class Bismas::CLI::Chardiff

# File lib/bismas/cli/chardiff.rb, line 35
def self.defaults
  super.merge(
    file1_encoding:  DEFAULT_ENCODING,
    file2_encoding:  DEFAULT_ENCODING,
    output_encoding: Encoding.default_external
  )
end

# File lib/bismas/cli/chardiff.rb, line 43
def run(arguments)
  quit unless arguments.empty?

  output_encoding, frequencies = options[:output_encoding],
    Hash.new { |h, k| h[k] = Hash.new { |i, j| i[j] = [0, 0] } }

  2.times { |index|
    file = "file#{index + 1}"

    reader_options = {
      encoding: "#{options[:"#{file}_encoding"]}:#{output_encoding}",
      key: key = options[:"#{file}_key"]
    }

    Reader.parse_file(options[file.to_sym], reader_options) { |id, record|
      frequency = Hash.new(0); record.delete(key)

      record.each_value { |array| array.each { |value|
        value.each_char { |char| frequency[char] += 1 } } }

      frequencies.values_at(0, key ? id.to_i : $.).each { |hash|
        frequency.each { |char, count| hash[char][index] += count } }
    }
  }

  File.open_file(options[:output], {}, 'w') { |io|
    begin
      csv = CSV.new(io) << %w[id char count1 count2 diff]

      frequencies.sort_by { |id,| id }.each { |id, hash|
        hash.sort_by { |char,| char }.each { |char, (count1, count2)|
          unless count1 == count2
            csv << [id, char, count1, count2, count2 - count1]
          end
        }
      }
    ensure
      csv.close if csv
    end
  }
end

# File lib/bismas/cli/chardiff.rb, line 87
def opts(opts)
  opts.option(:file1__FILE, :i, 'Path to input file 1 [Required]')
  opts.option(:file2__FILE, :j, 'Path to input file 2 [Required]')

  opts.separator

  opts.option(:output__FILE, 'Path to output file [Default: STDOUT]')

  opts.separator
  opts.separator 'Input options:'

  opts.option(:file1_encoding__ENCODING, :N, "File 1 encoding [Default: #{DEFAULT_ENCODING}]")
  opts.option(:file2_encoding__ENCODING, :O, "File 2 encoding [Default: #{DEFAULT_ENCODING}]")

  opts.separator

  opts.option(:file1_key__KEY, :K, 'ID key of file 1')
  opts.option(:file2_key__KEY, :L, 'ID key of file 2')

  opts.separator
  opts.separator 'Output options:'

  opts.option(:output_encoding__ENCODING, :n, "Output encoding [Default: #{defaults[:output_encoding]}]")
end