Workflow info and update

app/controllers/project_admin/workflows_controller.rb

@@ -2,8 +2,39 @@
 
 module ProjectAdmin
   class WorkflowsController < ApplicationController
+    before_action :fetch_workflow, only: %w[show edit update destroy]
+
     def index
       @workflows = @project.workflows
     end
+
+    def show
+      # TODO: add loading statuses and other things
+    end
+
+    def edit
+      @form = ProjectAdmin::Workflows::Update.new(
+        @workflow.attributes.slice('name', 'icon', 'color')
+      )
+    end
+
+    def update
+      @form = ProjectAdmin::Workflows::Update.new(params.expect(workflow: %i[name color icon]))
+
+      if @form.perform(@workflow)
+        redirect_to project_admin_workflow_path(@project, @workflow)
+      else
+        render :edit, status: :unprocessable_entity
+      end
+    end
+
+    def destroy
+    end
+
+    private
+
+    def fetch_workflow
+      @workflow = @project.workflows.find(params[:id])
+    end
   end
 end