require 'nokogiri'
require 'open-uri'
require 'net/http'
require 'image_spec'

module Linkser
  module Parser
    class HTML
      def parse url, options={}
        parsed_page = Hash.new

        doc = Nokogiri::HTML(open(url))

        doc.css('title').each do |title|
          parsed_page.update({:title => title.text})
        end

        doc.css('meta').each do |meta|
          if meta.get_attribute("name").eql? "description"
            parsed_page.update({:description => meta.get_attribute("content")})
          end
        end

        images = Array.new

        doc.css('img').each do |img|
          img_src = img.get_attribute("src")
          img_src = get_complete_url img_src, url
          img_uri = URI.parse(img_src)
          img_ext = File.extname(img_uri.path)
          img_name = File.basename(img_uri.path,img_ext)
          if [".jpg", ".jpeg", ".png"].include? img_ext
            begin
              img_spec = ImageSpec.new(img_src)
              w = img_spec.width.to_f
              h = img_spec.height.to_f
              if w > 199 or w > 199
                if ((w > 0 and h > 0 and ((w / h) < 3) and ((w / h) > 0.2)) or (w > 0 and h == 0 and w < 700) or (w == 0 and h > 0 and h < 700)) and img_name.index("logo").nil?
                  image = {:img => img_src, :width => w.to_i, :height => h.to_i}
                images << image
                end
              end
            rescue
            end
          end
        end

        if images!=[]
          parsed_page.update({:images => images})
        end

        return parsed_page
      end

      private

      def get_complete_url src, url
        uri = URI.parse(url)
        base_url = "http://" + uri.host + (uri.port!=80 ? ":" + uri.port.to_s : "")
        relative_url = "http://" + uri.host + (uri.port!=80 ? ":" + uri.port.to_s : "") + uri.path
        if src.index("http://")==0
        src = src
        #stays the same
        elsif src.index("/")==0
        src = base_url + src
        else
        src = relative_url + src
        end
      end
    end
  end
end