module Scrivito
  class ObjsController < WebserviceController
    around_action :require_selected_workspace_write_authorization, only: [
      :copy,
      :create,
      :destroy,
      :destroy_widget,
      :duplicate,
      :mark_resolved,
      :restore,
      :restore_widget,
      :revert,
      :revert_widget,
      :update,
    ]

    before_filter :require_identical_selected_and_visible_workspace, only: [
      :copy,
      :create,
      :duplicate,
      :page_class_selection,
      :update,
      :widget_class_selection,
    ]

    def create
      params_parser = ObjCreateParamsParser.new(request.host, request.port)
      @obj = Obj.create(params_parser.parse(params[:obj]))
      render :obj
    end

    def details
      assert_dialog_layout
      render current_obj.details_view_path, layout: 'scrivito_dialog', formats: :html
    end

    def update
      params_parser = ObjUpdateParamsParser.new(current_obj, request.host, request.port)
      current_obj.update(params_parser.parse(params[:obj]))
    end

    def destroy
      in_selected_workspace { current_obj.destroy }
      render_empty_json
    end

    def destroy_widget
      in_selected_workspace { current_widget.destroy }
      render_empty_json
    end

    def revert
      in_selected_workspace { current_obj.revert }
      render_empty_json
    end

    def revert_widget
      in_selected_workspace { current_widget.revert }
      render_empty_json
    end

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

    def restore_widget
      in_selected_workspace { current_obj.restore_widget(params[:widget_id]) }
      render_empty_json
    end

    def mark_resolved
      in_selected_workspace { current_obj.mark_resolved }
      render_empty_json
    end

    def copy
      @obj = copy_obj(current_obj, params[:parent_path])
      render :obj
    end

    def duplicate
      @obj = copy_obj(current_obj, current_obj.parent_path)
      render :obj
    end

    def page_class_selection
      @page_class_markup = valid_page_classes.map do |page_class_name|
        begin
          markup = render_to_string("#{page_class_name.underscore}/thumbnail", formats: :html)
          {name: page_class_name, markup: markup}
        rescue ActionView::MissingTemplate
        end
      end
      @page_class_markup.compact!
    end

    def widget_class_selection
      load_obj

      @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, formats: :html)
        rescue ActionView::MissingTemplate
          render_to_string('scrivito/widget_thumbnail', layout: false, formats: :html,
              locals: {widget_class_name: widget_class_name, template_path: template_path})
        end
        {name: widget_class_name, markup: markup}
      end
    end

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

        if params[:query_action] == 'size'
          render :search_only_size
        elsif @formatter = fetch_formatter(@query[:format])
          render :search
        else
          render :format_missing_error, status: :not_found
        end
      end
    end

    def modification
      in_selected_workspace { render }
    end

    def widget_modification
      in_selected_workspace { render }
    end

    private

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

    def require_selected_workspace_write_authorization(&block)
      authorize_workspace_access(:write, selected_workspace, &block)
    end

    def in_selected_workspace(&block)
      selected_workspace.as_current(&block)
    end

    def selected_workspace
      editing_context.selected_workspace
    end

    def current_obj
      @obj || load_obj
    end
    helper_method :current_obj

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

    def current_widget
      @widget || load_widget
    end
    helper_method :current_widget

    def load_widget
      raise ScrivitoError, 'no widget_id param specified' if params[:widget_id].blank?
      unless @widget = current_obj.widget_from_pool(params[:widget_id])
        raise ScrivitoError, "widget with ID '#{params[:widget_id]}' not found"
      end
      @widget
    end

    def copy_obj(obj, parent_path)
      id = SecureRandom.hex(8)
      obj.copy(_id: id, _path: parent_path && "#{parent_path}/#{id}")
    end

    def fetch_formatter(name)
      name ? Configuration.obj_formats[name] : proc { |obj, _| obj.id }
    end

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

    def valid_widget_classes
      (widget_classes_from_widget || widget_classes_from_obj || widget_descendants).map(&:to_s)
    end

    def widget_classes_from_widget
      if params[:widget_id] && (widget = current_obj.widget_from_pool(params[:widget_id]))
        widget.valid_widget_classes_for(params[:field_name])
      end
    end

    def widget_classes_from_obj
      current_obj.valid_widget_classes_for(params[:field_name])
    end

    def widget_descendants
      Widget.descendants.reject(&:hide_from_widget_class_selection?)
    end

    def assert_dialog_layout
      view_context.lookup_context.find('layouts/scrivito_dialog')
    rescue ActionView::MissingTemplate
      raise %{
        Missing the Scrivito dialog layout!

        Scrivito requires a special view layout in order to render the details dialog.
        Normally the install generator places it in `app/views/layouts/scrivito_dialog.html.erb`.
        If upgrading Scrivito, please re-run the install generator: `rails g scrivito:install`.
      }
    end
  end
end