module PlataformaSocial
  module Helpers
    
    def plataforma_social_javascripts
      plataforma_social_script_tag + plataforma_social_config_script + signed_request_javascript
    end
    
    def plataforma_social_script_tag
      %Q{<script src="#{PlataformaSocial.domains('js')}/socialp.js" type="text/javascript" charset="utf-8"></script>}.html_safe
    end
    
    def plataforma_social_config_script
      %Q{<script type="text/javascript" charset="utf-8">
        $P.init({ apiKey: '#{PlataformaSocial.api_key}' });
        window._FACEBOOK_APP_URL = 'http://apps.facebook.com/#{PlataformaSocial.facebook_app_namespace}';
      </script>}.html_safe
    end
    
    def signed_request_javascript
      default_params = {
        :signed_request => params[:signed_request] || nil,
        :code => params[:code] || nil
      }
      
      %Q{
        <script type="text/javascript" charset="utf-8">
          if($ && jQuery){
            $(function(){      
              $(document).ajaxSend(function(elm, xhr, s){
                var method        = s.type;
                var defaultParams = #{default_params.to_json};
                var params        = {};
                var query         = [];
        
                var data = method == "POST" ? s.data : s.url.split('?')[1];
          
                if(data){
                  var splittedData = data.split('&');
                  for(var i in splittedData){
                    var param = splittedData[i].split('=');
            
                    params[param[0]] = param[1];
                  } // for
                } // if
        
                for(var i in defaultParams){          
                  if(!params[i]) params[i] = defaultParams[i];
                }
              
                for(var i in params){
                  query.push(decodeURIComponent(i) + '=' + decodeURIComponent(params[i]));
                }
                
                query = query.join('&');
              
                if(method == "POST"){
                  s.data = query;
                }
                else {
                  s.url = s.url.split('?')[0] + '?' + query; 
                }
                
                xhr.setRequestHeader("Content-type", s.contentType);
              });
            });          
          }
        </script>
      }.html_safe
    end
    
    def custom_redirect_to path, options = {}
      options.each_pair do |key, value|
        cookies[key] = value
      end
      
      render :text => %Q{
        <script type="text/javascript" charset="utf-8">
          window.top.location = "//apps.facebook.com/#{PlataformaSocial.facebook_app_namespace}#{path}";
        </script>
      }
    end
    
    def from_facebook?
      request && request.referer && request.referer.index('facebook.com')
    end
    
    def from_admin?
      params.present? && params[:controller].present? && params[:controller].index(PlataformaSocial.admin_controller_name) == 0
    end
    
    def link_to *args, &block
      args[2] ||= {}
      
      if args[2][:normal] === true
        super
      else
        unless block_given?
          if from_facebook? && !from_admin?
            server_domain = request.env['HTTP_HOST']
            url           = 'apps.facebook.com/' + PlataformaSocial.facebook_app_namespace 
            
            if args[1].include? server_domain
              args[1].gsub! server_domain, url
            else
              args[1] = request.protocol + url + args[1]
            end
          
            args[2][:target] = '_top'
          else
            super
          end
        end
        
        super
      end
    end
  end
end

ActiveSupport.on_load(:action_view) do
  include PlataformaSocial::Helpers
end

class ActionController::Base
  include PlataformaSocial::Helpers
end