Progress

app/services/purge_chat_messages_service.rb

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+# frozen_string_literal: true
+
+class PurgeChatMessagesService < BaseService
+  def call(account, chat_conversation)
+    unless account.is_pro
+      raise GabSocial::NotPermittedError
+    end
+
+    # Destroy all
+    ChatMessage.where(from_account: account, chat_conversation: chat_conversation).in_batches.destroy_all
+
+    @last_chat_in_conversation = ChatMessage.where(chat_conversation: chat_conversation).first
+
+    @chat_conversation_recipients_accounts = ChatConversationAccount.where(chat_conversation: chat_conversation)
+    @chat_conversation_recipients_accounts.each do |recipient|
+      # make sure last_chat_message_id in chat_account_conversation gets set to last
+      unless @last_chat_in_conversation.nil?
+        recipient.last_chat_message_id = @last_chat_in_conversation.id
+      else
+        recipient.last_chat_message_id = nil
+      end
+
+      # Reset and save
+      recipient.unread_count = 0
+      recipient.save
+    end
+  end
+end