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# -*- coding: utf-8 -*-
#/usr/bin/env ruby

# 入力した文章から感情を読み取る
# $Id:$

require 'tempfile'

class PN

  def PN.process(args, default_io)
    pn = PN.new()
    pn.analyze
  end

  # SETTINGS
  def initialize()
    @mecab = 'mecab'
    @mecab_option = '--node-format="%H:%m\n" --bos-format="" --eos-format="" --unk-format="" --eon-format=""'
    @dic = Hash.new
    # http://www.lr.pi.titech.ac.jp/~takamura/pndic_ja.html
    load_dic("pn_ja.txt")
  end
  
  def load_dic(filename)
    open(filename){|file|
      while line = file.gets
	line.strip!
      # 見出し語:読み:品詞:感情極性実数値
        (word, yomi, part, value) = line.split(":")
        @dic[word] = value
      end
    }
#    @dic.each_pair{|key, value|
#      puts "#{key}:#{value}"
#    }
  end

  # analyze
  def analyze(src)
#    src = "私は良かったです。"
    analyze_qn_core(src)
  end
  
  def analyze_qn_core(src)
    temp = Tempfile.new("temp")
    temp.puts src
    temp.close
    tempfilename = temp.path

    wc = 0.0
    score = 0.0

    open("| cat #{tempfilename} | \
    #{@mecab} #{@mecab_option}", "r"){|file|
      while line = file.gets
        line.strip!
	word = line.split(":")[-1]
       if @dic.key?(word) then 
#          p @dic[word].to_f
          score = score + @dic[word].to_f
  #        p word
	wc = wc + 1
        end
      end
    }
    score = score / wc if wc != 0
#    p score
    return score
  end

end

if $0 == __FILE__
  PN.process(ARGV, STDIN)
end