module Gown

# File lib/gown.rb, line 8
def patterns
  patterns_to_remove = (
    Gown::Patterns::KGP_lifecycle + 
    Gown::Patterns::KGP_warnings +
    Gown::Patterns::KGP_metadata +
    Gown::Patterns::KGP_traffic +
    Gown::Patterns::CHANNEL_events +
    Gown::Patterns::MAIN_lifecycle
  ).map {|pattern| Regexp.new (Gown::Patterns::Timestamp + pattern)}

  return patterns_to_remove
end

# File lib/gown.rb, line 21
def strip input
  patterns_to_remove = patterns
  output = ""

  input.each do |line|
    if line.match /^[[:space:]]*$/
      # blank_lines_removed +=1
    else
      filtered = patterns_to_remove.find { |pattern| pattern.match line }
      if !filtered
        output.append line
      else
        # lines_removed+= 1
      end
    end
  end

  return output
end

# File lib/gown.rb, line 41
def strip_file input_filename, output_filename
  patterns_to_remove = patterns

  puts "Checking for #{patterns_to_remove.length} patterns"

  spinner = TTY::Spinner.new("[:spinner] Parsing #{input_filename}")
  begin

    lines_removed = 0
    blank_lines_removed = 0

    spinner.auto_spin
    input = File.open input_filename
    input.advise(:sequential)

    output = File.new output_filename, "a"

    input.each do |line|
      if line.match /^[[:space:]]*$/
        blank_lines_removed +=1
      else
        filtered = patterns_to_remove.find { |pattern| pattern.match line }
        if !filtered
          output.puts line
        else
          lines_removed+= 1
        end
      end
    end

    status = " -- Removed #{lines_removed} lines"
    status << ", #{blank_lines_removed} blank lines" if blank_lines_removed > 0
    spinner.success status
  rescue => e
    spinner.error "Something dire happened!"
    puts e
  ensure
    input.close if input
    output.close if output
  end
end