module Lolcommits
  class Loltext < Plugin

    def initialize(runner)
      super

      @font_location = runner ? runner.font : nil

      self.name    = 'loltext'
      self.default = true
    end

    def run
      mm_run
    end

    # use minimagick wrapper
    def mm_run
      font_location = @font_location || File.join(Configuration::LOLCOMMITS_ROOT, "vendor", "fonts", "Impact.ttf")

      plugdebug "Annotating image via MiniMagick"
      image = MiniMagick::Image.open(self.runner.main_image)
      image.combine_options do |c|
        c.gravity 'SouthWest'
        c.fill 'white'
        c.stroke 'black'
        c.strokewidth '2'
        c.pointsize '48'
        c.interline_spacing '-9'
        c.font font_location
        c.annotate '0', clean_msg(self.runner.message)
      end

      image.combine_options do |c|
        c.gravity 'NorthEast'
        c.fill 'white'
        c.stroke 'black'
        c.strokewidth '2'
        c.pointsize '32'
        c.font font_location
        c.annotate '0', self.runner.sha
      end

      plugdebug "Writing changed file to #{self.runner.main_image}"
      image.write self.runner.main_image
    end

    private

    # do whatever is required to commit message to get it clean and ready for imagemagick
    def clean_msg(text)
      wrapped_text = word_wrap text
      escape_quotes wrapped_text
      text = scrub_profanity text
    end


    #search the commit for profanity and if it exists remove the commit
    def scrub_profanity(text)
      profanity = ["fuck", "bitch", "cunt", "hate", "pissed", "balls", "screw", "ACM",
                   "ass"]
      out = ""
      text.split(' ').each do |word|
        word = '$$$' if profanity.include? word
        out += ( word + ' ')
      end
      out
    end
    # conversion for quotation marks to avoid shell interpretation
    # does not seem to be a safe way to escape cross-platform?
    def escape_quotes(text)
      text.gsub(/"/, "''")
    end

    # convenience method for word wrapping
    # based on https://github.com/cmdrkeene/memegen/blob/master/lib/meme_generator.rb
    def word_wrap(text, col = 27)
      wrapped = text.gsub(/(.{1,#{col + 4}})(\s+|\Z)/, "\\1\n")
      wrapped.chomp!
    end
  end
end