require 'ordered_hash'

class BalanceSheet < ActiveSupport::OrderedHash

  attr_accessor :assets, :liabilities, :MAX, :RESERVE_REQUIREMENT, :name, :DEBUG

  def initialize(name = 'Balance Sheet', *args)
    super(name)
    @MAX = 40 
    @name = name
    @headers = []
    args.each { |header|
      @headers.push(header)
    }
    @assets = Array.new
    @liabilities = Array.new
    @RESERVE_REQUIREMENT = 0.2
    @asset_total = 0.0
    @liability_total = 0.0
    @DEBUG = 0
    #@DEBUG = 1
    #@outstanding_loans = 0.0
    self['assets'] = @assets
    self['liabilities'] = @liabilities
  end

  def draw(maxstring = 16)
    puts;puts
    max = getLongestString(); max += 3
    if maxstring > max then max = maxstring end
    if max > @MAX then max = @MAX end
    #puts "max==#{max}"
    total = 2*max+3
    puts @name.center(total)
    @headers.each { |header|
      puts header.center(total)
    }
    printf("%-#{max}s | %#{max}s", "assets","liabilities")
    puts
    total.times { print '-' }; puts
    total_assets = 0; total_liabilities = 0
    self['assets'].each_with_index { |element, index|
      begin 
        if element =~ /\$(\d+[.,]?\d*)(.*)/
          asset_value = $1.to_f; rest = $2.to_s
          total_assets += asset_value
          formatted_element = sprintf("$%.2f%s", asset_value, rest)
          if formatted_element == "$0.00" then formatted_element = ' ' end
        else; formatted_element = element; end
      rescue; end
      begin      
        if self['liabilities'][index] =~ /\$(\d+[.,]?\d*)(.*)/
          liability_value = $1.to_f
          total_liabilities += liability_value
          formatted_liability = sprintf("$%.2f%s", liability_value, $2.to_s)
          if formatted_liability == "$0.00" then formatted_liability = ' ' end
        else; formatted_liability = self['liabilities'][index]; end
      rescue; end
      #TODO: nicely wrap entries that are longer than @MAX
      #printf("%-#{max}s | %#{max}s", element, self['liabilities'][index])
      printf("%-#{max}s | %#{max}s", formatted_element, formatted_liability)
      puts
      #printf("%-#{max}s | %#{max}s", ' ', ' '); puts # insert blank line
      #printf("%-#{max}s | %#{max}s", ' ', ' '); puts # insert blank line
    }
    printf("%-#{max}s | %#{max}s", ' ', ' '); puts # insert blank line
    formatted_total_assets = sprintf("%.2f", total_assets)
    formatted_total_liabilities = sprintf("%.2f", total_liabilities)
    printf("%-#{max}s | %#{max}s", "Total: $#{formatted_total_assets}", "Total: $#{formatted_total_liabilities}")
    puts;puts
    @asset_total = total_assets; @liability_total = total_liabilities
    return
  end

  def getLongestString()
    if @assets.length == 0
      @assets.push(' ')
    end
    while @assets.length > @liabilities.length
      @liabilities.push(' ')
    end
    while @assets.length < @liabilities.length
      @assets.push(' ')
    end
    #puts @assets, @liabilities  
    max = @assets.max{ |c1, c2| c1.length <=> c2.length }
    max2 = @liabilities.max{ |c1, c2| c1.length <=> c2.length }
    return max.length unless max2.length > max.length
    max2.length
  end

  def lend_long(loan_to = "loan")
    # calculate reserve and outstanding loan totals
    reserves = 0.0
    outstanding_loans = 0.0
    @assets.each { |asset|
      puts "asset: #{asset}" unless @DEBUG == 0
      if asset =~ /\$(\d+[.,]?\d*) reserves/
        begin
          reserves += $1.to_f
          puts "reserves 1: #{reserves}" unless @DEBUG == 0
        rescue; end
        next
      end
      if asset =~ /\$(\d+[,.]?\d*) loan/
        begin
          value = $1.to_f
          outstanding_loans = value
        rescue; end
      end
    }
    new_reserves = @liability_total * @RESERVE_REQUIREMENT
    #new_reserves = (new_reserves*100).round / 100.0
    puts "new_reserves: #{new_reserves}" unless @DEBUG == 0
    puts "reserves: #{reserves}" unless @DEBUG == 0
    puts "outstanding_loans: #{outstanding_loans}" unless @DEBUG == 0
    amount_to_lend_long = reserves - new_reserves #- outstanding_loans
    #amount_to_lend_long = outstanding_loans + (reserves - new_reserves)
    puts "amount_to_lend_long: #{amount_to_lend_long}" unless @DEBUG == 0
    
    # now, reset reserves, and lend long
    #@assets.each { |asset|
    #  if asset =~ /$(\d+[.,]?\d*) reserves/
    #    asset = "$#{new_reserves} reserves"
    #  end
    #}
    @assets.map! { |asset| asset =~ /\$(\d+[.,]?\d*) reserves/ ? "$#{new_reserves} reserves" : asset }
    @assets.uniq!
    @assets.push("$#{amount_to_lend_long} #{loan_to}")
    return amount_to_lend_long
  end

end