Restructure omni services and add Chatwoot research snapshot

research/chatwoot/app/controllers/api/v1/accounts/inboxes/assignment_policies_controller.rb

@@ -0,0 +1,46 @@
+class Api::V1::Accounts::Inboxes::AssignmentPoliciesController < Api::V1::Accounts::BaseController
+  before_action :fetch_inbox
+  before_action :fetch_assignment_policy, only: [:create]
+  before_action -> { check_authorization(AssignmentPolicy) }
+  before_action :validate_assignment_policy, only: [:show, :destroy]
+
+  def show
+    @assignment_policy = @inbox.assignment_policy
+  end
+
+  def create
+    # There should be only one assignment policy for an inbox.
+    # If there is a new request to add an assignment policy, we will
+    # delete the old one and attach the new policy
+    remove_inbox_assignment_policy
+    @inbox_assignment_policy = @inbox.create_inbox_assignment_policy!(assignment_policy: @assignment_policy)
+    @assignment_policy = @inbox.assignment_policy
+  end
+
+  def destroy
+    remove_inbox_assignment_policy
+    head :ok
+  end
+
+  private
+
+  def remove_inbox_assignment_policy
+    @inbox.inbox_assignment_policy&.destroy
+  end
+
+  def fetch_inbox
+    @inbox = Current.account.inboxes.find(permitted_params[:inbox_id])
+  end
+
+  def fetch_assignment_policy
+    @assignment_policy = Current.account.assignment_policies.find(permitted_params[:assignment_policy_id])
+  end
+
+  def permitted_params
+    params.permit(:assignment_policy_id, :inbox_id)
+  end
+
+  def validate_assignment_policy
+    return render_not_found_error(I18n.t('errors.assignment_policy.not_found')) unless @inbox.assignment_policy
+  end
+end