Restructure omni services and add Chatwoot research snapshot

research/chatwoot/app/models/concerns/assignment_handler.rb

@@ -0,0 +1,55 @@
+module AssignmentHandler
+  extend ActiveSupport::Concern
+  include Events::Types
+
+  included do
+    before_save :ensure_assignee_is_from_team
+    after_commit :notify_assignment_change, :process_assignment_changes
+  end
+
+  private
+
+  def ensure_assignee_is_from_team
+    return unless team_id_changed?
+
+    validate_current_assignee_team
+    self.assignee ||= find_assignee_from_team
+  end
+
+  def validate_current_assignee_team
+    self.assignee_id = nil if team&.members&.exclude?(assignee)
+  end
+
+  def find_assignee_from_team
+    return if team&.allow_auto_assign.blank?
+
+    team_members_with_capacity = inbox.member_ids_with_assignment_capacity & team.members.ids
+    ::AutoAssignment::AgentAssignmentService.new(conversation: self, allowed_agent_ids: team_members_with_capacity).find_assignee
+  end
+
+  def notify_assignment_change
+    {
+      ASSIGNEE_CHANGED => -> { saved_change_to_assignee_id? },
+      TEAM_CHANGED => -> { saved_change_to_team_id? }
+    }.each do |event, condition|
+      condition.call && dispatcher_dispatch(event, previous_changes)
+    end
+  end
+
+  def process_assignment_changes
+    process_assignment_activities
+  end
+
+  def process_assignment_activities
+    user_name = Current.user.name if Current.user.present?
+    if saved_change_to_team_id?
+      create_team_change_activity(user_name)
+    elsif saved_change_to_assignee_id?
+      create_assignee_change_activity(user_name)
+    end
+  end
+
+  def self_assign?(assignee_id)
+    assignee_id.present? && Current.user&.id == assignee_id
+  end
+end