#!/usr/bin/env ruby
require 'optparse'
require 'csv'

# This program may be distributed under the terms of the
# Public Distribution License: http://pdl.apotheon.org

def set_values( path )
  CSV.readlines(path).collect do |stats|
    [ stats[0], [ stats[1].to_f, stats[2].to_f ] ]
  end
end

def decel_curve( statistics )
  statistics.collect do |stats|
    [ stats[0], 10 - (stats[1][0] / stats[1][1]) ]
  end.sort! {|a,b| a[1] <=> b[1]}.reverse
end

def split_percent( statistics )
  statistics.collect do |stats|
    name = stats[0]
    neg = stats[1][0]
    pos = stats[1][1]

    if neg == pos
      [name, 5]
    elsif neg > pos
      [name, (5 * pos / neg)]
    elsif neg < pos
      [name, (10 - 5 * neg / pos)]
    end
  end.sort! {|a,b| a[1] <=> b[1]}.reverse
end



help_text = {
  :type => "Specify the type of output you want.  At
                                     this time, the only option that has been
                                     implemented is 'd', which indicates a
                                     decelerating curve function whose maximum
                                     output value is 10.00.  If the '-t' option
                                     is not specified, the default of a linear
                                     function whose output value ranges between
                                     0.00 and 10.00 is used."
}



if $0 == __FILE__
  type = 't'

  opts = OptionParser.new do |opts|
    opts.on('--type=OUT_TYPE', '-t=OUT_TYPE', help_text[:type]) do |val|
      type = val
    end
  end

  opts.parse!
  path = ARGV[0]

  statistics = set_values(path)

  if type == 'd'
    decel_curve(statistics)
  else
    split_percent(statistics)
  end.each do |record|
    print record[0], ' : '
    printf("%.2f\n", record[1])
  end
end