# frozen_string_literal: true

require 'spec_helper'

describe AlertManagement::Alerts::UpdateService do
  let_it_be(:user_with_permissions) { create(:user) }
  let_it_be(:user_without_permissions) { create(:user) }
  let_it_be(:alert, reload: true) { create(:alert_management_alert) }
  let_it_be(:project) { alert.project }

  let(:current_user) { user_with_permissions }
  let(:params) { {} }

  let(:service) { described_class.new(alert, current_user, params) }

  before_all do
    project.add_developer(user_with_permissions)
  end

  describe '#execute' do
    subject(:response) { service.execute }

    context 'when the current_user is nil' do
      let(:current_user) { nil }

      it 'results in an error' do
        expect(response).to be_error
        expect(response.message).to eq('You have no permissions')
      end
    end

    context 'when user does not have permission to update alerts' do
      let(:current_user) { user_without_permissions }

      it 'results in an error' do
        expect(response).to be_error
        expect(response.message).to eq('You have no permissions')
      end
    end

    context 'when no parameters are included' do
      it 'results in an error' do
        expect(response).to be_error
        expect(response.message).to eq('Please provide attributes to update')
      end
    end

    context 'when an error occures during update' do
      let(:params) { { title: nil } }

      it 'results in an error' do
        expect { response }.not_to change { alert.reload.notes.count }
        expect(response).to be_error
        expect(response.message).to eq("Title can't be blank")
      end
    end

    context 'when a model attribute is included without assignees' do
      let(:params) { { title: 'This is an updated alert.' } }

      it 'updates the attribute' do
        original_title = alert.title

        expect { response }.to change { alert.title }.from(original_title).to(params[:title])
        expect(response).to be_success
      end

      it 'skips adding a todo' do
        expect { response }.not_to change(Todo, :count)
      end
    end

    context 'when assignees are included' do
      let(:params) { { assignees: [user_with_permissions] } }

      after do
        alert.assignees = []
      end

      it 'assigns the user' do
        expect { response }.to change { alert.reload.assignees }.from([]).to(params[:assignees])
        expect(response).to be_success
      end

      it 'creates a system note for the assignment' do
        expect { response }.to change { alert.reload.notes.count }.by(1)
      end

      it 'adds a todo' do
        expect { response }.to change { Todo.where(user: user_with_permissions).count }.by(1)
      end

      context 'when current user is not the assignee' do
        let(:assignee_user) { create(:user) }
        let(:params) { { assignees: [assignee_user] } }

        it 'skips adding todo for assignee without permission to read alert' do
          expect { response }.not_to change(Todo, :count)
        end

        context 'when assignee has read permission' do
          before do
            project.add_developer(assignee_user)
          end

          it 'adds a todo' do
            response

            expect(Todo.first.author).to eq(current_user)
          end
        end

        context 'when current_user is nil' do
          let(:current_user) { nil }

          it 'skips adding todo if current_user is nil' do
            project.add_developer(assignee_user)

            expect { response }.not_to change(Todo, :count)
          end
        end
      end

      context 'with multiple users included' do
        let(:params) { { assignees: [user_with_permissions, user_without_permissions] } }

        it 'assigns the first permissioned user' do
          expect { response }.to change { alert.reload.assignees }.from([]).to([user_with_permissions])
          expect(response).to be_success
        end
      end
    end
  end
end