module Fc2Get

# File lib/fc2_get.rb, line 23
def decode_params params_str
  Hash[params_str.scan(/([^=]+)=([^&]*)&?/)]
end

# File lib/fc2_get.rb, line 32
def download video_id, path = '.'
  video_uri = download_uri(video_id)
  file_path = File.directory?(path) ?
              File.expand_path(File.basename(video_uri.path), path) : path
  raise FileExists.new "path: #{file_path}", file_path if File.exist? file_path
  Net::HTTP.get_response(video_uri) do |res|
    size, total = 0, res.header['Content-Length'].to_i
    open file_path, 'w' do |io|
      res.read_body do |chunk|
        io.write chunk
        size += chunk.size
        print "%d%% done (%d of %d)\r" % [(size * 100) / total, size, total]
      end
    end
  end
end

# File lib/fc2_get.rb, line 27
def download_uri video_id
  params = decode_params(open(params_uri(video_id)).read)
  URI("#{params['filepath']}?mid=#{params['mid']}")
end

# File lib/fc2_get.rb, line 15
def mimi(video_id)
  Digest::MD5.hexdigest(video_id + '_gGddgPfeaf_gzyr')
end

# File lib/fc2_get.rb, line 19
def params_uri video_id
  URI("http://video.fc2.com/ginfo.php?mimi=#{mimi(video_id)}&upid=#{video_id}")
end