# frozen_string_literal: true

require 'spec_helper'

RSpec.describe 'VerifiesWithEmail', :clean_gitlab_redis_sessions, :clean_gitlab_redis_rate_limiting,
  feature_category: :instance_resiliency do
  include SessionHelpers
  include EmailHelpers

  let(:user) { create(:user) }

  shared_examples_for 'send verification instructions' do
    it 'locks the user' do
      user.reload
      expect(user.unlock_token).not_to be_nil
      expect(user.locked_at).not_to be_nil
    end

    it 'sends an email' do
      mail = find_email_for(user)
      expect(mail.to).to match_array([user.email])
      expect(mail.subject).to eq(s_('IdentityVerification|Verify your identity'))
    end

    context 'when an unconfirmed verification email exists' do
      let(:new_email) { 'new@email' }
      let(:user) { create(:user, unconfirmed_email: new_email, confirmation_sent_at: 1.minute.ago) }

      it 'sends a verification instructions email to the unconfirmed email address' do
        mail = ActionMailer::Base.deliveries.find { |d| d.to.include?(new_email) }
        expect(mail.subject).to eq(s_('IdentityVerification|Verify your identity'))
      end
    end
  end

  shared_examples_for 'prompt for email verification' do
    it 'sets the verification_user_id session variable and renders the email verification template' do
      expect(request.session[:verification_user_id]).to eq(user.id)
      expect(response).to have_gitlab_http_status(:ok)
      expect(response).to render_template('devise/sessions/email_verification')
    end
  end

  shared_examples_for 'rate limited' do
    it 'redirects to the login form and shows an alert message' do
      expect(response).to redirect_to(new_user_session_path)
      expect(flash[:alert])
        .to eq(s_('IdentityVerification|Maximum login attempts exceeded. Wait 10 minutes and try again.'))
    end
  end

  shared_examples_for 'two factor prompt or successful login' do
    it 'shows the 2FA prompt when enabled or redirects to the root path' do
      if user.two_factor_enabled?
        expect(response.body).to include('Enter verification code')
      else
        expect(response).to redirect_to(root_path)
      end
    end
  end

  shared_examples_for 'verifying with email' do
    context 'when rate limited' do
      before do
        allow(Gitlab::ApplicationRateLimiter).to receive(:throttled?).and_return(true)
        sign_in
      end

      it_behaves_like 'rate limited'
    end

    context 'when the user already has an unlock_token set' do
      before do
        user.update!(unlock_token: 'token')
        sign_in
      end

      it_behaves_like 'prompt for email verification'
    end

    context 'when the user is already locked' do
      before do
        user.update!(locked_at: Time.current)
        perform_enqueued_jobs { sign_in }
      end

      it_behaves_like 'send verification instructions'
      it_behaves_like 'prompt for email verification'
    end

    context 'when the user is signing in from an unknown ip address' do
      let(:ip_check_enabled) { true }

      before do
        stub_feature_flags(check_ip_address_for_email_verification: ip_check_enabled)
        allow(AuthenticationEvent)
          .to receive(:initial_login_or_known_ip_address?)
          .and_return(false)

        perform_enqueued_jobs { sign_in }
      end

      it_behaves_like 'send verification instructions'
      it_behaves_like 'prompt for email verification'

      context 'when the check_ip_address_for_email_verification feature flag is disabled' do
        let(:ip_check_enabled) { false }

        it_behaves_like 'not verifying with email'
      end
    end
  end

  shared_examples_for 'not verifying with email' do
    context 'when rate limited' do
      before do
        allow(Gitlab::ApplicationRateLimiter).to receive(:throttled?).and_return(true)
        sign_in
      end

      it_behaves_like 'two factor prompt or successful login'
    end

    context 'when the user already has an unlock_token set' do
      before do
        user.update!(unlock_token: 'token')
        sign_in
      end

      it_behaves_like 'two factor prompt or successful login'
    end

    context 'when the user is signing in from an unknown ip address' do
      before do
        allow(AuthenticationEvent)
          .to receive(:initial_login_or_known_ip_address?)
          .and_return(false)
        sign_in
      end

      it_behaves_like 'two factor prompt or successful login'
    end
  end

  describe 'verify_with_email' do
    context 'when user is locked and a verification_user_id session variable exists' do
      before do
        encrypted_token = Devise.token_generator.digest(User, user.email, 'token')
        user.update!(locked_at: Time.current, unlock_token: encrypted_token)
        stub_session(verification_user_id: user.id)
      end

      context 'when rate limited and a verification_token param exists' do
        before do
          allow(Gitlab::ApplicationRateLimiter).to receive(:throttled?).and_return(true)

          post(user_session_path(user: { verification_token: 'token' }))
        end

        it 'adds a verification error message' do
          expect(json_response)
            .to include('message' => "You've reached the maximum amount of tries. "\
                                     'Wait 10 minutes or send a new code and try again.')
        end
      end

      context 'when an invalid verification_token param exists' do
        before do
          post(user_session_path(user: { verification_token: 'invalid_token' }))
        end

        it 'adds a verification error message' do
          expect(json_response)
            .to include('message' => s_('IdentityVerification|The code is incorrect. '\
                                        'Enter it again, or send a new code.'))
        end
      end

      context 'when an expired verification_token param exists' do
        before do
          user.update!(locked_at: 1.hour.ago)
          post(user_session_path(user: { verification_token: 'token' }))
        end

        it 'adds a verification error message' do
          expect(json_response)
            .to include('message' => s_('IdentityVerification|The code has expired. Send a new code and try again.'))
        end
      end

      context 'when a valid verification_token param exists' do
        subject(:submit_token) { post(user_session_path(user: { verification_token: 'token' })) }

        it 'unlocks the user, create logs and records the activity', :freeze_time do
          expect { submit_token }.to change { user.reload.unlock_token }.to(nil)
            .and change { user.locked_at }.to(nil)
            .and change { AuditEvent.count }.by(1)
            .and change { AuthenticationEvent.count }.by(1)
            .and change { user.last_activity_on }.to(Date.today)
            .and change { user.email_reset_offered_at }.to(Time.current)
        end

        it 'returns the success status and a redirect path' do
          submit_token
          expect(json_response).to eq('status' => 'success', 'redirect_path' => users_successful_verification_path)
        end

        context 'when an unconfirmed verification email exists' do
          before do
            user.update!(email: new_email)
          end

          let(:new_email) { 'new@email' }

          it 'confirms the email' do
            expect { submit_token }
              .to change { user.reload.email }.to(new_email)
              .and change { user.confirmed_at }
              .and change { user.unconfirmed_email }.from(new_email).to(nil)
          end
        end

        context 'when email reset has already been offered' do
          before do
            user.update!(email_reset_offered_at: 1.hour.ago, email: 'new@email')
          end

          it 'does not change the email_reset_offered_at field' do
            expect { submit_token }.not_to change { user.reload.email_reset_offered_at }
          end

          it 'does not confirm the email' do
            expect { submit_token }.not_to change { user.reload.email }
          end
        end
      end

      context 'when not completing identity verification and logging in with another account' do
        let(:another_user) { create(:user) }

        before do
          post user_session_path, params: { user: { login: another_user.username, password: another_user.password } }
        end

        it 'redirects to the root path' do
          expect(response).to redirect_to(root_path)
        end
      end
    end

    context 'when signing in with a valid password' do
      let(:headers) { {} }
      let(:sign_in) do
        post user_session_path, params: { user: { login: user.username, password: user.password } }, headers: headers
      end

      it_behaves_like 'not verifying with email'

      context 'when the feature flag is toggled on' do
        before do
          stub_feature_flags(require_email_verification: user)
          stub_feature_flags(skip_require_email_verification: false)
        end

        it_behaves_like 'verifying with email'

        context 'when 2FA is enabled' do
          before do
            user.update!(otp_required_for_login: true)
          end

          it_behaves_like 'not verifying with email'
        end

        context 'when request is not from a QA user' do
          before do
            allow(Gitlab::Qa).to receive(:request?).and_return(false)
          end

          it_behaves_like 'verifying with email'
        end

        context 'when the skip_require_email_verification feature flag is turned on' do
          before do
            stub_feature_flags(skip_require_email_verification: user)
          end

          it_behaves_like 'not verifying with email'
        end
      end
    end
  end

  describe 'resend_verification_code' do
    context 'when no verification_user_id session variable exists' do
      before do
        post(users_resend_verification_code_path)
      end

      it 'returns 204 No Content' do
        expect(response).to have_gitlab_http_status(:no_content)
        expect(response.body).to be_empty
      end
    end

    context 'when a verification_user_id session variable exists' do
      before do
        stub_session(verification_user_id: user.id)

        perform_enqueued_jobs do
          post(users_resend_verification_code_path)
        end
      end

      it_behaves_like 'send verification instructions'
    end

    context 'when exceeding the rate limit' do
      before do
        allow(Gitlab::ApplicationRateLimiter).to receive(:throttled?).and_return(true)

        stub_session(verification_user_id: user.id)

        perform_enqueued_jobs do
          post(users_resend_verification_code_path)
        end
      end

      it 'does not lock the user' do
        user.reload
        expect(user.unlock_token).to be_nil
        expect(user.locked_at).to be_nil
      end

      it 'does not send an email' do
        mail = find_email_for(user)
        expect(mail).to be_nil
      end
    end
  end

  describe 'update_email' do
    let(:new_email) { 'new@email' }

    subject(:do_request) { patch(users_update_email_path(user: { email: new_email })) }

    context 'when no verification_user_id session variable exists' do
      it 'returns 204 No Content' do
        do_request

        expect(response).to have_gitlab_http_status(:no_content)
        expect(response.body).to be_empty
      end
    end

    context 'when a verification_user_id session variable exists' do
      before do
        stub_session(verification_user_id: user.id)
      end

      it 'locks the user' do
        do_request

        expect(user.reload.unlock_token).not_to be_nil
        expect(user.locked_at).not_to be_nil
      end

      it 'sends a changed notification to the primary email and verification instructions to the unconfirmed email' do
        perform_enqueued_jobs { do_request }

        sent_mails = ActionMailer::Base.deliveries.map { |mail| { mail.to[0] => mail.subject } }

        expect(sent_mails).to match_array([
          { user.reload.unconfirmed_email => s_('IdentityVerification|Verify your identity') },
          { user.email => 'Email Changed' }
        ])
      end

      it 'calls the UpdateEmailService and returns a success response' do
        expect_next_instance_of(Users::EmailVerification::UpdateEmailService, user: user) do |instance|
          expect(instance).to receive(:execute).with(email: new_email).and_call_original
        end

        do_request

        expect(json_response).to eq('status' => 'success')
      end
    end

    context 'when failing to update the email address' do
      let(:service_response) do
        {
          status: 'failure',
          reason: 'the reason',
          message: 'the message'
        }
      end

      before do
        stub_session(verification_user_id: user.id)
      end

      it 'calls the UpdateEmailService and returns an error response' do
        expect_next_instance_of(Users::EmailVerification::UpdateEmailService, user: user) do |instance|
          expect(instance).to receive(:execute).with(email: new_email).and_return(service_response)
        end

        do_request

        expect(json_response).to eq(service_response.with_indifferent_access)
      end
    end
  end

  describe 'successful_verification' do
    before do
      allow(user).to receive(:role_required?).and_return(true) # It skips the required signup info before_action
      sign_in(user)
    end

    it 'renders the template and removes the verification_user_id session variable' do
      stub_session(verification_user_id: user.id)

      get(users_successful_verification_path)

      expect(request.session.has_key?(:verification_user_id)).to eq(false)
      expect(response).to have_gitlab_http_status(:ok)
      expect(response).to render_template('successful_verification', layout: 'minimal')
      expect(response.body).to include(root_path)
    end
  end
end