# frozen_string_literal: true

require 'rails_helper'

RSpec.describe CreateStats do
  describe '#call' do
    subject(:create_stats) { described_class.new(user_ids).call }

    let(:user_ids) { [user.id] }
    let(:user) { create(:user) }

    context 'when there are no points' do
      it 'does not create stats' do
        expect { create_stats }.not_to(change { Stat.count })
      end
    end

    context 'when there are points' do
      let!(:import) { create(:import, user:) }
      let!(:point1) { create(:point, user:, import:, latitude: 0, longitude: 0) }
      let!(:point2) { create(:point, user:, import:, latitude: 1, longitude: 2) }
      let!(:point3) { create(:point, user:, import:, latitude: 3, longitude: 4) }

      context 'when units are kilometers' do
        before { stub_const('DISTANCE_UNIT', :km) }

        it 'creates stats' do
          expect { create_stats }.to change { Stat.count }.by(1)
        end

        it 'calculates distance' do
          create_stats

          expect(user.stats.last.distance).to eq(563)
        end

        it 'created notifications' do
          expect { create_stats }.to change { Notification.count }.by(1)
        end

        context 'when there is an error' do
          before do
            allow(Stat).to receive(:find_or_initialize_by).and_raise(StandardError)
          end

          it 'does not create stats' do
            expect { create_stats }.not_to(change { Stat.count })
          end

          it 'created notifications' do
            expect { create_stats }.to change { Notification.count }.by(1)
          end
        end
      end

      context 'when units are miles' do
        before { stub_const('DISTANCE_UNIT', :mi) }

        it 'creates stats' do
          expect { create_stats }.to change { Stat.count }.by(1)
        end

        it 'calculates distance' do
          create_stats

          expect(user.stats.last.distance).to eq(349)
        end

        it 'created notifications' do
          expect { create_stats }.to change { Notification.count }.by(1)
        end

        context 'when there is an error' do
          before do
            allow(Stat).to receive(:find_or_initialize_by).and_raise(StandardError)
          end

          it 'does not create stats' do
            expect { create_stats }.not_to(change { Stat.count })
          end

          it 'created notifications' do
            expect { create_stats }.to change { Notification.count }.by(1)
          end
        end
      end
    end
  end
end