require "uri"
require 'url_expander'

module JApiAgent::ContentParser
  class ParserBase
    def initialize(args)
      args.each do |k,v|
        instance_variable_set("@#{k}", v)
      end
    end
    def self.instagram_image(url)
      image = ""
      doc = Nokogiri::HTML(open(url)) rescue nil
      return image if doc.nil?
      image_tags = doc.css("img.photo")
      image = image_tags.first['src'] unless image_tags.blank?
      image
    end
    def self.path_image(url)
      image = ""
      doc = Nokogiri::HTML(open(self.change_url_scheme(url,"https")))
      image_tags = doc.css("img.photo-image")
      image = image_tags.first['src'] unless image_tags.blank?
      image
    end

    def self.change_url_scheme(url,scheme)
      u= URI(url)
      u.scheme="https"
      u.to_s
    end
    def self.youtube_id(url)
      uri = URI(url)
      return self.youtu_be_id(uri) if uri.host == "youtu.be"
      return "" unless uri && uri.query
      u = uri.query.split("&")
      id = u.select{|x| x =~/^v=/}.first if u
      id.nil? ? "" : id.delete("v=")
    end
    def self.youtu_be_id(url)
     url.path[1..-1]
    end
    def self.first_image(url)
      self.get_first_image(open(url)) rescue ""
    end
    def self.get_first_image(content)
      image_src = ""
      doc = Nokogiri::HTML(content)
      return "" if doc.nil?
      og_image = doc.xpath("//meta[@property='og:image']")
      #image_tags = doc.xpath('//img')
      #image_src = image_tags.first['src'] if !image_tags.blank? && image_tags.first['src'] =~ /^http/ && (image_tags.first['src'] =~ /(flickr|yimg|stats.wordpress.com|b.scorecardresearch.com)/) == nil
      image_src = ""
      image_src = og_image.first['content'] unless og_image.blank?
      return ""  if (image_src =~ /^http/) == nil  || (image_src =~ /(flickr|yimg|stats.wordpress.com|b.scorecardresearch.com|statse.webtrendslive.com)/)
      return image_src
    end
    def self.facebook_image_processing(content)
      doc = Nokogiri::HTML(content)
      return content unless doc
      image_tags = doc.xpath('//img')
      image_tags.each {|x| self.facebook_image_tag_processing(x)} if image_tags
      doc.css('body').inner_html
    end
    def self.facebook_image_tag_processing(tag)
      url = URI(tag['src'])
      if url.to_s =~ /(yimg|flickr)/
        tag.remove
        return
      end
      source_url = url.query.split('&').select{|x| x =~ /^url=/ || x =~ /^src=/}.first if url.query
      tag.delete("style")
      tag.delete("width")
      tag.delete("height")

      if source_url
        tag['src'] = CGI.unescape(source_url[4..-1])
        return
      else
        tag['src'] = self.facebook_image_expander(url.to_s)
      end
    end

    def self.facebook_url_processing(content)
      doc = Nokogiri::HTML(content)
      return content unless doc
      a_tags = doc.xpath('//a')
      a_tags.each do |x|
        if x['href'] && !x['href'].empty?
          x['href'] = x['href'].split('/l.php?u=').last.split('&').first
        end
      end
      doc.css('body').inner_html
    end

    def self.url_expander(url)
      UrlExpander::Client.expand(url)
    end

    def self.facebook_image_expander(url)
      if (url =~ /fbcdn.net/ && url =~ /_(s|t|n)\.jpg/)
        return url.gsub(/_(s|t|n).jpg$/,"_o.jpg")
      elsif (url =~ /fbcdn.net/ && url =~ /_(s|t|n)\.png/)
        return url.gsub(/_(s|t|n).png$/,"_o.png")
      else
        url
      end
    end

    def self.simple_truncate(string,length)
      string.slice(0,length)+"..." unless string.nil?
    end
  end
end