# frozen_string_literal: true

require 'rails_helper'

describe UserDestroyer do

  fab!(:user) { Fabricate(:user_with_secondary_email) }
  fab!(:admin) { Fabricate(:admin) }

  describe 'new' do
    it 'raises an error when user is nil' do
      expect { UserDestroyer.new(nil) }.to raise_error(Discourse::InvalidParameters)
    end

    it 'raises an error when user is not a User' do
      expect { UserDestroyer.new(5) }.to raise_error(Discourse::InvalidParameters)
    end
  end

  describe 'destroy' do
    it 'raises an error when user is nil' do
      expect { UserDestroyer.new(admin).destroy(nil) }.to raise_error(Discourse::InvalidParameters)
    end

    it 'raises an error when user is not a User' do
      expect { UserDestroyer.new(admin).destroy('nothing') }.to raise_error(Discourse::InvalidParameters)
    end

    it 'raises an error when regular user tries to delete another user' do
      expect { UserDestroyer.new(user).destroy(Fabricate(:user)) }.to raise_error(Discourse::InvalidAccess)
    end

    shared_examples "successfully destroy a user" do
      it 'should delete the user' do
        expect { destroy }.to change { User.count }.by(-1)
      end

      it 'should return the deleted user record' do
        return_value = destroy
        expect(return_value).to eq(user)
        expect(return_value).to be_destroyed
      end

      it 'should log the action' do
        StaffActionLogger.any_instance.expects(:log_user_deletion).with(user, anything).once
        destroy
      end

      it "should not log the action if quiet is true" do
        expect {
          UserDestroyer.new(admin).destroy(user, destroy_opts.merge(quiet: true))
        }.to_not change { UserHistory.where(action: UserHistory.actions[:delete_user]).count }
      end

      it 'triggers a extensibility event' do
        event = DiscourseEvent.track_events { destroy }.last

        expect(event[:event_name]).to eq(:user_destroyed)
        expect(event[:params].first).to eq(user)
      end
    end

    shared_examples "email block list" do
      it "doesn't add email to block list by default" do
        ScreenedEmail.expects(:block).never
        destroy
      end

      it "adds emails to block list if block_email is true" do
        expect {
          UserDestroyer.new(admin).destroy(user, destroy_opts.merge(block_email: true))
        }.to change { ScreenedEmail.count }.by(2)
      end
    end

    context 'user deletes self' do
      let(:destroy_opts) { { delete_posts: true, context: "/u/username/preferences/account" } }
      subject(:destroy) { UserDestroyer.new(user).destroy(user, destroy_opts) }

      include_examples "successfully destroy a user"

      it 'should log proper context' do
        destroy
        expect(UserHistory.where(action: UserHistory.actions[:delete_user]).last.context).to eq(I18n.t("staff_action_logs.user_delete_self", url: "/u/username/preferences/account"))
      end
    end

    context 'context is missing' do
      it "logs warning message if context is missing" do
        messages = track_log_messages(level: Logger::WARN) do
          UserDestroyer.new(admin).destroy(user)
        end
        expect(messages[0][2]).to include("User destroyed without context from:")
      end
    end

    context "with a reviewable post" do
      let!(:reviewable) { Fabricate(:reviewable, created_by: user) }

      it "removes the queued post" do
        UserDestroyer.new(admin).destroy(user)
        expect(Reviewable.where(created_by_id: user.id).count).to eq(0)
      end
    end

    context "with a reviewable user" do
      let(:reviewable) { Fabricate(:reviewable, created_by: admin) }

      it 'sets the reviewable user as rejected' do
        UserDestroyer.new(admin).destroy(reviewable.target)

        expect(reviewable.reload.status).to eq(Reviewable.statuses[:rejected])
      end
    end

    context "with a directory item record" do

      it "removes the directory item" do
        DirectoryItem.create!(
          user: user,
          period_type: 1,
          likes_received: 0,
          likes_given: 0,
          topics_entered: 0,
          topic_count: 0,
          post_count: 0
        )
        UserDestroyer.new(admin).destroy(user)
        expect(DirectoryItem.where(user_id: user.id).count).to eq(0)
      end
    end

    context "with a draft" do
      let!(:draft) { Draft.set(user, 'test', 0, 'test') }

      it "removed the draft" do
        UserDestroyer.new(admin).destroy(user)
        expect(Draft.where(user_id: user.id).count).to eq(0)
      end
    end

    context 'user has posts' do
      let!(:topic_starter) { Fabricate(:user) }
      let!(:topic) { Fabricate(:topic, user: topic_starter) }
      let!(:first_post) { Fabricate(:post, user: topic_starter, topic: topic) }
      let!(:post) { Fabricate(:post, user: user, topic: topic) }

      context "delete_posts is false" do
        subject(:destroy) { UserDestroyer.new(admin).destroy(user) }
        before do
          user.stubs(:post_count).returns(1)
          user.stubs(:first_post_created_at).returns(Time.zone.now)
        end

        it 'should raise the right error' do
          StaffActionLogger.any_instance.expects(:log_user_deletion).never
          expect { destroy }.to raise_error(UserDestroyer::PostsExistError)
          expect(user.reload.id).to be_present
        end
      end

      context "delete_posts is true" do
        let(:destroy_opts) { { delete_posts: true } }

        context "staff deletes user" do
          subject(:destroy) { UserDestroyer.new(admin).destroy(user, destroy_opts) }

          include_examples "successfully destroy a user"
          include_examples "email block list"

          it "deletes the posts" do
            destroy
            expect(post.reload.deleted_at).not_to eq(nil)
            expect(post.user_id).to eq(nil)
          end

          it "does not delete topics started by others in which the user has replies" do
            destroy
            expect(topic.reload.deleted_at).to eq(nil)
            expect(topic.user_id).not_to eq(nil)
          end

          it "deletes topics started by the deleted user" do
            spammer_topic = Fabricate(:topic, user: user)
            Fabricate(:post, user: user, topic: spammer_topic)
            destroy
            expect(spammer_topic.reload.deleted_at).not_to eq(nil)
            expect(spammer_topic.user_id).to eq(nil)
          end

          context "delete_as_spammer is true" do

            before { destroy_opts[:delete_as_spammer] = true }

            it "approves reviewable flags" do
              spammer_post = Fabricate(:post, user: user)
              reviewable = PostActionCreator.inappropriate(admin, spammer_post).reviewable
              expect(reviewable).to be_pending

              destroy

              reviewable.reload
              expect(reviewable).to be_approved
            end

          end
        end

        context "users deletes self" do
          subject(:destroy) { UserDestroyer.new(user).destroy(user, destroy_opts) }

          include_examples "successfully destroy a user"
          include_examples "email block list"

          it "deletes the posts" do
            destroy
            expect(post.reload.deleted_at).not_to eq(nil)
            expect(post.user_id).to eq(nil)
          end
        end
      end
    end

    context 'user was invited' do
      it "should delete the invite of user" do
        invite = Fabricate(:invite)
        topic_invite = invite.topic_invites.create!(topic: Fabricate(:topic))
        invited_group = invite.invited_groups.create!(group: Fabricate(:group))
        user = Fabricate(:user)
        user.user_emails.create!(email: invite.email)

        UserDestroyer.new(admin).destroy(user)

        expect(Invite.exists?(invite.id)).to eq(false)
        expect(InvitedGroup.exists?(invited_group.id)).to eq(false)
        expect(TopicInvite.exists?(topic_invite.id)).to eq(false)
      end
    end

    context 'user created category' do
      let!(:topic) { Fabricate(:topic, user: user) }
      let!(:first_post) { Fabricate(:post, user: user, topic: topic) }
      let!(:second_post) { Fabricate(:post, user: user, topic: topic) }
      let!(:category) { Fabricate(:category, user: user, topic_id: topic.id) }

      it 'changes author of first category post to system user and still deletes second post' do
        UserDestroyer.new(admin).destroy(user, delete_posts: true)

        expect(first_post.reload.deleted_at).to eq(nil)
        expect(first_post.user_id).to eq(Discourse.system_user.id)

        expect(second_post.reload.deleted_at).not_to eq(nil)
        expect(second_post.user_id).to eq(nil)
      end
    end

    context 'user has no posts, but user_stats table has post_count > 0' do
      before do
        # out of sync user_stat data shouldn't break UserDestroyer
        user.user_stat.update_attribute(:post_count, 1)
      end
      let(:destroy_opts) { {} }
      subject(:destroy) { UserDestroyer.new(user).destroy(user, delete_posts: false) }

      include_examples "successfully destroy a user"
    end

    context 'user has deleted posts' do
      let!(:deleted_post) { Fabricate(:post, user: user, deleted_at: 1.hour.ago) }
      it "should mark the user's deleted posts as belonging to a nuked user" do
        expect { UserDestroyer.new(admin).destroy(user) }.to change { User.count }.by(-1)
        expect(deleted_post.reload.user_id).to eq(nil)
      end
    end

    context 'user has no posts' do
      context 'and destroy succeeds' do
        let(:destroy_opts) { {} }
        subject(:destroy) { UserDestroyer.new(admin).destroy(user) }

        include_examples "successfully destroy a user"
        include_examples "email block list"
      end

      context 'and destroy fails' do
        subject(:destroy) { UserDestroyer.new(admin).destroy(user) }

        it 'should not log the action' do
          user.stubs(:destroy).returns(false)
          StaffActionLogger.any_instance.expects(:log_user_deletion).never
          destroy
        end
      end
    end

    context 'user has posts with links' do
      context 'external links' do
        before do
          @post = Fabricate(:post_with_external_links, user: user)
          TopicLink.extract_from(@post)
        end

        it "doesn't add ScreenedUrl records by default" do
          ScreenedUrl.expects(:watch).never
          UserDestroyer.new(admin).destroy(user, delete_posts: true)
        end

        it "adds ScreenedUrl records when :block_urls is true" do
          ScreenedUrl.expects(:watch).with(anything, anything, has_key(:ip_address)).at_least_once
          UserDestroyer.new(admin).destroy(user, delete_posts: true, block_urls: true)
        end
      end

      context 'internal links' do
        before do
          @post = Fabricate(:post_with_external_links, user: user)
          TopicLink.extract_from(@post)
          TopicLink.where(user: user).update_all(internal: true)
        end

        it "doesn't add ScreenedUrl records" do
          ScreenedUrl.expects(:watch).never
          UserDestroyer.new(admin).destroy(user, delete_posts: true, block_urls: true)
        end
      end

      context 'with oneboxed links' do
        before do
          @post = Fabricate(:post_with_youtube, user: user)
          TopicLink.extract_from(@post)
        end

        it "doesn't add ScreenedUrl records" do
          ScreenedUrl.expects(:watch).never
          UserDestroyer.new(admin).destroy(user, delete_posts: true, block_urls: true)
        end
      end
    end

    context 'ip address screening' do
      it "doesn't create screened_ip_address records by default" do
        ScreenedIpAddress.expects(:watch).never
        UserDestroyer.new(admin).destroy(user)
      end

      context "block_ip is true" do
        it "creates a new screened_ip_address record" do
          ScreenedIpAddress.expects(:watch).with(user.ip_address).returns(stub_everything)
          UserDestroyer.new(admin).destroy(user, block_ip: true)
        end

        it "creates two new screened_ip_address records when registration_ip_address is different than last ip_address" do
          user.registration_ip_address = '12.12.12.12'
          ScreenedIpAddress.expects(:watch).with(user.ip_address).returns(stub_everything)
          ScreenedIpAddress.expects(:watch).with(user.registration_ip_address).returns(stub_everything)
          UserDestroyer.new(admin).destroy(user, block_ip: true)
        end
      end
    end

    context 'user created a category' do
      let!(:category) { Fabricate(:category_with_definition, user: user) }

      it "assigns the system user to the categories" do
        UserDestroyer.new(admin).destroy(user, delete_posts: true)
        expect(category.reload.user_id).to eq(Discourse.system_user.id)
        expect(category.topic).to be_present
        expect(category.topic.user_id).to eq(Discourse.system_user.id)
      end
    end

    describe "Destroying a user with security key" do
      let!(:security_key) { Fabricate(:user_security_key_with_random_credential, user: user) }

      it "removes the security key" do
        UserDestroyer.new(admin).destroy(user)
        expect(UserSecurityKey.where(user_id: user.id).count).to eq(0)
      end
    end

    describe "Destroying a user with a bookmark" do
      let!(:bookmark) { Fabricate(:bookmark, user: user) }

      it "removes the bookmark" do
        UserDestroyer.new(admin).destroy(user)
        expect(Bookmark.where(user_id: user.id).count).to eq(0)
      end
    end

    context 'user liked things' do
      before do
        @topic = Fabricate(:topic, user: Fabricate(:user))
        @post = Fabricate(:post, user: @topic.user, topic: @topic)
        PostActionCreator.like(user, @post)
      end

      it 'should destroy the like' do
        expect {
          UserDestroyer.new(admin).destroy(user, delete_posts: true)
        }.to change { PostAction.count }.by(-1)
        expect(@post.reload.like_count).to eq(0)
      end
    end

    context 'user belongs to groups that grant trust level' do
      let(:group) { Fabricate(:group, grant_trust_level: 4) }

      before do
        group.add(user)
      end

      it 'can delete the user' do
        d = UserDestroyer.new(admin)
        expect {
          d.destroy(user)
        }.to change { User.count }.by(-1)
      end

      it 'can delete the user if they have a manual locked trust level and have no email' do
        user.update(manual_locked_trust_level: 3)

        UserEmail.where(user: user).delete_all
        user.reload
        expect {
          UserDestroyer.new(admin).destroy(user)
        }.to change { User.count }.by(-1)
      end

      it 'can delete the user if they were to fall into another trust level and have no email' do
        g2 = Fabricate(:group, grant_trust_level: 1)
        g2.add(user)

        UserEmail.where(user: user).delete_all
        user.reload
        expect {
          UserDestroyer.new(admin).destroy(user)
        }.to change { User.count }.by(-1)
      end
    end

    context 'user has staff action logs' do
      before do
        logger = StaffActionLogger.new(user)
        logger.log_site_setting_change(
          'site_description',
          'Our friendly community',
          'My favourite community'
        )
      end

      it "should keep the staff action log and add the username" do
        username = user.username
        log = UserHistory.staff_action_records(
          Discourse.system_user,
          acting_user: username
        ).to_a[0]
        UserDestroyer.new(admin).destroy(user, delete_posts: true)
        log.reload
        expect(log.details).to include(username)
      end
    end

    context 'user got an email' do
      let!(:email_log) { Fabricate(:email_log, user: user) }

      it "does not delete the email log" do
        expect {
          UserDestroyer.new(admin).destroy(user, delete_posts: true)
        }.to_not change { EmailLog.count }
      end
    end
  end

end