# frozen_string_literal: true

require "rails_helper"
require_dependency "post_creator"
require_relative "../dummy_provider"

RSpec.describe DiscourseChatIntegration::Manager do
  let(:manager) { ::DiscourseChatIntegration::Manager }
  let(:category) { Fabricate(:category) }
  let(:group) { Fabricate(:group) }
  let(:group2) { Fabricate(:group) }
  let(:topic) { Fabricate(:topic, category_id: category.id) }
  let(:first_post) { Fabricate(:post, topic: topic) }
  let(:second_post) { Fabricate(:post, topic: topic, post_number: 2) }

  describe ".trigger_notifications" do
    include_context "with dummy provider"

    let(:chan1) { DiscourseChatIntegration::Channel.create!(provider: "dummy") }
    let(:chan2) { DiscourseChatIntegration::Channel.create!(provider: "dummy") }
    let(:chan3) { DiscourseChatIntegration::Channel.create!(provider: "dummy") }

    before { SiteSetting.chat_integration_enabled = true }

    it "should fail gracefully when a provider throws an exception" do
      DiscourseChatIntegration::Rule.create!(
        channel: chan1,
        filter: "watch",
        category_id: category.id,
      )

      # Triggering a ProviderError should set the error_key to the error message
      provider.set_raise_exception(
        DiscourseChatIntegration::ProviderError.new info: { error_key: "hello" }
      )
      manager.trigger_notifications(first_post.id)
      expect(provider.sent_to_channel_ids).to contain_exactly
      expect(DiscourseChatIntegration::Channel.all.first.error_key).to eq("hello")

      # Triggering a different error should set the error_key to a generic message
      provider.set_raise_exception(StandardError.new "hello")
      manager.trigger_notifications(first_post.id)
      expect(provider.sent_to_channel_ids).to contain_exactly
      expect(DiscourseChatIntegration::Channel.all.first.error_key).to eq(
        "chat_integration.channel_exception",
      )

      provider.set_raise_exception(nil)

      manager.trigger_notifications(first_post.id)
      expect(DiscourseChatIntegration::Channel.all.first.error_key.nil?).to be true
    end

    it "should not send notifications when provider is disabled" do
      SiteSetting.chat_integration_enabled = false
      DiscourseChatIntegration::Rule.create!(
        channel: chan1,
        filter: "watch",
        category_id: category.id,
      )

      manager.trigger_notifications(first_post.id)

      expect(provider.sent_to_channel_ids).to contain_exactly
    end

    it "should send a notification to watched and following channels for new topic" do
      DiscourseChatIntegration::Rule.create!(
        channel: chan1,
        filter: "watch",
        category_id: category.id,
      )
      DiscourseChatIntegration::Rule.create!(
        channel: chan2,
        filter: "follow",
        category_id: category.id,
      )
      DiscourseChatIntegration::Rule.create!(
        channel: chan3,
        filter: "mute",
        category_id: category.id,
      )

      manager.trigger_notifications(first_post.id)

      expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id, chan2.id)
    end

    it "should send a notification only to watched for reply" do
      DiscourseChatIntegration::Rule.create!(
        channel: chan1,
        filter: "watch",
        category_id: category.id,
      )
      DiscourseChatIntegration::Rule.create!(
        channel: chan2,
        filter: "follow",
        category_id: category.id,
      )
      DiscourseChatIntegration::Rule.create!(
        channel: chan3,
        filter: "mute",
        category_id: category.id,
      )

      manager.trigger_notifications(second_post.id)

      expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id)
    end

    it "should respect wildcard category settings" do
      DiscourseChatIntegration::Rule.create!(channel: chan1, filter: "watch", category_id: nil)

      manager.trigger_notifications(first_post.id)

      expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id)
    end

    it "should respect mute over watch" do
      DiscourseChatIntegration::Rule.create!(channel: chan1, filter: "watch", category_id: nil) # Wildcard watch
      DiscourseChatIntegration::Rule.create!(
        channel: chan1,
        filter: "mute",
        category_id: category.id,
      ) # Specific mute

      manager.trigger_notifications(first_post.id)

      expect(provider.sent_to_channel_ids).to contain_exactly
    end

    it "should respect watch over follow" do
      DiscourseChatIntegration::Rule.create!(channel: chan1, filter: "follow", category_id: nil) # Wildcard follow
      DiscourseChatIntegration::Rule.create!(
        channel: chan1,
        filter: "watch",
        category_id: category.id,
      ) # Specific watch

      manager.trigger_notifications(second_post.id)

      expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id)
    end

    it "should respect thread over watch" do
      DiscourseChatIntegration::Rule.create!(channel: chan1, filter: "watch", category_id: nil) # Wildcard watch
      DiscourseChatIntegration::Rule.create!(
        channel: chan1,
        filter: "thread",
        category_id: category.id,
      ) # Specific thread

      manager.trigger_notifications(second_post.id)

      expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id)
    end

    it "should not notify about private messages" do
      DiscourseChatIntegration::Rule.create!(channel: chan1, filter: "follow", category_id: nil) # Wildcard watch

      private_post = Fabricate(:private_message_post)

      manager.trigger_notifications(private_post.id)

      expect(provider.sent_to_channel_ids).to contain_exactly
    end

    it "should work for group pms" do
      DiscourseChatIntegration::Rule.create!(channel: chan1, filter: "watch") # Wildcard watch
      DiscourseChatIntegration::Rule.create!(
        channel: chan2,
        type: "group_message",
        filter: "watch",
        group_id: group.id,
      ) # Group watch

      private_post = Fabricate(:private_message_post)
      private_post.topic.invite_group(Fabricate(:user), group)

      manager.trigger_notifications(private_post.id)

      expect(provider.sent_to_channel_ids).to contain_exactly(chan2.id)
    end

    it "should work for pms with multiple groups" do
      DiscourseChatIntegration::Rule.create!(
        channel: chan1,
        type: "group_message",
        filter: "watch",
        group_id: group.id,
      )
      DiscourseChatIntegration::Rule.create!(
        channel: chan2,
        type: "group_message",
        filter: "watch",
        group_id: group2.id,
      )

      private_post = Fabricate(:private_message_post)
      private_post.topic.invite_group(Fabricate(:user), group)
      private_post.topic.invite_group(Fabricate(:user), group2)

      manager.trigger_notifications(private_post.id)

      expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id, chan2.id)
    end

    it "should work for group mentions" do
      third_post =
        Fabricate(:post, topic: topic, post_number: 3, raw: "let's mention @#{group.name}")

      DiscourseChatIntegration::Rule.create!(channel: chan1, filter: "watch") # Wildcard watch
      DiscourseChatIntegration::Rule.create!(
        channel: chan2,
        type: "group_message",
        filter: "watch",
        group_id: group.id,
      )
      DiscourseChatIntegration::Rule.create!(
        channel: chan3,
        type: "group_mention",
        filter: "watch",
        group_id: group.id,
      )

      manager.trigger_notifications(third_post.id)
      expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id, chan3.id)
    end

    it "should give group rule precedence over normal rules" do
      third_post =
        Fabricate(:post, topic: topic, post_number: 3, raw: "let's mention @#{group.name}")

      DiscourseChatIntegration::Rule.create!(
        channel: chan1,
        filter: "mute",
        category_id: category.id,
      ) # Mute category
      manager.trigger_notifications(third_post.id)
      expect(provider.sent_to_channel_ids).to contain_exactly

      DiscourseChatIntegration::Rule.create!(
        channel: chan1,
        filter: "watch",
        type: "group_mention",
        group_id: group.id,
      ) # Watch mentions
      manager.trigger_notifications(third_post.id)
      expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id)
    end

    it "should not notify about mentions in private messages" do
      # Group 1 watching for messages on channel 1
      DiscourseChatIntegration::Rule.create!(
        channel: chan1,
        filter: "watch",
        type: "group_message",
        group_id: group.id,
      )
      # Group 2 watching for mentions on channel 2
      DiscourseChatIntegration::Rule.create!(
        channel: chan2,
        filter: "watch",
        type: "group_mention",
        group_id: group2.id,
      )

      # Make a private message only accessible to group 1
      private_message = Fabricate(:private_message_post)
      private_message.topic.invite_group(Fabricate(:user), group)

      # Mention group 2 in the message
      mention_post =
        Fabricate(
          :post,
          topic: private_message.topic,
          post_number: 2,
          raw: "let's mention @#{group2.name}",
        )

      # We expect that only group 1 receives a notification
      manager.trigger_notifications(mention_post.id)
      expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id)
    end

    it "should not notify about posts the chat_user cannot see" do
      DiscourseChatIntegration::Rule.create!(channel: chan1, filter: "follow", category_id: nil) # Wildcard watch

      # Create a group & user
      group = Fabricate(:group, name: "friends")
      user = Fabricate(:user, username: "david")
      group.add(user)

      # Set the chat_user to the newly created non-admin user
      SiteSetting.chat_integration_discourse_username = "david"

      # Create a category
      category = Fabricate(:category, name: "Test category")
      topic.category = category
      topic.save!

      # Restrict category to admins only
      category.set_permissions(Group[:admins] => :full)
      category.save!

      # Check no notification sent
      manager.trigger_notifications(first_post.id)
      expect(provider.sent_to_channel_ids).to contain_exactly

      # Now expose category to new user
      category.set_permissions(Group[:friends] => :full)
      category.save!

      # Check notification sent
      manager.trigger_notifications(first_post.id)
      expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id)
    end

    describe "With `create_post_for_category_and_tag_changes` enabled" do
      before(:each) { SiteSetting.create_post_for_category_and_tag_changes = true }

      let(:admin) { Fabricate(:admin) }
      let(:other_topic) { Fabricate(:topic) }
      let(:other_topic_post) { Fabricate(:post, topic: topic) }

      it "should trigger follow rules for specific categories when topic category changes" do
        DiscourseChatIntegration::Rule.create!(
          channel: chan1,
          filter: "follow",
          category_id: category.id,
        )

        PostRevisor.new(other_topic_post).revise!(admin, category_id: category.id)

        manager.trigger_notifications(topic.ordered_posts.last.id)

        expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id)
      end

      it "shouldn't trigger follow rules with wildcard category match" do
        DiscourseChatIntegration::Rule.create!(channel: chan1, filter: "follow", category_id: nil)

        PostRevisor.new(other_topic_post).revise!(admin, category_id: category.id)

        manager.trigger_notifications(topic.ordered_posts.last.id)

        expect(provider.sent_to_channel_ids).to contain_exactly
      end
    end

    describe "with tags enabled" do
      let(:tag) { Fabricate(:tag, name: "gsoc") }
      let(:tagged_topic) { Fabricate(:topic, category_id: category.id, tags: [tag]) }
      let(:tagged_first_post) { Fabricate(:post, topic: tagged_topic) }

      before(:each) { SiteSetting.tagging_enabled = true }

      it "should still work for rules without any tags specified" do
        DiscourseChatIntegration::Rule.create!(channel: chan1, filter: "follow", category_id: nil) # Wildcard watch

        manager.trigger_notifications(first_post.id)
        manager.trigger_notifications(tagged_first_post.id)

        expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id, chan1.id)
      end

      it "should only match tagged topics when rule has tags" do
        DiscourseChatIntegration::Rule.create!(
          channel: chan1,
          filter: "follow",
          category_id: category.id,
          tags: [tag.name],
        )

        manager.trigger_notifications(first_post.id)
        manager.trigger_notifications(tagged_first_post.id)

        expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id)
      end

      describe "with create_small_action_post_for_tag_changes enabled" do
        fab!(:admin) { Fabricate(:admin) }
        fab!(:additional_tag) { Fabricate(:tag) }

        before { SiteSetting.create_post_for_category_and_tag_changes = true }

        def set_new_tags_and_return_small_action_post(tags)
          PostRevisor.new(tagged_first_post).revise!(admin, tags: tags)

          tagged_topic.ordered_posts.last
        end

        it "should notify when rule is set up for tag additions for a category with no tag filter" do
          post = set_new_tags_and_return_small_action_post([tag.name, additional_tag.name])

          DiscourseChatIntegration::Rule.create!(
            channel: chan1,
            filter: "tag_added",
            category_id: category.id,
          )

          manager.trigger_notifications(post.id)
          expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id)
        end

        it "notifies when topic has a tag added that matches the rule" do
          post = set_new_tags_and_return_small_action_post([tag.name, additional_tag.name])

          DiscourseChatIntegration::Rule.create!(
            channel: chan1,
            filter: "tag_added",
            category_id: category.id,
            tags: [additional_tag.name],
          )

          manager.trigger_notifications(post.id)
          expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id)
        end

        it "doesn't notify when topic has an unchanged tag present in the rule, even if a new tag is added" do
          post = set_new_tags_and_return_small_action_post([tag.name, additional_tag.name])

          DiscourseChatIntegration::Rule.create!(
            channel: chan1,
            filter: "tag_added",
            category_id: category.id,
            tags: [tag.name],
          )

          manager.trigger_notifications(post.id)
          expect(provider.sent_to_channel_ids).to contain_exactly
        end

        it "doesn't notify for small action 'tags_changed' posts unless a matching rule exists" do
          post = set_new_tags_and_return_small_action_post([additional_tag.name])

          DiscourseChatIntegration::Rule.create!(channel: chan1, filter: "watch", category_id: nil) # Wildcard watch

          manager.trigger_notifications(post.id)
          expect(provider.sent_to_channel_ids).to contain_exactly
        end
      end
    end
  end
end