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#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
# fixheader.rb --in_csv "./abc.csv

require 'csv'
require 'optparse'

class Header
  def initialize
    params = optparse
    @in_csv = params['in_csv'].encode('UTF-8')
    @in_skip_lines = params['in_skip_lines'].to_i
    has_double_quote = has_double_quote? open_header(@in_csv, @in_skip_lines)
    save_file(@in_csv, fix(@in_csv, @in_skip_lines)) if has_double_quote
  end

  def fix(file, skip_lines)
    lines = open_file file
    words = chop_both(lines[skip_lines]).split(/","/)
    lines[skip_lines] =
      array_zip(words
                   .uniq
                   .map { |x| array_autonum(x, words) })
      .map { |xs| xs.map(&:to_s).inject { |a, b| a + b } }
      .to_csv
    lines
  end

  def array_zip(array)
    array.first.zip(*array.drop(1))
  end

  def array_autonum(uniq_keyword, words, count = 0, array = [])
    if words.first.to_s == uniq_keyword.to_s && count != 0
      column = words.first.to_s + '.' + count.to_s
      count += 1
    elsif words.first.to_s == uniq_keyword.to_s && count.zero?
      column = words.first.to_s
      count += 1
    elsif words == []
      return array
    else
      column = nil
    end
    array_autonum(uniq_keyword, words.drop(1), count, array.push(column))
  end

  def chop_both(str)
    str.slice(1, str.length - 3)
  end

  def open_file(file)
    lines = IO.readlines(file, mode: 'rt:UTF-8')
    lines
  end

  def open_header(file, skip_lines)
    header = ''
    count = 1 - skip_lines
    File.foreach(file, mode: 'rt:UTF-8') { |line|
      header = line if count == 1
      count += 1
      #p count
    }
    header
  end

  def has_double_quote?(str)
    if str[0] == '"'
      true
    else
      false
    end
  end

  def save_file(file, lines)
    File.write(file, lines.inject { |a, b| a.to_s + b.to_s })
    print_log
  end

  def print_log
    puts 'in_csv: ' + @in_csv
    puts 'in_column: ' + @in_skip_lines.to_s
    puts 'Done.'
    puts '--------------------------------------------------'
  end

  def optparse
    params = ARGV.getopts('', 'in_csv:', 'in_skip_lines:0')
    params
  end
end

Header.new if $PROGRAM_NAME == __FILE__