# frozen_string_literal: true

require 'rails_helper'

describe TopicViewSerializer do
  def serialize_topic(topic, user_arg)
    topic_view = TopicView.new(topic.id, user_arg)
    serializer = TopicViewSerializer.new(topic_view, scope: Guardian.new(user_arg), root: false).as_json
    JSON.parse(MultiJson.dump(serializer)).deep_symbolize_keys!
  end

  before do
    # ensure no suggested ids are cached cause that can muck up suggested
    RandomTopicSelector.clear_cache!
  end

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

  describe '#featured_link and #featured_link_root_domain' do
    fab!(:featured_link) { 'http://meta.discourse.org' }

    describe 'when topic featured link is disable' do
      it 'should return the right attributes' do
        topic.update!(featured_link: featured_link)
        SiteSetting.topic_featured_link_enabled = false

        json = serialize_topic(topic, user)

        expect(json[:featured_link]).to eq(nil)
        expect(json[:featured_link_root_domain]).to eq(nil)
      end
    end

    describe 'when topic featured link is enabled' do
      it 'should return the right attributes' do
        topic.update!(featured_link: featured_link)

        json = serialize_topic(topic, user)

        expect(json[:featured_link]).to eq(featured_link)
        expect(json[:featured_link_root_domain]).to eq('discourse.org')
      end
    end
  end

  describe '#image_url' do
    fab!(:image_upload) { Fabricate(:image_upload, width: 5000, height: 5000) }

    describe 'when a topic has an image' do
      before { topic.update!(image_upload_id: image_upload.id) }

      it 'should return the image url' do
        json = serialize_topic(topic, user)

        expect(json[:image_url]).to end_with(image_upload.url)
      end

      it 'should have thumbnail jobs enqueued' do
        SiteSetting.create_thumbnails = true

        Discourse.redis.del(topic.thumbnail_job_redis_key(Topic.thumbnail_sizes))
        json = nil

        expect do
          json = serialize_topic(topic, user)
        end.to change { Jobs::GenerateTopicThumbnails.jobs.size }.by(1)

        topic.generate_thumbnails!

        expect do
          json = serialize_topic(topic, user)
        end.to change { Jobs::GenerateTopicThumbnails.jobs.size }.by(0)
      end
    end

    describe 'when a topic does not contain an image' do
      it 'should return a nil image url' do

        json = serialize_topic(topic, user)

        expect(json.has_key? :image_url).to eq(true)
        expect(json[:image_url]).to eq(nil)
      end
    end
  end

  describe '#suggested_topics' do
    fab!(:topic2) { Fabricate(:topic) }

    before do
      TopicUser.update_last_read(user, topic2.id, 0, 0, 0)
    end

    describe 'when loading last chunk' do
      it 'should include suggested topics' do
        json = serialize_topic(topic, user)

        expect(json[:suggested_topics].first[:id]).to eq(topic2.id)
      end
    end

    describe 'when not loading last chunk' do
      fab!(:post) { Fabricate(:post, topic: topic) }
      fab!(:post2) { Fabricate(:post, topic: topic) }

      it 'should not include suggested topics' do
        post
        post2
        topic_view = TopicView.new(topic.id, user, post_ids: [post.id])
        topic_view.next_page
        json = described_class.new(topic_view, scope: Guardian.new(user), root: false).as_json

        expect(json[:suggested_topics]).to eq(nil)
      end
    end

    describe 'with private messages' do
      fab!(:topic) do
        Fabricate(:private_message_topic,
          highest_post_number: 1,
          topic_allowed_users: [
            Fabricate.build(:topic_allowed_user, user: user)
          ]
        )
      end

      fab!(:topic2) do
        Fabricate(:private_message_topic,
          highest_post_number: 1,
          topic_allowed_users: [
            Fabricate.build(:topic_allowed_user, user: user)
          ]
        )
      end

      it 'includes suggested topics' do
        TopicUser.change(user, topic2.id, notification_level: TopicUser.notification_levels[:tracking])

        json = serialize_topic(topic, user)
        expect(json[:suggested_topics].map { |t| t[:id] }).to contain_exactly(topic2.id)
      end

      it 'does not include suggested topics if all PMs are read' do
        TopicUser.update_last_read(user, topic2.id, 1, 1, 0)

        json = serialize_topic(topic, user)
        expect(json[:suggested_topics]).to eq([])
      end
    end
  end

  describe '#suggested_group_name' do
    fab!(:pm) { Fabricate(:private_message_post).topic }
    fab!(:group) { Fabricate(:group) }

    it 'is nil for a regular topic' do
      json = serialize_topic(topic, user)

      expect(json[:suggested_group_name]).to eq(nil)
    end

    it 'is nil if user is an allowed user of the private message' do
      pm.allowed_users << user

      json = serialize_topic(pm, user)

      expect(json[:suggested_group_name]).to eq(nil)
    end

    it 'returns the right group name if user is part of allowed group in the private message' do
      pm.allowed_groups << group
      group.add(user)

      json = serialize_topic(pm, user)

      expect(json[:suggested_group_name]).to eq(group.name)
    end
  end

  describe 'when tags added to private message topics' do
    fab!(:moderator) { Fabricate(:moderator) }
    fab!(:tag) { Fabricate(:tag) }
    fab!(:pm) do
      Fabricate(:private_message_topic, tags: [tag], topic_allowed_users: [
        Fabricate.build(:topic_allowed_user, user: moderator),
        Fabricate.build(:topic_allowed_user, user: user)
      ])
    end

    before do
      SiteSetting.tagging_enabled = true
      SiteSetting.allow_staff_to_tag_pms = true
    end

    it "should not include the tag for normal users" do
      json = serialize_topic(pm, user)
      expect(json[:tags]).to eq(nil)
    end

    it "should include the tag for staff users" do
      [moderator, admin].each do |user|
        json = serialize_topic(pm, user)
        expect(json[:tags]).to eq([tag.name])
      end
    end

    it "should not include the tag if pm tags disabled" do
      SiteSetting.allow_staff_to_tag_pms = false

      [moderator, admin].each do |user|
        json = serialize_topic(pm, user)
        expect(json[:tags]).to eq(nil)
      end
    end
  end

  describe 'with hidden tags' do
    fab!(:hidden_tag) { Fabricate(:tag, name: 'hidden') }
    fab!(:staff_tag_group) { Fabricate(:tag_group, permissions: { "staff" => 1 }, tag_names: [hidden_tag.name]) }

    before do
      topic.tags << hidden_tag
    end

    it 'returns hidden tag to staff' do
      json = serialize_topic(topic, admin)
      expect(json[:tags]).to eq([hidden_tag.name])
    end

    it 'does not return hidden tag to non-staff' do
      json = serialize_topic(topic, user)
      expect(json[:tags]).to eq([])
    end
  end

  describe 'tags order' do
    fab!(:tag1) { Fabricate(:tag, name: 'ctag', description: "c description", topic_count: 5) }
    fab!(:tag2) { Fabricate(:tag, name: 'btag', description: "b description", topic_count: 9) }
    fab!(:tag3) { Fabricate(:tag, name: 'atag', description: "a description", topic_count: 3) }

    before do
      topic.tags << tag1
      topic.tags << tag2
      topic.tags << tag3
    end

    it 'tags are automatically sorted by tag popularity' do
      json = serialize_topic(topic, user)
      expect(json[:tags]).to eq(%w(btag ctag atag))
      expect(json[:tags_descriptions]).to eq({ btag: "b description", ctag: "c description", atag: "a description" })
    end

    it 'tags can be sorted alphabetically' do
      SiteSetting.tags_sort_alphabetically = true
      json = serialize_topic(topic, user)
      expect(json[:tags]).to eq(%w(atag btag ctag))
    end
  end

  context "with flags" do
    fab!(:post) { Fabricate(:post, topic: topic) }
    fab!(:other_post) { Fabricate(:post, topic: topic) }

    it "will return reviewable counts on posts" do
      r = PostActionCreator.inappropriate(Fabricate(:user), post).reviewable
      r.perform(admin, :agree_and_keep)
      PostActionCreator.spam(Fabricate(:user), post)

      json = serialize_topic(topic, admin)
      p0 = json[:post_stream][:posts][0]
      expect(p0[:id]).to eq(post.id)
      expect(p0[:reviewable_score_count]).to eq(2)
      expect(p0[:reviewable_score_pending_count]).to eq(1)

      p1 = json[:post_stream][:posts][1]
      expect(p1[:reviewable_score_count]).to eq(0)
      expect(p1[:reviewable_score_pending_count]).to eq(0)
    end
  end

  describe "pending posts" do
    context "when the queue is enabled" do
      before do
        SiteSetting.approve_post_count = 1
      end

      fab!(:queued_post) do
        ReviewableQueuedPost.needs_review!(
          topic: topic,
          payload: { raw: "hello my raw contents" },
          created_by: user
        )
      end

      it "returns a pending_posts_count when the queue is enabled" do
        json = serialize_topic(topic, admin)
        expect(json[:queued_posts_count]).to eq(1)
      end

      it "returns a user's pending posts" do
        json = serialize_topic(topic, user)
        expect(json[:queued_posts_count]).to be_nil

        post = json[:pending_posts].find { |p| p[:id] = queued_post.id }
        expect(post[:raw]).to eq("hello my raw contents")
        expect(post).to be_present
      end
    end
  end

  context "without an enabled queue" do
    it "returns nil for the count" do
      json = serialize_topic(topic, admin)
      expect(json[:queued_posts_count]).to be_nil
      expect(json[:pending_posts]).to be_nil
    end
  end

  context "details" do
    it "returns the details object" do
      PostCreator.create!(user, topic_id: topic.id, raw: "this is my post content")
      topic.topic_links.create!(user: user, url: 'https://discourse.org', domain: 'discourse.org', clicks: 100)
      json = serialize_topic(topic, admin)

      details = json[:details]
      expect(details).to be_present
      expect(details[:created_by][:id]).to eq(topic.user_id)
      expect(details[:last_poster][:id]).to eq(user.id)
      expect(details[:notification_level]).to be_present
      expect(details[:can_move_posts]).to eq(true)
      expect(details[:can_flag_topic]).to eq(true)
      expect(details[:can_review_topic]).to eq(true)
      expect(details[:links][0][:clicks]).to eq(100)

      participant = details[:participants].find { |p| p[:id] == user.id }
      expect(participant[:post_count]).to eq(1)
    end

    it "returns extra fields for a personal message" do
      group = Fabricate(:group)
      GroupUser.create(group: group, user: user)
      GroupUser.create(group: group, user: admin)

      group2 = Fabricate(:group)
      GroupUser.create(group: group2, user: user)

      pm = Fabricate(:private_message_topic)
      pm.update(archetype: 'private_message')
      pm.topic_allowed_groups.create!(group: group)
      pm.topic_allowed_groups.create!(group: group2)

      json = serialize_topic(pm, admin)

      details = json[:details]
      expect(details[:can_remove_self_id]).to eq(admin.id)
      expect(details[:allowed_users].find { |au| au[:id] == pm.user_id }).to be_present
      expect(details[:allowed_groups].find { |ag| ag[:id] == group.id }).to be_present
    end

    it "has can_publish_page if possible" do
      SiteSetting.enable_page_publishing = true

      json = serialize_topic(topic, user)
      expect(json[:details][:can_publish_page]).to be_blank

      json = serialize_topic(topic, admin)
      expect(json[:details][:can_publish_page]).to eq(true)
    end

    context "can_edit_tags" do
      before do
        SiteSetting.tagging_enabled = true
        SiteSetting.min_trust_to_edit_wiki_post = 2
      end

      it "returns true when user can edit a wiki topic" do
        post = Fabricate(:post, wiki: true)
        topic = Fabricate(:topic, first_post: post)

        json = serialize_topic(topic, user)
        expect(json[:details][:can_edit_tags]).to be_nil

        user.update!(trust_level: 2)

        json = serialize_topic(topic, user)
        expect(json[:details][:can_edit_tags]).to eq(true)
      end
    end

    context "can_edit" do
      fab!(:group_user) { Fabricate(:group_user) }
      fab!(:category) { Fabricate(:category, reviewable_by_group: group_user.group) }
      fab!(:topic) { Fabricate(:topic, category: category) }
      let(:user) { group_user.user }

      before do
        SiteSetting.enable_category_group_moderation = true
      end

      it 'explicitly returns can_edit' do
        json = serialize_topic(topic, user)
        expect(json[:details][:can_edit]).to eq(true)

        topic.update!(category: nil)

        json = serialize_topic(topic, user)
        expect(json[:details][:can_edit]).to eq(false)
      end
    end
  end

  context "published_page" do
    fab!(:published_page) { Fabricate(:published_page, topic: topic) }

    context "page publishing is disabled" do
      before do
        SiteSetting.enable_page_publishing = false
      end

      it "doesn't return the published page if not enabled" do
        json = serialize_topic(topic, admin)
        expect(json[:published_page]).to be_blank
      end
    end

    context "page publishing is enabled" do
      before do
        SiteSetting.enable_page_publishing = true
      end

      context "not staff" do
        it "doesn't return the published page" do
          json = serialize_topic(topic, user)
          expect(json[:published_page]).to be_blank
        end
      end

      context "staff" do
        it "returns the published page" do
          json = serialize_topic(topic, admin)
          expect(json[:published_page]).to be_present
          expect(json[:published_page][:slug]).to eq(published_page.slug)
        end

        context "secure media is enabled" do
          before do
            setup_s3
            SiteSetting.secure_media = true
          end

          it "doesn't return the published page" do
            json = serialize_topic(topic, admin)
            expect(json[:published_page]).to be_blank
          end
        end
      end
    end
  end

  context "viewing private messages when enable_category_group_moderation is enabled" do
    fab!(:pm_topic) do
      Fabricate(:private_message_topic, topic_allowed_users: [
        Fabricate.build(:topic_allowed_user, user: user),
        Fabricate.build(:topic_allowed_user, user: admin)
      ])
    end
    fab!(:post) { Fabricate(:post, topic: pm_topic) }

    before do
      SiteSetting.enable_category_group_moderation = true
    end

    # Ensure having enable_category_group_moderation turned on doesn't break private messages
    it "should return posts" do
      json = serialize_topic(pm_topic, user)
      expect(json[:post_stream][:posts]).to be_present
    end
  end

  describe '#user_last_posted_at' do
    context 'When the slow mode is disabled' do
      it 'returns nil' do
        Fabricate(:topic_user, user: user, topic: topic, last_posted_at: 6.hours.ago)

        json = serialize_topic(topic, user)

        expect(json[:user_last_posted_at]).to be_nil
      end
    end

    context 'When the slow mode is enabled' do
      before { topic.update!(slow_mode_seconds: 1000) }

      it 'returns nil if no user is given' do
        json = serialize_topic(topic, nil)

        expect(json[:user_last_posted_at]).to be_nil
      end

      it "returns nil if there's no topic_user association" do
        json = serialize_topic(topic, user)

        expect(json[:user_last_posted_at]).to be_nil
      end

      it 'returns the last time the user posted' do
        Fabricate(:topic_user, user: user, topic: topic, last_posted_at: 6.hours.ago)
        json = serialize_topic(topic, user)

        expect(json[:user_last_posted_at]).to be_present
      end
    end
  end

  describe '#requested_group_name' do
    fab!(:pm) { Fabricate(:private_message_post).topic }
    fab!(:group) { Fabricate(:group) }

    it 'should return the right group name when PM is a group membership request' do
      pm.custom_fields[:requested_group_id] = group.id
      pm.save!

      user = pm.first_post.user
      group.add_owner(user)
      json = serialize_topic(pm, user)

      expect(json[:requested_group_name]).to eq(group.name)
    end

    it 'should not include the attribute for a non group membership request PM' do
      json = serialize_topic(pm, pm.first_post.user)

      expect(json[:requested_group_name]).to eq(nil)
    end
  end
end