# frozen_string_literal: true

require 'spec_helper'

RSpec.describe Gitlab::JobWaiter, :redis, feature_category: :shared do
  describe '.notify' do
    let(:key) { described_class.new.key }

    it 'pushes the jid to the named queue', :freeze_time do
      described_class.notify(key, 123)

      Gitlab::Redis::SharedState.with do |redis|
        expect(redis.ttl(key)).to eq(described_class::DEFAULT_TTL)
      end
    end

    it 'can be passed a custom TTL', :freeze_time do
      described_class.notify(key, 123, ttl: 5.minutes)

      Gitlab::Redis::SharedState.with do |redis|
        expect(redis.ttl(key)).to eq(5.minutes.to_i)
      end
    end
  end

  describe '.generate_key' do
    it 'generates and return a new key' do
      key = described_class.generate_key

      expect(key).to include('gitlab:job_waiter:')
    end
  end

  describe '.delete_key' do
    let(:key) { described_class.generate_key }

    it 'deletes the key' do
      described_class.notify(key, '1')
      described_class.delete_key(key)

      Gitlab::Redis::SharedState.with do |redis|
        expect(redis.llen(key)).to eq(0)
      end
    end

    context 'when key is not a JobWaiter key' do
      let(:key) { 'foo' }

      it 'does not delete the key' do
        described_class.notify(key, '1')
        described_class.delete_key(key)

        Gitlab::Redis::SharedState.with do |redis|
          expect(redis.llen(key)).to eq(1)
        end
      end
    end
  end

  describe '#wait' do
    let(:waiter) { described_class.new(2) }

    before do
      allow_any_instance_of(described_class).to receive(:wait).and_call_original
      stub_feature_flags(
        use_primary_and_secondary_stores_for_shared_state: false,
        use_primary_store_as_default_for_shared_state: false
      )
    end

    it 'returns when all jobs have been completed' do
      described_class.notify(waiter.key, 'a')
      described_class.notify(waiter.key, 'b')

      result = nil
      expect { Timeout.timeout(1) { result = waiter.wait(2) } }.not_to raise_error

      expect(result).to contain_exactly('a', 'b')
    end

    it 'times out if not all jobs complete' do
      described_class.notify(waiter.key, 'a')

      result = nil
      expect { Timeout.timeout(2) { result = waiter.wait(1) } }.not_to raise_error

      expect(result).to contain_exactly('a')
    end

    context 'when migration is ongoing' do
      let(:waiter) { described_class.new(3) }

      shared_examples 'returns all jobs' do
        it 'returns all jobs' do
          result = nil
          expect { Timeout.timeout(6) { result = waiter.wait(5) } }.not_to raise_error

          expect(result).to contain_exactly('a', 'b', 'c')
        end
      end

      context 'when using both stores' do
        context 'with existing jobs in old store' do
          before do
            described_class.notify(waiter.key, 'a')
            described_class.notify(waiter.key, 'b')
            described_class.notify(waiter.key, 'c')
            stub_feature_flags(use_primary_and_secondary_stores_for_shared_state: true)
          end

          it_behaves_like 'returns all jobs'
        end

        context 'with jobs in both stores' do
          before do
            stub_feature_flags(use_primary_and_secondary_stores_for_shared_state: true)
            described_class.notify(waiter.key, 'a')
            described_class.notify(waiter.key, 'b')
            described_class.notify(waiter.key, 'c')
          end

          it_behaves_like 'returns all jobs'
        end

        context 'when using primary store as default store' do
          before do
            stub_feature_flags(
              use_primary_and_secondary_stores_for_shared_state: true,
              use_primary_store_as_default_for_shared_state: true
            )
            described_class.notify(waiter.key, 'a')
            described_class.notify(waiter.key, 'b')
            described_class.notify(waiter.key, 'c')
          end

          it_behaves_like 'returns all jobs'
        end
      end
    end
  end
end