class JekyllThumbnail

# File lib/jekyll-thumbnail.rb, line 19
def initialize(tag_name, markup, tokens)
  if /(?<source>[^\s]+)\s+(?<dimensions>[^\s]+)/i =~ markup
    @source = source
    @dimensions = dimensions
  end
  super
end

# File lib/jekyll-thumbnail.rb, line 9
def look_up(context, name)
  lookup = context

  name.split(".").each do |value|
    lookup = lookup[value]
  end

  lookup
end

# File lib/jekyll-thumbnail.rb, line 27
def render(context)
  if @source

    # parking
    # also put the parameters into the liquid parser again, to allow variable paths
    source = @source
    source = look_up context, source unless File.readable?(source)
    dimensions = @dimensions

    source_path = "#{source}"
    raise "#{source_path} is not readable" unless File.readable?(source_path)
    ext = File.extname(source)
    desc = dimensions.gsub(/[^\da-z]+/i, '')
    dest_dir = "#{File.dirname(source)}/thumbs"
    Dir.mkdir dest_dir unless Dir.exists? dest_dir
    dest = "#{dest_dir}/#{File.basename(source, ext)}_#{desc}#{ext}"
    dest_path = "#{dest}"

    # only thumbnail the image if it doesn't exist tor is less recent than the source file
    # will prevent re-processing thumbnails for a ton of images...
    if !File.exists?(dest_path) || File.mtime(dest_path) <= File.mtime(source_path)
      # puts ENV.inspect

      puts "Thumbnailing #{source} to #{dest} (#{dimensions})"

      image = MiniMagick::Image.open(source_path)
      image.strip
      image.resize dimensions
      image.quality 60

      second_image = MiniMagick::Image.new("img/watermark-#{dimensions}.png")

      result = image.composite(second_image) do |c|
        c.compose "Over"    # OverCompositeOp
        c.geometry "+20+20" # copy second_image onto first_image from (20, 20)
      end

      result.write dest_path
    end

    """<img src='#{dest}' />"""

    # TODO support relative paths
  else
    "Could not create thumbnail for #{source}. Usage: thumbnail /path/to/local/image.png 50x50"
  end
end