# frozen_string_literal: true

require 'spec_helper'

RSpec.describe BlobViewer::MetricsDashboardYml do
  include FakeBlobHelpers
  include RepoHelpers

  let_it_be(:project) { create(:project, :repository) }
  let(:blob) { fake_blob(path: '.gitlab/dashboards/custom-dashboard.yml', data: data) }
  let(:sha) { sample_commit.id }

  subject(:viewer) { described_class.new(blob) }

  context 'when the definition is valid' do
    let(:data) { fixture_file('lib/gitlab/metrics/dashboard/sample_dashboard.yml')}

    describe '#valid?' do
      it 'calls prepare! on the viewer' do
        allow(Gitlab::Metrics::Dashboard::Validator).to receive(:errors)

        expect(viewer).to receive(:prepare!)

        viewer.valid?
      end

      it 'returns true', :aggregate_failures do
        yml = ::Gitlab::Config::Loader::Yaml.new(data).load_raw!

        expect_next_instance_of(::Gitlab::Config::Loader::Yaml, data) do |loader|
          expect(loader).to receive(:load_raw!).and_call_original
        end
        expect(Gitlab::Metrics::Dashboard::Validator)
          .to receive(:errors)
          .with(yml, dashboard_path: '.gitlab/dashboards/custom-dashboard.yml', project: project)
          .and_call_original
        expect(viewer.valid?).to be_truthy
      end
    end

    describe '#errors' do
      it 'returns empty array' do
        allow(Gitlab::Metrics::Dashboard::Validator).to receive(:errors).and_return([])

        expect(viewer.errors).to eq []
      end
    end
  end

  context 'when definition is invalid' do
    let(:error) { ::Gitlab::Metrics::Dashboard::Validator::Errors::SchemaValidationError.new }
    let(:data) do
      <<~YAML
        dashboard:
      YAML
    end

    before do
      allow(Gitlab::Metrics::Dashboard::Validator).to receive(:errors).and_return([error])
    end

    describe '#valid?' do
      it 'returns false' do
        expect(viewer.valid?).to be false
      end
    end

    describe '#errors' do
      it 'returns validation errors' do
        expect(viewer.errors).to eq [error]
      end
    end
  end

  context 'when YAML syntax is invalid' do
    let(:data) do
      <<~YAML
        dashboard: 'empty metrics'
         panel_groups:
        - group: 'Group Title'
      YAML
    end

    describe '#valid?' do
      it 'returns false' do
        expect(Gitlab::Metrics::Dashboard::Validator).not_to receive(:errors)
        expect(viewer.valid?).to be false
      end
    end

    describe '#errors' do
      it 'returns validation errors' do
        expect(viewer.errors).to all be_kind_of Gitlab::Config::Loader::FormatError
      end
    end
  end

  context 'when YAML loader raises error' do
    let(:data) do
      <<~YAML
        large yaml file
      YAML
    end

    before do
      allow(::Gitlab::Config::Loader::Yaml).to receive(:new)
        .and_raise(::Gitlab::Config::Loader::Yaml::DataTooLargeError, 'The parsed YAML is too big')
    end

    it 'is invalid' do
      expect(Gitlab::Metrics::Dashboard::Validator).not_to receive(:errors)
      expect(viewer.valid?).to be false
    end

    it 'returns validation errors' do
      expect(viewer.errors).to all be_kind_of Gitlab::Config::Loader::FormatError
    end
  end
end