecimal.new('0').to_s
                   end

      {
        id: interest[:id],
        is_vip: interest[:is_vip],
        granted_amount: interest[:granted_amount],
        has_earlier_interest: interest[:has_earlier_interest],
        investment: investment.to_s
      }
    end

    new_total_interests = '0'
    interests.each do |interest|
      new_total_interests = ::Istox::FMath.add(new_total_interests, interest[:investment])
    end

    # need to do adjustment if summation of new rounded values still larger than
    if new_total_interests.to_d > hard_cap.to_s.to_d
      total_deducting = ::Istox::FMath.sub(new_total_interests, hard_cap)
      interests.reverse_each do |interest|
        next unless interest[:investment].to_d > min_investment.to_d || interest[:is_vip] || interest[:has_earlier_interest]

        # allow to deduct to zero if is vip
        deductable = if interest[:is_vip] || interest[:has_earlier_interest]
                       interest[:investment]
                     else
                       ::Istox::FMath.sub(interest[:investment], min_investment)
                     end

        if deductable.to_d > total_deducting.to_d
          interest[:investment] = ::Istox::FMath.sub(interest[:investment], total_deducting)
          total_deducting = 0
        else
          interest[:investment] = ::Istox::FMath.sub(interest[:investment], deductable)
          total_deducting = ::Istox::FMath.sub(total_deducting, deductable)
        end
      end
    end

    final_interests = interests.map do |interest|
      interest[:investment] = ::Istox::FMath.add(interest[:investment], interest[:granted_amount]) if interest[:granted_amount].present? &&
                                                                                                      interest[:granted_amount].to_d.positive?
      interest.delete(:is_vip)
      interest.delete(:granted_amount)
      interest.delete(:has_earlier_interest)

      if include_refund_amount
        original_investment = original_investments.find { |original_investment1| original_investment1[:id] == interest[:id] }
        interest[:refund_amount] = original_investment.present? ? ::Istox::FMath.sub(original_investment[:fiat_amount], interest[:investment]) : '0'
      end
      interest
    end

  else

    final_interests = interests.each_with_index.map do |interest|
      final_amount = if interest[:is_vip]
                       vip_fiat_amount = !interest[:to_be_set_zero] ? interest[:fiat_amount] : '0'
                       ::Istox::FMath.add(vip_fiat_amount, interest[:granted_amount])
                     else
                       !interest[:to_be_set_zero] ? interest[:fiat_amount] : '0'
                     end

      result = {
        id: interest[:id],
        investment: ::BigDecimal.new(final_amount.to_s).to_s

      }

      if include_refund_amount
        original_investment = original_investments.find { |original_investment1| original_investment1[:id] == interest[:id] }
        refund_amount = ::Istox::FMath.sub(original_investment[:fiat_amount], final_amount)
        result[:refund_amount] = refund_amount
      end

      result
    end
  end

  transform_rollover_investments = rollover_investments.map do |rollover_investment|
    rollover_investment[:investment] = ::BigDecimal.new(rollover_investment[:fiat_amount].to_s).to_s
    rollover_investment[:refund_amount] = ::BigDecimal.new(0).to_s if include_refund_amount

    rollover_investment.select { |k, _v| %i[id investment refund_amount].include?(k) }
  end

  {
    cutoff_price: token_price.to_s,
    interests: final_interests.concat(transform_rollover_investments)
  }
end