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

RSpec.describe DiscourseChat::Manager do

  let(:manager) {::DiscourseChat::Manager}  
  let(:category) {Fabricate(:category)}
  let(:group) {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 "dummy provider"

    let(:chan1){DiscourseChat::Channel.create!(provider:'dummy')}
    let(:chan2){DiscourseChat::Channel.create!(provider:'dummy')}
    let(:chan3){DiscourseChat::Channel.create!(provider:'dummy')}

    before do
      SiteSetting.chat_integration_enabled = true
    end

    it "should fail gracefully when a provider throws an exception" do
      DiscourseChat::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(DiscourseChat::ProviderError.new info: {error_key:"hello"})
      manager.trigger_notifications(first_post.id)
      expect(provider.sent_to_channel_ids).to contain_exactly()
      expect(DiscourseChat::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(DiscourseChat::Channel.all.first.error_key).to eq('chat_integration.channel_exception')

      provider.set_raise_exception(nil)

      manager.trigger_notifications(first_post.id)
      expect(DiscourseChat::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
      DiscourseChat::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
      DiscourseChat::Rule.create!(channel: chan1, filter: 'watch', category_id:category.id )
      DiscourseChat::Rule.create!(channel: chan2, filter: 'follow', category_id:category.id )
      DiscourseChat::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
      DiscourseChat::Rule.create!(channel: chan1, filter: 'watch', category_id:category.id )
      DiscourseChat::Rule.create!(channel: chan2, filter: 'follow', category_id:category.id )
      DiscourseChat::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
      DiscourseChat::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
      DiscourseChat::Rule.create!(channel: chan1, filter: 'watch', category_id: nil ) # Wildcard watch
      DiscourseChat::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
      DiscourseChat::Rule.create!(channel: chan1, filter: 'follow', category_id: nil ) # Wildcard watch
      DiscourseChat::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 not notify about private messages" do
      DiscourseChat::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
      DiscourseChat::Rule.create!(channel: chan1, filter: 'watch' ) # Wildcard watch
      DiscourseChat::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
      group2 = Fabricate(:group)
      DiscourseChat::Rule.create!(channel: chan1, type: 'group_message', filter: 'watch', group_id: group.id )
      DiscourseChat::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}")

      DiscourseChat::Rule.create!(channel: chan1, filter: 'watch') # Wildcard watch
      DiscourseChat::Rule.create!(channel: chan2, type: 'group_message', filter: 'watch', group_id: group.id)
      DiscourseChat::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 not notify about posts the chat_user cannot see" do
      DiscourseChat::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 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) do
        SiteSetting.tagging_enabled = true
      end

      it 'should still work for rules without any tags specified' do
        DiscourseChat::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
        DiscourseChat::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

    end
  end

end