module Scrivito

  class ObjsController < WebserviceController
    before_filter :ensure_identical_selected_and_visible_workspace, only: [:create, :update, :copy,
        :duplicate, :page_class_selection, :create_widget, :widget_class_selection, :copy_widget]

    def create
      created_obj = task_unaware_request(:post,
        "workspaces/#{Workspace.current.id}/objs",
        {obj: obj_params}
      )
      render json: created_obj
    end

    def details
      load_object
      render json: {markup: render_to_string(@obj.details_view_path, layout: false)}
    end

    def update
      load_object
      changed_obj = task_unaware_request(:put,
        "workspaces/#{Workspace.current.id}/objs/#{params[:id]}",
        {obj: obj_params}
      )
      render json: changed_obj
    end

    def destroy
      in_selected_workspace { load_object.destroy }
      render_empty_json
    end

    def revert
      in_selected_workspace { load_object.revert }
      render_empty_json
    end

    def restore
      in_selected_workspace { Obj.restore(params[:id]) }
      render_empty_json
    end

    def mark_resolved
      in_selected_workspace { load_object.mark_resolved }
      render_empty_json
    end

    def copy
      render json: copy_obj(get_obj_attributes(params[:id]), params[:parent_path])
    end

    def duplicate
      attributes = get_obj_attributes(params[:id])

      render json: copy_obj(attributes, parent_path(attributes['_path']))
    end

    def page_class_selection
      valid_page_classes = Obj.valid_page_classes_beneath(params[:parent_path]) ||
          Obj.descendants
      valid_page_classes.map!(&:to_s)

      page_class_names = valid_page_classes.map do |page_class_name|
        begin
          markup = render_to_string("#{page_class_name.underscore}/thumbnail")
          {name: page_class_name, markup: markup}
        rescue ActionView::MissingTemplate
        end
      end

      render json: page_class_names.compact
    end

    def widget_class_selection
      load_object
      valid_widget_classes = @obj.valid_widget_classes_for(params[:field_name]) ||
          Widget.descendants
      valid_widget_classes.map!(&:to_s)

      widgets_classes = valid_widget_classes.map do |widget_class_name|
        template_path = "#{widget_class_name.underscore}/thumbnail"
        markup = begin
          render_to_string(template_path, layout: false)
        rescue ActionView::MissingTemplate
          render_to_string('scrivito/widget_thumbnail', layout: false,
              locals: {widget_class_name: widget_class_name, template_path: template_path})
        end
        {name: widget_class_name, markup: markup}
      end

      render json: widgets_classes
    end

    def search
      in_selected_workspace do
        query = MultiJson.decode(params[:query]).with_indifferent_access
        search_builder = ObjSearchBuilder.new(query)
        enumerator = search_builder.build

        if params[:query_action] == 'size'
          result = { total: enumerator.size }
        else
          batch = enumerator.load_batch

          result = {
            total: enumerator.size,
            hits: batch
          }
        end

        render json: result
      end
    rescue ObjSearchEnumerator::UnregisteredObjFormat => e
      render json: { error: e.message }, status: :not_found
    end

    private

    def load_object
      @obj = Obj.find(params[:id])
    end

    def ensure_identical_selected_and_visible_workspace
      if editing_context.selected_workspace != editing_context.visible_workspace
        raise ScrivitoError, "selected and visible workspace are not identical"
      end
    end

    def obj_params
      @obj_params ||= ObjParamsParser.new(request.host, request.port).parse(@obj, params[:obj])
    end

    def copy_obj(attributes, target_path=nil)
      copied_attributes = attributes.except!('id', '_id', '_permalink')
      copied_attributes['_path'] = "#{target_path}/#{SecureRandom.hex(6)}"

      task_unaware_request(:post, "workspaces/#{Workspace.current.id}/objs", obj: copied_attributes)
    end

    def get_obj_attributes(id)
      task_unaware_request(:get, "workspaces/#{Workspace.current.id}/objs/#{id}")
    end

    def parent_path(path)
      path.split('/')[0..-2].join('/')
    end

    def current_page
      Obj.find(params[:current_page_id]) if params[:current_page_id].present?
    end
    helper_method :current_page

    delegate :task_unaware_request, to: CmsRestApi

    private

    def editing_context
      request.env[EditingContextMiddleware::ENVKEY] || EditingContext.new
    end

    def in_selected_workspace
      editing_context.selected_workspace.as_current do
        yield
      end
    end

    def render_empty_json
      render json: {}
    end
  end

end