deal_allocation.rb

class Deal < AR
  attr_reader :minimum_order, :board_lot_size, :unit_value, :allocation_value
end

# last level allocation rate
# planned allocations
# deal

class DealAllocation < AR
  belongs_to :deal
  has_many :expressions_of_interest, :through => :deal
  has_many :allocation_plan_items

  attr_accessor :remaining_units

  def by_rank(rank)
    expressions_of_interest.select {|e| e.rank ==  rank}
  end
  
  def rank_total(rank)
    by_rank(rank).sum(&:units_calculated)
  end

  def partial_rank
    expressions_of_interest.select {|eoi| [:partial, :no].include? eoi.within_deal_allocation? }.first.eoi_member_rank
  end
end

class Allocation::ExpressionOfInterest
  
  attr_reader :expression_of_interest, :deal_allocation
  
  def initialize(expression_of_interest, deal_allocation)
    # allocation_plan_item = Allocation::AllocationPlanItem.plan_for_rank(self.rank)
    @deal_allocation = deal_allocation
    @expression_of_interest = expression_of_interest
    
  end
  
  def self.from_deal_allocation(deal_allocation)
    deal_allocation.expressions_of_interest.map {|eoi| new(eoi, deal_allocation)}.sort_by {}
  end
  
  def in_partial_rank?
    deal_allocation.partial_rank == self.eoi_member_rank
  end

  
  # expression_of_interest
  def date_of_interest
    expression_of_interest.created_at
  end
  
  # expression_of_interest
  def eoi_member_rank
    expression_of_interest.member
  end
  
  # expression_of_interest
  def eoi_amount_requested
    expression_of_interest.eoi_amount_requested
  end
  
  # expression_of_interest
  def eoi_units_requested
    expression_of_interest.eoi_units_requested
  end
  
  # deal_allocation
  def amount_calculated
    units_calculated * deal.unit_price
  end
  
  # allocation_plan, #deal <-- could use expression of interest insead of deal
  def units_calculated
    if in_partial_rank?
      units_calculated_by_percent
    else
      units_calculated_by_strategy
    end
  end
  
  def units_calculated_by_percent(allocation_percentage = 1.0, remaining_percentage = 0.37)
    requested_units * remaining_percentage * allocation_percentage 
    # result = alloction_plan.percentage_strategy(requested_units, allocation_percentage)
    return 0 if result == 0
    [result.rounded_down(board_lot_size), minimum].max
  end

  def units_calculated_by_strategy
    result = allocation_plan.calculate(requested_units)
    return 0 if result == 0
    [result.rounded_down(board_lot_size), minimum].max
  end

  # deal_allocation
  def percentage_of_deal_unit_allocation
    (units_calculated / deal.total_unit_allocation).as_percent
  end
  
  # deal_allocation
  def cumulative_percentage_of_deal_unit_allocation
    if deal_allocation.previous_expression_of_interest(self)
      deal_allocation.previous_expression_of_interest(self).cumulative_percentage_of_deal_unit_allocation + percentage_of_deal_unit_allocation
    else
      percentage_of_deal_unit_allocation
    end
  end
  
  def within_deal_allocation?
    if cumulative_percentage_of_deal_unit_allocation < 100
      :yes
    elsif cumulative_percentage_of_deal_unit_allocation - percentage_of_deal_unit_allocation < 100
      :partial
    else
      :no
    end
  end
end

class Allocation::AllocationPlanItem < AR
  attr_reader :rank
  attr_reader :rank_plan, :rank_demand
  
  def self.plan_for_rank(rank)
    # looks up the plan for a rank
  end
end

class Allocation::InvestorRankPlan
  attr_accessor :units
  attr_reader :percentage
  
  def calculate(units)
    # result will be rounded to the board lot size
    (units * percentage).rounded(board_lot_size)
  end
end

class Allocation::InvestorRankEOIDemand
  attr_reader :value
  
  def units
    value * something
  end
end

put, :update, :id => deal_allocation_id, :deal_allocation => {:remainder_allocation_percentage => 25, :allocation_plan_item_attributes => [{:id => 1, :units_allocated => 10000}]}

def update
  @deal_allocation = find(params[:id])
  @deal_allocation.update_attributes(params[:deal_allocation])
end

def show
  @deal_allocation = find(params[:id])
  Allocation::ExpressionOfInterest.from_deal_allocation(@deal_allocation)
end