# frozen_string_literal: true

require 'spec_helper'

RSpec.describe Operations::FeatureFlag do
  include FeatureFlagHelpers

  subject { create(:operations_feature_flag) }

  describe 'associations' do
    it { is_expected.to belong_to(:project) }
    it { is_expected.to have_many(:scopes) }
  end

  describe 'validations' do
    it { is_expected.to validate_presence_of(:project) }
    it { is_expected.to validate_presence_of(:name) }
    it { is_expected.to validate_uniqueness_of(:name).scoped_to(:project_id) }
    it { is_expected.to define_enum_for(:version).with_values(legacy_flag: 1, new_version_flag: 2) }

    context 'a version 1 feature flag' do
      it 'is valid if associated with Operations::FeatureFlagScope models' do
        project = create(:project)
        feature_flag = described_class.create({ name: 'test', project: project, version: 1,
                                 scopes_attributes: [{ environment_scope: '*', active: false }] })

        expect(feature_flag).to be_valid
      end

      it 'is invalid if associated with Operations::FeatureFlags::Strategy models' do
        project = create(:project)
        feature_flag = described_class.create({ name: 'test', project: project, version: 1,
                                 strategies_attributes: [{ name: 'default', parameters: {} }] })

        expect(feature_flag.errors.messages).to eq({
          version_associations: ["version 1 feature flags may not have strategies"]
        })
      end
    end

    context 'a version 2 feature flag' do
      it 'is invalid if associated with Operations::FeatureFlagScope models' do
        project = create(:project)
        feature_flag = described_class.create({ name: 'test', project: project, version: 2,
                                 scopes_attributes: [{ environment_scope: '*', active: false }] })

        expect(feature_flag.errors.messages).to eq({
          version_associations: ["version 2 feature flags may not have scopes"]
        })
      end

      it 'is valid if associated with Operations::FeatureFlags::Strategy models' do
        project = create(:project)
        feature_flag = described_class.create({ name: 'test', project: project, version: 2,
                                                strategies_attributes: [{ name: 'default', parameters: {} }] })

        expect(feature_flag).to be_valid
      end
    end

    it_behaves_like 'AtomicInternalId', validate_presence: true do
      let(:internal_id_attribute) { :iid }
      let(:instance) { build(:operations_feature_flag) }
      let(:scope) { :project }
      let(:scope_attrs) { { project: instance.project } }
      let(:usage) { :operations_feature_flags }
    end
  end

  describe 'feature flag version' do
    it 'defaults to 1 if unspecified' do
      project = create(:project)

      feature_flag = described_class.create(name: 'my_flag', project: project, active: true)

      expect(feature_flag).to be_valid
      expect(feature_flag.version_before_type_cast).to eq(1)
    end
  end

  describe 'Scope creation' do
    subject { described_class.new(**params) }

    let(:project) { create(:project) }

    let(:params) do
      { name: 'test', project: project, scopes_attributes: scopes_attributes }
    end

    let(:scopes_attributes) do
      [{ environment_scope: '*', active: false },
       { environment_scope: 'review/*', active: true }]
    end

    it { is_expected.to be_valid }

    context 'when the first scope is not wildcard' do
      let(:scopes_attributes) do
        [{ environment_scope: 'review/*', active: true },
         { environment_scope: '*', active: false }]
      end

      it { is_expected.not_to be_valid }
    end
  end

  describe 'the default scope' do
    let_it_be(:project) { create(:project) }

    context 'with a version 1 feature flag' do
      it 'creates a default scope' do
        feature_flag = described_class.create({ name: 'test', project: project, scopes_attributes: [], version: 1 })

        expect(feature_flag.scopes.count).to eq(1)
        expect(feature_flag.scopes.first.environment_scope).to eq('*')
      end

      it 'allows specifying the default scope in the parameters' do
        feature_flag = described_class.create({ name: 'test', project: project,
                                                scopes_attributes: [{ environment_scope: '*', active: false },
                                                                    { environment_scope: 'review/*', active: true }], version: 1 })

        expect(feature_flag.scopes.count).to eq(2)
        expect(feature_flag.scopes.first.environment_scope).to eq('*')
      end
    end

    context 'with a version 2 feature flag' do
      it 'does not create a default scope' do
        feature_flag = described_class.create({ name: 'test', project: project, scopes_attributes: [], version: 2 })

        expect(feature_flag.scopes).to eq([])
      end
    end
  end

  describe '.enabled' do
    subject { described_class.enabled }

    context 'when the feature flag is active' do
      let!(:feature_flag) { create(:operations_feature_flag, active: true) }

      it 'returns the flag' do
        is_expected.to eq([feature_flag])
      end
    end

    context 'when the feature flag is active and all scopes are inactive' do
      let!(:feature_flag) { create(:operations_feature_flag, active: true) }

      it 'returns the flag' do
        feature_flag.default_scope.update!(active: false)

        is_expected.to eq([feature_flag])
      end
    end

    context 'when the feature flag is inactive' do
      let!(:feature_flag) { create(:operations_feature_flag, active: false) }

      it 'does not return the flag' do
        is_expected.to be_empty
      end
    end

    context 'when the feature flag is inactive and all scopes are active' do
      let!(:feature_flag) { create(:operations_feature_flag, active: false) }

      it 'does not return the flag' do
        feature_flag.default_scope.update!(active: true)

        is_expected.to be_empty
      end
    end
  end

  describe '.disabled' do
    subject { described_class.disabled }

    context 'when the feature flag is active' do
      let!(:feature_flag) { create(:operations_feature_flag, active: true) }

      it 'does not return the flag' do
        is_expected.to be_empty
      end
    end

    context 'when the feature flag is active and all scopes are inactive' do
      let!(:feature_flag) { create(:operations_feature_flag, active: true) }

      it 'does not return the flag' do
        feature_flag.default_scope.update!(active: false)

        is_expected.to be_empty
      end
    end

    context 'when the feature flag is inactive' do
      let!(:feature_flag) { create(:operations_feature_flag, active: false) }

      it 'returns the flag' do
        is_expected.to eq([feature_flag])
      end
    end

    context 'when the feature flag is inactive and all scopes are active' do
      let!(:feature_flag) { create(:operations_feature_flag, active: false) }

      it 'returns the flag' do
        feature_flag.default_scope.update!(active: true)

        is_expected.to eq([feature_flag])
      end
    end
  end

  describe '.for_unleash_client' do
    let_it_be(:project) { create(:project) }
    let!(:feature_flag) do
      create(:operations_feature_flag, project: project,
             name: 'feature1', active: true, version: 2)
    end

    let!(:strategy) do
      create(:operations_strategy, feature_flag: feature_flag,
             name: 'default', parameters: {})
    end

    it 'matches wild cards in the scope' do
      create(:operations_scope, strategy: strategy, environment_scope: 'review/*')

      flags = described_class.for_unleash_client(project, 'review/feature-branch')

      expect(flags).to eq([feature_flag])
    end

    it 'matches wild cards case sensitively' do
      create(:operations_scope, strategy: strategy, environment_scope: 'Staging/*')

      flags = described_class.for_unleash_client(project, 'staging/feature')

      expect(flags).to eq([])
    end

    it 'returns feature flags ordered by id' do
      create(:operations_scope, strategy: strategy, environment_scope: 'production')
      feature_flag_b = create(:operations_feature_flag, project: project,
                              name: 'feature2', active: true, version: 2)
      strategy_b = create(:operations_strategy, feature_flag: feature_flag_b,
                          name: 'default', parameters: {})
      create(:operations_scope, strategy: strategy_b, environment_scope: '*')

      flags = described_class.for_unleash_client(project, 'production')

      expect(flags.map(&:id)).to eq([feature_flag.id, feature_flag_b.id])
    end
  end
end