module ActiveScaffold::Actions
  module List
    def self.included(base)
      base.before_filter :list_authorized_filter, :only => [:index, :row]
      base.helper_method :list_columns
    end

    def index
      list
    end

    # get just a single row
    def row
      get_row
      respond_to_action(:row)
    end

    def list
      if %w(index list).include? action_name
        do_list
      else
        do_refresh_list
      end
      @nested_auto_open = active_scaffold_config.list.nested_auto_open
      respond_to_action(:list)
    end
    
    protected
    def list_respond_to_html
      if embedded?
        render :action => 'list', :layout => false
      else
        render :action => 'list'
      end
    end
    def list_respond_to_js
      if params[:adapter] || embedded?
        render(:partial => 'list_with_header')
      else
        render :partial => 'refresh_list', :formats => [:js]
      end
    end
    def list_respond_to_xml
      render :xml => response_object.to_xml(:only => list_columns_names), :content_type => Mime::XML, :status => response_status
    end
    def list_respond_to_json
      render :text => response_object.to_json(:only => list_columns_names), :content_type => Mime::JSON, :status => response_status
    end
    def list_respond_to_yaml
      render :text => Hash.from_xml(response_object.to_xml(:only => list_columns_names)).to_yaml, :content_type => Mime::YAML, :status => response_status
    end
    
    def row_respond_to_html
      render(:partial => 'row', :locals => {:record => @record})
    end
    
    def row_respond_to_js
      render :action => 'row'
    end

    # The actual algorithm to prepare for the list view
    def set_includes_for_columns(action = :list)
      @cache_associations = true
      includes_for_list_columns = active_scaffold_config.send(action).columns.collect{ |c| c.includes }.flatten.uniq.compact
      self.active_scaffold_includes.concat includes_for_list_columns
    end
    
    def get_row
      set_includes_for_columns
      klass = beginning_of_chain.includes(active_scaffold_includes)
      @record = find_if_allowed(params[:id], :read, klass)
    end

    # The actual algorithm to prepare for the list view
    def do_list
      set_includes_for_columns

      options = { :sorting => active_scaffold_config.list.user.sorting,
        :count_includes => active_scaffold_config.list.user.count_includes }
      paginate = (params[:format].nil?) ? (accepts? :html, :js) : ['html', 'js'].include?(params[:format])
      if paginate
        options.merge!({
            :per_page => active_scaffold_config.list.user.per_page,
            :page => active_scaffold_config.list.user.page,
            :pagination => active_scaffold_config.list.pagination
          })
      end
      if active_scaffold_config.list.auto_select_columns
        options[:select] = active_scaffold_config.list.columns.map(&:select_columns).compact.flatten + active_scaffold_config.columns[active_scaffold_config.model.primary_key].select_columns
      end

      page = find_page(options)
      total_pages = page.pager.number_of_pages
      if !page.pager.infinite? && !total_pages.zero? && page.number > total_pages
        page = page.pager.last
        active_scaffold_config.list.user.page = page.number
      end
      @page, @records = page, page.items
    end
    
    def do_refresh_list
      params.delete(:id)
      do_search if respond_to? :do_search
      do_list
    end

    def each_record_in_page
      _page = active_scaffold_config.list.user.page
      do_search if respond_to? :do_search
      active_scaffold_config.list.user.page = _page
      do_list
      @page.items.each {|record| yield record}
    end

    def each_record_in_scope
      do_search if respond_to? :do_search
      append_to_query(beginning_of_chain, finder_options).all.each {|record| yield record}
    end

    # The default security delegates to ActiveRecordPermissions.
    # You may override the method to customize.
    def list_authorized?
      authorized_for?(:crud_type => :read)
    end

    # call this method in your action_link action to simplify processing of actions
    # eg for member action_link :fire
    # process_action_link_action do |record|
    #   record.update_attributes(:fired => true)
    #   self.successful = true
    #   flash[:info] = 'Player fired'
    # end
    def process_action_link_action(render_action = :action_update, crud_type = nil)
      if request.get?
        # someone has disabled javascript, we have to show confirmation form first
        @record = find_if_allowed(params[:id], :read) if params[:id] && params[:id] && params[:id].to_i > 0
        respond_to_action(:action_confirmation)
      else
        @action_link = active_scaffold_config.action_links[action_name]
        if params[:id] && params[:id] && params[:id].to_i > 0
          crud_type ||= (request.post? || request.put?) ? :update : :delete
          set_includes_for_columns
          klass = beginning_of_chain.includes(active_scaffold_includes)
          @record = find_if_allowed(params[:id], crud_type, klass)
          unless @record.nil?
            yield @record
          else
            self.successful = false
            flash[:error] = as_(:no_authorization_for_action, :action => action_name)
          end
        else
          yield
        end
        respond_to_action(render_action)
      end
    end

    def action_confirmation_respond_to_html(confirm_action = action_name.to_sym)
      link = active_scaffold_config.action_links[confirm_action]
      render :action => 'action_confirmation', :locals => {:record => @record, :link => link}
    end

    def action_update_respond_to_html
      redirect_to :action => 'index'
    end

    def action_update_respond_to_js
      do_refresh_list unless @record.present?
      render(:action => 'on_action_update')
    end

    def action_update_respond_to_xml
      render :xml => successful? ? "" : response_object.to_xml(:only => list_columns_names), :content_type => Mime::XML, :status => response_status
    end

    def action_update_respond_to_json
      render :text => successful? ? "" : response_object.to_json(:only => list_columns_names), :content_type => Mime::JSON, :status => response_status
    end

    def action_update_respond_to_yaml
      render :text => successful? ? "" : Hash.from_xml(response_object.to_xml(:only => list_columns_names)).to_yaml, :content_type => Mime::YAML, :status => response_status
    end
     
    private
    def list_authorized_filter
      raise ActiveScaffold::ActionNotAllowed unless list_authorized?
    end

    def list_formats
      (default_formats + active_scaffold_config.formats + active_scaffold_config.list.formats).uniq
    end
    alias_method :index_formats, :list_formats

    def row_formats
      ([:html, :js] + active_scaffold_config.formats + active_scaffold_config.list.formats).uniq
    end

    def action_update_formats
      (default_formats + active_scaffold_config.formats).uniq
    end

    def action_confirmation_formats
      (default_formats + active_scaffold_config.formats).uniq
    end

    def list_columns
      active_scaffold_config.list.columns.collect_visible
    end

    def list_columns_names
      list_columns.collect(&:name)
    end
  end
end