# frozen_string_literal: true

require 'rspec'

require 'spec_helper'
require 'mime/types'

RSpec.describe Projects::Ml::ExperimentsHelper, feature_category: :mlops do
  let_it_be(:project) { create(:project, :private) }
  let_it_be(:experiment) { create(:ml_experiments, user_id: project.creator, project: project) }
  let_it_be(:pipeline) { create(:ci_pipeline, project: project) }
  let_it_be(:build) { create(:ci_build, pipeline: pipeline) }
  let_it_be(:candidate0) do
    create(:ml_candidates,
      :with_artifact,
      experiment: experiment,
      user: project.creator,
      project: project,
      ci_build: build
    ).tap do |c|
      c.params.build([{ name: 'param1', value: 'p1' }, { name: 'param2', value: 'p2' }])
      c.metrics.create!(
        [{ name: 'metric1', value: 0.1 }, { name: 'metric2', value: 0.2 }, { name: 'metric3', value: 0.3 }]
      )
    end
  end

  let_it_be(:candidate1) do
    create(:ml_candidates, experiment: experiment, user: project.creator, name: 'candidate1',
      project: project).tap do |c|
      c.params.build([{ name: 'param2', value: 'p3' }, { name: 'param3', value: 'p4' }])
      c.metrics.create!(name: 'metric3', value: 0.4)
    end
  end

  let_it_be(:candidates) { [candidate0, candidate1] }

  describe '#candidates_table_items' do
    subject { Gitlab::Json.parse(helper.candidates_table_items(candidates)) }

    it 'creates the correct model for the table', :aggregate_failures do
      expected_values = [
        { 'param1' => 'p1', 'param2' => 'p2', 'metric1' => '0.1000', 'metric2' => '0.2000', 'metric3' => '0.3000',
          'artifact' => "/#{project.full_path}/-/packages/#{candidate0.artifact.id}",
          'details' => "/#{project.full_path}/-/ml/candidates/#{candidate0.iid}",
          'ci_job' => { 'path' => "/#{project.full_path}/-/jobs/#{build.id}", 'name' => 'test' },
          'name' => candidate0.name,
          'created_at' => candidate0.created_at.strftime('%Y-%m-%dT%H:%M:%S.%LZ'),
          'user' => { 'username' => candidate0.user.username, 'path' => "/#{candidate0.user.username}" } },
        { 'param2' => 'p3', 'param3' => 'p4', 'metric3' => '0.4000',
          'artifact' => nil, 'details' => "/#{project.full_path}/-/ml/candidates/#{candidate1.iid}",
          'ci_job' => nil,
          'name' => candidate1.name,
          'created_at' => candidate1.created_at.strftime('%Y-%m-%dT%H:%M:%S.%LZ'),
          'user' => { 'username' => candidate1.user.username, 'path' => "/#{candidate1.user.username}" } }
      ]

      subject.sort_by! { |s| s[:name] }

      expect(subject[0]).to eq(expected_values[0])
      expect(subject[1]).to eq(expected_values[1])
    end

    context 'when candidate does not have user' do
      let(:candidates) { [candidate0] }

      before do
        allow(candidate0).to receive(:user).and_return(nil)
      end

      it 'has the user property, but is nil' do
        expect(subject[0]['user']).to be_nil
      end
    end
  end

  describe '#unique_logged_names' do
    context 'when for params' do
      subject { Gitlab::Json.parse(helper.unique_logged_names(candidates, &:params)) }

      it { is_expected.to match_array(%w[param1 param2 param3]) }
    end

    context 'when latest_metrics is passed' do
      subject { Gitlab::Json.parse(helper.unique_logged_names(candidates, &:latest_metrics)) }

      it { is_expected.to match_array(%w[metric1 metric2 metric3]) }
    end
  end

  describe '#experiment_as_data' do
    subject { Gitlab::Json.parse(helper.experiment_as_data(experiment)) }

    it do
      is_expected.to eq(
        { 'name' => experiment.name, 'path' => "/#{project.full_path}/-/ml/experiments/#{experiment.iid}" }
      )
    end
  end

  describe '#experiments_as_data' do
    let(:experiments) { [experiment] }

    subject { Gitlab::Json.parse(helper.experiments_as_data(project, experiments)) }

    before do
      allow(experiment).to receive(:candidate_count).and_return(2)
    end

    it 'generates the correct info' do
      expected_info = {
        "name" => experiment.name,
        "path" => "/#{project.full_path}/-/ml/experiments/#{experiment.iid}",
        "candidate_count" => 2
      }

      expect(subject[0]).to eq(expected_info)
    end
  end

  describe '#page_info' do
    def paginator(cursor = nil)
      experiment.candidates.keyset_paginate(cursor: cursor, per_page: 1)
    end

    let_it_be(:first_page) { paginator }
    let_it_be(:second_page) { paginator(first_page.cursor_for_next_page) }

    let(:page) { nil }

    subject { helper.page_info(page) }

    context 'when is first page' do
      let(:page) { first_page }

      it 'generates the correct page_info' do
        is_expected.to include({
          has_next_page: true,
          has_previous_page: false,
          start_cursor: nil
        })
      end
    end

    context 'when is last page' do
      let(:page) { second_page }

      it 'generates the correct page_info' do
        is_expected.to include({
          has_next_page:  false,
          has_previous_page: true,
          start_cursor: second_page.cursor_for_previous_page,
          end_cursor: nil
        })
      end
    end
  end

  describe '#formatted_page_info' do
    it 'formats to json' do
      expect(helper.formatted_page_info({ a: 1, b: 'c' })).to eq("{\"a\":1,\"b\":\"c\"}")
    end
  end
end