module Formol
  module PostsHelper
    def link_to_post_position(post, index)
      idx = ((params[:page] || 1) - 1) * per_page + index + 1
      
      return link_to "##{idx}", "#formol_post_#{post.id}"
    end
    
    def link_to_last_fives_post_position(post, topic, index)
      idx = topic.posts_count - index
      
      return link_to "##{idx}", "#formol_post_#{post.id}"
    end
    
    def display_avatars?(user)
      return true unless user
      
      user.preference.display_avatars?
    end
    
    def display_signatures?(user, post)
      s = post.display_signature? && !post.user.preference.signature.blank?
      
      (s && user ? user.preference.display_signatures? : s)
    end
    
    def avatar_for(user)
      img = if user.respond_to?(:avatar_url) && user.avatar_url.present?
        user.avatar_url
      elsif user.respond_to?(:email) && user.email.present?
        require 'digest/md5' unless defined?(Digest::MD5)
        
        email_h = Digest::MD5.hexdigest(user.email.to_s.strip.downcase)
        options = { :s => 100, :d => default_avatar }
        
        "http://www.gravatar.com/avatar/#{email_h}?#{options.to_param}"
      else
        default_avatar
      end
      
      image_tag(img, :alt => user.display_name)
    end
    
    def default_avatar
      img = Formol.config.default_avatar
      
      img && URI(img).absolute? ? img : request.protocol + request.host_with_port + path_to_image(img)
    end
  end
end