discourse/spec/models/post_mover_spec.rb

# frozen_string_literal: true

require 'rails_helper'

describe PostMover do
  fab!(:admin) { Fabricate(:admin) }
  fab!(:evil_trout) { Fabricate(:evil_trout) }

  describe '#move_types' do
    context "verify enum sequence" do
      before do
        @move_types = PostMover.move_types
      end

      it "'new_topic' should be at 1st position" do
        expect(@move_types[:new_topic]).to eq(1)
      end

      it "'existing_topic' should be at 2nd position" do
        expect(@move_types[:existing_topic]).to eq(2)
      end
    end
  end

  describe 'move_posts' do
    context 'topics' do
      fab!(:user) { Fabricate(:user, admin: true) }
      fab!(:another_user) { evil_trout }
      fab!(:category) { Fabricate(:category, user: user) }
      fab!(:topic) { Fabricate(:topic, user: user) }
      fab!(:p1) { Fabricate(:post, topic: topic, user: user, created_at: 3.hours.ago, reply_count: 2) }

      fab!(:p2) do
        Fabricate(
          :post,
          topic: topic,
          user: another_user,
          raw: "Has a link to [evil trout](http://eviltrout.com) which is a cool site.",
          reply_to_post_number: p1.post_number,
          reply_count: 1
        )
      end

      fab!(:p3) { Fabricate(:post, topic: topic, reply_to_post_number: p1.post_number, user: user) }
      fab!(:p4) { Fabricate(:post, topic: topic, reply_to_post_number: p2.post_number, user: user) }
      fab!(:p5) { Fabricate(:post) }
      let(:p6) { Fabricate(:post, topic: topic) }

      before do
        SiteSetting.tagging_enabled = true
        Jobs.run_immediately!
        p1.replies.push(p2, p3)
        p2.replies.push(p4)
        UserActionManager.enable
        @like = PostActionCreator.like(another_user, p4)
      end

      context 'success' do

        it "correctly handles notifications and bread crumbs" do
          old_topic = p2.topic

          old_topic_id = p2.topic_id

          topic.move_posts(user, [p2.id, p4.id, p6.id], title: "new testing topic name")

          p2.reload
          expect(p2.topic_id).not_to eq(old_topic_id)
          expect(p2.reply_to_post_number).to eq(nil)
          expect(p2.reply_to_user_id).to eq(nil)

          notification = p2.user.notifications.where(notification_type: Notification.types[:moved_post]).first

          expect(notification.topic_id).to eq(p2.topic_id)
          expect(notification.post_number).to eq(1)

          # no message for person who made the move
          expect(p4.user.notifications.where(notification_type: Notification.types[:moved_post]).length).to eq(0)

          # notify at the right spot in the stream
          notification = p6.user.notifications.where(notification_type: Notification.types[:moved_post]).first

          expect(notification.topic_id).to eq(p2.topic_id)

          # this is the 3rd post we moved
          expect(notification.post_number).to eq(3)

          old_topic.reload
          move_message = old_topic.posts.find_by(post_number: 2)
          expect(move_message.post_type).to eq(Post.types[:small_action])
          expect(move_message.raw).to include("3 posts were split")
        end
      end

      context "errors" do

        it "raises an error when one of the posts doesn't exist" do
          non_existent_post_id = Post.maximum(:id)&.next || 1
          expect { topic.move_posts(user, [non_existent_post_id], title: "new testing topic name") }.to raise_error(Discourse::InvalidParameters)
        end

        it "raises an error and does not create a topic if no posts were moved" do
          Topic.count.tap do |original_topic_count|
            expect {
              topic.move_posts(user, [], title: "new testing topic name")
            }.to raise_error(Discourse::InvalidParameters)

            expect(Topic.count).to eq original_topic_count
          end
        end
      end

      context "successfully moved" do
        before do
          TopicUser.update_last_read(user, topic.id, p4.post_number, p4.post_number, 0)
          TopicLink.extract_from(p2)
        end

        context "post replies" do
          describe "when a post with replies is moved" do
            it "should update post replies correctly" do
              topic.move_posts(
                user,
                [p2.id],
                title: 'GOT is a very addictive show', category_id: category.id
              )

              expect(p2.reload.replies).to eq([])
            end

            it "doesn't raise errors with deleted replies" do
              p4.trash!
              topic.move_posts(
                user,
                [p2.id],
                title: 'GOT is a very addictive show', category_id: category.id
              )

              expect(p2.reload.replies).to eq([])
            end
          end

          describe "when replies of a post have been moved" do
            it "should update post replies correctly" do
              p5 = Fabricate(
                :post,
                topic: topic,
                reply_to_post_number: p2.post_number,
                user: another_user
              )

              p2.replies << p5

              topic.move_posts(
                user,
                [p4.id],
                title: 'GOT is a very addictive show', category_id: category.id
              )

              expect(p2.reload.replies).to eq([p5])
            end
          end

          describe "when only one reply is left behind" do
            it "should update post replies correctly" do
              p5 = Fabricate(
                :post,
                topic: topic,
                reply_to_post_number: p2.post_number,
                user: another_user
              )

              p2.replies << p5

              topic.move_posts(
                user,
                [p2.id, p4.id],
                title: 'GOT is a very addictive show', category_id: category.id
              )

              expect(p2.reload.replies).to eq([p4])
            end
          end
        end

        context "to a new topic" do

          it "works correctly" do
            topic.expects(:add_moderator_post).once
            new_topic = topic.move_posts(user, [p2.id, p4.id], title: "new testing topic name", category_id: category.id, tags: ["tag1", "tag2"])

            expect(TopicUser.find_by(user_id: user.id, topic_id: topic.id).last_read_post_number).to eq(p3.post_number)

            expect(new_topic).to be_present
            expect(new_topic.featured_user1_id).to eq(p4.user_id)
            expect(new_topic.like_count).to eq(1)

            expect(new_topic.category).to eq(category)
            expect(new_topic.tags.pluck(:name)).to contain_exactly("tag1", "tag2")
            expect(topic.featured_user1_id).to be_blank
            expect(new_topic.posts.by_post_number).to match_array([p2, p4])

            new_topic.reload
            expect(new_topic.posts_count).to eq(2)
            expect(new_topic.highest_post_number).to eq(2)

            p4.reload
            expect(new_topic.last_post_user_id).to eq(p4.user_id)
            expect(new_topic.last_posted_at).to eq(p4.created_at)
            expect(new_topic.bumped_at).to eq(p4.created_at)

            p2.reload
            expect(p2.sort_order).to eq(1)
            expect(p2.post_number).to eq(1)
            expect(p2.topic_links.first.topic_id).to eq(new_topic.id)

            expect(p4.post_number).to eq(2)
            expect(p4.sort_order).to eq(2)

            topic.reload
            expect(topic.featured_user1_id).to be_blank
            expect(topic.like_count).to eq(0)
            expect(topic.posts_count).to eq(2)
            expect(topic.posts.by_post_number).to match_array([p1, p3])
            expect(topic.highest_post_number).to eq(p3.post_number)

            # both the like and was_liked user actions should be correct
            action = UserAction.find_by(user_id: another_user.id)
            expect(action.target_topic_id).to eq(new_topic.id)

            expect(TopicUser.exists?(
              user_id: another_user,
              topic_id: new_topic.id,
              notification_level: TopicUser.notification_levels[:watching],
              notifications_reason_id: TopicUser.notification_reasons[:created_topic]
            )).to eq(true)
            expect(TopicUser.exists?(user_id: user, topic_id: new_topic.id)).to eq(false)
          end

          it "moving all posts will close the topic" do
            topic.expects(:add_moderator_post).twice
            new_topic = topic.move_posts(user, [p1.id, p2.id, p3.id, p4.id], title: "new testing topic name", category_id: category.id)
            expect(new_topic).to be_present

            topic.reload
            expect(topic.closed).to eq(true)
          end

          it 'does not move posts that do not belong to the existing topic' do
            new_topic = topic.move_posts(
              user, [p2.id, p3.id, p5.id], title: 'Logan is a pretty good movie'
            )

            expect(new_topic.posts.pluck(:id).sort).to eq([p2.id, p3.id].sort)
          end

          it "uses default locale for moderator post" do
            I18n.locale = 'de'

            new_topic = topic.move_posts(user, [p2.id, p4.id], title: "new testing topic name", category_id: category.id)
            post = Post.find_by(topic_id: topic.id, post_type: Post.types[:small_action])

            expected_text = I18n.with_locale(:en) do
              I18n.t("move_posts.new_topic_moderator_post",
                     count: 2,
                     topic_link: "[#{new_topic.title}](#{new_topic.relative_url})")
            end

            expect(post.raw).to eq(expected_text)
          end

          it "does not try to move small action posts" do
            small_action = Fabricate(:post, topic: topic, raw: "A small action", post_type: Post.types[:small_action])
            hidden_small_action = Fabricate(:post, topic: topic, post_type: Post.types[:whisper])
            hidden_small_action.update_attribute(:raw, "")
            new_topic = topic.move_posts(user, [p2.id, p4.id, small_action.id, hidden_small_action.id], title: "new testing topic name", category_id: category.id)

            expect(new_topic.posts_count).to eq(2)
            expect(small_action.topic_id).to eq(topic.id)
            expect(hidden_small_action.topic_id).to eq(topic.id)

            moderator_post = topic.posts.last
            expect(moderator_post.raw).to include("2 posts were split")
          end

          it "forces resulting topic owner to watch the new topic" do
            new_topic = topic.move_posts(user, [p2.id, p4.id], title: "new testing topic name", category_id: category.id)

            expect(new_topic.posts_count).to eq(2)

            expect(TopicUser.exists?(
              user_id: another_user,
              topic_id: new_topic.id,
              notification_level: TopicUser.notification_levels[:watching],
              notifications_reason_id: TopicUser.notification_reasons[:created_topic]
            )).to eq(true)
          end

          it "updates existing notifications" do
            n3 = Fabricate(:mentioned_notification, post: p3, user: another_user)
            n4 = Fabricate(:mentioned_notification, post: p4, user: another_user)

            new_topic = topic.move_posts(user, [p3.id], title: "new testing topic name")

            n3.reload
            expect(n3.topic_id).to eq(new_topic.id)
            expect(n3.post_number).to eq(1)
            expect(n3.data_hash[:topic_title]).to eq(new_topic.title)

            n4.reload
            expect(n4.topic_id).to eq(topic.id)
            expect(n4.post_number).to eq(4)
          end

          it "deletes notifications for users not allowed to see the topic" do
            another_admin = Fabricate(:admin)
            staff_category = Fabricate(:private_category, group: Group[:staff])
            user_notification = Fabricate(:mentioned_notification, post: p3, user: another_user)
            admin_notification = Fabricate(:mentioned_notification, post: p3, user: another_admin)

            topic.move_posts(user, [p3.id], title: "new testing topic name", category_id: staff_category.id)

            expect(Notification.exists?(user_notification.id)).to eq(false)
            expect(Notification.exists?(admin_notification.id)).to eq(true)
          end
        end

        context "to an existing topic" do
          fab!(:destination_topic) { Fabricate(:topic, user: another_user) }
          fab!(:destination_op) { Fabricate(:post, topic: destination_topic, user: another_user) }

          it "works correctly" do
            topic.expects(:add_moderator_post).once
            moved_to = topic.move_posts(user, [p2.id, p4.id], destination_topic_id: destination_topic.id)
            expect(moved_to).to eq(destination_topic)

            # Check out new topic
            moved_to.reload
            expect(moved_to.posts_count).to eq(3)
            expect(moved_to.highest_post_number).to eq(3)
            expect(moved_to.user_id).to eq(destination_op.user_id)
            expect(moved_to.like_count).to eq(1)
            expect(moved_to.category_id).to eq(SiteSetting.uncategorized_category_id)
            p4.reload
            expect(moved_to.last_post_user_id).to eq(p4.user_id)
            expect(moved_to.last_posted_at).to eq(p4.created_at)
            expect(moved_to.bumped_at).to eq(p4.created_at)

            # Posts should be re-ordered
            p2.reload
            expect(p2.sort_order).to eq(2)
            expect(p2.post_number).to eq(2)
            expect(p2.topic_id).to eq(moved_to.id)
            expect(p2.reply_count).to eq(1)
            expect(p2.reply_to_post_number).to eq(nil)

            expect(p4.post_number).to eq(3)
            expect(p4.sort_order).to eq(3)
            expect(p4.topic_id).to eq(moved_to.id)
            expect(p4.reply_count).to eq(0)
            expect(p4.reply_to_post_number).to eq(2)

            # Check out the original topic
            topic.reload
            expect(topic.posts_count).to eq(2)
            expect(topic.highest_post_number).to eq(3)
            expect(topic.featured_user1_id).to be_blank
            expect(topic.like_count).to eq(0)
            expect(topic.posts_count).to eq(2)
            expect(topic.posts.by_post_number).to match_array([p1, p3])
            expect(topic.highest_post_number).to eq(p3.post_number)

            # Should notify correctly
            notification = p2.user.notifications.where(notification_type: Notification.types[:moved_post]).first

            expect(notification.topic_id).to eq(p2.topic_id)
            expect(notification.post_number).to eq(p2.post_number)

            # Should update last reads
            expect(TopicUser.find_by(user_id: user.id, topic_id: topic.id).last_read_post_number).to eq(p3.post_number)
          end

          it "moving all posts will close the topic" do
            topic.expects(:add_moderator_post).twice
            moved_to = topic.move_posts(user, [p1.id, p2.id, p3.id, p4.id], destination_topic_id: destination_topic.id)
            expect(moved_to).to be_present

            topic.reload
            expect(topic.closed).to eq(true)
          end

          it "does not try to move small action posts" do
            small_action = Fabricate(:post, topic: topic, raw: "A small action", post_type: Post.types[:small_action])
            moved_to = topic.move_posts(user, [p1.id, p2.id, p3.id, p4.id, small_action.id], destination_topic_id: destination_topic.id)

            moved_to.reload
            expect(moved_to.posts_count).to eq(5)
            expect(small_action.topic_id).to eq(topic.id)

            moderator_post = topic.posts.find_by(post_number: 2)
            expect(moderator_post.raw).to include("4 posts were merged")
          end

          it "updates existing notifications" do
            n3 = Fabricate(:mentioned_notification, post: p3, user: another_user)
            n4 = Fabricate(:mentioned_notification, post: p4, user: another_user)

            moved_to = topic.move_posts(user, [p3.id], destination_topic_id: destination_topic.id)

            n3.reload
            expect(n3.topic_id).to eq(moved_to.id)
            expect(n3.post_number).to eq(2)
            expect(n3.data_hash[:topic_title]).to eq(moved_to.title)

            n4.reload
            expect(n4.topic_id).to eq(topic.id)
            expect(n4.post_number).to eq(4)
          end

          it "deletes notifications for users not allowed to see the topic" do
            another_admin = Fabricate(:admin)
            staff_category = Fabricate(:private_category, group: Group[:staff])
            user_notification = Fabricate(:mentioned_notification, post: p3, user: another_user)
            admin_notification = Fabricate(:mentioned_notification, post: p3, user: another_admin)

            destination_topic.update!(category_id: staff_category.id)
            topic.move_posts(user, [p3.id], destination_topic_id: destination_topic.id)

            expect(Notification.exists?(user_notification.id)).to eq(false)
            expect(Notification.exists?(admin_notification.id)).to eq(true)
          end
        end

        context "to a message" do

          it "works correctly" do
            topic.expects(:add_moderator_post).once
            new_topic = topic.move_posts(user, [p2.id, p4.id], title: "new testing topic name", archetype: "private_message")

            expect(TopicUser.find_by(user_id: user.id, topic_id: topic.id).last_read_post_number).to eq(p3.post_number)

            expect(new_topic).to be_present
            expect(new_topic.featured_user1_id).to eq(p4.user_id)
            expect(new_topic.like_count).to eq(1)

            expect(new_topic.archetype).to eq(Archetype.private_message)
            expect(topic.featured_user1_id).to be_blank
            expect(new_topic.posts.by_post_number).to match_array([p2, p4])

            new_topic.reload
            expect(new_topic.posts_count).to eq(2)
            expect(new_topic.highest_post_number).to eq(2)

            p4.reload
            expect(new_topic.last_post_user_id).to eq(p4.user_id)
            expect(new_topic.last_posted_at).to eq(p4.created_at)
            expect(new_topic.bumped_at).to eq(p4.created_at)

            p2.reload
            expect(p2.sort_order).to eq(1)
            expect(p2.post_number).to eq(1)
            expect(p2.topic_links.first.topic_id).to eq(new_topic.id)

            expect(p4.post_number).to eq(2)
            expect(p4.sort_order).to eq(2)

            topic.reload
            expect(topic.featured_user1_id).to be_blank
            expect(topic.like_count).to eq(0)
            expect(topic.posts_count).to eq(2)
            expect(topic.posts.by_post_number).to match_array([p1, p3])
            expect(topic.highest_post_number).to eq(p3.post_number)

            # both the like and was_liked user actions should be correct
            action = UserAction.find_by(user_id: another_user.id)
            expect(action.target_topic_id).to eq(new_topic.id)

            expect(TopicUser.exists?(
              user_id: another_user,
              topic_id: new_topic.id,
              notification_level: TopicUser.notification_levels[:watching],
              notifications_reason_id: TopicUser.notification_reasons[:created_topic]
            )).to eq(true)
            expect(TopicUser.exists?(
              user_id: user,
              topic_id: new_topic.id,
              notification_level: TopicUser.notification_levels[:watching],
              notifications_reason_id: TopicUser.notification_reasons[:created_post]
            )).to eq(true)
          end

        end

        shared_examples "moves email related stuff" do
          it "moves incoming email" do
            Fabricate(:incoming_email, user: old_post.user, topic: old_post.topic, post: old_post)

            new_topic = topic.move_posts(user, [old_post.id], title: "new testing topic name")
            new_post = new_topic.first_post
            email = new_post.incoming_email

            expect(email).to be_present
            expect(email.topic_id).to eq(new_topic.id)
            expect(email.post_id).to eq(new_post.id)

            expect(old_post.reload.incoming_email).to_not be_present unless old_post.id == new_post.id
          end

          it "moves email log entries" do
            old_topic = old_post.topic

            2.times do
              Fabricate(:email_log,
                user: old_post.user,
                post: old_post,
                email_type: :mailing_list
              )
            end

            some_post = Fabricate(:post)

            Fabricate(:email_log,
              user: some_post.user,
              post: some_post,
              email_type: :mailing_list
            )

            expect(EmailLog.where(post_id: old_post.id).count).to eq(2)

            new_topic = old_topic.move_posts(
              user,
              [old_post.id],
              title: "new testing topic name"
            )

            new_post = new_topic.first_post

            expect(EmailLog.where(post_id: new_post.id).count).to eq(2)
          end

          it "preserves post attributes" do
            old_post.update_columns(cook_method: Post.cook_methods[:email], via_email: true, raw_email: "raw email content")

            new_topic = old_post.topic.move_posts(user, [old_post.id], title: "new testing topic name")
            new_post = new_topic.first_post

            expect(new_post.cook_method).to eq(Post.cook_methods[:email])
            expect(new_post.via_email).to eq(true)
            expect(new_post.raw_email).to eq("raw email content")
          end
        end

        context "moving the first post" do

          it "copies the OP, doesn't delete it" do
            topic.expects(:add_moderator_post).once
            new_topic = topic.move_posts(user, [p1.id, p2.id], title: "new testing topic name")

            expect(new_topic).to be_present
            expect(new_topic.posts.by_post_number.first.raw).to eq(p1.raw)
            expect(new_topic.posts_count).to eq(2)
            expect(new_topic.highest_post_number).to eq(2)

            # First post didn't move
            p1.reload
            expect(p1.sort_order).to eq(1)
            expect(p1.post_number).to eq(1)
            expect(p1.topic_id).to eq(topic.id)
            expect(p1.reply_count).to eq(1)

            # New first post
            new_first = new_topic.posts.where(post_number: 1).first
            expect(new_first.reply_count).to eq(1)
            expect(new_first.created_at).to be_within(1.second).of(p1.created_at)

            # Second post is in a new topic
            p2.reload
            expect(p2.post_number).to eq(2)
            expect(p2.sort_order).to eq(2)
            expect(p2.topic_id).to eq(new_topic.id)
            expect(p2.reply_to_post_number).to eq(1)
            expect(p2.reply_count).to eq(0)

            topic.reload
            expect(topic.posts.by_post_number).to match_array([p1, p3, p4])
            expect(topic.highest_post_number).to eq(p4.post_number)

            # updates replies for posts moved to same topic
            expect(PostReply.where(reply_id: p2.id).pluck(:post_id)).to contain_exactly(new_first.id)

            # leaves replies to the first post of the original topic unchanged
            expect(PostReply.where(reply_id: p3.id).pluck(:post_id)).to contain_exactly(p1.id)
          end

          it "preserves post actions in the new post" do
            PostActionCreator.like(another_user, p1)

            new_topic = topic.move_posts(user, [p1.id], title: "new testing topic name")
            new_post = new_topic.posts.where(post_number: 1).first

            expect(new_topic.like_count).to eq(1)
            expect(new_post.like_count).to eq(1)
            expect(new_post.post_actions.size).to eq(1)
          end

          it "preserves the custom_fields in the new post" do
            custom_fields = { "some_field" => 'payload' }
            p1.custom_fields = custom_fields
            p1.save_custom_fields

            new_topic = topic.move_posts(user, [p1.id], title: "new testing topic name")

            expect(new_topic.first_post.custom_fields).to eq(custom_fields)
          end

          include_examples "moves email related stuff" do
            let!(:old_post) { p1 }
          end
        end

        context "moving replies" do
          include_examples "moves email related stuff" do
            let!(:old_post) { p3 }
          end
        end

        context "to an existing topic with a deleted post" do

          before do
            topic.expects(:add_moderator_post)
          end

          fab!(:destination_topic) { Fabricate(:topic, user: user) }
          fab!(:destination_op) { Fabricate(:post, topic: destination_topic, user: user) }
          fab!(:destination_deleted_reply) { Fabricate(:post, topic: destination_topic, user: another_user) }
          let(:moved_to) { topic.move_posts(user, [p2.id, p4.id], destination_topic_id: destination_topic.id) }

          it "works correctly" do
            destination_deleted_reply.trash!

            expect(moved_to).to eq(destination_topic)

            # Check out new topic
            moved_to.reload
            expect(moved_to.posts_count).to eq(3)
            expect(moved_to.highest_post_number).to eq(4)

            # Posts should be re-ordered
            p2.reload
            expect(p2.sort_order).to eq(3)
            expect(p2.post_number).to eq(3)
            expect(p2.topic_id).to eq(moved_to.id)
            expect(p2.reply_count).to eq(1)
            expect(p2.reply_to_post_number).to eq(nil)

            p4.reload
            expect(p4.post_number).to eq(4)
            expect(p4.sort_order).to eq(4)
            expect(p4.topic_id).to eq(moved_to.id)
            expect(p4.reply_to_post_number).to eq(p2.post_number)
          end
        end

        context "to an existing closed topic" do
          fab!(:destination_topic) { Fabricate(:topic, closed: true) }

          it "works correctly for admin" do
            moved_to = topic.move_posts(admin, [p1.id, p2.id], destination_topic_id: destination_topic.id)
            expect(moved_to).to be_present

            moved_to.reload
            expect(moved_to.posts_count).to eq(2)
            expect(moved_to.highest_post_number).to eq(2)
          end
        end

        it "skips validations when moving posts" do
          p1.update_attribute(:raw, "foo")
          p2.update_attribute(:raw, "bar")

          new_topic = topic.move_posts(user, [p1.id, p2.id], title: "new testing topic name")

          expect(new_topic).to be_present
          expect(new_topic.posts.by_post_number.first.raw).to eq(p1.raw)
          expect(new_topic.posts.by_post_number.last.raw).to eq(p2.raw)
          expect(new_topic.posts_count).to eq(2)
        end

        it "corrects reply_counts within original topic" do
          expect do
            topic.move_posts(user, [p4.id], title: "new testing topic name 1")
          end.to change { PostReply.count }.by(-1)
          expect(p1.reload.reply_count).to eq(2)
          expect(p2.reload.reply_count).to eq(0)

          expect do
            topic.move_posts(user, [p2.id, p3.id], title: "new testing topic name 2")
          end.to change { PostReply.count }.by(-2)
          expect(p1.reload.reply_count).to eq(0)
        end
      end
    end

    context 'messages' do
      fab!(:user) { Fabricate(:user) }
      fab!(:another_user) { Fabricate(:user) }
      fab!(:regular_user) { Fabricate(:trust_level_4) }
      fab!(:topic) { Fabricate(:topic) }
      fab!(:personal_message) { Fabricate(:private_message_topic, user: evil_trout) }
      fab!(:p1) { Fabricate(:post, topic: personal_message, user: user) }
      fab!(:p2) { Fabricate(:post, topic: personal_message, reply_to_post_number: p1.post_number, user: another_user) }
      fab!(:p3) { Fabricate(:post, topic: personal_message, reply_to_post_number: p1.post_number, user: user) }
      fab!(:p4) { Fabricate(:post, topic: personal_message, reply_to_post_number: p2.post_number, user: user) }
      fab!(:p5) { Fabricate(:post, topic: personal_message, user: evil_trout) }
      let(:another_personal_message) do
        Fabricate(:private_message_topic, user: user, topic_allowed_users: [
          Fabricate.build(:topic_allowed_user, user: admin)
        ])
      end
      let!(:p6) { Fabricate(:post, topic: another_personal_message, user: evil_trout) }

      before do
        SiteSetting.tagging_enabled = true
        Jobs.run_immediately!
        p1.replies << p3
        p2.replies << p4
        UserActionManager.enable
        @like = PostActionCreator.like(another_user, p4)
      end

      context 'move to new message' do
        it "adds post users as topic allowed users" do
          TopicUser.change(user, personal_message, notification_level: TopicUser.notification_levels[:muted])
          TopicUser.change(another_user, personal_message, notification_level: TopicUser.notification_levels[:tracking])

          personal_message.move_posts(admin, [p2.id, p3.id, p4.id, p5.id], title: "new testing message name", tags: ["tag1", "tag2"], archetype: "private_message")

          p2.reload
          destination_topic = p2.topic
          expect(destination_topic.archetype).to eq(Archetype.private_message)
          expect(destination_topic.topic_allowed_users.where(user_id: user.id).count).to eq(1)
          expect(destination_topic.topic_allowed_users.where(user_id: another_user.id).count).to eq(1)
          expect(destination_topic.topic_allowed_users.where(user_id: evil_trout.id).count).to eq(1)
          expect(destination_topic.tags.pluck(:name)).to eq([])
          expect(TopicUser.exists?(
            user_id: another_user,
            topic_id: destination_topic.id,
            notification_level: TopicUser.notification_levels[:tracking],
            notifications_reason_id: TopicUser.notification_reasons[:created_topic]
          )).to eq(true)
          expect(TopicUser.exists?(
            user_id: user,
            topic_id: destination_topic.id,
            notification_level: TopicUser.notification_levels[:muted],
            notifications_reason_id: TopicUser.notification_reasons[:created_post]
          )).to eq(true)
        end

        it "can add tags to new message when allow_staff_to_tag_pms is enabled" do
          SiteSetting.allow_staff_to_tag_pms = true
          personal_message.move_posts(admin, [p2.id, p5.id], title: "new testing message name", tags: ["tag1", "tag2"], archetype: "private_message")

          p2.reload
          expect(p2.topic.tags.pluck(:name)).to contain_exactly("tag1", "tag2")
        end

        it "correctly handles notifications" do
          old_message = p2.topic
          old_message_id = p2.topic_id

          personal_message.move_posts(admin, [p2.id, p4.id], title: "new testing message name", archetype: "private_message")

          p2.reload
          expect(p2.topic_id).not_to eq(old_message_id)
          expect(p2.reply_to_post_number).to eq(nil)
          expect(p2.reply_to_user_id).to eq(nil)

          notification = p2.user.notifications.where(notification_type: Notification.types[:moved_post]).first

          expect(notification.topic_id).to eq(p2.topic_id)
          expect(notification.post_number).to eq(1)

          # no message for person who made the move
          expect(admin.notifications.where(notification_type: Notification.types[:moved_post]).length).to eq(0)

          old_message.reload
          move_message = old_message.posts.find_by(post_number: 2)
          expect(move_message.post_type).to eq(Post.types[:whisper])
          expect(move_message.raw).to include("2 posts were split")
        end
      end

      context 'move to existing message' do
        it "adds post users as topic allowed users" do
          personal_message.move_posts(admin, [p2.id, p5.id], destination_topic_id: another_personal_message.id, archetype: "private_message")

          p2.reload
          expect(p2.topic_id).to eq(another_personal_message.id)

          another_personal_message.reload
          expect(another_personal_message.topic_allowed_users.where(user_id: another_user.id).count).to eq(1)
          expect(another_personal_message.topic_allowed_users.where(user_id: evil_trout.id).count).to eq(1)
        end

        it "can add additional participants" do
          personal_message.move_posts(admin, [p2.id, p5.id], destination_topic_id: another_personal_message.id, participants: [regular_user.username], archetype: "private_message")

          another_personal_message.reload
          expect(another_personal_message.topic_allowed_users.where(user_id: another_user.id).count).to eq(1)
          expect(another_personal_message.topic_allowed_users.where(user_id: evil_trout.id).count).to eq(1)
          expect(another_personal_message.topic_allowed_users.where(user_id: regular_user.id).count).to eq(1)
        end

        it "does not allow moving regular topic posts in personal message" do
          expect {
            personal_message.move_posts(admin, [p2.id, p5.id], destination_topic_id: topic.id)
          }.to raise_error(Discourse::InvalidParameters)
        end

        it "moving all posts will close the message" do
          moved_to = personal_message.move_posts(admin, [p1.id, p2.id, p3.id, p4.id, p5.id], destination_topic_id: another_personal_message.id, archetype: "private_message")
          expect(moved_to).to be_present

          personal_message.reload
          expect(personal_message.closed).to eq(true)
          expect(moved_to.posts_count).to eq(6)
        end

        it "uses the correct small action post" do
          moved_to = personal_message.move_posts(admin, [p2.id], destination_topic_id: another_personal_message.id, archetype: "private_message")
          post = Post.find_by(topic_id: personal_message.id, post_type: Post.types[:whisper])

          expected_text = I18n.t(
            "move_posts.existing_message_moderator_post",
            count: 1,
            topic_link: "[#{moved_to.title}](#{p2.reload.url})",
            locale: :en
          )

          expect(post.raw).to eq(expected_text)
        end
      end
    end

    context 'banner topic' do
      fab!(:regular_user) { Fabricate(:trust_level_4) }
      fab!(:topic) { Fabricate(:topic) }
      fab!(:personal_message) { Fabricate(:private_message_topic, user: regular_user) }
      fab!(:banner_topic) { Fabricate(:banner_topic, user: evil_trout) }
      fab!(:p1) { Fabricate(:post, topic: banner_topic, user: evil_trout) }
      fab!(:p2) { Fabricate(:post, topic: banner_topic, reply_to_post_number: p1.post_number, user: regular_user) }

      context 'move to existing topic' do
        it "allows moving banner topic posts in regular topic" do
          banner_topic.move_posts(admin, [p2.id], destination_topic_id: topic.id)
          expect(p2.reload.topic_id).to eq(topic.id)
        end

        it "does not allow moving banner topic posts in personal message" do
          expect {
            banner_topic.move_posts(admin, [p2.id], destination_topic_id: personal_message.id)
          }.to raise_error(Discourse::InvalidParameters)
        end
      end
    end
  end
end