require File.dirname(__FILE__) + '/../spec_helper'
require 'ladle'

describe OpenProject::LdapGroups::Synchronization, with_ee: %i[ldap_groups] do
  let(:plugin_settings) do
    { group_base: 'ou=groups,dc=example,dc=com', group_key: 'cn' }
  end

  before(:all) do
    ldif = File.expand_path('../../fixtures/users.ldif', __FILE__)
    @ldap_server = Ladle::Server.new(quiet: false, port: '12389', domain: 'dc=example,dc=com', ldif: ldif).start
  end

  after(:all) do
    @ldap_server.stop
  end

  # Ldap has:
  # three users aa729, bb459, cc414
  # two groups foo (aa729), bar(aa729, bb459, cc414)
  let(:auth_source) do
    FactoryBot.create :ldap_auth_source,
                       port: '12389',
                       account: 'uid=admin,ou=system',
                       account_password: 'secret',
                       base_dn: 'ou=people,dc=example,dc=com',
                       attr_login: 'uid'
  end

  let(:user_aa729) { FactoryBot.create :user, login: 'aa729', auth_source: auth_source }
  let(:user_bb459) { FactoryBot.create :user, login: 'bb459', auth_source: auth_source }
  let(:user_cc414) { FactoryBot.create :user, login: 'cc414', auth_source: auth_source }

  let(:group_foo) { FactoryBot.create :group, lastname: 'foo_internal' }
  let(:group_bar) { FactoryBot.create :group, lastname: 'bar' }

  let(:synced_foo) { FactoryBot.create :ldap_synchronized_group, dn: 'cn=foo,ou=groups,dc=example,dc=com', group: group_foo, auth_source: auth_source }
  let(:synced_bar) { FactoryBot.create :ldap_synchronized_group, dn: 'cn=bar,ou=groups,dc=example,dc=com', group: group_bar, auth_source: auth_source }

  subject { described_class.new auth_source }

  shared_examples 'does not change membership count' do
    it 'does not change membership count' do
      subject

      expect(group_foo.users).to be_empty
      expect(group_bar.users).to be_empty

      expect(synced_foo.users).to be_empty
      expect(synced_bar.users).to be_empty
    end
  end

  describe 'adding memberships' do
    context 'when no synced group exists' do
      before do
        user_aa729
        user_bb459
        user_cc414
      end

      it_behaves_like 'does not change membership count'
    end

    context 'when one synced group exists' do
      before do
        group_foo
        synced_foo
      end

      context 'when no users exist' do
        it_behaves_like 'does not change membership count'
      end

      context 'when one mapped user exists' do
        before do
          user_aa729
        end

        it 'synchronized the membership of aa729 to foo' do
          subject
          expect(synced_foo.users.count).to eq(1)
          expect(group_foo.users).to eq([user_aa729])
        end
      end
    end

    context 'when all groups exist' do
      before do
        group_foo
        synced_foo
        group_bar
        synced_bar
      end

      context 'and all users exist' do
        before do
          user_aa729
          user_bb459
          user_cc414
        end


        describe 'synchronizes all memberships' do
          before do
            subject

            expect(synced_foo.users.count).to eq(1)
            expect(synced_bar.users.count).to eq(3)

            expect(group_foo.users).to eq([user_aa729])
            expect(group_bar.users).to eq([user_aa729, user_bb459, user_cc414])
          end

          it 'removes all memberships after removing synced group' do
            synced_foo_id = synced_foo.id
            expect(::LdapGroups::Membership.where(group_id: synced_foo_id).count).to eq(1)
            synced_foo.destroy

            expect { group_foo.reload }.not_to raise_error

            expect(::LdapGroups::Membership.where(group_id: synced_foo_id)).to be_empty
          end

          it 'removes all memberships and groups after removing auth source' do
            expect{ auth_source.destroy }
              .to change{::LdapGroups::Membership.count}.from(4).to(0)

            auth_source.destroy

            expect { synced_foo.reload }.to raise_error ActiveRecord::RecordNotFound
            expect { synced_bar.reload }.to raise_error ActiveRecord::RecordNotFound
          end

          it 'removes all memberships and groups after removing actual group' do
            synced_foo_id = synced_foo.id
            expect(::LdapGroups::Membership.where(group_id: synced_foo_id).count).to eq(1)
            group_foo.destroy

            expect { synced_foo.reload }.to raise_error ActiveRecord::RecordNotFound
            expect(group_bar.users).to eq([user_aa729, user_bb459, user_cc414])

            expect(::LdapGroups::Membership.where(group_id: synced_foo_id)).to be_empty
          end
        end
      end

      context 'and only one user of bar exists' do
        before do
          user_cc414
        end

        it 'synchronized that membership' do
          subject
          expect(synced_foo.users.count).to eq(0)
          expect(synced_bar.users.count).to eq(1)

          expect(group_foo.users).to be_empty
          expect(group_bar.users).to eq([user_cc414])
        end
      end
    end

    context 'foo group exists' do
      before do
        group_foo
        synced_foo
      end

      it 'ignores users that are already in the group' do
        group_foo.users << user_aa729

        # Outputs that nothing was added to sync group
        expect(Rails.logger).to receive(:info).with("[LDAP groups] No users to remove for cn=foo,ou=groups,dc=example,dc=com")
        expect(Rails.logger).to receive(:info).with("[LDAP groups] No new users to add for cn=foo,ou=groups,dc=example,dc=com")

        subject

        # Does not add to synced group since added manually
        expect(synced_foo.users.count).to eq(0)
      end
    end
  end

  describe 'removing memberships' do
    context 'with a user in a group thats not in ldap' do
      before do
        group_foo.users << [user_cc414, user_aa729]
        synced_foo.users.create(user: user_aa729)
        synced_foo.users.create(user: user_cc414)

        subject
      end

      it 'removes the membership' do
        group_foo.reload
        synced_foo.reload

        expect(group_foo.users).to eq([user_aa729])
        expect(synced_foo.users.pluck(:user_id)).to eq([user_aa729.id])
      end
    end
  end

  context 'with invalid connection' do
    let(:auth_source) { FactoryBot.create :ldap_auth_source }

    before do
      synced_foo
    end

    it 'does not raise, but print to stderr' do
      expect(Rails.logger).to receive(:error).with(/Failed to perform LDAP group synchronization/)
      subject
    end
  end

  context 'with invalid base' do
    let(:synced_foo) { FactoryBot.create :ldap_synchronized_group, dn: 'cn=foo,ou=invalid,dc=example,dc=com', group: group_foo, auth_source: auth_source }
    let(:synced_bar) { FactoryBot.create :ldap_synchronized_group, dn: 'cn=bar,ou=invalid,dc=example,dc=com', group: group_bar, auth_source: auth_source }

    context 'when one synced group exists' do
      before do
        group_foo
        synced_foo
        user_aa729
      end

      it 'does not find the group and syncs no user' do
        subject
        expect(synced_foo.users).to be_empty
        expect(group_foo.users).to eq([])
      end
    end
  end
end