feat: New APIs for search (#6564)

- Adding new API endpoints for search
- Migrations to add appropriate indexes

app/services/search_service.rb

@@ -0,0 +1,43 @@
+class SearchService
+  pattr_initialize [:current_user!, :current_account!, :params!, :search_type!]
+
+  def perform
+    case search_type
+    when 'Message'
+      { messages: filter_messages }
+    when 'Conversation'
+      { conversations: filter_conversations }
+    when 'Contact'
+      { contacts: filter_contacts }
+    else
+      { contacts: filter_contacts, messages: filter_messages, conversations: filter_conversations }
+    end
+  end
+
+  private
+
+  def accessable_inbox_ids
+    @accessable_inbox_ids ||= @current_user.assigned_inboxes.pluck(:id)
+  end
+
+  def filter_conversations
+    @conversations = current_account.conversations.where(inbox_id: accessable_inbox_ids)
+                                    .joins('INNER JOIN contacts ON conversations.contact_id = contacts.id')
+                                    .where("cast(conversations.display_id as text) ILIKE :search OR contacts.name ILIKE :search OR contacts.email
+                            ILIKE :search OR contacts.phone_number ILIKE :search OR contacts.identifier ILIKE :search", search: "%#{params[:q]}%")
+                                    .limit(10)
+  end
+
+  def filter_messages
+    @messages = current_account.messages.where(inbox_id: accessable_inbox_ids)
+                               .where('messages.content ILIKE :search', search: "%#{params[:q]}%")
+                               .where('created_at >= ?', 3.months.ago).limit(10)
+  end
+
+  def filter_contacts
+    @contacts = current_account.contacts.where(
+      "name ILIKE :search OR email ILIKE :search OR phone_number
+      ILIKE :search OR identifier ILIKE :search", search: "%#{params[:q]}%"
+    ).limit(10)
+  end
+end