require 'ostruct'

module MephistoFlickr
   
  class RecentFlickrPhotos < Liquid::Block   
    Syntax = /((#{Liquid::TagAttributes}\s?,?\s?)*)as\s(#{Liquid::VariableSegment}+)/
    
    def initialize(markup, tokens)
      super
      if markup =~ Syntax
        @options = parse_options($1)
        @as = $5
        
        @flickr = Flickr.new(@options[:api_key])
      else
        raise Liquid::SyntaxError.new("Syntax Error in tag 'recentflickrphotos' - Valid syntax: recentflickrphotos [ opt : 'val', opt : 'val' ] as [name]")
      end
    end
    
    def render(context)
      # get the photo list from flickr as an xml-simple hash, they come in order of most recently added
      photos = @flickr.request("people.getPublicPhotos", :user_id => @options[:user_id], :extras => 'tags')['photos']['photo']

      # filter out photos without specified tag
      photos = photos.find_all { |photo| photo['tags'].include? @options[:tag] } if @options[:tag]
      
      # have to do one request per photo to get complete description
      # we also merge the tags from the orginal response as the tags from photos.getInfo is too much information
      
      photos = photos.map { |p| @flickr.request("photos.getInfo", :photo_id => p['id'])['photo'].merge('tags' => p['tags']) }

      # convert that hash into something for liquid
      photos = photos.map do |photo|
        base_url = "http://static.flickr.com/#{photo['server']}/#{photo['id']}_#{photo['secret']}"
        photo.merge(
          'medium_thumb' => "#{base_url}_m.jpg", 
          'link' => "http://www.flickr.com/photos/oddfresh/#{photo['id']}",
          'tags' => photo['tags'].split(' '),
          # for some reason a blank description is an empty hash instead of empty string
          'description' => photo['description'].blank? ? '' : photo['description'] 
        )
      end

#      returning result = [] do |result|
#        photos.each_with_index do |item, index|
#          context.stack do 
#            context['recentflickrphotos'] = { 'index' => index + 1 }
#            context[@as] = item
#            result << render_all(@nodelist, context)
#          end
#        end
#      end 

      result = []
      photos.each_with_index do |item, index|
        context.stack do 
          context['recentflickrphotos'] = { 'index' => index + 1 }
          context[@as] = item
          result << render_all(@nodelist, context)
        end
      end
      result
    end
    
    private
      
      def parse_options(opt_string)
        pairs, opts = opt_string.split(','), {}
        pairs.each do |pair|
          opt, value = pair.split(':')
          opt, value = opt.strip, value.strip
          opts[opt.to_sym] = value
        end
        return opts
      end
      
      def evaluate(options, context)
        evaluated = {}
        options.each { |opt, value| evaluated[opt] = context[value]  }
        return evaluated
      end
  end
end